Power tool

Abstract

The application discloses an electric tool, comprising: a housing; a motor arranged in the housing; an output shaft rotatably supported by the housing; an impact assembly accommodated in the housing, the impact assembly being capable of exerting a circumferential rotation impact force on the output shaft; and a transmission assembly accommodated in the housing and in transmission connection with the motor and the impact assembly respectively, the transmission assembly being capable of receiving a driving force of the motor and transmitting the driving force to the impact assembly so that the output shaft works externally; wherein the motor comprises a stator core and a rotor core capable of rotating relative to the stator core along an axis, the stator core has a rotation-stopping portion protruding in a radial direction, the housing has a rotation-stopping groove in abutting connection with the rotation-stopping portion, the rotation-stopping portion comprises a curved surface portion having at least one curvature and a planar portion extending along a plane, and at least one of the curved surface portion and the planar portion is capable of forming abutment with the rotation-stopping groove. The electric tool can improve the connection stability between the stator core and the motor housing.

Description

[Technical Field]

[0001] This application relates to the field of work tools technology, and in particular to an electric tool. [Background Technology]

[0002] Some power tools can output rotational force at a certain impact frequency. Common power tools that can generate impact include impact wrenches, impact screwdrivers, and impact drills. Impact wrenches are usually used to tighten or loosen bolts and nuts, impact screwdrivers are usually used to loosen or tighten screws, and impact drills are usually used for impact drilling.

[0003] Power tools consist of a motor housing, a stator core, and a rotor core. The stator core is fixed to the motor housing, and the rotor core can rotate relative to the stator core when energized. Especially in high-torque power tools, due to the interaction of the magnetic fields between the stator and rotor cores, when the rotor core rotates at high speed, particularly when the output end of the rotor core (motor shaft) experiences resistance, it generates a reverse force on the stator core. This causes the stator core to tend to move relative to the motor housing. Over time, this can lead to deformation or breakage at the connection between the stator core and the motor housing, affecting the overall lifespan of the machine. Therefore, this places high demands on the installation and fixation of the stator core and motor housing.

[0004] Therefore, it is indeed necessary to provide an improved power tool to overcome the shortcomings of the prior art. [Utility Model Content]

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide an electric tool that can improve the connection stability between the stator core and the motor housing.

[0006] The technical solution adopted by this application to solve the problem of the prior art is: an electric tool, comprising:

[0007] Motor housing;

[0008] The motor is housed within the motor housing;

[0009] The output shaft is rotatably supported on the motor housing;

[0010] An impact assembly, housed in the motor housing, is capable of applying a circumferential rotational impact force to the output shaft;

[0011] A transmission assembly is housed in the motor housing and is connected to the motor and the impact assembly respectively. The transmission assembly can receive the driving force of the motor and transmit it to the impact assembly so that the output shaft can operate externally.

[0012] The motor includes a stator core and a rotor core that can rotate relative to the stator core about an axis. The stator core has a radially protruding anti-rotation portion. The motor housing has an anti-rotation groove that abuts against the anti-rotation portion. The anti-rotation portion includes at least a curved surface portion with a curvature and a flat surface portion extending along a plane. At least one of the curved surface portion and the flat surface portion can abut against the anti-rotation groove.

[0013] In some embodiments, the anti-rotation groove includes a curved inner wall and / or a flat inner wall, wherein the curved inner wall can correspond to and cooperate with the curved surface, and the flat inner wall can correspond to and cooperate with the flat surface.

[0014] In some embodiments, at least one of the anti-rotation portions includes a curved surface portion and flat portions located on both sides of the curved surface portion.

[0015] In some embodiments, the surface area of ​​the planar portion on one side is greater than or equal to 180 mm. 2 And less than or equal to 300mm 2 .

[0016] In some embodiments, the anti-rotation portion includes a first connection hole for connection with the motor housing, and the outer contour of the curved portion is formed by rotating the endpoint of a straight line segment about a fixed point, the fixed point being approximately coincident with the center line of the first connection hole.

[0017] In some embodiments, the motor housing is provided with a second connection hole, and the first connection hole can be bolted to the second connection hole to fix the stator core to the motor housing.

[0018] In some embodiments, the anti-rotation part has an insulating layer, and a serrated pad is provided at the mating point between the anti-rotation part and the connector. When the serrated pad is driven to pierce the insulating layer of the anti-rotation part, the serrated pad can be electrically connected to the anti-rotation part, and the serrated pad is connected to a wire.

[0019] In some embodiments, the stator core includes a stator core body, the anti-rotation portion is disposed on the outer wall of the stator core body, the maximum distance between the anti-rotation portion and the axis is defined as A, the maximum distance between the stator core body and the axis is defined as B, and the ratio of A to B is: A / B is greater than or equal to 1.1 and less than or equal to 1.4.

[0020] In some embodiments, the stator core is formed by stacking a plurality of stator laminations, and the stator core includes a conductive structure that connects the respective stator laminations to form an equipotential body.

[0021] In some embodiments, the maximum torque output by the output shaft is not less than 1200 N·m.

[0022] In some embodiments, three anti-rotation parts are provided, and the three anti-rotation parts can be arranged symmetrically about the axis.

[0023] This application also provides an electric tool, comprising:

[0024] The motor housing has a first connecting and limiting part;

[0025] The motor is housed within the motor housing;

[0026] The output shaft is rotatably supported on the motor housing;

[0027] An impact assembly, housed in the motor housing, is capable of applying a circumferential rotational impact force to the output shaft;

[0028] A transmission assembly is housed in the motor housing and is connected to the motor and the impact assembly respectively. The transmission assembly transmits power from the motor to the impact assembly to enable the output shaft to operate externally.

[0029] The motor includes a stator core and a rotor core. The stator core includes a second connecting limiting part. The first connecting limiting part can restrict the movement of the second connecting limiting part, thereby limiting the rotation of the stator core relative to the motor housing.

[0030] The second connecting limiting portion includes a curved surface and a flat surface on its outer surface, at least one of which can abut against the first connecting limiting portion.

[0031] In some embodiments, the curvature of any two local surfaces in the curved surface is the same.

[0032] In some embodiments, the curvature of any two local surfaces in the curved surface is different.

[0033] This application also provides an electric tool, comprising:

[0034] The motor housing has a first connecting and limiting part;

[0035] An electric motor is disposed within the motor housing. The motor includes a stator core and a rotor core that can rotate relative to the stator core. The stator core includes a second connecting limiting part. When the first connecting limiting part is connected to the second connecting fiber cloth, it can restrict the movement of the second connecting limiting part, thereby limiting the rotation of the stator core relative to the motor housing.

[0036] The second connecting and limiting portion includes a curved surface and a flat surface on its outer surface, at least one of which is capable of abutting against the first connecting and limiting portion.

[0037] The output shaft is rotatably supported on the motor housing. The output shaft can receive the driving force of the motor and output power to the outside.

[0038] Compared with the prior art, this application has the following beneficial effects:

[0039] This application increases the contact area between the anti-rotation part of the stator core and the motor housing by setting the anti-rotation part of the stator core as curved and flat surfaces, thereby improving the support capacity of the motor housing for the stator core. When the stator core is subjected to the magnetic field force from the rotor core and tends to move relative to the motor housing, the pressure per unit contact area between the motor housing and the anti-rotation part is relatively smaller due to the increased contact area. This makes the connection between the motor housing and the anti-rotation part less prone to deformation or damage, thus ensuring the service life of the entire machine. [Image Description]

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0041] Figure 1 This is a three-dimensional schematic diagram of the power tool of the present invention;

[0042] Figure 2 yes Figure 1 A top view of the power tool shown;

[0043] Figure 3 yes Figure 1 A cross-sectional schematic diagram of the power tool shown; Figure 4 yes Figure 1 An exploded schematic diagram of the power tools shown;

[0044] Figure 5 yes Figure 1 The diagram shows the connection between the power tool handle housing and the motor housing.

[0045] Figure 6 yes Figure 1 A cross-sectional view of the connection between the power tool handle housing and the motor housing shown in the figure;

[0046] Figure 7 yes Figure 1 The diagram shows the connection between the motor housing of the power tool and the shock absorber.

[0047] Figure 8 yes Figure 1 A schematic diagram showing the connection of the power tool handle housing, motor housing, and elastic element;

[0048] Figure 9 yes Figure 1 A cross-sectional schematic diagram of the power tool handle housing, motor housing, and elastic element shown in the figure;

[0049] Figure 10 This is a cross-sectional schematic diagram of another embodiment of the power tool handle housing, motor housing, and elastic element of the present invention;

[0050] Figure 11 yes Figure 1 The diagram shows the structural schematics of the power tool transmission assembly and impact assembly.

[0051] Figure 12 This is a schematic diagram of another embodiment of the power tool transmission assembly and impact assembly of the present invention;

[0052] Figure 13 yes Figure 1 A schematic diagram showing the connection of the power tool's stop, output housing, and output shaft.

[0053] Figure 14 yes Figure 1 A schematic diagram of the structure of the power tool's baffle and output housing shown in the figure;

[0054] Figure 15 yes Figure 13 The diagram shows a cross-sectional view of the power tool's stop, output housing, and output shaft.

[0055] Figure 16 This is a cross-sectional schematic diagram of another embodiment of the power tool partition, output housing, and output shaft of the present invention;

[0056] Figure 17 This is a cross-sectional schematic diagram of another embodiment of the power tool partition, output housing, and output shaft of the present invention;

[0057] Figure 18 This is a schematic diagram of the structure of the power tool capacitor assembly of the present invention, which includes three capacitors;

[0058] Figure 19 This is a schematic diagram of the structure of the power tool capacitor assembly of the present invention, including a single capacitor;

[0059] Figure 20 This is a schematic diagram of the structure of the power tool capacitor assembly of this application, which includes three capacitors;

[0060] Figure 21 This is a schematic diagram of the structure of the power tool capacitor assembly of this application, including a single capacitor;

[0061] Figure 22 This is another embodiment of the power tool described in this application;

[0062] Figure 23 This is a three-dimensional structural diagram of the stator of the power tool in this application;

[0063] Figure 24This is a top view of the stator structure of the power tool of this application;

[0064] Figure 25 This is a structural schematic diagram of the power tool motor and motor housing of this application;

[0065] Figure 26 yes Figure 25 Enlarged view of section F in the middle.

[0066] Meaning of the reference numerals in the diagram:

[0067] 100. Power tools;

[0068] 1. Shell,

[0069] 11. Handle housing; 11a. First half-shell; 11b. Second half-shell; 111. Grip part; 112. Cavity part; 113. First connecting part; 114. First through hole; 115. Abutment part; 116. Support protrusion; 117. AC power cord; 118. Switch.

[0070] 12. Motor housing; 121. Second connecting part; 122. Second through hole; 123. Mounting groove; 124. Anti-rotation groove; 1241. Curved inner wall; 1242. Flat inner wall.

[0071] 13. Output housing; 13a. Cylindrical section; 13b. Reduced diameter section; 131. Front housing portion; 132. Intermediate housing portion; 132a. Mounting protrusion; 133. Second limiting part; 134. Rib; 135. Third limiting part.

[0072] 2. Output shaft, 21. Output section, 22. Receiver section

[0073] 3. Motor; 31. Stator; 311. Winding; 312. Lead wire; 313. Stator core; 314. Anti-rotation part; 3141. First connecting hole; 3142. Curved surface part; 3143. Flat surface part; 315. Connector; 316. Serrated washer; 3161. Conductor; 317. End face; 318. Insulating component; 319. Center line; 320. Shaft centerline; 321. Conductive structure; 322. Rotor core; 323. Motor shaft.

[0074] 4. Transmission Components: 41. Sun Gear; 42. Internal Ring Gear; 43. Compound Planetary Gear; 431. First Tooth Section; 432. Second Tooth Section; 44. Planet Carrier; 45. First-Stage Sun Gear; 46. First-Stage Internal Ring Gear; 47. First-Stage Planetary Gear; 48. First-Stage Planet Carrier; 49. Second-Stage Sun Gear; 410. Second-Stage Internal Ring Gear; 420. Second-Stage Planetary Gear; 430. Second-Stage Planet Carrier.

[0075] 5. Impact assembly; 51. Impact block; 52. Steel ball; 53. Spring; 54. Spindle.

[0076] 6. Control components,

[0077] 7. Capacitor assembly,

[0078] 8. Connecting components; 81. First connecting element; 82. Second connecting element;

[0079] 9. Shock absorber components; 91. First rotation; 92. Second rotation.

[0080] 10. Elastic components,

[0081] 20. Partition; 201. Central through hole; 202. First limiting part.

[0082] 30. Secondary handle; 301. Mounting part; 302. Transition part; 303. Handle part.

[0083] 40. Bearings. [Detailed Implementation]

[0084] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0085] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the application. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the application.

[0086] In the embodiments of the power tool 100 of this application, the power tool 100 may be a power tool such as an electric drill, electric wrench, electric hammer, electric pick, reciprocating saw, screwdriver, electric shears, polishing machine, electric chainsaw, grinder, etc. Of course, it may also be other power tools, which will not be listed here.

[0087] See Figures 1-4As shown, the power tool 100 disclosed in this application may include a housing 1 that forms its outer contour, an output shaft 2 that is rotatably supported on the housing 1 and protrudes from one end of the housing 1, and a motor 3 and a power mechanism housed inside the housing 1. The power mechanism may include a transmission component 4 composed of a gear train and an impact component 5 composed of a striking block and a spring. The power mechanism may also include the transmission component 4 or the impact component 5 separately. Of course, the power mechanism may also be other types of transmission components for transmitting the power of the motor 3 to the output shaft 2.

[0088] To facilitate a clear explanation of the specific content of the technical solution of this application, the following definitions are made: the central axis of the output shaft 2 and the direction parallel to it are defined as the axial direction; the radial direction of the circumference with the central axis of the output shaft 2 as the central axis is defined as the radial direction; the output direction of the output shaft 2 is defined as the forward direction; and the direction opposite to the output direction of the output shaft 2 is defined as the rearward direction.

[0089] See Figure 1 The housing 1 may include a handle housing 11, a motor housing 12, and an output housing 13. The handle housing 11 has a grip portion 111 for the operator to hold; this grip portion 111 may be generally D-shaped, or it may be any other shape convenient for the operator to hold. The motor housing 12 houses the motor 3 that provides power to the power tool 100; the motor 3 may be a brushless motor or a brushed motor. The output housing 13 houses the power mechanism and the output shaft 2, which is driven by the motor 3 via the power mechanism to operate externally.

[0090] like Figure 1 As shown, the power tool 100 disclosed in this application has its handle housing 11, motor housing 12, and output housing 13 arranged sequentially from back to front in a roughly straight line shape. That is, the output housing 13 is located at the front end of the motor housing 12, while the handle housing 11 extends from the rear end of the motor housing 12 in the opposite direction to the output housing 13. Of course, the housing 1 can also have a roughly gun-shaped or other shapes, and the specific shape of the housing 1 is not limited to this.

[0091] The handle housing 11 is approximately D-shaped and can be formed by two roughly symmetrical plastic half-shells 11a and 11b overlapping each other. The rear end of the handle housing 11 can be formed by the two half-shells together to create a grip portion 111 for the operator to hold. The handle housing 11 also has a cavity 112 located in front of the grip portion 111. This cavity 112 houses the control component 6 that controls the operation of the motor 3 and the capacitor component 7 electrically connected to the control component 6. The capacitor component 7 can be a single-capacitor structure or a multi-capacitor structure. The handle housing 11 also has a first connecting portion 113 located in front of the cavity 112, which is used to connect to the motor housing 12.

[0092] The motor housing 12 is generally cylindrical and can be integrally molded from plastic or formed by two half-shells fitted together. The rear end of the motor housing 12 is used to connect to the handle housing 11, and the front end is used to connect to the output housing 13. The stator of the motor 3 is circumferentially fixed and housed inside the motor housing 12, and the rotor of the motor 3 is axially rotatably supported in the middle of the stator. A second connecting part 121 is formed at the rear end of the motor housing 12 for cooperating with the first connecting part 113. The second connecting part 121 can be integrally injection molded with the motor housing 12, or it can be connected and fixed in other ways. In the power tool 100, the motor 3 can be specifically implemented as a brushless motor. To make the power tool 100 compact, such as... Figure 12 , Figure 14 As shown, the diameter D1 of the motor 3 is defined to be greater than or equal to 60 mm, and its length L0 is less than or equal to 160 mm. It has a stator 31, which includes a winding 311 and a lead wire 312 connected at one end to the winding 311. The other end of the lead wire 312 extends rearward from the stator 31 to the aforementioned handle housing 11, wherein the outer diameter D5 of the stator is greater than or equal to 60 mm.

[0093] The motor 3 in the power tool 100 can be powered by AC power. An AC power cord can be provided at the lower end of the grip portion 111 of the handle housing 11, one end of which can be connected to a plug for connection to mains power to obtain electrical energy. The control component housed in the handle housing 11 has a rectifier circuit, and the AC power cord is electrically connected to the rectifier circuit. The other end of the rectifier circuit is electrically connected to the aforementioned lead wire, thereby converting the AC power obtained from the AC power cord into DC power usable by the motor 3. A switch 118 is also provided in the grip portion 111 of the handle housing 11, which is electrically connected to the aforementioned control component 6, thereby controlling the on / off state of the circuit that provides power to the motor 3. For ease of operation, the switch 118 can be specifically implemented as a trigger switch, and the operator controls the on / off state of the circuit by pushing the switch backward. Figure 3 , Figure 5 , Figure 6As shown, in the power tool 100 disclosed in this application, the front end of the handle housing 11 is open, and the rear end of the motor housing 12 is inserted into the opening, allowing the motor housing 12 to be partially housed within the handle housing 11, so that their axial projections overlap. Setting the length L7 of the overlapping portion between 40mm and 60mm not only ensures a stable connection but also considers production economy. The first half-shell 11a and the second half-shell 11b sandwich the motor housing 12 in the middle, and the second connecting portion 121 on the motor housing 12 consists of three protrusions extending axially rearward from the motor housing 12. The line connecting the three protrusions is parallel to the joint surface of the first half-shell 11a and the second half-shell 11b. The inner walls of both the first half-shell 11a and the second half-shell 11b have first connecting portions 113 extending radially inward, which are radially opposite to the second connecting portions 121. The second connecting portions 121 and the first connecting portions 113 distributed on both sides are connected by a connecting assembly 8.

[0094] The connecting assembly 8 includes a first connecting member 81 disposed on the first half-shell 11a and a second connecting member 82 disposed on the second half-shell 11b. The first connecting member 81 may be specifically implemented as a bolt, and the second connecting member 82 may be specifically implemented as a nut, and of course, the two can be interchanged. The first half-shell 11a has a first through hole 114 coaxially arranged with the first connecting part 113, and the second connecting part 121 has a second through hole 122 radially opposite to the first through hole 114. The inner wall of the second half-shell 11b has a nut coaxially arranged with the first connecting part 113. When assembling the handle housing 11 and the motor housing 12, the bolts are inserted into the first through hole 114 and the second through hole 122 in a direction perpendicular to the axial direction from the outside. Then, the external threads on the bolts and the internal threads on the nuts are engaged to connect. In this way, the first half-shell 11a and the second half-shell 11b can be fastened together to form the handle housing 11, or the handle housing 11 and the motor housing 12 can be fixedly connected by the bolts and the engagement of the first connecting part 113 and the second connecting part 121, so that the first half-shell 11a and the second half-shell 11b clamp the motor housing 12 in the middle. Alternatively, the nut can be omitted, and the internal thread that mates with the bolt's external thread can be directly formed in the second half-shell 11b. This arrangement can also fasten the first half-shell 11a and the second half-shell 11b. However, compared to the second half-shell 11b, which is made of plastic, the nut made of metal has a higher hardness and durability. In addition, to simplify the process, the nut and the second half-shell 11b can be injection molded as a single piece.

[0095] Taking into account factors such as ease of use and economic efficiency of production of the power tool 100 disclosed in this application, the length L4 from the rear end of the motor housing to the front end of the output housing is set to be less than or equal to 380mm. This allows the length of the housing 1 to be shortened as much as possible after the housing 1 accommodates the necessary structural components of the power tool 100, making it easier to move and operate the power tool 100.

[0096] Furthermore, considering the aesthetics and structural adaptability of the power tool 100, the length from the rear end to the front end of the handle housing 11 can be defined as L1. For example... Figure 21 As shown, for a design where a single capacitor is housed within the handle housing 11, L1 can be set to be less than or equal to 185 mm. For example... Figure 20 As shown, for a design that houses multiple capacitors within the handle housing 11, L1 can be set to less than or equal to 220 mm. The length from the rear end of the motor housing 12 to the front end of the intermediate housing portion 132 is defined as L2, and the ratio between L1 and L2 is between 0.9 and 1.3. This arrangement not only ensures complete fit of the functional components housed within each housing but also provides a more harmonious proportion in terms of the length ratio between the housings. Furthermore, as... Figure 1 , Figure 2 As shown, the D-shaped grip portion 111 of the handle housing 11 has a length L8 that can be set between 85mm and 100mm, which not only fits the hand size of most operators, but also fits the size of components such as the control components 6 of the power tool 100.

[0097] See Figure 3 , Figure 5 , Figure 6 , Figure 7 The power tool 100 disclosed in this application also includes a shock absorber 9, which may be made of an elastic material. It is disposed between the handle housing 11 and the motor housing 12 to reduce vibrations transmitted from the motor housing 12 to the handle housing 11, thereby improving the operator's stability and comfort. The shock absorber 9 is disposed between the second connecting portion 121 and the first connecting portions 113 on both sides thereof. When the motor housing 12 and the handle housing 11 are connected together by the connecting assembly 8 in conjunction with the first connecting portions 113 and the second connecting portions 121, it weakens the vibration transmitted between them.

[0098] The shape, structure, and installation position of the shock absorber 9 are as follows: Figure 7As shown, it has a first ring 91 and a second ring 92 stacked vertically and integrally formed, with a through hole in the middle allowing the first connecting member 81 to pass through. The inner and outer diameters of the second ring 92 are both larger than those of the first ring 91. Six shock absorbers 9 are arranged in pairs between the first connecting part 113 and the second connecting part 121, thus forming three sets of mutually cooperating connection pairs, so that the handle housing 11 and the motor housing 12 can be connected to each other and the vibration between them can be isolated. In addition, mounting grooves 123 are recessed on both sides of the second connecting part 121. The mounting grooves 123 are approximately cylindrical notches and are coaxial with the second through hole 122. The outer diameter of the first ring 91 must be smaller than the diameter of the mounting groove 123 to ensure that the first ring 91 can be accommodated therein. The first connecting portion 113 of the handle housing 11 has a stop portion 115 extending toward the second connecting portion 121. The stop portion 115 can be specifically implemented as an annular groove structure, into which the second ring 92 is inserted, and the outer end face of the second ring 92 abuts against the inner bottom wall of the stop portion 115. Additionally, the second connecting member 82 (metal nut) disposed on the first half-shell 11a can be coaxially arranged with the stop portion 115, and the outer diameter of the second connecting member 82 is smaller than the inner diameter of the second ring 92 but larger than the inner diameter of the first ring 91. Thus, the shock absorber 9 can be supported on the second connecting member 82, and the inner end of the second connecting member 82 can abut against the inner end of the first ring 91, facilitating the positioning of the shock absorber 9 onto the handle housing 11 during assembly and simplifying the assembly process. The first connecting portion 113 on the second half-shell 11b can also be provided with a support protrusion 116 corresponding in structure and function to the second connecting member 82, serving to support the shock absorber 9 on the other side.

[0099] Based on the structure of the above technical solutions, when assembling the handle housing 1, the shock absorber 9 can be pre-positioned and supported on the second connecting member 82 (metal nut) of the first half-shell 11a and the support protrusion 116 of the second half-shell 11b. Then, the first connecting member 81 (bolt) is passed through the second half-shell 11b, one side of the shock absorber 9, the second connecting part 121, and the other side of the shock absorber 9 from the outside. The first connecting member 81 (bolt) and the second connecting member 82 (metal nut) are then threaded together. As the bolt and metal nut tighten, the abutment part 115, the end face of the metal nut, the end face of the support protrusion 116, and the inner bottom wall of the mounting groove 123 cooperate to gradually clamp the shock absorber 9. By connecting the handle housing 11 and the motor housing 12 through the above structure, the shock absorber 9 can evenly distribute the vibration generated during the operation of the power tool 100 from multiple directions, weakening the vibration transmitted to the operator and improving the operator's operational stability and comfort.

[0100] See Figure 8 , Figure 9The power tool 100 disclosed in this application also includes an elastic element 10, which is disposed in the gap between the handle housing 11 and the motor housing 12 to further reduce vibration between the handle housing 11 and the motor housing 12. The power tool 100 inevitably generates vibration during operation. When vibration is transmitted from the motor housing 12 to the handle housing 11, the shock absorber 9, clamped between the first connecting portion 113 and the second connecting portion 121, can be compressed due to its elasticity, thus providing a buffering and vibration reduction effect. The shock absorber 9 can reduce vibration at the connection between the handle housing 11 and the motor housing 12. However, since the rear end of the motor housing 12 is housed inside the handle housing 11, when the motor housing 12 directly contacts the handle housing 11, some vibration will be transmitted through the direct contact point between the two housings. Therefore, an elastic element 10 can be provided in the gap between the handle housing 11 and the motor housing 12 to reduce vibration at the direct contact point between the handle housing 11 and the motor housing 12. Furthermore, since the aforementioned shock absorber 9 is clamped by the first connecting part 113 and the second connecting part 121 during shock absorption and is further compressed to different degrees, the gap between the handle housing 11 and the motor housing 12 changes continuously. Therefore, in order to adapt to the variable gap between the handle housing 11 and the motor housing 12, the elastic member 10 is made of elastic material, so that the elastic member 10 can always simultaneously abut against the outer wall surface of the rear end of the motor housing 12 and the inner wall surface of the front end of the handle housing 11. In other words, no matter how the aforementioned variable gap changes, the elastic member 10 will also change its own degree of compression, thereby ensuring that shock absorption can be performed on both the handle housing 11 and the motor housing 12 at the direct contact point.

[0101] Furthermore, the elastic element 10 also serves to prevent wear. When the power tool 100 vibrates during operation, this vibration causes relative displacement between the handle housing 11 and the motor housing 12. Each vibration generates one relative displacement. Since the power tool 100 vibrates at a relatively high frequency during operation, this frequent relative displacement can cause wear at the contact points between the handle housing 11 and the motor housing. The elastic element 10 separates the two, preventing them from wearing each other due to direct contact when the power tool 100 vibrates.

[0102] The elastic element 10 can be made of an elastic material and can be integrally injection molded onto the inner front wall of the handle housing 11. When the first half-shell 11a, the second half-shell 11b, and the motor housing 12 are fastened together using the connecting assembly 8, the radially inner side of the elastic element 10 can abut against the outer wall of the motor housing 12. This arrangement allows the axially overlapping portion of the handle housing 11 and the motor housing 12 to be separated by the elastic element 10, preventing direct contact between the two when the power tool 100 vibrates during operation. Furthermore, to further improve the shock absorption and separation effect of the elastic element 10, the elastic element 10 can be injection molded onto both the front end face and the front outer wall of the handle housing 11, so that the elastic element 10 not only covers the inner front wall of the handle housing 11 but also covers the front end face and the front outer wall of the handle housing 11.

[0103] The elastic elements 10 at the front ends of the two half-shells, the first half-shell 11a and the second half-shell 11b, can form a complete closed ring structure, so that the elastic elements 10 form a complete circle and fill the gap between the handle housing 11 and the motor housing 12. This can both dampen shock and seal the gap, preventing external annular dust from entering the interior of the power tool 100 through the gap between the handle housing 11 and the motor housing 12 and damaging its internal components.

[0104] The elastic element 10 can also be attached to the front end of the handle housing 11 using a snap-fit ​​method. As a separate component (elastic sleeve), after the first half-shell 11a and the second half-shell 11b are fastened together using the connecting assembly 8 to form the handle housing 11, the elastic sleeve is snapped onto the front end of the handle housing 11, allowing it to fill the gap between the handle housing 11 and the motor housing 12. Of course, the specific implementation of the elastic element 10 is not limited to the two methods described above: integral injection molding and elastic sleeve snap-fit. Any method that can satisfy the requirements of shock absorption, wear prevention, and sealing is within the scope of protection claimed by this application.

[0105] The elastic element 10, made of elastic material, can not only separate the handle housing 11 and the motor housing 12 to prevent them from wearing out when the power tool 100 vibrates, but also play a role in shock absorption to a certain extent. Together with the shock absorber 9, it further weakens the vibration transmitted to the operator and improves the operator's operational stability and comfort.

[0106] In some embodiments, see Figure 10The elastic element 10 can also be disposed on the rear end face of the motor housing 12 and the front end face of the handle housing 11 to achieve the above-mentioned function. At this time, only the second connecting part 121 on the motor housing 12 is housed inside the handle housing 11, and the above-mentioned variable gap is formed between the rear end face of the motor housing 12 and the front end face of the handle housing 11. The elastic element 10 can also be injection molded, elastically sleeved, or in other forms to be disposed in the above-mentioned variable gap.

[0107] See Figure 3 The output housing 13 can be made of metal and is used to house the power mechanism and output shaft 2. The output housing 13 can be fastened to the front end of the motor housing 12 by bolts or other connection methods, such as... Figure 3 As shown, four bolts extend from back to front along the axial direction, enter from the front end of the motor housing 12 and pass through the output housing 13, and cooperate with nuts to fix the output housing 13 to the motor housing 12.

[0108] The power mechanism can include a transmission component 4 and an impact component 5, like an electric wrench; it can also include only the transmission component 4, like an electric drill; or it can even include neither the transmission component 4 nor the impact component 5, like some low-voltage screwdrivers. Figure 3 As shown, in the technical solution disclosed in this application, the power mechanism includes a transmission component 4 and an impact component 5 distributed axially from back to front. For ease of assembly, the output housing 13 can be divided into a front housing portion 131 and an intermediate housing portion 132 connected to the rear end of the front housing portion 131 and internally connected to it. The impact component 5 is housed in the front housing portion 131, and the transmission component 4 is housed in the intermediate housing portion 132. Considering both the compactness of the power tool 100 structure and its dimensional compatibility with the housing 1, the outer diameter D3 of the transmission component 4 is set to be less than or equal to 100 mm, and the length L3 of the transmission component 4 is set to be less than or equal to 30 mm.

[0109] Transmission component 4 can be as follows Figure 11 The compound planetary gear system shown can also be as follows: Figure 12 The second-stage planetary gear system is shown. Figure 11The transmission assembly 4 shown is similar to commonly used compound planetary gear systems, including a sun gear 41 connected to the rotor shaft of the motor 3, an internal gear ring 42 circumferentially fixed to the inner wall of the output housing 13, a compound planetary gear 43 meshing with both the sun gear 41 and the internal gear ring 42, and a planet carrier 44 for mounting the compound planetary gear 43 and drivingly connecting it to the impact assembly 5. The compound planetary gear 43 has a first tooth portion 431 and a second tooth portion 432 with different pitch circle diameters. The first tooth portion 431 meshes with the sun gear 41, and the second tooth portion 432 meshes with the internal gear ring 42. The power of the motor 3 is transmitted to the impact assembly 5 sequentially through the sun gear 41, the compound planetary gear 43, and the planet carrier 44. Figure 12 As shown, the outer diameter D4 of the internal gear ring 42 is set to be less than or equal to 100 mm, and the distance L5 from the front end face of the compound planetary gear to the rear end face of the internal gear ring is set to be less than or equal to 30 mm.

[0110] Figure 13 The transmission assembly 4 shown is similar to a commonly used two-stage planetary gear system, including a first-stage planetary gear set driven by the motor 3 and a second-stage planetary gear set connected to the impact assembly. The first-stage planetary gear set includes a first-stage sun gear 45 connected to the rotor shaft of the motor 3, a first-stage internal gear ring 46 circumferentially fixed to the inner wall of the output housing 13, a first-stage planetary gear 47 meshing with both the first-stage sun gear 45 and the first-stage internal gear ring 46, and a first-stage planetary carrier 48 for mounting the first-stage planetary gear 47. The second-stage planetary gear set includes a second-stage sun gear 49 formed at the front end of the first-stage planetary carrier 48, a second-stage internal gear ring 410 circumferentially fixed to the inner wall of the output housing 13, a second-stage planetary gear 420 meshing with both the second-stage sun gear 49 and the second-stage internal gear ring 410, and a second-stage planetary carrier 430 for mounting the second-stage planetary gear 420 and connecting it to the impact assembly 5. The power from motor 3 is transmitted sequentially to the impact assembly 5 via a first-stage sun gear 45, a first-stage planetary gear 47, a first-stage planetary carrier 48, a second-stage sun gear 49, a second-stage planetary gear 420, and a second-stage planetary carrier 430. Among these, for example... Figure 14 As shown, the outer diameter D6 of the first-stage internal gear ring and the outer diameter D7 of the second-stage internal gear ring are both set to be less than or equal to 100 mm, and the distance L6 from the front end face of the second-stage planetary gear to the rear end face of the first-stage internal gear ring is set to be less than or equal to 30 mm.

[0111] Impact component 5 can be as follows Figure 3 , Figure 4The device includes an impact block 51, a steel ball 52, a spring 53, and a spindle 54. One end of the spring 53 abuts against the impact block 51, and the other end abuts against the rear end of the spindle 54. The spindle 54 has two guide grooves, and the impact block 51 also has guide grooves. The steel ball 52 is embedded in the two guide grooves. The rear end of the output shaft 2 has a protrusion (i.e., a receiving part 22), and the front end of the impact block 51 has a corresponding protrusion. The operating principle of the impact assembly 5 of the power tool 100 is similar to that of a conventional impact wrench (such as the impact mechanism in Japanese Patent Application No. JP1982137905U). The power of the motor 3 is transmitted to the spindle 54 via the transmission assembly 4. The spindle 54 accumulates impact torque through the spring 53, and then applies periodic circumferential impact torque to the output shaft 2 through the cooperation of the protrusion at the front end of the impact block 51 and the protrusion (receiving part 22) at the rear end of the output shaft 2. For example, Figure 12 , Figure 14 As shown, the diameter D2 of the striking block 51 is less than or equal to 90mm, and its periodic impact on the output shaft 2 causes the output shaft 2 to generate a working torque of at least 1200Nm under the cumulative action over a certain period of time.

[0112] See Figure 3 The output shaft 2 is rotatably supported on the front shell portion 131 of the output housing 13. It can be structurally divided into a receiving portion 22 located at the rear end and an output portion 21 connected to the front end of the receiving portion 22. The front end of the output portion 21 protrudes beyond the front end of the front shell portion 131. The receiving portion 22 and the output portion 21 can be integrally injection molded or fixedly connected, or they can be fixed together in other ways; the connection relationship between the two is not limited to these methods. The receiving portion 22 is the protrusion formed at the rear end of the output shaft 2 as described above. It is used to receive the circumferential rotational impact of the protrusion at the front end of the striking block 51. This circumferential rotational impact is transmitted from the receiving portion 22 to the output portion 21. A chuck or sleeve can be installed at the front end of the output portion 21 for external operation.

[0113] See Figures 15-19 The power tool 100 disclosed in this application also has a partition 20, which is disposed between the output shaft 2 and the output housing 13 to protect the output housing 13 and prevent the output shaft 2 from directly contacting the output housing 13 during operation, thus avoiding wear on the output housing 13. Figure 15 As shown, the output housing 13 is divided into a cylindrical section 13a and a reduced-diameter section 13b from back to front. The diameter of the cylindrical section 13a is larger than that of the reduced-diameter section 13b, and the two are smoothly connected. For aesthetic reasons, the diameter of the cylindrical section 13a can be larger than the diameter of the motor housing 12. The output part 21 of the output shaft 2 is rotatably supported on the reduced-diameter section 13b by a bearing 40, while the receiving part 22 of the output shaft 2 is housed in the cylindrical section 13a. The bearing 40 is located in front of the partition 20.

[0114] The partition 20 can be a generally annular metal gasket with a central through hole 201 in its middle portion for the output portion 21 of the output shaft 2 to pass through. Its main body is located in front of the output portion 21, separating the output portion 21 from the front housing portion 131 and preventing the output shaft 2 from wearing the front housing portion 131 of the output housing 13 during operation. In order to maximize the anti-wear effect of the partition 20 on the output housing 11, the ratio of the outer diameter D8 of the partition 20 to the diameter D9 of the receiving portion 22 is set between 0.8 and 1.

[0115] In the axial direction, the output shaft 2 is supported by the aforementioned spindle 54, so that the gap between the front end face of the output part 21 and the front housing part 131 is adapted to the thickness of the partition 20. However, after the power tool 100 has been used for a period of time, the partition 20 is worn and its thickness decreases. Since the partition 20 is movably assembled in the output housing 13, the partition 20 will deflect after wear, that is, there is a certain angle between the central axis of the central through hole 201 of the partition 20 and the central axis of the output shaft 2. This will cause the inner peripheral wall of the central through hole 201 of the partition 20 to directly contact the outer peripheral surface of the output part 21 of the output shaft 2, thereby causing the output shaft 2 to be stuck and unable to work externally.

[0116] To avoid the aforementioned problem of the output shaft 2 being stuck, the technical solution disclosed in this application provides a first limiting part 202 on the front end face of the partition 20 and a matching second limiting part 133 on the front inner wall of the output housing 13. The two cooperate with each other to restrict the radial movement of the partition 20. Even if it is worn thin, it can only move in the axial direction. This arrangement ensures that the central axis of the central through hole 20 of the partition 20 is always parallel to the central axis of the output shaft 2, so that the output shaft 2 will not be stuck and can no longer operate externally.

[0117] like Figure 15 , Figure 16 As shown, the first limiting part 202 can be specifically implemented as an annular protrusion formed on the front end face of the partition 20. The annular protrusion can be coaxially arranged with the central through hole 20 of the partition 20, and the protrusion height of the annular protrusion is greater than the gap between the front end face of the partition 20 and the front inner wall of the output housing 13, thereby ensuring that no matter how worn the partition 20 is, the first limiting part 202 and the second limiting part 133 can play a limiting role to restrict the radial movement of the partition 20. The second limiting part 133 can be specifically implemented as a groove formed on the front inner wall of the output housing 13. In order to reduce the weight of the output housing 13, a rib 134 extending rearward along the axial direction can be provided on the front inner wall of the output housing 13. Multiple ribs 134 are circumferentially distributed on the outer periphery of the output shaft 2, and the second limiting part 133 can be formed on the rear end face of the rib 134.

[0118] The rib 134 is generally plate-shaped, extending radially from the sidewall of the reduced-diameter section 13b toward the sidewall of the cylindrical section 13b. The rib 134 can be integrally formed with the output housing 13. The second limiting portion 133 is formed on the rear end face of the rib 134, specifically forming an axially extending groove on the rear end face of the rib 134. The annular protrusion is inserted into the groove, and the two cooperate to restrict the radial movement of the partition 20. A third limiting portion 135 can also be formed on the rear end face of the rib 134. Specifically, this can be implemented as a protrusion located radially outside the partition 20 and extending rearward in the axial direction. The third limiting portion 135 is disposed adjacent to the outer sidewall of the partition 20. The third limiting portions 135 on multiple ribs 134 cooperate to confine the annular partition 20 in the middle, further restricting the radial movement of the partition 20. Additionally, the front end face of the partition 20 can simultaneously abut against the rear end face of the rib 134 and the rear end face of the reduced diameter section 13b, thereby increasing the support strength of the output housing 13 for the partition 20 and preventing the rib 134 from being damaged due to excessive force exerted by the receiving part 22 of the output shaft 2 on the partition 20. Furthermore, to further improve the support strength of the output housing 13, the radial projections of the first limiting part 202 and the second limiting part 133 can at least partially overlap with the radial projection of the reduced diameter section 13b.

[0119] In some embodiments, the shape features of the first limiting portion 202 and the second limiting portion 133 can also be interchanged, such as... Figure 18 As shown, the first limiting part 202 can be an annular groove formed on the front end face of the partition member 20, while the second limiting part 133 can be a protrusion extending in the axial direction formed on the rear end face of the aforementioned rib 134. The first limiting part 202 and the second limiting part 133, thus configured, can also serve a limiting function to restrict the radial movement of the partition member 20.

[0120] In some embodiments, the partition 20 can also be integrally formed with the output housing 13. For example... Figure 19 As shown, the front inner wall of the output housing 13 has a groove recessed along the axial direction. The partition 20 is directly die-cast into this groove, making the partition 20 and the output housing 13 an integral unit. At this time, the first limiting part 202 is the outer wall of the partition 20, and the second limiting part 133 is the aforementioned groove. With this configuration, the partition 20 will not jam the output shaft 2 even if it wears and becomes thinner.

[0121] See Figure 1 , Figure 2 , Figure 4The power tool 100 disclosed in this application also has a secondary handle 30 for assisting the operator in holding the power tool 100. It is used in conjunction with the grip portion 111 of the handle housing 11. The operator can hold the grip portion 111 with one hand and the secondary handle 30 with the other hand, which can improve the stability of the operator holding the power tool 100 and facilitate precise operation.

[0122] like Figure 4 As shown, the secondary handle 30 can be sequentially divided into a mounting portion 301, a transition portion 302, and a handle portion 303 along the radial direction. These three parts can be integrally injection molded or connected as a single unit using other methods. The mounting portion 301 is used for fixed connection with the housing 1. It can be fastened to the output housing 13 with screws, or to the motor housing 12 and the handle housing 11. In this application, the mounting portion 301 can be disposed on the side wall of the intermediate housing portion 132. A generally square mounting protrusion 132a can protrude from the outer wall of the intermediate housing portion 132, and the mounting portion 301 is fastened to this mounting protrusion 132a with screws.

[0123] The handle 303 is located radially outside the mounting part 301, and its length extension direction is roughly parallel to the length extension direction of the grip part 111. This is more ergonomic for the operator to hold the power tool 100 with both hands, and improves the operator's experience of holding the power tool 100 during operation.

[0124] Taking into account factors such as ease of use, aesthetics, user experience, and economical production costs, the power tool disclosed in this application has an excessively long handle housing 11 and motor housing 12. Therefore, when designing the outline of the auxiliary handle 30, one end serving as the mounting part 301 is connected to the output housing 13, which has greater structural strength, while the other end serving as the handle part 303 needs to extend radially outward towards the front or rear end, thus forming a transition part 302 and a handle 303. This arrangement ensures that the mounting part 301 at least partially overlaps with the axial projection of the transmission assembly 4, and the handle 303 at least partially overlaps with the axial projection of the motor 3. This makes it easier for the operator to hold the power tool 100 more stably and prevents it from slipping out of their hand. For example, Figure 2 As shown, the axial distance L9 between the handle portion 303 and the grip portion 111 of the handle housing 11 is set to be greater than or equal to 350 mm and less than or equal to 400 mm, and the radial distance L10 between the handle portion 303 and the grip portion 111 of the handle housing 11 is greater than or equal to 100 mm and less than or equal to 150 mm. This setting can better accommodate the span of most operators' open hands, making it more comfortable for operators to hold the power tool 100 with both hands, resulting in a better user experience.

[0125] In another specific embodiment, the power tool includes:

[0126] The housing includes a motor housing, an output housing located at the front end of the motor housing, and a handle housing extending from the rear end of the motor housing in a direction opposite to that of the output housing;

[0127] An electric motor, which is housed in the motor housing;

[0128] A battery pack, attached to the housing, is used to provide power to the motor;

[0129] An output shaft, which is rotatably supported by the output housing and protrudes from the front end of the output housing;

[0130] An impact assembly, which is housed in the output housing;

[0131] A transmission assembly, housed in the output housing, is connected to the motor and the impact assembly respectively to transmit power from the motor to the impact assembly. It should be noted that the battery pack 50 therein... Figure 22 As shown, the battery pack 50, located at the rear end of the handle housing 11, can provide electrical power to the motor so that it can drive the output shaft to output torque.

[0132] Combination Figure 3 and Figure 4 In some embodiments, the power tool of this application includes a motor housing 12, a motor 3, an output shaft 2, an impact assembly 5, and a transmission assembly 4. The motor 3 is disposed within the motor housing 12; the output shaft 2 is rotatably supported on the motor housing 12; the impact assembly 5 is housed in the motor housing 12 and is capable of applying a circumferential rotational impact force to the output shaft 2; the transmission assembly 4 is housed in the motor housing 12 and is drively connected to the motor 3 and the impact assembly 5 respectively, and the transmission assembly 4 is capable of receiving the driving force of the motor 3 and transmitting it to the impact assembly 5 to enable the output shaft 2 to perform external operations.

[0133] Combination Figures 23-25 The motor 3 includes a stator 31 and a rotor. The stator 31 includes a stator core 313, and an electrical insulation component 318 is provided inside the stator core 313. A coil is wound on the stator core 313 through the electrical insulation component 318. The rotor includes a rotor core 322 that is rotatable relative to the stator core 313 about an axis 320. The rotor core 322 is disposed within the inner ring of the stator core 313 and is fixedly connected to a motor shaft 323. The motor shaft 323 rotates with the rotor core 322.

[0134] Combination Figures 23-26As shown, the stator core 313 has a radially protruding anti-rotation portion 314, and the motor housing 12 has an anti-rotation groove 124 that abuts against the anti-rotation portion 314. The anti-rotation portion 314 includes at least a curved surface portion 3142 with a curvature and a flat surface portion 3143 extending along a plane. At least one of the curved surface portion 3142 and the flat surface portion 3143 can abut against the anti-rotation groove 124. By providing the anti-rotation portion 314 for connection with the motor housing 12 with at least a curved surface portion 3142 with a curvature and a flat surface portion 3143 extending along a plane, the relative contact area between the outer surface of the anti-rotation portion 314 and the inner surface of the anti-rotation groove 124 is increased, and the pressure borne per unit contact area between the anti-rotation portion 314 and the anti-rotation groove 124 is relatively reduced. In this way, the connection between the motor housing 12 and the anti-rotation portion 314 is less prone to deformation or damage, thereby ensuring the service life of the entire machine.

[0135] Of course, if the pressure per unit contact area between the anti-rotation part 314 and the anti-rotation groove 124 remains constant, the larger the contact area, the greater the support force that the motor housing 12 can provide to the stator core 313, and the more suitable it is for the installation and use of high-torque power tools.

[0136] In some embodiments, the stator core 313 has a circular cross-section, and the anti-rotation portion 314 protrudes radially from the surface of the stator core 313.

[0137] In some embodiments, the transmission assembly 4 can receive the driving force of the motor 3 and transmit it to the impact assembly 5 to enable the output shaft 2 to operate externally, and the maximum torque output by the output shaft 2 is not less than 1200 N·m. In some embodiments, the output torque of the output shaft 2 can be 1800 N·m, 2300 N·m, or 3200 N·m.

[0138] like Figure 25 and Figure 26 In some embodiments, the anti-rotation groove 124 includes a curved inner wall 1241 and / or a flat inner wall 1242. The curved inner wall 1241 can correspond to and cooperate with the curved part 3142, and the flat inner wall 1242 can correspond to and cooperate with the flat part 3143. By providing a curved inner wall 1241 on the inner wall of the anti-rotation groove 124 for corresponding cooperation with the curved part 3142 of the anti-rotation part 314, and providing a flat inner wall 1242 on the inner wall of the anti-rotation groove 124 for corresponding cooperation with the flat part 3143 of the anti-rotation part 314, the contact area between the anti-rotation part 314 and the anti-rotation groove 124 can be increased, and the motor housing 12 can provide greater support for the stator core 313.

[0139] In some embodiments, the anti-rotation groove 124 may include only the curved inner wall 1241, only the planar inner wall 1242, or be composed of the curved inner wall 1241 and the planar inner wall 1242.

[0140] like Figures 24-26 In some embodiments, at least one anti-rotation portion 314 includes a curved portion 3142 and flat portions 3143 located on both sides of the curved portion 3142. The anti-rotation portion 314 is arranged radially along the stator core 313. The curved portion 3142 is located at the front end of the anti-rotation portion 314 in the radial direction, and the flat portions 3143 are located on both sides of the anti-rotation portion 314. By setting the front end as a curved surface and the sides as flat surfaces, compared with the design of the anti-rotation portion 314 with a flat front end and flat sides, adjusting the flat structure of the front end to a curved surface structure can increase the contact area between the anti-rotation portion 314 and the inner wall of the anti-rotation groove 124 in the circumferential direction. This provides greater support force to the stator core 313 through the motor housing 12, ensuring the service life of the high-torque power tool.

[0141] Furthermore, in the existing technology, the front end of the anti-rotation part is designed as a flat structure. This means that when the stator core 313 needs to provide circumferential support, the flat surface of the front end cannot contact the inner wall of the anti-rotation groove 124, thus failing to provide circumferential support and resulting in a waste of resources in this part of the structure. In this embodiment, by designing the radially extending front end of the anti-rotation part as a curved structure, this curved structure can contact the side wall of the anti-rotation groove and provide circumferential support to the anti-rotation part, thereby improving the stability of the stator core 313 and the motor housing 12 during installation.

[0142] In some specific embodiments, the surface area of ​​the single-sided planar portion 3143 is greater than or equal to 180 mm². 2 And less than or equal to 300mm 2 In some embodiments, the surface area of ​​the single-sided planar portion 3143 is 180 mm. 2 260mm 2 Or 300mm 2 .

[0143] like Figure 24 As shown, in some embodiments, the anti-rotation portion 314 includes a first connecting hole 3141 for connection with the motor housing 12. The outer contour of the curved surface portion 3142 is formed by rotating the endpoint of a straight line segment around a fixed point. The fixed point roughly coincides with the center line 319 of the first connecting hole 3141. In this way, the curved surface portion 3142 is a whole curved surface structure on the anti-rotation portion 314, and the curvature between each local curved surface is the same. Since the anti-rotation portion 314 is part of the stator core 313 in the stator 31, and the stator core 313 is formed by stacking multiple stator laminations, to achieve the above-mentioned curved surface structure with the same curvature in each local area, it is only necessary to stack multiple identical stator laminations to form a curved surface structure with the same curvature. Of course, stator laminations with arc-shaped front ends along the radial direction of the anti-rotation portion 314 should be used. During stacking and installation, the arc-shaped edges of each stator lamination with arc-shaped front ends should be aligned.

[0144] In some embodiments, the curved surface 3142 can be configured as a surface with multiple curvatures. Similarly, the flat surface 3143 can also be configured as a plane with different heights. Of course, the curved surface 3142 can also be adjusted to a structure combining a curved surface and a flat surface, and the flat surface 3143 can also be adjusted to a structure combining a curved surface and a flat surface.

[0145] In some embodiments, the motor housing 12 is provided with a second connection hole, and the first connection hole 3141 can be connected to the second connection hole through a connector 315 to fix the stator core 313 to the motor housing 12, so as to realize the fixation of the stator core 313 on the motor housing 12 through the connection between the first connection hole 3141 and the second connection hole.

[0146] like Figure 23 As shown, in some embodiments, the anti-rotation part 314 has an insulating layer, and a serrated washer 316 is provided at the mating point between the anti-rotation part 314 and the connector 315. When the serrated washer 316 pierces the insulating layer of the anti-rotation part 314, the serrated washer 316 can be electrically connected to the anti-rotation part 314. The serrated washer 316 is connected to a wire 3161. The wire 3161 connects the stator core 313 and the control board inside the power tool. The connector 315 can be a bolt structure such as a hexagonal bolt or an internal hexagonal nut. In this embodiment, the main focus is on piercing the insulating layer of the end face 317 of the anti-rotation part 314 to enable electrical conduction between the anti-rotation part 314 and the serrated washer 316 when current is present. In some embodiments, the serrated washer 316 is a hollow annular structure and is sleeved on the connector 315. The serrated washer 316 is a conductor.

[0147] In some embodiments, a conductive ring is also fitted onto the connector 315. The conductive ring abuts against and is electrically connected to the serrated pad 316. The conductive ring is directly electrically connected to the wire 3161, and static electricity generated by the stator core 313 can be discharged through the serrated pad 316, the conductive ring, and the wire 3161. In some embodiments, the conductive ring is located on the side of the serrated pad 316 away from the end face 317. This arrangement is to prevent the wire from rotating with the serrated pad 316 when it is driven to rotate, thus reducing the possibility of the wire 3161 winding. In some embodiments, the conductive ring is made of copper.

[0148] It should be noted that in AC brushless manual power tools, the ground wire (wire 3161 mentioned above) connecting the motor stator (stator core 313) to the control board is usually used as the circuit's reference zero potential point, also known as the power ground (PGND). Its specific function is as follows:

[0149] Forming a current loop: In the circuit of a power tool, current flows from the power source, passes through the motor stator (stator core 313) and other loads, and needs to return to the power source to form a loop. This ground wire provides a return path for the current, enabling the circuit to function properly.

[0150] Stabilizing circuit potential: Serving as the 0V reference point for the entire circuit, ensuring that the potential at each point in the circuit is relatively stable, which helps electronic components to work normally and avoids performance abnormalities caused by potential fluctuations.

[0151] Reduce electromagnetic interference: When the motor 3 is running, it will generate electromagnetic interference. Connecting the stator (stator core 313) to the ground wire of the control board can suppress and attenuate the electromagnetic signals generated by the stator 31 through the ground wire loop, reduce interference to other circuits on the control board, and improve the overall electromagnetic compatibility of the tool.

[0152] This type of ground wire differs from the protective ground wire connected to the earth. It does not carry leakage current to the earth. Its main purpose is to meet the electrical performance requirements of the circuit and ensure the normal operation and stability of the power tool.

[0153] Combination Figure 24 and Figure 25 In some embodiments, the rotor core 322 is rotatable within and relative to the stator core 313 about an axis 320. The stator core 313 includes a stator core body, and an anti-rotation portion 314 is disposed on the outer wall of the stator core body. The maximum distance between the anti-rotation portion 314 and the axis 320 is defined as A, and the maximum distance between the stator core body and the axis 320 is defined as B. The ratio of A to B is greater than or equal to 1.1 and less than or equal to 1.4. Along the radial direction of the stator core 313, the length of the anti-rotation portion 314 is limited to ensure the contact area between the anti-rotation portion 314 and the motor housing 12 in the circumferential direction, so that the motor housing 12 provides sufficient circumferential support force for the stator core 313, ensuring the connection stability between the stator core 313 and the motor housing 12. In some embodiments, the ratio of A to B is 1.1, 1.2, 1.3, or 1.4.

[0154] like Figure 23 and Figure 24 In some embodiments, the stator core 313 is formed by stacking multiple stator laminations, and the stator core 313 includes a conductive structure 321 that connects the various stator laminations to form an equipotential body. In some embodiments, the conductive structure 321 is electrically connected to the various stator laminations by welding.

[0155] Combination Figure 24 and Figure 25In some embodiments, three anti-rotation portions 314 are provided, and the three anti-rotation portions 314 can be symmetrically arranged about the axis 320. In some embodiments, the line connecting the center lines 319 of the three anti-rotation portions 314 can form an equilateral triangle structure, which has extremely high geometric invariance. When subjected to horizontal or torsional forces, the equilateral triangle support can effectively distribute the force throughout the entire structure, rather than concentrating it at a single connection point, thereby resisting deformation.

[0156] Furthermore, the three-point support enhances the stability of the connection between the stator core 313 and the motor housing 12. The three anti-rotation parts 314 are symmetrical about the axis 320, ensuring that each support point (the connection between the anti-rotation part 314 and the motor housing 12) bears approximately equal forces. This simplifies the structural stress analysis, avoids excessive local stress, and improves the overall rigidity and reliability of the structure.

[0157] like Figures 23-26 As shown, this application also provides a power tool, including a motor housing 12, a motor 3, an output shaft 2, an impact assembly 5, and a transmission assembly 4. The motor housing 12 has a first connecting limiting portion; the motor 3 is disposed within the motor housing 12; the output shaft 2 is rotatably supported on the motor housing 12; the impact assembly 5 is housed in the motor housing 12 and is capable of applying a circumferential rotational impact force to the output shaft 2; the transmission assembly 4 is housed in the motor housing 12 and is transmissionally connected to the motor 3 and the impact assembly 5 respectively, and the transmission assembly 4 transmits power from the motor 3 to the impact assembly 5 to enable the output shaft 2 to operate externally. The motor 3 includes a stator core 313 and a rotor core 322. The stator core 313 includes a second connecting limiting portion. The first connecting limiting portion can restrict the movement of the second connecting limiting portion, thereby limiting the rotation of the stator core 313 relative to the motor housing 12; the second connecting limiting portion includes a curved surface 3142 and a flat surface 3143 located on its outer surface, at least one of the curved surface 3142 and the flat surface 3143 being capable of abutting against the first connecting limiting portion.

[0158] By providing a curved surface 3142 and a flat surface 3143 on the outer surface of the second connecting part (anti-rotation part 314) used to connect with the motor housing 12, the relative contact area between the first limiting part and the second limiting part is increased, and the pressure per unit contact area between the first limiting part and the second limiting part is relatively reduced. In this way, the connection between the motor housing 12 and the second connecting part is less prone to deformation or damage, thereby ensuring the service life of the whole machine.

[0159] While ensuring contact, between a plane and a curved surface with the same projected area, the curved surface has a larger contact area. Moreover, when force is applied to the curved surface, the force will be dispersed along the tangent direction of the curved surface, reducing local pressure. Therefore, under the same pressure per unit area, the curved surface can provide greater support force, which in turn provides greater support force to the stator core 313 through the motor housing 12, ensuring the service life of high-torque power tools.

[0160] In some embodiments, the first connecting portion may be a protruding structure (anti-rotation portion 314) extending radially outward along the surface of the stator core 313, and correspondingly, the second connecting portion is a recessed structure (anti-rotation groove 214). In some embodiments, the first connecting portion may also be a structure that is radially recessed inward along the surface of the stator core 313, and correspondingly, the second connecting portion is a protruding structure.

[0161] In some embodiments, the curvature of any two local surfaces in the curved surface 3142 is the same. Since the second connecting part is a part of the stator core 313, and the stator core 313 is formed by stacking multiple stator laminations, to achieve the above-mentioned curved surface structure with the same local curvature, it is only necessary to stack multiple identical stator laminations to form a curved surface structure with the same curvature. Of course, stator laminations with arc-shaped front ends along the radial direction of the second connecting part should be used, and the arc-shaped edges of each stator lamination with arc-shaped front ends should be aligned during stacking.

[0162] In some embodiments, the curvature of any two local surfaces in the curved surface 3142 is different. The curved surface 3142 can be configured as a surface with multiple curvatures.

[0163] Similarly, the planar portion 3143 can also be configured as a plane of different heights. Of course, the curved portion 3142 can also be adjusted to a structure combining curved and planar surfaces, and the planar portion 3143 can also be adjusted to a structure combining curved and planar surfaces.

[0164] This application also provides an electric tool, including a motor housing 12, a motor 3, and an output shaft 2. The motor housing 12 has a first connecting limiting portion; the motor 3 is disposed inside the motor housing 12, and the motor 3 includes a stator core 313 and a rotor core 322 that can rotate relative to the stator core 313. The stator core 313 includes a second connecting limiting portion. When the first connecting limiting portion is connected to a second connecting fiber cloth, it can restrict the movement of the second connecting limiting portion, thereby limiting the rotation of the stator core 313 relative to the motor housing 12. The second connecting limiting portion includes a curved surface 3142 and a flat surface 3143 located on its outer surface. At least one of the curved surface 3142 and the flat surface 3143 can form an abutment with the first connecting limiting portion. The output shaft 2 is rotatably supported on the motor housing 12, and the output shaft 2 can receive the driving force of the motor 3 and output power externally.

[0165] 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, include: Motor housing; The motor is housed within the motor housing; The output shaft is rotatably supported on the motor housing; An impact assembly, housed in the motor housing, is capable of applying a circumferential rotational impact force to the output shaft; a transmission assembly, housed in the motor housing and connected to both the motor and the impact assembly, is capable of receiving the driving force from the motor and transmitting it to the impact assembly to enable the output shaft to operate externally. The motor includes a stator core and a rotor core that can rotate relative to the stator core about an axis. The stator core has a radially protruding anti-rotation portion. The motor housing has an anti-rotation groove that abuts against the anti-rotation portion. The anti-rotation portion includes at least a curved surface portion with a curvature and a flat surface portion extending along a plane. At least one of the curved surface portion and the flat surface portion can abut against the anti-rotation groove.

2. The power tool according to claim 1, characterized in that: The anti-rotation groove includes a curved inner wall and / or a flat inner wall. The curved inner wall can correspond to and cooperate with the curved part, and the flat inner wall can correspond to and cooperate with the flat part.

3. The power tool according to claim 1, characterized in that: At least one of the anti-rotation portions includes a curved surface portion and flat surfaces located on both sides of the curved surface portion.

4. The power tool according to claim 3, characterized in that: The surface area of ​​the planar portion on one side is greater than or equal to 180 mm. 2 And less than or equal to 300mm 2 .

5. The power tool according to claim 1, characterized in that: The anti-rotation part includes a first connection hole for connecting with the motor housing. The outer contour of the curved part is formed by rotating the endpoint of a straight line segment around a fixed point, and the fixed point roughly coincides with the center line of the first connection hole.

6. The power tool according to claim 5, characterized in that: The motor housing is provided with a second connection hole, and the first connection hole can be connected to the second connection hole through a connector to fix the stator core to the motor housing.

7. The power tool according to claim 6, characterized in that: The anti-rotation part has an insulating layer, and a serrated pad is provided at the mating point between the anti-rotation part and the connector. When the serrated pad is driven to pierce the insulating layer of the anti-rotation part, the serrated pad can be electrically connected to the anti-rotation part, and the serrated pad is connected to a wire.

8. The power tool according to claim 1, characterized in that: The stator core includes a stator core body, and the anti-rotation part is disposed on the outer wall of the stator core body. The maximum distance between the anti-rotation part and the axis is defined as A, and the maximum distance between the stator core body and the axis is defined as B. The ratio of A to B is: A / B is greater than or equal to 1.1 and less than or equal to 1.

4.

9. The power tool according to claim 1, characterized in that: The stator core is formed by stacking multiple stator laminations, and the stator core includes a conductive structure that connects the stator laminations to form an equipotential body.

10. The power tool according to claim 1, characterized in that: The maximum torque output by the output shaft is not less than 1200 N·m.

11. The power tool according to claim 1, characterized in that: The anti-rotation part is provided in three parts, and the three anti-rotation parts can be arranged symmetrically about the axis.

12. A power tool, characterized in that, include: The motor housing has a first connecting and limiting part; The motor is housed within the motor housing; The output shaft is rotatably supported on the motor housing; An impact assembly, housed in the motor housing, is capable of applying a circumferential rotational impact force to the output shaft; a transmission assembly, housed in the motor housing and connected to both the motor and the impact assembly, transmits power from the motor to the impact assembly to enable the output shaft to operate externally. The motor includes a stator core and a rotor core. The stator core includes a second connecting limiting part. The first connecting limiting part can restrict the movement of the second connecting limiting part, thereby limiting the rotation of the stator core relative to the motor housing. The second connecting limiting portion includes a curved surface and a flat surface on its outer surface, at least one of which can abut against the first connecting limiting portion.

13. The power tool according to claim 12, characterized in that: The curvature of any two local surfaces in the curved surface is the same.

14. The power tool according to claim 12, characterized in that: The curvature of any two local surfaces in the curved surface is different.

15. A power tool, characterized in that, include: The motor housing has a first connecting and limiting part; An electric motor is disposed within the motor housing. The motor includes a stator core and a rotor core that can rotate relative to the stator core. The stator core includes a second connecting limiting part. When the first connecting limiting part is connected to the second connecting fiber cloth, it can restrict the movement of the second connecting limiting part, thereby limiting the rotation of the stator core relative to the motor housing. The second connecting limiting portion includes a curved surface and a flat surface on its outer surface, at least one of which can abut against the first connecting limiting portion; The output shaft is rotatably supported on the motor housing. The output shaft can receive the driving force of the motor and output power to the outside.

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