CN217530667U - Electric wrench for preventing oil leakage of gear box - Google Patents

Abstract

The utility model discloses an electric wrench of gear box leak protection oil, which comprises a housing, including a motor, an end cap, a controller, and a cover plate, the gear box back lid, the ring gear, the transmission shaft, a plurality of planetary gear, strike the seat, the square shaft, first shell and sleeve, the motor is installed in the casing, the motor is located the rear side of lid behind the gear box, be connected with motor gear on the motor shaft of motor, motor gear passes lid and planetary gear meshing behind the gear box, cover the through-hole that is equipped with power supply motor gear and passes behind the gear box, cover behind the gear box and be equipped with the seal groove, the seal groove is located the rear of through-hole, and communicate with the through-hole, be equipped with the sealing member between the inner wall of motor gear shaft and seal groove, the sealing member is used for sealing up the clearance between motor gear shaft and the seal groove inner wall, prevent that lubricating oil from covering's through-hole after the gear box from flowing out, effectively slow down the wearing and tearing of each part in the first shell, and prolonging service life.

Description

Electric wrench for preventing oil leakage of gear box

Technical Field

The utility model relates to an electric spanner especially relates to an electric spanner of gear box leak protection oil.

Background

The electric wrench is provided with an electric motor, the wrench head is driven by the electric motor to generate impact torque, and the bolt or the nut is quickly disassembled and assembled.

For example, a novel brushless electric wrench with publication number CN204149096U includes a socket bayonet lock, a socket, a first O-ring, an aluminum head housing, a second O-ring, a needle bearing, an output shaft gasket, a square shaft, an impact block, a first steel ball, a steel ball gasket, an impact compression spring, a second steel ball, an inner gear ring, a transmission shaft, a planetary gear pin, a planetary gear, a support pin gasket, a first bearing, a gear box, a motor gear, a stator, a rotor, a second bearing, a heat dissipation block, a control panel, a right housing, a rear cover, a forward/reverse rotation lever, a switch, a left housing and a socket.

The problem that current electric spanner exists: cover behind the gear box and be used for inserting to have the oil leak condition between the through-hole of motor output shaft and the motor output shaft, under the continuous oil leak condition, the impact seat and the square shaft structure of spanner can be because the grease is too little, and wearing and tearing appear easily, reduce the life of itself.

SUMMERY OF THE UTILITY MODEL

Based on it is not enough that there is the oil leak etc. behind the above-mentioned gear box lid, the utility model provides an electric spanner of gear box leak protection oil.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the electric wrench for preventing oil leakage of the gear box is characterized by comprising a shell, a motor, a gear box rear cover, an inner gear ring, a transmission shaft, a plurality of planetary gears, an impact seat, a square shaft, a head shell and a sleeve, the head shell is arranged at the front end of the machine shell, a gear box rear cover for sealing the head shell is arranged in an opening at the rear end of the head shell, the gear box rear cover and the head shell are enclosed to form an installation cavity, the inner gear ring is fixedly arranged in the mounting cavity, the planetary gear, the transmission shaft, the impact seat and the square shaft are all arranged in the mounting cavity, the planetary gear is rotatably arranged on the transmission shaft, the planetary gear is meshed with the inner side of the inner gear ring, the front end of the transmission shaft is inserted into the impact seat and is in transmission connection with the impact seat, an annular assembling groove is formed in one side, facing the inner gear ring, of the impact seat surface, a circle of steel balls are arranged in the assembling groove, a steel ball gasket is arranged on the rear side of each steel ball, an impact pressure spring is arranged on the rear side of each steel ball gasket, one end of each impact pressure spring abuts against each steel ball gasket, the other end of each impact pressure spring abuts against the transmission shaft, the square shaft is located on the front side of the impact seat, the front end of the square shaft extends out of the head shell, and is connected with a sleeve outside the head shell, the rear end of the square shaft is connected with an impact seat, the motor is arranged in the shell and is positioned at the rear side of the rear cover of the gear box, a motor gear is connected on the motor shaft of the motor, the motor gear penetrates through the rear cover of the gear box and is meshed with the planetary gear, the motor gear can drive the planetary gear to rotate, the rear cover of the gear box is provided with a through hole for the gear of the motor to pass through, the rear cover of the gear box is provided with a sealing groove which is positioned behind the through hole, and the sealing element is used for sealing a gap between the motor gear/motor shaft and the inner wall of the sealing groove.

The utility model discloses further preferred technical scheme does: the motor shaft is arranged in the sealing groove, the first bearing is sleeved on the motor shaft, the inner ring of the first bearing is connected with the motor shaft, the outer ring of the first bearing is connected with the inner wall of the sealing groove, the first bearing is located behind the sealing element, and the sealing element is inwards pressed on the inner wall of the sealing groove by the first bearing.

The utility model discloses further preferred technical scheme does: the tail part of the motor gear is provided with an integrally formed polished rod, the polished rod is locally positioned in the sealing groove, and the sealing element is arranged between the polished rod and the inner wall of the sealing groove and used for sealing a gap between the polished rod and the inner wall of the sealing groove.

The utility model discloses further preferred technical scheme does: the sealing element is an oil seal.

The utility model discloses further preferred technical scheme does: the sealing element is a sealing rubber ring.

The utility model discloses further preferred technical scheme does: the sealing element is a flat gasket.

The utility model discloses further preferred technical scheme does: the tail of the transmission shaft is fixed with an assembly block, the assembly block is hollow and provided with an assembly cavity, the planetary gear is rotatably installed in the assembly cavity through a planetary gear pin, a communication port communicated with the assembly cavity is formed in the side wall of the assembly block, and the planetary gear extends out of the communication port to be meshed with the inner side of the inner gear ring.

The utility model discloses further preferred technical scheme does: the transmission shaft is provided with two grooves on the circumferential side wall, steel balls are placed in the grooves, and the steel balls are abutted to the impact seat.

The utility model discloses further preferred technical scheme does: the square shaft comprises a shaft body and a base integrally formed with one end face of the shaft body, two convex blocks extending outwards are arranged on the circumferential outer wall of the base, one end, away from the base, of the shaft body is square, two linkage grooves matched with the two convex blocks are formed in the front end face of the impact seat, the two linkage grooves are communicated with each other, and the two convex blocks are inserted into the corresponding linkage grooves respectively and are in linkage connection with the impact seat.

The utility model discloses further preferred technical scheme does: the gear box rear cover is tightly matched and inserted in the opening at the rear part of the head shell, an annular groove is arranged on the outer wall of the gear box rear cover, an O-shaped ring is sleeved in the annular groove, and the O-shaped ring is tightly pressed between the gear box rear cover and the head shell.

Compared with the prior art, the utility model has the advantages that cover behind the gear box and be equipped with the seal groove, the seal groove is located the rear of through-hole, and with the through-hole intercommunication, be equipped with the sealing member between the inner wall of motor gear/motor shaft and seal groove, the sealing member is used for the clearance between sealed motor gear/motor shaft and the seal groove inner wall, prevents that lubricating oil from covering the through-hole after the gear box and flowing, effectively slows down the wearing and tearing of each part in the skull, improves life.

Drawings

The present invention will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be taken as limiting the scope of the present invention. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on the concept of a composition or construction of the object being described and may include exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is a schematic view of an overall structure of an electric wrench;

FIG. 2 is a schematic view of the internal structure of the electric wrench;

FIG. 3 is an exploded view of the electric wrench;

FIG. 4 is a schematic view of a transmission shaft;

fig. 5 is a cut-away view of the electric wrench.

In the figure: 1. a housing; 2. a grip; 3. a battery pack mounting groove; 4. a head shell; 5. an extension opening; 6. a sleeve; 7. a motor; 8. a gear box rear cover; 9. a fourth bearing; 10. an output shaft spacer; 11. a square shaft; 12. a shaft body; 13. a base; 14. a bump; 15. a linkage groove; 16. an impact base; 17. steel balls; 18. a steel ball gasket; 19. a drive shaft; 20. an inner gear ring; 21. a rear cover; 22. a second bearing mounting groove; 23. a right half shell; 24. a left half shell; 25. an insertion hole; 26. a communication port; 27. an assembly chamber; 28. assembling the blocks; 29. a protruding shaft; 30. a second bearing; 31. a motor shaft; 32. a fan; 33. a first bearing; 34. a sealing groove; 35. a seal member; 36. a first O-ring; 37. a first annular groove; 38. a third bearing; 39. a third bearing mounting groove; 40. a motor gear; 41. a polish rod; 42. impacting the pressure spring; 43. a fourth bearing mounting groove; 44. a second O-ring; 45. a second annular groove.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative only, and is not to be construed as limiting the scope of the invention.

It should be noted that: like reference numerals refer to like items in the following figures, and thus, once an item is defined in one figure, it may not be further defined or explained in subsequent figures.

Referring to fig. 1-5, the electric wrench for preventing oil leakage of a gear box comprises a machine shell 1, a motor 7, a gear box rear cover 8, an inner gear ring 20, a transmission shaft 19, a plurality of planet gears, an impact base 16, a square shaft 11, a head shell 4 and a sleeve 6.

The motor 7 is fixedly arranged in the machine shell 1.

The motor shaft 31 located at the rear side of the motor 7 is sleeved with the fan 32, the fan 32 is driven by the motor shaft 31 to rotate, when the motor 7 is started, the motor shaft 31 drives the fan 32 to rotate, and the fan 32 is used for dissipating heat of the motor 7.

In addition, a second bearing 30 is arranged between a motor shaft 31 positioned at the rear side of the motor 7 and the casing 1, and the second bearing 30 is sleeved on the motor shaft 31.

As shown in fig. 3, specifically, the housing 1 includes a left half shell 24, a right half shell 23 and a rear cover 21, the left half shell 24 and the right half shell 23 are fixedly connected together by screws, the rear cover 21 is fixedly connected to the rear ends of the left half shell 24 and the right half shell 23 by screws, a second bearing mounting groove 22 is formed on the inner wall of the rear cover 21, a second bearing 30 is assembled in the second bearing mounting groove 22, and a motor shaft 31 is inserted into the second bearing 30 and connected to the inner ring of the second bearing 30. The second bearing 30 functions to support the motor shaft 31 and reduce the rotational friction of the motor shaft 31, and can effectively prevent the motor shaft 31 from deflecting during rotation.

As shown in fig. 1-3, a handle 2 for hand holding is fixed at the bottom of the housing 1, a battery pack mounting groove 3 is arranged at the bottom of the handle 2, and the battery pack is inserted in the battery pack mounting groove 3 in a sliding manner.

The head housing 4 is installed at the front end of the casing 1, and preferably, the head housing 4 is fixedly connected to the front end of the casing 1 by screws.

The rear end of the head shell 4 is provided with an opening, a gear box rear cover 8 is installed in the opening at the rear end of the head shell 4, the gear box rear cover 8 is used for sealing the opening at the rear end of the head shell 4, and the gear box rear cover 8 and the head shell 4 are enclosed to form an installation cavity.

Preferably, be equipped with first step on the inner wall of head shell 4, lid 8 tight fit grafting is in the opening at head shell 4 rear portion behind the gear box, and supports on first step, be equipped with first annular groove 37 on the outer wall of lid 8 behind the gear box, first annular groove 37 endotheca is equipped with first O type circle 36, first O type circle 36 is compressed tightly between lid 8 and head shell 4 behind the gear box, first O type circle 36 has elasticity, lid 8 and head shell 4 interference fit behind first O type circle 36 and the gear box, first O type circle 36 is used for sealing up the gap between lid 8 and the head shell 4 behind the gear box.

The rear cover 8 of the gear box is positioned in the machine shell 1.

The inner gear ring 20 is fixedly installed in the installation cavity, preferably, a second step is arranged on the inner wall of the head shell 4, one side of the inner gear ring 20 abuts against the second step, the other side of the inner gear ring 20 abuts against the rear cover 8 of the gear box, and the inner gear ring 20 is tightly pressed on the second step and fixed by the rear cover 8 of the gear box.

As shown in fig. 5, the planetary gear, the transmission shaft 19, the impact socket 16 and the square shaft 11 are all disposed in the mounting cavity.

A plurality of planet gears are rotatably arranged on the transmission shaft 19, and the planet gears are in meshing connection with the inner side of the inner gear ring 20.

As shown in fig. 4, it is preferable that the rear end of the driving shaft 19 is provided with an integrally formed assembling block 28, the assembling block 28 has an assembling cavity 27 in the hollow inside, a plurality of planetary gears are rotatably installed in the assembling cavity 27 through planetary gear pins, communication ports 26 communicating with the assembling cavity 27 are provided on the side wall of the assembling block 28, and the planetary gears protrude from the communication ports 26 to be engaged with the inner side of the ring gear 20.

In addition, the rear end of the assembling block 28 is provided with a protruding shaft 29 protruding outwards, the inner wall of the gear box rear cover 8 is provided with a third bearing installation groove 39, a third bearing 38 is installed in the third bearing installation groove 39, and the protruding shaft 29 is inserted into the third bearing 38 and connected with the inner ring of the third bearing 38.

A spacer is arranged between the third bearing 38 and the mounting block 28, and the spacer is sleeved on the protruding shaft 29.

The motor 7 is positioned at the rear side of the gear box rear cover 8, a motor gear 40 is connected to a motor shaft 31 at the front side of the motor 7, the motor gear 40 penetrates through the gear box rear cover 8 to be meshed with the planetary gear, and the motor gear 40 can drive the planetary gear to rotate.

The rear cover 8 of the gear box is provided with a through hole for the motor gear 40 to pass through, the protruding shaft 29 is provided with an insertion hole 25 communicated with the assembly cavity 27, and the motor gear 40 passes through the insertion hole and the through hole to be meshed with the planetary gear in the assembly cavity 27.

When the motor 7 drives the motor gear 40 to rotate, the motor gear 40 drives the planetary gear to rotate around the inner side of the inner gear ring 20, and the planetary gear drives the transmission shaft 19 to rotate.

In addition, a sealing groove 34 is formed in the gear box rear cover 8, the sealing groove 34 is located behind the through hole, the sealing groove 34 is communicated with the through hole, the motor gear 40 penetrates through the sealing groove 34, a sealing element 35 is arranged between the motor gear 40/the motor shaft 31 and the inner wall of the sealing groove 34, and the sealing element 35 is used for sealing a gap between the motor gear 40/the motor shaft 31 and the inner wall of the sealing groove 34 and preventing lubricating oil in the mounting cavity from leaking out of the sealing groove 34.

Preferably, the motor gear 40 is provided at a rear portion thereof with an integrally formed polish rod 41, the polish rod 41 is partially located in the sealing groove 34, and a sealing member 35 is provided between the polish rod 41 and an inner wall of the sealing groove 34 for sealing a gap between the polish rod 41 and the inner wall of the sealing groove 34.

The seal 35 is a commercially conventional sealing structure such as a sealing rubber ring or an annular flat gasket. Preferably, the sealing element 35 is an oil seal, and the sealing element 35 is sleeved on the polish rod 41 and attached to the inner wall of the sealing groove 34 for sealing the gap between the polish rod 41 and the inner wall of the sealing groove 34.

In addition, a first bearing 33 is further installed in the seal groove 34, the first bearing 33 is sleeved on the motor shaft 31, an inner ring of the first bearing 33 is connected with the motor shaft 31, an outer ring of the first bearing 33 is connected with the inner wall of the seal groove 34, the first bearing 33 is located behind the seal 35, and the seal 35 is pressed inwards on the inner wall of the seal groove 34 by the first bearing 33.

The front end of the transmission shaft 19 is inserted into the impact seat 16 and is in transmission connection with the impact seat 16, specifically, a through hole is formed in the center of the impact seat 16, two grooves are formed in the circumferential side wall of the transmission shaft 19, steel balls are placed in the grooves, the front end portion of the transmission shaft 19 is inserted into the through hole, and the steel balls are abutted to the impact seat 16. The connecting structure of the transmission shaft 19 and the impact base 16 is the existing structure of the electric wrench in the market, and reference can be made to the connecting structure of the central shaft and the active impact block in the lithium electric wrench with the patent publication number of CN106041838a, and the connecting structure of the main shaft and the impact sleeve in the patent CN 2768980Y.

In addition, an annular assembling groove is formed in one side, facing the inner gear ring 20, of the impact base 16, a ring of steel balls 17 are arranged in the assembling groove, a steel ball gasket 18 is arranged on the rear side of each steel ball 17, an impact pressure spring 42 is arranged on the rear side of each steel ball gasket 18, one end of each impact pressure spring 42 abuts against each steel ball gasket 18, and the other end of each impact pressure spring 42 abuts against an assembling block 28 of the transmission shaft 19.

The square shaft 11 is positioned at the front side of the impact seat 16, the front end of the square shaft 11 extends out of the extension opening 5 at the front part of the head shell 4 and is connected with the sleeve 6 outside the head shell 4, and the rear end of the square shaft 11 is connected with the impact seat 16.

Specifically, the square shaft 11 includes a shaft body 12 and a base 13 integrally formed with one end face of the shaft body 12, two lugs 14 extending outwards are arranged on the circumferential outer wall of the base 13, one end of the shaft body 12, which is far away from the base 13, is square, two linkage grooves 15 matched with the two lugs 14 are arranged on the front end face of the impact seat 16, the two linkage grooves 15 are communicated with each other, and the two lugs 14 are respectively inserted into the corresponding linkage grooves 15 to be in linkage connection with the impact seat 16. The structure of the impact socket 16 connected to the square shaft 11 is the same as that of the conventional electric wrench. Reference may be made to the connection structure of the impact block and the square shaft in patent CN106041838a and the connection structure of the impact block and the square shaft in patent CN 204149096U.

In addition, a fourth bearing installation groove 43 is formed in the inner side of the extension opening 5, a fourth bearing 9 is installed in the fourth bearing installation groove 43, the square shaft 11 penetrates through the center of the fourth bearing 9, the square shaft 11 is connected with the inner ring of the fourth bearing 9, and the outer ring of the fourth bearing 9 is connected with the inner wall of the fourth bearing installation groove 43.

An output shaft gasket 10 is arranged between the two convex blocks 14 and the inner wall of the head shell 4, and the output shaft gasket 10 is installed on the head shell 4 and sleeved on the square shaft 11.

The front part of the square shaft 11 is clamped with the sleeve 6 through a clamping pin, a second annular groove 45 is formed in the circumferential outer wall of the square shaft 11, a second O-shaped ring 44 is sleeved in the second annular groove 45, and the second O-shaped ring 44 abuts between the square shaft 11 and the sleeve 6.

Other structures of the electric wrench are the same as those of the existing electric wrench, such as a switch, a forward and reverse rotation deflector rod and the like.

It is right above the utility model provides an electric spanner of gear box leak protection oil has introduced, and it is right to have used specific individual example here the utility model discloses a principle and embodiment have explained, and the description of above embodiment only is used for helping to understand the utility model discloses and core thought. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.

Claims (10)

1. The electric wrench for preventing oil leakage of the gear box is characterized by comprising a shell, a motor, a gear box rear cover, an inner gear ring, a transmission shaft, a plurality of planetary gears, an impact seat, a square shaft, a head shell and a sleeve, the head shell is arranged at the front end of the machine shell, a gear box rear cover for sealing the cover is arranged in an opening at the rear end of the head shell, the gear box rear cover and the head shell enclose to form an installation cavity, the inner gear ring is fixedly arranged in the mounting cavity, the planetary gear, the transmission shaft, the impact seat and the square shaft are all arranged in the mounting cavity, the planetary gear is rotatably arranged on the transmission shaft, the planetary gear is meshed with the inner side of the inner gear ring, the front end of the transmission shaft is inserted into the impact seat and is in transmission connection with the impact seat, an annular assembling groove is formed in one side, facing the inner gear ring, of the impact seat surface, a circle of steel balls are arranged in the assembling groove, a steel ball gasket is arranged on the rear side of each steel ball, an impact pressure spring is arranged on the rear side of each steel ball gasket, one end of each impact pressure spring abuts against each steel ball gasket, the other end of each impact pressure spring abuts against the transmission shaft, the square shaft is located on the front side of the impact seat, the front end of the square shaft extends out of the head shell, and is connected with a sleeve outside the head shell, the rear end of the square shaft is connected with an impact seat, the motor is arranged in the shell and is positioned at the rear side of the rear cover of the gear box, a motor shaft of the motor is connected with a motor gear, the motor gear penetrates through the rear cover of the gear box and is meshed with the planetary gear, the motor gear can drive the planetary gear to rotate, the rear cover of the gear box is provided with a through hole for the gear of the motor to pass through, the rear cover of the gear box is provided with a sealing groove which is positioned behind the through hole, and the sealing element is used for sealing a gap between the motor gear/motor shaft and the inner wall of the sealing groove.

2. An oil leakage preventing electric wrench for a gearbox as claimed in claim 1, wherein a first bearing is installed in the seal groove, the first bearing is sleeved on the motor shaft, an inner ring of the first bearing is connected with the motor shaft, an outer ring of the first bearing is connected with the inner wall of the seal groove, the first bearing is located behind the seal, and the first bearing presses the seal inwards on the inner wall of the seal groove.

3. An oil leakage preventing electric wrench for a gear box as claimed in claim 2, wherein an integrally formed polish rod is provided at the end of the motor gear, the polish rod is partially located in the sealing groove, and a sealing member is provided between the polish rod and the inner wall of the sealing groove for sealing the gap between the polish rod and the inner wall of the sealing groove.

4. An electric wrench for preventing oil leakage from a gearbox according to claim 1, 2 or 3, wherein the seal is an oil seal.

5. An electric wrench for preventing oil leakage of a gearbox according to claim 1, 2 or 3, wherein the sealing member is a sealing rubber ring.

6. An electric wrench for preventing oil leakage of a gearbox according to claim 1, 2 or 3, wherein the sealing member is a flat gasket.

7. An oil leakage preventing electric wrench for a gearbox as defined in claim 1, wherein a mounting block is fixed to a rear portion of the transmission shaft, the mounting block has a hollow mounting cavity therein, the planetary gear is rotatably mounted in the mounting cavity through a planetary gear pin, a communication port communicating with the mounting cavity is provided on a side wall of the mounting block, and the planetary gear extends out of the communication port to engage with an inner side of the inner ring gear.

8. An oil leakage preventing electric wrench for a gearbox according to claim 1, wherein two grooves are provided on the circumferential side wall of the transmission shaft, a steel ball is placed in each groove, and the steel ball abuts against the impact seat.

9. An oil leakage preventing electric wrench for a gearbox according to claim 1, wherein the square shaft includes a shaft body and a base integrally formed with an end surface of the shaft body, two protrusions extending outward are provided on a circumferential outer wall of the base, an end of the shaft body away from the base is square, the end surface of the front end of the impact base is provided with two linking grooves matched with the two protrusions, the two linking grooves are communicated with each other, and the two protrusions are respectively inserted into the corresponding linking grooves and linked with the impact base.

10. An oil leakage preventing electric wrench for a gearbox as claimed in claim 1, wherein the rear cover of the gearbox is tightly fitted into the opening at the rear part of the head housing, an annular groove is formed in the outer wall of the rear cover of the gearbox, an O-ring is sleeved in the annular groove, and the O-ring is tightly pressed between the rear cover of the gearbox and the head housing.

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