Mini electric hammer

Abstract

The invention 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. 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 invention belongs to the technical field of electric tools, and in particular relates to a mini electric hammer. Background Art

[0002] The electric hammer is an electric tool that can drive the drill bit to rotate and reciprocate. Since the drill bit of the electric hammer produces rapid reciprocating motion (frequent impact) along the direction of the electric drill rod while rotating, it can quickly drill holes in brittle materials such as cement concrete and stone. According to specific usage needs, the conversion switch can be used to put the electric hammer in different working modes.

[0003] The electric hammer in the prior art usually sets the mode adjustment component on the side of the overall structure, which leads to a complex internal structure, a large structural volume, and difficulty in miniaturization. Furthermore, the mode switching accuracy is not high, which brings inconvenience to the user.

[0004] Therefore, there is an urgent need to propose a mini electric hammer with a simple structure and precise mode switching to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to at least solve the problem of how to simplify the mini electric hammer to improve the accuracy of mode switching. This purpose is achieved through the following technical solutions:

[0006] The first aspect of the present invention provides a mini electric hammer, comprising:

[0007] It comprises a housing, an adjustment component, a power transmission component and an impact rotation component, wherein the power transmission component and the impact rotation component are arranged inside the housing;

[0008] The power transmission assembly includes a gear shaft, a clutch sleeve, a rocker bearing and a motor, the rocker bearing includes a bearing inner ring and a bearing outer ring which are transmission-connected, the bearing inner ring is rotatably sleeved on the gear shaft, the clutch sleeve is movably sleeved on the gear shaft and the clutch sleeve is transmission-connected to the gear shaft, the clutch sleeve can be transmission-connected to the bearing inner ring when it moves along the gear shaft, and the motor is used to drive the gear shaft to rotate;

[0009] The impact rotation assembly includes a hammer, a cylinder body and a rotating sleeve, wherein the hammer is slidably disposed inside the cylinder body, the cylinder body is reciprocatingly disposed inside the rotating sleeve, the cylinder body is connected to the outer ring of the bearing, the rotating sleeve can reciprocate axially, the axial movement of the rotating sleeve can drive the clutch gear sleeve to move, and the rotation of the clutch gear sleeve can drive the rotating sleeve to rotate;

[0010] The adjustment assembly includes a limit pin, and the housing is provided with an avoidance hole. The limit pin is penetrated through the housing along the radial direction of the rotating sleeve and can move along the radial direction of the rotating sleeve;

[0011] The limit pin is close to the rotating sleeve and can abut against the rotating sleeve to make the clutch sleeve move away from the inner ring of the bearing; when the limit pin is away from the rotating sleeve, the rotating sleeve can drive the clutch sleeve to move along the gear shaft to make the clutch sleeve and the inner ring of the bearing connected in transmission.

[0012] The mini electric hammer in the present technical solution has a drilling mode and a hammer-drilling mode. When the mini electric hammer is required to work in the drilling mode, the operator can insert the limit pin downward along the avoidance hole into the interior of the shell so that the limit pin and the rotating sleeve are against each other. In this case, the operator holds the mini electric hammer and presses the tool head against the processing surface. Due to the obstruction of the limit pin, the rotating sleeve cannot move backward, so that the clutch gear sleeve and the inner ring of the bearing are away from each other. After starting the motor, the motor drives the gear shaft to rotate, and the gear shaft drives the clutch gear sleeve to rotate. The clutch gear sleeve can only drive the rotating sleeve to rotate but cannot drive the inner ring of the bearing to rotate. The mini electric hammer only has the function of drilling. When the mini electric hammer is required to work in the hammer-drilling mode, the operator can move the limit pin away from the rotating sleeve. In this case, the operator holds the mini electric hammer and presses the tool head against the processing surface. The rotating sleeve will drive the clutch gear sleeve to move backward, and then the clutch gear sleeve and the inner ring of the bearing are connected in transmission. After starting the motor, the motor drives the gear shaft to rotate, and the gear shaft drives the clutch gear sleeve to rotate. The clutch gear sleeve not only drives the rotating sleeve to rotate, but also drives the inner ring of the bearing to rotate. Then the outer ring of the bearing pushes the cylinder body to move back and forth, so that the hammer performs an impact action. Therefore, the mini electric hammer has the function of a hammer drill. In summary, the mini electric hammer provided by this technical solution has a simple structure and is very convenient to switch between modes. It only requires moving the limit pin. The limit pin can effectively block the rotation in the drilling mode and does not affect the movement of the rotating sleeve in the hammer drilling mode, thereby realizing the precise switching of different modes and helping to improve work efficiency.

[0013] In addition, the mini electric hammer of the present invention may also have the following additional technical features:

[0014] In some embodiments of the present invention, the adjustment assembly also includes an adjusting part, the projection of the adjusting part on the shell does not overlap with the projection of the gear shaft on the shell, and the adjusting part is located at an end of the shell away from the motor, the adjusting part is rotatably mounted on the outside of the shell, the inner ring of the adjusting part is provided with an avoidance groove and a pressing protrusion, the pressing protrusion and the avoidance groove are arranged along the circumference of the adjusting part, the avoidance groove is used to accommodate the end of the limit pin away from the rotating sleeve, and the pressing protrusion is used to make the limit pin approach the rotating sleeve and abut against the rotating sleeve.

[0015] In some embodiments of the present invention, the avoidance groove and the pressing protrusion are transitionally connected via an inclined surface.

[0016] In some embodiments of the present invention, a spring is sleeved on the limit pin, and the restoring force of the spring can enable the limit pin to move in a direction away from the rotating sleeve.

[0017] In some embodiments of the present invention, a guide sleeve is connected to the inner wall of the shell, the bottom of the limit pin is passed through the guide sleeve, an anti-slip portion is provided at the top of the limit pin, the top of the spring abuts against the anti-slip portion, and the bottom of the spring abuts against the guide sleeve.

[0018] In some embodiments of the present invention, a limiting ring rib is provided on the outer ring of the rotating sleeve, and the limiting ring rib is used to abut against the limiting pin.

[0019] In some embodiments of the present invention, the clutch gear sleeve includes a gear sleeve portion, an inner wall of the gear sleeve portion is provided with an internal gear, the bearing inner ring includes a transmission portion, and the transmission portion is provided with an external gear. The clutch gear sleeve is close to the bearing inner ring so that the gear sleeve portion can be sleeved on the transmission portion to enable the internal gear and the external gear to mesh and transmit.

[0020] In some embodiments of the present invention, the clutch gear sleeve further comprises a primary transmission gear connected to the gear sleeve portion, and a secondary transmission gear is sleeved on the rotating sleeve, and the secondary transmission gear is transmission-connected to the primary transmission gear.

[0021] In some embodiments of the present invention, the primary transmission gear and the gear shaft are spline-connected.

[0022] In some embodiments of the present invention, the impact rotation assembly further includes a push plate sleeved on the rotating sleeve, and the clutch gear sleeve and the rotating sleeve are connected via the push plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 The structure diagram of a mini electric hammer according to an embodiment of the present invention is schematically shown;

[0025] Figure 2 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 1 ;

[0026] Figure 3 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 2 ;

[0027] Figure 4 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 3 ;

[0028] Figure 5 The structure diagram of the adjustment part according to the embodiment of the present invention is schematically shown;

[0029] Figure 6 The schematic diagram shows the local structure of the mini electric hammer according to the embodiment of the present invention. Figure 1 ;

[0030] Figure 7 The schematic diagram shows the local structure of the mini electric hammer according to the embodiment of the present invention. Figure 2 ;

[0031] Figure 8 The structure diagram of the clutch sleeve according to the embodiment of the present invention is schematically shown;

[0032] Fig. 9 The schematic diagram of the structure of the push plate according to the embodiment of the present invention is schematically shown.

[0033] The reference numerals in the accompanying drawings represent the following:

[0034] 100, housing; 110, avoidance hole; 120, identification;

[0035] 200, power transmission assembly; 210, gear shaft; 220, clutch gear sleeve; 221, gear sleeve unit; 222, primary transmission gear; 223, slot; 230, rocker bearing; 231, bearing inner ring; 231a, inner ring body; 231b, transmission unit; 232, bearing outer ring; 232a, outer ring body; 232b, rocker; 240, motor; 250, driving gear; 260, driven gear;

[0036] 300, impact rotating 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 rod;

[0037] 400, adjustment assembly; 410, limit pin; 411, anti-slip portion; 420, adjustment portion; 421, pressing protrusion; 422, avoidance groove; 423, inclined surface; 424, protrusion; 430, spring; 440, guide sleeve. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0040] Although the terms first, second, third, etc. can be used in the text to describe multiple 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 only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0041] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0042] Figure 1 The structure diagram of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 2 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 1 , Figure 3 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 2 .like Figures 1 to 3 As shown, the present invention proposes a mini electric hammer, including a housing 100, an adjustment component 400, a power transmission component 200 and an impact rotation component 300, wherein the power transmission component 200 and the impact rotation component 300 are arranged inside the housing 100; the power transmission component 200 includes a gear shaft 210, a clutch gear sleeve 220, a rocker bearing 230 and a motor 240, the rocker bearing 230 includes a bearing inner ring 231 and a bearing outer ring 232 which are transmission-connected, 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 is transmission-connected to the gear shaft 210, the clutch gear sleeve 220 moves along the gear shaft 210 and can be transmission-connected to the bearing inner ring 231, and 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 arranged inside the cylinder body 320. The cylinder body 320 is reciprocatingly arranged 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 limit pin 410 is close to the rotating sleeve 330 and can abut against the rotating sleeve 330 to keep the clutch gear sleeve 220 away from the inner ring 231 of the bearing. When the limit 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 to make the clutch gear sleeve 220 and the inner ring 231 of the bearing transmission connection.

[0043] The mini electric hammer in the present technical solution has a drilling mode and a hammer-drilling mode. When the mini electric hammer is required to work in the drilling mode, the operator can insert the limit pin 410 downward along the avoidance hole 110 into the interior of the housing 100 so that the limit pin 410 and the rotating sleeve 330 are against each other. In this case, the operator holds the mini electric hammer and places the tool head against the processing surface. Due to the obstruction of the limit pin 410, the rotating sleeve 330 cannot move backward, so that the clutch gear sleeve 220 and the bearing inner ring 231 are away from each other. After starting the motor 240, the motor 240 drives the gear shaft 210 to rotate, and the gear shaft 210 drives the clutch gear sleeve 220 to rotate. The clutch gear sleeve 220 can only drive the rotating sleeve 330 to rotate but cannot drive the bearing inner ring 231 to rotate. The mini electric hammer only has the function of drilling. When the mini electric hammer is required to work in the hammer drill mode, the operator can move the limit pin 410 away from the rotating sleeve 330. In this case, the operator holds the mini electric hammer and places the tool head against the processing surface, and the rotating sleeve 330 will drive the clutch gear sleeve 220 to move backward, and then the clutch gear sleeve 220 and the inner ring 231 of the bearing are connected in transmission. After starting the motor 240, the motor 240 drives the gear shaft 210 to rotate, and the gear shaft 210 drives the clutch gear sleeve 220 to rotate. The clutch gear sleeve 220 not only drives the rotating sleeve 330 to rotate, but also drives the inner ring 231 of the bearing to rotate, and then the outer ring 232 of the bearing pushes the cylinder body 320 to move back and forth, so that the hammer 310 performs an impact action, and thus the mini electric hammer has the function of a hammer drill. In summary, the mini electric hammer provided by the present technical solution has a simple structure and is very convenient to switch modes, and only the limit pin 410 needs to be moved. The limit pin 410 can effectively block the rotational movement in the drilling mode and does not affect the movement of the rotary sleeve 330 in the hammer drilling mode, thereby achieving accurate switching between different modes and helping to improve work efficiency.

[0044] Optionally, a striker rod 360 is provided at the front end of the striker 310, and the front end of the striker rod 360 is used to install a tool head (not shown in the figure). In the hammer drill mode, the reciprocating motion of the cylinder body 320 can drive the striker 310 to hammer the striker rod 360, thereby moving the tool head forward and backward. Optionally, a driving gear 250 is connected to the output end of the motor 240, and a driven gear 260 is sleeved on the gear shaft 210. When the motor 240 is started, the driving gear 250 and the driven gear 260 are meshed for transmission.

[0045] Further, Figure 4 The schematic diagram of the structure of the adjustment part 420 according to the embodiment of the present invention is schematically shown. Figure 5 The cross-sectional view of a mini electric hammer according to an embodiment of the present invention is schematically shown. Figure 3 See also Figures 1 to 5The adjustment component 400 also includes an adjustment part 420, the projection of the adjustment part 420 on the shell 100 does not coincide with the projection of the gear shaft 210 on the shell 100, and the adjustment part 420 is located at the end of the shell 100 away from the motor 240, the adjustment part 420 is rotatably sleeved on the outside of the shell 100, and the inner ring of the adjustment part 420 is provided with an avoidance groove 422 and a pressing protrusion 421, the pressing protrusion 421 and the avoidance groove 422 are arranged along the circumference of the adjustment part 420, the avoidance groove 422 is used to accommodate the end of the limit pin 410 away from the rotating sleeve 330, and the pressing protrusion 421 is used to make the limit pin 410 close to the rotating sleeve 330 and abut against the rotating sleeve 330.

[0046] Optionally, the adjusting portion 420 is an annular structure, which is located at the front end of the rotating sleeve 330. By rotating the adjusting portion 420, the working mode can be switched, and the operation is very convenient. Exemplarily, when the adjusting portion 420 is rotated so that the pressing protrusion 421 contacts the top of the limit pin 410, the limit pin 410 moves toward the rotating sleeve 330 under the pressure of the pressing protrusion 421, and abuts against the rotating sleeve 330 to prevent the rotating sleeve 330 from moving toward the rear end of the mini electric hammer. When the adjusting portion 420 is rotated so that the avoidance groove 422 and the limit pin 410 are facing each other, the top of the limit pin 410 extends into the avoidance groove 422, thereby avoiding contact between the limit pin 410 and the rotating sleeve 330, and the rotating sleeve 330 can move axially.

[0047] Optionally, the number of the limit pins 410 can be one or more. In the present embodiment, the number of the limit pins 410 is three, and the three limit pins 410 are evenly spaced and distributed along the outer periphery of the rotating sleeve 330. In other embodiments, the number of the limit pins 410 may also be one, two, four or five, etc. By providing a plurality of limit pins 410, the force when the limit pins 410 and the rotating sleeve 330 abut can be effectively dispersed. Accordingly, the number and position of the avoidance grooves 422 are provided according to the number and position of the limit pins 410 to ensure that the avoidance grooves 422 and the limit pins 410 correspond one to one. The adjusting portion 420 forms a protrusion 424 on the outside of the position of the avoidance groove 422, and the provision of the protrusion 424 can prompt the user to the position of the avoidance groove 422, so that the user knows whether the adjusting portion 420 is rotated into place. It can be understood that a pressing protrusion 421 is formed between adjacent avoidance grooves 422, and the height between the end surface of the pressing protrusion 421 and the bottom of the avoidance groove 422 is set according to the distance that the limit pin 410 needs to move. Optionally, at least one mark 120 is set on the side of the housing 100, and the positions of the mark 120 and the limit pin 410 correspond, so that when the protrusion 424 faces the mark 120, the avoidance groove 422 faces the limit pin 410, that is, the mini electric hammer is in the hammer drill mode.

[0048] Further, see Figure 4The avoidance groove 422 and the pressing protrusion 421 are transitionally connected via the inclined surface 423 .

[0049] That is, an obtuse angle is formed between the side wall and the bottom of the avoidance groove 422 , thereby facilitating the rotation of the adjustment portion 420 and preventing the adjustment portion 420 and the limiting pin 410 from being stuck.

[0050] Further, see Figure 5 A spring 430 is sleeved on the limiting pin 410 , and the restoring force of the spring 430 can enable the limiting pin 410 to move in a direction away from the rotating sleeve 330 .

[0051] By setting a spring 430 on the limit pin 410, when the top of the limit pin 410 enters the avoidance groove, the spring 430 can push the limit pin 410 to move upward, thereby separating the limit pin 410 and the rotating sleeve 330, and keeping the limit pin 410 away from the rotating sleeve 330.

[0052] Furthermore, a guide sleeve 440 is connected to the inner wall of the shell 100, the bottom of the limit pin 410 is inserted into the guide sleeve 440, the top of the limit pin 410 is provided with an anti-slip portion 411, the top of the spring 430 abuts against the anti-slip portion 411, and the bottom of the spring 430 abuts against the guide sleeve 440.

[0053] It can be understood that the guide sleeve 440 guides the movement of the limit pin 410 and can limit the spring 430. Optionally, the guide sleeve 440 is embedded in the inner wall of the housing 100 to save the internal space of the housing 100. Optionally, the top of the anti-slip portion 411 is a dome, which can facilitate the rotation of the adjustment portion 420 and prevent the adjustment portion 420 and the limit pin 410 from getting stuck.

[0054] Further, Figure 6 The schematic diagram shows the local structure of the mini electric hammer according to the embodiment of the present invention. Figure 1 See also Figure 6 The outer ring of the rotating sleeve 330 is provided with a limiting ring rib 331, and the limiting ring rib 331 is used to abut 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 processing surface, the limiting pin 410 can prevent the limiting ring from moving backwards.

[0056] Further, Figure 7 The following schematically shows a partial structural diagram of a mini electric hammer according to an embodiment of the present invention. Figure 8 The structure diagram of the clutch sleeve 220 according to the embodiment of the present invention is schematically shown. Figures 6 to 8The clutch gear sleeve 220 includes a gear sleeve portion 221, an inner wall of which is provided with an internal gear, and the bearing inner ring 231 includes a transmission portion 231b, which is provided with an external gear. The clutch gear sleeve 220 is close to the bearing inner ring 231 so that the gear sleeve portion 221 can be sleeved on the transmission portion 231b to enable the internal gear and the external gear to mesh and transmit.

[0057] As described above, the gear shaft 210 and the clutch sleeve 220 are in transmission connection. Therefore, when the transmission portion 231b of the clutch sleeve 220 is sleeved on the transmission portion 231b of the bearing inner ring 231, the gear shaft 210 rotates to drive the clutch sleeve 220 to rotate, and the clutch 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 forward and backward.

[0058] Furthermore, the inner ring 231 of the bearing further includes an inner ring body 231a, which is spherical and serves to connect the outer ring 232 of the bearing. The outer ring 232 of the bearing includes an outer ring body 232a and a swing rod 232b, and a rolling body is arranged between the inner ring body 231a and the outer ring body 232a, and the rotation of the inner ring body 231a can be converted into the forward and backward swing of the swing rod 232b. The swing rod bearing 230 is a mature prior art in the art and will not be described in detail here.

[0059] Furthermore, the clutch gear sleeve 220 also includes a primary transmission gear 222 connected to the gear sleeve portion 221 , and a secondary transmission gear 350 is sleeved on the rotating sleeve 330 , and the secondary transmission gear 350 is transmission-connected to the primary transmission gear 222 .

[0060] This structural form can ensure that the clutch sleeve 220 is always in transmission connection with the rotating sleeve 330, and is selectively connected with the rocker bearing 230 according to the working mode. Through the gear meshing transmission, the connection is stable and reliable, and the rotating sleeve 330 is effectively guaranteed to rotate smoothly. Optionally, the sleeve portion 221 and the primary transmission gear 222 are an integrated structure.

[0061] Furthermore, the primary transmission gear 222 and the gear shaft 210 are spline-connected.

[0062] Specifically, the primary transmission gear 222 is provided with an internal spline, and the position of the clutch gear sleeve 220 on the gear shaft 210 is provided with an external spline, and the internal spline and the external spline are meshed for transmission. It can be understood that the position of the bearing inner ring 231 on the gear shaft 210 is an optical axis, and this part and the bearing inner ring 231 are clearance-matched, so that the rotation of the gear shaft 210 will not affect the bearing inner ring 231.

[0063] Further, Fig. 9 The schematic diagram of the structure of the push plate 340 according to the embodiment of the present invention is shown schematically. Figure 6 , Figure 8 and Fig. 9 The impact rotating assembly 300 further includes a push plate 340 sleeved on the rotating sleeve 330 , and the clutch gear sleeve 220 and the rotating sleeve 330 are connected via the push plate 340 .

[0064] Optionally, a slot 223 is provided between the primary transmission gear 222 and the gear sleeve 221, and the bottom of the push plate 340 is inserted into the slot 223. Optionally, the push plate 340 includes a collar 341 and a clamping portion 342 connected to each other, the collar 341 is sleeved on the rotating sleeve 330, and the clamping portion 342 is used to clamp with the slot 223. The rotating sleeve 330 pushes the clutch gear sleeve 220 to move forward and backward through the push plate 340, which can always ensure that the primary transmission gear 222 and the secondary transmission gear 350 are stably connected. Optionally, the bottom edge of the clamping portion 342 is a concave circle, and its shape is set according to the shape of the slot 223, so as to ensure that there is a large contact area between the push plate 340 and the slot 223, and prevent the clamping portion 342 and the clutch gear sleeve 220 from being separated. In some embodiments, the push plate 340 and the clutch gear sleeve 220 can also be fixedly connected by welding or the like.

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

[0066] When the mini electric hammer is required to work in the drilling mode, the adjusting part 420 is rotated to make the protrusion 424 on the adjusting part 420 away from the mark 120. At this time, the limit pin 410 is inserted downward into the interior of the housing 100 under the action of the pressing protrusion 421 and abuts against the limit 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 bearing inner ring 231 are away from each other. After starting the motor 240, the motor 240 drives the gear shaft 210 to rotate through the driving gear 250 and the driven gear 260, and 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 drilling.

[0067] When the mini electric hammer is required to work in the hammer drill mode, the adjusting part 420 is rotated so that the protrusion 424 on the adjusting part 420 is facing the mark 120. At this time, the top of the limit pin 410 enters the avoidance groove 422 under the action of 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, and the rotating sleeve 330 drives the clutch gear sleeve 220 to move backward, and then the gear sleeve part 221 on the clutch gear sleeve 220 and the transmission part 231b on the bearing inner ring 231 are in transmission connection. After starting the motor 240, the motor 240 drives the gear shaft 210 to rotate through the driving gear 250 and the driven gear 260, and the gear shaft 210 drives the clutch gear sleeve 220 to rotate. The clutch gear sleeve 220 is driven by the primary transmission gear 222 and the secondary transmission gear 350 on the rotating sleeve 330, and the rotating sleeve 330 drives the tool head to rotate. At the same time, the clutch gear sleeve 220 is driven by the gear sleeve part 221 and the transmission part 231b on the bearing inner ring 231, and then the rocker rod 232b in the bearing outer ring 232 pushes the cylinder body 320 to reciprocate, so that the hammer 310 performs an impact action. Therefore, the mini electric hammer has the function of a hammer drill.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A mini electric hammer, characterized in that: It comprises 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 arranged inside the housing (100); The power transmission assembly (200) comprises a gear shaft (210), a clutch gear sleeve (220), a rocker bearing (230) and a motor (240); the rocker bearing (230) comprises a bearing inner ring (231) and a bearing outer ring (232) which are transmission-connected; 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 transmission-connected; the clutch gear sleeve (220) can be transmission-connected to the bearing inner ring (231) when it moves along the gear shaft (210); and the motor (240) is used for driving the gear shaft (210) to rotate; The impact rotation assembly (300) comprises 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 reciprocatingly disposed inside the rotating sleeve (330); the cylinder body (320) is connected to the bearing outer ring (232); the rotating sleeve (330) is reciprocatingly movable in the axial direction; the axial movement of the rotating sleeve (330) can drive the clutch gear sleeve (220) to move; and the rotation of the clutch gear sleeve (220) can drive the rotating sleeve (330) to rotate; The adjustment component (400) comprises a limit pin (410), the housing (100) is provided with an avoidance hole (110), and the limit pin (410) is penetrated through the housing (100) along the radial direction of the rotating sleeve (330) and can move along the radial direction of the rotating sleeve (330); The limit pin (410) is close to the rotating sleeve (330) and can abut against the rotating sleeve (330) to move the clutch sleeve (220) away from the bearing inner ring (231); when the limit 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) to achieve transmission connection between the clutch sleeve (220) and the bearing inner ring (231).

2. The mini electric hammer according to claim 1, characterized in that: The adjustment assembly (400) further comprises an adjustment portion (420), the projection of the adjustment portion (420) on the housing (100) not overlapping with the projection of the gear shaft (210) on the housing (100), and the adjustment portion (420) is located at an end of the housing (100) away from the motor (240), and the adjustment portion (420) is rotatably sleeved on the outside of the housing (100), and the adjustment portion (420) is The inner ring is provided with an avoidance groove (422) and a pressing protrusion (421), and the pressing protrusion (421) and the avoidance groove (422) are arranged along the circumference of the adjusting portion (420), the avoidance groove (422) is used to accommodate one end of the limit pin (410) away from the rotating sleeve (330), and the pressing protrusion (421) is used to make the limit 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 avoidance groove (422) and the pressing protrusion (421) are transitionally connected via an inclined surface (423).

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

5. The mini electric hammer according to claim 4, characterized in that: The inner wall of the shell (100) is connected to a guide sleeve (440), the bottom of the limit pin (410) is inserted into the guide sleeve (440), the top of the limit pin (410) is provided with an anti-slip portion (411), the top of the spring (430) abuts against the anti-slip portion (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 to 3, characterized in that: The outer ring of the rotating sleeve (330) is provided with a limiting ring rib (331), and the limiting ring rib (331) is used to abut against the limiting pin (410).

7. The mini electric hammer according to any one of claims 1 to 3, characterized in that: The clutch gear sleeve (220) comprises a gear sleeve portion (221), the inner wall of which is provided with an internal gear; the bearing inner ring (231) comprises a transmission portion (231b), the transmission portion (231b) is provided with an external gear; the clutch gear sleeve (220) is close to the bearing inner ring (231) so that the gear sleeve portion (221) is sleeved on the transmission portion (231b), so that the internal gear and the external gear are meshed and transmitted.

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

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

10. The mini electric hammer according to any one of claims 1 to 3, characterized in that: The impact rotation 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 via the push plate (340).

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