CN218556912U

CN218556912U - Impact wrench

Info

Publication number: CN218556912U
Application number: CN202222600070.3U
Authority: CN
Inventors: 宋建飞; 吴志刚
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-03
Anticipated expiration: 2032-09-29

Abstract

The utility model relates to an impact wrench, include: the impact mechanism comprises an intermediate shaft connected with the gear reduction mechanism, an active impact block driven by the intermediate shaft to rotate, a passive impact block meshed with the active impact block and an elastic piece arranged between the gear reduction mechanism and the active impact block, wherein the elastic piece is sleeved on the periphery of the intermediate shaft; the intermediate shaft comprises a first intermediate shaft and a second intermediate shaft which are fixed in the circumferential direction, the first intermediate shaft is connected to the front end of the gear reduction mechanism, and the second intermediate shaft is connected with the driving impact block and can move longitudinally relative to the first intermediate shaft. Compared with the prior art, the elastic part sleeved on the middle shaft has larger compression amount, so that elastic potential energy is accumulated more quickly, and the torsion force reaches the nominal value of workpieces such as nuts, screws and clamps more quickly.

Description

Impact wrench

[ technical field ]

The utility model relates to an impact wrench, in particular to impact wrench capable of rapidly amplifying torque force.

[ background art ]

Impact wrenches are tools used to turn screws, bolts, clamps, etc. Impact wrenches typically include a drive motor, a gear reduction mechanism, and an impact device including an active impact block, a passive impact block, a working shaft, etc. The driving impact block is driven by the output shaft of the gear speed reducing mechanism, and the driven impact block can be meshed with the driving impact block to be driven by rotation. The working shaft is connected to the passive impact block and is driven by the passive impact block to rotate, wherein the active impact block is selectively disengaged from the passive impact block when the load borne by the working shaft is increased to a specific value, and then is re-engaged with the passive impact block under the rotation drive of the output shaft, so that intermittent impact is applied to the working shaft in the rotation direction.

The impact wrench realizes the increase of the output torque of the bolt by continuously striking the passive impact block, and the longer the duration is, the larger the torque applied to the bolt is. In the prior art, in an impact wrench, the duration of impact is positively correlated with the locking torque of a bolt within a certain time range, so that a longer impact time is needed to obtain a larger torque. For construction occasions where bolt locking and the like are expected to be achieved quickly, the existing impact wrench cannot meet the requirements.

Accordingly, there is a need for an improved impact wrench that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the deficiency of the prior art, an object of the utility model is to provide a can enlarge impact wrench of torsion fast.

The utility model provides a technical scheme that prior art problem adopted is: an impact wrench, comprising: the impact mechanism comprises an intermediate shaft connected to the gear reduction mechanism, an active impact block driven by the intermediate shaft to rotate, a passive impact block meshed with the active impact block and an elastic piece arranged between the gear reduction mechanism and the active impact block, wherein the passive impact block is sleeved on the periphery of the intermediate shaft; wherein the intermediate shafts include a first intermediate shaft and a second intermediate shaft that are circumferentially fixed to each other, the first intermediate shaft being connected to a front end of the gear reduction mechanism, the second intermediate shaft being connected to the active impact block and being provided so as to be movable in a longitudinal direction with respect to the first intermediate shaft.

The further improvement scheme is as follows: the first intermediate shaft is provided with a receiving hole which is inwards sunken from the longitudinal front end surface, and the longitudinal rear end of the second intermediate shaft is contained in the receiving hole and is in clearance fit with the receiving hole.

The further improvement scheme is as follows: the first intermediate shaft is provided with a through hole which is positioned on the side wall and communicated with the receiving hole, the through hole is a waist-shaped hole extending along the longitudinal direction, the second intermediate shaft is provided with a connecting piece protruding outwards from the longitudinal rear end, and the connecting piece penetrates through the through hole and slides along the longitudinal direction in the through hole.

The further improvement scheme is as follows: the first intermediate shaft is provided with two through holes which are symmetrical along the radial direction, the second intermediate shaft is provided with a mounting hole which extends along the radial direction vertical to the longitudinal direction, the connecting piece is a pin, the pin is tightly matched with the mounting hole, and the pin penetrates through the through holes and slides along the longitudinal direction in the through holes.

The further improvement scheme is as follows: the reset structure comprises an elastic piece which protrudes and extends along the longitudinal direction, the elastic piece is sleeved on the periphery of the intermediate shaft, one end of the elastic piece is abutted against the driving impact block, and the other end of the elastic piece is abutted against the gear reduction mechanism.

The further improvement scheme is as follows: the active impact block is sleeved on the second intermediate shaft and provided with an open slot facing the motor, and a ball and a gasket accommodated in the open slot, the gasket covers the ball, the elastic part is partially received in the open slot, and one end of the elastic part is pressed against the gasket.

The further improvement scheme is as follows: the gear reduction mechanism comprises a planet carrier which is integrally arranged with the first intermediate shaft, the planet carrier is provided with a step surface which is transited to the first intermediate shaft, and the other end of the elastic part is pressed against the step surface.

The further improvement scheme is as follows: the impact mechanism further comprises a steel ball arranged between the periphery of the second intermediate shaft and the inner wall of the active impact block, the second intermediate shaft is provided with a rolling groove located on the periphery, the active impact block is provided with an accommodating groove located on the inner wall, and the steel ball is accommodated in the rolling groove and the accommodating groove at the same time.

The further improvement scheme is as follows: the impact mechanism further comprises a working head connected to the front end of the passive impact block, and the working head is exposed out of the shell.

The further improvement scheme is as follows: the motor casing comprises a motor casing for accommodating the motor and a reduction gearbox sleeve connected to the longitudinal front end of the motor casing, the reduction gearbox sleeve accommodates the gear reduction mechanism and the impact mechanism, and the reduction gearbox sleeve is provided with a shaft sleeve for circumferentially supporting the passive impact block and a buffer ring arranged between the shaft sleeve and the passive impact block.

Compared with the prior art, the utility model discloses following beneficial effect has: the application provides an impact wrench compares in prior art, but with the jackshaft split for relative displacement's first jackshaft and second jackshaft, so, the elastic component that the cover was located on the jackshaft can have bigger compression volume when moving to the compression direction, thereby accumulate bigger elastic potential energy, make torsion reach the nominal value that can wrench movement work piece such as nut, screw, anchor clamps sooner, improve impact wrench's work efficiency, adapt to the work needs of construction occasion, solve the technical problem of inefficiency among the prior art.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is a perspective view of an impact wrench in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the impact wrench of FIG. 1 with one half of the housing removed;

FIG. 3 is an exploded view of the impact wrench of FIG. 1;

fig. 4 is a schematic view of the structure of the intermediate shaft inside the impact wrench shown in fig. 3.

The meaning of the reference symbols in the figures:

100. electric wrench 1, casing 2, motor

3. Gear speed reducing mechanism 41a, first intermediate shaft 42, active impact block

43. Passive impact block 41b, second intermediate shaft 44, elastic member

413. Through hole 45, connecting piece 421, open slot

46. Ball 47, washer 31, and carrier

311. Step surface 48, steel ball 431 and rolling groove

5. Working head 6, locating ring 7 and shaft sleeve

8. Buffer ring 9, rubber ring 13 and reduction box sleeve

411. Receiving hole

[ detailed description of the invention ]

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Referring to fig. 1 and fig. 2, for the impact wrench 100 according to the present invention, the impact wrench 100 includes: the impact mechanism comprises a machine shell 1 extending along the longitudinal direction, a motor 2 arranged in the machine shell 1, a gear reduction mechanism 3 driven by the motor 2 and an impact mechanism connected to the longitudinal front end of the gear reduction mechanism 3, wherein the impact mechanism is used for converting the rotary motion output by the gear reduction mechanism 3 into rotary-impact motion and comprises an intermediate shaft connected to the gear reduction mechanism 3, an active impact block 42 driven by the intermediate shaft to rotate, a passive impact block 43 meshed with the active impact block 42 and an elastic piece 44 arranged between the gear reduction mechanism 3 and the active impact block 42, and the elastic piece 44 is sleeved on the periphery of the intermediate shaft; wherein the intermediate shafts comprise a first intermediate shaft 41a and a second intermediate shaft 41b which are circumferentially fixed with each other, the first intermediate shaft 41a is connected to the front end of the gear reduction mechanism 3, and the second intermediate shaft 41b is connected with the driving impact block 42 and is arranged to be movable in the longitudinal direction relative to the first intermediate shaft 41 a. Compared with the prior art, the split intermediate shaft is divided into the first intermediate shaft 41a and the second intermediate shaft 41b which can move relatively, so that the elastic piece 44 sleeved on the intermediate shaft can have larger compression amount when moving towards the compression direction, and larger elastic potential energy is accumulated, so that the torsion can reach the nominal value of workpieces such as a nut, a screw and a clamp which can be twisted more quickly, the working efficiency of the impact wrench 100 is improved, the working requirement of construction occasions is met, and the technical problem of low impact efficiency in the prior art is solved.

The impact mechanism further comprises a working head 5 connected to the front end of the passive impact block 43, the working head 5 is exposed outside the housing 1, and the working head 5 is matched with a nut, a screw or a clamp to apply rotary and intermittent impact motion to a workpiece, so that the nut, the screw or the clamp can be assembled or disassembled.

The first intermediate shaft 41a and the second intermediate shaft 41b are connected in a longitudinally movable manner, and specifically, the first intermediate shaft 41a and the second intermediate shaft 41b are sleeved in shaft holes and are in clearance fit. Either a receiving bore is formed in the first intermediate shaft 41a for receiving the second intermediate shaft 41b or a receiving bore is formed in the second intermediate shaft 41b for receiving the first intermediate shaft 41a, with the bores being in a clearance fit to allow relative movement therebetween in the longitudinal direction.

Referring to fig. 3 and 4, in the present embodiment, the first intermediate shaft 41a is provided with a receiving hole 411 formed by being recessed inward from a longitudinal front end surface, and a longitudinal rear end of the second intermediate shaft 41b is received in the receiving hole 411 with a clearance fit with the receiving hole 411.

In addition, the first intermediate shaft 41a is provided with a through hole 413 which is located on the side wall and communicated with the receiving hole, the through hole 413 is a waist-shaped hole extending along the longitudinal direction, the intermediate shaft further comprises a connecting piece 45, and the connecting piece 45 penetrates through the through hole 413 and slides in the through hole 413 along the longitudinal direction. During normal use, the passive impact block 43 is not pushed backwards, the connecting piece 45 is positioned at the front end of the through hole 413 adjacent to the working head 5 due to the elasticity of the elastic piece 44, and the active impact block 42 impacts the passive impact block 43 back and forth in a normal range. When the working head 5 encounters large resistance, that is, when a nut, a screw or a clamp and other workpieces are difficult to pull, the passive impact block 43 receives instant backward thrust, so that the second intermediate shaft 41b moves backward relative to the first intermediate shaft 41a, the connecting piece 45 moves to the rear end of the through hole 413, the compression amount of the elastic piece 44 is instantly increased, the output torque force is instantly increased, the striking frequency of the active striking block is increased, and large torque force is output in a short time.

With continued reference to fig. 3 and 4, further, the first intermediate shaft 41a is symmetrically provided with two through holes 413 along the radial direction, the second intermediate shaft 41b is provided with a mounting hole extending along the radial direction perpendicular to the longitudinal direction, the connecting member 45 is a pin, the pin is tightly fitted with the mounting hole, and the pin is inserted into the through hole 413 and can slide in the through hole 413 along the longitudinal direction. The pin is arranged in the mounting hole of the second intermediate shaft 41b in a pressing manner, and the head and tail ends are exposed along the radial direction of the second intermediate shaft 41b, and respectively penetrate through the two through holes 413 of the first intermediate shaft 41a, so that the second intermediate shaft 41b and the first intermediate shaft 41a are movably connected along the longitudinal direction.

The elastic member 44 is a pressure spring, the pressure spring includes two ends protruding along the longitudinal direction, the pressure spring is sleeved on the periphery of the intermediate shaft, one end of the pressure spring abuts against the active impact block 42, and the other end of the pressure spring abuts against the gear reduction mechanism 3. The compression spring is placed between the active impact block 42 and the gear reduction mechanism 3 in a naturally telescopic state, and when the working head 5 of the impact wrench 100 meets resistance, the active impact block 42 is actively retracted to drive the compression spring to compress towards the gear reduction mechanism 3 to accumulate potential energy.

The driving impact block 42 is sleeved on the second intermediate shaft 41b, and is provided with an open slot 421 facing the motor 2, and a ball 46 and a washer 47 accommodated in the open slot 421, the washer 47 covers the ball 46, the elastic member 44 is partially received in the open slot 421, and one end of the elastic member abuts against the washer 47. The balls 46 are arranged to buffer the impact of the compression spring on the active impact block 42 from damage, and the washers 47 provide a flat surface for supporting the compression spring.

The gear reduction mechanism 3 comprises a planet carrier 31, the planet carrier 31 and the first intermediate shaft 41a are integrally arranged, the planet carrier 31 is provided with a step surface 311 which is transited to the first intermediate shaft 41a, and the other end of the pressure spring, which is adjacent to the gear reduction mechanism 3, is pressed against the step surface 311. The first intermediate shaft 41a may also be regarded as an output shaft of the gear reduction mechanism 3, which is provided integrally with the carrier 31, and the provision of the step surface 311 facilitates positioning of the end portions of the pressure spring.

With continued reference to fig. 3, the second intermediate shaft 41b has an outer periphery, the active impact block 42 has an inner wall, the impact mechanism further includes a steel ball 48 disposed between the outer periphery of the second intermediate shaft 41b and the inner wall of the active impact block 42, the second intermediate shaft 41b is provided with a receiving groove on the outer periphery, and the steel ball 48 is received in the rolling groove 431 and the receiving groove. The steel ball 48 converts the rotational motion of the active impact block 42 partially into a back and forth motion in the longitudinal direction.

The casing 1 includes the motor casing of accomodating the motor and connects in the gear box cover 13 of the longitudinal front end of motor casing, gear box cover 13 accepts gear reduction mechanism 3 with impact mechanism, still be equipped with the circumference in the gear box cover 13 and support the axle sleeve 7 of passive impact piece 3 and locate the buffer ring 8 between axle sleeve 7 and the passive impact piece 43, in addition, still be equipped with in the gear box cover 13 and be used for being fixed in the locating ring 6 in the gear box cover 13 with axle sleeve 7 to and be located and be used for alleviating the rubber ring 9 that strikes between axle sleeve 7 and the gear box cover 13.

To sum up, the utility model discloses the impact wrench 100 that preferred embodiment provided makes elastic component 44 can reach the maximum compression volume sooner because of the special design of jackshaft to reach the torsion nominal value that can pull nut, screw or anchor clamps sooner, improved impact wrench's efficiency, promoted user's operation experience.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many alternatives to the impact wrench are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An impact wrench, comprising: the impact mechanism comprises an intermediate shaft connected to the gear reduction mechanism, an active impact block driven by the intermediate shaft to rotate, a passive impact block meshed with the active impact block and an elastic piece arranged between the gear reduction mechanism and the active impact block, wherein the passive impact block is sleeved on the periphery of the intermediate shaft; the method is characterized in that: the intermediate shaft includes a first intermediate shaft and a second intermediate shaft that are circumferentially fixed to each other, the first intermediate shaft being connected to a front end of the gear reduction mechanism, the second intermediate shaft being connected to the active impact block and being provided so as to be capable of moving in a longitudinal direction with respect to the first intermediate shaft.

2. The impact wrench of claim 1, wherein: the first intermediate shaft is provided with a receiving hole which is inwards recessed from the longitudinal front end surface, and the longitudinal rear end of the second intermediate shaft is contained in the receiving hole and is in clearance fit with the receiving hole.

3. The impact wrench of claim 2, wherein: the first intermediate shaft is provided with a through hole which is positioned on the side wall and communicated with the receiving hole, the through hole is a waist-shaped hole extending along the longitudinal direction, the intermediate shaft further comprises a connecting piece, and the connecting piece penetrates through the through hole and slides along the longitudinal direction in the through hole.

4. The impact wrench of claim 3, wherein: the first intermediate shaft is symmetrically provided with two through holes along the radial direction, the second intermediate shaft is provided with a mounting hole which extends along the radial direction perpendicular to the longitudinal direction, the connecting piece is a pin, the pin is tightly matched with the mounting hole, and the pin penetrates through the through holes and slides along the longitudinal direction in the through holes.

5. The impact wrench of claim 1, wherein: the elastic piece is extended in a protruding mode along the longitudinal direction, one end of the elastic piece abuts against the active impact block, and the other end of the elastic piece abuts against the gear speed reducing mechanism.

6. The impact wrench of claim 5, wherein: the active impact block is sleeved on the second intermediate shaft and provided with an open slot facing the motor, and a ball and a gasket accommodated in the open slot, the gasket covers the ball, the elastic part is partially received in the open slot, and one end of the elastic part is pressed against the gasket.

7. The impact wrench of claim 6, wherein: the gear reduction mechanism comprises a planet carrier which is integrally arranged with the first intermediate shaft, the planet carrier is provided with a step surface which is transited to the first intermediate shaft, and the other end of the elastic part is pressed against the step surface.

8. The impact wrench of claim 1, wherein: the impact mechanism further comprises a steel ball arranged between the periphery of the second intermediate shaft and the inner wall of the active impact block, the second intermediate shaft is provided with a rolling groove located on the periphery, the active impact block is provided with an accommodating groove located on the inner wall, and the steel ball is accommodated in the rolling groove and the accommodating groove at the same time.

9. The impact wrench of claim 1, wherein: the impact mechanism further comprises a working head connected to the front end of the passive impact block, and the working head is exposed out of the shell.

10. The impact wrench of claim 9, wherein: the motor casing comprises a motor casing for accommodating the motor and a reduction gearbox sleeve connected to the longitudinal front end of the motor casing, the reduction gearbox sleeve accommodates the gear reduction mechanism and the impact mechanism, and the reduction gearbox sleeve is provided with a shaft sleeve for circumferentially supporting the passive impact block and a buffer ring arranged between the shaft sleeve and the passive impact block.