阅读说明：本技术 电锤扭矩调节装置 (Electric hammer torque adjusting device ) 是由 候维平 于 2020-12-30 设计创作，主要内容包括：一种电锤扭矩调节装置,包括气缸及套设于气缸上的离合套筒、传动齿轮及调节套筒,所述离合套筒随气缸共同旋转且设有螺纹部及第一卡合部,所述传动齿轮设有第二卡合部,所述第二卡合部啮合于第一卡合部,以使传动齿轮接合于离合套筒,此时所述第二卡合部与第一卡合部之间具有接合力,所述气缸堵转且离合力矩大于接合力时,所述传动齿轮与离合套筒脱离。所述调节套筒螺纹连接于螺纹部,且所述离合套筒随着调节套筒的旋转调节而在气缸的轴向上移动,以调节离合套筒的第一卡合部与传动齿轮的第二卡合部的接触深度来调节接合力的大小,从而实现最大离合力矩的自由调节。(The utility model provides an electric hammer torque adjusting device, includes cylinder and the clutch sleeve, drive gear and the adjusting sleeve of cover on the cylinder, clutch sleeve rotates and is equipped with screw thread portion and first block portion along with the cylinder jointly, drive gear is equipped with second block portion, second block portion meshing in first block portion to make drive gear joint in clutch sleeve, at this moment have engaging power between second block portion and the first block portion, when the cylinder is stifled to change and separation and reunion moment is greater than the engaging power, drive gear and clutch sleeve break away from. The adjusting sleeve is in threaded connection with the threaded portion, the clutch sleeve moves in the axial direction of the cylinder along with rotation adjustment of the adjusting sleeve, the contact depth of the first clamping portion of the clutch sleeve and the second clamping portion of the transmission gear is adjusted to adjust the size of the engaging force, and therefore free adjustment of the maximum engaging torque is achieved.)

1. An electric hammer torque adjusting device comprises an air cylinder arranged along the axial direction, a clutch sleeve, a transmission gear and an elastic piece, wherein the clutch sleeve, the transmission gear and the elastic piece are sleeved on the air cylinder, the clutch sleeve rotates together with the cylinder and is provided with a first clamping part positioned at the rear end, the transmission gear is positioned at the rear side of the clutch sleeve and is provided with a second clamping part positioned at the front end face, the second clamping part is meshed with the first clamping part, so that the transmission gear is jointed with the clutch sleeve, the front end of the elastic piece is abutted against the rear end surface of the transmission gear, and the rear end of the elastic piece is abutted against the cylinder, when the transmission gear is jointed with the clutch sleeve, the second clamping part and the first clamping part have joint force, when the cylinder is locked and the clutch torque of the cylinder is larger than the engaging force, the transmission gear is separated from the clutch sleeve; the method is characterized in that: the electric hammer torque adjusting device comprises an adjusting sleeve sleeved on the cylinder, the clutch sleeve is provided with a threaded portion located at the front end, the adjusting sleeve is in threaded connection with the threaded portion, and the clutch sleeve moves in the axial direction of the cylinder along with rotation adjustment of the adjusting sleeve so as to change the engaging force between the transmission gear and the clutch sleeve.

2. The electric hammer torque adjusting device according to claim 1, wherein: the clutch sleeve, the transmission gear and the cylinder have the same rotation axis, the cylinder is provided with an annular step part protruding outwards from the outer peripheral wall, the step part is axially located between the clutch sleeve and the transmission gear, the elastic piece pushes the transmission gear forwards to abut against the rear end face of the step part, the clutch sleeve adjusts the contact depth of the first clamping part and the second clamping part through the rotation of the adjusting sleeve, and therefore the engaging force between the transmission gear and the clutch sleeve is adjusted.

3. The electric hammer torque adjusting device according to claim 2, wherein: the second clamping part is provided with a plurality of grooves which are inwards sunken from the front end face of the transmission gear and limiting parts which are positioned between the grooves, the distance from the circle center of the transmission gear to the limiting parts of the second clamping part is larger than the radius of the step part, and the elastic part forwards supports and pushes the transmission gear until the step part supports against the inner wall face of the groove of the transmission gear.

4. The electric hammer torque adjusting device according to claim 3, wherein: the clutch sleeve is provided with an annular peripheral wall portion located at the rear end, the first clamping portion is provided with a plurality of protrusions protruding backwards from the annular peripheral wall portion, the protrusions are evenly distributed on the rear end face of the annular peripheral wall portion along the circumferential direction, and the distance from the circle center of the clutch sleeve to the protrusions is larger than the radius of the step portion, so that the protrusions of the first clamping portion cross the step portion and are inserted into the grooves of the second clamping portion.

5. The electric hammer torque adjusting apparatus according to claim 4, wherein: the clutch sleeve moves in the axial direction of the cylinder along with the rotation adjustment of the adjusting sleeve and has a natural tripping position located at the foremost end and a full engagement position located at the rearmost end, and in the process of the clutch sleeve from the natural tripping position to the full engagement position, the first clamping portion is changed from the second clamping portion which is not engaged to the second clamping portion which is fully engaged, and the engagement force between the second clamping portion and the first clamping portion is increased from zero to the maximum value.

6. The electric hammer torque adjusting device according to claim 5, wherein: when the clutch sleeve is in a natural tripping position, the first clamping part of the clutch sleeve is positioned in front of the second clamping part of the transmission gear, the first clamping part and the second clamping part are not meshed, and at the moment, the transmission gear and the clutch sleeve are in a tripping state and the engaging force between the transmission gear and the clutch sleeve is zero.

7. The electric hammer torque adjusting device according to claim 5, wherein: when the clutch sleeve is in a complete engagement position, the bulge of the first engagement part abuts against the inner wall surface of the groove of the second engagement part, and at the moment, the engagement force between the transmission gear and the clutch sleeve reaches a maximum value.

8. The electric hammer torque adjusting device according to claim 1, wherein: the adjusting sleeve is provided with an operating part located at the front end and an adjusting part located at the rear end, the adjusting part is provided with an internal thread located on the inner wall surface, the thread part is provided with an external thread located on the outer peripheral wall, and the internal thread is combined with the external thread so that the adjusting part of the adjusting sleeve is connected to the outer side of the thread part of the clutch sleeve.

9. The electric hammer torque adjusting device according to claim 1, wherein: the electric hammer torque adjusting device comprises a front stop part and a rear stop part, wherein the front stop part and the rear stop part protrude outwards from the outer peripheral wall of the air cylinder, the front stop part abuts against the front end face of the adjusting sleeve to limit the axial forward movement of the adjusting sleeve, the rear stop part is located at the rear end of the elastic piece, and the rear end of the elastic piece abuts against the front end face of the rear stop part.

10. The electric hammer torque adjusting device according to claim 9, wherein: the rear stop part comprises a pressing plate and a limiting part, the pressing plate and the limiting part are sleeved on the air cylinder, the rear end of the elastic part is abutted against the front end face of the pressing plate, the air cylinder is provided with an annular clamping groove which is inwards recessed from the outer peripheral wall, and the limiting part is a steel wire check ring or a C-shaped clamping ring which is partially accommodated in the clamping groove and abutted against the rear end face of the pressing plate so as to limit the axial rearward movement of the pressing plate.

[ technical field ]

The invention relates to the field of electric hammers, in particular to an electric hammer torque adjusting device.

[ background art ]

The structural characteristics and the operation particularity of the electric hammer enable the electric hammer to be widely applied to the fields of construction, construction and the like, and the electric hammer is deeply popular with the majority of users. In the practical application process, due to the instability of the use environment, the load is continuously changed suddenly, the overload or the locked rotor of the electric hammer is often caused, and the personal injury accident is easily caused by the reaction force generated during the overload or the locked rotor. The existing electric hammer is generally provided with a safety clutch mechanism, and aims to prevent people from being injured when the electric hammer punches to touch a steel bar and a drill bit is blocked. However, in the existing safety clutch mechanisms, the clutch torque is fixed, is set when the safety clutch mechanisms are shipped from a factory, and cannot be adjusted in use. However, this causes a problem that in some application environments, the drill bit of the electric hammer is collided with the steel bar to trigger the clutch, and the drill bit cannot go forward any more, but at this time, due to space problems, a user must drill holes at the drill bit and cannot replace the drill bit with another drill hole. This causes great difficulty for users, and at this time, only one electric hammer with larger clutch torque can be replaced to continue drilling so as to break through the reinforcing steel bar, so that the users need to prepare a plurality of electric hammers with different clutch torques during construction, and the construction becomes very troublesome.

Accordingly, there is a need for an improved electric hammer torque adjustment device that overcomes the deficiencies of the prior art.

[ summary of the invention ]

Aiming at the defects of the prior art, the invention aims to provide an electric hammer torque adjusting device for realizing free adjustment of clutch torque.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows: an electric hammer torque adjusting device comprises an air cylinder arranged along the axial direction, a clutch sleeve, a transmission gear and an elastic piece, wherein the clutch sleeve, the transmission gear and the elastic piece are sleeved on the air cylinder, the clutch sleeve rotates together with the cylinder and is provided with a first clamping part positioned at the rear end, the transmission gear is positioned at the rear side of the clutch sleeve and is provided with a second clamping part positioned at the front end face, the second clamping part is meshed with the first clamping part, so that the transmission gear is jointed with the clutch sleeve, the front end of the elastic piece is abutted against the rear end surface of the transmission gear, and the rear end of the elastic piece is abutted against the cylinder, when the transmission gear is jointed with the clutch sleeve, the second clamping part and the first clamping part have joint force, when the cylinder is locked and the clutch torque of the cylinder is larger than the engaging force, the transmission gear is separated from the clutch sleeve; the method is characterized in that: the electric hammer torque adjusting device comprises an adjusting sleeve sleeved on the cylinder, the clutch sleeve is provided with a threaded portion located at the front end, the adjusting sleeve is in threaded connection with the threaded portion, and the clutch sleeve moves in the axial direction of the cylinder along with rotation adjustment of the adjusting sleeve so as to change the engaging force between the transmission gear and the clutch sleeve.

The further improvement scheme is as follows: the clutch sleeve, the transmission gear and the cylinder have the same rotation axis, the cylinder is provided with an annular step part protruding outwards from the outer peripheral wall, the step part is axially located between the clutch sleeve and the transmission gear, the elastic piece pushes the transmission gear forwards to abut against the rear end face of the step part, the clutch sleeve adjusts the contact depth of the first clamping part and the second clamping part through the rotation of the adjusting sleeve, and therefore the engaging force between the transmission gear and the clutch sleeve is adjusted.

The further improvement scheme is as follows: the second clamping part is provided with a plurality of grooves which are inwards sunken from the front end face of the transmission gear and limiting parts which are positioned between the grooves, the distance from the circle center of the transmission gear to the limiting parts of the second clamping part is larger than the radius of the step part, and the elastic part forwards supports and pushes the transmission gear until the step part supports against the inner wall face of the groove of the transmission gear.

The further improvement scheme is as follows: the clutch sleeve is provided with an annular peripheral wall portion located at the rear end, the first clamping portion is provided with a plurality of protrusions protruding backwards from the annular peripheral wall portion, the protrusions are evenly distributed on the rear end face of the annular peripheral wall portion along the circumferential direction, and the distance from the circle center of the clutch sleeve to the protrusions is larger than the radius of the step portion, so that the protrusions of the first clamping portion cross the step portion and are inserted into the grooves of the second clamping portion.

The further improvement scheme is as follows: the clutch sleeve moves in the axial direction of the cylinder along with the rotation adjustment of the adjusting sleeve and has a natural tripping position located at the foremost end and a full engagement position located at the rearmost end, and in the process of the clutch sleeve from the natural tripping position to the full engagement position, the first clamping portion is changed from the second clamping portion which is not engaged to the second clamping portion which is fully engaged, and the engagement force between the second clamping portion and the first clamping portion is increased from zero to the maximum value.

The further improvement scheme is as follows: when the clutch sleeve is in a natural tripping position, the first clamping part of the clutch sleeve is positioned in front of the second clamping part of the transmission gear, the first clamping part and the second clamping part are not meshed, and at the moment, the transmission gear and the clutch sleeve are in a tripping state and the engaging force between the transmission gear and the clutch sleeve is zero.

The further improvement scheme is as follows: when the clutch sleeve is in a complete engagement position, the bulge of the first engagement part abuts against the inner wall surface of the groove of the second engagement part, and at the moment, the engagement force between the transmission gear and the clutch sleeve reaches a maximum value.

The further improvement scheme is as follows: the adjusting sleeve is provided with an operating part located at the front end and an adjusting part located at the rear end, the adjusting part is provided with an internal thread located on the inner wall surface, the thread part is provided with an external thread located on the outer peripheral wall, and the internal thread is combined with the external thread so that the adjusting part of the adjusting sleeve is connected to the outer side of the thread part of the clutch sleeve.

The further improvement scheme is as follows: the electric hammer torque adjusting device comprises a front stop part and a rear stop part, wherein the front stop part and the rear stop part protrude outwards from the outer peripheral wall of the air cylinder, the front stop part abuts against the front end face of the adjusting sleeve to limit the axial forward movement of the adjusting sleeve, the rear stop part is located at the rear end of the elastic piece, and the rear end of the elastic piece abuts against the front end face of the rear stop part.

The further improvement scheme is as follows: the rear stop part comprises a pressing plate and a limiting part, the pressing plate and the limiting part are sleeved on the air cylinder, the rear end of the elastic part is abutted against the front end face of the pressing plate, the air cylinder is provided with an annular clamping groove which is inwards recessed from the outer peripheral wall, and the limiting part is a steel wire check ring or a C-shaped clamping ring which is partially accommodated in the clamping groove and abutted against the rear end face of the pressing plate so as to limit the axial rearward movement of the pressing plate.

Compared with the prior art, the invention has the following beneficial effects: the electric hammer torque adjusting device comprises an adjusting sleeve sleeved on the air cylinder, the clutch sleeve is provided with a threaded part positioned at the front end, the adjusting sleeve is in threaded connection with the threaded part, and the clutch sleeve moves in the axial direction of the air cylinder along with the rotation adjustment of the adjusting sleeve so as to change the engaging force between the transmission gear and the clutch sleeve; the axial position of the clutch sleeve on the cylinder is adjusted by utilizing the threads, so that the engaging force can be adjusted at any time when the electric hammer is in use, and the maximum clutch torque of the electric hammer in the locked-rotor process can be freely adjusted. The clutch sleeve is provided with a natural tripping position and a full engagement position, the first clamping part is changed from the non-engagement second clamping part to full engagement in the process of the clutch sleeve from the natural tripping position to the full engagement position, and the engagement force between the second clamping part and the first clamping part is increased from zero to a maximum value; the size of the engaging force is adjusted by adjusting the contact depth of the first clamping part of the clutch sleeve and the second clamping part of the transmission gear, so that the free adjustment of the maximum clutch torque is realized, and the problem that a user cannot increase the clutch torque to break a steel bar when a single electric hammer is used is solved.

[ description of the drawings ]

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

FIG. 1 is a cross-sectional view of an electric hammer in accordance with a preferred embodiment of the present invention;

fig. 2 is a partial cross-sectional view of the clutch sleeve of the electric hammer shown in fig. 1 in a naturally tripped position;

FIG. 3 is a partial cross-sectional view of the clutch sleeve of the hammer shown in FIG. 1 in a fully engaged position;

fig. 4 is a perspective view of the electric hammer torque adjusting device in the electric hammer shown in fig. 1;

FIG. 5 is a front view of the electric hammer torque adjustment device shown in FIG. 4;

fig. 6 is a perspective view of a clutch sleeve in the electric hammer torque adjusting apparatus shown in fig. 4;

fig. 7 is a perspective view of a transmission gear in the electric hammer torque adjusting apparatus shown in fig. 4;

fig. 8 is a partially enlarged view of the electric hammer torque adjusting apparatus shown in fig. 1.

The meaning of the reference symbols in the figures:

100. the electric hammer torque adjusting device 10, the cylinder 11, the front stop portion 12, the rear stop portion 121, the pressure plate 122, the limit member 13, the key groove 14, the step portion 15, the piston 16, the impact block 20, the clutch sleeve 21, the threaded portion 22, the first engaging portion 221, the protrusion 222, the limit groove 23, the annular peripheral wall portion 24, the pin key 30, the transmission gear 31, the second engaging portion 32, the groove 33, the limit portion 40, the elastic member 50, the adjusting sleeve 51, the operating portion 52, the adjusting portion 53, the bearing 200, the electric hammer 201, the housing 202, the motor 203, the intermediate shaft 204, the swing rod bearing, the electric hammer torque adjusting device

[ detailed description of the invention ]

Referring to fig. 1 to 3, the present invention discloses an electric hammer 200, which is widely applied to the fields of construction and construction. The electric hammer 200 comprises a housing 201, and a motor 202, an intermediate shaft 203 and an electric hammer torque adjusting device 100 which are positioned in the housing 201, wherein the motor 202 and the intermediate shaft 203 are arranged along an axial direction and are both supported in the housing 201 by two bearings. The front end of the motor 201 is engaged with the rear end of the intermediate shaft 203, and the intermediate shaft 203 is driven to rotate when the motor 202 rotates.

The front end of the intermediate shaft 203 is engaged with the transmission gear 30 of the electric hammer torque adjusting device 100, and when the electric hammer 200 works normally, the motor 202 drives the transmission gear 30 to rotate through the intermediate shaft 203 and drives the air cylinder 10 to rotate together. The electric hammer 100 further comprises a swing rod bearing 204 sleeved on the intermediate shaft 203, and a piston 15 and an impact block 16 which are located in the cylinder 10, wherein the swing rod bearing 204 is connected to the rear end of the piston 15, and the intermediate shaft 203 drives the piston 15 to make axial reciprocating motion in the cylinder 10 through the swing rod bearing 204 so as to drive the impact block 16 to make axial impact motion.

Referring to fig. 4 to 7, the electric hammer torque adjusting apparatus 100 is used for interrupting the output of the torque when the electric hammer 200 is overloaded or locked. The electric hammer torque adjusting device 100 comprises an air cylinder 10, a clutch sleeve 20, a transmission gear 30, an elastic part 40 and an adjusting sleeve 50, wherein the air cylinder 10 is axially arranged, the clutch sleeve 20, the transmission gear 30 and the adjusting sleeve 50 are sleeved on the air cylinder 10, and the clutch sleeve 20, the transmission gear 30 and the air cylinder 10 have the same rotation axis.

The cylinder 10 has a front stop portion 11, a rear stop portion 12 and an annular step portion 14 protruding outward from the outer peripheral wall thereof, and the step portion is located between the front stop portion 11 and the rear stop portion 12. The forward stopper 11 abuts against a front end surface of the adjustment sleeve 50 to restrict axial forward movement of the adjustment sleeve 50; the backstop 12 is located at the rear end of the elastic member 40, and the rear end of the elastic member 40 abuts against the front end face of the backstop 12. In the present embodiment, the cylinder 10 is provided with an annular groove (not numbered) recessed inward from the outer peripheral wall, and the front blocking portion 11 is a wire retainer ring or a C-shaped retainer ring partially accommodated in the groove and abuts against the front end surface of the operation portion 51 of the adjustment sleeve 50 to limit the axial forward movement of the adjustment sleeve 50. In other embodiments, the front stop portion 11 may be integrally formed on the outer circumferential wall of the cylinder 10 to achieve the same limiting function.

The backstop 12 includes a pressing plate 121 sleeved on the cylinder 10 and a limiting component 122, the rear end of the elastic component 40 abuts against the front end face of the pressing plate 121, the cylinder 10 is provided with an annular clamping groove (not numbered) which is recessed inwards from the outer peripheral wall, and the limiting component 122 is a steel wire retaining ring or a C-shaped clamping ring which is partially accommodated in the clamping groove and abuts against the rear end face of the pressing plate 121 so as to limit the axial backward movement of the pressing plate 121. Thus, the cylinder 10 presses and limits the adjusting sleeve 50, the clutch sleeve 20, the transmission gear 30 and the elastic member 40 to the outer peripheral wall of the cylinder 10 through the front stop portion 11 and the rear stop portion 12.

As shown in fig. 6, the clutch sleeve 20 is provided with a pin 24 protruding inward from an inner wall surface thereof, the cylinder 10 is provided with a key groove 13 on an outer peripheral wall thereof, the clutch sleeve 20 is connected to the cylinder 10 by the engagement of the pin 24 and the key groove 13 and rotates together with the cylinder 10, and the clutch sleeve 20 is movable in an axial direction relative to the cylinder 10. The clutch sleeve 20 is provided with a threaded portion 21 at the front end, a first engaging portion 22 and an annular peripheral wall portion 23 at the rear end, the first engaging portion 22 is provided with a plurality of protrusions 221 protruding backwards from the annular peripheral wall portion 23 and limiting grooves 222 located between the protrusions 221, the protrusions 221 are uniformly arranged on the rear end face of the annular peripheral wall portion 23 along the circumferential direction, and the protrusions 221 and the limiting grooves 222 are arranged at intervals in the circumferential direction.

As shown in fig. 7, the transmission gear 30 is located on the rear side of the clutch sleeve 20 and is provided with a second engaging portion 31 located on the front end surface, and the second engaging portion 31 is engaged with the first engaging portion 22 to engage the transmission gear 30 with the clutch sleeve 20. The second engaging portion 31 is provided with a plurality of grooves 32 recessed inward from the front end surface of the transmission gear 30 and a limiting portion 33 located between the grooves 32, the plurality of grooves 32 are uniformly arranged on the front end surface of the transmission gear 30 along the circumferential direction, and the plurality of grooves 32 and the limiting portion 33 are arranged at intervals in the circumferential direction. An inclined guide surface (not numbered) is formed between the groove 32 and the limiting portion 33, and the inclined guide surface extends from the top of the limiting portion 33 to the inner wall surface of the groove 32 to facilitate engagement and disengagement of the first engaging portion 22 and the second engaging portion 31.

When the transmission gear 30 is engaged with the clutch sleeve 20, the protrusion 221 of the first engaging portion 22 is received in the groove 32 of the second engaging portion 31, and the position-limiting portion 33 of the second engaging portion 31 is received in the position-limiting groove 222 of the first engaging portion 22. In this embodiment, the elastic member 40 is a return spring, and a front end of the return spring abuts against a rear end surface of the transmission gear 30 and a rear end of the return spring abuts against the rear stop portion 12 of the cylinder 10 so as to push the transmission gear 30 forward. When the transmission gear 30 is engaged with the clutch sleeve 20, an engagement force is generated between the second engagement portion 31 and the first engagement portion 22; when the cylinder 10 is locked and the clutch torque of the cylinder 10 is greater than the engaging force, the transmission gear 30 is disengaged from the clutch sleeve 20, so that the output of the torque force is interrupted when the electric hammer 200 is overloaded or locked.

The adjusting sleeve 50 is provided with an operating part 51 at the front end and an adjusting part 52 at the rear end, and the operating part 51 is exposed outside the housing 201 so as to facilitate the rotating operation of the user. The adjusting portion 52 is provided at an outer periphery thereof with a bearing 53, and the bearing 53 is used for supporting the adjusting sleeve 50 in the housing 201. The adjusting portion 52 is provided with an internal thread on an inner wall surface thereof, and the screw portion 21 of the clutch sleeve 20 is provided with an external thread on an outer peripheral wall thereof, the internal thread and the external thread being combined so that the adjusting portion 52 of the adjusting sleeve 50 is coupled to an outside of the screw portion 21 of the clutch sleeve 20.

The adjusting portion 52 of the adjusting sleeve 50 is threadedly coupled to the threaded portion 21 of the clutch sleeve 20 so that the clutch sleeve 20 moves in the axial direction of the cylinder 10 as the adjusting sleeve 50 is rotationally adjusted, thereby changing the engagement force between the transmission gear 30 and the clutch sleeve 20. The axial position of the clutch sleeve 20 on the cylinder 10 is adjusted by using the screw thread, so that the engaging force of the electric hammer 200 can be adjusted at any time during use, that is, the maximum engaging torque of the electric hammer 200 during locked rotation can be freely adjusted, and the problem of single engaging torque of the electric hammer is solved.

Referring to fig. 8, the stepped portion 14 is located between the clutch sleeve 20 and the transmission gear 30 in the axial direction, and the elastic member 40 pushes the transmission gear 30 forward until the transmission gear 30 abuts against the rear end face of the stepped portion 14. The distance from the center of the transmission gear 30 to the limiting portion 33 of the second engaging portion 31 is greater than the radius of the stepped portion 14, that is, the elastic member 40 can push the transmission gear 30 forward until the stepped portion 14 abuts against the inner wall surface of the groove 32 of the transmission gear 30. Meanwhile, the distance from the center of the clutch sleeve 20 to the protrusion 221 is greater than the radius of the step 14, so that the protrusion 221 of the first engaging portion 22 can be inserted into the groove 32 of the second engaging portion 31 across the step 14.

As the adjustment sleeve 50 is rotationally adjusted, the clutch sleeve 20 moves in the axial direction of the cylinder 10; according to the position change of the clutch sleeve 20 in the axial direction of the cylinder 10, the contact depth of the protrusion 221 of the first engaging part 22 inserted into the groove 32 of the second engaging part 31 is adjusted, so that the engaging force between the two is adjusted. That is, the clutch sleeve 20 has a natural trip position at the foremost end and a full engagement position at the rearmost end, and during the process of the clutch sleeve 20 from the natural trip position to the full engagement position, the first engaging portion 22 is changed from the unengaged second engaging portion 31 to the fully engaged second engaging portion 31, and the engagement force between the second engaging portion 31 and the first engaging portion 22 is also increased from zero to the maximum value.

The size of the engaging force is adjusted by adjusting the contact depth between the first engaging part 22 of the clutch sleeve 20 and the second engaging part 31 of the transmission gear 30, so that the free adjustment of the maximum engaging torque is realized, and the problem that a user cannot increase the engaging torque to break through a steel bar when a single electric hammer is used is solved. Specifically, referring to fig. 2, when the clutch sleeve 20 is in the natural trip position, the first engaging portion 22 of the clutch sleeve 20 is located in front of the second engaging portion 31 of the transmission gear 30, and the transmission gear 30 and the clutch sleeve 20 are not engaged with each other, and at this time, the transmission gear 30 and the clutch sleeve 20 are in the trip state, and the engaging force between the transmission gear and the clutch sleeve 20 is zero. As shown in fig. 3, when the clutch sleeve 20 is in the fully engaged position, the protrusion 221 of the first engaging portion 22 abuts against the inner wall surface of the recess 32 of the second engaging portion 31, and at this time, the engaging force between the transmission gear 30 and the clutch sleeve 20 reaches the maximum value.

In the present invention, the electric hammer torque adjusting device 100 includes an adjusting sleeve 50 sleeved on the cylinder 10, the clutch sleeve 20 is provided with a threaded portion 21 at the front end, the adjusting sleeve 50 is threadedly connected to the threaded portion 21, and the clutch sleeve 20 moves in the axial direction of the cylinder 10 along with the rotation adjustment of the adjusting sleeve 50 to change the engaging force between the transmission gear 30 and the clutch sleeve 20; the axial position of the clutch sleeve 20 on the cylinder 10 is adjusted by using the screw thread, so that the engaging force of the electric hammer 200 can be adjusted at any time during use, that is, the maximum engaging torque of the electric hammer 200 during locked rotation can be freely adjusted. The clutch sleeve 20 has a natural tripping position and a full engagement position, in the process of the clutch sleeve 20 from the natural tripping position to the full engagement position, the first clamping part 22 is changed from the non-engagement second clamping part 31 to the full-engagement second clamping part 31, and the engagement force between the second clamping part 31 and the first clamping part 22 is also increased from zero to a maximum value; the size of the engaging force is adjusted by adjusting the contact depth of the first engaging part 22 of the clutch sleeve 20 and the second engaging part 31 of the transmission gear 30, so that the free adjustment of the maximum engaging torque is realized, and the problem that a user cannot increase the engaging torque to break through a steel bar when a single electric hammer is used is solved.

The present invention is not limited to the above-described embodiments. Those skilled in the art will readily appreciate that there are numerous alternatives to the hammer torque adjustment apparatus of the present invention without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.