Power tool

Abstract

The utility model relates to an electric tool, electric tool includes: casing, output shaft, its first end is inserted in the casing, output shaft is equipped with the mounting hole and radial through -hole of intercommunication, the mounting hole extends along the axis of output shaft, and it is used to install tool head, quick -wearing assembly, it includes elastic locking element and locking part, locking part is movably inserted in radial through -hole, elastic locking element presses the locking part along the direction of the axis of output shaft, when tool head is installed to the mounting hole, locking part is pressed under the elastic locking element, and locking tool head, wherein, limit first plane to be the plane parallel with the axis of output shaft, and the projection of elastic locking element and casing both on first plane at least partly overlaps, the utility model discloses electric tool, through the position relation of the improvement elastic locking element installed on output shaft and casing, can shorten the axial length of output shaft, and then be favorable to shortening the whole length of electric tool.

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] Electric drills are widely used due to their high torque and ease of use, and are commonly used for drilling and screwing. An electric drill mainly consists of a motor, a transmission mechanism, and an output shaft. The output shaft is rotatably mounted in the drill bit housing, and the drill bit can be quickly attached to and removed from the output shaft via a quick-release assembly.

[0003] The quick-install assembly mainly includes an elastic locking sleeve and a locking element. The output shaft has an axial recess and a radial through hole. The locking element is movably installed in the radial through hole. The locking sleeve is fitted around the outer circumference of the output shaft, and the locking sleeve presses against the locking element in a radially inward direction along the output shaft. When installing the drill bit, the drill bit is inserted into the axial recess. In the initial stage of drill bit insertion, the outer circumferential wall of the drill bit presses against the locking element in a radially outward direction along the output shaft, causing the locking element to move a certain amount in a radially outward direction, thus allowing the drill bit to be smoothly inserted into the axial recess. Furthermore, the locking element expands the elastic locking sleeve during its outward movement. When the drill bit is installed in place, the cavity on the circumferential wall of the drill bit is aligned with the radial through hole. Under the rebound force of the elastic locking sleeve, the locking element moves radially inward, allowing it to partially extend into the cavity of the drill bit, thereby locking the drill bit and preventing axial movement.

[0004] In existing electric drills, the radial through hole of the output shaft is located outside the gearbox head housing of the drill, and there is a certain gap between the radial through hole and the front end face of the gearbox head housing. This is not conducive to reducing the length of the output shaft, and thus not conducive to the miniaturization design of the whole machine. Utility Model Content

[0005] Based on the aforementioned deficiencies in the prior art, the purpose of this utility model is to provide a power tool that, by improving the positional relationship between the elastic locking element installed on the output shaft and the housing, makes the projections of the elastic locking element and the housing on the first plane at least partially overlap, thereby shortening the axial length of the output shaft and thus helping to shorten the overall length of the power tool.

[0006] Therefore, the present invention provides the following technical solution.

[0007] This utility model provides an electric tool, the electric tool comprising:

[0008] chassis;

[0009] An output shaft, the first end of which is inserted into the housing; the output shaft is provided with an interconnected mounting hole and a radial through hole; the mounting hole extends along the axis of the output shaft and is used to mount a tool head;

[0010] A quick-release assembly includes an elastic locking element and a locking component, the locking component being movably inserted into the radial through hole, the elastic locking element pressing against the locking component in a direction toward the axis of the output shaft;

[0011] When the tool head is installed into the mounting hole, the locking component locks the tool head under the pressure of the elastic locking element;

[0012] The first plane is defined as a plane parallel to the axis of the output shaft, and the projections of the elastic locking element and the housing on the first plane at least partially overlap.

[0013] Optionally, the outer peripheral wall of the output shaft is further provided with an annular groove, which communicates with the radial through hole; the elastic locking element is annular and is engaged in the annular groove.

[0014] Optionally, the power tool further includes a bearing, and the output shaft is rotatably connected to the housing via the bearing; a first seal is provided between the inner wall of the front end of the housing and the front end face of the bearing, and the first seal is used to seal the gap between the front end of the housing and the outer peripheral wall of the output shaft.

[0015] Optionally, the resilient locking element is located in front of the first seal.

[0016] Optionally, the projections of the resilient locking element and the bearing onto the first plane at least partially overlap.

[0017] Optionally, the inner ring of the bearing is provided with a relief groove, which is positioned radially opposite to the elastic locking element on the output shaft. The relief groove is used to form a deformable space for the elastic locking element to deform outward.

[0018] Optionally, a second seal is provided between the outer ring of the bearing and the inner wall of the housing.

[0019] Optionally, the distance between the end face of the second end of the output shaft and the front end face of the housing is less than or equal to 20 mm.

[0020] Optionally, the resilient locking element includes a rubber ring, a steel ring, or a coil spring.

[0021] Optionally, the locking component includes at least one steel ball or at least one ball-head pin.

[0022] Optionally, the mounting hole is a through hole structure, which includes a first mounting hole and a second mounting hole distributed sequentially from front to back along the power tool, wherein the first mounting hole is used to mount the tool head;

[0023] The power tool also includes a sealing structure that is detachably mounted in the second mounting hole, the sealing structure being used to prevent lubricating oil in the housing from entering the first mounting hole.

[0024] This utility model has the following technical effects:

[0025] This utility model provides an electric tool that improves the positional relationship between the elastic locking element installed on the output shaft and the housing, so that the projections of the elastic locking element and the housing on the first plane at least partially overlap. This can shorten the distance between the elastic locking element and the first end of the output shaft, that is, shorten the distance between the radial through hole and the first end of the output shaft, thereby shortening the axial length of the output shaft and helping to shorten the overall length of the electric tool. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the power tool of this utility model;

[0027] Figure 2 This is a structural cross-sectional view of the power tool in the first embodiment of this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is an exploded view of the assembly structure of the main shaft, output shaft, and sealing structure in the first embodiment of this utility model;

[0030] Figure 5 This is an exploded view of the assembly structure of the output shaft and the sealing structure in the first embodiment of this utility model;

[0031] Figure 6 This is a structural cross-sectional view of the power tool in the second embodiment of this utility model;

[0032] Figure 7 This is a cross-sectional view of the output shaft of this utility model;

[0033] Figure 8 This is a cross-sectional view of the power tool in the third embodiment of this utility model;

[0034] Figure 9 for Figure 8 Enlarged view at point B in the middle;

[0035] Figure 10 This is a three-dimensional structural diagram of the sealing structure in the third embodiment of this utility model.

[0036] Explanation of reference numerals in the attached figures

[0037] 100. Power tools;

[0038] 1. Housing;

[0039] 2. Output shaft; 21. Mounting hole; 211. First mounting hole; 212. Second mounting hole; 213. First protrusion; 22. Radial through hole; 23. Annular groove; 24. First end; 25. Second end; 26. Lug; 27. Shaft body;

[0040] 3. Quick-release assembly; 31. Elastic locking element; 32. Locking component;

[0041] 4. Bearing; 41. Relief groove;

[0042] 51. First seal; 52. Second seal;

[0043] 6. Sealing structure; 61. Annular protrusion; 62. Groove; 63. Second protrusion; 64. Rubber sealing ring; 641. Insertion protrusion; 65. Metal plug; 651. Metal substrate; 6511. Slot; 652. Metal post; 6521. Outer end of metal post;

[0044] 7. Motor; 71. Rotor shaft;

[0045] 8. Transmission assembly; 81. Reduction mechanism; 811. Sun gear; 812. Planet gears; 813. Internal gear ring; 82. Main shaft; 821. Support end; 83. Impact mechanism; 831. Impact block; 832. Rolling ball; 833. Spring;

[0046] 200. Tool head; 201. Concave part. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] In this utility model, "front," "rear," "left," "right," "up," and "down" all refer to... Figure 1 , Figure 2 and Figure 8 The markings in the text shall prevail.

[0053] The following is based on Figures 1 to 10 This utility model describes the power tool in detail.

[0054] In this embodiment, such as Figures 1 to 3 , Figure 7 As shown, the power tool 100 includes a housing 1, an output shaft 2, and a quick-release assembly 3. The housing 1 forms the outer contour structure of the power tool 100. The first end 24 of the output shaft 2 is inserted into the housing 1, and the second end 25 of the output shaft 2 extends to the outside of the housing 1. The output shaft 2 has a mounting hole 21 and a radial through hole 22 that communicate with each other. The radial through hole 22 extends radially along the output shaft 2, and the mounting hole 21 extends along the axis of the output shaft 2. The tool head 200 is inserted into the mounting hole 21 from the second end 25 of the output shaft 2.

[0055] The quick-release assembly 3 includes an elastic locking element 31 and a locking member 32. The locking member 32 is movably inserted into the radial through hole 22. The elastic locking element 31 presses against the locking member 32 in a direction toward the axis of the output shaft 2. When the tool head 200 is installed into the mounting hole 21, the locking member 32, under the pressure of the elastic locking element 31, will press against the tool head 200, thereby locking the tool head 200 and preventing the tool head 200 from disengaging from the mounting hole 21. In one specific embodiment, the elastic locking element 31 presses against the locking member 32 radially inward along the output shaft 2. Of course, the direction of the pressure applied by the elastic locking element 31 to the locking member 32 does not have to be completely parallel to the radial direction of the output shaft 2. The direction of the pressure can also be intersecting the radial direction of the output shaft 2, as long as it can press the locking member 32 against the peripheral surface wall of the output shaft 2. The first plane is defined as a plane parallel to the axis of the output shaft 2, and the projections of the elastic locking element 31 and the housing 1 on the first plane at least partially overlap, that is, the elastic locking element 31 is at least partially located in the housing 1.

[0056] In the above technical solution, by improving the positional relationship between the elastic locking element 31 and the housing 1, the projections of the elastic locking element 31 and the housing 1 on the first plane overlap at least partially, which can shorten the distance between the elastic locking element 31 and the first end 24 of the output shaft 2, that is, shorten the distance between the radial through hole 22 and the first end 24 of the output shaft 2, thereby shortening the axial length of the output shaft 2, which is beneficial to shortening the overall length of the power tool 100.

[0057] In one implementation, such as Figure 3 , Figure 4 and Figure 7 As shown, the outer peripheral wall of the output shaft 2 is also provided with an annular groove 23, which is connected to the radial through hole 22. The elastic locking element 31 is annular and is engaged in the annular groove 23. In this way, the elastic locking element 31 is easy to assemble and the elastic locking element 31 is not easy to shift.

[0058] In one implementation, such as Figure 3 As shown, the power tool 100 also includes a bearing 4, and the output shaft 2 is rotatably connected to the housing 1 through the bearing 4; a first seal 51 is provided between the inner wall of the front end of the housing 1 and the front end face of the bearing 4. The first seal 51 is used to seal the gap between the front end of the housing 1 and the outer peripheral wall of the output shaft 2 to prevent the lubricating oil inside the housing 1 from leaking outward from the gap between the housing 1 and the output shaft 2.

[0059] Furthermore, such as Figure 3 As shown, a second seal 52 is provided between the outer ring of the bearing 4 and the inner wall of the housing 1 to further prevent the lubricating oil inside the housing 1 from leaking outward from the gap between the housing 1 and the output shaft 2.

[0060] In one implementation, such as Figure 2 and Figure 8 As shown, the distance between the end face of the second end 25 of the output shaft 2 and the front end face of the housing 1 is less than or equal to 20mm. This solution, by improving the positional relationship between the elastic locking element 31 and the housing 1, can shorten the distance between the end face of the second end 25 of the output shaft 2 and the front end face of the housing 1 to less than or equal to 20mm, thereby helping to shorten the overall length of the power tool 100.

[0061] In one embodiment, the elastic locking element 31 includes a rubber ring, a steel ring, or a coil spring, which has a simple structure and good elastic force.

[0062] In one implementation, such as Figure 3 As shown, the locking component 32 includes at least one steel ball or at least one ball-head pin, and has a simple structure. Specifically, the outer peripheral surface of the tool head 200 is provided with a recess 201. During the process of installing the tool head 200 into the mounting hole 21, in the initial stage of installation, the end of the tool head 200 will press the locking component 32 radially outward along the output shaft 2. The locking component 32 will push the elastic locking element 31 outward, and the elastic locking element 31 will undergo elastic deformation, so that the locking component 32 can move smoothly radially outward along the output shaft 2, thereby allowing the tool head 200 to be smoothly inserted into the installation position. When the tool head 200 moves to the point where the recess 201 is opposite to the locking component 32, the locking component 32 will reset under the elastic restoring force of the elastic locking element 31 and partially embed into the recess 201, thereby locking the tool head 200.

[0063] In one implementation, such as Figure 2 and Figure 3As shown, the elastic locking element 31 is located in front of the first seal 51. In this solution, while achieving the goal of reducing the overall length of the power tool 100, the position of the elastic locking element 31 will not interfere with the arrangement of other components in the housing 1.

[0064] In yet another implementation, such as Figure 8 and Figure 9 As shown, the projections of the elastic locking element 31 and the bearing 4 on the first plane overlap at least partially. In this scheme, the elastic locking element 31 is completely located inside the housing 1. Thus, the reduction of the axial length of the output shaft 2 is not limited by the position of the elastic locking element 31, which is beneficial to shorten the axial length of the output shaft 2 as much as possible, so as to shorten the overall length of the power tool 100 as much as possible.

[0065] Furthermore, such as Figure 9 As shown, the inner ring of the bearing 4 is provided with a relief groove 41. The relief groove 41 is positioned radially opposite to the elastic locking element 31 on the output shaft 2. The relief groove 41 is used to form a deformable space for the elastic locking element 31 to deform outward. Specifically, during the process of installing and removing the tool head 200 from the mounting hole 21, the locking member 32 will move radially along the output shaft 2 in the radial through hole 22. When the locking member 32 moves outward, it will push the elastic locking element 31 outward. The relief groove 41 provided on the bearing 4 can provide a deformable space for the elastic locking element 31 to deform outward, so as to ensure that the locking member 32 can smoothly push the elastic locking element 31 open, so that the tool head 200 can be smoothly installed and removed from the mounting hole 21.

[0066] In one implementation, such as Figure 3 and Figure 7 As shown, the mounting hole 21 is a through-hole structure, including a first mounting hole 211 and a second mounting hole 212 distributed sequentially from front to back along the power tool 100. The first mounting hole 211 is used to mount the tool head 200. The power tool 100 also includes a sealing structure 6, which is detachably mounted in the second mounting hole 212. The sealing structure 6 is used to prevent lubricating oil in the housing 1 from entering the first mounting hole 211.

[0067] The above technical solution, by providing a mounting hole 21 on the output shaft 2, allows for easy removal of the tool head 200 if it cannot be pulled out due to breakage or other abnormalities. An auxiliary tool can be inserted from the rear end of the mounting hole 21 to push the tool head 200 out. This method is convenient, allows for individual replacement of the tool head 200, and saves replacement costs. Furthermore, configuring the mounting hole 21 as a first mounting hole 211 and a second mounting hole 212, with a sealing structure 6 in the second mounting hole 212, prevents lubricating oil from the housing 1 from entering the first mounting hole 211, thus preventing leakage and affecting user operation. When an auxiliary tool (such as a spare tool head) is needed to insert and remove the tool head 200 from the rear end of the mounting hole 21, the sealing structure 6 can be removed from the second mounting hole 212 for quick removal. This solution achieves the goal of quickly removing abnormal tool heads while avoiding lubricating oil leakage caused by the mounting hole 21 on the output shaft 2.

[0068] In one embodiment, the power tool 100 is a power tool equipped with a battery pack (not shown in the figure) to power the power tool 100. Of course, the power tool 100 can also be an AC power powered tool. The power tool 100 is equipped with a power cord (not shown in the figure) and is connected to the mains power through the power cord to achieve power supply.

[0069] Let's take power tool 100, specifically an electric drill, as an example. Figure 2 As shown, the power tool 100 also includes a motor 7, and a transmission assembly 8 includes a reduction mechanism 81, a spindle 82, and an impact mechanism 83. The reduction mechanism 81 includes a sun gear 811, planet gears 812, and an internal gear ring 813. The sun gear 811 is coaxially connected to the rotor shaft 71 of the motor 7, and the output end of the reduction mechanism 81 is connected to the spindle 82. The impact mechanism 83 includes a striking block 831, a ball 832, and a spring 833, and the impact mechanism 83 is driven by the spindle 82. When the motor 7 rotates, the reduction mechanism 81 reduces the speed output by the rotor shaft 71 and transmits it to the spindle 82. During the rotation of the spindle 82, the impact mechanism 83 is driven by the spindle 82, and the striking block 831 applies a rotational driving force to the output shaft 2 or periodically impacts the output shaft 2 in the rotational direction, so that the output shaft 2 rotates or undergoes rotational impact.

[0070] Of course, power tool 100 can also be other tools that can output power, including but not limited to electric hammers and electric screwdrivers. The transmission principle of the corresponding power tool can be referred to any existing power tool, which will not be elaborated here.

[0071] In one implementation, such as Figure 3 , Figure 7 and Figure 9As shown, the wall of the mounting hole 21 is also provided with a first protrusion 213. The first protrusion 213 is located between the first mounting hole 211 and the second mounting hole 212, and the sealing structure 6 partially abuts against the first protrusion 213. In this solution, the first protrusion 213 serves two purposes: firstly, it can limit the sealing structure 6 and prevent it from moving forward in the mounting hole 21; secondly, the contact area between the first protrusion 213 and the sealing structure 6 increases, meaning that both the peripheral and front surfaces of the sealing structure 6 can abut against the wall of the mounting hole 21, thereby improving the sealing effect of the sealing structure 6.

[0072] Furthermore, such as Figure 7 As shown, the first protrusion 213 is annular to increase the contact area between the first protrusion 213 and the sealing structure 6, thereby improving the sealing effect of the sealing structure 6.

[0073] In one implementation, such as Figures 8 to 10 As shown, the sealing structure 6 is a rubber element, and its outer peripheral wall is interference-fitted with the wall of the second mounting hole 212. The sealing structure 6 has a certain elastic deformation capability. The interference fit between the sealing structure 6 and the second mounting hole 212 ensures the sealing performance. Furthermore, during the removal of the sealing structure 6, it undergoes elastic deformation under pressure, allowing for easy removal of the sealing structure 6.

[0074] Furthermore, such as Figure 10 As shown, the outer contour of the cross-section of the sealing structure 6 is circular, and the outer periphery of the sealing structure 6 is provided with a plurality of annular protrusions 61; all the annular protrusions 61 are spaced apart along the axial direction of the sealing structure 6, and the outer periphery of the sealing structure 6 is configured as a concave-convex plane structure, which can improve the sealing performance between the sealing structure 6 and the second mounting hole 212.

[0075] In one implementation, such as Figures 8 to 10 As shown, the rear sidewall of the sealing structure 6 is provided with a groove 62 and a second protrusion 63. The second protrusion 63 is located in the groove 62 and is used for clamping tools to clamp, so that the clamping tools (such as tweezers) can remove the sealing structure 6, thereby quickly removing the sealing structure 6 and reducing the difficulty of removing the sealing structure 6.

[0076] Furthermore, such as Figure 10 As shown, the second protrusion 63 is annular to facilitate the clamping tool to clamp the second protrusion 63.

[0077] In one implementation, such as Figure 3 and Figure 7As shown, the spindle 82 includes a support end 821, which is at least partially inserted into the second mounting hole 212. The support end 821 is used to support the rear end of the output shaft 2. The support end 821 abuts against the sealing structure 6 to prevent the sealing structure 6 from moving backward, which helps the sealing structure 6 to be stably positioned in the corresponding mounting position. In addition, the sealing structure 6 can separate the spindle 82 from the tool head 200 inserted in the first mounting hole 211, preventing the spindle 82 from directly contacting the tool head 200 and avoiding wear of the spindle 82 as a result.

[0078] In one implementation, such as Figures 3 to 7 As shown, the output shaft 2 has two lugs 26 at its rear end, which are symmetrically arranged about the axis of the output shaft 2. The second mounting hole 212 is located at the rear end of the mounting hole 21. The maximum distance between the outer peripheral walls of the two lugs 26 is d1, and the diameter of the second mounting hole 212 is R1. The ratio of d1 to R1 is in the range of (3.5-4):1. Thus, by opening the mounting hole 21 on the output shaft 2, the structural strength of the output shaft 2 can be improved, and the service life of the output shaft 2 can be increased.

[0079] In one implementation, such as Figure 3 and Figure 7 As shown, the output shaft 2 also includes a shaft body 27, with a first mounting hole 211 penetrating the shaft body 27. That is, the shaft body 27 and the first mounting hole 211 are positioned opposite each other in the radial direction of the output shaft 2. The maximum diameter of the shaft body 27 is R2, and the maximum diameter of the first mounting hole 211 is R3. The ratio of R2 to R3 is in the range of (1.5-1.8):1, to ensure that the output shaft 2 has a certain structural strength.

[0080] Of course, the structure of the sealing structure 6 is not limited to the above scheme. This application will describe another specific embodiment in detail below.

[0081] In another embodiment, the power tool described in this embodiment is substantially the same as the power tool described in the above embodiments, except that the sealing structure 6 is different. For example... Figures 2 to 7As shown, the sealing structure 6 includes a rubber sealing ring 64 and a metal plug 65. The outer peripheral wall of the rubber sealing ring 64 is interference-fitted with the wall of the second mounting hole 212 to prevent lubricating oil in the housing 1 from entering the first mounting hole 211 from between the outer peripheral wall of the rubber sealing ring 64 and the second mounting hole 212. Furthermore, the outer peripheral wall of the metal plug 65 is clearance-fitted with the wall of the mounting hole 21. Thus, when the sealing structure 6 needs to be removed, the metal plug 65 can disengage from the mounting hole 21 under external force, and the rubber sealing ring 64 can elastically deform under compression to disengage from the mounting hole 21, allowing for easy removal of the sealing structure 6. The metal plug 65 blocks the annular hollow area of ​​the rubber sealing ring 64 along the axial direction of the output shaft 2 to prevent lubricating oil in the housing 1 from entering the annular hollow area of ​​the rubber sealing ring 64. This causes lubricating oil to leak into the first mounting hole 211. In other words, the seal between the rubber sealing ring 64 and the metal plug 65 is achieved by their tight contact along the axial direction of the output shaft 2. In this design, the rubber sealing ring 64 and the metal plug 65 work together to prevent the lubricating oil in the housing 1 from flowing into the first mounting hole 211. The metal plug 65 has high structural strength, which can improve the service life of the sealing structure 6.

[0082] Furthermore, such as Figures 2 to 6 As shown, the metal plug 65 includes a metal base plate 651 and a metal post 652 protruding from the metal base plate 651. A rubber sealing ring 64 is sleeved on the outer periphery of the metal post 652 with a clearance fit. Thus, when the sealing structure 6 needs to be removed, the metal plug 65 can be disengaged from the rubber sealing ring 64 under external force. The rubber sealing ring 64 abuts against the metal base plate 651 rearward with an interference fit. The tight abutment between the metal base plate 651 and the rubber sealing ring 64 in the axial direction of the output shaft 2 prevents lubricating oil from leaking between the metal plug 65 and the rubber sealing ring 64. In addition, the metal post 652 can prevent lubricating oil from leaking between the metal plug 65 and the rubber sealing ring 64 to a certain extent, thus ensuring the sealing effect of the sealing structure 6.

[0083] Furthermore, such as Figures 2 to 7As shown, the rubber sealing ring 64 at least partially abuts against the first protrusion 213 of the mounting hole 21, and the rubber sealing ring 64 and the first protrusion 213 are interference-fitted. The first protrusion 213 limits the rubber sealing ring 64, preventing the sealing structure 6 from moving forward in the mounting hole 21. Furthermore, the abutment between the first protrusion 213 and the rubber sealing ring 64 increases the contact area between the mounting hole 21 and the rubber sealing ring 64, thereby improving the sealing effect of the sealing structure 6. Furthermore, the outer end 6521 of the metal column partially extends into the annular hollow area of ​​the first protrusion 213, which can block the annular hollow area of ​​the first protrusion 213 to a certain extent, further improving the sealing effect of the sealing structure 6. It should be understood that since the outer peripheral wall of the metal plug 65 is clearance-fitted with the wall of the mounting hole 21, the outer peripheral wall of the metal column 6521 is clearance-fitted with the first protrusion 213, so that the user can remove the metal plug 65.

[0084] In one implementation, such as Figure 6 As shown, one of the front sidewall of the metal substrate 651 and the rear sidewall of the rubber sealing ring 64 is provided with an insertion protrusion 641, and the other is provided with a slot 6511. The insertion protrusion 641 and the slot 6511 are inserted into each other with a clearance fit. In this design, the metal substrate 651 and the rubber sealing ring 64 are connected by the insertion protrusion 641 and the slot 6511, which can further prevent lubricant in the housing 1 from leaking from between the metal substrate 651 and the rubber sealing ring 64 to the first mounting hole 211. Furthermore, the clearance fit between the insertion protrusion 641 and the slot 6511 ensures that the insertion of the insertion protrusion 641 and the slot 6511 will not prevent the metal plug 65 from being removed from the second mounting hole 212. In a specific embodiment, the insertion protrusion 641 is provided on the rear sidewall of the rubber sealing ring 64, and the slot 6511 is provided on the front sidewall of the metal substrate 651.

[0085] 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 in that, The power tool includes: chassis; An output shaft, the first end of which is inserted into the housing; the output shaft is provided with an interconnected mounting hole and a radial through hole; the mounting hole extends along the axis of the output shaft and is used to mount a tool head; A quick-release assembly includes an elastic locking element and a locking component, the locking component being movably inserted into the radial through hole, the elastic locking element pressing against the locking component in a direction toward the axis of the output shaft; When the tool head is installed into the mounting hole, the locking component locks the tool head under the pressure of the elastic locking element; The first plane is defined as a plane parallel to the axis of the output shaft, and the projections of the elastic locking element and the housing on the first plane at least partially overlap.

2. The power tool according to claim 1, characterized in that, The outer peripheral wall of the output shaft is also provided with an annular groove, which communicates with the radial through hole; the elastic locking element is annular and is engaged in the annular groove.

3. The power tool according to claim 1, characterized in that, The power tool also includes a bearing, and the output shaft is rotatably connected to the housing via the bearing; a first seal is provided between the inner wall of the front end of the housing and the front end face of the bearing, and the first seal is used to seal the gap between the front end of the housing and the outer peripheral wall of the output shaft.

4. The power tool according to claim 3, characterized in that, The elastic locking element is located in front of the first seal.

5. The power tool according to claim 3, characterized in that, The projections of the elastic locking element and the bearing on the first plane at least partially overlap.

6. The power tool according to claim 5, characterized in that, The bearing has a relief groove on its inner ring. The relief groove is opposite to the elastic locking element in the radial direction of the output shaft. The relief groove is used to form a deformable space for the elastic locking element to deform outward.

7. The power tool according to claim 3, characterized in that, A second seal is provided between the outer ring of the bearing and the inner wall of the housing.

8. The power tool according to any one of claims 1-7, characterized in that, The second end of the output shaft is located outside the housing, and the distance between the end face of the second end and the front end face of the housing is less than or equal to 20mm.

9. The power tool according to any one of claims 1-7, characterized in that, The elastic locking element includes a rubber ring, a steel ring, or a coil spring.

10. The power tool according to any one of claims 1-7, characterized in that, The locking component includes at least one steel ball or at least one ball-head pin.

11. The power tool according to any one of claims 1-7, characterized in that, The mounting hole is a through hole structure, which includes a first mounting hole and a second mounting hole distributed sequentially from front to back along the power tool. The first mounting hole is used to mount the tool head. The power tool also includes a sealing structure that is detachably mounted in the second mounting hole, the sealing structure being used to prevent lubricating oil in the housing from entering the first mounting hole.

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