CN211517388U

CN211517388U - Electric hammer

Info

Publication number: CN211517388U
Application number: CN201922413048.6U
Authority: CN
Inventors: 侯维平
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-09-18
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses an electric hammer, which comprises a shell, a cylinder, an output gear, a rotary switching component and a switching piece; the output gear is sleeved on the outer surface of the air cylinder and is in relative rotation connection with the air cylinder, the rotary switching assembly is sleeved on the outer surface of the air cylinder and can axially slide relative to the air cylinder, and the switching piece can interrupt the transmission connection between the rotary switching assembly and the transmission gear; be equipped with the internal tooth in the casing, rotatory switching subassembly is equipped with the external tooth, and the internal tooth has the guide part of relative setting with the external tooth end, and switching piece can push the external tooth in the internal tooth to locking rotatory switching subassembly, when the external tooth with when the internal tooth is contradicted, the guide part of internal tooth with the guide part dislocation of external tooth slides.

Description

Electric hammer

[ technical field ]

The utility model relates to an electric tool field, in particular to electric hammer who strikes or rotatory impact operation to concrete, masonry isotructure.

[ background art ]

The electric hammer is provided with an output gear sleeved on the cylinder, the output gear transmits a rotating force to the rotary switching assembly, the rotary switching assembly drives the cylinder to rotate together, and then the tool head of the electric hammer is subjected to rotary output, an operator can drive the rotary switching assembly to keep away from the output gear as required so as to disconnect the rotary output of the tool head, and further the independent impact function of the electric hammer is realized. The operator often needs to lock the rotary switch assembly so that the tool bit is not rotatable to accurately chisel the workpiece.

For example, chinese patent publication No. CN100415453C discloses a hammer drill, which comprises: the connecting piece is connected with the bevel gear in a transmission mode, the connecting piece rotates together with the air cylinder, the first spring pushes the connecting piece backwards, the front periphery of the connecting piece is in contact with the eccentric pin of the switching part, the connecting piece is selectively connected with the rotating locking piece through a connecting claw, and the outer peripheral surface of the rotating locking piece is matched with the inner peripheral surface of the air cylinder shell through spline fit. Therefore, the rotation lock member can axially slide on the inner peripheral surface of the cylinder housing, but cannot circumferentially rotate. A second spring is installed between the rotation lock and the ball bearing for constantly urging the rotation lock rearward, and the eccentric pin of the switching member urges the coupling member to be disengaged from the bevel gear and into engagement with the rotation lock when the hammer drill enters the impact-only mode. The rotation lock locks the coupling member to prevent rotation of the coupling member.

However, the above-mentioned manner of preventing the rotation of the connecting member must be achieved by means of the rotation locking member in cooperation with the second spring, which is costly and cumbersome to install.

[ contents of utility model ]

In order to solve the problem, the utility model provides a low-cost electric hammer.

In order to solve the technical problem, the utility model adopts the following technical scheme: an electric hammer comprises a shell, a cylinder, an output gear, a rotary switching component, a spring, a switching piece and a motor; the air cylinder is supported in the shell, the output gear is sleeved on the outer surface of the air cylinder and is in relative rotation connection with the air cylinder, the motor drives the output gear to rotate, the rotary switching assembly is sleeved on the outer surface of the air cylinder and can axially slide relative to the air cylinder, the spring is pre-pressed at one end of the rotary switching assembly, the other end of the rotary switching assembly is pressed against the output gear and is in transmission connection with the output gear, the rotary switching assembly drives the air cylinder to rotate together, the switching piece can drive the rotary switching assembly to axially keep away from the output gear, and the transmission connection between the rotary switching assembly and the output gear is interrupted; be equipped with the internal tooth in the casing, rotatory switching subassembly is equipped with the external tooth, the internal tooth has the guide part of relative setting with the external tooth end, works as the external tooth with when the internal tooth is contradicted, the guide part of internal tooth with the guide part dislocation of external tooth slides, the switching piece can push the external tooth of rotatory switching subassembly between the internal tooth to the rotatory switching subassembly of locking.

The further improvement scheme is as follows: the outer wall of the cylinder is connected with the inner wall of the rotary switching assembly through a key groove.

The further improvement scheme is as follows: the rotary switching component is connected with the output gear through end teeth or key grooves.

The further improvement scheme is as follows: the switching piece is an eccentric wheel component arranged on the machine shell, and the eccentric wheel component is abutted against the rotary switching component.

The further improvement scheme is as follows: the casing of the electric hammer also comprises a bearing supported at one end of the cylinder, and the other end of the spring is supported on the side wall of the bearing.

The further improvement scheme is as follows: the output gear is axially limited on the cylinder.

The further improvement scheme is as follows: the switching piece comprises a switching arm and an eccentric wheel driving the switching arm to move axially, and the switching arm is abutted against the rotary switching component.

The further improvement scheme is as follows: the rotary switching assembly comprises a sleeve, a driving ring, a clutch spring and a transmission sleeve, wherein the driving ring, the clutch spring and the transmission sleeve are sleeved in the sleeve; the output direction of the electric hammer is defined as the left end, the left end of the sleeve is convexly provided with a step part towards the axis direction, the left end of the driving ring is in transmission connection with the step part through end teeth, and the inner ring of the driving ring is connected with the outer ring key groove of the cylinder; the left end of the clutch spring abuts against the driving ring, and the right end of the clutch spring abuts against the transmission sleeve; the right end of the sleeve is provided with a stopping part, and the right end of the transmission sleeve is abutted against the stopping part; the outer ring of the transmission sleeve is connected with the inner ring of the sleeve through a key groove, and the right end of the transmission sleeve is provided with an end tooth or a key groove which is in meshed connection with the output gear; when the electric hammer is overloaded, the end teeth on the driving ring and the sleeve are disengaged against the elastic force of the clutch spring.

The further improvement scheme is as follows: the stopping part is a clamp spring clamped at the right end of the sleeve.

Compared with the prior art the utility model discloses following beneficial effect has: be equipped with the internal tooth in the casing of electric hammer, rotatory switching module is equipped with the external tooth, the internal tooth has the guide part of relative setting with the external tooth end, and the dislocation slides takes place when contradicting for the guide part that should set up relatively, when needs locking rotatory switching module, need not with the help of other parts, and the switching piece has both simplified installation procedure and has practiced thrift the cost through this guide part can be smooth and easy push the internal tooth with the external tooth.

[ description of the drawings ]

Fig. 1 is a sectional view of the electric hammer of the present invention;

FIG. 2 is a cross-sectional view of the rotational system of FIG. 1;

FIG. 3 is a cross-sectional view of the rotary switch assembly of FIG. 2;

the electric hammer comprises an electric hammer 100, a machine shell 1, internal teeth 1a, a cylinder 2, an output gear 3, a rotation switching component 4, a sleeve 4a, external teeth 4 a', a driving ring 4b, a clutch spring 4c, a transmission sleeve 4d, a clamp spring 4f, a spring 5, a switching piece 6, a switching arm 6a, an eccentric wheel 6b, a bearing 7, a motor 10, a rotation gear component 11, an impact crank component 12, a piston 13, a hammer 14, a connecting rod 15 and a tool head 16.

[ detailed description of the invention ]

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 1, the present invention discloses an electric hammer 100, which defines the output direction of the electric hammer as the left end, the electric hammer includes a housing 1, a cylinder 2 supported in the housing 1, a tool bit 16 installed at the front end of the cylinder 2, a motor 10, and a rotation system and an impact system driven by the motor 10, and the electric hammer can implement different output modes for the tool bit 16 according to the output combination form of the rotation system and the impact system.

The impact system comprises an impact crank component 12 arranged in the machine shell, and an impact piston 13, a hammer 14 and a connecting rod 15 which are respectively sleeved in the cylinder 2 from right to left. The right end of the impact piston 13 is connected to the impact crank assembly 12. When the electric hammer works, the motor 10 drives the impact crank assembly 12 to rotate, a transmission clutch mechanism connected with the motor 10 is arranged on the impact crank assembly 12 so as to keep or disconnect impact output (not shown), the impact crank assembly 12 drives the impact piston 13 to reciprocate, and the impact piston 13 compresses air and drives the impact hammer 14 to impact forwards. The ram 14 impacts the link 15 and the link 15 transmits the impact force to the tool bit 16.

The rotating system comprises a rotating gear assembly 11, an output gear 3, a rotating switching assembly 4, a spring 5 and a switching piece 6 which are arranged in the machine shell. The output gear 3 is sleeved on the outer surface of the cylinder 2 and is connected with the cylinder 2 in a relative rotation mode, the output gear 3 is axially limited on the cylinder 2, and the motor 10 drives the output gear 3 through the rotating gear assembly 11. The outer surface of the cylinder 2 is sleeved with the rotary switching component 4, the rotary switching component can axially slide relative to the cylinder 2, the inner wall of the rotary switching component 4 is connected with the outer wall of the cylinder 2 through a key groove, one end of the rotary switching component 4 is in transmission connection with the output gear 3 through the key groove, the end gear can be in transmission connection with other forms, the output gear 3 drives the rotary switching component 4 to rotate, and the rotary switching component 4 further drives the cylinder 2 to rotate together. The housing 1 of the electric hammer 100 further includes a bearing 7 supported at one end of the cylinder 2, the other end of the spring 5 is supported on a side wall of the bearing 7, and the other end of the spring 5 is pre-pressed on the rotation switching assembly 4. The utility model discloses in carry out the axial spacing to output gear 3 to make rotatory switching module 4 realize good meshing with output gear 3 under the pre-pressure of spring 5. At the moment, the rotating system outputs rotation, and the rotating mode and the rotating impact mode can be realized by adjusting the clutch mechanism of the impact system.

Referring to fig. 2, the switch member 6 has a switch arm 6a and an eccentric wheel 6b for driving the switch arm 6a to move axially, and the switch arm 6a abuts against the rotary switch assembly 4. When eccentric 6b rotates, switching arm 6a drives rotary switching assembly 4 axially away from output gear 3 and interrupts the drive connection of rotary switching assembly 4 with output gear 3. In the process that the eccentric wheel 6b does not rotate to the end point, the rotary output of the electric hammer is interrupted, and the electric hammer is in the impact mode, but the tool bit 16 at this time is not restricted in the rotational direction, and accurate machining of the workpiece cannot be performed.

The internal tooth 1a is arranged in the machine shell 1, the rotary switching component 4 is provided with an external tooth 4a 'used for being meshed with the internal tooth 1a, the tail ends of the internal tooth 1a and the external tooth 4 a' are both provided with blade-shaped guide parts, and the blade-shaped guide parts mean that the outer end parts of the teeth are provided with sharp points or round corners, so that staggered sliding can be achieved when meshing is conducted, and mutual propping is avoided when meshing is conducted. After rotatory switching module 4 is connected with output gear 3 transmission and is interrupted, continue to rotate eccentric wheel 6b, when the guide part of internal tooth 1a conflicts with the guide part of external tooth 4a ', the automatic dislocation that takes place of the guide part of internal tooth 1a and external tooth 4a ' under the drive of eccentric wheel 6b, and then switching piece 6 can be smooth and easy push into internal tooth 1a with external tooth 4a ' through above-mentioned guide part to locking rotatory switching module 4, cylinder 2 and tool bit 16 with rotatory switching module 4 transmission connection this moment can not rotate, and then make processing more accurate.

Referring to fig. 3, the rotation switching assembly 4 includes a sleeve 4a, and a driving ring 4b, a clutch spring 4c and a transmission sleeve 4d sequentially sleeved in the sleeve 4 a. The left end of the sleeve 4a protrudes towards the axis direction to form a step part, the left end of the driving ring 4b is in transmission connection with the step part through end teeth, and the inner wall of the driving ring 4b is connected with the outer wall of the cylinder 2 through a key groove. The clutch spring 4c has a left end abutting against the drive ring 4b and a right end abutting against the transmission sleeve 4 d. The right end of the sleeve 4a is provided with a stopping part which is a clamp spring 4f, and the right end of the transmission sleeve 4d is abutted against the clamp spring 4 f. The circlip 4f is used to pre-compress the clutch spring 4c to press the driving ring 4b against the step portion.

The outer ring of the transmission sleeve 4d is connected with the inner ring of the sleeve 4a through a key groove, the right end of the transmission sleeve 4d is provided with a key groove meshed with the output gear 3, and other connecting structures such as end teeth can be adopted. When the electric hammer 100 is overloaded, the tool head 16 receives resistance in the rotating direction, the resistance is further transmitted to the driving ring 4b through the air cylinder 2, the motor 10 keeps running, and the driving ring 4b and the end teeth on the sleeve 4a are released against the elastic force of the clutch spring 4c, so that the motor is prevented from being burnt due to overload.

The utility model discloses be equipped with internal tooth 1a in electric hammer 100's casing 1, rotatory switching module 4 is equipped with external tooth 4 a', internal tooth 1a has the relative guide part that sets up with external tooth 4a 'end, and the dislocation of this relative guide part that sets up takes place when contradicting slides, and when needs locking cylinder 2, need not with the help of other parts, switching piece 6 through this guide part can be smooth and easy push into internal tooth 1a with external tooth 4 a', has both simplified installation procedure and has practiced thrift the cost.

The present invention is not limited to the above embodiments, and the scope of the present invention is subject to the claims.

Claims

1. An electric hammer comprises a shell, a cylinder, an output gear, a rotary switching component, a spring, a switching piece and a motor; the air cylinder is supported in the shell, the output gear is sleeved on the outer surface of the air cylinder and is in relative rotation connection with the air cylinder, the motor drives the output gear to rotate, the rotary switching assembly is sleeved on the outer surface of the air cylinder and can axially slide relative to the air cylinder, the spring is pre-pressed at one end of the rotary switching assembly, the other end of the rotary switching assembly is pressed against the output gear and is in transmission connection with the output gear, the rotary switching assembly drives the air cylinder to rotate together, the switching piece can drive the rotary switching assembly to axially keep away from the output gear, and the transmission connection between the rotary switching assembly and the output gear is interrupted; the method is characterized in that: be equipped with the internal tooth in the casing, rotatory switching subassembly is equipped with the external tooth, the internal tooth has the guide part of relative setting with the external tooth end, works as the external tooth with when the internal tooth is contradicted, the guide part of internal tooth with the guide part dislocation of external tooth slides, the switching piece can push the external tooth of rotatory switching subassembly between the internal tooth to the rotatory switching subassembly of locking.

2. The electric hammer of claim 1, wherein: the outer wall of the cylinder is connected with the inner wall of the rotary switching assembly through a key groove.

3. The electric hammer of claim 1, wherein: the rotary switching component is connected with the output gear through end teeth or key grooves.

4. The electric hammer of claim 1, wherein: the switching piece is an eccentric wheel component arranged on the machine shell, and the eccentric wheel component is abutted against the rotary switching component.

5. The electric hammer of claim 1, wherein: the casing of the electric hammer also comprises a bearing supported at one end of the cylinder, and the other end of the spring is supported on the side wall of the bearing.

6. An electric hammer according to claim 3, wherein: the output gear is axially limited on the cylinder.

7. The electric hammer of claim 4, wherein: the switching piece comprises a switching arm and an eccentric wheel driving the switching arm to move axially, and the switching arm is abutted against the rotary switching component.

8. An electric hammer according to any one of claims 1 to 7, wherein: the rotary switching assembly comprises a sleeve, a driving ring, a clutch spring and a transmission sleeve, wherein the driving ring, the clutch spring and the transmission sleeve are sleeved in the sleeve; the output direction of the electric hammer is defined as the left end, the left end of the sleeve is convexly provided with a step part towards the axis direction, the left end of the driving ring is in transmission connection with the step part through end teeth, and the inner ring of the driving ring is connected with the outer ring key groove of the cylinder; the left end of the clutch spring abuts against the driving ring, and the right end of the clutch spring abuts against the transmission sleeve; the right end of the sleeve is provided with a stopping part, and the right end of the transmission sleeve is abutted against the stopping part; the outer ring of the transmission sleeve is connected with the inner ring of the sleeve through a key groove, and the right end of the transmission sleeve is provided with an end tooth or a key groove which is in meshed connection with the output gear; when the electric hammer is overloaded, the end teeth on the driving ring and the sleeve are disengaged against the elastic force of the clutch spring.

9. The electric hammer of claim 8, wherein: the stopping part is a clamp spring clamped at the right end of the sleeve.