WO2021115332A1

WO2021115332A1 - Electric hammer

Info

Publication number: WO2021115332A1
Application number: PCT/CN2020/134948
Authority: WO
Inventors: 邱国富; 顾金发
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2019-12-09
Filing date: 2020-12-09
Publication date: 2021-06-17
Also published as: CN214723942U; CN113021272A

Abstract

An electric hammer (10), comprising: an electric motor (9); an output shaft (93) configured to mate with a working head (83); a motion conversion mechanism, comprising an intermediate shaft (3), a gear mechanism and a motion conversion member (6) sleeved on the intermediate shaft, the intermediate shaft selectively moving along the axial direction thereof to a first position, a second position and a third position; and an impact mechanism, comprising an impact member (8) for receiving power from the motion conversion member and reciprocating along an output axis. The electric hammer further comprises a support mechanism (2) for supporting the impact member to reciprocate, and a support bearing (4) for supporting the intermediate shaft, and when the intermediate shaft is in the third position, the working head only outputs the rotation, and the support bearing is in support contact with the support mechanism. Thus, by means of the cooperation between the support mechanism and the support bearing, it can be ensured that the support bearing and the support mechanism are supported together, so as to prevent the failure of the support bearing, thereby prolonging the service life of the support bearing, further prolonging the service life of an electric hammer.

Description

Electric hammer

This application claims the priority of the Chinese patent application whose application date is December 9, 2019 and the application number is 201911252172.7, the entire content of which is incorporated into this application by reference.

Technical field

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

Background technique

The electric hammer has a transmission device that switches between drilling, percussion drilling, and chiseling. Among them, when the electric hammer is in the drilling gear, the support bearing fixed on the intermediate shaft is separated from the support mechanism, which can not play the role of supporting the intermediate shaft, which easily causes the support bearing on the intermediate shaft to fail, and it is also easy to cause the motion converter to fail. , Thereby affecting the service life of the support bearing and the motion conversion part, and thus the service life of the electric hammer.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide an electric hammer, which can prolong the service life of the electric hammer.

The electric hammer according to the present invention includes: a motor that rotates around the motor shaft; an output shaft for mating with a working head, the working head can selectively output rotation around an output axis and/or output reciprocating motion along the output axis Motion conversion mechanism, the motion conversion mechanism is used to receive the power of the motor, the motion conversion mechanism includes an intermediate shaft, a gear mechanism that transmits power between the intermediate shaft and the output shaft, and the intermediate Shaft-connected motion conversion part motion conversion part, the output shaft can be driven by the gear mechanism to output rotation, the intermediate shaft can be selectively moved along its axis direction to the first position, the second position and the third position; impact The mechanism includes an impact member for receiving the power of the motion conversion member and reciprocating along the output axis, the impact member is used to drive the working head to reciprocate along the output axis; wherein the intermediate shaft moves to the In 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 the intermediate shaft moves to the third position. Position, the working head only outputs rotation; the electric hammer also includes a support mechanism that supports the impact member for reciprocating motion and a support bearing that supports the intermediate shaft. When the intermediate shaft is in the third position, the The support bearing supports and abuts against the support mechanism.

According to the electric hammer of the present invention, through the cooperation of the supporting mechanism and the supporting bearing, the supporting bearing and the supporting mechanism can be ensured to be supported together, and the failure of the supporting bearing can be prevented, so that the service life of the supporting bearing can be prolonged, and the service life of the electric hammer can be extended.

In some examples of the present invention, the support bearing and the intermediate shaft are connected without relative movement.

In some examples of the present invention, a position drive mechanism is further included. The position drive mechanism includes a drive portion fixedly connected to the support bearing, and the drive portion operably drives the support bearing and the intermediate shaft along the intermediate shaft axis. Move in direction.

In some examples of the present invention, the first position, the second position, and the third position are sequentially arranged along the axis of the intermediate shaft. When the intermediate shaft is in the first position and the second position, the support bearing is Supporting and abutting with the supporting mechanism.

In some examples of the present invention, 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.

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

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 is sleeved on the intermediate shaft, and the first end bearing is arranged at The intermediate shaft is close to one end of the working head.

In some examples of the present invention, the support bearing is located between the first end bearing and an end of the intermediate shaft away from the working head.

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 is sleeved on the intermediate shaft, and the second end bearing is arranged at One end of the intermediate shaft away from the working head.

In some examples of the present invention, the electric hammer further includes: a locking portion sleeved on the intermediate shaft, the intermediate shaft has a fourth position along its axial direction, and the locking portion is connected to the intermediate shaft. The shaft is coupled to lock the intermediate shaft in the fourth position.

In some examples of the present invention, the locking portion has a stop portion for stopping the first end bearing, and the stop portion supports and abuts against the first end bearing.

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

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

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

In some examples of the present invention, the motion conversion member is provided with a pendulum bearing set on the intermediate shaft, the impact member is configured as an air cylinder, and the impact mechanism further includes a hammer and a hammer matched with the impact member. A striker matched with the striker, and the striker is used for mating with the working head.

The additional aspects and advantages of the present invention will be partly given in the following description, and partly will become obvious from the following description, or be understood through the practice of the present invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

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

2 is a partial enlarged view of the electric hammer according to the embodiment of the present invention when the intermediate shaft is located at the first position;

3 is a partial enlarged view of the electric hammer according to the embodiment of the present invention when the intermediate shaft is located at the second position;

Figure 4 is a partial enlarged view of the electric hammer according to the embodiment of the present invention when the intermediate shaft is located at the third position;

Fig. 5 is a partial enlarged view of the electric hammer according to the embodiment of the present invention when the intermediate shaft is located at the fourth position.

Detailed ways

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, but should not be understood as limiting the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations.

The electric hammer 10 according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIGS. 1 to 5, the electric hammer 10 according to the 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 arranged in the housing 1 of the electric hammer, the motor 9 provides electric energy for the work of the electric hammer 10, and the motor rotates around the motor shaft. The output shaft 93 is used for mating with the working head 83. The working head 83 can optionally output rotation around the output axis and/or reciprocate around the output axis. It should be noted that the direction of the working axis (that is, the output axis) refers to the figure 1 in the left and right direction. The motion conversion mechanism is arranged in the housing 1, and the motion conversion mechanism is used to receive the power of the motor 9, which can drive the output shaft 93 to rotate, and then the output shaft 93 drives the working head 83 to rotate. The motion conversion mechanism includes the intermediate shaft 3 and the intermediate shaft. 3 and the output shaft 93 to transmit power between the gear mechanism and the movement conversion member 6 sleeved on the intermediate shaft 3 to reciprocate. Among them, the intermediate shaft 3 and the motor 9 are selectively connected. Specifically, the output end of the motor 9 is provided with a gear shaft 96, which is selectively connected with the intermediate shaft 3 and/or the motion conversion member 6, and the intermediate shaft 3 is selected Is sexually connected to the gear shaft 96, the intermediate shaft 3 can be selectively moved between the first position, the second position and the third position along its axial direction, that is, in the axial direction of the intermediate shaft 3, the intermediate shaft 3 can be moved to any one of the first position, the second position and the third position. Optionally, the motion conversion member 6 is provided with a swing rod bearing set on the intermediate shaft 3 as a set.

The impact mechanism includes an impact member 8 for receiving the power transmitted by the motion conversion mechanism and reciprocating along the output axis. The impact member 8 is used to drive 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 the hammer gear working 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 the 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 the drilling mode.

In some embodiments of the present invention, the impact member 8 is configured as an air cylinder, and the impact mechanism further includes a ram 81 matched with the impact member 8 and a ram 82 matched with the ram 81. The ram 82 is used for matching with the working head 83. Pick up.

In some embodiments of the present invention, the housing 1 has a pistol-like shape, and includes a main housing extending longitudinally along the output axis and a handle housing inclined at an angle with the main housing. Among them, the motion conversion mechanism, the impact mechanism and the motor 9 are all arranged in the main housing.

Further, the axis of the intermediate shaft 3 is arranged parallel to the output axis, and the axis of the motor shaft is arranged parallel to the output axis. Of course, the axis of the motor shaft can also be arranged perpendicular to the output axis, which is not limited here.

Further, the electric hammer 10 may also include a support mechanism 2 that supports the impact member 8 for reciprocating motion and a support bearing 4 that supports 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 Specifically, the supporting mechanism 2 is sleeved on the outer side of the impact member 8, and the inner ring of the supporting bearing 4 is sleeved on the intermediate shaft 3. When the intermediate shaft 3 is in the third position, the supporting bearing 4 and the supporting mechanism 2 support and abut.

In some embodiments of the present invention, when the intermediate shaft 3 is in the first position, the support bearing 4 supports and abuts against the support mechanism 2, and when the intermediate shaft 3 is in the second position, the support bearing 4 supports and abuts against the support mechanism 2 Such an arrangement can ensure that when the intermediate shaft 3 is in the first position, the second position, and the third position, the supporting bearing 4 is always supported and abutted with the supporting mechanism 2.

Among them, when the electric hammer 10 is working, during the movement of the intermediate shaft 3 along its axial direction, the supporting bearing 4 and the supporting mechanism 2 can be ensured to support each other, and the electric hammer 10 is in the drilling gear (that is, the drilling gear is working). Mode), in the hammer drill mode and the hammer mode, the support bearing 4 and the support mechanism 2 can also be supported and abutted together, which can ensure the supporting effect of the intermediate shaft 3, and can also prevent the support bearing 4 from failing. The service life of the supporting bearing 4 is prolonged, and the service life of the electric hammer 10 can be prolonged. At the same time, the shaking of the intermediate shaft 3 can be reduced, and the working noise of the electric hammer 10 can be reduced.

Thus, through the cooperation of the supporting mechanism 2 and the supporting bearing 4, when the intermediate shaft 3 is in any one of the first position, the second position and the third position, the supporting bearing 4 and the supporting mechanism 2 can be ensured to support and abut together. The failure of the supporting bearing 4 can be prevented, so that the service life of the supporting bearing 4 can be prolonged, and the service life of the electric hammer 10 can be prolonged.

In some embodiments of the present invention, as shown in FIG. 2, the supporting mechanism 2 may include a supporting member 22 and a bracket 21. The supporting member 22 is arranged between the impact member 8 and the bracket 21, and there is no relative movement between the supporting member 22 and the bracket 21. Connection.

In some embodiments of the present invention, as shown in FIG. 2, the motion conversion mechanism may further include: a large cylinder 92, the large cylinder 92 is sleeved on the outside of the impact member 8, the large cylinder 92 is connected to the output shaft 93, and the large cylinder 92 The intermediate shaft 3 is meshed and driven by gears, the output shaft 93 is hollow, and the output shaft 93 is used for accommodating the working head 83. Among them, when the intermediate shaft 3 rotates, the intermediate shaft 3 can drive the large cylinder 92 to rotate, and when the large cylinder 92 rotates, it drives the output shaft 93 to rotate, so that the output shaft 93 drives the working head 83 to rotate. Wherein, the support 22 is sleeved on the outside of the large cylinder 92, the support 21 is sleeved on the outside of the support 22, and the support 22 and the support 21 are connected without relative movement. Optionally, the support 21 and the support are interference press-fitted Together, the support mechanism 2 provided in this way can stably support the large cylinder 92 in the housing 1, and then support the impact member 8 to reciprocate in the large cylinder 92, which can improve the working stability of the electric hammer 10.

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 is in an interference connection with the intermediate shaft 3. At this time, the intermediate shaft 3 drives the support bearing 4 to move together. When the intermediate shaft 3 is in any one of the first position, the second position, and the third position, the support bearing 4 is also located at the corresponding position, and the intermediate shaft 3 and the support The bearing 4 is located at any position, and the supporting bearing 4 and the supporting mechanism 2 always support and abut.

In some embodiments of the present invention, the support bearing 4 may also be connected with the intermediate shaft 3 in a relatively movable manner. Optionally, the supporting bearing 4 is hollowed on the intermediate shaft 3, and the supporting bearing 4 is fixedly connected to the housing 1. At this time, the intermediate shaft 3 moves to any one of the first position, the second position, and the third position, and the support bearing 4 is always located at the same position and abuts against the support mechanism 2.

In some embodiments of the present invention, the support mechanism 2 can be sheathed on 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, and can improve the support strength of the support bearing 4, thereby further By reducing the shaking of the intermediate shaft 3, the arrangement form of the supporting mechanism 2 can be made more reasonable.

In some embodiments of the present invention, the bracket 21 can be configured as an aluminum bracket. Such a configuration can ensure the structural strength of the supporting mechanism 2. When the supporting mechanism 2 and the supporting bearing 4 are supported together, the supporting mechanism 2 can be prevented from being deformed. The intermediate shaft 3 is prevented from moving in the axial direction perpendicular to the intermediate shaft 3, thereby ensuring that it only moves in the axial direction of the intermediate shaft 3.

In some embodiments of the present invention, as shown in FIGS. 2 to 5, the electric hammer 10 may further include: a first end bearing 5 for supporting the intermediate shaft 3, and the first end bearing 5 is sheathed on the intermediate shaft 3. Moreover, the first end bearing 5 is provided at the other end of the intermediate shaft 3. It should be explained that one end of the intermediate shaft 3 may be the right end in FIG. 1, and the other end of the intermediate shaft 3 may be the left end in FIG. Therefore, the first end bearing 5 is provided at one end of the intermediate shaft 3 close to the working head 83. Among them, the first end bearing 5 can support the intermediate shaft 3, which can further improve the support strength of the support bearing 4, so that the shaking of the intermediate shaft 3 can be further reduced, and the stability of the intermediate shaft 3 can be improved.

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 at the first end bearing 5 and the intermediate shaft 3 away from the working head 83. Between one end, the support bearing 4 is arranged on the right side of the first end bearing 5, and the support bearing 4 and the first end bearing 5 are spaced apart, so that the support bearing 4 and the first end bearing 5 can be supported on the intermediate shaft. The different positions of 3 can improve the supporting effect of the intermediate shaft 3.

In some embodiments of the present invention, as shown in FIGS. 2 to 5, the electric hammer 10 may further include: a second end bearing 91 for supporting the intermediate shaft 3, the second end bearing 91 is sheathed on the intermediate shaft 3, and The second end bearing 91 is provided 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 part 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 plays a supporting role, which can further improve the support strength of the supporting bearing 4, so that the shaking of the intermediate shaft 3 can be further reduced, and the stability of the intermediate shaft 3 can be improved.

In some embodiments of the present invention, as shown in FIGS. 2 to 5, the gear mechanism includes a first gear portion 94 provided on the outer surface of the intermediate shaft 3, and a first gear portion 94 provided on the outer surface of the large cylinder 92 and connected to the first gear. When the intermediate shaft 3 is engaged with the second gear portion 95 meshed with the portion 94, the first gear portion 94 and the second gear portion 95 are meshed to achieve the working effect of driving the large cylinder 92 to rotate, thereby ensuring the rotation of the working head 83.

In some embodiments of the present invention, as shown in FIGS. 2 to 5, the motion conversion member 6 is selectively connected to the gear shaft 96, and the motion conversion member 6 works through the function conversion spline sleeve to provide reciprocating motion. When 3 is in the first position or the second position, the motion conversion member 6 can swing in the hammering position and the reset position. Wherein, the impact member 8 of the electric hammer 10 is connected to the motion conversion member 6, the ram 81 and the ram 82 are at least partially housed in the impact member 8, and the ram 82 is movably arranged between the ram 81 and the working head 83, The ram 81 is used to drive the ram 82 to hit the working head 83. Specifically, the motion conversion member 6 drives the reciprocating motion of the impact member 8 to generate air pressure between the ram 81 and pushes the ram 81 to generate a reciprocating impact movement. When the striker bar 82 is impacted during the movement, the striker bar 82 produces a reciprocating impact movement, and the striker bar 82 can transmit the reciprocating impact movement to the working head 83 to cause the working head 83 to produce an impact.

In some embodiments of the present invention, as shown in FIG. 2, the motion conversion member 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 member 6 is provided on the right side of the support bearing 4. Moreover, the motion conversion member 6 and the support bearing 4 are arranged spaced apart, so that the support bearing 4 and the motion conversion member 6 can be supported at different positions of the intermediate shaft 3, which can further improve the supporting effect of the intermediate shaft 3.

In some embodiments of the present invention, as shown in FIG. 2, the electric hammer 10 may further include: a locking device 7, which includes a locking portion 71 sleeved on the intermediate shaft 3, and the locking portion 71 is provided on 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 portion 71 is connected to the first gear portion 94 on the intermediate shaft 3, for example: the locking portion 71 and The first gear portion 94 is coupled to lock the intermediate shaft 3 in the fourth position. Among them, in the fourth position, the user can adjust the angle of the working head 83.

In some embodiments of the present invention, as shown in FIGS. 2 to 5, the locking portion 71 has a stopping portion 98 for stopping the first end bearing 5, and the stopping portion 98 abuts against the first end bearing 5. The first end bearing 5 can be installed on the housing 1 with interference. This arrangement can stop the first end bearing 5 on the housing 1 and prevent the first end bearing 5 from falling off from the housing 1. .

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 prolonging the service life of the support bearing 4, and thus The service life of the electric hammer 10 is prolonged, and at the same time, the shaking of the intermediate shaft 3 can be reduced.

In some embodiments of the present invention, the electric hammer 10 may further include: a position drive mechanism, the position drive mechanism is used to drive the intermediate shaft 3 to move to the first position, the second position, the third position, and the fourth position, so as to realize the driving The working purpose of the intermediate shaft 3 movement.

In some embodiments of the present invention, the position driving mechanism includes: a driving part 99 and a dial part (not shown in the figure) provided outside the housing 1. The driving part 99 is fixedly connected to the support bearing 4, because the support bearing 4 Connected with the intermediate shaft 3 without relative movement, the driving portion 99 can operatively 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 set as a shift fork, the driving part 99 is located in the housing 1, the shifting part is arranged on the housing 1 and is connected with the driving part 99, and the shifting part is moved by driving the driving part 99 to move the intermediate shaft 3 to The first position, the second position, the third position, the fourth position. Wherein, when the intermediate shaft 3 needs to be driven 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 dialing the toggle part.

The working mode of the electric hammer 10 of the present application is described below according to FIGS. 2 to 5:

The electric hammer also includes a first clutch mechanism and a second clutch mechanism, the first clutch mechanism is arranged between the motor shaft and the intermediate shaft 3, the second clutch mechanism is arranged between the motor shaft and the motion conversion member 6, the first clutch mechanism and The second clutch mechanism includes two states of separation and reception.

When the intermediate shaft 3 is in the first position, the first clutch mechanism is in a separated state, and the second clutch mechanism is in a receiving state. There is no motion transmission between the motor shaft and the intermediate shaft 3, and the motion conversion member 6 can receive the power of the motor shaft; When the intermediate shaft is in the second position, the first clutch mechanism and the second clutch structure are both in the receiving state, the intermediate shaft 3 can receive the power of the motor shaft, and the motion converter 6 can receive the power of the motor shaft; when the intermediate shaft 3 is in the third position In the position, the first clutch mechanism is in the receiving state, the second clutch mechanism is in the separated 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 member 6.

Further, the first clutch mechanism includes a gear shaft inner spline 961 of the gear shaft 96 and an intermediate shaft outer spline 31 of the intermediate shaft 3. When the gear shaft inner spline 961 meshes with the intermediate shaft outer spline 31, the first clutch The mechanism is in the receiving state. When the gear shaft inner spline 961 is disengaged from the intermediate shaft outer spline 31, the first clutch mechanism is in the disengaged state. The second clutch mechanism includes the gear shaft outer spline 962 of the gear shaft 96 and the motion conversion member inner spline 61 of the motion conversion member 6. When the gear shaft outer spline 962 meshes with the motion conversion member inner spline 61, the second clutch The mechanism is in the receiving state. When the gear shaft outer spline 962 is disengaged from the motion conversion member inner spline 61, the second clutch mechanism is in the disengaged state.

As shown in Figure 2, the hammer gear working mode: the toggle part drives the driving part 99 and the intermediate shaft 3 to move in the direction of the working head 83 to move the intermediate shaft 3 to the first position, the first clutch mechanism is in the separated state, and the gear shaft 96 The inner spline 961 of the gear shaft is disengaged from the outer spline 31 of the intermediate shaft 3 of the intermediate shaft. When the electric hammer 10 is working, the drive shaft of the motor 9 rotates, and the drive shaft of the motor 9 drives the gear shaft 96 to rotate. The gear shaft inner spline 961 of the gear shaft 96 is disengaged from the intermediate shaft outer spline 31. At this time, the motor 9 moves It cannot be transmitted to the intermediate shaft 3, and the intermediate shaft 3 cannot rotate. Therefore, the intermediate shaft 3 cannot drive the output shaft 93 to rotate, and the working head 83 cannot rotate. In addition, the second clutch mechanism is in the receiving state, the gear shaft outer splines 962 of the gear shaft 96 mesh with the inner splines 61 of the motion conversion member 6 of the motion conversion member 6, the gear shaft 96 drives the motion conversion member 6 to rotate, and the motion conversion member 6 drives The impact member 8 reciprocates, and the impact member 8 drives the ram 81 and the ram 82 to reciprocate, so that the ram 82 hits the drill bit 83, and the hammer gear working mode of the electric hammer 10 is realized.

In addition, as shown in Figure 5, when the electric hammer 10 is in the hammer working mode, the knob dialing part drives the driving part 99 and the intermediate shaft 3 to move to the working head 83, so that the intermediate shaft 3 moves to the fourth position, and the work can be adjusted. The angle of the head 83, at this time, the gear shaft internal spline 961 of the gear shaft 96 is disengaged from the intermediate shaft external spline 31 of the intermediate shaft 3, and the gear shaft external spline 962 meshes with the internal spline 61 of the motion conversion member, and the first gear The part 94 is engaged 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, which realizes the working effect of adjusting the angle of the working head 83 by the hammer. Gear).

As shown in Figure 3, the working mode of the hammer-drill gear: the rotary knob moves the driving part 99 and the intermediate shaft 3 to the motor 9 to move the intermediate shaft 3 to the second position. The first clutch mechanism and the second clutch mechanism are both In the receiving state, when the electric hammer 10 is working, the drive shaft of the motor 9 rotates, the drive shaft of the motor 9 drives the gear shaft 96 to rotate, the gear shaft internal spline 961 of the gear shaft 96 meshes with the intermediate shaft 3, and the gear shaft 96 drives the intermediate shaft 3 rotate, the first gear part 94 meshes with the second gear part 95, the intermediate shaft 3 drives the second gear part 95 and the large cylinder 92 to rotate, the large cylinder 92 and the output shaft 93 are connected by four steel pins, so the output shaft 93 follows The large cylinder 92 rotates together, and the output shaft 93 drives the working head 83 to rotate. At the same time, the gear shaft outer spline 962 of the gear shaft 96 meshes with the inner spline 61 of the motion conversion member 6 and the gear shaft 96 drives the motion conversion member 6 Rotating, the motion conversion member 6 drives the impact member 8 to reciprocate, and the impact member 8 drives the ram 81 and the ram 82 to reciprocate, so that the ram 82 hits the working head 83 to realize the hammer-drilling movement of the working head 83 of the electric hammer 10.

As shown in Figure 4, the working mode of the drill gear: the rotary knob moves the driving part 99 and the intermediate shaft 3 to the motor 9 to move the intermediate shaft 3 to the third position, the first clutch mechanism is in the receiving state, and the second clutch The mechanism is in a separated state, the gear shaft internal spline 961 of the gear shaft 96 meshes with the intermediate shaft external spline 31 of the intermediate shaft 3, and the gear shaft external spline 962 of the gear shaft 96 is engaged with the motion conversion member internal spline of the motion conversion member 6. 61 disengaged. When the electric hammer 10 is working, the drive shaft of the motor 9 rotates, and the drive shaft of the motor 9 drives the gear shaft 96 to rotate. The gear shaft internal spline 961 of the gear shaft 96 meshes with the intermediate shaft external spline 31 of the intermediate shaft 3, and the gear shaft 96 Drive the intermediate shaft 3 to rotate, the first gear portion 94 meshes with the second gear portion 95, the intermediate shaft 3 drives the second gear portion 95 and the large cylinder 92 to rotate, the large cylinder 92 and the output shaft 93 are connected by four steel pins, so the output The shaft 93 rotates together with the large cylinder 92, and the output shaft 93 drives the working head 83 to rotate. In addition, the gear shaft outer spline 962 of the gear shaft 96 is disengaged from the motion conversion member inner spline 61 of the motion conversion member 6, so the gear shaft 96 rotates, but the motion conversion member 6 does not rotate, and the impact member 8, the hammer 81, There is no reciprocating movement of the striker 82, which realizes the drilling movement of the working head 83 of the electric hammer 10.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

An electric hammer, including:

A motor, the motor rotates around the motor shaft;

The output shaft is used for mating with a working head, and the working head can selectively output rotation around an output axis and/or output reciprocating motion along the output axis;

A motion conversion mechanism, the motion conversion mechanism is used to receive the power of 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 the intermediate shaft A connected motion conversion member, the output shaft can be driven by the gear mechanism to output rotation, and the intermediate shaft can be selectively moved to a first position, a second position, and a third position along the direction of the intermediate shaft axis;

The impact mechanism includes an impact member for receiving the power of the motion conversion member and reciprocating along the output axis, and the impact member is used to drive the working head to reciprocate along the output axis; wherein the intermediate When the 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 the intermediate shaft moves to In the third position, the working head only outputs rotation;

It is characterized in that the electric hammer further includes a support mechanism that supports the impact member for reciprocating motion and a support bearing that supports the intermediate shaft, and when the intermediate shaft is in the third position, the support bearing and the support Institutional support abuts.
The electric hammer according to claim 1, wherein the support bearing is connected with the intermediate shaft without relative movement.
The electric hammer according to claim 2, further comprising a position driving mechanism, the position driving mechanism comprising a driving part fixedly connected to the support bearing, the driving part operatively driving the support bearing and The intermediate shaft moves along the axis of the intermediate shaft.
The electric hammer according to claim 1, wherein the first position, the second position, and the third position are sequentially arranged along the axis of the intermediate shaft, and when the intermediate shaft is in the first position and the second position , The supporting bearings all support and abut against the supporting mechanism.
The electric hammer according to claim 1, wherein the supporting mechanism comprises a supporting member and a bracket, the supporting member is arranged between the impact member and the bracket, and the supporting member and the bracket are not Connected in relative motion.
The electric hammer according to claim 5, wherein the bracket is an aluminum bracket.
The electric hammer according to claim 1, further comprising a first end bearing for supporting the intermediate shaft, the first end bearing is sleeved on the intermediate shaft, and the first end bearing is provided At one end of the intermediate shaft close to the working head.
The electric hammer according to claim 7, wherein the support bearing is located between the first end bearing and an end of the intermediate shaft away from the working head.
The electric hammer according to claim 1, further comprising a second end bearing for supporting the intermediate shaft, the second end bearing is sleeved on the intermediate shaft, and the second end bearing is provided On the end of the intermediate shaft away from the working head.
The electric hammer according to claim 7, further comprising: a locking portion sleeved on the intermediate shaft, the intermediate shaft having a fourth position along the axis of the intermediate shaft, the locking portion and the The intermediate shaft can be coupled to lock the intermediate shaft in the fourth position.
The electric hammer according to claim 10, wherein the locking portion has a stop portion for stopping the first end bearing, and the stop portion abuts against the first end bearing support .
The electric hammer according to claim 10, wherein when the intermediate shaft is in the fourth position, the support bearing is in support and abutment with the support mechanism.
The electric hammer according to claim 1, wherein the axis of the intermediate shaft is arranged in parallel with the axis of the output.
The electric hammer according to claim 1, wherein the output axis is parallel to the axis of the motor shaft.
The electric hammer according to claim 1, wherein the motion conversion member is provided with a swing rod bearing set on the intermediate shaft, the impact member is configured as an air cylinder, and the impact mechanism further includes A striker matched with a hammer and a striker rod matched with the striker, and the striker rod is used for mating with the working head.