Mini electric hammer

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to a mini electric hammer. The mini electric hammer comprises a shell, an adjusting assembly, a power transmission assembly and an impact rotating assembly, wherein the power transmission assembly and the impact rotating assembly are arranged in the shell; the power transmission assembly comprises a gear shaft, a clutch gear sleeve, a swing rod bearing and a motor, the clutch gear sleeve moves along the gear shaft and can be in transmission connection with an inner ring of the bearing, and the motor is used for driving the gear shaft to rotate; the impact rotating assembly comprises a rammer, an air cylinder body and a rotating sleeve, the rotating sleeve can reciprocate in the axial direction, the axial movement of the rotating sleeve can drive a clutch gear sleeve to move, and the rotation of the clutch gear sleeve can drive the rotating sleeve to rotate; the limiting pin is close to the rotating sleeve and can abut against the rotating sleeve so that the clutch gear sleeve can be away from the bearing inner ring. When the limiting pin is far away from the rotating sleeve, the rotating sleeve can drive the clutch gear sleeve to move along the gear shaft, so that the clutch gear sleeve and the bearing inner ring are in meshing transmission. According to the technical scheme, the mini electric hammer is simple in structure and high in mode switching precision.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric tool technical field, concretely relates to a mini electric hammer. BACKGROUND

[0002] Electric hammer is a kind of electric tool that can drive drill bit to rotate and reciprocating hammering. Because the drill bit of electric hammer rotates and also produces rapid reciprocating movement along the direction of electric drill rod (frequent impact), it can quickly punch holes in brittle cement concrete and stone materials. According to specific use needs, the electric hammer can be in different working modes by using the change-over switch.

[0003] The electric hammer in prior art usually sets mode adjusting component on the side of overall structure, which leads to complex internal structure, large structure volume, difficult miniaturization, and further, low mode switching precision, causing inconvenience to users.

[0004] Therefore, it is urgent to provide a mini electric hammer with simple structure and high mode switching precision to solve the above problems. SUMMARY

[0005] The utility model aims at at least solving the problem of how to simplify mini electric hammer to improve mode switching precision. The utility model realizes the purpose by the following technical scheme:

[0006] The utility model discloses a mini electric hammer, comprising:

[0007] The utility model discloses a mini electric hammer, comprising:

[0008] The power transmission assembly comprises a gear shaft, a clutch gear sleeve, a swing lever bearing and a motor, the swing lever bearing comprises a bearing inner ring and a bearing outer ring connected in transmission, the bearing inner ring is rotatably sleeved on the gear shaft, the clutch gear sleeve is movably sleeved on the gear shaft and is connected with the gear shaft in transmission, the clutch gear sleeve is connected with the bearing inner ring in transmission by moving along the gear shaft, and the motor is used to drive the gear shaft to rotate.

[0009] The impact rotating assembly comprises a hammer, a cylinder body and a rotating sleeve, the hammer is slidably arranged in the interior of the cylinder body, the cylinder body is reciprocatingly movably arranged in the interior of the rotating sleeve, the cylinder body is connected with the bearing outer ring, the rotating sleeve can reciprocate along the axial direction, the rotating sleeve can drive the clutch gear sleeve to move by axial movement, and the clutch gear sleeve can drive the rotating sleeve to rotate by rotation.

[0010] The adjusting assembly comprises a limiting pin, the shell is provided with an avoiding hole, the limiting pin is arranged on the shell along the radial direction of the rotating sleeve and can move along the radial direction of the rotating sleeve;

[0011] The limiting pin is close to the rotating sleeve and can abut against the rotating sleeve, so that the clutching gear sleeve is away from the bearing inner ring; when the limiting pin is away from the rotating sleeve, the rotating sleeve can drive the clutching gear sleeve to move along the gear shaft, so that the clutching gear sleeve and the bearing inner ring are in transmission connection.

[0012] The mini electric hammer has a drilling mode and a hammer drilling mode. When the mini electric hammer needs to work in the drilling mode, an operator can insert the limiting pin into the interior of the shell along the avoiding hole so that the limiting pin abuts against the rotating sleeve. In this case, the operator holds the mini electric hammer and abuts the tool head against a machining surface. Since the limiting pin blocks the rotating sleeve, the rotating sleeve cannot move backward, so that the clutching gear sleeve and the bearing inner ring are away from each other. After the motor is started, the motor drives the gear shaft to rotate, the gear shaft drives the clutching gear sleeve to rotate, the clutching gear sleeve can only drive the rotating sleeve to rotate but cannot drive the bearing inner ring to rotate, and the mini electric hammer only has the drilling function. When the mini electric hammer needs to work in the hammer drilling mode, the operator can make the limiting pin away from the rotating sleeve. In this case, the operator holds the mini electric hammer and abuts the tool head against the machining surface. The rotating sleeve drives the clutching gear sleeve to move backward, and then the clutching gear sleeve and the bearing inner ring are in transmission connection. After the motor is started, the motor drives the gear shaft to rotate, the gear shaft drives the clutching gear sleeve to rotate, the clutching gear sleeve not only drives the rotating sleeve to rotate but also drives the bearing inner ring to rotate, and then the bearing outer ring drives the cylinder body to reciprocate, so that the hammer performs the impact action. Therefore, the mini electric hammer has the hammer drilling function. In summary, the mini electric hammer provided by the technical scheme has a simple structure and convenient mode switching. The mode switching only needs to move the limiting pin. The limiting pin can effectively block the rotating movement in the drilling mode and can not affect the movement of the rotating sleeve in the hammer drilling mode, so that the precise switching of different modes is realized, and the working efficiency is improved.

[0013] In addition, the mini electric hammer can have the following additional technical features.

[0014] In some embodiments of the utility model, the adjusting assembly further comprises an adjusting part, the projection of the adjusting part on the shell does not coincide with the projection of the gear shaft on the shell, the adjusting part is located at the end of the shell away from the motor, the adjusting part is rotatably sleeved on the outside of the shell, the inner ring of the adjusting part is provided with an avoiding groove and a pressing protrusion, the pressing protrusion and the avoiding groove are arranged along the circumferential direction of the adjusting part, the avoiding groove is used for accommodating the end of the limiting pin away from the rotating sleeve, and the pressing protrusion is used for making the limiting pin close to the rotating sleeve and abut against the rotating sleeve.

[0015] In some embodiments of the utility model, the avoiding groove and the pressing protrusion are connected through the inclined surface transition.

[0016] In some embodiments of the utility model, the spring is arranged on the limiting pin, and the restoring force of the spring can drive the limiting pin to move away from the rotating sleeve.

[0017] In some embodiments of the utility model, the inner wall of the shell is connected with a guide sleeve, the bottom of the limiting pin is arranged in the guide sleeve, the top of the limiting pin is provided with an anti-dropping part, the top of the spring abuts against the anti-dropping part, and the bottom of the spring abuts against the guide sleeve.

[0018] In some embodiments of the utility model, the outer ring of the rotating sleeve is provided with a limiting ring rib, and the limiting ring rib is used for abutting against the limiting pin.

[0019] In some embodiments of the utility model, the clutch gear sleeve comprises a gear sleeve part, the inner wall of the gear sleeve part is provided with an internal gear, the bearing inner ring comprises a transmission part, the transmission part is provided with an external gear, the clutch gear sleeve is close to the bearing inner ring, the gear sleeve part can be sleeved on the transmission part, so that the internal gear and the external gear are engaged and driven.

[0020] In some embodiments of the utility model, the clutch gear sleeve further comprises a primary transmission gear connected with the gear sleeve part, a secondary transmission gear is sleeved on the rotating sleeve, and the secondary transmission gear is in transmission connection with the primary transmission gear.

[0021] In some embodiments of the utility model, the primary transmission gear and the gear shaft are coupled through the spline.

[0022] In some embodiments of the utility model, the impact rotating assembly further comprises a push plate sleeved on the rotating sleeve, and the clutch gear sleeve and the rotating sleeve are connected through the push plate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present utility model. Moreover, the same reference numerals in the various drawings indicate the same or similar elements. In the drawings:

[0024] Figure 1 The structure schematic diagram of the mini electric hammer according to the embodiments of the utility model is schematically shown;

[0025] Figure 2 The sectional schematic diagram of the mini electric hammer according to the embodiments of the utility model is schematically shown Figure One ;

[0026] Figure 3 A cross-sectional view of a mini electric hammer is schematically shown according to an embodiment of the present application Figure Two ;

[0027] Figure 4 A cross-sectional view of a mini electric hammer is schematically shown according to an embodiment of the present application Figure Three ;

[0028] Figure 5 A structure view of an adjusting part is schematically shown according to an embodiment of the present application

[0029] Figure 6 A partial structure view of a mini electric hammer is schematically shown according to an embodiment of the present application Figure One ;

[0030] Figure 7 A partial structure view of a mini electric hammer is schematically shown according to an embodiment of the present application Figure Two ;

[0031] Figure 8 A structure view of a clutch sleeve is schematically shown according to an embodiment of the present application

[0032] Figure 9 A structure view of a push plate is schematically shown according to an embodiment of the present application

[0033] The reference signs in the drawings represent the following:

[0034] 100, housing; 110, avoiding hole; 120, mark;

[0035] 200, power transmission assembly; 210, toothed shaft; 220, clutch sleeve; 221, sleeve part; 222, primary transmission gear; 223, clamping groove; 230, swing lever bearing; 231, bearing inner ring; 231a, inner ring body; 231b, transmission part; 232, bearing outer ring; 232a, outer ring body; 232b, swing lever; 240, motor; 250, driving gear; 260, driven gear;

[0036] 300, impact rotation assembly; 310, hammer; 320, cylinder body; 330, rotating sleeve; 331, limiting ring rib; 340, push plate; 341, sleeve ring; 342, clamping part; 350, secondary transmission gear; 360, impact lever;

[0037] 400, adjusting assembly; 410, limiting pin; 411, anti-dropping part; 420, adjusting part; 421, pressing protrusion; 422, avoiding groove; 423, inclined surface; 424, protrusion part; 430, spring; 440, guide sleeve. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure can be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are to be construed to be inclusive (i.e., to include both instances of open ended terms and instances of terms limiting to a specific number) unless otherwise indicated as otherwise limited by context. The methods described herein can be implemented as a method, an apparatus, a system, a computer program product, computer-readable medium, computer program, or a combination thereof.

[0040] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0041] For ease of description, spatial relative terms can be used herein to describe a relationship of one element or feature to another element or feature as shown in the drawings, such as "inner", "outer", "inside", "outside", "lower", "below", "upper", "above", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as "below" or "beneath" the other element or feature would then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The embodiments of the present application can include various steps, or techniques. The steps, or techniques can be interchanged with one another without departing from the scope of the present application.

[0042] Figure 1 A structural schematic diagram of a mini electric hammer according to the embodiments of the present application is schematically shown, Figure 2 A sectional schematic diagram of a mini electric hammer according to the embodiments of the present application is schematically shown Figure One , Figure 3 A sectional schematic diagram of a mini electric hammer according to the embodiments of the present application is schematically shown Figure Two . As Figures 1 to 3 shown, the present application provides a mini electric hammer, comprising a shell 100, an adjusting assembly 400, a power transmission assembly 200 and an impact rotating assembly 300, the power transmission assembly 200 and the impact rotating assembly 300 are arranged inside the shell 100; the power transmission assembly 200 comprises a gear shaft 210, a clutch gear sleeve 220, a swing lever bearing 230 and a motor 240, the swing lever bearing 230 comprises a bearing inner ring 231 and a bearing outer ring 232 which are in transmission connection, the bearing inner ring 231 is rotatably sleeved on the gear shaft 210, the clutch gear sleeve 220 is movably sleeved on the gear shaft 210 and the clutch gear sleeve 220 and the gear shaft 210 are in transmission connection, the clutch gear sleeve 220 is movable along the gear shaft 210 and can be in transmission connection with the bearing inner ring 231, the motor 240 is used for driving the gear shaft 210 to rotate; the impact rotating assembly 300 comprises a hammer 310, a cylinder body 320 and a rotating sleeve 330, the hammer 310 is slidably arranged inside the cylinder body 320, the cylinder body 320 is reciprocally movably arranged inside the rotating sleeve 330, the cylinder body 320 is connected with the bearing outer ring 232, the rotating sleeve 330 is axially reciprocally movable, the rotating sleeve 330 is axially movable to drive the clutch gear sleeve 220 to move, the clutch gear sleeve 220 is rotatable to drive the rotating sleeve 330 to rotate; a limiting pin 410 is close to the rotating sleeve 330 and can abut against the rotating sleeve 330, so as to make the clutch gear sleeve 220 away from the bearing inner ring 231; when the limiting pin 410 is away from the rotating sleeve 330, the rotating sleeve 330 can drive the clutch gear sleeve 220 to move along the gear shaft 210, so as to make the clutch gear sleeve 220 and the bearing inner ring 231 in transmission connection.

[0043] The mini electric hammer has a drilling mode and a hammer drilling mode. When the mini electric hammer needs to work in the drilling mode, the limiting pin 410 is inserted into the interior of the shell 100 along the avoiding hole 110 so that the limiting pin 410 and the rotating sleeve 330 abut against each other, in this case, the operator holds the mini electric hammer and presses the tool head against a processing surface, the rotating sleeve 330 cannot move backward due to the blocking of the limiting pin 410, so the clutch tooth sleeve 220 and the bearing inner ring 231 are away from each other. After the motor 240 is started, the motor 240 drives the gear shaft 210 to rotate, the gear shaft 210 drives the clutch tooth sleeve 220 to rotate, the clutch tooth sleeve 220 can only drive the rotating sleeve 330 to rotate but cannot drive the bearing inner ring 231 to rotate, and the mini electric hammer only has the drilling function. When the mini electric hammer needs to work in the hammer drilling mode, the limiting pin 410 is away from the rotating sleeve 330, in this case, the operator holds the mini electric hammer and presses the tool head against a processing surface, the rotating sleeve 330 drives the clutch tooth sleeve 220 to move backward, and then the clutch tooth sleeve 220 and the bearing inner ring 231 are in transmission connection. After the motor 240 is started, the motor 240 drives the gear shaft 210 to rotate, the gear shaft 210 drives the clutch tooth sleeve 220 to rotate, the clutch tooth sleeve 220 not only drives the rotating sleeve 330 to rotate but also drives the bearing inner ring 231 to rotate, and then the bearing outer ring 232 drives the cylinder body 320 to reciprocate, so that the hammer 310 performs the impact action, and thus the mini electric hammer has the hammer drilling function. In summary, the mini electric hammer provided by the technical scheme has a simple structure and convenient mode switching, only the movement of the limiting pin 410 is needed. The limiting pin 410 can effectively block the rotating movement in the drilling mode and can not affect the movement of the rotating sleeve 330 in the hammer drilling mode, precise switching of different modes is realized, and the working efficiency is improved.

[0044] Optionally, the hammer 310 is provided with a percussion rod 360 at the front end, the percussion rod 360 is used for installing a tool head (not shown in the figure), in the hammer drilling mode, the reciprocating movement of the cylinder body 320 can drive the hammer 310 to hammer the percussion rod 360, and then the tool head moves forward and backward. Optionally, the output end of the motor 240 is connected with a driving gear 250, and a driven gear 260 is arranged on the gear shaft 210, when the motor 240 is started, the driving gear 250 and the driven gear 260 are in meshing transmission.

[0045] Further, Figure 4 The structure schematic diagram of the adjusting part 420 according to the embodiment of the utility model is schematically shown. Figure 5 The sectional schematic diagram of the mini electric hammer according to the embodiment of the utility model is schematically shown Figure Three . Referring to Figures 1 to 5The adjusting assembly 400 further comprises an adjusting part 420, a projection of the adjusting part 420 on the shell 100 does not coincide with a projection of the pinion shaft 210 on the shell 100, and the adjusting part 420 is located at an end of the shell 100 away from the motor 240. The adjusting part 420 is rotatably sleeved outside the shell 100. An inner ring of the adjusting part 420 is provided with a pressing protrusion 421 and an avoiding groove 422. The pressing protrusion 421 and the avoiding groove 422 are arranged along a circumferential direction of the adjusting part 420. The avoiding groove 422 is used for accommodating an end of the limiting pin 410 away from the rotating sleeve 330. The pressing protrusion 421 is used for moving the limiting pin 410 close to the rotating sleeve 330 and abutting against the rotating sleeve 330.

[0046] Optionally, the adjusting part 420 is in a ring structure and is located at a front end of the rotating sleeve 330. By rotating the adjusting part 420, the switching of the working mode can be realized, and the operation is very convenient. For example, when the pressing protrusion 421 and the top of the limiting pin 410 are in contact, the limiting pin 410 is moved to the direction close to the rotating sleeve 330 under the pressure of the pressing protrusion 421 and abuts against the rotating sleeve 330, thereby preventing the rotating sleeve 330 from moving to the rear end of the mini electric hammer. When the avoiding groove 422 and the limiting pin 410 are opposite to each other, the top of the limiting pin 410 extends into the avoiding groove 422, thereby avoiding the contact between the limiting pin 410 and the rotating sleeve 330, and the rotating sleeve 330 can move axially.

[0047] Optionally, the number of the limiting pins 410 can be one or more. In the embodiment, the number of the limiting pins 410 is three, and the three limiting pins 410 are equidistantly distributed along the outer periphery of the rotating sleeve 330. In other embodiments, the number of the limiting pins 410 can also be one, two, four or five, etc. By arranging multiple limiting pins 410, the force when the limiting pin 410 and the rotating sleeve 330 abut against each other can be effectively dispersed. Correspondingly, the number and position of the avoiding grooves 422 are arranged according to the number and position of the limiting pins 410, so as to ensure that the avoiding grooves 422 and the limiting pins 410 correspond to each other. The adjusting part 420 forms a protruding part 424 outside the position where the avoiding groove 422 is located. The protruding part 424 can prompt the user to avoid the position where the avoiding groove 422 is located, so that the user knows whether the adjusting part 420 is rotated to the position. It can be understood that the pressing protrusions 421 are formed between the adjacent avoiding grooves 422, and the height between the end surface of the pressing protrusion 421 and the groove bottom of the avoiding groove 422 is arranged according to the distance that the limiting pin 410 needs to move. Optionally, at least one mark 120 is arranged on the side surface of the shell 100, and the mark 120 corresponds to the position of the limiting pin 410, so that when the protruding part 424 is opposite to the mark 120, the avoiding groove 422 is opposite to the limiting pin 410, that is, the mini electric hammer is in the hammer drill mode.

[0048] Further, referring to Figure 4The avoiding groove 422 and the pressing protrusion 421 are connected by the inclined surface 423.

[0049] That is, the side wall and the groove bottom of the avoiding groove 422 are at an obtuse angle, so as to facilitate the rotation of the adjusting part 420 and prevent the adjusting part 420 and the limiting pin 410 from being stuck.

[0050] Further, referring to Figure 5 The spring 430 is sleeved on the limiting pin 410, and the restoring force of the spring 430 can move the limiting pin 410 away from the rotating sleeve 330.

[0051] By arranging the spring 430 on the limiting pin 410, when the top of the limiting pin 410 enters the avoiding groove, the spring 430 can push the limiting pin 410 to move upward, so as to separate the limiting pin 410 and the rotating sleeve 330, and keep the limiting pin 410 away from the rotating sleeve 330.

[0052] Further, the inner wall of the shell 100 is connected with a guide sleeve 440, the bottom of the limiting pin 410 is arranged in the guide sleeve 440, the top of the limiting pin 410 is provided with an anti-dropping part 411, the top of the spring 430 and the anti-dropping part 411 are in abutment, and the bottom of the spring 430 and the guide sleeve 440 are in abutment.

[0053] It can be understood that the guide sleeve 440 plays a guiding role in the movement of the limiting pin 410, and can limit the spring 430. Optionally, the guide sleeve 440 is embedded in the inner wall of the shell 100 to save the occupation of the internal space of the shell 100. Optionally, the top of the anti-dropping part 411 is a dome, which can facilitate the rotation of the adjusting part 420 and prevent the adjusting part 420 and the limiting pin 410 from being stuck.

[0054] Further, Figure 6 The partial structure schematic diagram of the mini electric hammer is schematically shown according to the embodiment of the utility model, Figure One Referring to Figure 6 The outer circle of the rotating sleeve 330 is provided with a limiting ring rib 331, and the limiting ring rib 331 is used for abutting against the limiting pin 410.

[0055] When the mini electric hammer is in the drilling mode, the limiting ring rib 331 is located in front of the limiting pin 410, so that when the tool head contacts the machining surface, the limiting pin 410 can block the limiting ring from moving backward.

[0056] Further, Figure 7 The partial structure schematic diagram of the mini electric hammer is schematically shown according to the embodiment of the utility model, Figure 8 The structure schematic diagram of the clutch tooth sleeve 220 is schematically shown according to the embodiment of the utility model. Referring to Figures 6 to 8The clutching gear sleeve 220 comprises a gear sleeve part 221, the inner wall of the gear sleeve part 221 is provided with an internal gear, the bearing inner ring 231 comprises a transmission part 231b, the transmission part 231b is provided with an external gear, and the clutching gear sleeve 220 is close to the bearing inner ring 231 so that the gear sleeve part 221 is sleeved on the transmission part 231b to make the internal gear and the external gear meshing transmission.

[0057] As described above, the gear shaft 210 and the clutching gear sleeve 220 are in transmission connection, so when the transmission part 231b of the clutching gear sleeve 220 is sleeved on the transmission part 231b of the bearing inner ring 231, the gear shaft 210 rotates to drive the clutching gear sleeve 220 to rotate, and the clutching gear sleeve 220 rotates to drive the bearing inner ring 231 to rotate, so that the bearing outer ring 232 drives the cylinder body 320 to move back and forth.

[0058] Further, the bearing inner ring 231 further comprises an inner ring body 231a, the inner ring body 231a is spherical and serves to connect the bearing outer ring 232. The bearing outer ring 232 comprises an outer ring body 232a and a swing rod 232b, and the inner ring body 231a and the outer ring body 232a are provided with rolling bodies therebetween, and the rotation of the inner ring body 231a can be converted into the back and forth swing of the swing rod 232b. The swing rod bearing 230 is a mature prior art in the field, and will not be described in more detail here.

[0059] Further, the clutching gear sleeve 220 further comprises a primary transmission gear 222 connected with the gear sleeve part 221, and the rotating sleeve 330 is sleeved with a secondary transmission gear 350, and the secondary transmission gear 350 and the primary transmission gear 222 are in transmission connection.

[0060] With this structure, the clutching gear sleeve 220 can be always in transmission connection with the rotating sleeve 330, and is selectively connected with the swing rod bearing 230 according to the working mode. Through the gear meshing transmission, the connection is stable and reliable, and the stable rotation of the rotating sleeve 330 is effectively ensured. Alternatively, the gear sleeve part 221 and the primary transmission gear 222 are in one-piece structure.

[0061] Further, the primary transmission gear 222 and the gear shaft 210 are in spline coupling.

[0062] Specifically, the primary transmission gear 222 is provided with internal splines, and the position of the clutching gear sleeve 220 on the gear shaft 210 is provided with external splines, and the internal splines and the external splines are in meshing transmission. It can be understood that the position of the bearing inner ring 231 on the gear shaft 210 is the light shaft, and this part is in clearance fit with the bearing inner ring 231, so that the rotation of the gear shaft 210 will not affect the bearing inner ring 231.

[0063] Further, Figure 9 The structure of the push plate 340 according to the embodiment of the utility model is schematically shown. Referring to Figure 6 、 Figure 8 andFigure 9 The impact rotating assembly 300 further comprises a push plate 340 sleeved on the rotating sleeve 330, and the clutch gear sleeve 220 and the rotating sleeve 330 are connected through the push plate 340.

[0064] Optionally, a clamping groove 223 is arranged between the primary transmission gear 222 and the gear sleeve part 221, and the bottom of the push plate 340 is clamped into the clamping groove 223. Optionally, the push plate 340 comprises a sleeve ring 341 and a clamping part 342 connected with each other, the sleeve ring 341 is sleeved on the rotating sleeve 330, and the clamping part 342 is used for clamping with the clamping groove 223. The rotating sleeve 330 drives the clutch gear sleeve 220 to move forward and backward through the push plate 340, and the stable connection between the primary transmission gear 222 and the secondary transmission gear 350 can be ensured at all times. Optionally, the bottom edge of the clamping part 342 is concave circular, and the shape thereof is set according to the shape of the clamping groove 223, so that a larger contact area is ensured between the push plate 340 and the clamping groove 223, and the clamping part 342 and the clutch gear sleeve 220 are prevented from being separated. In some embodiments, the push plate 340 and the clutch gear sleeve 220 can also be fixedly connected through welding or the like.

[0065] The working principle of the mini electric hammer in the technical solution is as follows:

[0066] When the mini electric hammer needs to work in the drilling mode, the rotating adjusting part 420 drives the protruding part 424 on the adjusting part 420 to move away from the mark 120, at this time, the limiting pin 410 is inserted into the inside of the shell 100 under the action of the pressing protrusion 421 and abuts against the limiting ring rib 331 on the rotating sleeve 330. In this case, the rotating sleeve 330 cannot move backward, so that the clutch gear sleeve 220 and the inner ring 231 of the bearing are away from each other. After the motor 240 is started, the motor 240 drives the gear shaft 210 to rotate through the driving gear 250 and the driven gear 260, the gear shaft 210 drives the clutch gear sleeve 220 to rotate, the clutch gear sleeve 220 is driven through the primary transmission gear 222 and the secondary transmission gear 350 on the rotating sleeve 330, so that the rotating sleeve 330 drives the tool head to rotate, and the mini electric hammer only has the function of the drill.

[0067] When the mini electric hammer needs to work in the hammer drill mode, the adjusting part 420 is rotated to make the protruding part 424 on the adjusting part 420 face the mark 120, at this time, the limiting pin 410 enters the avoiding groove 422 under the restoring force of the spring 430, and the bottom is away from the rotating sleeve 330. In this case, the operator holds the mini electric hammer and puts the tool head against the processing surface, the rotating sleeve 330 drives the clutch sleeve 220 to move backward, and then the tooth sleeve part 221 on the clutch sleeve 220 and the transmission part 231b on the bearing inner ring 231 are in transmission connection. After the motor 240 is started, the motor 240 drives the tooth shaft 210 to rotate through the driving gear 250 and the driven gear 260, the tooth shaft 210 drives the clutch sleeve 220 to rotate, the clutch sleeve 220 drives the rotating sleeve 330 through the primary transmission gear 222 and the secondary transmission gear 350, the rotating sleeve 330 drives the tool head to rotate, at the same time, the clutch sleeve 220 drives the bearing inner ring 231 through the tooth sleeve part 221 and the transmission part 231b, and then the swing rod 232b in the bearing outer ring 232 pushes the cylinder body 320 to move back and forth, so that the hammer 310 performs the impact action, thus, the mini electric hammer has the hammer drill function.

[0068] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A mini electric hammer, characterized in that, It includes a housing (100), an adjustment assembly (400), a power transmission assembly (200), and an impact rotation assembly (300), wherein the power transmission assembly (200) and the impact rotation assembly (300) are disposed inside the housing (100); The power transmission assembly (200) includes a gear shaft (210), a clutch sleeve (220), a rocker arm bearing (230), and a motor (240). The rocker arm bearing (230) includes an inner bearing ring (231) and an outer bearing ring (232) that are connected in transmission. The inner bearing ring (231) is rotatably fitted on the gear shaft (210). The clutch sleeve (220) is movably fitted on the gear shaft (210) and is connected in transmission with the gear shaft (210). The clutch sleeve (220) can move along the gear shaft (210) and be connected in transmission with the inner bearing ring (231). The motor (240) is used to drive the gear shaft (210) to rotate. The impact rotation assembly (300) includes a hammer (310), a cylinder body (320), and a rotating sleeve (330). The hammer (310) is slidably disposed inside the cylinder body (320). The cylinder body (320) is reciprocally disposed inside the rotating sleeve (330). The cylinder body (320) is connected to the outer ring (232) of the bearing. The rotating sleeve (330) can reciprocate axially. The axial movement of the rotating sleeve (330) can drive the clutch gear sleeve (220) to move. The rotation of the clutch gear sleeve (220) can drive the rotating sleeve (330) to rotate. The adjustment assembly (400) includes a limiting pin (410), and the housing (100) is provided with a clearance hole (110). The limiting pin (410) passes through the housing (100) radially along the rotating sleeve (330) and is capable of moving radially along the rotating sleeve (330). The limiting pin (410) is close to the rotating sleeve (330) and can abut against the rotating sleeve (330) so that the clutch sleeve (220) is away from the bearing inner ring (231); when the limiting pin (410) is away from the rotating sleeve (330), the rotating sleeve (330) can drive the clutch sleeve (220) to move along the gear shaft (210) so that the clutch sleeve (220) and the bearing inner ring (231) are connected in transmission.

2. The mini electric hammer according to claim 1, characterized in that, The adjusting assembly (400) further includes an adjusting part (420), the projection of the adjusting part (420) on the housing (100) not coinciding with the projection of the gear shaft (210) on the housing (100), and the adjusting part (420) is located at the end of the housing (100) away from the motor (240). The adjusting part (420) is rotatably sleeved on the outside of the housing (100). The inner ring is provided with a relief groove (422) and a pressing protrusion (421). The pressing protrusion (421) and the relief groove (422) are arranged along the circumference of the adjusting part (420). The relief groove (422) is used to accommodate the end of the limiting pin (410) away from the rotating sleeve (330). The pressing protrusion (421) is used to bring the limiting pin (410) close to the rotating sleeve (330) and abut against the rotating sleeve (330).

3. The mini electric hammer according to claim 2, characterized in that, The clearance groove (422) and the pressing protrusion (421) are connected by an inclined surface (423).

4. The mini electric hammer according to any one of claims 1-3, characterized in that, A spring (430) is fitted on the limiting pin (410), and the restoring force of the spring (430) can cause the limiting pin (410) to move away from the rotating sleeve (330).

5. The mini electric hammer according to claim 4, characterized in that, The inner wall of the housing (100) is connected to a guide sleeve (440), the bottom of the limiting pin (410) passes through the guide sleeve (440), the top of the limiting pin (410) is provided with an anti-detachment part (411), the top of the spring (430) abuts against the anti-detachment part (411), and the bottom of the spring (430) abuts against the guide sleeve (440).

6. The mini electric hammer according to any one of claims 1-3, characterized in that, The outer ring of the rotating sleeve (330) is provided with a limiting ring rib (331), which is used to abut against the limiting pin (410).

7. The mini electric hammer according to any one of claims 1-3, characterized in that, The clutch sleeve (220) includes a sleeve portion (221), the inner wall of which is provided with an internal gear. The bearing inner ring (231) includes a transmission portion (231b), which is provided with an external gear. The clutch sleeve (220) is close to the bearing inner ring (231) so that the sleeve portion (221) can be sleeved on the transmission portion (231b) to enable the internal gear and the external gear to mesh and transmit power.

8. The mini electric hammer according to claim 7, characterized in that, The clutch sleeve (220) also includes a primary transmission gear (222) connected to the sleeve portion (221), and a secondary transmission gear (350) is sleeved on the rotating sleeve (330), and the secondary transmission gear (350) and the primary transmission gear (222) are connected in a transmission manner.

9. The mini electric hammer according to claim 8, characterized in that, The primary transmission gear (222) and the gear shaft (210) are splined together.

10. The mini electric hammer according to any one of claims 1-3, characterized in that, The impact rotation assembly (300) also includes a push plate (340) sleeved on the rotating sleeve (330), and the clutch gear sleeve (220) and the rotating sleeve (330) are connected through the push plate (340).

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