An oil leakage-proof electric wrench

Abstract

The application discloses an oil leakage prevention electric wrench, which comprises a shell, a function part, a holding part and a plug-in part from top to bottom, a motor, a reduction gear and an impact assembly are sequentially arranged in the function part from left to right, the reduction gear comprises an inner gear ring and a plurality of planetary gears meshing with the inner gear ring, an inner shell and an outer shell are assembled with each other to form an installation cavity, the reduction gear and the impact assembly are installed in the installation cavity, a separation ring extends inwardly on the inner wall of a left through hole, a first sealing bearing sleeved on a motor output shaft and a second sealing bearing sleeved on an installation column are arranged on the left and right sides of the separation ring respectively, the sealing bearings are used for sealing the left through hole, a metal friction shaft sleeve is sleeved on the motor gear, the metal friction shaft sleeve is located in the gap between the motor gear and the installation column, static friction occurs between the metal friction shaft sleeve and one of the motor gear or the installation column, and oil leakage is prevented.

Description

Technical Field

[0001] This application relates to the field of electric wrench technology, and in particular to an oil-proof electric wrench. Background Technology

[0002] An electric wrench is a power tool that uses an electric motor as its power source. After the power is reduced by planetary gears, it transmits the power to a square shaft, which in turn drives the socket to rotate. It can reduce the speed and increase the torque to loosen or tighten screws and other parts. When the torque is insufficient, its impact component comes into play. By driving the axial reciprocating motion of the impact seat, it intermittently and momentarily strikes the square shaft to increase the instantaneous torque.

[0003] Components such as reduction gears and drive shafts require lubrication to minimize wear and ensure smooth rotation. However, in operating environments, oil often leaks through gaps to the motor side. This affects the motor's normal operation and reduces its lifespan. Furthermore, oil leakage weakens lubrication, increases component wear, and also reduces the motor's lifespan. Therefore, sealing the oil in a specific area to prevent leakage has become a problem that needs to be solved in the electric wrench industry.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, this application provides an oil-proof electric wrench to solve one of the above-mentioned technical problems.

[0006] The technical solution adopted by this application to solve its technical problem is: an oil-leakage-proof electric wrench, comprising: a housing, which includes a functional part, a gripping part, and a plugging part from top to bottom; a motor, a reduction gear, and an impact component are arranged horizontally inside the functional part; the reduction gear includes an internal gear ring and several planetary gears meshing with the internal gear ring; an inner housing and an outer housing, which are assembled together to form a mounting cavity; the reduction gear and the impact component are installed in the mounting cavity; the inner housing has a left through hole, and the outer housing has a right through hole; the inner housing is placed inside the functional part, and the outer housing is simultaneously fixed to the end of the functional part; the impact component extends from the right through hole and blocks the right through hole; the impact component is used to transmit torque and provide instantaneous impact to increase torque. The device includes a drive shaft with a mounting post formed on it. Several assembly slots are provided within the mounting post, and the planetary gear is placed within one of these slots. The motor includes a motor output shaft that passes through it. The motor output shaft extends into the mounting cavity through a left through-hole, and a motor gear that meshes with the planetary gear is fixed to the end of the motor output shaft. A partition ring extends inward from the inner wall of the left through-hole. A first sealing bearing fitted on the motor output shaft and a second sealing bearing fitted on the mounting post are respectively provided on the left and right sides of the partition ring. The sealing bearings are used to seal the left through-hole. A metal friction bushing is fitted onto the motor gear, located within the gap between the motor gear and the mounting post, and capable of static friction with either the motor gear or the mounting post.

[0007] In some embodiments, the cross-section of the metal friction bushing is wedge-shaped.

[0008] In some embodiments, a contact ring extends from the left end of the mounting post, the inner wall of the contact ring being in close contact with the metal friction bushing, and the outer wall being in close contact with the second sealed bearing.

[0009] In some embodiments, the first sealing bearing and the second sealing bearing have the same diameter as the left through hole, and both can fit tightly against the inner wall of the left through hole.

[0010] In some embodiments, the impact assembly further includes an impact seat and a square shaft. The impact seat is placed in the mounting cavity, and a mounting groove is formed on its inner side. A plurality of steel balls and a single spring are disposed at the bottom of the mounting groove. The spring is sleeved on the drive shaft, with one end abutting against the mounting post and the other end abutting against the steel balls.

[0011] In some embodiments, a limiting post is formed on the square shaft, and a pair of protruding striking blocks are formed on the edge of the limiting post. An insertion hole is provided at the axial end of the limiting post, and the end of the drive shaft is inserted into the insertion hole and abuts against the square shaft.

[0012] In some embodiments, a rolling bearing is sleeved on the square shaft, the outer wall of the rolling bearing is in close contact with the inner wall of the right through hole, and a washer is provided between the rolling bearing and the limiting post.

[0013] In some embodiments, a pair of protrusions matching the striking block are formed on the outer surface of the impact seat, and a receiving groove is formed between the protrusions, allowing the striking block to be placed in the receiving groove.

[0014] In some embodiments, a sleeve is fitted onto the right end of the square shaft.

[0015] In some embodiments, an annular groove is formed on the end face of the inner housing, and a plug-in post is formed on the end face of the outer housing. A sealing ring is fitted in the annular groove, and the plug-in post is inserted into the annular groove and abuts against the sealing ring.

[0016] The beneficial effects of this application are as follows: the inner and outer shells are assembled together by the annular groove and the plug-in post to form an installation cavity, and the planetary gear and other components that require oil lubrication are set inside. The left and right through holes are sealed by the first density bearing and the second sealing bearing, respectively. This not only ensures the normal rotation of the motor output shaft, the square shaft and other components, but also creates a relatively sealed space in the installation cavity to prevent oil from leaking into the motor location.

[0017] Furthermore, to fill the gaps and further prevent oil leakage, a metal friction sleeve is installed between the motor gear and the contact ring. This metal friction sleeve rotates with either the motor gear or the contact ring, thus serving to seal and block oil leakage without affecting the differential rotation between the two. In summary, this application achieves a good oil leakage prevention effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional schematic diagram of this application.

[0020] Figure 2 This is an exploded view of the internal components of the functional section of this application.

[0021] Figure 3 This is an exploded schematic diagram of the inner and outer shells of this application.

[0022] Figure 4 This is a schematic diagram of the reduction gear installation in this application.

[0023] Figure 5 This is an exploded schematic diagram of the square shaft and drive shaft of this application.

[0024] Reference numerals: 1. Housing; 101. Functional part; 102. Grip part; 103. Connecting part; 2. Motor; 3. Internal gear ring; 4. Planetary gear; 5. Inner housing; 501. Separator ring; 6. Outer housing; 7. Mounting cavity; 8. Left through hole; 9. Right through hole; 10. Drive shaft; 1001. Mounting post; 1002. Contact ring; 11. Assembly groove; 12. Motor output shaft; 13. First seal. 14. Bearing, Second Sealed Bearing, 15. Metal Friction Bushing, 16. Motor Gear, 17. Impact Seat, 18. Square Shaft, 1801. Limiting Post, 19. Steel Ball, 20. Spring, 21. Impact Block, 22. Insertion Hole, 23. Rolling Bearing, 24. Washer, 25. Protrusion, 26. Receiving Groove, 27. Sleeve, 28. Annular Groove, 29. Insertion Post, 30. Sealing Ring, 31. Mounting Groove. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0026] In the embodiments of this application, please refer to Figure 1-5As shown, this type of oil-proof electric wrench mainly includes: a housing 1, which from top to bottom includes a functional part 101, a grip part 102, and a plug-in part 103. The grip part 102 serves as a handle for gripping, while the plug-in part 103 is used for plugging in a battery pack. Inside the functional part 101, a motor 2, a reduction gear, and an impact component are arranged horizontally in sequence. The reduction gear includes an internal gear ring 3 and several planetary gears 4 meshing with the internal gear ring 3. An inner housing 5 and an outer housing 6 are assembled together to form a mounting cavity 7. The mounting cavity 7... The inner housing 5 has a left through hole 8, and the outer housing 6 has a right through hole 9. The inner housing 5 is placed inside the functional part 101, and the outer housing 6 is fixed to the end of the functional part 101. The impact assembly extends from the right through hole 9 and blocks the right through hole 9. The impact assembly is used to transmit torque and provide instantaneous impact to increase torque. It includes a drive shaft 10, on which a mounting post 1001 is formed. The mounting post 1001 has an internal opening. The system includes several assembly slots 11, within which the planetary gear 4 is placed. The motor 2 includes a motor output shaft 12 that passes through it. The motor output shaft 12 extends into the mounting cavity 7 through the left through hole 8. A motor gear 16, meshing with the planetary gear 4, is fixed to the end of the motor output shaft 12. A partition ring 501 extends inwardly from the inner wall of the left through hole 8. A first sealing bearing 13 fitted onto the motor output shaft 12 and a mounting bearing 16 fitted onto the mounting cavity 7 are respectively provided on the left and right sides of the partition ring 501. The second sealing bearing 14 on the column 1001 is used to seal the left through hole 8. A metal friction bushing 15 is sleeved on the motor 2 gear 16. The metal friction bushing 15 is located in the gap between the motor 2 gear 16 and the mounting column 1001. It can generate static friction with either the motor 2 gear 16 or the mounting column 1001, so that the metal friction bushing 15 rotates accordingly without affecting the rotation of the motor 2 gear 16 and the mounting column 1001. It can seal the gap and prevent oil from leaking from the gap.

[0027] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0028] like Figure 1 As shown, the metal friction bushing 15 has a wedge-shaped cross section. The wedge design causes the friction bushing to generate radial preload after installation, which tightly fits the motor 2 gear 16 and the mounting post 1001. This not only improves the friction effect but also forms a dynamic sealing barrier to adapt to thermal expansion and contraction caused by temperature changes.

[0029] Furthermore, a contact ring 1002 extends axially from the left end of the mounting post 1001. The inner wall of the contact ring 1002 is in close contact with the metal friction bushing 15, and the outer wall is in close contact with the second sealing bearing 14. The contact ring 1002 can rotate smoothly after assembly through the second sealing bearing 14, and at the same time, it can eliminate any gaps that may leak oil.

[0030] Specifically, the left through hole 8 is divided into two ends with different diameters by the partition ring 501. The first sealing bearing 13 and the second sealing bearing 14 have the same diameter as each segment of the left through hole 8, and can fit tightly against the inner wall of the left through hole 8, thus playing a role in multiple sealing of the left through hole 8 and effectively preventing leakage.

[0031] like Figure 2 As shown, the impact assembly also includes an impact seat 17 and a square shaft 18. The impact seat 17 is placed inside the mounting cavity 7, and a mounting groove is formed on its inner side. Several steel balls 19 and a single spring 20 are provided at the bottom of the mounting groove. The spring 20 is sleeved on the transmission shaft 10, with one end abutting against the mounting post 1001 and the other end abutting against the steel balls 19. The impact assembly is a component that, when the torque is insufficient, reciprocates and resets under the action of the steel balls 19, spring 20, groove, and other structures or components, generating intermittent impacts to improve the instantaneous torque. This is a common technical means in the field. The specific working principle and structure are the same as those of a novel brushless electric wrench disclosed in announcement number CN204149096U.

[0032] Furthermore, a limiting post 1801 is formed on the square shaft 18, and a pair of protruding striking blocks 21 are formed on the edge of the limiting post 1801. An insertion hole 22 is provided at the axial end of the limiting post 1801. The end of the drive shaft 10 is inserted into the insertion hole 22 and abuts against the square shaft 18. The drive shaft 10 presses and fixes the axial position of the square shaft 18 through the insertion hole 22.

[0033] Specifically, a rolling bearing 23 is fitted on the square shaft 18, which can reduce the rotational friction of the square shaft 18. The outer wall of the rolling bearing 23 is in close contact with the inner wall of the right through hole 9. A washer 24 is provided between the rolling bearing 23 and the limiting post 1801 to provide axial support, prevent the bearing from loosening, and assist in sealing the right through hole 9 to reduce oil leakage. Together, they can play a certain role in sealing and preventing leakage.

[0034] Furthermore, a pair of protrusions 25 matching the striking block 21 are formed on the outer surface of the impact seat 17, and a receiving groove 26 is formed between the protrusions 25, allowing the striking block 21 to be placed within the receiving groove 26. Under normal torque, the striking block 21 is placed within the receiving groove 26 and rotates synchronously with the impact seat 17; under overload, after the impact seat 17 retracts, it resets under the action of the spring 20, generating an impact and producing a momentary large torque to increase the twisting force.

[0035] Specifically, a sleeve 27 is fitted on the right end of the square shaft 18. The sleeve 27 is fixed on the square shaft 18 and can be quickly replaced to adapt to different specifications of parts to be screwed. The inner wall of the sleeve 27 has anti-slip texture to improve the engagement force with the parts to be screwed.

[0036] In some embodiments, an annular groove 28 is formed on the end face of the inner housing 5, and a plug-in post 29 is formed on the end face of the outer housing 6. A sealing ring 30 is fitted in the annular groove 28, and the plug-in post 29 is inserted into the annular groove 28 and abuts against the sealing ring 30. Specifically, it is an O-ring sealing ring 30, so that the mounting cavity 7 formed between the inner housing 5 and the outer housing 6 becomes a closed space to prevent oil leakage, further improve the service life of internal components, and reduce maintenance costs.

[0037] Furthermore, the switches and other electronic control devices of this application are disposed within the housing 1 in the area where the grip portion 102 is located, as is the conventional design in the art.

[0038] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An oil-proof electric wrench, characterized in that, include: The housing includes, from top to bottom, a functional part, a gripping part, and a plugging part. Inside the functional part, a motor, a reduction gear, and an impact component are arranged horizontally in sequence. The reduction gear includes an internal gear ring and several planetary gears that mesh with the internal gear ring. The inner shell and the outer shell are assembled together to form an installation cavity. The reduction gear and the impact assembly are installed in the installation cavity. The inner shell has a left through hole and the outer shell has a right through hole. The inner shell is placed inside the functional part, and the outer shell is fixed to the end of the functional part. The impact assembly extends from the right through hole and blocks the right through hole. The impact assembly is used to transmit torque and provide instantaneous impact to increase torque. It includes a drive shaft with a mounting post formed on the drive shaft. The mounting post has several mounting slots, and the planetary gear is placed in the mounting slots. The motor includes a motor output shaft that passes through the motor. The motor output shaft extends into the mounting cavity through the left through hole. A motor gear that meshes with the planetary gear is fixed at the end of the motor output shaft. A partition ring extends inward from the inner wall of the left through hole. A first sealing bearing sleeved on the motor output shaft and a second sealing bearing sleeved on the mounting column are respectively provided on the left and right sides of the partition ring. The sealing bearings are used to seal the left through hole. A metal friction bushing is sleeved on the motor gear. The metal friction bushing is located in the gap between the motor gear and the mounting column and can generate static friction with either the motor gear or the mounting column.

2. The oil-proof electric wrench according to claim 1, characterized in that, The cross-section of the metal friction bushing is wedge-shaped.

3. The oil-proof electric wrench according to claim 1, characterized in that, A contact ring extends from the left end of the mounting post. The inner wall of the contact ring is in close contact with the metal friction bushing, and the outer wall is in close contact with the second sealed bearing.

4. The oil-proof electric wrench according to claim 1, characterized in that, The first and second sealing bearings have the same diameter as the left through hole, and both can fit tightly against the inner wall of the left through hole.

5. The oil-proof electric wrench according to claim 1, characterized in that, The impact assembly also includes an impact seat and a square shaft. The impact seat is placed in the mounting cavity, and an mounting groove is formed on its inner side. Several steel balls and a single spring are provided at the bottom of the mounting groove. The spring is sleeved on the drive shaft, with one end abutting against the mounting post and the other end abutting against the steel ball.

6. The oil-proof electric wrench according to claim 5, characterized in that, A limiting post is formed on the square shaft, and a pair of protruding striking blocks are formed on the edge of the limiting post. An insertion hole is opened at the axial end of the limiting post, and the end of the transmission shaft is inserted into the insertion hole and abuts against the square shaft.

7. The oil-proof electric wrench according to claim 6, characterized in that, A rolling bearing is fitted on the square shaft, the outer wall of the rolling bearing is in close contact with the inner wall of the right through hole, and a washer is provided between the rolling bearing and the limiting post.

8. The oil-proof electric wrench according to claim 6, characterized in that, The outer surface of the impact seat has a pair of protrusions that match the striking block, and a receiving groove is formed between the protrusions, so that the striking block can be placed in the receiving groove.

9. The oil-proof electric wrench according to claim 5, characterized in that, A sleeve is fitted onto the right end of the square shaft.

10. The oil-proof electric wrench according to claim 1, characterized in that, An annular groove is formed on the end face of the inner shell, and a plug-in post is formed on the end face of the outer shell. A sealing ring is installed in the annular groove, and the plug-in post is inserted into the annular groove and abuts against the sealing ring.

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