Electric tool

Abstract

An electric tool, comprising a motor housing (12), a handle housing (11), an elastic member (9), and a connecting assembly (8). The motor housing is used for accommodating a motor, one end of the motor housing is provided with a plurality of assembling portions (121) extending in the direction perpendicular to the axis of the motor, and at least two assembling portions are disposed on two sides of the axis of the motor; the handle housing extends along the axis of the motor housing, one end of the handle housing is connected to the assembling portions, the handle housing comprises two handle covers (110), and the two handle covers are provided with abutting portions (111) connected to the assembling portions; the elastic member is located between the abutting portions and the assembling portions; and the connecting assembly passes through the abutting portions, the assembling portions and the elastic member, and locks the elastic member between the abutting portions and the assembling portions. The electric tool is of a straight-handle-type structure, and the elastic member can evenly bear, from multiple directions, vibration generated during operation of the electric tool, reducing the impact caused by vibration and prolonging the service life of the electric tool. Also provided is a printed circuit board for the electric tool.

Description

power tools

[0001] This application claims priority to the following patent applications:

[0002] A Chinese patent application entitled "Electric Tools" was filed with the Chinese Patent Office on May 10, 2024, with application number 202421012344.X.

[0003] A Chinese patent application entitled "Electric Wrench" was filed with the Chinese Patent Office on November 13, 2024, with application number 202411615993.3.

[0004] A Chinese patent application entitled "Impact Tool" was filed with the Chinese Patent Office on November 13, 2024, with application number 202422769120.X.

[0005] A Chinese patent application entitled "Electric Wrench" was filed with the Chinese Patent Office on November 13, 2024, with application number 202422772668.X.

[0006] A Chinese patent application entitled "Electric Wrench" was filed with the Chinese Patent Office on December 10, 2024, with application number 202423050347.5.

[0007] A Chinese patent application, filed on December 10, 2024, with application number 202423050525.4 and patent title "Electric Tools";

[0008] A Chinese patent application, filed with the Chinese Patent Office on November 29, 2024, with application number 202422933543.0 and patent title "Electric Tools";

[0009] A Chinese patent application was filed with the Chinese Patent Office on February 28, 2025, with application number 202520339153.2 and patent title "Printed Circuit Board for Power Tools and Power Tools";

[0010] The entire contents of the aforementioned patent application are incorporated herein by reference. Technical Field

[0011] This application relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0012] Commonly used power tools include electric drills, hammer drills, impact drills, electric screwdrivers, and electric wrenches. During use, power tools generate significant vibrations due to considerable resistance, affecting the operator's performance.

[0013] Currently, there are methods to connect elastic elements between the drive housing and the handle to reduce the impact of vibration. However, due to the structure of the power tool itself and the connection position of the elastic elements, the vibration reduction effect is generally limited.

[0014] This application content

[0015] In view of this, the present application provides an electric tool to solve at least one problem existing in the background art.

[0016] In a first aspect, embodiments of this application provide an electric tool, the electric tool comprising:

[0017] A motor housing for housing a motor, wherein one end of the motor housing is provided with a plurality of assembly parts extending in a direction perpendicular to the motor axis, and at least two of the assembly parts are provided on both sides of the motor axis;

[0018] A handle housing extends along the axis of the motor housing, one end of the handle housing is connected to the assembly part, and the other end is a free end for the operator to grip. The handle housing includes two handle covers that cover the assembly part, and the two handle covers have abutting portions that are connected to the assembly part.

[0019] An elastic element is located between the abutting portion and the assembly portion;

[0020] A connecting component extends through the abutment, the assembly, and the elastic member, and locks the elastic member between the abutment and the assembly.

[0021] In conjunction with the first aspect of this application, in an optional embodiment, the handle housing includes a second half-shell and a first half-shell, the second half-shell and the first half-shell respectively forming two handle covers;

[0022] The elastic element includes a first elastic element and a second elastic element. The first elastic element is connected between the second half-shell and the assembly part, and the second elastic element is connected between the first half-shell and the assembly part.

[0023] In conjunction with the first aspect of this application, in an optional embodiment, the assembly part is provided with a first mounting post, the second half-shell is provided with a second mounting post, the first half-shell is provided with a third mounting post, and the connecting component simultaneously matches the first mounting post, the second mounting post, and the third mounting post, so that the second half-shell is connected to the first half-shell to the motor housing.

[0024] In conjunction with the first aspect of this application, in an alternative embodiment, the second mounting post is connected to the third mounting post.

[0025] In conjunction with the first aspect of this application, in an optional embodiment, the first elastic element is a first elastic ring, the first elastic ring is sleeved on the second mounting post, and the first elastic ring abuts between the assembly part, the second mounting post and the second half shell;

[0026] The second elastic element is a second elastic ring, which is sleeved on the third mounting post and abuts against the assembly part, the third mounting post and the first half shell.

[0027] In conjunction with the first aspect of this application, in an alternative embodiment, the second mounting post and the third mounting post are spaced apart.

[0028] In conjunction with the first aspect of this application, in an optional embodiment, the first elastic element is a third elastic ring, the third elastic ring being sleeved on the connecting assembly and the second mounting post, and the third elastic ring abutting between the assembly portion, the connecting assembly, the second mounting post and the second half-shell;

[0029] The second elastic element is a fourth elastic ring, which is sleeved on the connecting assembly and the third mounting post, and abuts against the assembly part, the connecting assembly, the third mounting post and the first half-shell.

[0030] In conjunction with the first aspect of this application, in an optional embodiment, the fourth elastic ring is provided with a first ring and a second ring, the first ring being connected to the second ring, the inner diameter of the first ring matching the outer diameter of the connecting component, and the inner diameter of the second ring matching the outer diameter of the third mounting post.

[0031] In conjunction with the first aspect of this application, in an optional embodiment, the first half-shell is further provided with a first receiving groove for receiving the second ring, the outer diameter of the second ring matching the first receiving groove.

[0032] In conjunction with the first aspect of this application, in an optional embodiment, the assembly part is provided with a second receiving groove for receiving the first ring, the outer diameter of the first ring being matched with the second receiving groove, and the second receiving groove forming the assembly part.

[0033] Compared with the prior art, the first aspect of this application provides an electric tool in which the handle is located in the extension direction of the motor axis, i.e., the electric tool has a straight handle structure. The motor housing is provided with a plurality of assembly parts extending in a direction perpendicular to the motor axis, and at least two assembly parts are located on both sides of the motor axis. Elastic members are installed in the assembly parts so that the elastic members can evenly distribute the vibration generated during the operation of the electric tool from multiple directions, thereby improving the operator's operating stability and comfort, and increasing the service life of the electric tool.

[0034] Power tools mainly consist of a motor, a reduction gear, and an impact mechanism. The reduction gear and the motor are placed separately. The reduction gear is located inside the gearbox, while the motor is located inside the motor housing. The rotor shaft of the motor passes through the gearbox and is engaged with the reduction gear in a transmission manner. The reduction gear is usually a planetary gear, which is used to reduce the high-speed rotation generated by the motor in order to output greater torque.

[0035] To reduce wear on the reduction gear mechanism, lubricating grease is applied during assembly and filled into the gearbox housing it. During operation, some of this lubricating grease leaks from the gearbox. Some of it seeps into the motor housing through the gap between the motor's rotor shaft and the gearbox, accelerating the loss of lubricating grease and contaminating the motor. Furthermore, the significant vibrations generated by power tools during operation can cause hand numbness and negatively impact the user experience.

[0036] Based on this, in a second aspect, this application provides an electric tool, the electric tool comprising:

[0037] An electric motor, which includes a rotor shaft;

[0038] A power mechanism, including a transmission assembly, which includes a planetary carrier;

[0039] A gearbox for housing the transmission assembly and having a through hole; the motor is located outside the gearbox, and the rotor shaft passes through the through hole to engage with the input end of the transmission assembly.

[0040] The front bearing includes an outer bearing ring and an inner bearing ring, the outer bearing ring being sealed to the gearbox, and the inner bearing ring being fitted around the outer periphery of the front end of the rotor shaft;

[0041] An auxiliary support bearing is located in front of the front bearing and connected to the planetary carrier. The auxiliary support bearing is sleeved on the rotor shaft with a clearance fit between the two.

[0042] A shock-absorbing sealing sleeve is located between the front bearing and the auxiliary support bearing, and is fitted onto the rotor shaft with an interference fit. The rear end of the shock-absorbing sealing sleeve abuts against the front bearing to seal the assembly gap between the bearing inner ring and the rotor shaft.

[0043] When the power tool is in operation, the power mechanism and the motor will move back and forth.

[0044] During the forward and backward movement of the power mechanism, the auxiliary support bearing can move back and forth with the transmission assembly and squeeze the shock-absorbing sealing sleeve, and the shock-absorbing sealing sleeve absorbs part of the rearward impact force generated by the power mechanism.

[0045] During the forward and backward movement of the motor, the shock-absorbing sealing sleeve can press against the auxiliary support bearing as the rotor shaft moves back and forth, and the shock-absorbing sealing sleeve absorbs part of the forward impact force generated by the motor.

[0046] In conjunction with a second aspect of this application, in an optional embodiment, when the power tool is in its initial state, a gap is left between the front end of the shock-absorbing sealing sleeve and the auxiliary support bearing;

[0047] The clearance is configured such that, during operation of the power tool, the auxiliary support bearing and the shock-absorbing seal can collide and press against each other.

[0048] In conjunction with a second aspect of this application, in an optional embodiment, the gap is less than 2 mm in the front-to-back direction.

[0049] In conjunction with a second aspect of this application, in an optional embodiment, the shock-absorbing sealing sleeve includes a protrusion and a recess, the protrusion and the recess being distributed sequentially in the front-rear direction.

[0050] In conjunction with a second aspect of this application, in an optional embodiment, the number of at least one of the protrusions and the recesses is greater than or equal to two, and the protrusions and the recesses are alternately distributed in the front-back direction.

[0051] In conjunction with a second aspect of this application, in an optional embodiment, the power mechanism includes a main shaft, and the output end of the planetary carrier is driven by the main shaft.

[0052] In conjunction with a second aspect of this application, in an alternative embodiment, the spindle and the planetary carrier are integrally formed.

[0053] In conjunction with the second aspect of this application, in an optional embodiment, the rear sidewall of the gearbox is provided with a mounting groove, the through hole penetrates the mounting groove, the mounting groove is provided with a retaining groove for engaging a sealing ring, and the outer ring of the bearing is engaged in the mounting groove.

[0054] In conjunction with a second aspect of this application, in an alternative embodiment, the rear end of the shock-absorbing sealing sleeve extends into the through hole and the two are clearance-fitted.

[0055] In conjunction with the second aspect of this application, in an optional embodiment, the planetary carrier is provided with a sleeve hole, and the auxiliary support bearing is engaged in the sleeve hole with an interference fit between the two.

[0056] And / or, the shock-absorbing sealing sleeve is a rubber component.

[0057] Compared with the prior art, the power tool provided in the second aspect of this application has an auxiliary support bearing in front of the front bearing to provide auxiliary support for the front end of the rotor shaft, reducing the deformation amplitude of the front part of the rotor shaft or preventing deformation, and ensuring the smooth operation of the whole machine. A shock-absorbing sealing sleeve is provided between the front bearing and the auxiliary support bearing to seal the assembly of the bearing inner ring and the rotor shaft, preventing the lubricating grease in the gearbox from leaking into the motor. Furthermore, the auxiliary support bearing and the shock-absorbing sealing sleeve are limited to move back and forth with the power mechanism, and they can also move back and forth with the rotor shaft. In this way, when the power tool is started, the shock-absorbing sealing sleeve and the auxiliary support bearing can be squeezed, thereby providing shock absorption for both the motor and the power mechanism, reducing the vibration during the operation of the whole machine, and improving the user experience.

[0058] Power tools, including impact wrenches and impact screwdrivers, are widely used in various fields of industrial manufacturing. Power tools have high power and generate significant vibration when in use.

[0059] For power tools with handles located behind the motor, the vibrations they generate can cause the bearing housing on the machine casing, which supports the motor bearings, to deform or even fail, thus preventing the motor from being effectively supported.

[0060] Based on this, in a third aspect, this application provides an electric tool, the electric tool comprising:

[0061] An electric motor, which includes a rotor shaft;

[0062] A rear bearing, which is fitted onto the rear part of the rotor shaft;

[0063] The motor housing is cylindrical to house the motor. A bearing chamber is formed on one side of the bottom wall of the motor housing, which houses the rear bearing. A first connecting structure is provided on the other side of the bottom wall.

[0064] The handle housing has a grip portion and a second connecting structure;

[0065] An elastic element is provided, wherein the first connecting structure is connected to the second connecting structure through the elastic element, and the elastic element is clamped.

[0066] In conjunction with a third aspect of this application, in an optional embodiment, the power tool further includes a connecting component, wherein the first connecting structure has a first mounting hole and the second connecting structure has a second mounting hole; the connecting component mates with the first mounting hole and the second mounting hole to connect the first connecting structure and the second connecting structure; the axis of the connecting component is perpendicular to the axis of the motor.

[0067] In conjunction with a third aspect of this application, in an alternative embodiment, the elastic element is sleeved around the outer periphery of the connecting assembly and the two are interference-fitted.

[0068] In conjunction with the third aspect of this application, in an optional embodiment, the second connecting structure includes a cylindrical portion and an annular extension portion, the second mounting hole is provided on the cylindrical portion, the annular extension portion is disposed around the cylindrical portion and an annular groove is formed between the two, and the elastic member includes a second ring and a connecting portion connected in sequence in the radial direction of the motor;

[0069] The second ring engages with the annular groove to provide axial vibration damping for the handle housing; the outer end face of the second ring abuts against the bottom wall of the annular groove along the radial direction of the motor, and the connecting portion abuts against the end of the column portion along the radial direction of the motor to provide radial vibration damping for the handle housing.

[0070] In conjunction with a third aspect of this application, in an optional embodiment, the inner wall of the second ring is provided with a first concave-convex surface, which abuts against the outer wall of the column portion in the axial direction of the motor.

[0071] In conjunction with a third aspect of this application, in an optional embodiment, the first uneven surface has a serrated structure.

[0072] In conjunction with a third aspect of this application, in an optional embodiment, the elastic element includes a connecting portion and a first ring sequentially connected in the radial direction of the motor, the first connecting structure being provided with a groove;

[0073] The first ring engages with the groove to provide axial shock absorption for the handle housing; the outer end face of the first ring abuts against the bottom wall of the groove along the radial direction of the motor, and the connecting part abuts against the outer end face of the elastic member along the radial direction of the motor to provide radial shock absorption for the handle housing.

[0074] In conjunction with a third aspect of this application, in an optional embodiment, the outer wall of the first ring is provided with a second concave-convex surface, the second concave-convex surface abutting against the groove wall of the groove in the axial direction of the motor.

[0075] In conjunction with a third aspect of this application, in an optional embodiment, the second uneven surface has a serrated structure.

[0076] In conjunction with a third aspect of this application, in an optional embodiment, the handle housing includes a second half-shell and a first half-shell, wherein the second half-shell and the first half-shell are respectively provided with a second connecting structure;

[0077] The second connecting structure of the second half-shell, an elastic element, the first connecting structure, another elastic element, and the second connecting structure of the first half-shell are distributed in sequence along the radial direction of the motor and locked together by the connecting assembly.

[0078] Compared with the prior art, the power tool provided in the third aspect of this application has a bearing chamber on the inner wall of the motor housing and a first connecting structure on the outer wall of the motor housing opposite to the bearing chamber. An elastic element is provided between the first connecting structure and the second connecting structure of the handle housing to form a shock-absorbing mechanism. On the one hand, the setting of the first connecting structure can increase the thickness of the motor housing at the bearing chamber to a certain extent. On the other hand, when the power tool is working, the elastic element can reduce the vibration transmitted from the first connecting structure to the second connecting structure along the radial direction of the motor, reduce the damage of vibration to the motor housing, improve the structural strength of the motor housing at the bearing chamber, and ensure that the motor is effectively supported.

[0079] Power tools are used to tighten and loosen bolts and nuts. Some current power tools use single-stage planetary gears to reduce the speed of the motor rotor, typically employing an NGW gear system. This system has a small gear ratio range, and the motor rotor shaft is supported by two bearings, a front bearing and a rear bearing. The axial distance between the sun gear and the front bearing in an NGW gear system is small, resulting in smoother transmission. In contrast, NW gear systems offer higher transmission efficiency and a wider gear ratio range, but their axial dimensions are larger. If used in power tools, this would increase the axial distance between the front bearing and the sun gear in an NW gear system, leading to unstable transmission.

[0080] Based on this, in a fourth aspect, this application provides an electric tool, wherein the output torque of the electric tool is greater than or equal to 2000 N·m, and the electric tool includes:

[0081] An electric motor, which includes a rotor shaft;

[0082] The transmission assembly includes planetary gears, an internal gear ring, a planet carrier, and a sun gear formed at the front end of the rotor shaft;

[0083] The front bearing and the rear bearing are respectively fitted onto the outer circumference of the rotor shaft and are located on the front and rear sides of the main body housing of the motor.

[0084] An auxiliary support bearing is sleeved on the outer circumference of the rotor shaft and located between the sun gear and the front bearing;

[0085] A gearbox for housing the transmission assembly, wherein the maximum distance between the central axis of the gearbox and its outer wall is less than or equal to 60 mm.

[0086] In conjunction with the fourth aspect of this application, in an optional embodiment, one end of the planetary carrier is provided with an axially extending cavity and a radially extending first mounting groove, the planetary gear is mounted in the first mounting groove, and the front end of the rotor shaft is inserted into the cavity and meshes with the planetary gear.

[0087] In conjunction with the fourth aspect of this application, in an alternative embodiment, the auxiliary support bearing is mounted on the planetary carrier.

[0088] In conjunction with the fourth aspect of this application, in an alternative embodiment, the auxiliary support bearing is installed within the cavity.

[0089] In conjunction with the fourth aspect of this application, in an optional embodiment, the cavity wall of the recess is provided with a boss, and the auxiliary support bearing axially abuts against the boss.

[0090] In conjunction with a fourth aspect of this application, in an alternative embodiment, the boss is located between the first mounting groove and the auxiliary support bearing.

[0091] In conjunction with the fourth aspect of this application, in an alternative embodiment, the boss is annular.

[0092] In conjunction with the fourth aspect of this application, in an optional embodiment, the rear end of the gearbox is provided with a second mounting groove, and the front bearing is mounted in the second mounting groove.

[0093] In conjunction with the fourth aspect of this application, in an optional embodiment, the rear end surface of the gearbox is provided with an annular protrusion, and the annular protrusion forms the second mounting groove between the rear end surface of the gearbox and the rear end surface of the gearbox.

[0094] In conjunction with the fourth aspect of this application, in an alternative embodiment, the axial dimension of the auxiliary support bearing is smaller than the axial dimension of the front bearing.

[0095] Compared with the prior art, the power tool provided in the fourth aspect of this application uses a transmission component to increase the output torque, making the output torque of the power tool greater than or equal to 2000 N·m. Furthermore, the transmission component has a smaller radial dimension than the NGW gear system, thus enabling the maximum distance between the central axis of the gearbox and its outer wall to be less than or equal to 60 mm, which is beneficial for miniaturizing the radial dimension of the power tool. Simultaneously, the power tool adds an auxiliary support bearing, which supports the rotor shaft between the sun gear and the front bearing, reducing the deformation amplitude of the front of the rotor shaft or preventing deformation. This avoids unstable meshing of the sun gear and planetary gears, preventing the power tool from failing to operate smoothly under harsh conditions, thus ensuring stable operation of the entire machine.

[0096] Power tools are tools for tightening and loosening bolts and nuts. Current power tools use a single-stage planetary gear train to reduce the speed of the motor rotor. The overall diameter of power tools is relatively large, which is not conducive to working in confined spaces.

[0097] Based on this, in a fifth aspect, this application provides an electric tool, the electric tool comprising:

[0098] case;

[0099] An electric motor, which is disposed within the housing and has a rotor shaft;

[0100] The transmission assembly includes a first-stage planetary gear train and a second-stage planetary gear train, wherein the rotor shaft, the first-stage planetary gear train, and the second-stage planetary gear train are sequentially coupled in transmission.

[0101] Wherein, the outer diameter of the transmission assembly is ≤70mm, the length of the transmission assembly is ≤50mm, the transmission assembly is configured to provide a total reduction ratio of at least 13:1, and the maximum tightening torque of the power tool is at least 1500N·m.

[0102] In conjunction with the fifth aspect of this application, in an optional embodiment, the power tool further includes an impact assembly, a spindle, and an output shaft located in front of the spindle. The impact assembly includes an impact block, a spring, and a first ball bearing. The impact block is sleeved on the outer periphery of the spindle. The spindle is engaged with a second-stage planetary gear train. The spindle drives the output shaft to move through the impact assembly. The outer diameter of the impact block is ≤77mm.

[0103] In conjunction with the fifth aspect of this application, in an alternative embodiment, the outer diameter of the housing is ≤105mm.

[0104] In conjunction with the fifth aspect of this application, in an optional embodiment, the first-stage planetary gear train includes a first sun gear, a plurality of first planetary gears, a first internal gear ring, and a first planet carrier. The first sun gear is disposed at the end of the rotor shaft, the first internal gear ring is mounted on the inner wall of the housing, and the first planetary gears are mounted on the first planet carrier and mesh with the first sun gear and the first internal gear ring, respectively.

[0105] In conjunction with the fifth aspect of this application, in an optional embodiment, the second-stage planetary gear train includes a second sun gear, a plurality of second planetary gears, a second internal gear ring, and a second planetary carrier. The second sun gear is integrally formed on the first planetary carrier, the second internal gear ring is mounted on the inner wall of the housing, and the second planetary gears are mounted on the second planetary carrier and mesh with the second sun gear and the second internal gear ring, respectively.

[0106] In conjunction with the fifth aspect of this application, in an alternative embodiment, the power tool includes a spindle, with the second planetary carrier integrally formed at the end of the spindle.

[0107] In conjunction with the fifth aspect of this application, in an optional embodiment, the second internal gear ring abuts against the front end face of the first internal gear ring.

[0108] In conjunction with the fifth aspect of this application, in an optional embodiment, the first planetary carrier includes a main body and a plurality of first planetary pins, the first planetary gears are mounted one by one on the first planetary pins, and the second sun gear is located on the side of the main body away from the first planetary pins; the two ends of the main body extend into the first internal gear ring and the second internal gear ring, respectively.

[0109] In conjunction with the fifth aspect of this application, in an optional embodiment, a needle roller bearing is provided between the first planetary gear and the first planetary pin.

[0110] In conjunction with the fifth aspect of this application, in an alternative embodiment, the second planetary carrier is mounted to the inner wall of the housing via rolling bearings.

[0111] Compared with the prior art, the power tool provided in the fifth aspect of this application adopts a two-stage planetary gear train, which can ensure that the maximum tightening torque of the power tool is at least 1500 N·m, while also controlling the outer diameter of the transmission component to within 70 mm and the length of the transmission component to within 50 mm. This ensures high torque output while also facilitating the miniaturization design of the power tool.

[0112] Power tools (such as electric wrenches and electric screwdrivers) are tools for tightening and loosening bolts and nuts. They typically use a single-stage planetary gear train to reduce the speed of the motor rotor. If a two-stage planetary gear train is used, the first-stage planetary gear train is assembled first, followed by the second-stage planetary gear train, and the internal gear ring and planetary gears are installed first, followed by the planet carrier. However, aligning the planetary gears with the planetary pins on the planet carrier is difficult and affects assembly efficiency.

[0113] Based on this, in a sixth aspect, this application provides an electric tool, the electric tool comprising:

[0114] The housing includes a head housing, a gearbox, a gearbox rear cover, and a motor housing connected sequentially from front to back;

[0115] An electric motor, which is located within the motor housing and includes a rotor shaft;

[0116] A transmission assembly, comprising a first-stage planetary gear train and a second-stage planetary gear train in a transmission engagement, wherein the rotor shaft is in a transmission engagement with the first-stage planetary gear train;

[0117] An impact assembly, located within the head shell;

[0118] The gearbox has open structures at both the front and rear ends, the transmission assembly is located inside the gearbox, and the rear cover of the gearbox is installed over the rear open end of the gearbox.

[0119] In conjunction with the sixth aspect of this application, in an alternative embodiment, the power tool includes a fastening screw, and the head housing, gearbox, gearbox rear cover and motor housing are sequentially connected by the fastening screw.

[0120] In conjunction with the sixth aspect of this application, in an optional embodiment, the head shell includes a first connecting hole, the gearbox includes a second connecting hole, the gearbox rear cover includes a third connecting hole, and the motor housing includes a fourth connecting hole;

[0121] The fastening screws pass through the first connecting hole, the second connecting hole, the third connecting hole, and the fourth connecting hole in sequence to make connections.

[0122] In conjunction with the sixth aspect of this application, in an optional embodiment, the outer wall of the head shell is provided with a first protrusion, the gearbox includes a main body and a gear mounting cavity surrounded by the main body, the gearbox rear cover includes a cover body and an extension surrounding the cover body, and the outer wall of the motor housing is provided with a second protrusion; the first protrusion, the main body, the extension and the second protrusion abut against each other in sequence and are connected by the fastening screw.

[0123] In conjunction with the sixth aspect of this application, in an optional embodiment, the first protrusion, the main body, the extension, and the second protrusion have the same circumferential outer contour shape.

[0124] In conjunction with the sixth aspect of this application, in an optional embodiment, the first-stage planetary gear train includes a first internal gear ring, and the second-stage planetary gear train includes a second internal gear ring;

[0125] The first internal gear ring and the second internal gear ring are engaged in the gear mounting cavity.

[0126] In conjunction with the sixth aspect of this application, in an optional embodiment, the rear end face of the head shell is provided with a first annular protrusion, and the front end face of the gearbox is provided with a first annular groove, wherein the first annular protrusion is inserted into the first annular groove.

[0127] In conjunction with the sixth aspect of this application, in an optional embodiment, the rear end face of the gearbox is provided with a second annular protrusion, and the front end face of the gearbox rear cover is recessed to form a cavity, wherein the second annular protrusion is engaged with the cavity.

[0128] In conjunction with the sixth aspect of this application, in an optional embodiment, the outer wall of the second annular protrusion is provided with an annular groove, and a sealing ring is engaged in the annular groove to seal the assembly gap between the second annular protrusion and the gearbox rear cover.

[0129] In conjunction with the sixth aspect of this application, in an alternative embodiment, the power tool includes a front bearing for supporting the front portion of the rotor shaft;

[0130] The rear end face of the gearbox cover is provided with a second annular groove, and the front bearing is engaged with the second annular groove.

[0131] Compared with the prior art, the power tool provided in the sixth aspect of this application improves the structure of the housing by setting the gearbox structure as a split structure in which the gearbox and the gearbox rear cover are two parts that cooperate. In this way, during assembly, the second-stage planetary gear train is first installed from the rear opening of the gearbox, and then the first-stage planetary gear train is installed from the rear opening of the gearbox, and then the gearbox rear cover is installed. In this way, when assembling the corresponding planetary gear train, the planet carrier is installed first and then the planetary gears are installed. The planetary gears can be easily fitted onto the planetary pins of the planet carrier, which facilitates assembly and improves assembly efficiency.

[0132] Power tools are widely used in various fields of industrial manufacturing. Power tools generate significant vibrations during operation, especially impact tools, which have a large impact force. The vibration is transmitted to the user's arm through the handle, which can cause numbness and fatigue in the user's arm. Long-term use can also easily cause damage to the user's arm.

[0133] Based on this, in a seventh aspect, this application provides an electric tool, the electric tool comprising:

[0134] The tool body includes a housing and an output shaft connected to the housing, the housing being provided with a first mounting portion;

[0135] An auxiliary handle is located on the radial side of the output shaft and includes a handle portion and an attachment portion, the attachment portion being provided with a second mounting portion;

[0136] The mounting component passes through the second mounting portion and the first mounting portion to mount the auxiliary handle onto the housing;

[0137] The first damping component has a first damping part and a second damping part;

[0138] The second damping component has a third damping part and a fourth damping part;

[0139] In this embodiment, at least one of the mounting components is fitted with the first shock absorber and the second shock absorber. The first shock absorber and the third shock absorber are respectively sandwiched between the hole wall of the second mounting component and the mounting component. The second shock absorber is sandwiched between the outer wall of the attachment component and the mounting component. The fourth shock absorber is sandwiched between the outer wall of the attachment component and the housing.

[0140] In conjunction with the seventh aspect of this application, in an alternative embodiment, the mounting element is a fastener, and / or, both the first damping element and the second damping element are rubber rings.

[0141] In conjunction with the seventh aspect of this application, in an optional embodiment, the mounting member includes a connected end cap and a mounting rod, the mounting rod passing through the second mounting portion and the first mounting portion, the end cap being located on the side of the attachment portion away from the housing, and the second shock-absorbing portion being sandwiched between the outer wall of the attachment portion and the end cap.

[0142] In conjunction with the seventh aspect of this application, in an optional embodiment, a buffer pad is provided between the end cap and the second shock-absorbing part, and the buffer pad is sleeved on the outer periphery of the mounting rod.

[0143] In conjunction with the seventh aspect of this application, in an optional embodiment, the housing includes a protruding structure, the first mounting portion is disposed on the protruding structure, and the fourth shock-absorbing portion is sandwiched between the outer wall of the attachment portion and the protruding structure.

[0144] In conjunction with the seventh aspect of this application, in an optional embodiment, the direction in which the second damping part is clamped and the direction in which the fourth damping part is clamped are both perpendicular to the central axis of the output shaft.

[0145] In conjunction with the seventh aspect of this application, in an optional embodiment, the number of the first mounting part, the second mounting part, and the mounting component is at least two, and the three are matched one-to-one;

[0146] The first damping component and the second damping component constitute a set of damping components, and each of the mounting components is matched with a set of damping components.

[0147] In conjunction with the seventh aspect of this application, in an alternative embodiment, the auxiliary handle is annular, the handle portion and the attachment portion are spaced apart in a direction toward the housing, and the handle portion extends radially along the output shaft.

[0148] In conjunction with the seventh aspect of this application, in an optional embodiment, the auxiliary handle further includes two transition portions, and the two ends of the handle portion are respectively connected to the two ends of the attachment portion through the two transition portions;

[0149] The transition portion extends forward or backward so that the handle portion is offset from the middle part of the attachment portion.

[0150] In conjunction with the seventh aspect of this application, in an alternative embodiment, the housing includes a motor housing and an output housing connected sequentially in a forward direction, and the tool body further includes a motor and a transmission assembly that are engaged in transmission.

[0151] The motor is located in the motor housing, the transmission assembly is located in the output housing, and the first mounting part is disposed on the output housing.

[0152] Compared with the prior art, the power tool provided in the seventh aspect of this application has a first shock absorber and a second shock absorber fitted on a mounting member for connecting the auxiliary handle and the housing, and optimizes the assembly relationship between the first shock absorber, the second shock absorber, the attachment part, the mounting member and the housing. The first shock absorber and the second shock absorber separate the mounting member from the attachment part of the auxiliary handle, which can dampen the auxiliary handle in the axial and radial directions of the output shaft, effectively reducing the vibration transmitted from the auxiliary handle to the user's arm.

[0153] Power tools use an electric motor as a power source. The motor consists of a stator and a mover. The stator is electrically connected to a switch (such as a field-effect transistor) on a printed circuit board through stator terminals. The printed circuit board supplies power to the motor through the switch.

[0154] To prevent overheating of printed circuit boards (PCBs) from affecting their lifespan, PCBs are usually equipped with heat sinks, and insulating components are placed between the heat sinks and the PCB body. When the heat sink is squeezed, the squeezing force is transmitted to the PCB body through the insulating components. The PCB body is prone to bending, and switches (such as field-effect transistors) mounted on the PCB body are also prone to stress and detachment.

[0155] Based on this, in an eighth aspect, this application provides a printed circuit board for power tools, the printed circuit board comprising:

[0156] PCB board;

[0157] A heat sink, which is connected to the PCB board;

[0158] Multiple switches are electrically connected to the PCB board and to the heat sink. The switches are used to control the start and stop of the motor of the power tool.

[0159] A plastic support is located between the PCB board and the heat sink, the plastic support being used to support the heat sink and to insulate and separate the PCB board from the heat sink.

[0160] In conjunction with the eighth aspect of this application, in an alternative embodiment, the switch is connected to the heat sink via a first fastener.

[0161] In conjunction with the eighth aspect of this application, in an alternative embodiment, the heat sink includes a first side arm and a second side arm disposed opposite to each other, with a portion of the switch connected to the first side arm and a portion of the switch connected to the second side arm.

[0162] In conjunction with the eighth aspect of this application, in an optional embodiment, the plastic support includes a first support arm, a connecting arm, and a second support arm connected in sequence, and the heat sink is supported on the first support arm and the second support arm.

[0163] In conjunction with the eighth aspect of this application, in an optional embodiment, the heat sink includes a first leg and a second leg, the first leg being supported on the first support arm and the second leg being supported on the second support arm.

[0164] In conjunction with the eighth aspect of this application, in an optional embodiment, the first leg, the first support arm, and the PCB board are connected by a second fastener, and the second leg, the second support arm, and the PCB board are connected by a third fastener.

[0165] In conjunction with the eighth aspect of this application, in an optional embodiment, the heat sink includes:

[0166] The first side arm, part of the switch is connected to the first side arm;

[0167] The second side arm, part of the switch is connected to the second side arm;

[0168] A connecting rib is located between the first side arm and the second side arm, and is connected to the first side arm and the second side arm.

[0169] An extension arm is connected to the connecting rib and extends along the length of the first side arm, and part of the switch is connected to the extension arm.

[0170] In conjunction with the eighth aspect of this application, in an optional embodiment, a plurality of first heat dissipation fins are provided on the inner surface wall of the first side arm, the first heat dissipation fins extending in a direction toward the second side arm and away from the PCB board body;

[0171] And / or, a plurality of second heat dissipation fins are provided on the inner wall surface of the second side arm, and the second heat dissipation fins extend in a direction toward the first side arm and away from the PCB board body;

[0172] And / or, the connecting rib is arranged parallel to the PCB board body, the connecting rib is provided with a plurality of third heat dissipation fins, and the third heat dissipation fins extend in a direction perpendicular to the PCB board body.

[0173] In conjunction with the eighth aspect of this application, in an alternative embodiment, the plastic support is U-shaped, C-shaped, V-shaped, or W-shaped;

[0174] And / or, the plastic support is of nylon structure;

[0175] And / or, the plastic support member has a cutout on the side facing the PCB board;

[0176] And / or, the PCB board body and the plastic support are engaged by positioning protrusions and positioning holes to achieve positioning pre-assembly;

[0177] And / or, the switch is connected to the PCB board via pins;

[0178] And / or, the printed circuit board further includes a base, the PCB body is mounted in the base, and the PCB body, the switch and the plastic support are all located in the base;

[0179] And / or, the switch is selected from any one of a field-effect transistor, a bipolar junction transistor, an insulated gate bipolar transistor, a gate turn-off thyristor, a MOS-controlled thyristor, an integrated gate commutated thyristor, and an electron-injected enhancement gate transistor.

[0180] In addition, this application also provides a power tool, the power tool comprising:

[0181] case;

[0182] The motor is located within the housing;

[0183] As described above, the printed circuit board for power tools controls the start and stop of the motor via the switch.

[0184] Compared with the prior art, the printed circuit board provided in the eighth aspect of this application provides a plastic support between the PCB board and the heat sink. The plastic support serves as insulation to prevent short circuits. Furthermore, the plastic support supports the heat sink. If the heat sink is deformed due to compression, the plastic support is not easily deformed and can absorb stress, thus preventing the PCB board from bending due to the deformation of the heat sink. In addition, the heat sink also provides support for the switch, reducing the stress on the switch and preventing the switch from falling off due to vibration or compression.

[0185] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0186] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0187] Figure 1 is a schematic diagram of the overall structure of the electric wrench provided in the embodiment of this application;

[0188] Figure 2 is an exploded view of the structure of the power tool provided in the embodiment of this application;

[0189] Figure 3 is an exploded perspective view of the power tool provided in the embodiment of this application;

[0190] Figure 4a is a schematic diagram of the overall structure of the power tool provided in the embodiment of this application from another angle;

[0191] Figure 4b is a cross-sectional view at point AA in Figure 4a;

[0192] Figure 4c is a cross-sectional view of a power tool provided in another embodiment of this application;

[0193] Figure 5 is a schematic diagram of the structure of the first half-shell in a power tool provided in another embodiment of this application;

[0194] Figure 6 is a schematic diagram of the structure of the fourth elastic ring in the power tool provided in the embodiment of this application;

[0195] Figure 7 is an enlarged view of point A in Figure 3;

[0196] Figure 8 is a structural cross-sectional view of the power tool of this application;

[0197] Figure 9 is an enlarged view of section B in Figure 8;

[0198] Figure 10 is a partial exploded view of the power tool of this application;

[0199] Figure 11 is a three-dimensional structural diagram of the shock-absorbing sealing sleeve of this application;

[0200] Figure 12 is a three-dimensional structural diagram of the gearbox of this application;

[0201] Figure 13 is a partial structural schematic diagram of the power mechanism of this application;

[0202] Figure 14 is a structural cross-sectional view of the power tool of this application;

[0203] Figure 15 is a partial structural cross-sectional view of the power tool of this application;

[0204] Figure 16 is an enlarged view of point C in Figure 15;

[0205] Figure 17 is a partial exploded view of the power tool of this application;

[0206] Figure 18 is a three-dimensional structural diagram of the first half-shell of this application;

[0207] Figure 19 is a three-dimensional structural diagram of the elastic element of this application;

[0208] Figure 20 is a cross-sectional view of the power tool of this application;

[0209] Figure 21 is an enlarged view of point D in Figure 20;

[0210] Figure 22 is a partial exploded view of the power tool of this application;

[0211] Figure 23 is a cross-sectional view of the power tool of this application;

[0212] Figure 24 is an enlarged view of point E in Figure 23;

[0213] Figure 25 is a partial exploded view of the power tool of this application;

[0214] Figure 26 is a cross-sectional view of the power tool of this application.

[0215] Figure 27 is a cross-sectional view of the power tool of this application (Figure 2).

[0216] Figure 28 is an enlarged view of point F in Figure 27;

[0217] Figure 29 is an exploded view of the assembly structure of the housing, fastening screws and fastening nuts of this application;

[0218] Figure 30 is a partial exploded view of the power tool of this application;

[0219] Figure 31 is a three-dimensional structural diagram of the gearbox of this application;

[0220] Figure 32 is a three-dimensional structural diagram of the power tool of this application;

[0221] Figure 33 is a cross-sectional view of the power tool of this application;

[0222] Figure 34 is an enlarged view of point G in Figure 33;

[0223] Figure 35 is an exploded view of the structure of the power tool of this application;

[0224] Figure 36 is a three-dimensional structural diagram of the auxiliary handle of this application;

[0225] Figure 37 is a three-dimensional structural diagram of the power tool of this application;

[0226] Figure 38 is a three-dimensional structural diagram of the printed circuit board of this application;

[0227] Figure 39 is a top view of the printed circuit board of this application;

[0228] Figure 40 is a cross-sectional view of the printed circuit board of this application;

[0229] Figure 41 is an exploded view of the printed circuit board structure of this application;

[0230] Figure 42 is a three-dimensional structural diagram of the plastic support component of this application. Detailed Implementation

[0231] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the disclosure of the present application to those skilled in the art.

[0232] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0233] In the accompanying drawings, for clarity, the dimensions of layers, areas, and elements, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0234] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0235] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0236] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0237] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0238] The power tools provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0239] Specifically, as shown in Figures 1 and 2, this application provides an electric tool that includes a motor housing 12, a handle housing 11, a connecting assembly 8, and an elastic element 9.

[0240] The motor housing 12 is used to house the motor (not shown in the figure). One end of the motor housing 12 is provided with a plurality of assembly parts 121 extending in a direction perpendicular to the motor axis, and at least two assembly parts 121 are provided on both sides of the motor axis. At least two assembly parts 121 are located on both sides of the plane where the motor axis is located.

[0241] The handle housing 11 extends along the axial direction of the motor housing 12, meaning the power tool has a straight handle structure. Figure 1 shows a schematic diagram of the overall structure of the straight handle power wrench. One end of the handle housing 11 is connected to the assembly part 121, and the other end is a free end for the operator to grip. The handle housing 11 includes two handle covers 110 that cover and connect to the assembly part 121. The two handle covers 110 have abutment portions 111 that connect to the assembly part 121.

[0242] The elastic element 9 is located between the abutment portion 111 and the assembly portion 121. The connecting assembly 8 passes through the abutment portion 111, the assembly portion 121 and the elastic element 9, and locks the elastic element 9 between the abutment portion and the assembly portion 121.

[0243] The vibrations generated during the operation of the power tool are transmitted from the motor housing 12 to the elastic element 9 and then to the handle housing 11. Generally, the impact force generated by the power tool during operation, acting on the wall surface, produces vibrations, as does the motor.

[0244] The vibrations generated during the operation of power tools can be absorbed and dispersed by the elastic elements located on both sides of the motor shaft, further reducing the vibration and its impact.

[0245] The elastic element 9 is made of materials including but not limited to rubber and polymers. The elastic element 9 can effectively absorb and disperse vibration force, reducing the vibration force transmitted to the handle.

[0246] In an alternative embodiment, as shown in Figures 2 and 3, the handle housing 11 includes a second half-shell 11b and a first half-shell 11a, the second half-shell 11b matching the first half-shell 11a, and the second half-shell 11b and the first half-shell 11a respectively forming two handle covers 110.

[0247] The second half-shell 11b is connected to the first half-shell 11a by a snap-fit ​​connection, and the second half-shell 11b contacts the motor housing 12 to improve the integrity of the power tool.

[0248] The elastic element 9 includes a first elastic element 91 and a second elastic element 92. The first elastic element 91 is connected between the second half shell 11b and the assembly part 121, and the second elastic element 92 is connected between the first half shell 11a and the assembly part 121.

[0249] In an optional embodiment, as shown in Figures 2, 3, 4a, and 4b, the motor housing 12 is provided with a first mounting post 122, a second mounting post 112 is provided on the second half-shell 11b, and a third mounting post 113 is provided on the first half-shell 11a. The connecting assembly 8 is inserted into the first mounting post 122, the second mounting post 112, the third mounting post 113, and the abutment part 111, so that the second half-shell 11b and the first half-shell 11a are connected to the motor housing 12. The first mounting post 122 connects two oppositely arranged assembly parts 121, which are located on both sides of the motor axis.

[0250] Preferably, the connecting assembly 8 includes a connecting bolt 81 and a connecting nut 82. The connecting bolt 81 is inserted into the first mounting post 122, the second mounting post 112, the third mounting post 113 and the abutment part 111. The abutment part 111 includes a mounting hole. The two ends of the connecting bolt 81 pass through the mounting holes on the second half shell 11b and the first half shell 11a respectively, and are locked by the connecting nut 82, so that the connecting bolt 81 and the connecting nut 82 abut against the handle cover 110, thereby connecting the second half shell 11b and the first half shell 11a to the motor housing 12.

[0251] In an alternative embodiment, as shown in Figures 4a and 4b, the second mounting post 112 connects to the third mounting post 113. Figure 4b shows a cross-sectional view at point AA in Figure 4a, where point AA is the connection point of the assembly 121, the connecting component 8, the first elastic member 91, and the second elastic member 92.

[0252] This can be understood as the second mounting post 112 and / or the third mounting post 113 being relatively long, as shown in Figure 5, which illustrates the longer structure of the third mounting post 113. When the second mounting post 112 is connected to the third mounting post 113, the first elastic element 91 and the second elastic element 92 are respectively sleeved on the second mounting post 112 and the third mounting post 113, and the connecting bolt 81 is located inside the second mounting post 112 and the third mounting post 113, which can effectively reduce the vibration between the connecting bolt 81 and the second half-shell 11b, the first half-shell 11a, and the connecting nut 82.

[0253] In an optional embodiment, as shown in FIG4b, the first elastic element 91 is a first elastic ring 911, which is sleeved on the second mounting post 112 and abuts between the assembly part 121, the second mounting post 112, and the second half-shell 11b.

[0254] The second elastic element 92 is a second elastic ring 921, which is sleeved on the third mounting post 113 and abuts against the assembly part 121, the third mounting post 113 and the first half shell 11a.

[0255] Vibrations generated during the operation of the power tool are transmitted through the motor housing 12 to multiple first elastic rings 911 and multiple second elastic rings 921, and then to the second half-shell 11b and the first half-shell 11a. From there, the vibrations are transmitted from the second half-shell 11b and the first half-shell 11a, i.e., the second mounting post 112 and the third mounting post 113, to the connecting bolt 81. This effectively reduces the impact of vibration on the connecting assembly 8, thereby ensuring the connection stability of the second half-shell 11b, the first half-shell 11a, and the motor housing 12.

[0256] In another alternative embodiment, as shown in Figures 3 and 4c, the second mounting post 112 and the third mounting post 113 are spaced apart.

[0257] Figure 3 shows a shorter third mounting post 113 on the first half-shell 11a. Thus, the second mounting post 112 and the third mounting post 113 do not contact each other. Vibrations generated during the operation of the power tool are transmitted through the motor housing 12 to the first elastic element 91 and the second elastic element 92, and then from the first elastic element 91 and the second elastic element 92 to the second half-shell 11b and the first half-shell 11a, respectively. This separate transmission of vibration through the first elastic element 91 and the second elastic element 92 improves the vibration damping effect. Furthermore, the reduced length of the second and third mounting posts 112 and 113 reduces their space requirement. This allows the first elastic element 91 and the second elastic element 92 to fill the reduced space, increasing their volume. Larger volumes of the first and second elastic elements 91 and 92 result in better absorption and dispersion of vibration, further improving the vibration damping effect.

[0258] In an optional embodiment, as shown in FIG4c, the first elastic element 91 is a third elastic ring 912, which is sleeved on the connecting component 8 and the second mounting post 112, and abuts between the assembly part 121, the connecting component 8, the second mounting post 112 and the second half shell 11b.

[0259] The second elastic element 92 is the fourth elastic ring 922, which is sleeved on the connecting component 8 and the third mounting post 113. The fourth elastic ring 922 abuts against the assembly part 121, the connecting component 8, the third mounting post 113 and the first half shell 11a.

[0260] The third elastic ring 912 is fitted onto the connecting bolt 81 and the second mounting post 112, and the fourth elastic ring 922 is fitted onto the connecting bolt 81 and the third mounting post 113. Vibrations generated during the operation of the power tool are transmitted through the motor housing 12 to the third elastic ring 912 and the fourth elastic ring 922, and then from there to the second mounting post 112, the third mounting post 113, and the connecting bolt 81, respectively. The third elastic ring 912 and the fourth elastic ring 922 contact the connecting bolt 81, and also contact the second mounting post 112 and the third mounting post 113, thus dispersing the vibration force more effectively and reducing the vibration transmitted to the handle.

[0261] In an optional embodiment, as shown in Figures 4c and 6, the third elastic ring 912 and the fourth elastic ring 922 have the same structure. The fourth elastic ring 922 is provided with a first ring 9a and a second ring 9b. The first ring 9a is connected to the second ring 9b. The inner diameter of the first ring 9a matches the outer diameter of the connecting component 8, and the inner diameter of the second ring 9b matches the outer diameter of the third mounting post 113.

[0262] In this embodiment, the inner wall of the third elastic ring 912 abuts against both the connecting bolt 81 and the outer wall of the second mounting post 112, and the outer wall of the third elastic ring 912 abuts against both the motor housing 12 and the second half-shell 11b. The inner wall of the fourth elastic ring 922 abuts against both the connecting bolt 81 and the outer wall of the third mounting post 113, and the outer wall of the third elastic ring 912 abuts against both the motor housing 12 and the first half-shell 11a. By providing two different sizes of first ring 9a and second ring 9b for the fourth elastic ring 922, vibrations on the fourth elastic ring 922 can be transmitted to the third mounting post 113 and the connecting bolt respectively, improving the vibration damping effect and also improving the connection effect between the fourth elastic ring 922 and the first half-shell 11a. The third elastic ring 912 and the fourth elastic ring 922 have the same structure and are symmetrically arranged, which will not be described in detail here.

[0263] In an optional embodiment, as shown in Figures 7 and 4c, the first half-shell 11a is further provided with a first receiving groove 114, which is used to receive the fourth elastic ring 922. The outer diameter of the second ring matches the first receiving groove 114, and the first receiving groove 114 and the third mounting post 113 form abutment portion 111.

[0264] By accommodating the fourth elastic ring 922 within the first receiving groove 114, the connection between the fourth elastic ring 922 and the first half-shell 11a is ensured, while simultaneously improving the shock absorption effect of the fourth elastic ring 922. Similarly, the second half-shell 11b is also provided with a receiving groove for accommodating the third elastic ring 912, and the receiving groove for accommodating the third elastic ring 912 and the second mounting post 112 also form abutment portion 111.

[0265] In an optional embodiment, the motor housing 12 is provided with a second receiving groove 123, which forms an assembly portion 121. The second receiving groove 123 is used to receive a first ring 9a, and the outer diameter of the first ring 9a matches the second receiving groove 123. The midpoint of the distance between the two opposing second receiving grooves 123 is located on the extension line of the motor axis. The elastic member 9 installed in the opposing second receiving grooves 123 can evenly distribute the vibration generated during the operation of the power tool.

[0266] Two opposing second receiving grooves 123 are used to receive the third elastic ring 912 and the fourth elastic ring 922 respectively. One end of the elastic third elastic ring 912 and the fourth elastic ring 922 is installed in the assembly part 121, i.e., the second receiving groove 123, which can effectively absorb and disperse the vibration force transmitted from the motor housing 12, and at the same time ensure the connection effect between the third elastic ring 912 and the fourth elastic ring 922 and the assembly part 121, further ensuring the shock absorption effect.

[0267] In another embodiment, as shown in Figures 8 to 10, the power tool 100 includes a motor 3, a power mechanism, a gearbox 132, a front bearing 401, a rear bearing 402, an auxiliary support bearing 403, a planetary carrier support bearing 404, a shock-absorbing sealing sleeve 501, and a motor housing 12.

[0268] As shown in Figures 8 and 9, the motor 3 is installed inside the motor housing 12, and the motor 3 includes a rotor shaft 31. The front bearing 401 includes an outer bearing ring 4011 and an inner bearing ring 4012. The outer bearing ring 4011 is sealed to the gearbox 132, and the inner bearing ring 4012 is fitted onto the outer circumference of the front end of the rotor shaft 31. That is, the rotor shaft 31 is installed on the gearbox 132 via the front bearing 401. The front bearing 401 and the rear bearing 402 are respectively fitted onto the outer circumference of the front end and the rear end of the rotor shaft 31, and both the front bearing 401 and the rear bearing 402 are interference-fitted with the rotor shaft 31 to support the rotor shaft 31.

[0269] As shown in Figures 8 to 10, the power mechanism includes a transmission assembly 4 and a main shaft 54. The transmission assembly 4 is located inside the gearbox 132. The transmission assembly 4 includes a planet carrier 44, planet gears 43, a sun gear 41, and an internal gear ring 42. The sun gear 41 is integrally formed on the front end of the rotor shaft 31. The internal gear ring 42 is installed on the inner wall of the gearbox 132. The planet carrier 44 is installed on the inner wall of the gearbox 132 through a planet carrier support bearing 404. The planet gears 43 are installed on the planet carrier 44 and mesh with the sun gear 41 and the internal gear ring 42 respectively.

[0270] As shown in Figures 8 and 9, the gearbox 132 is provided with a through hole 1321. The motor 3 is located outside the gearbox 132. The rotor shaft 31 passes through the through hole 1321 to extend into the gearbox 132, so that the sun gear 41 located at the front end of the rotor shaft 31 is in transmission engagement with the input end (planetary gear 43) of the transmission assembly 4.

[0271] As shown in Figures 8 and 9, the auxiliary support bearing 403 is located in front of the front bearing 401. The auxiliary support bearing 403 is connected to the planetary carrier 44 and is sleeved on the rotor shaft 31 with a clearance fit. This clearance configuration allows the auxiliary support bearing 403 to move with the planetary carrier 44. At the same time, when the motor 3 produces a certain degree of radial wobble, the auxiliary support bearing 403 can also provide auxiliary support for the front end of the rotor shaft 31, reducing the deformation amplitude of the front part of the rotor shaft 31 or preventing deformation. This can avoid the phenomenon of unstable meshing between the sun gear 41 and the planetary gear 43 formed at the front end of the rotor shaft 31, and prevent the power tool 100 from not working smoothly under harsh working conditions.

[0272] As shown in Figures 8 and 9, the vibration damping seal 501 is located between the front bearing 401 and the auxiliary support bearing 403. The vibration damping seal 501 is fitted onto the rotor shaft 31 with an interference fit, so that the vibration damping seal 501 can move with the rotor shaft 31. The rear end of the vibration damping seal 501 abuts against the front bearing 401 to seal the assembly gap between the bearing inner ring 4012 and the rotor shaft 31. Specifically, the outer ring 4011 of the bearing is sealed to the gearbox 132, which can prevent the lubricating grease in the gearbox 132 from leaking to the motor 3 through the assembly of the outer ring 4011 of the bearing and the gearbox 132. At the same time, the assembly gap between the inner ring 4012 of the bearing and the rotor shaft 31 is sealed by the shock-absorbing sealing sleeve 501, which can prevent the lubricating grease in the gearbox 132 from leaking to the motor 3 through the assembly of the inner ring 4012 of the bearing and the rotor shaft 31. In other words, the grease in the gearbox 132 can be prevented from leaking to the motor 3 through the assembly of the rotor shaft 31 and the gearbox 132.

[0273] To facilitate assembly, a small gap is left at the assembly point between the motor 3 and the motor housing 12 during installation, allowing for slight axial movement (e.g., 1mm). However, when the power tool 100 is in operation, both the power mechanism and the motor 3 will move back and forth, resulting in noticeable vibration and a poor user experience. Furthermore, the backward movement of the power mechanism forces the planetary carrier support bearing 404 to impact the gearbox 132, and the forward movement of the motor 3 forces the front bearing 401 to impact the gearbox 132. This can easily damage the planetary carrier support bearing 404 and the front bearing 401, leading to malfunctions in the power tool 100. It should be understood that the specific structure and impact principle of the power mechanism can be referenced from the structure and principle of any existing power tool, and will not be elaborated upon here.

[0274] In this design, when the power tool 100 is started, during the back-and-forth movement of the power mechanism, the auxiliary support bearing 403 moves back and forth with the transmission assembly 4, pressing against the shock-absorbing seal sleeve 501. The shock-absorbing seal sleeve 501 absorbs part of the rearward impact force generated by the power mechanism, thus damping the power mechanism and reducing the rearward impact exerted by the planetary carrier support bearing 404 on the gearbox 132, thereby extending the service life of the planetary carrier support bearing 404. During the back-and-forth movement of the motor 3, the shock-absorbing seal sleeve 501 moves back and forth with the rotor shaft 31, pressing against the auxiliary support bearing 403. The shock-absorbing seal sleeve 501 withstands the reverse pressing force exerted by the auxiliary support bearing 403, thus absorbing part of the forward impact force generated by the motor 3, thus damping the motor 3 and reducing the forward impact exerted by the front bearing 401 on the gearbox 132, thereby extending the service life of the front bearing 401.

[0275] By adopting the above technical solution, an auxiliary support bearing 403 is set in front of the front bearing 401 to provide auxiliary support for the front end of the rotor shaft 31, reducing the deformation amplitude of the front part of the rotor shaft 31 or preventing deformation, and ensuring the smooth operation of the whole machine. A shock-absorbing sealing sleeve 501 is set between the front bearing 401 and the auxiliary support bearing 403. On the one hand, it seals the assembly point between the bearing inner ring 4012 and the rotor shaft 31. On the other hand, by limiting the back-and-forth movement of the auxiliary support bearing 403 with the power mechanism, and the back-and-forth movement of the shock-absorbing sealing sleeve 501 with the rotor shaft 31, when the power tool 100 is turned on, the shock-absorbing sealing sleeve 501 and the auxiliary support bearing 403 can be squeezed, thereby playing a shock-absorbing role for both the motor 3 and the power mechanism, reducing the vibration during the operation of the whole machine, and improving the user experience.

[0276] In one embodiment, the transmission assembly 4 is an NW gear system, which has higher transmission efficiency and a wider transmission ratio range than an NGW gear system, thereby increasing the output torque of the power tool 100. Furthermore, the NW gear system has a smaller radial dimension than the NGW gear system, which helps to reduce the radial dimension of the power tool 100. In addition, since the axial dimension of the NW gear system is larger than that of the NGW gear system, the axial distance between the front bearing 401 and the sun gear 41 is longer, leading to unstable transmission. Therefore, by adding an auxiliary support bearing 403 to provide auxiliary support for the front end of the rotor shaft 31, the stability of the transmission is ensured.

[0277] In one embodiment, the shock-absorbing sealing sleeve 501 is a rubber component, which has good shock absorption performance. Of course, the shock-absorbing sealing sleeve 501 can also be made of other materials, such as silicone seals.

[0278] In one embodiment, as shown in FIG9, when the power tool 100 is in the initial state, there is a gap 5013 between the front end of the shock-absorbing sealing sleeve 501 and the auxiliary support bearing 403. Specifically, when the power tool 100 is started, the power mechanism will inevitably move in the front-back direction to form an impact. By providing a gap 5013 between the shock-absorbing sealing sleeve 501 and the auxiliary support bearing 403, the shock-absorbing sealing sleeve 501 is prevented from affecting the impact effect of the power mechanism. The clearance 5013 is configured such that when the power tool 100 is operating, the auxiliary support bearing 403 and the shock-absorbing seal 501 can collide. Since the auxiliary support bearing 403 impacts the shock-absorbing seal 501 at high frequency and speed, the shock-absorbing seal 501 can continuously switch between deformed and restored deformed states. The shock-absorbing seal 501 absorbs the impact force by deforming and then restores its deformed state to absorb the impact force again, resulting in better shock absorption. Specifically, by limiting the size of the clearance 5013, it is ensured that when the forward and backward movement of the power mechanism and the motor 3 reaches a certain level without affecting the impact effect of the power mechanism, the shock-absorbing seal 501 can play a shock absorption role.

[0279] Furthermore, the gap 5013 has a dimension of less than 2mm in the front-to-back direction, ensuring that the shock-absorbing seal 501 can effectively absorb shocks when the power tool 100 is in operation.

[0280] Of course, when the power tool 100 is in its initial state, there can be no gap between the front end of the shock-absorbing seal sleeve 501 and the auxiliary support bearing 403, and the two can be in abutting state. In this way, when the power tool 100 is started, the shock-absorbing seal sleeve 501 and the auxiliary support bearing 403 will move in opposite directions, or the shock-absorbing seal sleeve 501 and the auxiliary support bearing 403 will move in the same direction, but the latter in that direction will move faster. In this case, the shock-absorbing seal sleeve 501 and the auxiliary support bearing 403 will immediately squeeze together to achieve shock absorption.

[0281] In one embodiment, as shown in Figures 9 and 11, the shock-absorbing sealing sleeve 501 includes a protrusion 5011 and a recess 5012, which are distributed sequentially in the front-rear direction to improve the shock absorption performance of the shock-absorbing sealing sleeve 501.

[0282] Furthermore, the number of at least one of the protrusions 5011 and the recesses 5012 is greater than or equal to two, and the protrusions 5011 and the recesses 5012 are alternately distributed in the front-back direction. By increasing the number of protrusions 5011 and / or recesses 5012, the damping performance of the shock-absorbing sealing sleeve 501 is further improved. Of course, the structural shape of the shock-absorbing sealing sleeve 501 is not limited to this. For example, the outer wall of the shock-absorbing sealing sleeve 501 can be set as a grid-like uneven surface.

[0283] In one embodiment, as shown in Figures 8 and 13, the spindle 54 and the planetary carrier 44 are integrally formed, and the auxiliary support bearing 403 is mounted on the spindle 54.

[0284] In one embodiment, as shown in Figures 9 and 12, the rear side wall of the gearbox 132 is provided with a mounting groove 1322, and a through hole 1321 penetrates the mounting groove 1322. The mounting groove 1322 is provided with a retaining groove 13221, and a sealing ring 502 is engaged in the retaining groove 13221. The bearing outer ring 4011 is engaged in the mounting groove 1322. The sealing ring 502 is used to seal the assembly gap between the bearing outer ring 4011 and the mounting groove 1322 to prevent the lubricating grease in the gearbox 132 from leaking to the motor 3 from the assembly point of the bearing outer ring 4011 and the mounting groove 1322.

[0285] Furthermore, as shown in Figure 9, the rear end of the shock-absorbing sealing sleeve 501 extends into the through hole 1321 to abut against the front bearing 401, and the circumferential surface wall of the shock-absorbing sealing sleeve 501 is clearance-fitted with the hole wall of the through hole 1321. In this way, when the shock-absorbing sealing sleeve 501 moves back and forth or rotates with the rotor shaft 31, the hole wall of the through hole 1321 will not interfere with the movement of the shock-absorbing sealing sleeve 501.

[0286] In one embodiment, as shown in Figures 9 and 13, the planetary carrier 44 is provided with a sleeve hole 441, and the auxiliary support bearing 403 is snapped into the sleeve hole 441 and limited by a snap ring, which makes assembly convenient. Furthermore, the two are interference-fitted so that the auxiliary support bearing 403 can move with the planetary carrier 44.

[0287] In one embodiment, as shown in FIG9, the rear wall of the planetary carrier 44 is provided with a first annular snap-fit ​​protrusion 442, and the inner wall of the gearbox 132 is provided with a second annular snap-fit ​​protrusion 1323. The first annular snap-fit ​​protrusion 442 and the second annular snap-fit ​​protrusion 1323 together form an annular snap-fit ​​groove (not shown in the figure), and the planetary carrier support bearing 404 is snapped into the snap-fit ​​groove.

[0288] In another embodiment, as shown in Figures 14 to 17, the power tool 100 includes a motor 3, a rear bearing 402, a motor housing 12, a handle housing 11, an elastic element 9, and an impact assembly 5. The motor 3 is located in the motor housing 12 and includes a rotor shaft 31. The motor 3 outputs rotational driving force to the impact assembly 5 through the rotor shaft 31. The rear bearing 402 is sleeved on the rear part of the rotor shaft 31 with an interference fit, and the rear bearing 402 is used to support the rear part of the rotor shaft 31. The motor housing 12 is cylindrical to house the motor 3. A bearing chamber is formed on the inner side of the bottom wall of the motor housing 12 to house the rear bearing 402. A first connecting structure 124 is provided on the outer side of the bottom wall of the motor housing 12. The handle housing 11 is provided with a grip portion 115 and a second connecting structure 116. The grip portion 115 is used for the operator to grip the power tool 100. The first connecting structure 124, the elastic element 9, and the second connecting structure 116 are distributed in sequence along the radial direction of the motor 3. The first connecting structure 124 is connected to the second connecting structure 116 and clamps the elastic element 9 in the radial direction of the motor 3. The elastic element 9 is used to radially dampen the handle housing 11.

[0289] By adopting the above technical solution, the bearing chamber and the first connecting structure 124 are respectively located on the inner and outer sides of the rear side of the motor housing 12, and an elastic element 9 is set between the first connecting structure 124 and the second connecting structure 116. In this way, during the operation of the power tool 100, the vibration generated by the impact component 5 is transmitted rearward sequentially to the motor 3, the rear bearing 402, and the first connecting structure 124 of the motor housing 12. The vibration is then transmitted to the handle housing 11 through the connection between the first connecting structure 124 and the second connecting structure 116. The setting of the first connecting structure 124 can increase the thickness of the motor housing 12 at the bearing chamber to a certain extent. In addition, when the power tool is operating, the elastic element 9 can reduce the vibration transmitted from the first connecting structure 124 to the second connecting structure 116 along the radial direction of the motor, reduce the damage of vibration to the motor housing 12, improve the structural strength of the motor housing 12 at the bearing chamber, and ensure that the motor is effectively supported.

[0290] In one embodiment, as shown in Figures 15 to 18, the power tool 100 further includes a connecting component 8 (e.g., a bolt). A first connecting structure 124 has a first mounting hole 125, and a second connecting structure 116 has a second mounting hole 1161. The axes of the first mounting hole 125 and the second mounting hole 1161 coincide and are perpendicular to the axis of the motor 3. The connecting component 8 mates with the first mounting hole 125 and the second mounting hole 1161 to connect the first connecting structure 124 and the second connecting structure 116. The axis of the connecting component 8 is perpendicular to the axis of the motor 3. Of course, the connection method between the first connecting structure 124 and the second connecting structure 116 is not limited to connecting components; for example, it can also be a snap-fit ​​connection.

[0291] Furthermore, as shown in Figure 16, the elastic element 9 is sleeved on the outer periphery of the connecting component 8 and the two are interference-fitted. In this way, the elastic element 9 can also weaken the axial and radial vibrations generated by the connecting component 8, so as to reduce the vibration transmitted from the connecting component 8 to the second connecting structure 116.

[0292] In one embodiment, as shown in Figures 14 and 17, the axis of the motor 3 extends in the front-to-back direction, and the axes of the first mounting hole 125, the second mounting hole 1161, and the connecting assembly 8 all extend in the left-to-right direction.

[0293] In one embodiment, as shown in Figures 16 and 18, the second connecting structure 116 includes a column portion 1162 and an annular extension portion 1163. A second mounting hole 1161 is provided on the column portion 1162. The annular extension portion 1163 is provided around the column portion 1162 and an annular groove 1164 is formed between the two. The elastic member 9 includes a second ring 9b and a connecting portion 9c connected in sequence in the radial direction of the motor 3.

[0294] The second ring 9b is engaged in the annular groove 1164. When the vibration of the first connecting structure 124 is transmitted to the column part 1162 through the connecting component 8, the column part 1162 vibrates and is pressed against the second ring 9b. The second ring 9b is deformed by the compression, thereby absorbing the vibration force transmitted from the column part 1162 to the annular extension 1163 along the axial direction of the motor 3, thereby axially damping the handle housing 11.

[0295] The outer end face of the second ring 9b abuts against the bottom wall of the annular groove 1164 along the radial direction of the motor 3, and the connecting part 9c abuts against the end of the column part 1162 along the radial direction of the motor 3. When the first connecting structure 124 vibrates along the radial direction of the motor 3, the first connecting structure 124 compresses the elastic member 9 along the radial direction of the motor 3, the second ring 9b compresses the bottom wall of the annular groove 1164 along the radial direction of the motor 3, and the connecting part 9c compresses the end of the column part 1162 along the radial direction of the motor 3. The elastic member 9 is deformed by compression to absorb the vibration force transmitted by the first connecting structure 124 along the radial direction of the motor 3 toward the second connecting structure 116, thereby enabling radial shock absorption of the handle housing 11.

[0296] Furthermore, as shown in Figures 16 and 19, the inner wall of the second ring 9b is provided with a first concave-convex surface 9b1. The first concave-convex surface 9b1 abuts against the outer wall of the column portion 1162 in the axial direction of the motor 3. Thus, when the column portion 1162 presses against the first concave-convex surface 9b1 along the axial direction of the motor 3, the concave-convex surface structure can increase the deformation amplitude of the second ring 9b, thereby improving the axial damping effect. Preferably, the first concave-convex surface 9b1 has a sawtooth structure.

[0297] In one embodiment, as shown in Figures 16 and 19, the elastic member 9 further includes a first ring 9a, a second ring 9b, a connecting portion 9c, and the first ring 9a connected in sequence in the radial direction of the motor 3, and the first connecting structure 124 is provided with a groove 126.

[0298] As shown in Figures 16 and 17, the first ring 9a is engaged with the groove 126. When the first connecting structure 124 vibrates along the axial direction of the motor 3, the groove sidewall of the groove 126 presses the first ring 9a along the axial direction of the motor 3. The first ring 9a is deformed by the compression, thereby absorbing the vibration force transmitted by the first connecting structure 124 along the axial direction of the motor 3, and thus axially damping the handle housing 11.

[0299] As shown in Figures 16 and 17, the outer end face of the first ring 9a abuts against the bottom wall of the groove 126 along the radial direction of the motor 3, and the connecting part 9c abuts against the outer end face of the elastic member 9 along the radial direction of the motor 3. When the first connecting structure 124 vibrates along the radial direction of the motor 3, the bottom wall of the groove 126 presses the first ring 9a along the radial direction of the motor 3, and the outer end face of the elastic member 9 presses the connecting part 9c along the radial direction of the motor 3. Both the connecting part 9c and the first ring 9a are deformed by compression, thereby absorbing the vibration force transmitted by the first connecting structure 124 along the radial direction of the motor 3 toward the second connecting structure 116, and thus being able to radially dampen the handle housing 11.

[0300] Furthermore, as shown in Figures 16 and 19, the outer wall of the first ring 9a is provided with a second concave-convex surface 9b2. The second concave-convex surface 9b2 abuts against the groove wall of the groove 126 in the axial direction of the motor 3. Thus, when the first connecting structure 124 vibrates along the axial direction of the motor 3, the groove wall of the groove 126 presses against the second concave-convex surface 9b2 along the axial direction of the motor 3. The concave-convex surface structure can increase the deformation amplitude of the first ring 9a, thereby improving the axial damping effect. Preferably, the second concave-convex surface 9b2 has a sawtooth structure.

[0301] In one embodiment, as shown in Figures 15 to 17, the handle housing 11 includes a second half-shell 11b and a first half-shell 11a. The second half-shell 11b and the first half-shell 11a are each provided with a second connecting structure 116. The second connecting structure 116 of the second half-shell 11b, an elastic element 9, a first connecting structure 124, another elastic element 9, and the second connecting structure 116 of the first half-shell 11a are sequentially distributed along the radial direction of the motor 3 and locked together by a connecting assembly 8. In this design, the handle housing 11 is configured as a split structure for easy assembly. Furthermore, the second connecting structure 116 is provided on both the second half-shell 11b and the first half-shell 11a. An elastic element 9 is provided at the connection between the second half-shell 11b and the first connecting structure 124, and another elastic element 9 is provided at the connection between the first half-shell 11a and the first connecting structure 124, which improves the shock absorption effect. The two elastic elements 9 are symmetrically arranged about the axis of the motor 3. The first connecting structure 124 is symmetrical about the axis of the motor 3. The first connecting structure 124 includes two grooves 126 for the first ring 9a of the two elastic elements 9 to be engaged respectively.

[0302] Furthermore, as shown in Figure 17, there are three connecting components 8, three first connecting structures 124, three second connecting structures 116 on the second half-shell 11b, and an elastic element 9 is provided at each of the three connection points between the second half-shell 11b and the motor housing 12. There are also three second connecting structures 116 on the first half-shell 11a, and an elastic element 9 is provided at each of the three connection points between the first half-shell 11a and the motor housing 12.

[0303] Furthermore, as shown in Figure 15, the second mounting hole 1161 of one of the second connecting structures 116 of the second half-shell 11b and the first half-shell 11a is a through hole, serving as the insertion port for the connecting component 8, while the second mounting hole 1161 of the other second connecting structure 116 is a blind hole to improve aesthetics.

[0304] It should be understood that in this article, the radial and axial directions in "radial damping" and "axial damping" are both relative to the motor 3. That is, radial damping means reducing the vibration generated by the power tool 100 in the radial direction of the motor 3, and axial damping means reducing the vibration generated by the power tool 100 in the axial direction of the motor 3.

[0305] In another embodiment, as shown in Figures 20 to 22, the power tool 100 includes a motor 3, a transmission assembly 4, a front bearing 401, a rear bearing 402, an auxiliary support bearing 403, and a gearbox 132. The motor 3 includes a rotor shaft 31 for outputting rotational driving force. The transmission assembly 4 is housed within the gearbox 132 and is located in front of the motor 3. The transmission assembly 4 can be specifically implemented as an NW-type planetary gear system structure. The transmission assembly 4 includes planet gears 43, an internal gear ring 42, a planet carrier 44, and a sun gear 41 formed at the front end of the rotor shaft 31. The planet gears 43 are mounted on the planet carrier 44 and mesh with the internal gear ring 42 and the sun gear 41, respectively. The output torque of the power tool 100 is greater than or equal to 2000 N·m, and the maximum distance between the central axis of the gearbox 132 and its outer wall is less than or equal to 60 mm. It should be understood that the outer wall of the gearbox 132 does not include the surface of the fastening screws mounted on the gearbox 132. The front bearing 401 and the rear bearing 402 are respectively sleeved on the outer periphery of the rotor shaft 31, and the front bearing 401 and the rear bearing 402 are respectively located on the front and rear sides of the main body housing of the motor 3 to support the rotor shaft 31. The auxiliary support bearing 403 is sleeved on the outer periphery of the rotor shaft 31, and the auxiliary support bearing 403 is located between the sun gear 41 and the front bearing 401.

[0306] By adopting the above technical solution, the power tool 100 uses a transmission component 4, which has higher transmission efficiency and a wider transmission ratio range compared to the NGW gear system. This can improve the output torque of the power tool 100, making the output torque of the power tool 100 greater than or equal to 2000 N·m. Furthermore, the transmission component 4 has a smaller radial dimension compared to the NGW gear system, which allows the maximum distance between the central axis of the gearbox 132 and its outer wall to be less than or equal to 60 mm, which is beneficial for the miniaturization design of the radial dimension of the power tool 100. Furthermore, since the axial dimension of the transmission assembly 4 is larger than that of the NGW gear system, the axial distance between the front bearing 401 and the sun gear 41 is longer, resulting in unstable transmission. In this solution, the power tool 100 is equipped with an auxiliary support bearing 403. The auxiliary support bearing 403 supports the rotor shaft 31 at the position between the sun gear 41 and the front bearing 401, reducing the deformation amplitude of the front part of the rotor shaft 31 or preventing deformation of the front part of the rotor shaft 31. This can avoid the phenomenon of unstable meshing between the sun gear 41 and the planet gears 43, and prevent the power tool 100 from not working smoothly under harsh working conditions, that is, ensure the smooth operation of the whole machine.

[0307] In one embodiment, as shown in Figures 21 and 22, one end of the planetary carrier 44 is provided with an axially extending cavity 443 and a radially extending first mounting groove 444. The cavity 443 and the first mounting groove 444 are connected. The planetary gears 43 are mounted in the first mounting groove 444, and the front end of the rotor shaft 31 is inserted into the cavity 443 and meshes with the planetary gears 43. In a specific embodiment, there are two planetary gears 43. The first mounting groove 444 extends radially through the main body of the planetary carrier 44. The two planetary gears 43 are located on the radial sides of the sun gear 41 and are respectively mounted on the planetary carrier 44 via planetary pins 445.

[0308] Furthermore, the auxiliary support bearing 403 is mounted on the planetary carrier 44.

[0309] Furthermore, as shown in Figure 21, the auxiliary support bearing 403 is installed in the cavity 443, and the internal space of the cavity 443 is used to accommodate the auxiliary support bearing 403, so as to avoid increasing the size of the power tool 100 due to the installation of the auxiliary support bearing 403.

[0310] Furthermore, as shown in Figure 21, the cavity wall of the concave cavity 443 is provided with a boss 4431. The outer ring of the auxiliary support bearing 403 radially abuts against the cavity wall of the concave cavity 443 and axially abuts against the boss 4431. The inner ring of the auxiliary support bearing 403 is sleeved on the rotor shaft 31. The auxiliary support bearing 403 is simple and firm to assemble.

[0311] Further, as shown in Figures 21 and 22, the boss 4431 is located between the first mounting groove 444 and the auxiliary support bearing 403. Thus, when assembling the auxiliary support bearing 403, it is inserted into the open end of the cavity 443 of the planetary carrier 44 until it abuts against the boss 4431, facilitating assembly. Of course, the position of the boss 4431 is not limited to this; the auxiliary support bearing 403 can also be located between the boss 4431 and the first mounting groove 444. In this case, when assembling the auxiliary support bearing 403, it is inserted into the cavity 443 from the first mounting groove 444 until it abuts against the boss 4431, completing the assembly. However, this arrangement is slightly less convenient.

[0312] Furthermore, the boss 4431 is annular, which is beneficial for stable axial contact with the auxiliary support bearing 403.

[0313] In one embodiment, the rear end of the gearbox 132 is provided with a second mounting groove (not shown in the figure), and the front bearing 401 is mounted in the second mounting groove, which makes assembly simple.

[0314] Furthermore, as shown in Figure 21, an annular protrusion 1324 is provided on the rear end surface of the gearbox 132, and a second mounting groove is formed between the annular protrusion 1324 and the rear end surface of the gearbox 132, which is simple to process.

[0315] In one embodiment, as shown in Figures 21 and 22, the axial dimension of the auxiliary support bearing 403 is smaller than that of the front bearing 401. In this way, the front part of the rotor shaft 31 is supported by the auxiliary support bearing 403, stabilizing the operation of the whole machine. At the same time, it also avoids the auxiliary support bearing 403 being inconvenient to assemble due to its long axial dimension, or even causing an increase in the axial dimension of the power tool 100.

[0316] In this embodiment, as shown in Figures 1 to 3, the power tool 100 includes a housing 1, a motor 3, and a transmission assembly 4. The housing 1 forms the outer contour structure of the power tool 100. The motor 3 is disposed within the housing 1 and has a rotor shaft 31. The transmission assembly 4 includes a first-stage planetary gear train 4a and a second-stage planetary gear train 4b. The rotor shaft 31, the first-stage planetary gear train 4a, and the second-stage planetary gear train 4b are sequentially coupled and driven. The rotational speed output by the motor 3 is transmitted sequentially via the first-stage planetary gear train 4a and the second-stage planetary gear train 4b. The outer diameter of the transmission assembly 4 is ≤70mm, the length of the transmission assembly 4 is ≤50mm, and the transmission assembly 4 is configured to provide a total reduction ratio of at least 13:1. The maximum tightening torque of the power tool 100 is at least 1500 N·m.

[0317] By adopting the above technical solution and using a two-stage planetary gear system, it is possible to ensure that the maximum tightening torque of the power tool 100 is at least 1500 N·m. At the same time, the outer diameter of the transmission component 4 can be controlled within 70 mm and the length of the transmission component 4 can be controlled within 50 mm. This ensures high torque output while also facilitating the miniaturization design of the power tool 100.

[0318] In another embodiment, as shown in FIG23, the power tool 100 further includes an impact assembly 5, a spindle 54, and an output shaft 2 located in front of the spindle 54. The impact assembly 5 includes an impact block 51, a spring 53, and a first ball (not shown in the figure). The impact block 51 is sleeved on the outer periphery of the spindle 54. The inner wall of the impact block 51 is provided with an annular cavity 511. The annular cavity 511 contains a second ball 52. One end of the spring 53 abuts against the spindle 54, and the other end abuts against the second ball 52, with a washer 55 provided between them. The inner wall of the impact block 51 is provided with a first guide groove (not shown in the figure), and the outer wall of the spindle 54 is provided with a second guide groove (not shown in the figure). The first guide groove and the second guide groove together form a guide ball track, and the first ball is movably located in the guide ball track. The main shaft 54 ​​is driven by the second-stage planetary gear train 4b. The rotor shaft 31 drives the main shaft 54 ​​to rotate through the transmission assembly 4. The main shaft 54 ​​drives the impact block 51 to move through the first ball bearing. The impact block 51 drives the output shaft 2 to move, so as to output the working power. The outer diameter of the impact block 51 is ≤77mm, which helps to reduce the outer diameter of the whole machine.

[0319] Furthermore, the outer diameter of the housing 1 is ≤105mm, and the power tool 100 has a compact structure in the radial direction.

[0320] In one embodiment, as shown in Figures 24 and 25, the first-stage planetary gear train 4a includes a first sun gear 4a1, four first planetary gears 4a2, a first internal gear ring 4a3, and a first planet carrier 4a4. The first sun gear 4a1 is located at the end of the rotor shaft 31. The first sun gear 4a1 can be sleeved on the end of the motor drive shaft 21, or the two can be integrally formed. The first internal gear ring 4a3 is mounted on the inner wall of the housing 1, and the first planetary gears 4a2 are mounted on the first planet carrier 4a4 and mesh with the first sun gear 4a1 and the first internal gear ring 4a3, respectively. Of course, the number of first planetary gears 4a2 is not limited to four and can be adjusted according to the reduction ratio requirements.

[0321] Further, as shown in Figures 24 and 25, the second-stage planetary gear train 4b includes a second sun gear 4b1, four second planetary gears 4b2, a second internal gear ring 4b3, and a second planetary carrier 4b4. The second sun gear 4b1 is integrally formed on the first planetary carrier 4a4. The second internal gear ring 4b3 is mounted on the inner wall of the housing 1. The second planetary carrier 4b4 has multiple second mounting holes, in which second planetary pins 4b41 are mounted. The second planetary gears 4b2 are mounted on the second planetary pins 4b41 of the second planetary carrier 4b4 and mesh with the second sun gear 4b1 and the second internal gear ring 4b3, respectively. Of course, the number of second planetary gears 4b2 is not limited to four and can be adjusted according to the reduction ratio requirements.

[0322] In one embodiment, as shown in FIG24, the second planetary carrier 4b4 is integrally formed at the end of the main shaft 54, which is beneficial to the compactness of the structure.

[0323] In one embodiment, as shown in FIG24, the second internal gear ring 4b3 abuts against the front end face of the first internal gear ring 4a3, which is beneficial to reducing the axial dimension of the power tool 100.

[0324] Further, as shown in Figure 24, the first planetary carrier 4a4 includes a main body 4a41 and four first planetary pins 4a42. The main body 4a41 is provided with multiple first mounting holes, and the first planetary pins 4a42 are mounted in the first mounting holes. The first planetary gears 4a2 are mounted one by one in the first planetary pins 4a42. A needle roller bearing 405 is provided between the first planetary gears 4a2 and the first planetary pins 4a42. The second sun gear 4b1 is located on the side of the main body 4a41 away from the first planetary pins 4a42. Both ends of the main body 4a41 extend into the first internal gear ring 4a3 and the second internal gear ring 4b3, respectively. The main body 4a41 is accommodated by the internal space of the first internal gear ring 4a3 and the second internal gear ring 4b3, which helps to reduce the axial dimension of the power tool 100.

[0325] In one embodiment, as shown in FIG24, the second planetary carrier 4b4 is mounted on the inner wall of the housing 1 by a rolling bearing 406. Since the second planetary carrier 4b4 is integrally formed on the main shaft 54, the rolling bearing 406 supports the second planetary carrier 4b4 and also supports the rear end of the main shaft 54.

[0326] In one embodiment, as shown in Figures 23 and 25, the housing 1 includes a head shell 131, a gearbox 132, a gearbox rear cover 134, a motor housing 12, and a handle housing 11 arranged sequentially from front to back. The two ends of the gearbox 132 are connected to the head shell 131 and the gearbox rear cover 134, respectively, and the three together form a transmission chamber. The impact assembly 5 and the main shaft 54 ​​are both located in the head shell 131. One end of the output shaft 2 is located in the head shell 131 to drive the impact block 51, and the other end extends to the outside of the head shell 131. The transmission assembly 4 is located in the gearbox formed by the gearbox 132 and the gearbox rear cover 134.

[0327] In another embodiment, as shown in Figures 26 to 30, the power tool 100 includes a housing 1, a motor 3, a transmission assembly 4, an impact assembly 5, a spindle 54, and an output shaft 2. The housing 1 includes a head shell 131, a gearbox 132, a gearbox rear cover 134, and a motor housing 12 connected sequentially from front to back. The motor 3 is located inside the motor housing 12 and includes a rotor shaft 31. The transmission assembly 4 includes a first-stage planetary gear train 4a and a second-stage planetary gear train 4b that are in transmission engagement. The rotor shaft 31 is in transmission engagement with the first-stage planetary gear train 4a. The rotational speed output by the motor 3 is transmitted sequentially through the first-stage planetary gear train 4a and the second-stage planetary gear train 4b. The gearbox 132 has open structures at both its front and rear ends. The transmission assembly 4 is located inside the gearbox 132. The gearbox rear cover 134 covers the rear open end of the gearbox 132. The gearbox 132 and the gearbox rear cover 134 together form a gearbox structure.

[0328] The impact assembly 5 is located in the head shell 131. The impact assembly 5 includes an impact block 51, a spring 53, and a first ball (not shown in the figure). The impact block 51 is sleeved on the outer periphery of the main shaft 54. The inner wall of the impact block 51 has an annular cavity 511, and the annular cavity 511 contains a second ball 52. One end of the spring 53 abuts against the main shaft 54, and the other end abuts against the second ball 52, with a washer 55 between them. The inner wall of the impact block 51 has a first guide groove (not shown in the figure), and the outer wall of the main shaft 54 ​​has a second guide groove (not shown in the figure). The first guide groove and the second guide groove together form a guide ball track, and the first ball is movably located in the guide ball track. The main shaft 54 ​​is driven by the second-stage planetary gear train 4b. The rotor shaft 31 drives the main shaft 54 ​​to rotate through the transmission assembly 4. The main shaft 54 ​​drives the impact block 51 to move through the first ball, and the impact block 51 drives the output shaft 2 to move to output working power.

[0329] By adopting the above technical solution, the gearbox structure is set as a split structure in which the gearbox 132 and the gearbox rear cover 134 are matched. In this way, during assembly, the installation is from front to back. First, the output shaft 2, the impact assembly 5 and the main shaft 54 ​​are installed into the head housing 131. Then, the second-stage planetary gear train 4b is installed from the rear opening of the gearbox 132. Next, the first-stage planetary gear train 4a is installed from the rear opening of the gearbox 132. Finally, the gearbox rear cover 134 is installed. In this way, when assembling the corresponding planetary gear train, the planet carrier is installed first and then the planetary gears are installed. The planetary gears can be easily fitted onto the planetary pins of the planet carrier, which facilitates assembly and improves assembly efficiency.

[0330] In one embodiment, as shown in Figures 26 and 29, the power tool 100 includes fastening screws 601, and the head shell 131, gearbox 132, gearbox rear cover 134 and motor housing 12 are connected in sequence by fastening screws 601, which makes the assembly simple and secure.

[0331] Further, as shown in Figures 26 and 29, the head shell 131 includes a first connecting hole 1311, the gearbox 132 includes a second connecting hole 1325, the gearbox rear cover 134 includes a third connecting hole 1341, and the motor housing 12 includes a fourth connecting hole 127. The fastening screw 601 is relatively long and passes through the first connecting hole 1311, the second connecting hole 1325, the third connecting hole 1341, and the fourth connecting hole 127 in sequence before being screwed into the fastening nut 602, thereby connecting the head shell 131, the gearbox 132, the gearbox rear cover 134, and the motor housing 12 in sequence.

[0332] Furthermore, the outer wall of the head shell 131 is provided with a first protrusion 1312, and a first connecting hole 1311 is provided on the first protrusion 1312; the gearbox 132 includes a main body 1326 and a gear mounting cavity 1327 surrounded by the main body 1326, and a second connecting hole 1325 is provided on the main body 1326; the gearbox rear cover 134 includes a cover body 1342 and an extension 1343 surrounding the cover body 1342, and a third connecting hole 1341 is provided on the extension 1343; the outer wall of the motor housing 12 is provided with a second protrusion 128, and a fourth connecting hole 127 is provided on the second protrusion 128; the first protrusion 1312, the main body 1326, the extension 1343 and the second protrusion 128 abut against each other in sequence and are connected by fastening screws 601. When the head shell 131, gearbox 132, gearbox rear cover 134 and motor housing 12 are aligned in sequence, the first protrusion 1312, the main body 1326, the extension 1343 and the second protrusion 128 all protrude outward at least partially to facilitate the assembly of the fastening screw 601.

[0333] Furthermore, as shown in Figure 29, the first protrusion 1312, the main body 1326, the extension 1343, and the second protrusion 128 have the same circumferential outer contour shape to improve the aesthetics of the outer contour of the shell 1.

[0334] Further, as shown in Figures 28 to 30, the first-stage planetary gear train 4a includes a first internal gear ring 4a3, and the second-stage planetary gear train 4b includes a second internal gear ring 4b3. The first internal gear ring 4a3 and the second internal gear ring 4b3 are engaged in the gear mounting cavity 1327. Specifically, the circumferential outer contours of the first internal gear ring 4a3 and the second internal gear ring 4b3 are both concave and convex, and the cavity wall of the mounting cavity 1327 has a matching concave and convex structure, so that the first internal gear ring 4a3 and the second internal gear ring 4b3 are engaged in the gear mounting cavity 1327.

[0335] In one embodiment, as shown in Figures 28 and 29, the rear end face of the head housing 131 is provided with a first annular protrusion 1313, and the front end face of the gearbox 132 is provided with a first annular groove 1328. The first annular protrusion 1313 is inserted into the first annular groove 1328. Thus, when assembling the power tool 100, the gearbox 132 and the head housing 131 are first pre-positioned and pre-assembled through the first annular groove 1328 and the first annular protrusion 1313, and then the output shaft 2, The impact assembly 5 and the main shaft 54 ​​are installed into the head housing 131. Then, the second-stage planetary gear train 4b and the first-stage planetary gear train 4a are successively installed into the gearbox 132 through the rear opening. The gearbox rear cover 134 is abutted against the rear end face of the gearbox 132, and the motor housing 12 is abutted against the rear end face of the gearbox rear cover 134. The head housing 131, gearbox 132, gearbox rear cover 134 and motor housing 12 are connected in sequence by fastening screws 601.

[0336] In one embodiment, as shown in Figures 28 and 31, the rear end face of the gearbox 132 is provided with a second annular protrusion 1329, and the front end face of the gearbox rear cover 134 is recessed to form a cavity (not shown in the figure). The second annular protrusion 1329 is engaged with the cavity to position and pre-assemble the gearbox rear cover 134 and the gearbox 132.

[0337] Furthermore, as shown in Figures 28 and 31, the outer wall of the second annular protrusion 1329 is provided with an annular groove 13291, in which a sealing ring 502 is engaged. The sealing ring 502 seals the assembly gap between the second annular protrusion 1329 and the gearbox rear cover 134, preventing the lubricating oil in the gearbox 132 from leaking out from the assembly gap between the two.

[0338] In one embodiment, as shown in Figures 28 and 29, the power tool 100 includes a front bearing 401 for supporting the front of the rotor shaft 31. The rear end face of the gearbox rear cover 134 is provided with a second annular groove 1344, and the front bearing 401 is engaged with the second annular groove 1344. The first-stage planetary gear train 4a includes a first internal gear ring 4a3, a first sun gear 4a1, four first planetary gears 4a2, and a first planet carrier 4a4. The first sun gear 4a1 is located at the end of the rotor shaft 31. The first internal gear ring 4a3, the first sun gear 4a1, and the first planetary gears 4a2 are located in the gearbox 132. The front end of the rotor shaft 31 passes through the gearbox rear cover 134 and extends into the gearbox 132, so that the first sun gear 4a1 meshes with the first planetary gears 4a2.

[0339] In one embodiment, as shown in Figures 28 and 30, the second-stage planetary gear train 4b includes a second internal gear ring 4b3, a second sun gear 4b1, four second planetary gears 4b2, and a second planetary carrier 4b4. The second sun gear 4b1 is integrally formed on the first planetary carrier 4a4. The second internal gear ring 4b3 is mounted on the inner wall of the housing 1. The second planetary carrier 4b4 is provided with a plurality of fifth connecting holes. The second planetary pins 4b41 are installed in the fifth connecting holes. The second planetary gears 4b2 are installed on the second planetary pins 4b41 of the second planetary carrier 4b4 and mesh with the second sun gear 4b1 and the second internal gear ring 4b3 respectively.

[0340] In one embodiment, as shown in Figures 28 and 30, the first planetary carrier 4a4 includes a main body 4a41 and four first planetary pins 4a42. The main body 4a41 has multiple sixth connecting holes, and the first planetary pins 4a42 are installed in the sixth connecting holes. First planetary gears 4a2 are installed one by one in the first planetary pins 4a42. A needle roller bearing 405 is provided between the first planetary gears 4a2 and the first planetary pins 4a42. The second sun gear 4b1 is located on the side of the main body 4a41 opposite to the first planetary pins 4a42. Both ends of the main body 4a41 extend into the first internal gear ring 4a3 and the second internal gear ring 4b3, respectively. The main body 4a41 is accommodated within the internal spaces of the first and second internal gear rings 4a3 and 4b3, which helps to reduce the axial dimension of the power tool 100.

[0341] In one embodiment, as shown in FIG28, the second internal gear ring 4b3 abuts against the front end face of the first internal gear ring 4a3, which is beneficial to reducing the axial dimension of the power tool 100.

[0342] In one embodiment, as shown in FIG28, the second planetary carrier 4b4 is integrally formed on the end of the main shaft 54. The second planetary carrier 4b4 is mounted on the inner wall of the gearbox 132 by a rolling bearing 406. Since the second planetary carrier 4b4 is integrally formed on the main shaft 54, the rolling bearing 406 supports the second planetary carrier 4b4 and also supports the rear end of the main shaft 54.

[0343] In one embodiment, as shown in FIG27, the housing 1 further includes a handle housing 11, which forms a grip portion 115 for the operator to hold.

[0344] In another embodiment, as shown in Figures 32 to 37, the power tool 100 includes a tool body, an auxiliary handle 30, a mounting member 70, a first shock absorber 801, and a second shock absorber 802. The tool body includes a housing 1, an output shaft 2, a motor 3, and a transmission assembly 4. The output torque of the motor 3 is transmitted to the output shaft 2 through the transmission assembly 4. The tool body drives a tool head (such as a drill bit or screwdriver bit) to perform operations via the output shaft 2. The auxiliary handle 30 is connected to the housing 1 and located on the radial side of the output shaft 2. The auxiliary handle 30 includes a handle portion 303 and an attachment portion 301. The handle portion 303 is for the user to grip. The housing 1 has a first mounting portion 1a, and the attachment portion 301 has a second mounting portion 3011. The mounting member 70 passes through the second mounting portion 3011 and the first mounting portion 1a to mount the auxiliary handle 30 onto the housing 1. The first damping member 801 has a first damping part 8011 and a second damping part 8012, and the second damping member 802 has a third damping part 8021 and a fourth damping part 8022.

[0345] When the power tool 100 is in operation, the vibration generated by the tool body is transmitted to the mounting member 70 through the hole wall of the first mounting part 1a, thereby causing the mounting member 70 to vibrate. In order to dampen the auxiliary handle 30, as shown in Figures 34 to 36, at least a first damping member 801 and a second damping member 802 are sleeved on a mounting member 70. The first damping part 8011 and the third damping part 8021 are both located in the second mounting part 3011. Furthermore, the first damping part 8011 and the third damping part 8021 are respectively sandwiched between the hole wall of the second mounting part 3011 and the mounting member 70. The second damping part 8012 is sandwiched between the outer wall of the attachment part 301 and the mounting member 70. The fourth damping part 8022 is sandwiched between the outer wall of the attachment part 301 and the housing 1. Specifically, when the tool body vibrates along the axial direction of the output shaft 2, the mounting member 70 vibrates radially along the second mounting portion 3011. The first damping portion 8011 and the third damping portion 8021 can reduce the vibration transmitted from the mounting member 70 to the hole wall of the second mounting portion 3011, thus damping the auxiliary handle 30 in the axial direction of the output shaft 2. When the tool body vibrates radially along the output shaft 2, the mounting member 70 vibrates axially along the second mounting portion 3011. The second damping portion 8012 can reduce the vibration transmitted from the mounting member 70 to the outer wall of the attachment portion 301, and the fourth damping portion 8022 can reduce the vibration transmitted from the outer wall of the housing 1 to the outer wall of the attachment portion 301, thus damping the auxiliary handle 30 in the radial direction of the output shaft 2.

[0346] In the above technical solution, by fitting the first shock absorber 801 and the second shock absorber 802 onto the mounting component 70, and optimizing the assembly relationship between the first shock absorber 801, the second shock absorber 802, the attachment part 301, the mounting component 70, and the housing 1, the mounting component 70 and the attachment part 301 of the auxiliary handle 30 are separated. This can dampen the auxiliary handle 30 in the axial and radial directions of the output shaft 2, effectively reducing the vibration transmitted from the auxiliary handle 30 to the user's arm.

[0347] Of course, the mounting component 70 is not limited to only fitting the first damping component 801 and the second damping component 802. A third damping component (not shown in the figure) can also be fitted on it. The third damping component is sandwiched between the mounting component 70 and the hole wall of the first mounting part 1a. The third damping component is used to reduce the vibration transmitted from the hole wall of the first mounting part 1a to the mounting component 70.

[0348] In one embodiment, as shown in Figures 34 and 35, the mounting component 70 is a fastener (such as a bolt), which has a simple structure and is easy to assemble.

[0349] In one embodiment, both the first damping member 801 and the second damping member 802 are rubber rings. When the rubber rings are deformed by external force, they absorb some energy and thus play a damping role.

[0350] In one embodiment, as shown in Figures 34 and 35, the mounting member 70 includes a connected end cap 701 and a mounting rod 702. The mounting rod 702 passes through the second mounting portion 3011 and the first mounting portion 1a. The end cap 701 is located on the side of the attachment portion 301 facing away from the housing 1. A second damping portion 8012 is sandwiched between the outer wall of the attachment portion 301 and the end cap 701. When the tool body vibrates radially along the output shaft 2, the mounting member 70 vibrates axially along the second mounting portion 3011. The end cap 701 frequently presses against the second damping portion 8012, thereby reducing the vibration transmitted from the end cap 701 to the outer wall of the attachment portion 301.

[0351] Furthermore, when the mounting part 70 is a fastener, the outer diameter of the end cap 701 of the corresponding model of the mounting part 70 is fixed, as shown in Figures 34 and 35. A buffer pad 703 is provided between the end cap 701 and the second shock absorber 8012. The end cap 701 presses against the second shock absorber 8012 through the buffer pad 703. In this way, by increasing the contact area between the buffer pad 703 and the second shock absorber 8012, the shock absorption effect of the second shock absorber 8012 on the auxiliary handle 30 in the radial direction of the output shaft 2 is improved.

[0352] Furthermore, as shown in Figures 34 and 36, the attachment part 301 is provided with a countersunk hole 3012, and one end of the second mounting part 3011 is located in the countersunk hole 3012. The countersunk hole 3012 is used to place the buffer pad 703 for easy assembly.

[0353] In one embodiment, as shown in Figures 34 and 35, the housing 1 includes a protruding structure 1b, a first mounting portion 1a is disposed on the protruding structure 1b, and a fourth damping portion 8022 is sandwiched between the outer wall of the attachment portion 301 and the protruding structure 1b. When the tool body vibrates radially along the output shaft 2, the protruding structure 1b presses against the fourth damping portion 8022, thereby reducing the vibration transmitted from the housing 1 to the outer wall of the attachment portion 301.

[0354] In one embodiment, as shown in Figures 33 and 34, the direction in which the second damping part 8012 is clamped and the direction in which the fourth damping part 8022 is clamped are both perpendicular to the central axis of the output shaft 2, so as to improve the damping effect of the second damping part 8012 and the fourth damping part 8022 on the auxiliary handle 30 in the radial direction of the output shaft 2.

[0355] In one embodiment, as shown in Figures 35 and 36, there are four of each of the following: the first mounting part 1a, the second mounting part 3011, and the mounting component 70. These three components are matched one-to-one, which facilitates a secure assembly of the auxiliary handle 30 with the housing 1. The first shock absorber 801 and the second shock absorber 802 constitute a set of shock-absorbing components. Four sets of shock-absorbing components are configured, with each mounting component 70 matched with one set. Each mounting component 70 is separated from the attachment part 301 by its matching shock-absorbing component, effectively damping the auxiliary handle 30. Of course, the number of the first mounting part 1a, the second mounting part 3011, the mounting component 70, and the shock-absorbing components is not limited to four; it can also be two, three, or even more.

[0356] In one embodiment, as shown in Figures 34 and 35, the first damper 801 and the second damper 802 have the same structure and size, which reduces costs and facilitates assembly.

[0357] In one embodiment, as shown in Figures 35 and 36, the auxiliary handle 30 is ring-shaped, and the handle portion 303 and the attachment portion 301 are spaced apart in the direction toward the housing 1. A through hole is formed between the handle portion 303 and the attachment portion 301 for the user's hand to pass through. The handle portion 303 extends radially along the output shaft 2 for easy gripping.

[0358] Furthermore, as shown in Figures 33, 35, and 36, the auxiliary handle 30 also includes two transition portions 302, with each end of the handle portion 303 connected to both ends of the attachment portion 301 via the two transition portions 302. The transition portions 302 extend forward or backward to offset the handle portion 303 from the middle portion of the attachment portion 301, reducing interference between the handle portion 303 and the assembly / installation component 70.

[0359] In one embodiment, as shown in Figures 32 to 35, the housing 1 includes a motor housing 12 and an output housing 13 connected sequentially in a forward direction. The motor 3 is located in the motor housing 12, and the transmission assembly 4 is located in the output housing 13. A first mounting portion 1a is provided on the output housing 13. The handle housing 11 of the power tool 100 is located at the rear end of the housing 1. Thus, there is a large gap between the auxiliary handle 30 and the handle housing 11, avoiding the concentration of the load of the power tool 100 on the handle housing 11. Further, the output housing 13 includes a head housing 131 and a gearbox 132 connected together. The transmission assembly 4 includes a planetary gear train mechanism (not shown in the figures) for speed reduction, which is housed in the gearbox 132. The first mounting portion 1a is provided on the gearbox 132.

[0360] Furthermore, as shown in Figures 33 and 35, the first mounting part 1a is positioned close to the motor housing 12, so that the vibration transmitted from the transmission assembly 4 and the motor 3 to the auxiliary handle 30 can be effectively reduced by the first shock absorber 801 and the second shock absorber 802.

[0361] In another embodiment, as shown in Figures 37 and 38, the power tool 100 includes a printed circuit board 6, a housing 1, and a motor. The housing 1 forms the outer contour structure of the power tool 100, and the printed circuit board 6 and the motor are both located inside the housing 1.

[0362] As shown in Figures 38 to 41, the printed circuit board 6 includes a PCB board body 61, a heat sink 62, multiple switches 63, and a plastic support 64. The heat sink 62 is connected to the PCB board body 61 and is used to conduct heat generated by the PCB board body 61 to the outside. The switches 63 are electrically connected to the PCB board body 61 and connected to the heat sink 62, which provides support for the switches 63. When the motor needs to be turned on, the switch 63 couples the stator coil of the motor to the power supply so that the stator coil can generate a magnetic field. When the motor needs to be turned off, the switch 63 disconnects the coupling between the stator coil and the power supply. That is, the switch 63 is used to control the start and stop of the motor. The plastic support 64 is located between the PCB board body 61 and the heat sink 62. The plastic support 64 supports the heat sink 62 and insulates and separates the PCB board body 61 from the heat sink 62.

[0363] In the above technical solution, a plastic support 64 is provided between the PCB board 61 and the heat sink 62. The plastic support 64 serves as insulation to prevent short circuits. Furthermore, the plastic support 64 supports the heat sink 62. If the heat sink 62 is deformed due to compression, the plastic support 64 is not easily deformed and can absorb stress, thus preventing the PCB board 61 from bending due to the deformation of the heat sink 62. In addition, the heat sink 62 also provides support for the switch 63, reducing the stress on the switch 63 and preventing the switch 63 from falling off due to vibration or compression.

[0364] In one embodiment, as shown in Figures 38 to 40, the switch 63 and the heat sink 62 are connected by a first fastener 651 (such as a screw or rivet), which allows for quick assembly and a secure connection.

[0365] Further, as shown in Figures 38 to 40, the heat sink 62 includes a first side arm 621 and a second side arm 622 disposed opposite to each other. A portion of the switches 63 are connected to the outer side of the first side arm 621, and a portion of the switches 63 are connected to the outer side of the second side arm 622. The first side arm 621 and the second side arm 622 serve both for heat transfer and for mounting and supporting the switches 63. Distributing the multiple switches 63 and mounting them separately on the first side arm 621 and the second side arm 622 facilitates balanced force distribution on the heat sink 62. Furthermore, both the first side arm 621 and the second side arm 622 extend in a direction perpendicular to the PCB board 61.

[0366] In one embodiment, as shown in Figures 40 to 42, the plastic support 64 includes a first support arm 641, a connecting arm 642, and a second support arm 643 connected in sequence. The first support arm 641 and the second support arm 643 are spaced apart and connected by the connecting arm 642. The shape of the plastic support 64 includes, but is not limited to, a U-shape, a C-shape, a V-shape, or a W-shape. The heat sink 62 is supported on the first support arm 641 and the second support arm 643, which reduces the obstruction of the PCB board 61 by the heat sink 62 and facilitates the rapid transfer of heat generated by the PCB board 61 through the plastic support 64 to the heat sink 62, thereby improving heat dissipation efficiency.

[0367] Further, as shown in Figures 40 and 42, the heat sink 62 includes a first leg 623 and a second leg 624. The first leg 623 is supported by a first support arm 641, and the surface of the first support arm 641 facing away from the first leg 623 abuts against the PCB board 61. The second leg 624 is supported by a second support arm 643, and the surface of the second support arm 643 facing away from the second leg 624 abuts against the PCB board 61. In this design, the bottom of the heat sink 62 is configured with the first leg 623 and the second leg 624, which helps to improve the heat exchange rate between the PCB board 61 and the heat sink 62, thus accelerating heat dissipation.

[0368] Furthermore, as shown in Figure 40, the first leg 623, the first support arm 641 and the PCB board 61 are connected by the second fastener 652 (such as screws or rivets), and the second leg 624, the second support arm 643 and the PCB board 61 are connected by the third fastener 653 (such as screws or rivets) to connect the heat sink 62, the plastic support 64 and the PCB board 61 in sequence, so that the assembly is quick and stable. Specifically, as shown in Figures 40 to 42, the first support leg 623 is provided with a first fastening hole 6231, the first support arm 641 is provided with a first clearance through hole 6411, and the PCB board 61 is provided with a second fastening hole (not shown in the figure). The second fastener 652 passes through the second fastening hole, the first clearance through hole 6411 and the first fastening hole 6231 in sequence to achieve fastening. The second support leg 624 is provided with a third fastening hole 6241, the second support arm 643 is provided with a second clearance through hole 6431, and the PCB board 61 is provided with a fourth fastening hole (not shown in the figure). The third fastener 653 passes through the fourth fastening hole, the second clearance through hole 6431 and the third fastening hole 6241 in sequence to achieve fastening, thereby assembling the heat sink 62, the plastic support 64 and the PCB board 61 together.

[0369] Furthermore, in order to improve the stability of the assembly of the heat sink 62, the plastic support 64 and the PCB board 61, the first leg 623, the first support arm 641 and the PCB board 61 are connected by three second fasteners 652, and the second leg 624, the second support arm 643 and the PCB board 61 are connected by three third fasteners 653.

[0370] Furthermore, as shown in Figure 42, the cross-sectional dimensions of the first clearance through-hole 6411 and the second clearance through-hole 6431 can be as large as possible. In this way, some of the heat generated by the PCB board 61 can be transferred to the heat sink 62 through the first clearance through-hole 6411 and the second clearance through-hole 643, which is beneficial to accelerate the heat dissipation of the PCB board 61.

[0371] In one embodiment, as shown in Figures 38, 40, and 41, the heat sink 62 further includes a connecting rib 625 and an extension arm 626. The connecting rib 625 is located between the first side arm 621 and the second side arm 622, and its two ends are connected to the first side arm 621 and the second side arm 622, respectively. The extension arm 626 is connected to the connecting rib 625 and extends along the length of the first side arm 621. Some of the switches 63 can also be connected to the extension arm 626. The extension arm 626 increases the heat exchange area of ​​the heat sink 62 and increases the number of switches 63 that can be installed on the heat sink 62. In a specific embodiment, as shown in Figure 38, the number of switches 63 is seven: three switches 63 are connected to the first side arm 621, three switches 63 are connected to the second side arm 622, and one switch 63 is connected to the extension arm 626.

[0372] Further, as shown in Figures 38 and 40, the inner surface of the first side arm 621 is provided with multiple first heat dissipation fins 6211, which extend toward the second side arm 622 and away from the PCB board 61. The inner surface of the second side arm 622 is provided with multiple second heat dissipation fins 6221, which extend toward the first side arm 621 and away from the PCB board 61. The connecting rib 625 is arranged parallel to the PCB board 61 and is provided with multiple third heat dissipation fins 6251, which extend in a direction perpendicular to the PCB board 61. This solution improves the heat dissipation performance of the heat sink 62 by optimizing the extension direction of each heat dissipation fin.

[0373] In one embodiment, the plastic support 64 is made of nylon. Nylon has high mechanical strength, good electrical insulation, and is not prone to stress deformation, thus better protecting the PCB board 61 and the switch 63.

[0374] In one embodiment, as shown in FIG42, the plastic support 64 has a cutout portion 644 on the side facing the PCB board 61. The heat dissipation channel formed between the cutout portion 644 and the PCB board 61 is beneficial to accelerate the heat dissipation of the PCB board 61.

[0375] In one embodiment, the PCB board 61 and the plastic support 64 are positioned and pre-assembled by means of positioning protrusions and positioning holes. Specifically, as shown in FIG42, the bottom wall of the plastic support 64 is provided with multiple positioning protrusions 645, and the PCB board 61 is provided with multiple positioning holes (not shown in the figure). The positioning protrusions 645 and the positioning holes are arranged one-to-one. When assembling the PCB board 61 and the plastic support 64, the positioning protrusions 645 are aligned with the positioning holes and inserted, and then the PCB board 61 and the plastic support 64 are connected by the second fastener 652 and the third fastener 653. Of course, the positioning and pre-assembly structure of the PCB board 61 and the plastic support 64 is not limited to this. Positioning protrusions can also be provided on the PCB board 61 and positioning holes can be provided on the plastic support 64. Preferably, since the PCB board 61 is easier to drill holes in, positioning protrusions 645 are provided on the bottom wall of the plastic support 64 and positioning holes are provided on the PCB board 61 to achieve positioning and pre-assembly of the two.

[0376] In one embodiment, as shown in FIG40, the switch 63 is plugged into the PCB board 61 via pin 631, which is convenient for assembly.

[0377] In one embodiment, as shown in Figures 38 to 41, the printed circuit board 6 further includes a base 66. The PCB board 61 is mounted in the base 66 by a fourth fastener 654. The PCB board 61, the switch 63, and the plastic support 64 are all located in the base 66. The base 66 can play a protective role to prevent damage to electronic components during transportation or storage.

[0378] In one embodiment, the switch 63 is selected from any one of a field-effect transistor, a bipolar junction transistor, an insulated gate bipolar transistor, a gate turn-off thyristor, a MOS-controlled thyristor, an integrated gate commutated thyristor, and an electron injection enhancement gate transistor.

[0379] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A power tool, characterized in that, The power tool includes: A motor housing for housing a motor, wherein one end of the motor housing is provided with a plurality of assembly parts extending in a direction perpendicular to the motor axis, and at least two of the assembly parts are provided on both sides of the motor axis; A handle housing extends along the axis of the motor housing, one end of the handle housing is connected to the assembly part, and the other end is a free end for the operator to grip. The handle housing includes two handle covers that cover the assembly part, and the two handle covers have abutting portions that are connected to the assembly part. An elastic element is located between the abutting portion and the assembly portion; A connecting component extends through the abutment, the assembly, and the elastic member, and locks the elastic member between the abutment and the assembly.

2. The power tool according to claim 1, characterized in that, The handle housing includes a second half-shell and a first half-shell, and the second half-shell and the first half-shell respectively form two handle covers; The elastic element includes a first elastic element and a second elastic element. The first elastic element is connected between the second half-shell and the assembly part, and the second elastic element is connected between the first half-shell and the assembly part.

3. The power tool according to claim 2, characterized in that, The motor housing is provided with a first mounting post, the second half-shell is provided with a second mounting post, and the first half-shell is provided with a third mounting post. The connecting assembly is simultaneously inserted into the first mounting post, the second mounting post, and the third mounting post, so that the second half-shell and the first half-shell are connected to the motor housing.

4. The power tool according to claim 3, characterized in that, The second mounting post is connected to the third mounting post.

5. The power tool according to claim 4, characterized in that, The first elastic element is a first elastic ring, which is sleeved on the second mounting post and abuts against the assembly part, the second mounting post and the second half shell; The second elastic element is a second elastic ring, which is sleeved on the third mounting post and abuts against the assembly part, the third mounting post and the first half shell.

6. The power tool according to claim 3, characterized in that, The second mounting post and the third mounting post are spaced apart.

7. The power tool according to claim 6, characterized in that, The first elastic element is a third elastic ring, which is sleeved on the connecting component and the second mounting post, and abuts against the assembly part, the connecting component, the second mounting post and the second half shell; The second elastic element is a fourth elastic ring, which is sleeved on the connecting assembly and the third mounting post, and abuts against the assembly part, the connecting assembly, the third mounting post and the first half-shell.

8. The power tool according to claim 7, characterized in that, The fourth elastic ring is provided with a first ring and a second ring, the first ring being connected to the second ring, the inner diameter of the first ring matching the outer diameter of the connecting component, and the inner diameter of the second ring matching the outer diameter of the third mounting post.

9. The power tool according to claim 8, characterized in that, The first half-shell is also provided with a first receiving groove for receiving the second ring. The outer diameter of the second ring matches the first receiving groove, and the first receiving groove and the third mounting post form the abutment portion.

10. The power tool according to claim 9, characterized in that, The motor housing is provided with a second receiving groove for accommodating the first ring. The outer diameter of the first ring matches the second receiving groove, and the second receiving groove forms the assembly part.

11. A power tool, characterized in that, The power tool includes: An electric motor, which includes a rotor shaft; A power mechanism, including a transmission assembly, which includes a planetary carrier; A gearbox for housing the transmission assembly and having a through hole; the motor is located outside the gearbox, and the rotor shaft passes through the through hole to engage with the input end of the transmission assembly. The front bearing includes an outer bearing ring and an inner bearing ring, the outer bearing ring being sealed to the gearbox, and the inner bearing ring being fitted around the outer periphery of the front end of the rotor shaft; An auxiliary support bearing is located in front of the front bearing and connected to the planetary carrier. The auxiliary support bearing is sleeved on the rotor shaft with a clearance fit between the two. A shock-absorbing sealing sleeve is located between the front bearing and the auxiliary support bearing, and is fitted onto the rotor shaft with an interference fit. The rear end of the shock-absorbing sealing sleeve abuts against the front bearing to seal the assembly gap between the bearing inner ring and the rotor shaft. When the power tool is in operation, the power mechanism and the motor will move back and forth. During the forward and backward movement of the power mechanism, the auxiliary support bearing can move back and forth with the transmission assembly and squeeze the shock-absorbing sealing sleeve, and the shock-absorbing sealing sleeve absorbs part of the rearward impact force generated by the power mechanism. During the forward and backward movement of the motor, the shock-absorbing sealing sleeve can press against the auxiliary support bearing as the rotor shaft moves back and forth, and the shock-absorbing sealing sleeve absorbs part of the forward impact force generated by the motor.

12. The power tool according to claim 11, characterized in that, When the power tool is in its initial state, there is a gap between the front end of the shock-absorbing sealing sleeve and the auxiliary support bearing; The clearance is configured such that, during operation of the power tool, the auxiliary support bearing and the shock-absorbing seal can collide and press against each other.

13. The power tool according to claim 12, characterized in that, The gap is less than 2 mm in the front-to-back direction.

14. The power tool according to claim 11, characterized in that, The shock-absorbing sealing sleeve includes a protrusion and a recess, which are distributed sequentially in the front-to-back direction.

15. The power tool according to claim 14, characterized in that, The number of at least one of the protrusions and the recesses is greater than or equal to two, and the protrusions and the recesses are alternately distributed in the front-back direction.

16. The power tool according to any one of claims 11-15, characterized in that, The power mechanism includes a main shaft, and the output end of the planetary carrier is driven by the main shaft.

17. The power tool according to claim 16, characterized in that, The main shaft and the planetary carrier are integrally formed.

18. The power tool according to any one of claims 11-15, characterized in that, The rear side wall of the gearbox is provided with a mounting groove, the through hole passes through the mounting groove, the mounting groove is provided with a retaining groove for engaging a sealing ring, and the outer ring of the bearing is engaged in the mounting groove.

19. The power tool according to claim 18, characterized in that, The rear end of the shock-absorbing sealing sleeve extends into the through hole, and the two are fitted with a clearance.

20. The power tool according to any one of claims 11-15, characterized in that, The planetary carrier is provided with a sleeve hole, and the auxiliary support bearing is engaged in the sleeve hole with an interference fit. And / or, the shock-absorbing sealing sleeve is a rubber component.

21. A power tool, characterized in that, The power tool includes: An electric motor, which includes a rotor shaft; A rear bearing, which is fitted onto the rear part of the rotor shaft; The motor housing is cylindrical to house the motor. A bearing chamber is formed on one side of the bottom wall of the motor housing, which houses the rear bearing. A first connecting structure is provided on the other side of the bottom wall. The handle housing has a grip portion and a second connecting structure; An elastic element is provided, wherein the first connecting structure is connected to the second connecting structure through the elastic element, and the elastic element is clamped.

22. The power tool according to claim 21, characterized in that, The power tool further includes a connecting component, wherein the first connecting structure has a first mounting hole and the second connecting structure has a second mounting hole; the connecting component mates with the first mounting hole and the second mounting hole to connect the first connecting structure and the second connecting structure; the axis of the connecting component is perpendicular to the axis of the motor.

23. The power tool according to claim 22, characterized in that, The elastic element is sleeved around the outer periphery of the connecting assembly, and the two are interference-fitted.

24. The power tool according to claim 22, characterized in that, The second connection structure includes a column portion and an annular extension portion. The second mounting hole is provided on the column portion. The annular extension portion is arranged around the column portion and an annular groove is formed between the two. The elastic element includes a second ring and a connecting portion connected in sequence in the radial direction of the motor. The second ring engages with the annular groove to provide axial vibration damping for the handle housing; the outer end face of the second ring abuts against the bottom wall of the annular groove along the radial direction of the motor, and the connecting portion abuts against the end of the column portion along the radial direction of the motor to provide radial vibration damping for the handle housing.

25. The power tool according to claim 24, characterized in that, The inner wall of the second ring is provided with a first concave-convex surface, which abuts against the outer wall of the column part in the axial direction of the motor.

26. The power tool according to claim 25, characterized in that, The first concave-convex surface has a sawtooth structure.

27. The power tool according to any one of claims 22-26, characterized in that, The elastic element includes a connecting portion and a first ring connected in sequence in the radial direction of the motor, and the first connecting structure is provided with a groove; The first ring engages with the groove to provide axial shock absorption for the handle housing; the outer end face of the first ring abuts against the bottom wall of the groove along the radial direction of the motor, and the connecting part abuts against the outer end face of the elastic member along the radial direction of the motor to provide radial shock absorption for the handle housing.

28. The power tool according to claim 27, characterized in that, The outer wall of the first ring is provided with a second concave-convex surface, which abuts against the groove wall of the groove in the axial direction of the motor.

29. The power tool according to claim 28, characterized in that, The second concave-convex surface has a sawtooth structure.

30. The power tool according to claim 27, characterized in that, The handle housing includes a second half-shell and a first half-shell, and the second half-shell and the first half-shell are respectively provided with a second connecting structure; The second connecting structure of the second half-shell, an elastic element, the first connecting structure, another elastic element, and the second connecting structure of the first half-shell are distributed in sequence along the radial direction of the motor and locked together by the connecting assembly.

31. A power tool, characterized in that, The power tool has an output torque greater than or equal to 2000 N·m, and the power tool includes: An electric motor, which includes a rotor shaft; The transmission assembly includes planetary gears, an internal gear ring, a planet carrier, and a sun gear formed at the front end of the rotor shaft; The front bearing and the rear bearing are respectively fitted onto the outer circumference of the rotor shaft and are located on the front and rear sides of the main body housing of the motor. An auxiliary support bearing is sleeved on the outer circumference of the rotor shaft and located between the sun gear and the front bearing; A gearbox for housing the transmission assembly, wherein the maximum distance between the central axis of the gearbox and its outer wall is less than or equal to 60 mm.

32. The power tool according to claim 31, characterized in that, One end of the planetary carrier is provided with an axially extending cavity and a radially extending first mounting groove. The planetary gear is mounted in the first mounting groove, and the front end of the rotor shaft is inserted into the cavity and meshes with the planetary gear.

33. The power tool according to claim 32, characterized in that, The auxiliary support bearing is mounted on the planetary carrier.

34. The power tool according to claim 33, characterized in that, The auxiliary support bearing is installed inside the cavity.

35. The power tool according to claim 34, characterized in that, The cavity wall is provided with a boss, and the auxiliary support bearing abuts axially against the boss.

36. The power tool according to claim 35, characterized in that, The boss is located between the first mounting groove and the auxiliary support bearing.

37. The power tool according to claim 35, characterized in that, The boss is ring-shaped.

38. The power tool according to any one of claims 31-37, characterized in that, The gearbox has a second mounting slot at its rear end, and the front bearing is mounted in the second mounting slot.

39. The power tool according to claim 38, characterized in that, The rear end surface of the gearbox has an annular protrusion, and the annular protrusion forms the second mounting groove with the rear end surface of the gearbox.

40. The power tool according to any one of claims 31-37, characterized in that, The axial dimension of the auxiliary support bearing is smaller than that of the front bearing.

41. A power tool, characterized in that, The power tool includes: case; An electric motor, which is disposed within the housing and has a rotor shaft; The transmission assembly includes a first-stage planetary gear train and a second-stage planetary gear train, wherein the rotor shaft, the first-stage planetary gear train, and the second-stage planetary gear train are sequentially coupled in transmission. Wherein, the outer diameter of the transmission assembly is ≤70mm, the length of the transmission assembly is ≤50mm, the transmission assembly is configured to provide a total reduction ratio of at least 13:1, and the maximum tightening torque of the power tool is at least 1500N·m.

42. The power tool according to claim 41, characterized in that, The power tool further includes an impact assembly, a spindle, and an output shaft located in front of the spindle. The impact assembly includes an impact block, a spring, and a first ball bearing. The impact block is sleeved on the outer periphery of the spindle. The spindle is engaged with a second-stage planetary gear train. The spindle drives the output shaft to move through the impact assembly. The outer diameter of the impact block is ≤77mm.

43. The power tool according to claim 42, characterized in that, The outer diameter of the shell is ≤105mm.

44. The power tool according to any one of claims 41-43, characterized in that, The first-stage planetary gear train includes a first sun gear, a plurality of first planetary gears, a first internal gear ring, and a first planet carrier. The first sun gear is located at the end of the rotor shaft, the first internal gear ring is mounted on the inner wall of the housing, and the first planetary gears are mounted on the first planet carrier and mesh with the first sun gear and the first internal gear ring, respectively.

45. The power tool according to claim 44, characterized in that, The second-stage planetary gear train includes a second sun gear, multiple second planetary gears, a second internal gear ring, and a second planetary carrier. The second sun gear is integrally formed on the first planetary carrier. The second internal gear ring is mounted on the inner wall of the housing. The second planetary gears are mounted on the second planetary carrier and mesh with the second sun gear and the second internal gear ring, respectively.

46. ​​The power tool according to claim 45, characterized in that, The power tool includes a spindle, and the second planetary carrier is integrally formed at the end of the spindle.

47. The power tool according to claim 45, characterized in that, The second internal gear ring abuts against the front end face of the first internal gear ring.

48. The power tool according to claim 47, characterized in that, The first planetary carrier includes a main body and a plurality of first planetary pins. The first planetary gears are mounted one by one on the first planetary pins. The second sun gear is located on the side of the main body away from the first planetary pins. The two ends of the main body extend into the first internal gear ring and the second internal gear ring, respectively.

49. The power tool according to claim 48, characterized in that, A needle roller bearing is provided between the first planetary gear and the first planetary pin.

50. The power tool according to claim 45, characterized in that, The second planetary carrier is mounted to the inner wall of the housing via rolling bearings.

51. An electric tool, characterized in that, The power tool includes: The housing includes a head housing, a gearbox, a gearbox rear cover, and a motor housing connected sequentially from front to back; An electric motor, which is located within the motor housing and includes a rotor shaft; A transmission assembly, comprising a first-stage planetary gear train and a second-stage planetary gear train in a transmission engagement, wherein the rotor shaft is in a transmission engagement with the first-stage planetary gear train; An impact assembly, located within the head shell; The gearbox has open structures at both the front and rear ends, the transmission assembly is located inside the gearbox, and the rear cover of the gearbox is installed over the rear open end of the gearbox.

52. The power tool according to claim 51, characterized in that, The power tool includes fastening screws, and the head shell, gearbox, gearbox rear cover and motor housing are connected in sequence by the fastening screws.

53. The power tool according to claim 52, characterized in that, The head shell includes a first connecting hole, the gearbox includes a second connecting hole, the gearbox rear cover includes a third connecting hole, and the motor housing includes a fourth connecting hole; The fastening screws pass through the first connecting hole, the second connecting hole, the third connecting hole, and the fourth connecting hole in sequence to make connections.

54. The power tool according to claim 52, characterized in that, The outer wall of the head shell is provided with a first protrusion, the gearbox includes a main body and a gear mounting cavity surrounded by the main body, the gearbox rear cover includes a cover body and an extension body surrounding the cover body, and the outer wall of the motor housing is provided with a second protrusion; the first protrusion, the main body, the extension body and the second protrusion abut against each other in sequence and are connected by the fastening screw.

55. The power tool according to claim 54, characterized in that, The first protrusion, the main body, the extension, and the second protrusion have the same circumferential outer contour shape.

56. The power tool according to claim 54, characterized in that, The first-stage planetary gear train includes a first internal gear ring, and the second-stage planetary gear train includes a second internal gear ring; The first internal gear ring and the second internal gear ring are engaged in the gear mounting cavity.

57. The power tool according to claim 51, characterized in that, The rear end face of the head shell is provided with a first annular protrusion, and the front end face of the gearbox is provided with a first annular groove, with the first annular protrusion inserted into the first annular groove.

58. The power tool according to claim 51, characterized in that, The rear end face of the gearbox is provided with a second annular protrusion, and the front end face of the gearbox rear cover is recessed to form a cavity, and the second annular protrusion is engaged with the cavity.

59. The power tool according to claim 58, characterized in that, The outer wall of the second annular protrusion is provided with an annular groove, and a sealing ring is engaged in the annular groove. The sealing ring is used to seal the assembly gap between the second annular protrusion and the gearbox rear cover.

60. The power tool according to claim 51, characterized in that, The power tool includes a front bearing for supporting the front portion of the rotor shaft; The rear end face of the gearbox cover is provided with a second annular groove, and the front bearing is engaged with the second annular groove.

61. A power tool, characterized in that, The power tool includes: The tool body includes a housing and an output shaft connected to the housing, the housing being provided with a first mounting portion; An auxiliary handle is located on the radial side of the output shaft and includes a handle portion and an attachment portion, the attachment portion being provided with a second mounting portion; The mounting component passes through the second mounting portion and the first mounting portion to mount the auxiliary handle onto the housing; The first damping component has a first damping part and a second damping part; The second damping component has a third damping part and a fourth damping part; In this embodiment, at least one of the mounting components is fitted with the first shock absorber and the second shock absorber. The first shock absorber and the third shock absorber are respectively sandwiched between the hole wall of the second mounting component and the mounting component. The second shock absorber is sandwiched between the outer wall of the attachment component and the mounting component. The fourth shock absorber is sandwiched between the outer wall of the attachment component and the housing.

62. The power tool according to claim 61, characterized in that, The mounting component is a fastener, and / or both the first and second shock absorbers are rubber rings.

63. The power tool according to claim 61, characterized in that, The mounting component includes a connected end cap and a mounting rod, the mounting rod passing through the second mounting portion and the first mounting portion, the end cap being located on the side of the attachment portion away from the housing, and the second shock-absorbing portion being sandwiched between the outer wall of the attachment portion and the end cap.

64. The power tool according to claim 63, characterized in that, A buffer pad is provided between the end cap and the second shock absorber, and the buffer pad is sleeved on the outer periphery of the mounting rod.

65. The power tool according to claim 61, characterized in that, The housing includes a protruding structure, the first mounting portion is disposed on the protruding structure, and the fourth shock-absorbing portion is sandwiched between the outer wall of the attachment portion and the protruding structure.

66. The power tool according to any one of claims 61-65, characterized in that, The direction in which the second damping part is clamped and the direction in which the fourth damping part is clamped are both perpendicular to the central axis of the output shaft.

67. The power tool according to any one of claims 61-65, characterized in that, The number of the first mounting part, the second mounting part, and the mounting component is at least two, and the three are matched one-to-one; The first damping component and the second damping component constitute a set of damping components, and each of the mounting components is matched with a set of damping components.

68. The power tool according to any one of claims 61-65, characterized in that, The auxiliary handle is ring-shaped, and the handle portion and the attachment portion are spaced apart in the direction toward the housing. The handle portion extends radially along the output shaft.

69. The power tool according to claim 68, characterized in that, The auxiliary handle also includes two transition portions, and the two ends of the handle portion are respectively connected to the two ends of the attachment portion through the two transition portions; The transition portion extends forward or backward so that the handle portion is offset from the middle part of the attachment portion.

70. The power tool according to any one of claims 61-65, characterized in that, The housing includes a motor housing and an output housing connected sequentially in the forward direction, and the tool body also includes a motor and a transmission assembly that are engaged in transmission. The motor is located in the motor housing, the transmission assembly is located in the output housing, and the first mounting part is disposed on the output housing.

71. A printed circuit board for power tools, characterized in that, The printed circuit board includes: PCB board; A heat sink, which is connected to the PCB board; Multiple switches are electrically connected to the PCB board and to the heat sink. The switches are used to control the start and stop of the motor of the power tool. A plastic support is located between the PCB board and the heat sink, the plastic support being used to support the heat sink and to insulate and separate the PCB board from the heat sink.

72. The printed circuit board for power tools according to claim 71, characterized in that, The switch is connected to the heat sink via a first fastener.

73. The printed circuit board for power tools according to claim 72, characterized in that, The heat sink includes a first side arm and a second side arm disposed opposite to each other, with part of the switch connected to the first side arm and part of the switch connected to the second side arm.

74. The printed circuit board for power tools according to any one of claims 71-73, characterized in that, The plastic support includes a first support arm, a connecting arm, and a second support arm connected in sequence, and the heat sink is supported on the first support arm and the second support arm.

75. The printed circuit board for power tools according to claim 74, characterized in that, The heat sink includes a first leg and a second leg, the first leg being supported by the first support arm and the second leg being supported by the second support arm.

76. The printed circuit board for power tools according to claim 75, characterized in that, The first leg, the first support arm, and the PCB board are connected by a second fastener, and the second leg, the second support arm, and the PCB board are connected by a third fastener.

77. The printed circuit board for power tools according to claim 74, characterized in that, The heat sink includes: The first side arm, part of the switch is connected to the first side arm; The second side arm, part of the switch is connected to the second side arm; A connecting rib is located between the first side arm and the second side arm, and is connected to the first side arm and the second side arm. An extension arm is connected to the connecting rib and extends along the length of the first side arm, and part of the switch is connected to the extension arm.

78. The printed circuit board for power tools according to claim 77, characterized in that, The inner surface of the first side arm is provided with a plurality of first heat dissipation fins, which extend in a direction toward the second side arm and away from the PCB board. And / or, a plurality of second heat dissipation fins are provided on the inner wall surface of the second side arm, and the second heat dissipation fins extend in a direction toward the first side arm and away from the PCB board body; And / or, the connecting rib is arranged parallel to the PCB board body, the connecting rib is provided with a plurality of third heat dissipation fins, and the third heat dissipation fins extend in a direction perpendicular to the PCB board body.

79. The printed circuit board for power tools according to any one of claims 71-73, characterized in that, The plastic support is U-shaped, C-shaped, V-shaped, or W-shaped; And / or, the plastic support is of nylon structure; And / or, the plastic support member has a cutout on the side facing the PCB board; And / or, the PCB board body and the plastic support are engaged by positioning protrusions and positioning holes to achieve positioning pre-assembly; And / or, the switch is connected to the PCB board via pins; And / or, the printed circuit board further includes a base, the PCB body is mounted in the base, and the PCB body, the switch and the plastic support are all located in the base; And / or, the switch is selected from any one of a field-effect transistor, a bipolar junction transistor, an insulated gate bipolar transistor, a gate turn-off thyristor, a MOS-controlled thyristor, an integrated gate commutated thyristor, and an electron-injected enhancement gate transistor.

80. A power tool, characterized in that, The power tool includes: case; The motor is located within the housing; The printed circuit board for power tools as described in any one of claims 71-79, wherein the printed circuit board controls the start and stop of the motor via the switch.

Images