CN217669222U

CN217669222U - Electric hammer gear adjusting device

Info

Publication number: CN217669222U
Application number: CN202221044713.4U
Authority: CN
Inventors: 陈果; 黄再祥
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-10-28
Anticipated expiration: 2032-04-29

Abstract

The utility model provides an electric hammer gear adjusting device, includes along the cylinder of axial setting, is located piston and the impact block of cylinder and cover drive gear and the clutch assembly who locates on the cylinder. An air cavity is formed among the air cylinder, the piston and the impact block, the transmission gear drives the air cylinder to rotate together through the clutch assembly, and the clutch assembly comprises a clutch sleeve connected to the transmission gear. The cylinder is provided with an exhaust hole which penetrates through the outer wall of the cylinder and is communicated with the air cavity, the clutch sleeve is provided with a rear peripheral wall portion which is attached to the outer wall of the cylinder and a through hole which penetrates through the rear peripheral wall portion, and the clutch sleeve moves along the axial direction and is provided with a heavy hammer gear and a light hammer gear. When the clutch sleeve is positioned at a gear of the heavy hammer, the inner wall surface of the rear peripheral wall part is attached to the exhaust hole, and the electric hammer performs hammering at a normal speed; when the clutch sleeve is positioned at a light hammer gear, the through hole of the clutch sleeve is communicated with the exhaust hole of the cylinder, and partial gas in the gas cavity is exhausted outwards, so that the effect of reducing hammering is achieved.

Description

Electric hammer gear adjusting device

[ technical field ]

The utility model relates to a hammer pick class electric tool field, in particular to electric hammer gear adjusting device for electric hammer.

[ background Art ]

The hammer-pick electric tools (such as electric hammers, electric picks and the like) are used as electric tools, and the hammer-pick electric tools utilize the piston motion principle to compress gas to impact a drill bit to realize hammering and chiseling functions; the hole-forming machine does not need the strength of a user, can form holes in hard materials such as concrete, bricks and stones, and is popular with the user. At present, the electric hammer on the market is added with a light hammer function and is used for chiseling light working occasions such as softer geology and wood boards, and the like, so that the requirements of customers on various working occasions are met. In order to realize the light hammer function, the duty ratio of a circuit board is required to be adjusted to reduce the output power, so that the hammering energy is reduced to realize the light hammer function; however, it reduces the rotational speed of the output shaft while reducing the hammering energy, sacrificing work efficiency.

Accordingly, there is a need for an improved gear adjustment device for an electric hammer to overcome the drawbacks of the prior art.

[ contents of utility model ]

Not enough to prior art, the utility model aims to provide an electric hammer gear adjusting device with gently hammer the gear, its user demand who satisfies multiple work occasion when not influencing the performance.

The utility model provides a technical scheme that prior art problem adopted is: the electric hammer gear adjusting device comprises an air cylinder arranged along the axial direction, a piston and an impact block positioned in the air cylinder, and a transmission gear and a clutch assembly sleeved on the air cylinder. The piston makes axial reciprocating motion in the cylinder to drive the impact block to make axial impact motion, an air cavity is formed among the cylinder, the piston and the impact block, the transmission gear drives the cylinder to rotate together through the clutch assembly, and the clutch assembly comprises a clutch sleeve connected to the transmission gear. The cylinder is provided with exhaust holes which penetrate through the outer wall of the cylinder and are communicated with the air cavity, the clutch sleeve is provided with a rear peripheral wall part which is attached to the outer wall of the cylinder and a through hole which penetrates through the rear peripheral wall part, the clutch sleeve moves axially and is provided with a heavy hammer gear and a light hammer gear, when the clutch sleeve is positioned at the heavy hammer gear, the inner wall surface of the rear peripheral wall part is attached to the exhaust holes, when the clutch sleeve is positioned at the light hammer gear, the through hole of the clutch sleeve is communicated with the exhaust holes of the cylinder.

The further improvement scheme is as follows: the clutch sleeve is located in front of the transmission gear, the clutch sleeve is provided with a first clamping portion located at the rear end of the rear peripheral wall portion, the transmission gear is provided with a second clamping portion located at the front end, and the second clamping portion is jointed with the first clamping portion so that the clutch sleeve rotates together with the transmission gear.

The further improvement scheme is as follows: the clutch sleeve is further provided with a pure hammering gear, the second clamping portion and the first clamping portion are separated from each other at the moment, and the transmission gear cannot drive the clutch sleeve to rotate.

The further improvement scheme is as follows: the clutch sleeve is provided with a front peripheral wall portion located at the front end of the rear peripheral wall portion and a step portion connecting the front peripheral wall portion and the rear peripheral wall portion, the radius of the front peripheral wall portion is larger than that of the rear peripheral wall portion, and an accommodating portion is formed between the inner wall of the front peripheral wall portion and the outer wall of the cylinder.

The further improvement scheme is as follows: the clutch assembly comprises a stopping part, an elastic piece and a clutch piece, wherein the stopping part, the elastic piece and the clutch piece are accommodated in the accommodating part, the stopping part is fixedly held on the inner wall of the front peripheral wall part, and the elastic piece is positioned between the stopping part and the clutch piece so as to enable the clutch piece to abut against the step part of the clutch sleeve.

The further improvement scheme is as follows: the stop part comprises a pressing plate and a limiting part, the pressing plate and the limiting part are sleeved on the air cylinder, the front end of the elastic part abuts against the rear end face of the pressing plate, the clutch sleeve is provided with an annular clamping groove which is recessed from the inner wall of the front peripheral wall part, 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 abuts against the front end face of the pressing plate so as to limit the axial forward movement of the pressing plate.

The further improvement scheme is as follows: the clutch piece is provided with an annular part sleeved on the periphery of the cylinder and a pin key protruding inwards from the inner wall surface of the annular part, the cylinder is provided with a key groove located on the outer wall, the pin key is connected in the key groove in a sliding mode along the axial direction, and the clutch piece moves along the axial direction relative to the cylinder and rotates together with the cylinder.

The further improvement scheme is as follows: the clutch piece is provided with a bulge protruding from the annular part towards the step part, the clutch sleeve is provided with a groove which is positioned on the inner wall of the step part and is clamped with the bulge, when the clutch piece is jointed with the clutch sleeve, the bulge and the groove have engaging force, and the clutch piece moves along with the clutch sleeve in the axial direction to change the engaging force between the clutch piece and the clutch sleeve.

The further improvement scheme is as follows: the first clamping part of the clutch sleeve is jointed with the second clamping part of the transmission gear, and the transmission gear drives the cylinder to rotate together through the clutch component; when the cylinder is locked and the clutch torque of the cylinder is larger than the engaging force, the clutch piece is separated from the clutch sleeve.

The further improvement scheme is as follows: when the first clamping part of the clutch sleeve is completely jointed with the second clamping part of the transmission gear, the joint force between the clutch piece and the clutch sleeve reaches the minimum value; when the first clamping part of the clutch sleeve is not jointed with the second clamping part of the transmission gear, the joint force between the clutch piece and the clutch sleeve reaches the maximum value.

Compared with the prior art, the utility model discloses following beneficial effect has: the cylinder is provided with an exhaust hole which penetrates through the outer wall of the cylinder and is communicated with the air cavity, the clutch sleeve is provided with a rear peripheral wall portion which is attached to the outer wall of the cylinder and a through hole which penetrates through the rear peripheral wall portion, and the clutch sleeve moves along the axial direction and is provided with a heavy hammer gear and a light hammer gear. When the clutch sleeve is positioned at a gear of the heavy hammer, the inner wall surface of the rear peripheral wall part is attached to the exhaust hole, the compressed gas in the gas cavity is not reduced, and the electric hammer performs hammering at a normal speed; when the clutch sleeve is positioned at a light hammer gear, the through hole of the clutch sleeve is communicated with the exhaust hole of the cylinder, part of compressed gas in the gas cavity is discharged outwards, and the hammering reduction effect is achieved by reducing the amount of the compressed gas in the gas cavity. The electric hammer gear adjusting device increases the gear of the light hammer without affecting the performance, is used for chiseling light working occasions such as soft geology and wood boards, and meets the requirements of customers on various working occasions.

[ description of the drawings ]

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

fig. 1 is a front view of an electric hammer according to a preferred embodiment of the present invention;

fig. 2 is a perspective view of the electric hammer shift position adjusting device in the electric hammer shown in fig. 1;

fig. 3 is an exploded schematic view of the electric hammer stage adjusting device shown in fig. 2;

fig. 4 is a sectional view of the electric hammer position adjusting device shown in fig. 2;

fig. 5 is a sectional view of the electric hammer stage adjusting device shown in fig. 2 in a light hammer stage.

The meaning of the reference symbols in the figures:

100. electric hammer gear adjusting device 10, air cylinder 11, air chamber 12, key groove 13, exhaust hole 20, transmission gear 21, second clamping part 30, piston 31, impact block 32, connecting rod 321, pin 40, clutch sleeve 41, rear peripheral wall part 42, front peripheral wall part 420, accommodating cavity 43, step part 44, first clamping part 45, through hole 50, clutch part 51, annular part 52, pin key 53, protrusion 60, elastic part 70, stop part 71, pressure plate 72, limiting part 80, adjusting knob 200, electric hammer 201, main body part 202, holding part 203, output part

[ 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 to 5, an electric hammer 200 according to a preferred embodiment of the present invention is widely applied to the fields of construction and construction. The electric hammer 200 comprises a main body 201, a holding part 202 connected to the rear end of the main body 201, and an output part 203 connected to the front end of the main body 201, wherein the holding part 202 is held by a user to operate the electric hammer 200, and the output part 203 is used for outputting the power of the electric hammer 200 outwards. The electric hammer 200 further includes a motor (not shown) disposed in the main body 201, an electric hammer torque adjusting device 100 connected to the motor, and an adjusting knob 80 disposed on the main body 201, wherein the adjusting knob 80 is used for performing corresponding gear adjustment and torque adjustment on the electric hammer torque adjusting device 100.

Referring to fig. 2, the electric hammer gear adjusting apparatus 100 includes an air cylinder 10 disposed along an axial direction, a transmission gear 20 and a clutch assembly (not numbered) sleeved on the air cylinder 10, and a piston 30 and an impact block 31 disposed in the air cylinder 10. The motor is meshed with the transmission gear 20, and when the electric hammer 200 works normally, the motor drives the clutch assembly to rotate through the transmission gear 20 and drives the cylinder 10 to rotate together. One end of the connecting rod 32 is fixedly connected to the piston 30 through a pin 321, and the other end is connected to a motor, and the motor drives the piston 30 to axially reciprocate in the cylinder 10 through the connecting rod 32, so as to drive the impact block 31 to axially impact. Meanwhile, an air cavity 11 is formed among the cylinder 10, the piston 30 and the impact block 31, and the cylinder 10 is provided with an exhaust hole 13 penetrating through the outer wall thereof and communicating with the air cavity 11.

Referring to fig. 3 to 5, the clutch assembly is used for interrupting the output of the torque when the electric hammer 200 is overloaded or locked. The clutch assembly includes a clutch sleeve 40 connected to the transmission gear 20, and a clutch member 50, an elastic member 60 and a stop portion 70 sleeved on the periphery of the cylinder 10, wherein the elastic member 60 is a return spring, and the clutch sleeve 40, the clutch member 50 and the cylinder 10 have the same rotation axis.

The clutch sleeve 40 is located in front of the transmission gear 20 and includes a rear peripheral wall 41 attached to an outer wall of the cylinder 10, a front peripheral wall 42 located at a front end of the rear peripheral wall 41, and a step 43 connecting the front peripheral wall 42 and the rear peripheral wall 41. The radius of the front peripheral wall 42 is larger than the radius of the rear peripheral wall 41, so that an accommodating portion 420 is formed between the inner wall of the front peripheral wall 42 and the outer wall of the cylinder 10, and the stopper portion 70, the elastic member 60, and the clutch member 50 are accommodated in the accommodating portion 420.

The clutch sleeve 40 is provided with a first engaging portion 44 located at the rear end of the rear peripheral wall portion 41 and a through hole 45 penetrating the rear peripheral wall portion 41; the transmission gear 20 is provided with a second engaging portion 21 at the front end, and the second engaging portion 21 is engaged with the first engaging portion 44 so that the clutch sleeve 40 rotates together with the transmission gear 20. Meanwhile, the clutch sleeve 40 moves in the axial direction and has a heavy hammer gear and a light hammer gear, when the clutch sleeve 40 is located at the heavy hammer gear, the inner wall surface of the rear peripheral wall portion 41 is fitted to the exhaust hole 13 of the cylinder 10, the compressed gas in the air cavity 11 is not reduced, and the electric hammer performs hammering at a normal speed. When the clutch sleeve 40 is located at a light hammer gear, the through hole 45 of the clutch sleeve 40 is communicated with the exhaust hole 13 of the cylinder 10, part of compressed gas in the gas cavity 11 is discharged outwards, and the hammering reduction effect is achieved by reducing the amount of the compressed gas in the gas cavity 11.

The stop portion 70 is fixed on the inner wall of the front peripheral wall 42, and the elastic element 60 is located between the stop portion 70 and the clutch member 50, so that the clutch member 50 abuts against the step portion 43 of the clutch sleeve 40. The stop part 70 comprises a pressure plate 71 and a limit part 72, which are sleeved on the cylinder 10, the front end of the elastic part 60 abuts against the rear end surface of the pressure plate 71, the clutch sleeve 40 is provided with an annular clamping groove (not numbered) recessed from the inner wall of the front peripheral wall part 42, and the limit part 72 is a steel wire retaining ring or a C-shaped clamp ring partially accommodated in the clamping groove and abuts against the front end surface of the pressure plate 71 to limit the axial forward movement of the pressure plate 71; thereby ensuring that the resilient member 60 and clutch 50 do not fall out of the receiving cavity 420.

The clutch 50 is provided with an annular portion 51 fitted around the outer periphery of the cylinder 10, a pin 52 projecting inward from the inner wall surface of the annular portion 51, and a projection 53 projecting from the annular portion 51 toward the step portion 43. The cylinder 10 is provided with a keyway 12 in its outer wall and the pin 52 is axially slidably engaged in the keyway 12 so that the clutch 50 is axially movable relative to the cylinder 10 and co-rotates with the cylinder 10. The clutch sleeve 40 is provided with a groove (not shown) which is positioned on the inner wall of the step part 43 and is used for clamping the protrusion 53, and when the clutch piece 50 is jointed with the clutch sleeve 40, the protrusion 53 and the groove have jointing force; at the same time, the clutch member 50 moves in the axial direction with the clutch sleeve 40 to change the engagement force between the clutch member 50 and the clutch sleeve 40.

Specifically, when the first engaging portion 44 of the clutch sleeve 40 is engaged with the second engaging portion 21 of the transmission gear 20, the transmission gear 20 can drive the cylinder 10 to rotate together through the clutch assembly. In this case, when the cylinder 10 is locked and the clutch torque of the cylinder 10 is greater than the engaging force, the clutch member 50 is disengaged from the clutch sleeve 40 to trip the gear, so that the output of the torque force is interrupted when the electric hammer 200 is overloaded or locked.

Meanwhile, the clutch sleeve 40 is further provided with an annular groove (not numbered) recessed inward from the inner wall surface of the rear peripheral wall portion 41, and the annular groove overlaps with the through hole 45 in the axial direction, that is, the through hole 45 communicates with the annular groove; when the clutch sleeve 40 is located at the light hammer gear, the exhaust hole 13 of the cylinder 10 is communicated with the through hole 45 and the annular groove. In this case, when the cylinder 10 is blocked to cause the clutch member 50 to trip, the cylinder 10 rotates relative to the clutch sleeve 40; at this time, even if the through hole 45 of the clutch sleeve 40 and the exhaust hole 13 of the cylinder 10 are circumferentially staggered, as long as the clutch sleeve 40 is located at the light hammer gear, the annular groove of the clutch sleeve 40 can ensure that the exhaust hole 13 of the cylinder 10 is always communicated with the through hole 45 of the clutch sleeve 40, so that the compressed gas in the air cavity 11 can be smoothly discharged outwards, and the effect of reducing hammering is achieved.

Further, the number of the through holes 45 of the clutch sleeve 40 is an integer multiple of the number of the protrusions 53 of the clutch member 50, so that when the cylinder 10 is blocked and the clutch member 50 is shifted, even if the cylinder 10 rotates relative to the clutch sleeve 40, the through holes 45 can still be aligned and communicated with the exhaust holes 13, so that the compressed gas in the air cavity 11 can be smoothly discharged outwards, and thus, the hammering reduction effect is achieved, and at this time, the clutch sleeve 40 does not need to be provided with the annular groove. In the present embodiment, the number of the through holes 45 of the clutch sleeve 40 is the same as the number of the protrusions 53 of the clutch member 50.

In this embodiment, the clutch sleeve 40 further has a pure hammer gear position, and at this time, the second engaging portion 21 and the first engaging portion 44 are separated from each other, so that the transmission gear 20 does not drive the clutch sleeve 40 to rotate, and the cylinder 10 only has an impact motion. When the first engaging portion 44 of the clutch sleeve 40 is completely engaged with the second engaging portion 21 of the transmission gear 20, the engaging force between the clutch 50 and the clutch sleeve 40 reaches a minimum value; the first engaging portion 44 of the clutch sleeve 40 is not engaged with the second engaging portion 21 of the transmission gear 20, that is, when the clutch sleeve 40 is located at the pure hammer position, the engaging force between the clutch member 50 and the clutch sleeve 40 reaches the maximum value.

The utility model discloses in, cylinder 10 is equipped with the exhaust hole 13 that runs through the outer wall of cylinder 10 and communicates air cavity 11, clutch sleeve 40 is equipped with the through-hole 45 that laminates in the back of the outer wall of cylinder 10 wall portion 41 and run through back wall portion 41, clutch sleeve 40 just has weight gear and light hammer gear along axial motion. When the clutch sleeve 40 is located at the gear position of the hammer, the inner wall surface of the rear peripheral wall portion 41 is fitted to the exhaust hole 13, the compressed gas in the gas cavity 11 is not reduced, and the electric hammer 200 performs hammering at a normal speed; when the clutch sleeve 40 is located at a light hammer gear, the through hole 45 of the clutch sleeve 40 is communicated with the exhaust hole 13 of the cylinder 10, part of compressed gas in the gas cavity 11 is discharged outwards, and the hammering reduction effect is achieved by reducing the amount of the compressed gas in the gas cavity 11. The electric hammer gear adjusting device 100 increases the gear of the light hammer without affecting the performance, is used for chiseling light working occasions such as soft geology and wood boards, and meets the requirements of customers on various working occasions.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that there are numerous alternatives to the electric hammer gear adjustment apparatus of the present invention without departing from the principles and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. A gear adjusting device of an electric hammer comprises an air cylinder, a piston, an impact block, a transmission gear and a clutch assembly, wherein the air cylinder is axially arranged, the piston and the impact block are positioned in the air cylinder, the transmission gear and the clutch assembly are sleeved on the air cylinder, the piston axially reciprocates in the air cylinder to drive the impact block to axially impact, an air cavity is formed among the air cylinder, the piston and the impact block, the transmission gear drives the air cylinder to jointly rotate through the clutch assembly, and the clutch assembly comprises a clutch sleeve connected to the transmission gear; the method is characterized in that: the cylinder is provided with exhaust holes which penetrate through the outer wall of the cylinder and are communicated with the air cavity, the clutch sleeve is provided with a rear peripheral wall part which is attached to the outer wall of the cylinder and a through hole which penetrates through the rear peripheral wall part, the clutch sleeve moves axially and is provided with a heavy hammer gear and a light hammer gear, when the clutch sleeve is positioned at the heavy hammer gear, the inner wall surface of the rear peripheral wall part is attached to the exhaust holes, when the clutch sleeve is positioned at the light hammer gear, the through hole of the clutch sleeve is communicated with the exhaust holes of the cylinder.

2. The electric hammer stage adjusting apparatus according to claim 1, wherein: the clutch sleeve is located in front of the transmission gear, the clutch sleeve is provided with a first clamping portion located at the rear end of the rear peripheral wall portion, the transmission gear is provided with a second clamping portion located at the front end, and the second clamping portion is jointed with the first clamping portion so that the clutch sleeve rotates together with the transmission gear.

3. The electric hammer stage adjusting apparatus according to claim 2, wherein: the clutch sleeve is further provided with a pure hammering gear, the second clamping portion and the first clamping portion are separated from each other at the moment, and the transmission gear cannot drive the clutch sleeve to rotate.

4. The electric hammer shift-position adjusting device according to claim 2, wherein: the clutch sleeve is provided with a front peripheral wall portion located at the front end of the rear peripheral wall portion and a step portion connecting the front peripheral wall portion and the rear peripheral wall portion, the radius of the front peripheral wall portion is larger than that of the rear peripheral wall portion, and an accommodating portion is formed between the inner wall of the front peripheral wall portion and the outer wall of the cylinder.

5. The electric hammer stage adjusting apparatus according to claim 4, wherein: the clutch assembly comprises a stopping part, an elastic piece and a clutch piece which are accommodated in the accommodating part, the stopping part is fixedly held on the inner wall of the front peripheral wall part, and the elastic piece is positioned between the stopping part and the clutch piece so that the clutch piece is abutted against the step part of the clutch sleeve.

6. The electric hammer stage adjusting apparatus according to claim 5, wherein: the stop part comprises a pressing plate and a limiting part, the pressing plate and the limiting part are sleeved on the air cylinder, the front end of the elastic part abuts against the rear end face of the pressing plate, the clutch sleeve is provided with an annular clamping groove recessed from the inner wall of the front peripheral wall part, and the limiting part is a steel wire check ring or a C-shaped clamp ring partially accommodated in the clamping groove and abuts against the front end face of the pressing plate so as to limit the axial forward movement of the pressing plate.

7. The electric hammer stage adjusting apparatus according to claim 5, wherein: the clutch piece is provided with an annular part sleeved on the periphery of the cylinder and a pin key protruding inwards from the inner wall surface of the annular part, the cylinder is provided with a key groove located on the outer wall, the pin key is connected in the key groove in a sliding mode along the axial direction, and the clutch piece moves along the axial direction relative to the cylinder and rotates together with the cylinder.

8. The electric hammer shift-position adjusting device according to claim 7, wherein: the clutch piece is provided with a bulge protruding from the annular part towards the step part, the clutch sleeve is provided with a groove which is positioned on the inner wall of the step part and is clamped with the bulge, when the clutch piece is jointed with the clutch sleeve, joint force is formed between the bulge and the groove, and the clutch piece moves along with the clutch sleeve in the axial direction so as to change the joint force between the clutch piece and the clutch sleeve.

9. The electric hammer stage adjusting apparatus according to claim 8, wherein: the first clamping part of the clutch sleeve is jointed with the second clamping part of the transmission gear, so that the transmission gear drives the clutch assembly to rotate together; when the cylinder is locked and rotated and the clutch torque of the cylinder is larger than the engaging force, the clutch piece is separated from the clutch sleeve.

10. The electric hammer stage adjusting apparatus according to claim 8, wherein: when the first clamping part of the clutch sleeve is completely jointed with the second clamping part of the transmission gear, the joint force between the clutch piece and the clutch sleeve reaches the minimum value; when the first clamping part of the clutch sleeve is not jointed with the second clamping part of the transmission gear, the joint force between the clutch piece and the clutch sleeve reaches the maximum value.