Electric tool

Abstract

The utility model provides an electric tool which comprises a machine shell, a motor assembly, a transmission assembly, an end assembly and a shaft lock mechanism, and a through hole is formed in the machine shell. The motor assembly is arranged in the machine shell. At least part of the transmission assembly is located in the machine shell and is in dynamic coupling connection with the motor assembly. The shaft lock mechanism comprises a lock pin and a limiting piece, the lock pin can be movably arranged at the through hole, and the limiting piece is arranged at the end, located in the machine shell, of the lock pin. When the transmission assembly is in the locking state, the lock pin is located at the locking position, and the end, located in the machine shell, of the lock pin is in limiting fit with the transmission assembly so as to limit rotation of the transmission assembly. The electric tool is provided with the pressing type shaft lock mechanism, one-key shaft locking is achieved, therefore, a shaft lock structure does not need to be arranged at the end, used for installing working accessories, of the transmission assembly, configuration of an accessory wrench is omitted, the structure of the shaft lock mechanism is simple, and assembling and material cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] In existing power tools such as straight grinders, one end of the output shaft is connected to the motor shaft via a coupling, while the other end is fitted with a working attachment. The end of the output shaft used for attachment mounting typically has a flat handle and an additional attachment wrench. This allows the output shaft to be locked in place by the engagement between the flat handle and the attachment wrench when removing or replacing the attachment. However, this shaft locking method for power tools has several drawbacks. For example, it requires an extra attachment wrench, and losing the wrench makes it difficult to remove the attachment; the shaft locking structure at the attachment mounting end of the output shaft also increases the frequency of attachment replacement. Utility Model Content

[0003] The purpose of this utility model is to provide a power tool that addresses the numerous drawbacks of existing shaft locking methods in power tools.

[0004] To solve the above-mentioned technical problems, the present invention provides an electric tool, comprising:

[0005] The housing has through holes;

[0006] A motor assembly, wherein the motor assembly is disposed within the housing;

[0007] A transmission assembly, at least a portion of which is located within the housing and is dynamically coupled to the motor assembly, the motor assembly driving the transmission assembly to rotate;

[0008] An end assembly, the end assembly being connected to the transmission assembly;

[0009] A shaft locking mechanism includes a locking pin and a limiting member. The locking pin is movably disposed at the through hole. One end of the locking pin extends into the housing from the through hole. A pressing part is provided at the end of the locking pin away from the transmission component. The limiting member is disposed at the end of the locking pin located inside the housing.

[0010] When the transmission assembly is in the locked state, the locking pin is in the locked position, with one end of the locking pin located inside the housing and forming a limiting engagement with the transmission assembly to restrict the rotation of the transmission assembly; when the transmission assembly is in the released state, the locking pin is in the released position, the locking pin is separated from the transmission assembly, and the limiting member abuts against the inner side of the housing to prevent the locking pin from popping out of the housing.

[0011] Preferably, a button is provided at the end of the locking pin away from the transmission assembly, and the pressing part is provided on the part of the button located outside the housing;

[0012] An elastic element is provided at the end of the locking pin away from the transmission component. The two ends of the elastic element abut against the button and the housing, respectively, so as to drive the locking pin to move back to the release position through the elastic element.

[0013] Preferably, the housing comprises:

[0014] A first housing, wherein the transmission assembly is disposed within the first housing at one end near the motor assembly, and the through hole is provided on the first housing;

[0015] The outer casing is fitted over the first housing, and the outer casing has a clearance hole that communicates with the through hole;

[0016] The end of the button closer to the transmission component is located inside the clearance hole, and the end of the button farther from the transmission component is located outside the clearance hole, thus forming the pressing part.

[0017] Preferably, the end of the elastic element near the transmission assembly passes through the clearance hole and abuts against the first housing.

[0018] Preferably, the pressing part is provided with a pressing inclined surface facing away from the motor assembly, and the pressing inclined surface is inclined in a direction away from the motor assembly in the direction close to the transmission assembly.

[0019] Preferably, the shape of the portion of the button located within the clearance hole is adapted to the shape of the clearance hole.

[0020] Preferably, a locking pin sleeve is provided inside the through hole, and the locking pin sleeve is sleeved outside the locking pin.

[0021] Preferably, the locking pin is a nut.

[0022] Preferably, a threaded connection structure is provided between the outer surface of the locking pin sleeve and the inner surface of the through hole.

[0023] Preferably, the inner surface of the through hole is provided with a first stepped surface facing the transmission assembly, and the outer surface of the locking pin sleeve is provided with a second stepped surface facing away from the transmission assembly, the second stepped surface abutting against the side of the first stepped surface near the transmission assembly.

[0024] Preferably, when the locking pin is in the released position, the limiting member abuts against the locking pin sleeve.

[0025] Preferably, the limiting member is an open retaining ring, and the locking pin has an annular mounting groove at one end inside the housing, with the open retaining ring positioned at the annular mounting groove.

[0026] Preferably, the transmission assembly has a locking hole; when the transmission assembly is in the locked state, the end of the locking pin located inside the housing extends into the locking hole.

[0027] Preferably, the transmission assembly includes:

[0028] An output shaft, one end of which is located within the housing near the motor assembly;

[0029] A drive shaft sleeve is located between the motor shaft and the output shaft of the motor assembly. The two ends of the drive shaft sleeve are respectively sleeved on the outside of the motor shaft and the output shaft so as to drive the output shaft to rotate through the drive shaft sleeve when the motor shaft rotates.

[0030] When the transmission assembly is in the locked state, the end of the locking pin located inside the housing forms a limiting engagement with the output shaft to restrict the rotation of the transmission assembly.

[0031] Preferably, a bearing is provided between the transmission shaft sleeve and the housing, and an elastic ring is provided between the bearing and the housing.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The power tool of this utility model is equipped with a press-type shaft locking mechanism. The shaft locking mechanism is directly installed at the through hole of the machine housing. By pressing the pressing part of the shaft locking mechanism, the locking pin moves to the locking position and forms a limiting engagement with the transmission component, thereby locking the transmission component and realizing one-click shaft locking. In this way, it is not necessary to set a shaft locking structure at the end of the transmission component used to install working accessories, eliminating the configuration of the accessory wrench and avoiding the trouble of difficult disassembly of working accessories due to the loss of the accessory wrench. In addition, the structure of the shaft locking mechanism is relatively simple, which can reduce assembly and material costs. Attached Figure Description

[0034] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0035] Figure 1 This is a schematic diagram of the structure of the power tool in the embodiment of this utility model;

[0036] Figure 2 for Figure 1A cross-sectional view of a power tool;

[0037] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0038] Figure 4 for Figure 2 Exploded view of the central transmission assembly.

[0039] Explanation of reference numerals in the accompanying drawings of this utility model:

[0040] Power tool 1000, housing 100, first housing 110, through hole 111, locking pin sleeve 112, second housing 120, outer sleeve 130, clearance hole 131, motor assembly 200, motor shaft 210, transmission assembly 300, output shaft 310, locking hole 311, transmission shaft sleeve 320, bearing 330, elastic ring 340, end assembly 350, shaft locking mechanism 400, locking pin 410, annular mounting groove 411, limiting member 420, button 430, pressing part 431, pressing slope 432, elastic member 440.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] This utility model provides an electric tool, which can be a direct grinder, etc. The following description will use an electric direct grinder as an example. Figures 1 to 4 A preferred embodiment of the power tool provided by this utility model is shown.

[0046] Please see Figures 1 to 4 In this embodiment, the power tool 1000 includes a housing 100, a motor assembly 200, a transmission assembly 300, and a shaft locking mechanism 400. The housing 100 has a through hole 111. The motor assembly 200 is disposed within the housing 100. One end of the transmission assembly 300 is located within the housing 100 and is power-coupled to the motor assembly 200, thereby driving the transmission assembly 300 to rotate. The shaft locking mechanism 400 includes a locking pin 410 and a limiting member 420. The locking pin 410 is movably disposed at the through hole 111, and one end of the locking pin 410 extends into the housing 100 from the through hole 111. A pressing part 431 is provided at the end of the locking pin 410 away from the transmission component 300, and a limiting member 420 is provided at the end of the locking pin 410 located inside the housing 100. When the transmission component 300 is in the locked state, the locking pin 410 is in the locked position, and the end of the locking pin 410 located inside the housing 100 forms a limiting engagement with the transmission component 300 to restrict the rotation of the transmission component 300. When the transmission component 300 is in the released state, the locking pin 410 is in the released position, the locking pin 410 is separated from the transmission component 300, and the limiting member 420 abuts against the inner side of the housing 100 to prevent the locking pin 410 from popping out of the housing 100.

[0047] Specifically, the motor assembly 200 and the transmission assembly 300 are typically coaxially arranged. The transmission assembly 300 is rotatably mounted on the housing 100 along its axial direction. One end of the transmission assembly 300 is located inside the housing 100 and is power-coupled to the motor assembly 200. The other end of the transmission assembly 300 is located outside the housing 100 and is detachably mounted with an end assembly 350. The end assembly 350 includes a rotating chuck and a working attachment. By tightening and loosening the rotating chuck, the working attachment can be installed and removed. Furthermore, when the motor assembly 200 is operating, it drives the transmission assembly 300 to rotate, thereby causing the working attachment mounted on the transmission assembly 300 to rotate along with it. The axial direction of the transmission assembly 300 is defined as the front-rear direction. The end of the transmission assembly 300 closer to the motor assembly 200 is the rear end of the transmission assembly 300, and the end of the transmission assembly 300 furthest from the motor assembly 200 is the front end of the transmission assembly 300.

[0048] A through hole 111 is provided on the housing 100, and a press-type shaft locking mechanism 400 is provided at the through hole 111 of the housing 100. The shaft locking mechanism 400 is located on one side of the transmission assembly 300 in the radial direction. The locking pin 410 of the shaft locking mechanism 400 is movably disposed at the through hole 111 of the housing 100 along the extension direction of the locking pin 410, so that the locking pin 410 can approach and move away from the transmission assembly 300. The direction of movement of the locking pin 410 can be radial to the transmission assembly 300; the direction of movement of the locking pin 410 can also be tilted forward or backward relative to the radial direction of the transmission assembly 300. The following description will take the direction of movement of the locking pin 410 as radial to the transmission assembly 300 as an example, and define the direction of movement of the locking pin 410 as up and down, with the end of the locking pin 410 closer to the transmission assembly 300 as the lower end of the locking pin 410, and the end of the locking pin 410 away from the transmission assembly 300 as the upper end of the locking pin 410.

[0049] The upper end of the locking pin 410 is provided with a pressing part 431, so that the operator can press the pressing part 431 to drive the locking pin 410, which is in the release position, downward to the locking position. The lower end of the locking pin 410 extends into the housing 100 through the through hole 111. When the locking pin 410 is in the locked position, the lower end of the locking pin 410 forms a limiting engagement with the transmission component 300, thereby restricting the rotation of the transmission component 300. At this time, the transmission component 300 is locked and is in a locked state. When the locking pin 410 is in the release position, the lower end of the locking pin 410 separates from the transmission component 300, so that the limiting engagement between the lower end of the locking pin 410 and the transmission component 300 is released. At this time, the transmission component 300 is unlocked and is in a released state, and the motor assembly 200 can normally drive the transmission component 300 to rotate.

[0050] The limiting member 420 of the shaft locking mechanism 400 is located inside the housing 100, and the limiting member 420 is detachably disposed at the lower end of the locking pin 410, so that the limiting member 420 can move up and down together with the locking pin 410. When the locking pin 410 is in the released position, the limiting member 420 abuts against the inner surface of the housing 100 to prevent the locking pin 410 from popping upward out of the housing 100.

[0051] The locking pin 410 is directly assembled with the through hole 111 of the housing 100. The locking pin 410 can be installed from the outside of the housing 100 into the through hole 111. After the lower end of the locking pin 410 passes through the through hole 111 into the housing 100, the limiting member 420 is installed from the inside of the housing 100 onto the lower end of the locking pin 410 to prevent the locking pin 410 from popping out of the housing 100. This simplifies the shaft lock structure of the power tool 1000, reducing assembly and material costs.

[0052] The power tool 1000 of this utility model is provided with a press-type shaft locking mechanism 400. The shaft locking mechanism 400 is directly installed at the through hole 111 of the housing 100. By pressing the pressing part 431 of the shaft locking mechanism 400, the locking pin 410 is moved to the locking position and forms a limiting engagement with the transmission component 300, thereby locking the transmission component 300 and realizing one-click shaft locking. In this way, it is not necessary to set a shaft locking structure at the end of the transmission component 300 used for installing working accessories, eliminating the configuration of the accessory wrench and avoiding the trouble of difficult disassembly of working accessories due to the loss of the accessory wrench. In addition, the structure of the shaft locking mechanism 400 is relatively simple, which can reduce assembly and material costs.

[0053] The upper end of the locking pin 410 is provided with a pressing part 431. The specific arrangement of the pressing part 431 can be set according to the actual situation. For example, the upper end of the locking pin 410 can be directly used as the pressing part 431; alternatively, a separate component can be provided as the pressing part 431 at the upper end of the locking pin 410. Optionally, please refer to Figures 1 to 4 In this embodiment, a button 430 is provided at the end of the locking pin 410 away from the transmission component 300, and a pressing part 431 is provided at the part of the button 430 outside the housing 100; an elastic element 440 is provided at the end of the locking pin 410 away from the transmission component 300, and the two ends of the elastic element 440 abut against the button 430 and the housing 100 respectively, so that the locking pin 410 can be moved and reset to the release position through the elastic element 440.

[0054] Specifically, a button 430 is provided at the upper end of the locking pin 410. When the locking pin 410 is in the released position, at least a portion of the button 430 is located outside the housing 100, and the portion of the button 430 located outside the housing 100 forms a pressing part 431 for the operator to press. The button 430 can be integrally formed with the locking pin 410; the button 430 can also be fixedly installed on the upper end of the locking pin 410 by means of snap-fit ​​connection, threaded connection, or other methods.

[0055] A spring or other elastic element 440 is fitted onto the upper end of the locking pin 410, and the elastic element 440 is located below the button 430. The upper and lower ends of the elastic element 440 abut against the button 430 and the housing 100, respectively. When the operator presses down on the button 430, the button 430 can move the locking pin 410, which is in the release position, downward to the locked position, at which time the elastic element 440 is compressed. When the operator releases the button 430, the rebound of the elastic element 440 can automatically move the locking pin 410, which is in the locked position, upward to return to the release position. In this way, by pressing the button 430 and the rebound of the elastic element 440, the locking and unlocking of the transmission component 300 can be achieved. The following description will use the example of the locking pin 410 having a button 430 and an elastic element 440 at its upper end.

[0056] A through hole 111 is provided on the housing 100, and the specific location of the through hole 111 on the housing 100 can be set according to the actual situation. Optionally, please refer to Figures 1 to 4 In this embodiment, the housing 100 includes a first housing 110 and an outer housing 130. The end of the transmission assembly 300 near the motor assembly 200 is disposed inside the first housing 110, and the first housing 110 has a through hole 111. The outer housing 130 is sleeved on the outside of the first housing 110, and the outer housing 130 has a clearance hole 131 communicating with the through hole 111. The end of the button 430 near the transmission assembly 300 is located inside the clearance hole 131, and the end of the button 430 away from the transmission assembly 300 is located outside the clearance hole 131 to form a pressing part 431.

[0057] Specifically, the housing 100 includes a first housing 110 and a second housing 120 that are spliced ​​together front to back. The first housing 110 is located in front of the second housing 120. The rear end of the transmission assembly 300 is inserted into the first housing 110, and the front end of the transmission assembly 300 extends forward beyond the first housing 110. The motor assembly 200, with its motor shaft 210 facing forward, is installed in the second housing 120, and the front end of the motor shaft 210 extends into the first housing 110 and is connected to the rear end of the transmission assembly 300 for transmission. The first housing 110 typically has a gripping area for the operator to hold the power tool 1000, and an outer sleeve 130 is fitted over the first housing 110 to form a gripping sleeve. The outer sleeve 130 can be made of heat-insulating material.

[0058] The outer casing 130 has a clearance hole 131 corresponding to the through hole 111. The clearance hole 131 on the outer casing 130 is vertically aligned with the through hole 111 on the first housing 110. The lower end of the locking pin 410 passes through the clearance hole 131 and the through hole 111 in sequence and then extends into the first housing 110. The upper end of the locking pin 410 is located inside the clearance hole 131 or extends upward out of the clearance hole 131. The lower end of the button 430 is located inside the clearance hole 131. When the locking pin 410 is in the released position, the upper end of the button 430 extends upward out of the clearance hole 131 to form a pressing part 431.

[0059] Optionally, please refer to Figures 1 to 4 In this embodiment, the shape of the portion of button 430 located within the clearance hole 131 is adapted to the shape of the clearance hole 131. The shape of the lower end of button 430 is adapted to the shape of the clearance hole 131, so that the lower end of button 430 abuts against the inner surface of clearance hole 131, thereby improving the stability of shaft locking mechanism 400.

[0060] Optionally, please refer to Figures 1 to 4 In this embodiment, the pressing part 431 is provided with a pressing slope 432 facing away from the motor assembly 200. The pressing slope 432 is inclined in the direction away from the motor assembly 200 in the direction close to the transmission assembly 300. The pressing slope 432 is provided at the front end of the pressing part 431 and is inclined forward from top to bottom. By providing the pressing slope 432 on the pressing part 431, the comfort of the operator when pressing the button 430 can be improved.

[0061] The upper and lower ends of the elastic element 440 abut against the button 430 and the housing 100, respectively. The lower end of the elastic element 440 can abut against the outer surface of the first housing 110; the lower end of the elastic element 440 can also abut against the outer surface of the outer sleeve 130. Optionally, please refer to... Figures 1 to 4 In this embodiment, one end of the elastic member 440 near the transmission assembly 300 passes through the clearance hole 131 and abuts against the first housing 110. The lower end of the elastic member 440 extends into the clearance hole 131 and abuts against the outer surface of the first housing 110. Thus, the clearance hole 131 can limit the elastic member 440 and prevent the elastic member 440 from becoming loose.

[0062] Optionally, please refer to Figures 1 to 4 In this embodiment, a locking pin sleeve 112 is provided inside the through hole 111, and the locking pin sleeve 112 is sleeved outside the locking pin 410.

[0063] Specifically, a locking pin sleeve 112 is provided inside the through hole 111 to prevent the locking pin 410 from directly contacting the inner surface of the through hole 111. Thus, when the transmission component 300 stops at a slow speed and the locking pin 410 is abnormally pressed to lock, the through hole 111 is prevented from being impacted and enlarged, which would cause the shaft lock function to fail.

[0064] The locking pin sleeve 112 can be fixedly installed in the through hole 111 by means of snap-fit ​​connection, threaded connection, or interference fit. Optionally, please refer to Figures 1 to 4 In this embodiment, a threaded connection structure is provided between the outer surface of the locking pin sleeve 112 and the inner surface of the through hole 111. For example, the locking pin sleeve 112 can be a nut. The outer surface of the locking pin sleeve 112 is provided with an external thread, and the inner surface of the through hole 111 is provided with an internal thread that mates with the external thread. In this way, the locking pin sleeve 112 and the housing 100 are locked and fixed by the thread.

[0065] Optionally, please refer to Figures 1 to 4 In this embodiment, the inner surface of the through hole 111 is provided with a first stepped surface facing the transmission assembly 300, and the outer surface of the locking pin sleeve 112 is provided with a second stepped surface facing away from the transmission assembly 300. The second stepped surface abuts against the side of the first stepped surface near the transmission assembly 300. The inner surface of the through hole 111 is provided with a downward-facing first stepped surface, and the outer surface of the locking pin sleeve 112 is provided with an upward-facing second stepped surface. The second stepped surface abuts against the lower side of the first stepped surface. In this way, the locking pin sleeve 112 can be positioned at the through hole 111 by limiting the step surface of the locking pin sleeve 112 with the step surface at the through hole 111.

[0066] When the locking pin 410 is in the released position, the limiting member 420 can abut against the lower side of the inner surface of the first housing 110; the limiting member 420 can also abut against the lower side of the lower end face of the locking pin sleeve 112. Optionally, please refer to Figures 1 to 4 In this embodiment, when the locking pin 410 is in the released position, the limiting member 420 abuts against the locking pin sleeve 112.

[0067] The specific configuration of the limiting component 420 can be set according to the actual situation. For example, the limiting component 420 can be a nut, screw, pin, or retaining ring, etc. Optionally, please refer to... Figures 1 to 4 In this embodiment, the limiting member 420 is an open retaining ring, and the locking pin 410 has an annular mounting groove 411 at one end inside the housing 100. The open retaining ring is disposed at the annular mounting groove 411. By providing an annular mounting groove 411 at the lower end of the locking pin 410, and clamping the open retaining ring in the annular mounting groove 411, and by ensuring that the outer diameter of the open retaining ring is larger than the diameter of the through hole 111, the open retaining ring can be installed from inside the housing 100 to the lower end of the locking pin 410, making the installation of the open retaining ring more convenient.

[0068] When the transmission assembly 300 is in the locked state, the lower end of the locking pin 410 forms a limiting engagement with the transmission assembly 300. Optionally, please refer to Figures 1 to 4 In this embodiment, the transmission assembly 300 is provided with a locking hole 311; when the transmission assembly 300 is in the locked state, one end of the locking pin 410 located inside the housing 100 extends into the locking hole 311. In this way, the rotation of the transmission assembly 300 is restricted by the insertion and cooperation of the locking pin 410 and the locking hole 311, and the transmission assembly 300 can be locked well by the shaft locking mechanism 400.

[0069] Optionally, please refer to Figures 1 to 4 In this embodiment, the transmission assembly 300 includes an output shaft 310 and a transmission shaft sleeve 320. The end of the output shaft 310 near the motor assembly 200 is located inside the housing 100. The transmission shaft sleeve 320 is located between the motor shaft 210 and the output shaft 310 of the motor assembly 200. The two ends of the transmission shaft sleeve 320 are respectively sleeved on the outside of the motor shaft 210 and the output shaft 310, so that when the motor shaft 210 rotates, the output shaft 310 is driven to rotate through the transmission shaft sleeve 320. When the transmission assembly 300 is in the locked state, the end of the locking pin 410 located inside the housing 100 forms a limiting engagement with the output shaft 310 to restrict the rotation of the transmission assembly 300.

[0070] Specifically, the front end of the output shaft 310 is used to mount the end assembly 350, and the rear end of the output shaft 310 is connected to the front end of the motor shaft 210 via a transmission sleeve 320. A locking hole 311 is provided at the rear end of the output shaft 310. Flat rectangular structures are provided between the rear end of the output shaft 310 and the front end of the transmission sleeve 320, and between the front end of the motor shaft 210 and the rear end of the transmission sleeve 320, thereby enabling the output shaft 310 to rotate via the transmission sleeve 320 when the motor shaft 210 rotates.

[0071] Optionally, please refer to Figures 1 to 4 In this embodiment, a bearing 330 is fitted between the transmission shaft sleeve 320 and the housing 100.

[0072] Specifically, a bearing 330 is provided in the rear end of the first housing 110, and the transmission shaft sleeve 320 is pressed into the bearing 330. In this way, the transmission shaft sleeve 320 is supported by the bearing 330, which helps to ensure the coaxiality between the motor shaft 210, the output shaft 310, and the transmission shaft sleeve 320.

[0073] Further, please refer to Figures 1 to 4 In this embodiment, an elastic ring 340 is provided between the bearing 330 and the first housing 110. The bearing 330 and the first housing 110 are interference-fitted and equipped with an elastic ring 340, which can play a role in shock absorption.

[0074] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A power tool, characterized in that, include: The housing has through holes; A motor assembly, wherein the motor assembly is disposed within the housing; A transmission assembly, at least a portion of which is located within the housing and is dynamically coupled to the motor assembly, the motor assembly driving the transmission assembly to rotate; An end assembly, the end assembly being connected to the transmission assembly; A shaft locking mechanism includes a locking pin and a limiting member. The locking pin is movably disposed at the through hole. One end of the locking pin extends into the housing from the through hole. A pressing part is provided at the end of the locking pin away from the transmission component. The limiting member is disposed at the end of the locking pin located inside the housing. When the transmission assembly is in the locked state, the locking pin is in the locked position, with one end of the locking pin located inside the housing and forming a limiting engagement with the transmission assembly to restrict the rotation of the transmission assembly; when the transmission assembly is in the released state, the locking pin is in the released position, the locking pin is separated from the transmission assembly, and the limiting member abuts against the inner side of the housing to prevent the locking pin from popping out of the housing.

2. The power tool as described in claim 1, characterized in that, A button is provided at the end of the locking pin away from the transmission assembly, and a pressing part is provided on the part of the button located outside the housing; An elastic element is provided at the end of the locking pin away from the transmission component. The two ends of the elastic element abut against the button and the housing, respectively, so as to drive the locking pin to move back to the release position through the elastic element.

3. The power tool as described in claim 2, characterized in that, The housing includes: A first housing, wherein the transmission assembly is disposed within the first housing at one end near the motor assembly, and the through hole is provided on the first housing; The outer casing is fitted over the first housing, and the outer casing has a clearance hole that communicates with the through hole; The end of the button closer to the transmission component is located inside the clearance hole, and the end of the button farther from the transmission component is located outside the clearance hole, thus forming the pressing part.

4. The power tool as described in claim 3, characterized in that, The end of the elastic element near the transmission assembly passes through the clearance hole and abuts against the first housing; and / or The pressing part is provided with a pressing slope facing away from the motor assembly, and the pressing slope is inclined in a direction away from the motor assembly in the direction close to the transmission assembly; and / or, The shape of the portion of the button located within the clearance hole is adapted to the shape of the clearance hole.

5. The power tool as described in claim 1, characterized in that, A locking pin sleeve is provided inside the through hole, and the locking pin sleeve is fitted outside the locking pin.

6. The power tool as described in claim 5, characterized in that, The locking pin sleeve is a nut; and / or, A threaded connection structure is provided between the outer surface of the locking pin sleeve and the inner surface of the through hole; and / or, The inner surface of the through hole is provided with a first stepped surface facing the transmission assembly, and the outer surface of the locking pin sleeve is provided with a second stepped surface facing away from the transmission assembly. The second stepped surface abuts against the side of the first stepped surface near the transmission assembly.

7. The power tool as described in claim 5, characterized in that, When the locking pin is in the released position, the limiting member abuts against the locking pin sleeve.

8. The power tool as claimed in claim 1, characterized in that, The limiting component is an open retaining ring, and the locking pin has an annular mounting groove at one end inside the housing, with the open retaining ring positioned at the annular mounting groove.

9. The power tool as claimed in claim 1, characterized in that, The transmission assembly has a locking hole; when the transmission assembly is in the locked state, the end of the locking pin located inside the housing extends into the locking hole.

10. The power tool as claimed in claim 1, characterized in that, The transmission assembly includes: An output shaft, one end of which is located within the housing near the motor assembly; A drive shaft sleeve is located between the motor shaft and the output shaft of the motor assembly. The two ends of the drive shaft sleeve are respectively sleeved on the outside of the motor shaft and the output shaft so as to drive the output shaft to rotate through the drive shaft sleeve when the motor shaft rotates. When the transmission assembly is in the locked state, the end of the locking pin located inside the housing forms a limiting engagement with the output shaft to restrict the rotation of the transmission assembly.

11. The power tool as claimed in claim 10, characterized in that, A bearing is provided between the transmission shaft sleeve and the housing, and an elastic ring is provided between the bearing and the housing.

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