Electric tool

Abstract

The utility model relates to an electric tool which comprises the following components: an output shaft which is provided with a mounting hole which extends along the axial direction of the output shaft and a through hole which extends along the radial direction of the output shaft, and the mounting hole is communicated with the through hole and is used for mounting a bit; the locking element comprises a clamping ring part, a connecting part and a locking bulge, and the clamping ring part is used for tightly holding the output shaft; the connecting part is connected to the clamping ring part, and the first end of the connecting part extends in the front-back direction of the electric tool and is away from the clamping ring part. The locking bulge is connected to the connecting part; when the screwdriver head is assembled, the connecting part deforms, so that the locking protrusion moves, and then the screwdriver head can be inserted in place. And when the screwdriver head is inserted in place, the connecting part recovers the deformation, so that the locking bulge locks the screwdriver head. According to the electric tool, the structure of the locking element is optimized, the installation procedures of the locking element are reduced, and the assembling difficulty of the locking element is lowered.

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] Screwdriver bits are one of the most commonly used tool bits in power tools. There are two main ways to insert, remove, and lock screwdriver bits:

[0003] (1) The locking ball is installed in the radial hole of the output shaft by the cooperation of the retaining ring and the locking ball. The retaining ring hugs the outer circumference of the output shaft and presses the locking ball in the radial direction of the output shaft so that the locking ball locks the bit inserted into the output shaft.

[0004] (2) Figure 1 As shown, the retaining ring and the locking ball are combined into one part (locking element). A protrusion 1b is provided on the inner side wall of the retaining ring 1a. The retaining ring 1a hugs the output shaft, and the protrusion 1b extends into the radial hole on the output shaft. The bit inserted into the output shaft is locked by the protrusion 1b.

[0005] For the plug-in locking method (1), there are many parts, the installation is complicated, and the increase in the number of parts leads to more failure points and increases the risk.

[0006] For the plug-in locking method (2), the installation tools can be reduced. However, since the retaining ring and the locking ball are combined into one part, when the part used to lock the bit is assembled on the output shaft, the retaining ring 1a needs to deform so that the protrusion 1b can be inserted into the radial hole of the output shaft. In addition, during the insertion of the bit, the retaining ring 1a also needs to deform so that the protrusion 1b moves outward along the radial direction of the output shaft so that the bit can be inserted into place. Since the protrusion 1b needs to lock the bit, the elasticity of the retaining ring 1a is restricted, which makes it more difficult to install the retaining ring 1a on the output shaft. Utility Model Content

[0007] Based on the aforementioned deficiencies in the existing technology, the purpose of this utility model is to provide an electric tool that optimizes the structure of the locking element, reduces the installation steps of the locking element, and lowers the assembly difficulty of the locking element.

[0008] Therefore, the present invention provides the following technical solution.

[0009] This utility model provides an electric tool, the electric tool comprising:

[0010] An output shaft has a mounting hole extending axially therein and a through hole extending radially therein, the mounting hole communicating with the through hole and used to mount a bit;

[0011] A locking element includes a retaining ring portion, a connecting portion, and a locking protrusion. The retaining ring portion is used to hold the output shaft. The connecting portion is connected to the retaining ring portion, and its first end extends along the front-rear direction of the power tool and is away from the retaining ring portion. The locking protrusion is connected to the connecting portion and inserted into the through hole to lock the bit.

[0012] When the bit is assembled, the connecting part deforms to move the locking protrusion, thereby allowing the bit to be inserted into place; when the bit is inserted into place, the connecting part returns to its original shape so that the locking protrusion locks the bit.

[0013] Optionally, the central axis of the retaining ring portion coincides with the central axis of the output shaft;

[0014] And / or, the first end extends axially along the output shaft.

[0015] Optionally, the retaining ring portion is engaged with the outer periphery of the output shaft to hold the output shaft tightly;

[0016] And / or, the connecting part is snapped onto the output shaft;

[0017] And / or, the retaining ring portion is C-shaped.

[0018] Optionally, the second end of the connecting portion is connected to the retaining ring portion;

[0019] And / or, the locking element is a resilient steel structure;

[0020] And / or, the outer contour shape of the output shaft is configured to accommodate a sleeve for tightening bolts.

[0021] Optionally, the output shaft has multiple mounting positions, and the locking element is mounted in any one of the mounting positions;

[0022] The length of the connecting part of the locking element is different for different installation positions, so as to adjust the locking force of the locking protrusion.

[0023] Optionally, the retaining ring portion has multiple mounting positions in the axial direction of the output shaft, and the spacing between the retaining ring portion and the through hole is different for different mounting positions, so that the length of the connecting portion can be different.

[0024] Optionally, the output shaft is provided with a plurality of first slots, all of which are distributed sequentially along the axial direction of the output shaft, and the retaining ring portion is engaged in any one of the first slots;

[0025] The positions of all the first slots are different, so that the output shaft has multiple mounting positions; the spacing between the different first slots and the through holes is different, so that the length of the connecting part can be different.

[0026] Optionally, the output shaft is provided with a second slot that communicates with the first slot; the through hole is located in the corresponding second slot, and the connecting part is engaged with the corresponding second slot.

[0027] Optionally, at least two of the through holes are sequentially distributed along the axial direction of the output shaft to form a through hole group, so that the output shaft has multiple mounting positions; the connecting part is matched with the through hole group one by one, and the locking protrusion is inserted into any one of the through holes in the corresponding through hole group;

[0028] The spacing between different through holes in the through hole group and the retaining ring portion is different, thereby allowing the length of the connecting portion to be different.

[0029] Optionally, the output shaft is provided with a first slot and a second slot that are connected to each other, and the through holes are matched one by one in the second slot; the retaining ring is engaged in the first slot, and the connecting part is engaged in the second slot.

[0030] This utility model has the following technical effects:

[0031] This utility model provides an electric tool that optimizes the structure of the locking element. On the one hand, the retaining ring and the locking protrusion are combined into one part, reducing the installation steps. On the other hand, a connecting part is added to the locking element and the extension direction of the connecting part is defined. In this way, the locking force of the locking protrusion on the bit is determined by the elasticity of the connecting part, and the magnitude of the locking force is independent of the elasticity of the retaining ring. The elasticity of the retaining ring and the connecting part can be defined separately. The elasticity of the retaining ring can be defined according to the requirements of clamping force and assembly difficulty, which helps to reduce the assembly difficulty of the locking element. The elasticity of the connecting part can be defined according to the locking force requirements of the locking protrusion, which helps to ensure that the locking element can stably lock the bit. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a locking element in the prior art;

[0033] Figure 2 This is a structural cross-sectional view of the power tool with a relatively long connecting portion in the first embodiment of this utility model;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4This is a cross-sectional view of the power tool in the first embodiment of the present invention when the connecting part is relatively short;

[0036] Figure 5 for Figure 4 Enlarged view at point B in the middle;

[0037] Figure 6 This is an exploded view of the assembly structure of the output shaft and the locking element when the connecting part is relatively long in the first embodiment of this utility model;

[0038] Figure 7 This is a schematic diagram of the assembly structure of the output shaft and the locking element when the connecting part is relatively long in the first embodiment of this utility model;

[0039] Figure 8 This is an exploded view of the assembly structure of the output shaft and the locking element when the connecting part is relatively short in the first embodiment of this utility model;

[0040] Figure 9 This is a schematic diagram of the assembly structure of the output shaft and the locking element when the connecting part is relatively short in the first embodiment of this utility model;

[0041] Figure 10 This is an exploded view of the assembly structure of the output shaft and the locking element when the connecting part is relatively long in the second embodiment of this utility model.

[0042] Figure 11 This is a schematic diagram of the assembly structure of the output shaft and the locking element when the connecting part is relatively long in the second embodiment of this utility model;

[0043] Figure 12 This is an exploded view of the assembly structure of the output shaft and the locking element when the connecting part is shorter in the second embodiment of this utility model;

[0044] Figure 13 This is a schematic diagram of the assembly structure of the output shaft and the locking element when the connecting part is shorter in the second embodiment of this utility model.

[0045] Explanation of reference numerals in the attached figures

[0046] 100. Power tools;

[0047] 1. Output shaft; 11. Mounting hole; 12. Through hole; 13. First slot; 14. Second slot; 15. Mounting part;

[0048] 2. Locking element; 21. Snap ring portion; 22. Connecting portion; 221. First end; 23. Locking protrusion;

[0049] 3. Electric motor;

[0050] 4. Transmission components;

[0051] 1a. Snap ring; 1b. Protrusion. Detailed Implementation

[0052] To make the technical solution and beneficial effects of this utility model 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.

[0053] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0054] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0055] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0057] In this utility model, "front," "rear," "upper," and "lower" all refer to... Figure 2 and Figure 4 The markings in the text shall prevail.

[0058] The following is based on Figures 2 to 13 This utility model describes the power tool in detail.

[0059] In this embodiment, such as Figures 2 to 13 As shown, the power tool 100 includes an output shaft 1, a locking element 2, a motor 3, and a transmission assembly 4. The output shaft 1 has a mounting hole 11 extending axially and a through hole 12 extending radially. The mounting hole 11 communicates with the through hole 12 and is used to mount a screwdriver bit (not shown). When the power tool 100 is started, the torque output by the motor 3 is transmitted to the output shaft 1 through the transmission assembly 4, causing the output shaft 1 to drive the screwdriver bit to rotate. The locking element 2 includes a retaining ring portion 21, a connecting portion 22, and a locking protrusion 23. The connecting portion 22 is connected to the retaining ring portion 21, and the locking protrusion 23 is connected to the inner sidewall of the connecting portion 22. The retaining ring portion 21 is used to grip the output shaft 1 to assemble the locking element 2 onto the output shaft 1. The first end 221 of the connecting portion 22 extends along the front-rear direction of the power tool 100 and is away from the retaining ring portion 21.

[0060] like Figure 3 , Figure 6 and Figure 7 As shown, when the locking element 2 is assembled on the output shaft 1, the retaining ring 21 deforms so that the retaining ring 21 can fit on the outer peripheral wall of the output shaft 1 and hold the output shaft 1 tightly, and the connecting part 22 deforms so that the locking protrusion 23 can be smoothly inserted into the through hole 12.

[0061] like Figure 3As shown, when assembling the bit, the bit presses the locking protrusion 23 radially outward along the output shaft 1, causing the connecting portion 22 to deform. This allows the locking protrusion 23 to move radially outward along the output shaft 1 under the pressure of the bit, enabling the bit to be inserted into place. When the bit is inserted into place, the locking protrusion 23 aligns with the groove on the outer peripheral wall of the bit, and the locking protrusion 23 extends into the groove. The connecting portion 22 then returns to its original shape, allowing the locking protrusion 23 to lock the bit in place.

[0062] In the above technical solution, by optimizing the structure of the locking element 2, on the one hand, the retaining ring portion 21 and the locking protrusion 23 are merged into one part, and the locking element 2 is an integrally formed structure, reducing the installation process. On the other hand, a connecting portion 22 is added to the locking element 2 and the extension direction of the connecting portion 22 is defined. In this way, the locking force of the locking protrusion 23 on the bit is determined by the elasticity of the connecting portion 22, and the magnitude of the locking force is independent of the elasticity of the retaining ring portion 21. Thus, the elasticity of the retaining ring portion 21 and the connecting portion 22 can be defined separately. The elasticity of the retaining ring portion 21 can be defined according to the requirements of clamping force and assembly difficulty, which helps to reduce the assembly difficulty of the locking element 2. The elasticity of the connecting portion 22 can be defined according to the locking force requirements of the locking protrusion 23, which helps to ensure that the locking element 2 can stably lock the bit.

[0063] In one implementation, such as Figure 3 and Figure 6 As shown, there are two connecting parts 22, and each connecting part 22 has a locking protrusion 23 on its inner sidewall. The two locking protrusions 23 extend into the groove of the bit from opposite directions, improving the stability of the locking element 2 in locking the bit. Of course, the number of connecting parts 22 can also be three or even more.

[0064] In one implementation, such as Figure 3 and Figure 6 As shown, the connecting part 22 is recessed in the direction toward the output shaft 1 to form a locking protrusion 23.

[0065] In one implementation, such as Figure 3 and Figure 6 As shown, the central axis of the retaining ring portion 21 coincides with the central axis of the output shaft 1, that is, the retaining ring portion 21 is annular or approximately annular and extends circumferentially along the output shaft 1.

[0066] In one implementation, such as Figure 3 and Figure 6 As shown, the first end 221 extends along the axial direction of the output shaft 1. Of course, the extension direction of the first end 221 can also be at an angle to the central axis of the output shaft 1.

[0067] In one implementation, such as Figure 7 , Figure 9 , Figure 11 and Figure 13 As shown, the retaining ring 21 is engaged with the outer periphery of the output shaft 1 to hold the output shaft 1 tightly. The engagement of the two can improve the assembly stability of the retaining ring 21 and prevent the retaining ring 21 from being displaced or deformed along the axial direction of the output shaft 1 under external force.

[0068] In one implementation, such as Figure 7 , Figure 9 , Figure 11 and Figure 13 As shown, the connecting part 22 is snapped into the output shaft 1, which can prevent the connecting part 22 from being displaced or deformed along the circumference of the output shaft 1 under external force, and thus avoid affecting the locking force of the locking protrusion 23 on the bit.

[0069] In one implementation, such as Figure 6 and Figure 8 As shown, the retaining ring portion 21 is C-shaped, meaning it has an opening. This allows the retaining ring portion 21 to be opened during the assembly of the locking element 2, enabling it to be quickly fitted onto the output shaft 1 for easy installation. Alternatively, the retaining ring portion 21 can be annular, in which case it needs to be opened forcefully during assembly.

[0070] In one implementation, such as Figure 6 and Figure 8 As shown, the second end of the connecting portion 22 is connected to the retaining ring portion 21, that is, the connecting portion 22 extends outward from the side wall of the retaining ring portion 21 on one radial side. Of course, the connecting portion 22 can also be in a cross shape with the retaining ring portion 21, that is, part of the structure of the connecting portion 22 is located on one radial side of the retaining ring portion 21, and the rest of the structure is located on the other radial side of the retaining ring portion 21.

[0071] In one embodiment, the locking element 2 is an elastic steel structure, which has good elasticity and is strong.

[0072] In one implementation, such as Figure 6 As shown, the outer contour shape of the output shaft 1 is configured to accommodate a sleeve (not shown in the figure). Specifically, a mounting portion 15 is formed at the front end of the output shaft 1, and the outer contour shape of the mounting portion 15 is adapted to the hole of the sleeve. Thus, when the power tool 100 is used as a screwdriver, the bit is inserted into the mounting hole 11 and locked by the locking element 2, and the screw is loaded and unloaded by the bit; when the power tool 100 is used as a wrench, the sleeve is mounted on the mounting portion 15, and the bolt is loaded and unloaded by the sleeve.

[0073] In one implementation, such as Figures 2 to 13As shown, the output shaft 1 has multiple mounting positions, and the locking element 2 is installed in any of these positions. The length of the connecting portion 22 of the locking element 2 varies depending on the mounting position, thus adjusting the locking force of the locking protrusion 23. In this design, the locking element 2 has multiple mounting positions on the output shaft 1. Different mounting positions can be matched with locking elements 2 of different connecting portion 22 lengths. Changing the length of the connecting portion 22 alters its elasticity, thereby changing the locking force provided by the locking protrusion 23. The longer the connecting portion 22, the smaller the locking force of the locking protrusion 23. Therefore, by replacing locking elements 2 with different specifications, different locking force requirements can be met, resulting in wider applications.

[0074] First Implementation Method

[0075] The following is based on Figures 2 to 9 This invention describes in detail the electric tool according to the first embodiment of the present invention.

[0076] In this embodiment, such as Figures 2 to 9 As shown, the retaining ring 21 has multiple mounting positions in the axial direction of the output shaft 1. The spacing between the retaining ring 21 and the through hole 12 is different for different mounting positions. In this way, by adjusting the mounting position of the retaining ring 21, the length of the matching connecting part 22 can be adjusted, and the locking force provided by the locking protrusion 23 can be adjusted.

[0077] Furthermore, such as Figures 2 to 9 As shown, the output shaft 1 has two first retaining slots 13, which are sequentially distributed along the axial direction of the output shaft 1. The first retaining slots 13 extend circumferentially along the output shaft 1 and are annular. The retaining ring portion 21 is engaged in either of the first retaining slots 13, and the first retaining slots 13 can restrict the retaining ring portion 21 from displacement or deformation along the axial direction of the output shaft 1. Specifically, as... Figures 6 to 9 As shown, the first slot 13 and the second slot 13 are distributed sequentially from back to front, and the through hole 12 is located in front of the two slots 13, as shown. Figure 6 and Figure 7 As shown, when the retaining ring 21 is engaged in the first retaining groove 13, the length of the connecting part 22 is relatively long, and the locking force of the locking protrusion 23 is relatively small; as Figure 8 and Figure 9 As shown, when the retaining ring 21 is engaged in the second first retaining groove 13, the length of the connecting part 22 is shorter, and the locking force of the locking protrusion 23 is greater.

[0078] In the above technical solution, the two first slots 13 are positioned differently, allowing the retaining ring portion 21 of the locking element 2 to have two mounting positions on the output shaft 1. Furthermore, the distances between the different first slots 13 and the through holes 12 are different, enabling the output shaft 1 to accommodate two different specifications of locking elements 2. The locking elements 2 of different specifications are equipped with connecting portions 22 of different lengths. By selecting the appropriate specification of locking element 2, a corresponding locking force can be provided. Of course, the number of first slots 13 is not limited to two; it can also be three, four, or even more, to accommodate more specifications of locking elements 2.

[0079] Furthermore, such as Figures 6 to 9 As shown, the output shaft 1 has two second slots 14, which are respectively connected to the first slot 13. The second slots 14 extend along the axial direction of the output shaft 1 and are elongated. There are two through holes 12 and two connecting parts 22. The through holes 12 are matched one-to-one in the second slots 14, and the connecting parts 22 are engaged one-to-one in the second slots 14. The second slots 14 can restrict the connecting parts 22 from displacing or deforming along the circumferential direction of the output shaft 1. Of course, the number of second slots 14 is not limited to two, as long as the number of second slots 14, connecting parts 22, and through holes 12 are matched.

[0080] Second Implementation Method

[0081] The following is based on Figures 10 to 13 This invention provides a detailed description of the second embodiment of the power tool.

[0082] In this embodiment, such as Figures 10 to 13 As shown, there are four through holes 12. Two through holes 12 form a through hole group, and the two through hole groups are located on the radial sides of the output shaft 1 respectively. The two through holes 12 in each group are distributed sequentially along the axial direction of the output shaft 1, so that the output shaft 1 has multiple installation positions. The connecting part 22 is matched with the through hole group one by one, and the locking protrusion 23 is inserted into any one of the through holes 12 in the corresponding through hole group. Specifically, in each through hole group, the first through hole 12 and the second through hole 12 are distributed sequentially from back to front, and the first slot 13 is located behind the two through holes 12, as shown. Figure 10 and Figure 11 As shown, when the locking protrusion 23 is inserted into the second through hole 12, the length of the connecting part 22 is relatively long, and the locking force of the locking protrusion 23 is relatively small; as Figure 12 and Figure 13 As shown, when the locking protrusion is inserted into the first through hole 12, the length of the connecting part 22 is relatively short, and the locking force of the locking protrusion 23 is relatively large.

[0083] In the above technical solution, the two through holes 12 in each through hole group are positioned differently, so that the locking protrusion 23 of the locking element 2 has two mounting positions on the output shaft 1. Furthermore, the distance between the different through holes 12 and the retaining ring portion 21 is different, allowing the output shaft 1 to be matched with two specifications of locking elements 2. Different specifications of locking elements 2 are equipped with connecting portions 22 of different lengths. By selecting the appropriate specification of locking element 2, a corresponding locking force can be provided. In addition, since each through hole group has two through holes 12 in different positions, the mounting position of the locking protrusion 23 on the output shaft 1 can be adjusted. Therefore, the power tool 100 of this embodiment can be used for both unidirectional and bidirectional bits, and can adapt to bits with different locking positions.

[0084] Of course, the number of through holes 12 in each through hole group is not limited to two, but can be three, four or even more, to accommodate more specifications of locking elements 2; the number of through hole groups is also not limited to two, but can be one, three or even more, and the number of through hole groups matches the number of connecting parts 22.

[0085] Furthermore, such as Figures 10 to 13 As shown, the output shaft 1 has a first slot 13 and two second slots 14 that are connected to each other. The first slot 13 extends circumferentially along the output shaft 1 and is annular. The second slots 14 extend axially along the output shaft 1 and are elongated. The through holes are matched one-to-one in the second slots 14. The retaining ring 21 is engaged in the first slot 13, which restricts the retaining ring 21 from displacement or deformation along the axial direction of the output shaft 1. The connecting part 22 is engaged in the second slots 14, which restricts the connecting part from displacement or deformation along the circumferential direction of the output shaft 1. Of course, the number of second slots 14 is not limited to two, as long as the number of second slots 14, connecting parts 22, and through holes are matched.

[0086] 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 utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. A power tool characterized by comprising: The electric tool (100) comprises: an output shaft (1) provided with a mounting hole (11) extending along the axial direction thereof and a through hole (12) extending along the radial direction thereof, the mounting hole (11) being communicated with the through hole (12) and used for mounting a chuck; a locking element (2) comprising a clamping ring portion (21), a connecting portion (22) and a locking protrusion (23), the clamping ring portion (21) being used for clamping the output shaft (1); the connecting portion (22) being connected to the clamping ring portion (21) and having a first end (221) extending along the front-rear direction of the electric tool (100) and away from the clamping ring portion (21); the locking protrusion (23) being connected to the connecting portion (22) and inserted into the through hole (12) to lock the chuck; wherein, when the chuck is assembled, the connecting portion (22) is deformed to move the locking protrusion (23), so that the chuck can be inserted into position; when the chuck is inserted into position, the connecting portion (22) restores the deformation to lock the chuck by the locking protrusion (23).

2. The power tool of claim 1, wherein, the central axis of the clamping ring portion (21) coincides with the central axis of the output shaft (1); and / or, the first end (221) extends along the axial direction of the output shaft (1).

3. The power tool of claim 1, wherein, the clamping ring portion (21) is clamped on the outer periphery of the output shaft (1) to clamp the output shaft (1); and / or, the connecting portion (22) is clamped on the output shaft (1); and / or, the clamping ring portion (21) is in the shape of a C letter.

4. The power tool of claim 1, wherein, the second end of the connecting portion (22) is connected to the clamping ring portion (21); and / or, the locking element (2) is a resilient steel structure; and / or, the outer contour of the output shaft (1) is configured to be able to mount a sleeve, and the sleeve is used to screw a bolt.

5. The power tool of any of claims 1-4, wherein, the output shaft (1) has a plurality of mounting positions, and the locking element (2) is mounted at any one of the mounting positions; the lengths of the connecting portions (22) of the locking elements (2) matched with different mounting positions are different to adjust the locking force of the locking protrusions (23).

6. The power tool of claim 5, wherein, the clamping ring portion (21) has a plurality of mounting positions in the axial direction of the output shaft (1), and the distances between the clamping ring portions (21) matched with different mounting positions and the through hole (12) are different to enable the lengths of the connecting portions (22) to be different.

7. The power tool of claim 6, wherein, the output shaft (1) is provided with a plurality of first clamping grooves (13), all of the first clamping grooves (13) are sequentially distributed along the axial direction of the output shaft (1), and the clamping ring portion (21) is clamped in any one of the first clamping grooves (13); the positions of all of the first clamping grooves (13) are different, so that the output shaft (1) has a plurality of mounting positions; and the distances between different first clamping grooves (13) and the through hole (12) are different to enable the lengths of the connecting portions (22) to be different.

8. The power tool of claim 7, wherein, the output shaft (1) is provided with a second clamping groove (14) communicated with the first clamping groove (13); the through hole (12) is located in the corresponding second clamping groove (14), and the connecting portion (22) is clamped in the corresponding second clamping groove (14).

9. The power tool of claim 5, wherein, At least two of the through holes (12) are arranged along the axial direction of the output shaft (1) in sequence and form a through hole group, so that the output shaft (1) has a plurality of mounting positions; the connecting part (22) is arranged in one-to-one correspondence with the through hole group, and the locking protrusion (23) is inserted into any one of the through holes (12) of the corresponding through hole group; The distance between the different through holes (12) in the through hole group and the collar part (21) is different, so that the length of the connecting part (22) can be different.

10. The power tool of claim 9, wherein, The output shaft (1) is provided with a first clamping groove (13) and a second clamping groove (14) connected in communication, and the through hole group is arranged in one-to-one correspondence in the second clamping groove (14); the collar part (21) is clamped in the first clamping groove (13), and the connecting part (22) is clamped in the second clamping groove (14).

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