CN113021272A - Electric hammer - Google Patents

Abstract

The invention discloses an electric hammer, comprising: a motor; the output shaft is used for being matched and connected with the working head; the motion conversion mechanism comprises a middle shaft, a gear mechanism and a motion conversion piece sleeved on the middle shaft, wherein the middle shaft can selectively move to a first position, a second position and a third position along the axis direction of the middle shaft; an impact mechanism including an impact member for receiving power of the motion conversion member and reciprocating along an output axis; the electric hammer also comprises a supporting mechanism for supporting the impact piece to do reciprocating motion and a supporting bearing for supporting the intermediate shaft, when the intermediate shaft is at the third position, the working head only outputs rotation, and the supporting bearing is supported and abutted against the supporting mechanism. From this, through supporting mechanism and supporting bearing cooperation, can guarantee that supporting bearing and supporting mechanism support together, can prevent supporting bearing inefficacy to can prolong supporting bearing's life, and then can prolong electric hammer's life.

Description

Electric hammer

Technical Field

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

Background

The electric hammer has a transmission device for switching between the working modes of drilling, impact drilling and chiseling. Wherein, when the electric hammer is at the drilling gear, fix the supporting bearing on the jackshaft and separate with supporting mechanism, play the effect that can not support the jackshaft, lead to the supporting bearing on the jackshaft to become invalid easily, also arouse the motion converting part to become invalid easily to influence the life of supporting bearing and motion converting part, and then influence the life of electric hammer.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the present invention is to propose an electric hammer which makes it possible to prolong the service life of the hammer.

The electric hammer according to the present invention comprises: a motor rotating around a motor shaft; the output shaft is used for being matched and connected with the working head, and the working head can selectively output rotation around the output axis and/or output reciprocating motion along the output axis; a motion conversion mechanism for receiving power of the motor, the motion conversion mechanism including an intermediate shaft, a gear mechanism that transmits power between the intermediate shaft and the output shaft, and a motion conversion member 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 in an axial direction thereof to a first position, a second position, and a third position; the impact mechanism comprises an impact piece which is used for receiving the power of the motion conversion piece and reciprocates along the output axis, and the impact piece is used for driving 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, and when the intermediate shaft moves to the third position, the working head only outputs rotation; the electric hammer further comprises a supporting mechanism for supporting the impact piece to do reciprocating motion and a supporting bearing for supporting the intermediate shaft, and when the intermediate shaft is at the third position, the supporting bearing is in supporting and abutting joint with the supporting mechanism.

According to the electric hammer, the supporting mechanism is matched with the supporting bearing, the supporting bearing and the supporting mechanism can be guaranteed to be supported together, the supporting bearing can be prevented from losing efficacy, the service life of the supporting bearing can be prolonged, and the service life of the electric hammer can be prolonged.

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

In some examples of the invention, the position drive mechanism further comprises a drive part fixedly connected with the support bearing, and the drive part is operable to drive the support bearing and the intermediate shaft to move along the axial direction of the intermediate shaft.

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

In some examples of the invention, the support mechanism includes a support and a bracket, the support being disposed between the striker and the bracket, the support being connected to the bracket without relative movement.

In some examples of the invention, the stent is an aluminum stent.

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 disposed at an end of the intermediate shaft close to the working head.

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

In some examples of the invention, the electric hammer further includes a second end bearing for supporting the intermediate shaft, the second end bearing is sleeved outside the intermediate shaft, and the second end bearing is arranged at one end of the intermediate shaft far away from the working head.

In some examples of the invention, the electric hammer further comprises: the locking part is sleeved on the intermediate shaft, the intermediate shaft is provided with a fourth position along the axis direction of the intermediate shaft, and the locking part is coupled with the intermediate shaft so as to lock the intermediate shaft at the fourth position.

In some examples of the present invention, the lock portion has a stopper portion for stopping the first end bearing, and the stopper portion is in supporting abutment with the first end bearing.

In some examples of the invention, the support bearing is in supporting abutment with the support mechanism when the intermediate shaft is in the fourth position.

In some examples of the invention, the countershaft axis is parallel to the output axis.

In some examples of the invention, the output axis is disposed parallel to an axis of the motor shaft.

In some examples of the present invention, the motion converter is provided with a swing rod bearing integrally provided on the intermediate shaft, the impact member is provided as a cylinder, and the impact mechanism further includes a striker cooperating with the impact member and a striker cooperating with the striker, and the striker is adapted to mate with the working head.

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.

Drawings

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

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

fig. 2 is a partially enlarged view of an intermediate shaft of the electric hammer according to the embodiment of the present invention in a first position;

fig. 3 is a partially enlarged view of the intermediate shaft of the electric hammer according to the embodiment of the present invention in the second position;

fig. 4 is a partially enlarged view of the intermediate shaft of the electric hammer according to the embodiment of the present invention at the third position;

fig. 5 is a partially enlarged view of the intermediate shaft of the electric hammer according to the embodiment of the present invention at the fourth position.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

An electric hammer 10 according to an embodiment of the present invention will be described with reference to fig. 1 to 5.

As shown in fig. 1 to 5, an electric hammer 10 according to an embodiment of the present invention includes: the device comprises a shell 1, a motor 9, an output shaft 93, a motion conversion mechanism and an impact mechanism. The motor 9 is arranged in the shell 1 of the electric hammer, the motor 9 provides electric energy for the work of the electric hammer 10, and the motor rotates around a motor shaft. The output shaft 93 is adapted to couple with the working head 83, and the working head 83 can selectively rotate around the output axis and/or reciprocate around the output axis, and it should be noted that the direction of the working axis (i.e. the output axis) refers to the left-right direction in fig. 1. The motion conversion mechanism is arranged in the shell 1, is used for receiving power of the motor 9, and can drive the output shaft 93 to rotate, so that the output shaft 93 drives the working head 83 to rotate, and comprises an intermediate shaft 3, a gear mechanism for transmitting power between the intermediate shaft 3 and the output shaft 93, and a motion conversion piece 6 which is sleeved on the intermediate shaft 3 and swings in a reciprocating mode. Wherein the intermediate shaft 3 is selectively connected with the motor 9, specifically, the output end of the motor 9 is provided with a gear shaft 96, the gear shaft 96 is selectively connected with the intermediate shaft 3 and/or the motion conversion member 6, the intermediate shaft 3 is selectively connected with the gear shaft 96, and the intermediate shaft 3 is selectively moved to the positions between the first position, the second position and the third position along the axial direction of the intermediate shaft 3, that is, the intermediate shaft 3 can be moved to any one of the first position, the second position and the third position in the axial direction of the intermediate shaft 3. Alternatively, the movement conversion element 6 is provided as a rocker bearing which is integrally arranged on the intermediate shaft 3.

And the impact mechanism comprises an impact piece 8 which is used for receiving the power transmitted by the motion conversion mechanism and reciprocates along the output axis, the impact piece 8 is used for driving the working head 83 to reciprocate along the output axis, when the intermediate shaft 3 moves to the first position, only the reciprocating motion is output by the working head 83, and the electric hammer 10 is in a 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 a hammer drill gear working 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 a drilling gear working mode.

In some embodiments of the invention, the impact member 8 is configured as a cylinder, and the impact mechanism further comprises a ram 81 engaged with the impact member 8 and a ram 82 engaged with the ram 81, the ram 82 being adapted to mate with the working head 83.

In some embodiments of the invention, the housing 1 is pistol-like and includes a main housing extending lengthwise along the output axis and a handle housing disposed obliquely at an angle to the main housing. Wherein 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 parallel to the output axis, and the axis of the motor shaft is parallel to the output axis, but the axis of the motor shaft may also be perpendicular to the output axis, which is not limited herein.

Further, the electric hammer 10 may further include a supporting mechanism 2 supporting the impact member 8 for reciprocating motion, and a supporting bearing 4 supporting the intermediate shaft 3, wherein when the intermediate shaft 3 is at the third position, the supporting bearing 4 is in supporting abutment with the supporting mechanism 2, specifically, the supporting mechanism 2 is sleeved on the outer side of the impact member 8, the inner ring of the supporting bearing 4 is sleeved on the intermediate shaft 3, and when the intermediate shaft 3 is at the third position, the supporting bearing 4 is in supporting abutment with the supporting mechanism 2.

In some embodiments of the present invention, the support bearing 4 is in supporting abutment with the support mechanism 2 when the intermediate shaft 3 is in the first position, and the support bearing 4 is in supporting abutment with the support mechanism 2 when the intermediate shaft 3 is in the second position, so as to ensure that the support bearing 4 is in supporting abutment with the support mechanism 2 at all times when the intermediate shaft 3 is in the first position, the second position, and the third position.

Wherein, the during operation of electric hammer 10, jackshaft 3 moves the in-process along its axis direction, can guarantee that support bearing 4 and supporting mechanism 2 support the butt each other together, and, electric hammer 10 is in drilling gear (drilling gear mode promptly), hammer drill gear mode, when hammering gear mode, support bearing 4 also can support the butt together with supporting mechanism 2, can guarantee the supporting effect to jackshaft 3, also can prevent support bearing 4 inefficacy, thereby can prolong support bearing 4's life, and then can prolong electric hammer 10's life, and simultaneously, can also reduce rocking of jackshaft 3, can reduce electric hammer 10's noise at work.

Therefore, through the matching of the supporting mechanism 2 and the supporting bearing 4, when the intermediate shaft 3 is at any one of the first position, the second position and the third position, the supporting bearing 4 and the supporting mechanism 2 can be supported and abutted together, and 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 further 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 disposed between the impact member 8 and the bracket 21, and the supporting member 22 is connected to the bracket 21 without relative movement.

In some embodiments of the present invention, as shown in fig. 2, the motion conversion mechanism may further include: the large cylinder 92 is sleeved on the outer side of the impact piece 8, the large cylinder 92 is connected with an output shaft 93, the large cylinder 92 and the intermediate shaft 3 are in meshing transmission through gears, the output shaft 93 is hollow, and the output shaft 93 is used for accommodating the working head 83. 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, the output shaft 93 is driven to rotate, so that the output shaft 93 drives the working head 83 to rotate. The supporting member 22 is sleeved on the outer side of the large cylinder 92, the support 21 is sleeved on the outer side of the supporting member 22, the supporting member 22 is connected with the support 21 without relative movement, and optionally, the support 21 and the supporting member are pressed together in an interference fit manner, so that the supporting mechanism 2 is arranged to stably support the large cylinder 92 in the shell 1, further support the impact member 8 to reciprocate in the large cylinder 92, and improve the working stability of the electric hammer 10.

In some embodiments of the invention, the support bearing 4 is connected with the intermediate shaft 3 without relative movement. Optionally, the support bearing 4 is in 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 at any one of the first position, the second position and the third position, the support bearing 4 is also located at the corresponding position, the intermediate shaft 3 and the support bearing 4 are located at any one of the positions, and the support bearing 4 and the support mechanism 2 are always supported and abutted.

In some embodiments of the invention, the support bearing 4 may also be connected for relative movement with the intermediate shaft 3. Optionally, the support bearing 4 is freely sleeved on the intermediate shaft 3, and the support bearing 4 is fixedly connected with the housing 1. At this time, the intermediate shaft 3 is moved to any one of the first position, the second position, and the third position, and the support bearing 4 is always in the same position and supported and abutted against the support mechanism 2.

In some embodiments of the present invention, the support mechanism 2 may be sleeved outside the outer ring of the support bearing 4, so that the support area of the support mechanism 2 and the support bearing 4 can be increased, the support strength for the support bearing 4 can be improved, the shaking of the intermediate shaft 3 can be further reduced, and the arrangement form of the support mechanism 2 can be more reasonable.

In some embodiments of the present invention, the support 21 may be an aluminum support, which can ensure the structural strength of the support mechanism 2, and when the support mechanism 2 is supported by the support bearing 4, the support mechanism 2 can be prevented from deforming, so that the intermediate shaft 3 can be prevented from moving in the direction perpendicular to the axial direction of the intermediate shaft 3, and further, the intermediate shaft 3 can be ensured to move only in the axial direction.

In some embodiments of the present invention, as shown in fig. 2-5, the electric hammer 10 may further include: the first end bearing 5 is used for supporting the intermediate shaft 3, the first end bearing 5 is sleeved on the intermediate shaft 3, and the first end bearing 5 is arranged at the other end of the intermediate shaft 3, it should be explained that one end of the intermediate shaft 3 can be the right end in fig. 1, the other end of the intermediate shaft 3 can be the left end in fig. 1, and it can also be understood that the first end bearing 5 is arranged at one end of the intermediate shaft 3 close to the working head 83. Wherein, first end bearing 5 can play the supporting role to jackshaft 3, can further promote the support intensity to support bearing 4 to can further reduce rocking of jackshaft 3, and then can promote jackshaft 3's stability.

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, and it is also understood that the support bearing 4 is located between the first end bearing 5 and one end of the intermediate shaft 3 far from the working head 83, the support bearing 4 is disposed at the right side of the first end bearing 5, and the support bearing 4 is disposed at a distance from the first end bearing 5, so that the support bearing 4 and the first end bearing 5 can be supported at different positions of the intermediate shaft 3, and the support effect on the intermediate shaft 3 can be improved.

In some embodiments of the present invention, as shown in fig. 2-5, the electric hammer 10 may further include: a second end bearing 91 for supporting jackshaft 3, second end bearing 91 overlaps in jackshaft 3, and second end bearing 91 sets up in the one end that jackshaft 3 kept away from working head 83, second end bearing 91 supports between the one end that working head 83 was kept away from to motion converting part 6 and jackshaft 3, second end bearing 91 can play the supporting role to jackshaft 3, can further promote the support intensity to support bearing 4, thereby can further reduce rocking of jackshaft 3, and then can promote jackshaft 3's stability.

In some embodiments of the present invention, as shown in fig. 2-5, the gear mechanism comprises 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 engaged with the first gear part 94, when the intermediate shaft 3 rotates, the first gear part 94 and the second gear part 95 are engaged to achieve the working effect of driving the large cylinder 92 to rotate, so that the working head 83 can be ensured to rotate.

In some embodiments of the present invention, as shown in fig. 2 to 5, the movement converting member 6 is selectively connected to the gear shaft 96, and the movement converting member 6 operates through the function converting spline housing to provide a reciprocating movement, and the movement converting member 6 is swingable between the hammering position and the reset position when the intermediate shaft 3 is located at the first position or the second position. The impact member 8 of the electric hammer 10 is connected with the motion conversion member 6, the ram 81 and the ram 82 are at least partially accommodated in the impact member 8, the ram 82 is movably arranged between the ram 81 and the working head 83, the ram 81 is used for driving the ram 82 to impact the working head 83, specifically, the motion conversion member 6 drives the impact member 8 to reciprocate and the ram 81 to generate air pressure to push the ram 81 to generate reciprocating impact motion, the ram 81 impacts the ram 82 during motion to enable the ram 82 to generate reciprocating impact motion, and the ram 82 can transmit the reciprocating impact motion to the working head 83 to enable the working head 83 to generate impact action.

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, and it is also understood that the motion conversion member 6 is disposed at the right side of the support bearing 4, and the motion conversion member 6 is disposed at a distance from the support bearing 4, such 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 enhance the supporting effect on the intermediate shaft 3.

In some embodiments of the present invention, as shown in fig. 2, the electric hammer 10 may further include: the locking device 7, the locking device 7 include the locking portion 71 that is located the jackshaft 3, and the locking portion 71 is located in the casing 1, and the jackshaft 3 has the fourth position along its axial direction, and when the jackshaft 3 moved to the fourth position, the locking portion 71 was connected with the first gear portion 94 on the jackshaft 3, for example: the locking portion 71 is coupled with the first gear portion 94, and can lock the intermediate shaft 3 at the fourth position. Wherein 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 fig. 2 to 5, the locking portion 71 has a stopping portion 98 for stopping the first end bearing 5, and the stopping portion 98 is in abutting fit with the first end bearing 5, wherein since the first end bearing 5 can be interference-mounted on the housing 1, the arrangement can stop the first end bearing 5 on the housing 1, and the first end bearing 5 can be prevented 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, so as to prevent the support bearing 4 from failing, thereby prolonging the service life of the support bearing 4, further prolonging the service life of the electric hammer 10, and simultaneously reducing the shaking of the intermediate shaft 3.

In some embodiments of the present invention, the electric hammer 10 may further include: and the position driving mechanism is used for driving the intermediate shaft 3 to move to the first position, the second position, the third position and the fourth position, so that the aim of driving the intermediate shaft 3 to move is fulfilled.

In some embodiments of the invention, the position drive mechanism comprises: a driving part 99 and a toggle part (not shown) disposed outside the housing 1, wherein the driving part 99 is fixedly connected with the support bearing 4, and the driving part 99 is operable to drive the support bearing 4 and the intermediate shaft 3 to move along the axial direction of the intermediate shaft because the support bearing 4 is connected with the intermediate shaft 3 without relative movement. The driving portion 99 can be set up to the shift fork, and the driving portion 99 is located casing 1, and the shift portion sets up on casing 1 and is connected with driving portion 99, and the shift portion moves so that jackshaft 3 moves to first position, second position, third position, fourth position through drive driving portion 99. When the intermediate shaft 3 needs to be driven to move, a user can control the driving portion 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 portion.

The mode of operation of the hammer 10 of the present application is described below with respect to fig. 2-5:

the electric hammer further comprises 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 part 6, and the first clutch mechanism and the second clutch mechanism are in a separating state and a receiving state.

When the intermediate shaft 3 is located at the first position, the first clutch mechanism is in a separated state, the second clutch mechanism is in a receiving state, no motion transmission exists between the motor shaft and the intermediate shaft 3, and the motion conversion part 6 can receive the power of the motor shaft; when the intermediate shaft is located at the second position, the first clutch mechanism and the second clutch mechanism are both in a receiving state, the intermediate shaft 3 can receive the power of the motor shaft, and the motion conversion part 6 can receive the power of the motor shaft; when the intermediate shaft 3 is located at the third position, the first clutch mechanism is in a receiving state, the second clutch mechanism is in a separating state, the intermediate shaft 3 can receive the power of the motor shaft, and no motion transmission exists between the motor shaft and the motion conversion part 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, and is in a receiving state when the gear shaft inner spline 961 is engaged with the intermediate shaft outer spline 31, and is in a disengaged state when the gear shaft inner spline 961 is disengaged from the intermediate shaft outer spline 31. The second clutch mechanism includes a gear shaft external spline 962 of the gear shaft 96 and a movement converting member internal spline 61 of the movement converting member 6, and is in a receiving state when the gear shaft external spline 962 is engaged with the movement converting member internal spline 61, and is in a disengaged state when the gear shaft external spline 962 is disengaged from the movement converting member internal spline 61.

As shown in fig. 2, hammer stage operation mode: the toggle part drives the driving part 99 and the intermediate shaft 3 to move towards the direction of the working head 83, so that the intermediate shaft 3 moves to the first position, the first clutch mechanism is in a separated state, and 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. When the electric hammer 10 works, the driving shaft of the motor 9 rotates, the driving shaft of the motor 9 drives the gear shaft 96 to rotate, the gear shaft internal spline 961 of the gear shaft 96 is separated from the intermediate shaft external spline 31, at the moment, the motion of the motor 9 cannot be transmitted to the intermediate shaft 3, the intermediate shaft 3 cannot rotate, the intermediate shaft 3 cannot drive the output shaft 93 to rotate, and the working head 83 cannot rotate. And, the second clutch mechanism is in a receiving state, the gear shaft external spline 962 of the gear shaft 96 is meshed with the motion converter 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 piece 8 to reciprocate, the impact piece 8 drives the ram 81 and the ram 82 to reciprocate, so that the ram 82 impacts the drill bit 83, and the hammer gear working mode of the electric hammer 10 is realized.

In addition, as shown in fig. 5, when the electric hammer 10 is in the hammer shift operating mode, the knob toggle part drives the driving part 99 and the intermediate shaft 3 to move towards the working head 83, so that the intermediate shaft 3 moves to the fourth position, the angle of the working head 83 can be adjusted, 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, the gear shaft external spline 962 is engaged with the motion converter internal spline 61, the first gear 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, so that the angle of the working head 83 can be manually adjusted, and the working effect (transition gear) of adjusting the angle of the.

As shown in fig. 3, hammer gear mode of operation: the knob toggle part drives the driving part 99 and the intermediate shaft 3 to move towards the motor 9, so that the intermediate shaft 3 moves to the second position, the first clutch mechanism and the second clutch mechanism are both in a receiving state, when the electric hammer 10 works, the driving shaft of the motor 9 rotates, the driving shaft of the motor 9 drives the gear shaft 96 to rotate, the gear shaft internal spline 961 of the gear shaft 96 is meshed with the intermediate shaft 3, the gear shaft 96 drives the intermediate shaft 3 to rotate, the first gear part 94 is meshed 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 is connected with the output shaft 93 through four steel pins, so that the output shaft 93 rotates along with the large cylinder 92, the output shaft 93 drives the working head 83 to rotate, meanwhile, the gear shaft external spline 962 of the gear shaft 96 is meshed with the movement conversion part internal spline 61 of the movement conversion part 6, the movement conversion part 6 drives the impact part 8 to reciprocate, the impact member 8 drives the ram 81 and the ram 82 to reciprocate, so that the ram 82 impacts the working head 83, and the working head 83 of the electric hammer 10 performs hammer drill motion.

As shown in fig. 4, the drill level operation mode: the knob toggle part drives the driving part 99 and the intermediate shaft 3 to move towards the motor 9, so that the intermediate shaft 3 moves to the third position, the first clutch mechanism is in a receiving state, the second clutch mechanism is in a separating state, the gear shaft internal spline 961 of the gear shaft 96 is meshed 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 disengaged from the motion conversion piece internal spline 61 of the motion conversion piece 6. When the electric hammer 10 works, the driving shaft of the motor 9 rotates, the driving shaft of the motor 9 drives the gear shaft 96 to rotate, the gear shaft internal spline 961 of the gear shaft 96 is meshed with the intermediate shaft external spline 31 of the intermediate shaft 3, the gear shaft 96 drives the intermediate shaft 3 to rotate, the first gear part 94 is meshed 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 is connected with the output shaft 93 through 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. Further, since the gear shaft external spline 962 of the gear shaft 96 is disengaged from the motion converter internal spline 61 of the motion converter 6, the gear shaft 96 rotates, but the motion converter 6 does not rotate, and the impact member 8, the hammer 81, and the striker 82 do not reciprocate, thereby achieving the shift movement of the working head 83 of the hammer 10.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. An electric hammer comprising:

a motor rotating around a motor shaft;

the output shaft is used for being matched and connected with the working head, and the working head can selectively output rotation around the output axis and/or output reciprocating motion along the output axis;

a motion conversion mechanism for receiving power of the motor, the motion conversion mechanism including an intermediate shaft, a gear mechanism that transmits power between the intermediate shaft and the output shaft, and a motion conversion member connected to the intermediate shaft, the output shaft being capable of being driven to rotate by the gear mechanism, the intermediate shaft being selectively movable in an intermediate shaft axis direction to a first position, a second position, and a third position;

the impact mechanism comprises an impact piece which is used for receiving the power of the motion conversion piece and reciprocates along the output axis, and the impact piece is used for driving 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, and when the intermediate shaft moves to the third position, the working head only outputs rotation;

the electric hammer is characterized by further comprising a supporting mechanism for supporting the impact piece to reciprocate and a supporting bearing for supporting the intermediate shaft, wherein when the intermediate shaft is at the third position, the supporting bearing is in supporting and abutting joint with the supporting mechanism.

2. An electric hammer according to claim 1, wherein the support bearing is connected with the intermediate shaft without relative movement.

3. The electric hammer of claim 2, further comprising a position drive mechanism including a drive portion fixedly connected to the support bearing, the drive portion being operable to drive the support bearing and the intermediate shaft in a direction along the axis of the intermediate shaft.

4. The electric hammer according to claim 1, wherein the first position, the second position, and the third position are arranged in this order along the axis of the intermediate shaft, and the support bearing is in supporting abutment with the support mechanism when the intermediate shaft is in the first position and the second position.

5. An electric hammer according to claim 1, wherein the support mechanism includes a support member and a bracket, the support member being disposed between the impact member and the bracket, the support member being connected to the bracket without relative movement.

6. An electric hammer according to claim 5, wherein the bracket is an aluminum bracket.

7. The electric hammer of claim 1, further comprising a first end bearing for supporting the intermediate shaft, the first end bearing being sleeved on the intermediate shaft and disposed at an end of the intermediate shaft adjacent to the working head.

8. The electric hammer of claim 7, wherein the support bearing is located between the first end bearing and an end of the intermediate shaft distal from the working head.

9. The hammer of claim 1 further comprising a second end bearing for supporting the intermediate shaft, the second end bearing being externally received by the intermediate shaft and disposed at an end of the intermediate shaft remote from the working head.

10. The electric hammer of claim 7, further comprising: the locking portion of jackshaft is located to the cover, the jackshaft has the fourth position along the jackshaft axis direction, locking portion with the jackshaft can the coupling, in order will the jackshaft locks in the fourth position.

11. The electric hammer according to claim 10, wherein the lock portion has a stopper portion for stopping the first end bearing, the stopper portion being in supporting abutment with the first end bearing.

12. The electric hammer of claim 10, wherein the support bearing is in supporting abutment with a support mechanism when the intermediate shaft is in the fourth position.

13. The electric hammer of claim 1, wherein the intermediate shaft axis is disposed parallel to the output axis.

14. The electric hammer of claim 1, wherein the output axis is disposed parallel to an axis of the motor shaft.

15. The electric hammer according to claim 1, wherein the motion converting member is provided with a swing rod bearing integrally provided on the intermediate shaft, the impact member is provided with a cylinder, the impact mechanism further comprises a striker cooperating with the impact member and a striker cooperating with the striker, and the striker is adapted to mate with the working head.

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