Oil leakage prevention device for reduction gearbox of electric tool

Abstract

The utility model discloses a reduction gearbox oil leakage prevention device of an electric tool, which comprises a shell, a speed regulation assembly and a gear box arranged in the shell, the speed regulation assembly comprises a movable speed regulation steel wire, the speed regulation steel wire extends into the gear box and regulates the speed through movement, the gear box is provided with a movable hole for the speed regulation steel wire to extend into and regulate the speed, and the movable hole is communicated with the shell. A blocking piece corresponding to the movable hole is arranged between the gearbox and the shell, the blocking piece has elasticity, the blocking piece presses and covers the movable hole to block the movable hole, and flowing-out of lubricating oil in the gearbox is reduced through blocking of the blocking piece.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an oil leakage prevention device for a reduction box of an electric tool. Background Art

[0002] Existing gun drill power tools usually include impact wrenches, electric drills, electric screwdrivers and impact drills. The power tool structure generally includes a housing, a motor located in the housing, a gear box driven by the motor, and an output head connected to the gear box. The motor finally transmits power to the output head through the transmission of the gear box. Existing power tools generally can only provide one speed and one torque output.

[0003] In order to solve the above problems, adjustable speed electric tools have appeared on the market, such as the speed-adjustable ratchet wrench disclosed in Chinese utility model patent CN219404088U, which includes a housing, a motor located in the housing, a transmission mechanism driven by the motor and a driving mechanism connected to the transmission mechanism. The housing includes a base, and the transmission mechanism is a planetary gear reducer. The transmission mechanism includes a first planetary mechanism and a second planetary mechanism located in the base and an inner gear ring sleeved on the outer periphery of the first planetary mechanism and / or the second planetary mechanism, and also includes a shift dial slidably arranged on the outer side of the base, a shift wire is connected below the shift dial, the shift wire is spanned and fixed on the outer periphery of the inner gear ring, and the shift dial drives the inner gear ring to move in the axial direction through the shift wire, so that the inner gear ring is selectively engaged with the first planetary mechanism or the second planetary mechanism to achieve speed regulation, and a movable hole for the shift wire to pass through and to be linked with the inner gear ring is opened on the base.

[0004] In order to realize the speed regulation function of the shift wire, the existing electric tools have movable holes on the outer walls of both sides of the reduction box for the ends of the shift wire to be inserted into the reduction box and linked with the inner gear ring. The shift knob is sliding to make the shift wire drive the inner gear ring to move for speed regulation. The movable hole has space for the shift wire to move when the shift knob is slid. Due to the movable hole on the reduction box, a large amount of lubricating oil in the reduction box will leak out from the movable hole, thereby affecting the operation of the gears in the reduction box. Utility Model Content

[0005] The utility model aims to provide an anti-leakage device for the reduction box of an electric tool to solve the problem that a movable hole is opened on the reduction box in order to realize the speed regulation function of the shift wire in the existing electric tool, so that a large amount of lubricating oil in the reduction box leaks out from the movable hole.

[0006] The technical solution adopted by the utility model to solve the above-mentioned structural problem is: an anti-oil leakage device for a reduction gearbox of an electric tool comprises a housing, a speed regulating component, and a gear box arranged in the housing, the speed regulating component comprises a movable speed regulating wire, the speed regulating wire extends into the gear box and adjusts the speed by movement, the gear box is provided with a movable hole for the speed regulating wire to extend into the speed regulation, a sealing member corresponding to the movable hole is provided between the gear box and the housing, the sealing member is elastic, and the sealing member is pressed onto the movable hole to seal the movable hole.

[0007] A further preferred technical solution of the utility model is that the area of ​​the blocking member used to block the movable hole is not less than the opening area of ​​the movable hole.

[0008] A further preferred technical solution of the utility model is: the blocking piece is fixed to the shell, an embedding groove is provided on the inner wall of the shell, the blocking piece is inserted into the embedding groove, and a part of the blocking piece protrudes from the embedding groove for blocking the movable hole.

[0009] A further preferred technical solution of the utility model is: the blocking piece is fixed to the outer shell, and the blocking piece is glued and fixed to the inner wall of the outer shell.

[0010] A further preferred technical solution of the utility model is: the blocking member is fixed by the clamping force between the inner wall of the shell and the outer wall of the gear box.

[0011] A further preferred technical solution of the utility model is: a gap for accommodating a blocking member is provided between the housing and the gear box, and a thickness of the blocking member in a natural state is not less than a width of the gap.

[0012] A further preferred technical solution of the utility model is: the speed regulating wire is located between the gear box and the housing, and the speed regulating wire is straddled on the outside of the gear box, and movable holes are provided on both sides of the gear box for the ends of the speed regulating wire to extend into the speed regulation, and the ends of the speed regulating wire on both sides have linkage parts extending toward the middle, and the linkage parts on both sides respectively pass through the movable holes on both sides and extend into the gear box, so as to cooperate with the transmission gear inside the gear box.

[0013] A further preferred technical solution of the utility model is that the blocking member is pressed onto the outer side of the speed regulating wire at the same time.

[0014] A further preferred technical solution of the utility model is: the speed regulation assembly includes a speed regulation dial button slidably arranged on the outer shell, the movement of the speed regulation wire is driven by the sliding of the speed regulation dial button, the speed regulation wire includes side edges located on both sides of the gear box, one side of the two side edges is connected by a top edge, and a linkage part extending into the gear box is arranged on the other side of the two side edges, the middle parts of the two side edges are hinged to the gear box, the top edge is movably connected to the speed regulation dial button, and when the speed regulation dial button slides relative to the outer shell, the top edge is moved to make the linkage part located on the other side of the side edge swing for speed regulation.

[0015] A further preferred technical solution of the utility model is that the blocking member is elastic silica gel or elastic rubber.

[0016] Compared with the prior art, the utility model has the advantages of comprising a housing and a gear box arranged in the housing, the gear box being provided with a movable hole for the speed regulating wire to extend into and move in conjunction with, a sealing member corresponding to the movable hole being provided between the gear box and the housing, the sealing member being pressed onto the movable hole to seal the movable hole, and the outflow of lubricating oil inside the gear box being reduced by the sealing of the sealing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 It is a schematic diagram of the overall structure of the electric screwdriver;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of an electric screwdriver;

[0020] Figure 3 This is a schematic diagram of the internal structure of an electric screwdriver;

[0021] Figure 4 It is a schematic diagram of the separation of the plugging piece and the movable hole;

[0022] Figure 5 is a cross-sectional schematic diagram of an electric screwdriver;

[0023] Figure 6 It is a schematic diagram of the structure of the left half shell.

[0024] In the figure: 1. speed control knob; 2. shell; 3. toggle part; 4. window; 5. snap-in block; 6. snap-in groove; 7. speed control wire; 8. top edge; 9. side edge; 10. linkage part; 11. gear box; 12. hinge shaft; 13. snap-in convex block; 14. movable hole; 15. left half shell; 16. right half shell; 17. blocking piece; 18. slide groove; 19. inner gear ring; 20. embedded groove. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0027] The reduction gearbox oil leakage prevention device is configured to block the movable hole 14 on the gear box 11 by setting a sealing member 17 between the housing 2 and the gear box 11, so as to reduce the problem of oil leakage of the gear box 11. The device can be applied to electric tools that can adjust the speed by adjusting the speed of the speed regulating wire 7, such as impact wrenches, electric drills, electric screwdrivers and impact drills. The accompanying drawings of this embodiment illustrate the above-mentioned oil leakage prevention device through an electric screwdriver.

[0028] Figure 1-Figure 6 As shown, the reduction gearbox anti-leakage device includes a housing 2, a speed regulating assembly, and a gearbox 11 arranged in the housing 2. The gearbox 11 is used to install a transmission gear that receives the rotational power of the motor and transmits it to the output shaft. The transmission gear is, for example, a planetary gear reducer. The planetary gear reducer includes an inner ring gear 19, a planet carrier, and planetary gears mounted on the planet carrier and meshing with the inner ring gear 19.

[0029] The speed regulating assembly comprises a movable speed regulating wire 7, which extends into a gear box 11 and is moved to adjust the speed. The gear box 11 is provided with a movable hole 14 for the speed regulating wire 7 to extend into for speed regulation.

[0030] Preferably, the speed regulating assembly further comprises a speed regulating dial button 1 slidably disposed on the housing 2 , and the movement of the speed regulating wire 7 is driven by the sliding of the speed regulating dial button 1 .

[0031] Figure 3 , Figure 4 As shown, preferably, a slide groove 18 is provided on the housing 2, and the speed dial button 1 is slidably set in the slide groove 18. A window 4 is provided on the housing 2, and a toggle portion 3 is provided on the speed dial button 1, extending from the window 4, for manual toggle.

[0032] Figure 2 As shown, preferably, the outer shell 2 includes a left half shell 15 and a right half shell 16, which are fixedly connected by screws after being matched together. A left groove is provided on the left half shell 15, and a right groove is provided on the right half shell 16. After the left half shell 15 and the right half shell 16 are matched together, the left groove and the right groove are combined into the above-mentioned slide groove 18.

[0033] Figure 5As shown, preferably, the speed regulating wire 7 is installed between the speed regulating dial 1 and the outer side of the gear box 11, the speed regulating wire 7 is straddled on the outer side of the gear box 11, and the two sides of the gear box 11 are provided with movable holes 14 for the two side ends of the speed regulating wire 7 to extend into the speed regulation, and the two side ends of the speed regulating wire 7 have linkage parts 10 extending toward the middle, and the linkage parts 10 on both sides respectively pass through the movable holes 14 on both sides of the gear box 11 and extend into the gear box 11, and are used to cooperate with the transmission gears inside the gear box 11. For example, the linkage parts 10 on both sides extend into the gear box 11 and are connected to the inner gear ring 19, and the speed regulating wire 7 is driven to move by pushing the speed regulating dial 1 to slide, so that the speed regulating wire 7 drives the inner gear ring 19 to move axially to achieve speed regulation.

[0034] Preferably, the speed regulating wire 7 includes side edges 9 located on both sides of the gear box 11, one side of the side edges 9 is connected by the top edge 8, the linkage part 10 extending into the gear box 11 is arranged on the other side of the side edges 9, the middle part of the side edges 9 is hinged to the gear box 11, the top edge 8 is movably connected to the speed regulating dial 1, and the speed regulating dial 1 slides relative to the housing 2 to toggle the top edge 8, so that the linkage part 10 located on the other side of the side edge 9 swings to toggle the inner gear ring 19 inside the gear box 11 to move for speed regulation. The speed regulating dial 1 is arranged on the top of the housing 2, the speed regulating wire 7 is inserted downwardly on the outside of the gear box 11, and the top edge 8 is located above the gear box 11.

[0035] Preferably, a snap-in block 5 is protruded on the inner side wall of the speed dial 1 , and a snap-in groove 6 is provided on the snap-in block 5 for the top edge 8 to be inserted into. The top edge 8 is movably inserted into the snap-in groove 6 and is moved by sliding the speed dial 1 .

[0036] When the speed regulating wire 7 rotates, the linkage part 10 located at the lower part of the side edge 9 rotates in the movable hole 14 around the hinge point.

[0037] Preferably, hinge shafts 12 are protrudingly provided on the outer walls of both sides of the gear box 11 , and the middle parts of the two side edges 9 of the speed regulating wire 7 are respectively hinged on the hinge shafts 12 on both sides and rotate around the hinge shafts 12 .

[0038] Preferably, the speed regulating wire 7 is C-shaped or U-shaped.

[0039] Figure 3 As shown, a positioning protrusion 13 is provided above the movable hole 14 on the gear box 11. When the speed dial 1 is pushed forward or backward to change gears, the lower part of the side 9 of the speed regulating wire 7 is placed on the front or rear side of the positioning protrusion 13. The positioning protrusion 13 limits the speed regulating wire 7, so that the speed regulating wire 7 is locked at the position corresponding to the required gear position, preventing the speed of the electric screwdriver from changing due to the displacement of the speed regulating wire 7 during operation. When the speed dial 1 slides, the lower part of the side 9 of the speed regulating wire 7 is squeezed by the positioning protrusion 13 to cause elastic deformation, so that the lower part of the side 9 can be lifted up and pass over the positioning protrusion 13.

[0040] Figure 2-Figure 5 As shown, a sealing member 17 corresponding to the movable hole 14 is provided between the gear box 11 and the housing 2 . The sealing member 17 is elastic and is pressed onto the movable hole 14 to seal the movable hole 14 . The sealing of the sealing member 17 reduces the outflow of lubricating oil inside the gear box 11 .

[0041] Preferably, the blocking piece 17 is pressed onto the outside of the speed regulating wire 7 while blocking the movable hole 14. When the speed regulating wire 7 swings around the hinge shaft 12 for gear shifting and speed regulation, the blocking piece 17 is elastically deformed by the squeezing of the speed regulating wire 7, so that the speed regulating wire 7 can move under the blocking piece 17.

[0042] Preferably, the blocking member 17 is made of elastic silicone or elastic rubber.

[0043] Preferably, the area of ​​the blocking member 17 used to block the movable hole 14 is not less than the orifice area of ​​the movable hole 14. Most preferably, the area of ​​the blocking member 17 used to block the movable hole 14 is slightly larger than the orifice area of ​​the movable hole 14, so that the blocking member 17 can block the outside of the entire orifice of the movable hole 14.

[0044] In order to ensure the blocking effect of the blocking member 17 and prevent the blocking member 17 from moving when in use, the blocking member 17 needs to be positioned. There are many ways to position the blocking member 17 between the gear box 11 and the housing 2, for example:

[0045] Figure 6 As shown, a solution is shown, the blocking member 17 is fixed to the housing 2, and a groove 20 is provided on the inner wall of the housing 2. The blocking member 17 is inserted into the groove 20, and a part of the blocking member 17 protrudes from the groove 20 to block the movable hole 14. In order to make the blocking member 17 more effective, the thickness of the part of the blocking member 17 protruding from the groove 20 in the natural state is greater than the distance from the movable hole 14 to the notch of the groove 20, so that when the blocking member 17 is pressed on the movable hole 14 for blocking, it will be elastically deformed due to extrusion, and the elastic reset of the blocking member 17 allows the blocking member 17 to be tightly attached to the movable hole 14.

[0046] In another solution, the plugging member 17 is fixed to the housing 2, and the plugging member 17 is glued and fixed to the inner wall of the housing 2. There is a gap between the housing 2 and the gear box 11 for accommodating the plugging member 17. In order to make the plugging member 17 more effective, the thickness of the plugging member 17 in the natural state is not less than the width of the gap. Preferably, the thickness of the plugging member 17 in the natural state is greater than the width of the gap, so that when the plugging member 17 is pressed on the movable hole 14 for blocking, it will be elastically deformed due to extrusion, and the elastic reset of the plugging member 17 allows the plugging member 17 to be tightly attached to the movable hole 14.

[0047] In another solution, the blocking member 17 is fixed by the clamping force between the inner wall of the housing 2 and the outer wall of the gear box 11. There is a gap between the housing 2 and the gear box 11 for accommodating the blocking member 17. In order to make the blocking member 17 more effective, the thickness of the blocking member 17 in the natural state is not less than the width of the gap. Preferably, the thickness of the blocking member 17 in the natural state is greater than the width of the gap, so that when the blocking member 17 is pressed on the movable hole 14 for blocking, it will be elastically deformed due to extrusion, and the elastic reset of the blocking member 17 allows the blocking member 17 to be tightly attached to the movable hole 14.

[0048] Regarding the above-mentioned speed control knob 1 driving the speed control wire 7 to move, we also have another structure, the specific contents are as follows: the speed control wire 7 is fixedly connected to the speed control knob 1, and when the speed control knob 1 slides back and forth, the speed control wire 7 is driven to move synchronously for speed regulation.

[0049] This structure is not limited to electric screwdrivers, and other handheld power tools with adjustable speed are applicable to the patent structure, such as electric drills, impact drills, electric screwdrivers and electric wrenches.

[0050] The above is an introduction to the oil leakage prevention device for the reduction box of the electric tool provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A reduction gearbox oil leakage prevention device for an electric tool, comprising a housing, a speed regulating assembly, and a gear box arranged in the housing, wherein the speed regulating assembly comprises a movable speed regulating wire, the speed regulating wire extends into the gear box and adjusts the speed by moving, and the gear box is provided with a movable hole for the speed regulating wire to extend into the speed regulating hole, characterized in that: A blocking piece corresponding to the movable hole is arranged between the gear box and the housing, the blocking piece is elastic, and the blocking piece is pressed on the movable hole to block the movable hole.

2. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The area of ​​the blocking member used to block the movable hole is not less than the opening area of ​​the movable hole.

3. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The blocking piece is fixed to the outer shell, an embedding groove is arranged on the inner wall of the outer shell, the blocking piece is inserted into the embedding groove, and a part of the blocking piece protrudes from the embedding groove to block the movable hole.

4. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The blocking piece is fixed to the outer shell, and the blocking piece is glued and fixed to the inner wall of the outer shell.

5. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The blocking member is fixed by the clamping force between the inner wall of the housing and the outer wall of the gear box.

6. The reduction gearbox oil leakage prevention device for an electric tool according to claim 4 or 5, characterized in that: A gap is provided between the housing and the gear box for accommodating the blocking member, and the thickness of the blocking member in a natural state is not less than the width of the gap.

7. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The speed regulating wire is located between the gear box and the outer shell, and the speed regulating wire is straddled on the outside of the gear box. Both sides of the gear box are provided with movable holes for the ends of the speed regulating wire to extend into the speed regulation. The ends of the speed regulating wire on both sides have linkage parts extending toward the middle. The linkage parts on both sides respectively pass through the movable holes on both sides and extend into the gear box, so as to cooperate with the transmission gear inside the gear box.

8. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1 or 7, characterized in that: The blocking piece is pressed onto the outer side of the speed regulating wire at the same time.

9. The reduction gearbox oil leakage prevention device for an electric tool according to claim 7, characterized in that: The speed regulating assembly includes a speed regulating dial button slidably arranged on the outer shell, and the movement of the speed regulating wire is driven by the sliding of the speed regulating dial button. The speed regulating wire includes side edges located on both sides of the gear box, one side of the two side edges is connected by a top edge, and a linkage part extending into the gear box is arranged on the other side of the two side edges, and the middle parts of the two side edges are hinged to the gear box, and the top edge is movably connected to the speed regulating dial button. When the speed regulating dial button slides relative to the outer shell, the top edge is moved to make the linkage part located on the other side of the side edge swing for speed regulation.

10. The reduction gearbox oil leakage prevention device for an electric tool according to claim 1, characterized in that: The blocking piece is made of elastic silica gel or elastic rubber.

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