Electric tool

Abstract

The utility model relates to an electric tool which comprises a gear box used for containing a speed reducing mechanism, and the gear box comprises a box body which comprises a first connecting structure and is provided with two open ends; the end cover comprises a second connecting structure, a cover body section and a flange section, and the end cover is located at the rear part of the box body; the sealing ring is connected to the periphery of the cover body section in a sleeving manner; the second connecting structure at least partially protrudes out of the cover body section so as to prevent the sealing ring from being separated from the cover body section in the direction away from the flange section. The first connecting structure and the second connecting structure are detachably connected, the flange section enables the sealing ring to abut against the limiting end face of the box body, and therefore the sealing ring seals an assembly gap between the box body and the end cover. According to the electric tool, the assembling structure of the box body and the rear cover of the gear box is improved, and the assembling difficulty of the gear box can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field, in particular to a kind of electric tools. BACKGROUND

[0002] Electric tool adopts planetary gear train as reduction mechanism, the high-speed rotation generated by motor is reduced, to output greater torque.Electric tool is assembled reduction mechanism by gear box, gear box includes box and back cover, in order to reduce the wear of reduction mechanism, need to smear lubricating oil on the surface of planetary gear train in the process of assembly, and fill lubricating oil in gear box, to prevent gear box from leaking, sealing ring will be configured, to seal the assembly gap of box and back cover.

[0003] In the process of assembling electric tool, sealing ring is first sleeved on the circumferential surface wall of back cover, then box and back cover are inserted in the axial direction of gear box by extension rib and limiting slot, extension rib and limiting slot cooperate, can prevent relative rotation between box and back cover, but cannot prevent the back movement of box and back cover in the axial direction of gear box, which is in the process that operator assembles the assembly of box and back cover to the shell of electric tool, box and back cover are prone to displacement and separation, increase assembly difficulty.In addition, in order to ensure sealing, the cooperation between sealing ring and circumferential surface wall of back cover has a certain amount of interference, which can cause sealing ring to rebound and separate from back cover, increasing assembly difficulty. SUMMARY

[0004] Based on the above defects in the prior art, the purpose of the utility model is to provide an electric tool, the assembly structure of the box and back cover of gear box is improved, to reduce the assembly difficulty of gear box.

[0005] Therefore, the utility model provides the following technical scheme.

[0006] The utility model provides a kind of electric tool, the electric tool includes gear box to accommodate reduction mechanism, the gear box includes:

[0007] Box, it includes first connecting structure and its both ends are open;

[0008] End cover, it includes second connecting structure, cover body section and flange section, the end cover is located in the rear of the box;

[0009] Sealing ring, it is sleeved in the outer periphery of the cover body section;

[0010] Wherein, the second connecting structure at least partially protrudes from the cover body section, to prevent the sealing ring from separating from the cover body section in the direction away from the flange section;

[0011] The first connecting structure is detachably connected to the second connecting structure, and the flange section presses the sealing ring against the limiting end face of the housing, thereby filling the assembly gap between the housing and the end cover.

[0012] Optionally, the first connecting structure is a groove formed on the inner wall of the box, and the second connecting structure is a snap-fit ​​structure; the cover section extends at least partially into the box, and the first connecting structure and the second connecting structure are fastened together.

[0013] Optionally, the first connecting structure is ring-shaped, and the number of the second connecting structures is at least two, with all the second connecting structures arranged in a circular array.

[0014] Optionally, the second connecting structure is disposed on the cover section, the cover section has a notch, and the second connecting structure is located in the notch.

[0015] Optionally, the second connection structure includes a connecting arm and a snap-fit ​​protrusion;

[0016] When the sealing ring is fitted onto the outer periphery of the cover section, the outer sidewall of the connecting arm is interference-fitted with the inner sidewall of the sealing ring, and the snap-fit ​​protrusion is used to prevent the sealing ring from detaching from the cover section.

[0017] Optionally, the end cap is provided with a first foolproof structure, and the housing is provided with a second foolproof structure; the first foolproof structure and the second foolproof structure cooperate to indicate the installation position of the end cap relative to the housing.

[0018] Optionally, the first foolproof structure is a positioning rib, and the second foolproof structure is a positioning groove.

[0019] Optionally, the rear end face of the housing constitutes the limiting end face.

[0020] Optionally, the power tool further includes a reduction mechanism and a first bearing. The reduction mechanism includes a planetary carrier, and the end cover is provided with a first mounting groove. The first bearing is installed in the first mounting groove to support the planetary carrier.

[0021] Optionally, the power tool further includes a motor and a second bearing. The motor includes a drive shaft, and the end cover is provided with a second mounting groove. The second bearing is mounted in the second mounting groove to support the front part of the drive shaft.

[0022] This utility model has the following technical effects:

[0023] This utility model provides an electric tool that, through improvements to the first and second connecting structures, can stably connect the end cover and the housing, thereby ensuring that the end cover and the housing will not shift relative to each other during the assembly of the gearbox and the housing. Furthermore, when the first and second connecting structures are connected, the flange section can press the sealing ring against the limiting end face of the housing, preventing the sealing ring from being damaged during assembly. In addition, the second connecting structure protrudes at least partially from the cover section, preventing the sealing ring from detaching from the cover section during assembly, facilitating operation and reducing assembly difficulty. Attached Figure Description

[0024] Figure 1 This is a partial three-dimensional structural diagram of the power tool of this utility model;

[0025] Figure 2 This is a cross-sectional view of the power tool according to the present invention;

[0026] Figure 3 This is a cross-sectional view of the gearbox structure of this utility model;

[0027] Figure 4 This is an exploded view of the gearbox structure of this utility model;

[0028] Figure 5 This is a three-dimensional structural diagram of the end cap of this utility model.

[0029] Explanation of reference numerals in the attached figures

[0030] 100. Power tools;

[0031] 1. Gearbox;

[0032] 11. Housing; 111. First connecting structure; 112. Limiting end face; 113. Second foolproof structure;

[0033] 12. End cap; 121. Second connecting structure; 1211. Connecting arm; 1212. Snap-fit ​​protrusion; 122. Cover body section; 1221. Notch; 123. Flange section; 124. First foolproof structure; 125. First mounting groove; 126. Second mounting groove;

[0034] 13. Sealing ring;

[0035] 2. Reduction gear; 21. Planet carrier; 22. Planet gears; 23. Sun gear; 24. Internal gear ring;

[0036] 3. First bearing;

[0037] 4. Spindle;

[0038] 5. Motor; 51. Drive shaft;

[0039] 6. Second bearing;

[0040] 7. Impact mechanism; 71. Impact block; 72. Spring; 73. Ball bearing;

[0041] 8. Output shaft;

[0042] 9. Housing. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In this utility model, "front" and "rear" refer to... Figures 1 to 3 The markings in the text shall prevail.

[0049] The following is based on Figures 1 to 5 This utility model describes the power tool in detail.

[0050] In this embodiment, such as Figure 1 and Figure 2 As shown, the power tool 100 includes a gearbox 1, a reduction mechanism 2, a spindle 4, a motor 5, an impact mechanism 7, and an output shaft 8. The reduction mechanism 2 is located in the gearbox 1. The impact mechanism 7 includes an impact block 71, a spring 72, and a ball bearing 73. The impact block 71 is sleeved on the outer periphery of the spindle 4. The inner wall of the impact block 71 has a first guide groove (not shown in the figure), and the outer wall of the spindle 4 has a second guide groove (not shown in the figure). The first guide groove and the second guide groove together form a guide ball track, in which the ball bearing 73 is movably located. The drive shaft 51 of the motor 5, the reduction mechanism 2, and the spindle 4 are sequentially connected and driven. The drive shaft 51 drives the spindle 4 to rotate through the reduction mechanism 2. The spindle 4 drives the impact block 71 to move through the ball bearing 73. The impact block 71 drives the output shaft 8 to move the tool head.

[0051] like Figures 1 to 5As shown, the gearbox 1 includes a housing 11, an end cover 12, and a sealing ring 13. The housing 11 has open ends; one end allows the main shaft 4 to pass through for transmission engagement with the reduction mechanism 2, and the other end communicates with the end cover 12. The housing 11 includes a first connecting structure 111, and the end cover 12 includes a second connecting structure 121, a cover section 122, and a flange section 123. The end cover 12 is located at the rear of the housing 11, and the sealing ring 13 is fitted around the outer periphery of the cover section 122. The first connecting structure 111 and the second connecting structure 121 are detachably connected, allowing the housing 11 and the end cover 12 to connect and together form a cavity for accommodating the reduction mechanism 2. Furthermore, when the first connecting structure 111 and the second connecting structure 121 are in a connected state, the flange section 123 can press the sealing ring 13 against the limiting end face 112 of the housing 11. Due to the compression, the sealing ring 13 can seal the assembly gap between the housing 11 and the end cover 12.

[0052] Furthermore, when assembling the gearbox 1, the sealing ring 13 is first fitted onto the outer periphery of the cover section 122 of the end cover 12, and then the end cover 12 is connected to the housing 11. When the end cover 12 is not connected to the housing 11, since the flange section 123 protrudes from the cover section 122, the sealing ring 13 cannot pass over the flange section 123 and detach from the cover section 122. At the same time, since the second connecting structure 121 at least partially protrudes from the cover section 122, the sealing ring 13 cannot move in a direction away from the flange section 123 to the part that protrudes from the cover section 122 beyond the second connecting structure 121, thereby preventing the sealing ring 13 from detaching from the cover section 122.

[0053] By adopting the above technical solution, the first connecting structure 111 and the second connecting structure 121 are improved. On the one hand, the first connecting structure 111 and the second connecting structure 121 cooperate to stably connect the end cover 12 and the housing 11. In this way, when the end cover 12 and the housing 11 are assembled and then mounted on the housing 9 of the power tool 100, the end cover 12 and the housing 11 will not shift relative to each other, which is convenient for operation. On the other hand, when the first connecting structure 111 and the second connecting structure 121 are in the connected state, the flange section 123 can press the sealing ring 13 against the limiting end face 112 of the housing 11, which can prevent the sealing ring 13 from being damaged during assembly. Furthermore, by limiting the second connecting structure 121 to at least partially protrude from the cover section 122, the sealing ring 13 is prevented from detaching from the cover section 122 during the assembly process, which is convenient for operation and reduces the difficulty of assembly.

[0054] In one implementation, such as Figure 3 and Figure 4 As shown, the rear end face of the housing 11 forms a limiting end face 112, eliminating the need for an additional limiting end face and reducing processing costs.

[0055] In one implementation, such asFigures 3 to 5 As shown, the first connecting structure 111 is a slot formed on the inner wall of the box 11, and the second connecting structure 121 is a snap-fit ​​structure; the cover section 122 extends into the box 11 at least partially, and the first connecting structure 111 and the second connecting structure 121 are snapped together, making the assembly structure simple and easy to operate.

[0056] Furthermore, such as Figure 4 As shown, the first connecting structure 111 is annular, that is, the first connecting structure 111 is an annular groove. Compared with setting a groove on the inner wall of the housing 11 that matches the size of the second connecting structure 121, this solution reduces the processing difficulty of slotting on the housing 11. Figure 5 As shown, there are at least two second connection structures 121 to ensure stable connection. Furthermore, all the second connection structures 121 are arranged in a circular array, which is beneficial for the buckle to receive force evenly and avoids excessive stress at local connection points, which could lead to damage.

[0057] In one implementation, such as Figure 5 As shown, the second connecting structure 121 is provided on the cover body section 122. The cover body section 122 has a notch 1221, and the second connecting structure 121 is located in the notch 1221. In this way, during the process of connecting or disconnecting the first connecting structure 111 and the second connecting structure 121, the second connecting structure 121 can easily deform, thereby achieving quick fastening or disconnection.

[0058] Furthermore, such as Figures 3 to 5 As shown, the second connecting structure 121 includes a connecting arm 1211 and a snap-fit ​​protrusion 1212. When the sealing ring 13 is fitted onto the outer periphery of the cover section 122, the outer sidewall of the connecting arm 1211 and the inner sidewall of the sealing ring 13 are interference-fitted, which helps the sealing ring 13 to be stably fitted onto the outer periphery of the cover section 122. The snap-fit ​​protrusion 1212 protrudes radially outward along the sealing ring 13, thereby preventing the sealing ring 13 from moving away from the flange section 123 and detaching from the cover section 122.

[0059] In one implementation, such as Figure 1 , Figure 4 and Figure 5 As shown, the end cap 12 is provided with a first anti-foolproof structure 124, and the housing 11 is provided with a second anti-foolproof structure 113; the first anti-foolproof structure 124 and the second anti-foolproof structure 113 cooperate to indicate the installation position of the end cap 12 relative to the housing 11, which facilitates operation.

[0060] Furthermore, the first foolproof structure 124 is a positioning rib, and the second foolproof structure 113 is a positioning groove, making the foolproof structure simple.

[0061] In one implementation, such as Figure 2As shown, the power tool 100 also includes a first bearing 3, and the reduction mechanism 2 includes a planetary carrier 21, planetary gears 22, a sun gear 23, and an internal gear ring 24. The planetary gears 22 are mounted on the planetary carrier 21 and mesh with the sun gear 23 and the internal gear ring 24 respectively. The sun gear 23 is coaxially connected to the drive shaft 51 of the motor 5. Figure 2 , Figure 3 and Figure 5 As shown, the end cap 12 is provided with a first mounting groove 125, and the first bearing 3 is installed in the first mounting groove 125. The first bearing 3 is sleeved on the outer periphery of the planetary carrier 21 and the two are interference-fitted. The first bearing 3 is used to support the planetary carrier 21. Furthermore, the planetary carrier 21 is integrally formed on the rear end of the spindle 4, reducing the number of parts and simplifying the assembly process.

[0062] In one implementation, such as Figures 2 to 4 As shown, the power tool 100 also includes a second bearing 6, and the end cover 12 is provided with a second mounting groove 126; the second bearing 6 is mounted in the second mounting groove 126, and the second bearing 6 is sleeved on the front part of the drive shaft 51 with an interference fit between the two, and the second bearing 6 is used to support the front part of the drive shaft 51.

[0063] 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 (100) includes a gearbox (1) for housing a reduction gear, the gearbox (1) comprising: The housing (11) includes a first connecting structure (111) and has open ends; End cap (12), which includes a second connecting structure (121), a cover section (122) and a flange section (123), the end cap (12) being located at the rear of the housing (11); A sealing ring (13) is fitted around the outer periphery of the cover body section (122); The second connecting structure (121) protrudes at least partially from the cover section (122) to prevent the sealing ring (13) from disengaging from the cover section (122) in a direction away from the flange section (123); The first connecting structure (111) is detachably connected to the second connecting structure (121), and the flange section (123) presses the sealing ring (13) against the limiting end face (112) of the housing (11), thereby filling the assembly gap between the housing (11) and the end cover (12).

2. The power tool according to claim 1, characterized in that, The first connecting structure (111) is a slot formed on the inner wall of the box (11), and the second connecting structure (121) is a snap-fit ​​structure; the cover section (122) extends at least partially into the box (11), and the first connecting structure (111) and the second connecting structure (121) are fastened together.

3. The power tool according to claim 2, characterized in that, The first connecting structure (111) is ring-shaped, and the number of the second connecting structures (121) is at least two, with all the second connecting structures (121) arranged in a circular array.

4. The power tool according to claim 2, characterized in that, The second connecting structure (121) is disposed on the cover section (122), the cover section (122) is provided with a notch (1221), and the second connecting structure (121) is located in the notch (1221).

5. The power tool according to claim 4, characterized in that, The second connection structure (121) includes a connecting arm (1211) and a fastening protrusion (1212); When the sealing ring (13) is fitted onto the outer periphery of the cover section (122), the outer sidewall of the connecting arm (1211) is press-fitted with the inner sidewall of the sealing ring (13), and the snap-fit ​​protrusion (1212) is used to prevent the sealing ring (13) from disengaging from the cover section (122).

6. The power tool according to claim 2, characterized in that, The end cap (12) is provided with a first anti-foolproof structure (124), and the housing (11) is provided with a second anti-foolproof structure (113); the first anti-foolproof structure (124) and the second anti-foolproof structure (113) cooperate to indicate the installation position of the end cap (12) relative to the housing (11).

7. The power tool according to claim 6, characterized in that, The first anti-foolproof structure (124) is a positioning rib, and the second anti-foolproof structure (113) is a positioning groove.

8. The power tool according to any one of claims 1-7, characterized in that, The rear end face of the housing (11) constitutes the limiting end face (112).

9. The power tool according to any one of claims 1-7, characterized in that, The power tool (100) further includes a reduction mechanism (2) and a first bearing (3). The reduction mechanism (2) includes a planetary carrier (21), and the end cap (12) is provided with a first mounting groove (125). The first bearing (3) is installed in the first mounting groove (125) to support the planetary carrier (21).

10. The power tool according to any one of claims 1-7, characterized in that, The power tool (100) also includes a motor (5) and a second bearing (6). The motor (5) includes a drive shaft (51), and the end cover (12) is provided with a second mounting groove (126). The second bearing (6) is mounted in the second mounting groove (126) to support the front of the drive shaft (51).

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