Electric hammer

Abstract

The present application discloses an electric hammer, comprising: a motor; an output shaft for matching with a working head; a motion conversion mechanism, comprising an intermediate shaft, a gear mechanism and a motion conversion piece sleeved on the intermediate shaft, the intermediate shaft being selectively movable along its axial direction to a first position, a second position and a third position; an impact mechanism, comprising an impact piece for receiving the power of the motion conversion piece and reciprocating along the output shaft; the electric hammer further comprises a support mechanism for supporting the reciprocating of the impact piece and a support bearing for supporting the intermediate shaft, when the intermediate shaft is in the third position, the working head only outputs rotation, and the support bearing and the support mechanism are in abutment. Thus, through the cooperation of the support mechanism and the support bearing, the support bearing and the support mechanism can be supported together, which can prevent the support bearing from failing, thereby prolonging the service life of the support bearing, and further prolonging the service life of the electric hammer.

Description

Technical Field

[0001] This invention relates to the field of electric hammers, and more particularly to an electric hammer. Background Technology

[0002] Electric hammers have a transmission device that switches between drilling, impact drilling, and chiseling modes. When the electric hammer is in drilling mode, the support bearing fixed to the intermediate shaft separates from the support mechanism, failing to support the intermediate shaft. This can easily lead to the failure of the support bearing on the intermediate shaft, and also to the failure of the motion conversion components, thus affecting the service life of the support bearing and the motion conversion components, and consequently, the service life of the electric hammer. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide an electric hammer that can extend its service life.

[0004] The electric hammer according to the present invention includes: a motor that rotates about a motor shaft; an output shaft for engaging with a working head, the working head being selectively outputting rotation about an output axis and / or outputting reciprocating motion along the output axis; a motion conversion mechanism for receiving power from the motor, the motion conversion mechanism including an intermediate shaft, a gear mechanism for transmitting power between the intermediate shaft and the output shaft, and a motion conversion element connected to the intermediate shaft, the output shaft being capable of being driven to output rotation by the gear mechanism, the intermediate shaft being selectively movable along its axial direction to a first position, a second position, and a third position; and an impact mechanism, including... The device includes an impact member for receiving power from the motion conversion component and reciprocating along the output axis. The impact member drives the working head to reciprocate along the output axis. When the intermediate shaft moves to the first position, the working head only outputs reciprocating motion. When the intermediate shaft moves to the second position, the working head outputs both reciprocating motion and rotation. When the intermediate shaft moves to the third position, the working head only outputs rotation. The electric hammer also includes a support mechanism for supporting the impact member's reciprocating motion and a support bearing for supporting the intermediate shaft. When the intermediate shaft is in the third position, the support bearing and the support mechanism are in support and contact.

[0005] According to the present invention, the electric hammer, through the cooperation of the support mechanism and the support bearing, can ensure that the support bearing is supported together with the support mechanism, which can prevent the support bearing from failing, thereby extending the service life of the support bearing, and thus extending the service life of the electric hammer.

[0006] In some examples of the invention, the support bearing is connected to the intermediate shaft without relative movement.

[0007] In some examples of the present invention, a position driving mechanism is also included, the position driving mechanism including a driving part fixedly connected to the support bearing, the driving part being operable to drive the support bearing and the intermediate shaft to move along the axis of the intermediate shaft.

[0008] In some examples of the present invention, the first position, the second position, and the third position are arranged sequentially along the axis of the intermediate shaft, and when the intermediate shaft is in the first position and the second position, the support bearing is in support and contact with the support mechanism.

[0009] In some examples of the present invention, the support mechanism includes a support member and a bracket, the support member being disposed between the impact member and the bracket, and the support member and the bracket being connected without relative movement.

[0010] In some examples of the present invention, the bracket is an aluminum bracket.

[0011] In some examples of the present invention, the electric hammer further includes a first end bearing for supporting the intermediate shaft, the first end bearing being sleeved on the intermediate shaft and disposed at one end of the intermediate shaft near the working head.

[0012] In some examples of the invention, the support bearing is located between the first end bearing and the end of the intermediate shaft furthest from the working head.

[0013] In some examples of the present invention, the electric hammer further includes a second end bearing for supporting the intermediate shaft, the second end bearing being sleeved on the intermediate shaft and located at the end of the intermediate shaft away from the working head.

[0014] In some examples of the present invention, the electric hammer further includes: a locking part sleeved on the intermediate shaft, the intermediate shaft having a fourth position along its axial direction, the locking part being coupled to the intermediate shaft to lock the intermediate shaft in the fourth position.

[0015] In some examples of the present invention, the locking portion has a stop portion for stopping the first end bearing, the stop portion being supported and abutting against the first end bearing.

[0016] In some examples of the present invention, when the intermediate shaft is in the fourth position, the support bearing abuts against the support mechanism.

[0017] In some examples of the present invention, the intermediate shaft axis is parallel to the output axis.

[0018] In some examples of the present invention, the output axis is arranged parallel to the axis of the motor shaft.

[0019] In some examples of the present invention, the motion conversion component is configured as a rocker arm bearing sleeved on the intermediate shaft, the impact component is configured as a cylinder, and the impact mechanism further includes a hammer cooperating with the impact component and a striking rod cooperating with the hammer, the striking rod being used to engage with the working head.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a cross-sectional view of an electric hammer according to an embodiment of the present invention;

[0023] Figure 2 This is a partially enlarged view of the electric hammer according to an embodiment of the present invention when the intermediate shaft is in the first position;

[0024] Figure 3 This is a partially enlarged view of the electric hammer according to an embodiment of the present invention, when the intermediate shaft is in the second position;

[0025] Figure 4 This is a partially enlarged view of the electric hammer according to an embodiment of the present invention when the intermediate shaft is in the third position;

[0026] Figure 5 This is a partially enlarged view of the electric hammer according to an embodiment of the present invention, when the intermediate shaft is in the fourth position. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is for reference. Figures 1-5 The electric hammer 10 of the present invention is described in an embodiment.

[0030] like Figures 1-5 As shown, the electric hammer 10 according to an embodiment of the present invention includes: a housing 1, a motor 9, an output shaft 93, a motion conversion mechanism, and an impact mechanism. The motor 9 is disposed within the housing 1 of the electric hammer, and provides electrical energy for the operation of the electric hammer 10. The motor rotates around its shaft. The output shaft 93 is used to mate with a working head 83, which can selectively rotate around the output axis and / or reciprocate along the output axis. It should be noted that the direction of the working axis (i.e., the output axis) refers to... Figure 1 The motion conversion mechanism is located within the housing 1 and receives power from the motor 9. It drives the output shaft 93 to rotate, which in turn drives the working head 83 to rotate. The motion conversion mechanism includes an intermediate shaft 3, a gear mechanism that transmits power between the intermediate shaft 3 and the output shaft 93, and a reciprocating motion conversion element 6 sleeved on the intermediate shaft 3. The intermediate shaft 3 is selectively connected to the motor 9. Specifically, the output end of the motor 9 is provided with a gear shaft 96, which is selectively connected to the intermediate shaft 3 and / or the motion conversion element 6. The intermediate shaft 3 is selectively connected to the gear shaft 96, and can selectively move along its axial direction to a first position, a second position, and a third position. That is, in the axial direction of the intermediate shaft 3, the intermediate shaft 3 can move to any one of the first, second, and third positions. Optionally, the motion conversion element 6 is configured as a rocker arm bearing sleeved on the intermediate shaft 3.

[0031] The impact mechanism includes an impact member 8 that receives power transmitted from the motion conversion mechanism and reciprocates along the output axis. The impact member 8 drives the working head 83 to reciprocate along the output axis. When the intermediate shaft 3 moves to the first position, the working head 83 only outputs reciprocating motion, and the electric hammer 10 is in hammer mode. When the intermediate shaft 3 moves to the second position, the working head 83 outputs both reciprocating motion and rotation, and the electric hammer 10 is in hammer drill mode. When the intermediate shaft 3 moves to the third position, the working head 83 only outputs rotation, and the electric hammer 10 is in drill mode.

[0032] In some embodiments of the present invention, the impact member 8 is configured as a cylinder, and the impact mechanism further includes a hammer 81 that cooperates with the impact member 8 and a striking rod 82 that cooperates with the hammer 81. The striking rod 82 is used to engage with the working head 83.

[0033] In some embodiments of the present invention, the housing 1 is pistol-like, including a main housing extending longitudinally along the output axis and a handle housing inclined at an angle to the main housing. The motion conversion mechanism, the impact mechanism, and the motor 9 are all disposed within the main housing.

[0034] Furthermore, the axis of the intermediate shaft 3 is set parallel to the output axis, and the axis of the motor shaft is set parallel to the output axis. Of course, the axis of the motor shaft can also be set perpendicular to the output axis, which is not restricted here.

[0035] Furthermore, the electric hammer 10 may also include a support mechanism 2 for supporting the reciprocating motion of the impact member 8 and a support bearing 4 for supporting the intermediate shaft 3. When the intermediate shaft 3 is in the third position, the support bearing 4 and the support mechanism 2 support and abut against each other. Specifically, the support mechanism 2 is sleeved on the outside of the impact member 8, and the inner ring of the support bearing 4 is sleeved on the intermediate shaft 3. When the intermediate shaft 3 is in the third position, the support bearing 4 and the support mechanism 2 support and abut against each other.

[0036] In some embodiments of the present invention, when the intermediate shaft 3 is in the first position, the support bearing 4 is supported and abutted against the support mechanism 2, and when the intermediate shaft 3 is in the second position, the support bearing 4 is supported and abutted against the support mechanism 2. This arrangement can ensure that the support bearing 4 is always supported and abutted against the support mechanism 2 when the intermediate shaft 3 is in the first position, the second position, and the third position.

[0037] When the electric hammer 10 is working, the intermediate shaft 3 moves along its axial direction, ensuring that the support bearing 4 and the support mechanism 2 support and abut against each other. Furthermore, when the electric hammer 10 is in drilling mode (i.e., drill mode), hammer drill mode, or hammer mode, the support bearing 4 and the support mechanism 2 can also support and abut against each other, ensuring the support effect on the intermediate shaft 3 and preventing the support bearing 4 from failing. This extends the service life of the support bearing 4, thereby extending the service life of the electric hammer 10. At the same time, it also reduces the shaking of the intermediate shaft 3 and reduces the working noise of the electric hammer 10.

[0038] Therefore, by cooperating with the support mechanism 2 and the support bearing 4, when the intermediate shaft 3 is in any of the first, second, and third positions, the support bearing 4 can be guaranteed to be supported and abutted against the support mechanism 2, which can prevent the support bearing 4 from failing, thereby extending the service life of the support bearing 4 and thus extending the service life of the electric hammer 10.

[0039] In some embodiments of the present invention, such as Figure 2 As shown, the support mechanism 2 may include a support member 22 and a bracket 21. The support member 22 is disposed between the impact member 8 and the bracket 21, and the support member 22 and the bracket 21 are connected without relative movement.

[0040] In some embodiments of the present invention, such as Figure 2As shown, the motion conversion mechanism may further include: a large cylinder 92, which is sleeved on the outside of the impact member 8, connected to the output shaft 93, and driven by gear meshing between the large cylinder 92 and the intermediate shaft 3. The output shaft 93 is hollow and is used to house the working head 83. When the intermediate shaft 3 rotates, it drives the large cylinder 92 to rotate, which in turn drives the output shaft 93 to rotate, thereby driving the working head 83 to rotate. A support member 22 is sleeved on the outside of the large cylinder 92, and a bracket 21 is sleeved on the outside of the support member 22, with the support member 22 and bracket 21 connected without relative movement. Optionally, the bracket 21 and the support member are press-fitted together. This arrangement of the support mechanism 2 can stably support the large cylinder 92 within the housing 1, thereby supporting the impact member 8 to reciprocate within the large cylinder 92, which can improve the working stability of the electric hammer 10.

[0041] In some embodiments of the present invention, the support bearing 4 and the intermediate shaft 3 are connected without relative movement. Optionally, the support bearing 4 and the intermediate shaft 3 are interference-fitted. In this case, the intermediate shaft 3 drives the support bearing 4 to move together. When the intermediate shaft 3 is in any of the first, second, and third positions, the support bearing 4 is also in the corresponding position. And no matter which position the intermediate shaft 3 and the support bearing 4 are in, the support bearing 4 and the support mechanism 2 are always in support and contact.

[0042] In some embodiments of the present invention, the support bearing 4 may also be connected to the intermediate shaft 3 with relative movement. Optionally, the support bearing 4 is loosely fitted onto the intermediate shaft 3, and the support bearing 4 is fixedly connected to the housing 1. In this case, when the intermediate shaft 3 moves to any one of the first, second, and third positions, the support bearing 4 remains in the same position, supporting and abutting against the support mechanism 2.

[0043] In some embodiments of the present invention, the support mechanism 2 can be fitted over the outer ring of the support bearing 4. This arrangement can increase the support area of ​​the support mechanism 2 and the support bearing 4, thereby improving the support strength of the support bearing 4 and further reducing the sway of the intermediate shaft 3. This makes the arrangement of the support mechanism 2 more reasonable.

[0044] In some embodiments of the present invention, the bracket 21 can be configured as an aluminum bracket. This configuration can ensure the structural strength of the support mechanism 2. When the support mechanism 2 is supported together with the support bearing 4, deformation of the support mechanism 2 can be avoided, thereby preventing the intermediate shaft 3 from moving in the axial direction perpendicular to the intermediate shaft 3, and thus ensuring that it only moves in the axial direction of the intermediate shaft 3.

[0045] In some embodiments of the present invention, such as Figures 2-5As shown, the electric hammer 10 may further include: a first end bearing 5 for supporting the intermediate shaft 3, the first end bearing 5 being sleeved on the intermediate shaft 3, and the first end bearing 5 being disposed at the other end of the intermediate shaft 3. It should be explained that one end of the intermediate shaft 3 can be... Figure 1 The right end of the middle shaft 3, the other end of the middle shaft 3 can be Figure 1 The left end of the intermediate shaft 3 can also be understood as the first end bearing 5 being located at the end of the intermediate shaft 3 near the working head 83. The first end bearing 5 can support the intermediate shaft 3, further enhancing the support strength of the support bearing 4, thereby further reducing the wobbling of the intermediate shaft 3 and improving its stability.

[0046] In some embodiments of the present invention, the support bearing 4 is located between the first end bearing 5 and one end of the intermediate shaft 3. It can also be understood that the support bearing 4 is located between the first end bearing 5 and the end of the intermediate shaft 3 away from the working head 83. The support bearing 4 is located on the right side of the first end bearing 5. Moreover, the support bearing 4 and the first end bearing 5 are arranged at a distance. This arrangement allows the support bearing 4 and the first end bearing 5 to be supported at different positions on the intermediate shaft 3, which can improve the support effect on the intermediate shaft 3.

[0047] In some embodiments of the present invention, such as Figures 2-5 As shown, the electric hammer 10 may further include: a second end bearing 91 for supporting the intermediate shaft 3. The second end bearing 91 is sleeved on the intermediate shaft 3 and is located at the end of the intermediate shaft 3 away from the working head 83. The second end bearing 91 is supported between the motion conversion member 6 and the end of the intermediate shaft 3 away from the working head 83. The second end bearing 91 can support the intermediate shaft 3, which can further improve the support strength of the support bearing 4, thereby further reducing the shaking of the intermediate shaft 3 and improving the stability of the intermediate shaft 3.

[0048] In some embodiments of the present invention, such as Figures 2-5 As shown, the gear mechanism includes a first gear part 94 disposed on the outer surface of the intermediate shaft 3, and a second gear part 95 disposed on the outer surface of the large cylinder 92 and meshing with the first gear part 94. When the intermediate shaft 3 rotates, the meshing of the first gear part 94 and the second gear part 95 can achieve the working effect of driving the large cylinder 92 to rotate, thereby ensuring the rotation of the working head 83.

[0049] In some embodiments of the present invention, such as Figures 2-5As shown, the motion conversion element 6 is selectively connected to the gear shaft 96. The motion conversion element 6 operates through a function conversion spline sleeve, providing reciprocating motion. When the intermediate shaft 3 is in the first or second position, the motion conversion element 6 can swing between the hammering position and the reset position. The impact element 8 of the electric hammer 10 is connected to the motion conversion element 6. The hammer 81 and the striking rod 82 are at least partially housed within the impact element 8. The striking rod 82 is movably disposed between the hammer 81 and the working head 83. The hammer 81 drives the striking rod 82 to strike the working head 83. Specifically, the motion conversion element 6 drives the impact element 8 to reciprocate, generating air pressure between it and the hammer 81, pushing the hammer 81 to produce a reciprocating impact motion. When the hammer 81 moves, it strikes the striking rod 82, causing the striking rod 82 to produce a reciprocating impact motion. The striking rod 82 can transmit the reciprocating impact motion to the working head 83, causing the working head 83 to produce an impact effect.

[0050] In some embodiments of the present invention, such as Figure 2 As shown, the motion conversion component 6 is located between the support bearing 4 and one end of the intermediate shaft 3. It can also be understood that the motion conversion component 6 is located on the right side of the support bearing 4. Moreover, the motion conversion component 6 and the support bearing 4 are arranged at a distance. This arrangement allows the support bearing 4 and the motion conversion component 6 to be supported at different positions on the intermediate shaft 3, which can further improve the support effect on the intermediate shaft 3.

[0051] In some embodiments of the present invention, such as Figure 2 As shown, the electric hammer 10 may further include a locking device 7, which includes a locking part 71 sleeved on the intermediate shaft 3. The locking part 71 is disposed within the housing 1. The intermediate shaft 3 has a fourth position along its axial direction. When the intermediate shaft 3 moves to the fourth position, the locking part 71 connects with the first gear part 94 on the intermediate shaft 3. For example, the locking part 71 is coupled with the first gear part 94, which can lock the intermediate shaft 3 in the fourth position. In the fourth position, the user can adjust the angle of the working head 83.

[0052] In some embodiments of the present invention, such as Figures 2-5 As shown, the locking part 71 has a stop part 98 for stopping the first end bearing 5. The stop part 98 abuts against the first end bearing 5. Since the first end bearing 5 can be interference-fitted onto the housing 1, this arrangement can stop the first end bearing 5 onto the housing 1 and prevent the first end bearing 5 from falling off the housing 1.

[0053] In some embodiments of the present invention, when the intermediate shaft 3 is in the fourth position, the support bearing 4 abuts against the support mechanism 2. This arrangement can prevent the support bearing 4 from failing, thereby extending the service life of the support bearing 4 and thus extending the service life of the electric hammer 10. At the same time, it can also reduce the shaking of the intermediate shaft 3.

[0054] In some embodiments of the present invention, the electric hammer 10 may further include: a position driving mechanism, which is used to drive the intermediate shaft 3 to move to a first position, a second position, a third position, and a fourth position, thereby achieving the working purpose of driving the intermediate shaft 3 to move.

[0055] In some embodiments of the present invention, the position driving mechanism includes a driving part 99 and a toggle part (not shown in the figure) disposed outside the housing 1. The driving part 99 is fixedly connected to the support bearing 4. Since the support bearing 4 is connected to the intermediate shaft 3 without relative movement, the driving part 99 can operably drive the support bearing 4 and the intermediate shaft 3 to move along the axis of the intermediate shaft. The driving part 99 can be configured as a toggle fork. The driving part 99 is located inside the housing 1, and the toggle part is disposed on the housing 1 and connected to the driving part 99. The toggle part drives the driving part 99 to move, thereby moving the intermediate shaft 3 to a first position, a second position, a third position, and a fourth position. When it is necessary to drive the intermediate shaft 3 to move, the user can control the driving part 99 to drive the intermediate shaft 3 to move to the first position, the second position, the third position, and the fourth position by toggling the toggle part.

[0056] The following is based on Figures 2-5 Describe the working mode of the electric hammer 10 in this application:

[0057] The electric hammer also includes a first clutch mechanism and a second clutch mechanism. The first clutch mechanism is located between the motor shaft and the intermediate shaft 3, and the second clutch mechanism is located between the motor shaft and the motion conversion component 6. Both the first clutch mechanism and the second clutch mechanism include two states: disengagement and reception.

[0058] When the intermediate shaft 3 is in the first position, the first clutch mechanism is in the disengaged state, the second clutch mechanism is in the receiving state, there is no motion transmission between the motor shaft and the intermediate shaft 3, and the motion conversion component 6 can receive the power of the motor shaft; when the intermediate shaft is in the second position, both the first clutch mechanism and the second clutch mechanism are in the receiving state, the intermediate shaft 3 can receive the power of the motor shaft, and the motion conversion component 6 can receive the power of the motor shaft; when the intermediate shaft 3 is in the third position, the first clutch mechanism is in the receiving state, the second clutch mechanism is in the disengaged state, the intermediate shaft 3 can receive the power of the motor shaft, and there is no motion transmission between the motor shaft and the motion conversion component 6.

[0059] Furthermore, the first clutch mechanism includes the gear shaft internal spline 961 of the gear shaft 96 and the intermediate shaft external spline 31 of the intermediate shaft 3. When the gear shaft internal spline 961 and the intermediate shaft external spline 31 are engaged, the first clutch mechanism is in a receiving state; when the gear shaft internal spline 961 and the intermediate shaft external spline 31 are disengaged, the first clutch mechanism is in a disengaged state. The second clutch mechanism includes the gear shaft external spline 962 of the gear shaft 96 and the motion conversion internal spline 61 of the motion conversion component 6. When the gear shaft external spline 962 and the motion conversion internal spline 61 are engaged, the second clutch mechanism is in a receiving state; when the gear shaft external spline 962 and the motion conversion internal spline 61 are disengaged, the second clutch mechanism is in a disengaged state.

[0060] like Figure 2 As shown, in the hammer stop working mode: the actuating part drives the drive part 99 and the intermediate shaft 3 to move towards the working head 83, causing the intermediate shaft 3 to move to the first position. The first clutch mechanism is in a disengaged state, and the internal spline 961 of the gear shaft 96 disengages from the external spline 31 of the intermediate shaft 3. When the electric hammer 10 is working, the drive shaft of the motor 9 rotates, which drives the gear shaft 96 to rotate. The internal spline 961 of the gear shaft 96 disengages from the external spline 31 of the intermediate shaft. At this time, the motion of the motor 9 cannot be transmitted to the intermediate shaft 3, the intermediate shaft 3 cannot rotate, and therefore the output shaft 93 cannot be driven to rotate by the intermediate shaft 3, and the working head 83 cannot rotate. Furthermore, the second clutch mechanism is in the receiving state, and the external spline 962 of the gear shaft 96 meshes with the internal spline 61 of the motion converter 6. The gear shaft 96 drives the motion converter 6 to rotate, and the motion converter 6 drives the impact member 8 to reciprocate. The impact member 8 drives the hammer 81 and the impact rod 82 to reciprocate, so that the impact rod 82 hits the drill bit 83, realizing the hammer stop working mode of the electric hammer 10.

[0061] In addition, such as Figure 5 As shown, when the electric hammer 10 is in the hammer mode, the knob toggle drives the drive unit 99 and the intermediate shaft 3 to move towards the working head 83, causing the intermediate shaft 3 to move to the fourth position. The angle of the working head 83 can be adjusted. At this time, the internal spline 961 of the gear shaft 96 disengages from the external spline 31 of the intermediate shaft 3, and the external spline 962 of the gear shaft meshes with the internal spline 61 of the motion conversion component. The first gear 94 meshes with the locking part 71. At this time, the intermediate shaft 3 is locked, and the output shaft 93 and the intermediate shaft 3 do not rotate. Therefore, the angle of the working head 83 can be manually adjusted, realizing the working effect of adjusting the angle of the working head 83 in the hammer mode (transition gear).

[0062] like Figure 3As shown, the hammer drill mode is as follows: the knob toggle drives the drive unit 99 and the intermediate shaft 3 to move towards the motor 9, moving the intermediate shaft 3 to the second position. Both the first and second clutch mechanisms are in the receiving state. When the electric hammer 10 is working, the drive shaft of the motor 9 rotates, which drives the gear shaft 96 to rotate. The internal spline 961 of the gear shaft 96 meshes with the intermediate shaft 3, and the gear shaft 96 drives the intermediate shaft 3 to rotate. The first gear part 94 meshes with the second gear part 95, and the intermediate shaft 3 drives the second gear part 95 and the large cylinder 9... 2. Rotation: The large cylinder 92 is connected to the output shaft 93 by four steel pins, so the output shaft 93 rotates together with the large cylinder 92. The output shaft 93 drives the working head 83 to rotate. At the same time, the external spline 962 of the gear shaft 96 meshes with the internal spline 61 of the motion converter 6. The gear shaft 96 drives the motion converter 6 to rotate. The motion converter 6 drives the impact member 8 to reciprocate. The impact member 8 drives the hammer 81 and the impact rod 82 to reciprocate, so that the impact rod 82 hits the working head 83, realizing the hammer drilling motion of the working head 83 of the electric hammer 10.

[0063] like Figure 4 As shown, in the drilling mode: the knob toggle drives the drive unit 99 and the intermediate shaft 3 to move towards the motor 9, causing the intermediate shaft 3 to move to the third position. The first clutch mechanism is in the receiving state, and the second clutch mechanism is in the disengaged state. The internal spline 961 of the gear shaft 96 meshes with the external spline 31 of the intermediate shaft 3, and the external spline 962 of the gear shaft 96 disengages from the internal spline 61 of the motion conversion component 6. When the electric hammer 10 is working, the drive shaft of the motor 9 rotates, which drives the gear shaft 96 to rotate. The internal spline 961 of the gear shaft 96 meshes with the external spline 31 of the intermediate shaft 3, and the gear shaft 96 drives the intermediate shaft 3 to rotate. The first gear part 94 meshes with the second gear part 95, and the intermediate shaft 3 drives the second gear part 95 and the large cylinder 92 to rotate. The large cylinder 92 is connected to the output shaft 93 by four steel pins, so the output shaft 93 rotates together with the large cylinder 92, and the output shaft 93 drives the working head 83 to rotate. In addition, the external spline 962 of the gear shaft 96 disengages from the internal spline 61 of the motion converter 6, so the gear shaft 96 rotates, but the motion converter 6 does not rotate, and the impact member 8, the hammer 81, and the rod 82 do not reciprocate, thus realizing the drilling motion of the working head 83 of the electric hammer 10.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric hammer, comprising: An electric motor, which rotates about a motor shaft; An output shaft is used to mate with a working head, which can selectively output rotation about the output axis and / or reciprocate along the output axis; A motion conversion mechanism is provided for receiving power from the motor. The motion conversion mechanism includes an intermediate shaft, a gear mechanism for transmitting power between the intermediate shaft and the output shaft, and a motion conversion component connected to the intermediate shaft. The output shaft can be driven to rotate by the gear mechanism. The intermediate shaft can be selectively moved along the axial direction of the intermediate shaft to a first position, a second position, and a third position. An impact mechanism includes an impact member for receiving power from the motion conversion member and reciprocating along the output axis, the impact member driving the working head to reciprocate along the output axis; wherein, when the intermediate shaft moves to the first position, the working head only outputs reciprocating motion; when the intermediate shaft moves to the second position, the working head outputs both reciprocating motion and rotation; and when the intermediate shaft moves to the third position, the working head only outputs rotation. The electric hammer is characterized in that it further includes a support mechanism for supporting the impact member to reciprocate and a support bearing for supporting the intermediate shaft. When the intermediate shaft is in the third position, the support bearing is in support and abuts against the support mechanism. During the movement of the intermediate shaft along the axial direction, the support bearing and the support mechanism never disengage.

2. The electric hammer according to claim 1, characterized in that, The support bearing is connected to the intermediate shaft without relative movement.

3. The electric hammer according to claim 2, characterized in that, It also includes a position drive mechanism, which includes a drive unit fixedly connected to the support bearing, and the drive unit operably drives the support bearing and the intermediate shaft to move along the axis of the intermediate shaft.

4. The electric hammer according to claim 1, characterized in that, The first position, the second position, and the third position are arranged sequentially along the axis of the intermediate shaft. When the intermediate shaft is in the first and second positions, the support bearing is in support and contact with the support mechanism.

5. The electric hammer according to claim 1, characterized in that, The support mechanism includes a support member and a bracket. The support member is disposed between the impact member and the bracket, and the support member and the bracket are connected without relative movement.

6. The electric hammer according to claim 5, characterized in that, The bracket is an aluminum bracket.

7. The electric hammer according to claim 1, characterized in that, It also includes a first end bearing for supporting the intermediate shaft, the first end bearing being sleeved on the intermediate shaft and disposed at one end of the intermediate shaft near the working head.

8. The electric hammer according to claim 7, characterized in that, The support bearing is located between the first end bearing and the end of the intermediate shaft furthest from the working head.

9. The electric hammer according to claim 1, characterized in that, It also includes a second end bearing for supporting the intermediate shaft, the second end bearing being sleeved on the intermediate shaft and located at the end of the intermediate shaft away from the working head.

10. The electric hammer according to claim 7, characterized in that, Also includes: A locking part is sleeved on the intermediate shaft, the intermediate shaft has a fourth position along the axis of the intermediate shaft, and the locking part can be coupled to the intermediate shaft to lock the intermediate shaft in the fourth position.

11. The electric hammer according to claim 10, characterized in that, The locking part has a stop part for stopping the first end bearing, and the stop part supports and abuts against the first end bearing.

12. The electric hammer according to claim 10, characterized in that, When the intermediate shaft is in the fourth position, the support bearing is in support contact with the support mechanism.

13. The electric hammer according to claim 1, characterized in that, The intermediate shaft axis is arranged parallel to the output shaft axis.

14. The electric hammer according to claim 1, characterized in that, The output axis is set parallel to the axis of the motor shaft.

15. The electric hammer according to claim 1, characterized in that, The motion conversion component is configured as a rocker arm bearing sleeved on the intermediate shaft, the impact component is configured as a cylinder, and the impact mechanism further includes a hammer that cooperates with the impact component and a striking rod that cooperates with the hammer. The striking rod is used to connect with the working head.

Images