Power tool

Abstract

The present invention discloses a power tool system, which includes a main body and a working accessory. The working accessory includes a first type of working accessory and a second type of working accessory. The main body includes: a motor; a housing; an output shaft; a transmission device, which is connected to the output shaft, rotates synchronously with the output shaft, and cooperates with the working accessory; a clamping device, which is used to clamp the working accessory in the direction of the central axis. The clamping device cooperates with the transmission device to jointly fix the working accessory. It is characterized in that: the transmission device includes: a first transmission part, which includes a first meshing part that cooperates with the interface part of the first type of working accessory; a second transmission part, which includes a second meshing part that cooperates with the interface part of the second type of working accessory; at least one of the first transmission part and the second transmission part is configured to be movable so that the transmission device can at least switch between a first state and a second state. When the transmission device is in the first state, it cooperates with the first type of working accessory, and when the transmission device is in the second state, it cooperates with the second type of working accessory.

Description

Technical Field

[0001] The present invention relates to a power tool, in particular to a swinging type power tool. Background Art

[0002] Power tools such as swinging type usually need to install a working accessory for operations such as sawing. Currently, there are various working accessories on the market with different interfaces, and power tools cannot be universally compatible with working accessories of different interfaces. Although there are also adapters and connectors attempting to convert and connect working accessories with multiple interfaces, additional adapters and connectors often need to be purchased separately, increasing the user cost. There are also disadvantages such as uneven quality, low installation accuracy, and easy to lose. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the purpose of the present invention is to provide a power tool that can automatically adapt to working accessories with different interfaces.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A power tool system includes a main body and a working accessory. The working accessory includes: a first type of working accessory and a second type of working accessory, and the interface part of the first type of working accessory is different from that of the second type of working accessory;

[0006] The main body includes: a motor; a housing for accommodating the motor; an output shaft driven by the motor to rotate or swing about a central axis; a transmission device configured to be connected to the output shaft, rotate synchronously with the output shaft, and cooperate with the working accessory to transfer torque from the output shaft to the working accessory; a clamping device for clamping the working accessory in the direction of the central axis, and the clamping device cooperates with the transmission device to jointly fix the working accessory. It is characterized in that: the transmission device includes: a first transmission part including a first engaging part that cooperates with the interface part of the first type of working accessory, and the first engaging part transfers torque to the first type of working accessory; a second transmission part including a second engaging part that cooperates with the interface part of the second type of working accessory, and the second engaging part transfers torque to the second type of working accessory; at least one of the first transmission part and the second transmission part is configured to be movable so that the transmission device can at least switch between a first state and a second state. When the transmission device is in the first state, it cooperates with the first type of working accessory, and when the transmission device is in the second state, it cooperates with the second type of working accessory.

[0007] Optionally, the transmission device further includes an annular flange, and the first transmission part and the second transmission part are respectively formed on the front and back surfaces of the annular flange.

[0008] Optionally, the transmission device further includes a chute and a rotating connector. The chute is fixed relative to the output shaft. The rotating connector is connected to the annular flange and is rotatably connected to the chute. When the front side of the annular flange faces the working attachment and is nested on the output shaft, the transmission device is in the first state; when the back side of the annular flange faces the working attachment and is nested on the output shaft, the transmission device is in the second state.

[0009] Optionally, the second transmission part is a plurality of non - continuous teeth protruding from the back side of the annular flange and distributed around it.

[0010] Optionally, when the transmission device is in the first state, the first transmission part protrudes in the direction of the central axis from the second transmission part; when the transmission device is in the second state, the second transmission part protrudes in the direction of the central axis from the first transmission part.

[0011] Optionally, the first transmission part is fixedly connected to the end of the output shaft or integrally formed with the end of the output shaft. The second transmission part is nested on the end of the output shaft and can slide around the output shaft. The second transmission part has a first sliding position and a second sliding position. When the second transmission part is in the first sliding position, the transmission device is in the first state; when the second transmission part is in the second sliding position, the transmission device is in the second state.

[0012] Optionally, the clamping device includes a first clamping position and a second clamping position; when the second transmission part is in the first sliding position, the first type of working attachment can be clamped in the first clamping position; when the second transmission part is in the second sliding position, the second type of working attachment can be clamped in the second clamping position.

[0013] Optionally, the transmission device further includes a fixing part, which is fixedly connected to the end of the output shaft or integrally formed with the end of the output shaft. The first transmission part and the second transmission part are nested on the fixing part.

[0014] Optionally, at least a guide rail is formed on the outside of the fixing part for guiding the relative rotation of the first transmission part and the second transmission part.

[0015] A power tool, comprising: an electric motor; a housing for accommodating the electric motor; an output shaft driven by the electric motor to rotate or swing about a central axis; a transmission device configured to be connected to the output shaft, rotate synchronously with the output shaft, and cooperate with a working accessory to transmit torque from the output shaft to the working accessory; a clamping device for clamping the working accessory in the direction of the central axis, the clamping device cooperating with the transmission device to jointly fix the working accessory; characterized in that: the transmission device includes: a first transmission part including a first engagement part that can cooperate with a first type of working accessory, the first engagement part transmitting torque to the first type of working accessory; a second transmission part including a second engagement part that can cooperate with a second type of working accessory, the second engagement part transmitting torque to the second type of working accessory; at least one of the first transmission part and the second transmission part is configured to be movable so that the transmission device can switch at least between a first state and a second state, when the transmission device is in the first state, it cooperates with the first type of working accessory, and when the transmission device is in the second state, it cooperates with the second type of working accessory.

[0016] The beneficial effect of the present invention is that: this power tool enables users to adapt working accessories with different interfaces without purchasing adapter parts. Brief Description of the Drawings

[0017] Figure 1 is a side view of a power tool as an embodiment;

[0018] Figures 2a - 2c are three common working accessories with different interface parts;

[0019] Figure 3a is a perspective view of an output structure as an embodiment when the transmission device is in the first state;

[0020] Figure 3b is Figure 3a a perspective view of the output structure of

[0021] Figure 4 when the transmission device is in the second state;

[0022] Figure 5 is a step-by-step diagram of the transmission device of the output structure in FIG. 3 switching from the first state to the second state;

[0023] Figure 6a is a perspective view of an output structure as another embodiment when the transmission device is in the first state;

[0024] Figure 6b is Figure 6a a perspective view of the output structure of

[0025] Figure 7is an exploded view of the transmission of the output structure in FIG. 6;

[0026] Figure 8a is a perspective view of the clamping device of the output structure in FIG. 6 in the locked state;

[0027] Figure 8b is a perspective view of the clamping device of the output structure in FIG. 6 in the unlocked state;

[0028] Figure 8c is a perspective view of the clamping device of the output structure in FIG. 3 in the unlocked state;

[0029] Figure 9a is Figure 6a a cross-sectional view of the output structure of;

[0030] Figure 9b is Figure 6b a cross-sectional view of the output structure of;

[0031] Figure 10a is a perspective view of the output structure as another embodiment when the transmission is in the first state;

[0032] Figure 10b is Figure 10a a perspective view of the output structure when the transmission is in the second state;

[0033] Figure 11a is a perspective view of the transmission of the output structure in FIG. 10 when in the first state;

[0034] Figure 11b is a perspective view of the transmission of the output structure in FIG. 10 when in the second state;

[0035] Figure 12a is a perspective view of the transmission of the output structure in FIG. 10 from another angle when in the first state;

[0036] Figure 12b is a perspective view of the transmission of the output structure in FIG. 10 from another angle when in the second state;

[0037] Figure 13 is an exploded view of the transmission of the output structure in FIG. 10. Detailed implementation manners

[0038] Figure 1 The power tool 100 system 10 shown includes a main body 100 and a working accessory 200. The main body 100, that is, the power tool 100, can drive the working accessory 200 to swing, and specifically can be a swinging type power tool 100. Such as Figure 1As shown in FIGS. 1 and 3, the power tool 100 may include: a housing 11, a motor 12, and an output structure 20. As shown in FIG. 3, the output structure 20 includes an output shaft 21, a transmission device 22, and a clamping device 23.

[0039] An accommodation cavity is formed inside the housing 11, and the motor 12 is located in the accommodation cavity. The housing 11 can also serve as a handle for the user to hold. The motor 12 is used to drive the output shaft 21 to rotate or swing about the central axis 101. A second transmission device 22 (not shown) may also be provided between the motor 12 and the output shaft 21 for converting the rotation output by the motor 12 into the swing of the output shaft 21. For example, the second transmission device 22 includes a swing rod that can be driven by the motor 12 to swing, and then the swing rod drives the output shaft 21 to swing about the central axis 101. It should be noted that the transmission device 22 referred to in this application is for transmitting torque between the output shaft 21 and the working accessory 200, rather than the second transmission device 22 for transmitting torque between the motor and the output shaft 21. The transmission device 22 is connected to the output shaft 21, rotates synchronously with the output shaft 21, and cooperates with the working accessory 200 to transmit the torque from the output shaft 21 to the working accessory 200; at the same time, the clamping device 23 clamps the working accessory 200 in the direction of the central axis 101, and the transmission device 22 and the clamping device 23 cooperate to jointly fix the working accessory 200.

[0040] In this way, the output structure 20, that is, the output shaft 21, the transmission device 22, the clamping device 23, and the working accessory 200 can form an integral body that can swing about the central axis 101 with the output shaft 21, and then the swinging working accessory 200 can perform operations such as sawing on the workpiece. For the swinging type power tool 100, the working accessory 200 can be a circular saw blade, a straight saw blade, etc. The working accessory 200 can also be classified according to the material of the working object, such as a saw blade for cutting wood, a saw blade for cutting metal, a saw blade for cutting plastic, etc. The working accessory 200 is usually welded by a working part and an interface part. Figures 2a - 2c FIG. 4 shows the commonly seen working accessory 200 on the current market. Since the working part of the working accessory 200 is not within the scope of discussion in this application, it has been omitted. Figures 2a - 2c FIG. 5 shows three interface types of the working accessory 200. The working accessory 200 cooperates with the transmission device 22 and the clamping device 23 of the power tool 100 through the interface part to achieve swinging. For the convenience of description, it is called Figure 2a the first type of working accessory 201, Figure 2b the second type of working accessory 202, Figure 3aIt is the third type of working accessory 203. The interface 211 of the first type of working accessory 201 is a plurality of radially divergent small holes, and torque is transmitted through the inner wall of the small holes; the interface 212 of the second type of working accessory 202 is a sunken multi-sided star-shaped depression, and torque is transmitted through the side wall of the multi-sided star-shaped depression; the interface of the third type of working accessory 203 is the combination of the interface 211 of the first type of working accessory 201 and the interface 212 of the second type of working accessory 202, and torque can be transmitted either through the inner wall of the small holes or through the side wall of the multi-sided star-shaped depression. Since the third type of working accessory 203 has both types of interfaces at the same time, it has good adaptability itself. However, the first type of working accessory 201 cannot be used on the power tool 100 adapted to the second type of working accessory 202, and the second type of working accessory 202 cannot be used on the power tool 100 adapted to the first type of working accessory 201. At present, in the market and in users' homes, the first type of working accessory 201 and the second type of working accessory 202 exist in large quantities and will still exist for a long time. The inability to flexibly match and use the first type of working accessory 201 and the second type of working accessory 202 causes great waste.

[0041] Referring to FIG. 3- Figure 4 , in one embodiment, the transmission device 22 is at least partially nested on the output shaft 21. Specifically, the transmission device 22 includes an annular flange 220 nested on the output shaft 21, and a first transmission portion 221 and a second transmission portion 222 are respectively formed on the front and back surfaces of the annular flange 220. The first transmission portion 221 includes a first engagement portion 241 that cooperates with the interface portion of the first type of working accessory 201, and the first engagement portion 241 transmits torque to the first type of working accessory 201. The second transmission portion 222 includes a second engagement portion 242 that cooperates with the interface portion of the second type of working accessory 202, and the second engagement portion 242 transmits torque to the second type of working accessory 202. As Figure 3a shown, when the transmission device 22 is in the first state, the first transmission portion 221 cooperates with the first type of working accessory 201. As Figure 3bAs shown, when the transmission device 22 is in the second state, the second transmission part 222 cooperates with the second type of working accessory 202. Optionally, the first transmission part 221 is a plurality of non - continuous tooth parts protruding from the front surface of the annular flange 220; the second transmission part 222 is a plurality of non - continuous tooth parts distributed in a surrounding manner and protruding from the reverse surface of the annular flange 220. The first engaging part 241 can be understood as the side surface of the tooth part of the first transmission part 221; the second engaging part 242 can be understood as the side surface of the tooth part of the second transmission part 222. Relatively speaking, the thickness of the tooth part of the first transmission part 221 is relatively uniform and is used to insert into the small holes in the interface part of the first type of working accessory 201, while the bottom of the tooth part of the second transmission part 222 is thicker and the top is thinner, and is used to cooperate with the inclined side wall of the interface part of the second type of working accessory 202. It can be understood that the cooperation between the first transmission part 221 and the interface part of the first type of working accessory 201, and the cooperation between the second transmission part 222 and the interface part of the second type of working accessory 202 are both to radially fix the working accessory 200 from the annular flange 220, prevent the radial movement of the working accessory 200 and transmit torque, but do not hinder the axial movement of the working accessory 200. In order to prevent the working accessory 200 from moving along the direction of the central axis 101, a clamping device 23 is also required. Specifically, the clamping device 23 can be a Figure 8c beak clip 23 as shown. When installing the working accessory 200, the beak clip 23 is in the unlocked state. At this time, the beak part 233 is closed, and the beak part 233 passes through the central through - hole of the working accessory 200; when the working accessory 200 is installed in place, the beak clip 23 is in the locked state. At this time, the beak part 233 is opened, and the central through - hole of the working accessory 200 is stuck in the clamping position 234 of the beak part 233, so that it cannot move axially.

[0042] At least one of the first transmission part 221 and the second transmission part 222 is configured to be movable so that the transmission device 22 can be switched at least between a first state and a second state. For example, the transmission device 22 further includes a chute 225 which is fixed relative to the output shaft 21. For example, the chute 225 is suspended and connected to the output shaft 21 through a fixing ring, or the chute 225 can also be welded to the output shaft 21. At the same time, the transmission device 22 further includes a rotating connector 224 connected to the annular flange 220. The rotating connector 224 is rotatably connected to the chute 225. When the user nests the annular flange 220 on the output shaft 21, it can be selected to make the front side of the annular flange 220 face the working attachment 200 or the back side face the working attachment 200. When the annular flange 220 is nested on the output shaft 21 with its front side facing the working attachment 200, the transmission device 22 is in the first state; when the annular flange 220 is nested on the output shaft 21 with its back side facing the working attachment 200, the transmission device 22 is in the second state. Specifically, the rotating connector 224 is located on one side of the chute 225, and the main body of the annular flange 220 is located on the other side of the chute 225. The connecting rod 223 between the rotating connector 224 and the main body of the annular flange 220 can slide and rotate in the chute 225 to drive the annular flange 220 to move, so that the transmission device 22 can be switched at least between the first state and the second state. The specific switching steps are as Figure 5 shown: In S1, the transmission device 22 is in the first state. At this time, the first transmission part 221 is closer to the working attachment 200 than the second transmission part 222 and can cooperate with the first type of working attachment 201; in S2, the annular flange 220 is disengaged from the output shaft 21 so that the annular flange 220 is no longer nested on the output shaft 21; in S3, the annular flange 220 is rotated 180 degrees around the axis where the connecting rod 223 is located so that the front side and the back side of the annular flange 220 are reversed; in S4, the annular flange 220 is nested on the output shaft 21 again. At this time, the second transmission part 222 is closer to the working attachment 200 than the first transmission part 221 and can cooperate with the second type of working attachment 202. The material of the chute 225 can be spring steel to clamp the rotating connector 224 so that there is a damping feeling when the transmission device 22 switches states. This kind of structure has a lower cost, the transmission device 22 is convenient to switch between the first state and the second state, the power tool 100 can be adapted to working attachments 200 with different interface types, and the annular flange 220 is not easy to be lost.

[0043] In addition to flipping at least part of the transmission device 22 to switch the positions of the first transmission part 221 and the second transmission part 222, at least part of the transmission device 22 can also be telescoped to switch the positions of the first transmission part 221 and the second transmission part 222. Specifically, when the transmission device 22 is in the first state, the first transmission part 221 protrudes from the second transmission part 222 in the direction of the central axis. When the transmission device 22 is in the second state, the second transmission part 222 protrudes from the first transmission part 221 in the direction of the central axis. In another embodiment, as Figure 7 shown, the first transmission part 221 is fixedly connected to the end of the output shaft 21 or integrally formed with the end of the output shaft 21. The second transmission part 222 is sleeved on the end of the output shaft 21 and can slide around the output shaft 21. The second transmission part 222 has a first sliding position and a second sliding position. Similar to the previous embodiment, the first transmission part 221 is a plurality of discontinuous tooth parts protruding from the end of the output shaft 21, and the first engaging part 241 is the side surface of the tooth part of the first transmission part 221. The second transmission part 222 can be either a flange with a plurality of discontinuous tooth parts or a flange with a side wall having the same multi-sided star-shaped recess as the side wall of the multi-sided star-shaped recess of the second type of working attachment 202. At this time, the second engaging part 242 is the side wall of the multi-sided star-shaped recess. As Figure 6a shown, when the second transmission part 222 is in the first sliding position, the transmission device 22 is in the first state, and the first transmission part 221 protrudes from the second transmission part 222 in the direction of the central axis, and can cooperate with the first type of working attachment 201; as Figure 6b shown, when the second transmission part 222 is in the second sliding position, the transmission device 22 is in the second state, and the second transmission part 222 protrudes from the first transmission part 221 in the direction of the central axis, and can cooperate with the second type of working attachment 202.

[0044] Since in this embodiment, the first transmission part 221 is fixed and only the second transmission part 222 can slide around the output shaft 21, therefore, no matter how the second transmission part 222 slides, for example, slides back and forth along the central axis direction or slides in a spiral manner, when the first transmission part 221 is exposed to cooperate with the first type of working attachment 201 and the second transmission part 222 is exposed to cooperate with the second type of working attachment 202, the heights of their respective engaging planes in the direction of the central axis are different. That is to say, the clamping heights required by the first type of working attachment 201 and the second type of working attachment 202 in the direction of the central axis are different. To solve this problem, the clamping device 23 is provided to include a first clamping position 231 and a second clamping position 232. Refer to Figure 8a and Figure 8b , compared with the previous embodiment, that is, Figure 8c the beak clip 23 shown, the beak clip 23 in this embodiment has one more clamping position. Refer to Figure 9aCross-sectional view. When the second transmission part 222 is in the first sliding position, the first type of working accessory 201 is clamped at the first clamping position 231. At this time, the second clamping position 232 is idle and protrudes from the first type of working accessory 201; see Figure 9b Cross-sectional view. When the second transmission part 222 is in the second sliding position, the second type of working accessory 202 is clamped at the second clamping position 232. At this time, the first clamping position 231 is idle and hidden between the second type of working accessory 202 and the output shaft 21. This kind of structural principle is simple, and the switching between the first state and the second state of the transmission device 22 is convenient. The power tool 100 can be adapted to working accessories 200 of different interface types.

[0045] In another embodiment, still adopt as Figure 8c The clamping device 23 shown with only one clamping position, that is, the clamping height required by the first type of working accessory 201 and the second type of working accessory 202 in the central axis direction remains unchanged. Correspondingly, both the first transmission part 221 and the second transmission part 222 need to move when switching positions, so that the transmission device 22 switches between the first state and the second state. Specifically, as Figure 13 shown, the transmission device 22 further includes a fixing part 226. The fixing part 226 is fixedly connected to the end of the output shaft 21 or integrally formed with the end of the output shaft 21. The first transmission part 221 and the second transmission part 222 are nested on the fixing part 226. Guide rails 227 are formed on the outer walls of the fixing part 226 and the first transmission part 221, and a limiting groove 228 is formed on the inner wall of the second transmission part 222. The guide rails 227 and the limiting groove 228 cooperate to guide the first transmission part 221 and the second transmission part 222 to generate relative rotation. When the user rotates the second transmission part 222, the first transmission part 221 is also guided by the guide rails 227 and the limiting groove 228 to generate a spiral rotation. During the spiral rotation process, the relative positions of the first transmission part 221 and the second transmission part 222 in the central axial direction change, that is, the relative heights of the first type of working accessory 201 and the second type of working accessory 202 in the central axis direction change. When the user rotates the second transmission part 222 clockwise, the first transmission part 221 extends towards the working accessory 200, and the second transmission part 222 retracts in the direction away from the working accessory 200, as Figure 11a and Figure 12a , after reaching the rotation limit, the first transmission part 221 protrudes from the second transmission part 222 in the direction of the central axis, and the transmission device 22 is in the first state and can cooperate with the first type of working accessory 201, such as Figure 10a ; when the user rotates the second transmission part 222 counterclockwise, the second transmission part 222 extends towards the working accessory 200, and the first transmission part 221 retracts in the direction away from the working accessory 200, as Figure 11b and Figure 12b, after reaching the rotation limit, the second transmission part 222 protrudes from the first transmission part 221 in the direction of the central axis, and the transmission device 22 is in the second state, and can cooperate with the second type of working attachment 202, such as Figure 10b . According to the specific settings of the guide rail 227 and the limit groove 228, the extension and retraction of the first transmission part 221 and the second transmission part 222 can have different settings, which are not limited here. This structure is relatively complex and the cost is slightly higher, but there is no need to modify the clamping device 23. The transmission device 22 can be conveniently switched between the first state and the second state, and the power tool 100 can be adapted to working attachments 200 of different interface types.

[0046] It should be noted that the power tool 100 disclosed in the present invention can also be matched with the third type of working attachment 203. Moreover, since the interface of the third type of working attachment 203 is the combination of the interface 211 of the first type of working attachment 201 and the interface 212 of the second type of working attachment 202, the transmission device 22 can be matched with the third type of working attachment 203 in both the first state and the second state, and is not described in detail for the sake of simplicity of description. The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by using equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power tool system, comprising a main body and a working accessory, wherein the working accessory comprises: a first type of working accessory and a second type of working accessory, the interface part of the first type of working accessory being different from the interface part of the second type of working accessory; the main body comprises: a motor; a housing for accommodating the motor; an output shaft driven by the motor to rotate or swing about a central axis; a transmission device configured to be connected to the output shaft, rotate synchronously with the output shaft, and cooperate with the working accessory to transmit torque from the output shaft to the working accessory; a clamping device for clamping the working accessory in the direction of the central axis, the clamping device cooperating with the transmission device to jointly fix the working accessory; characterized in that: the transmission device comprises: a first transmission part, including a first engaging part that cooperates with the interface part of the first type of working accessory, the first engaging part transmitting torque to the first type of working accessory; a second transmission part, including a second engaging part that cooperates with the interface part of the second type of working accessory, the second engaging part transmitting torque to the second type of working accessory; at least one of the first transmission part and the second transmission part is configured to be movable so that the transmission device can switch at least between a first state and a second state. When the transmission device is in the first state, it cooperates with the first type of working accessory, and when the transmission device is in the second state, it cooperates with the second type of working accessory; the first transmission part and the second transmission part can relatively extend and contract to switch the positions of the first transmission part and the second transmission part.

2. The power tool system according to claim 1, characterized in that: the transmission device further comprises an annular flange, and the first transmission part and the second transmission part are respectively formed on the front and back sides of the annular flange.

3. The power tool system according to claim 2, characterized in that: the transmission device further comprises a chute and a rotating connector. The chute is fixed relative to the output shaft, the rotating connector is connected to the annular flange, and the rotating connector is rotatably connected to the chute. When the front side of the annular flange faces the working accessory and is nested on the output shaft, the transmission device is in the first state; when the back side of the annular flange faces the working accessory and is nested on the output shaft, the transmission device is in the second state.

4. The power tool system according to claim 2, characterized in that: the second transmission part is a plurality of non - continuous circumferentially distributed teeth protruding from the back side of the annular flange.

5. The power tool system according to claim 1, characterized in that: when the transmission device is in the first state, the first transmission part protrudes from the second transmission part in the direction of the central axis; when the transmission device is in the second state, the second transmission part protrudes from the first transmission part in the direction of the central axis.

6. The power tool system according to claim 5, characterized in that: The first transmission part is fixedly connected to the end of the output shaft or integrally formed with the end of the output shaft. The second transmission part is nested on the end of the output shaft and can slide around the output shaft. The second transmission part has a first sliding position and a second sliding position. When the second transmission part is in the first sliding position, the transmission device is in a first state; when the second transmission part is in the second sliding position, the transmission device is in a second state.

7. The power tool system according to claim 6, wherein: the clamping device includes a first clamping position and a second clamping position; when the second transmission part is in the first sliding position, the first type of working accessory is clamped at the first clamping position; when the second transmission part is in the second sliding position, the second type of working accessory is clamped at the second clamping position.

8. The power tool system according to claim 5, wherein: the transmission device further includes a fixing member, the fixing member is fixedly connected to the end of the output shaft or integrally formed with the end of the output shaft, and the first transmission part and the second transmission part are nested on the fixing member.

9. The power tool system according to claim 8, wherein: at least a guide rail is formed on the outside of the fixing member for guiding the relative rotation of the first transmission part and the second transmission part.

10. A power tool, comprising: a motor; a housing for accommodating the motor; an output shaft driven by the motor to rotate or swing about a central axis; a transmission device configured to be connected to the output shaft, rotate synchronously with the output shaft, and cooperate with a working accessory to transfer torque from the output shaft to the working accessory; a clamping device for clamping the working accessory in the direction of the central axis, and the clamping device cooperates with the transmission device to jointly fix the working accessory; wherein: the transmission device includes: a first transmission part including a first engaging part cooperating with a first type of working accessory, and the first engaging part transfers torque to the first type of working accessory; a second transmission part including a second engaging part cooperating with a second type of working accessory, and the second engaging part transfers torque to the second type of working accessory; at least one of the first transmission part and the second transmission part is configured to be movable so that the transmission device can be switched at least between a first state and a second state. When the transmission device is in the first state, it cooperates with the first type of working accessory, and when the transmission device is in the second state, it cooperates with the second type of working accessory; the first transmission part and the second transmission part can relatively expand and contract to switch the positions of the first transmission part and the second transmission part.

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