A power tool

Abstract

The present invention provides a power tool, comprising: a housing, a power output assembly and a gear shifting assembly. Among them, a motor is fixedly installed inside the housing, and a first gear is fixedly installed at the end of the rotating shaft of the motor; the power output assembly mainly consists of a driving output shaft, a driven output shaft, a second gear, a high-speed driving gear, a low-speed driving gear, a high-speed driven gear and a low-speed driven gear, and the gear shifting assembly mainly consists of an annular mounting seat, a gear shifting knob, a shrapnel, a fixing ring, a transmission plate fixing pin, a transmission plate A, a transmission plate B, a compression spring, a gear shifting knob transmission pin and a gear shifting clutch sleeve. For the power tool provided by the present invention, the arranged gear shifting clutch sleeve will not axially sway back and forth on the driven output shaft by itself, so that the unstable phenomenon of gear jumping can be avoided during the use of the power tool. The structure is simple, the gear shifting is convenient, and the performance is more stable.

Description

Technical Field

[0001] The present invention relates to the field of electromechanical technology, and more particularly to a power tool. Background Art

[0002] Chinese Patent Publication No. CN217784130U discloses a non-contact shift water drill, which includes a main body connector and a shift assembly. The main body connector includes a base and a housing. An output shaft, a first gear shaft and a second gear shaft are movably connected to the base. A limit gear is installed on the first gear shaft. A shift connector is movably connected to the second gear shaft. A first shift gear and a second shift gear are fixedly installed on the second gear shaft. The shift assembly includes a shift knob, which is movably connected to the housing. One side of the shift knob is provided with a toggle fixed seat and a shift knob limit block. An elastic element is wound around the toggle fixed seat. One end of the elastic element away from the toggle fixed seat cooperates with the shift connector through a connecting member. A fixing piece for fixing the elastic element is also sleeved on the toggle fixed seat. One end of the shift knob limit block is provided with a return spring.

[0003] For the above non-contact shift water drill, only by rotating the shift knob can the gear shift be realized, which improves the working efficiency of the water drill. However, the above non-contact shift water drill has an unstable phenomenon of gear skipping during use and needs to be further improved.

[0004] Therefore, a power tool is proposed. Summary of the Invention

[0005] The present invention aims to solve the problems raised in the background art and provides a power tool.

[0006] The specific technical solution is as follows:

[0007] A power tool, comprising:

[0008] A housing, inside which a motor is fixedly installed, and a first gear is fixedly installed at the end of the rotating shaft of the motor;

[0009] A power output assembly, comprising a driving output shaft, a driven output shaft, a second gear, a high-speed driving gear, a low-speed driving gear, a high-speed driven gear and a low-speed driven gear, wherein the driving output shaft is rotatably mounted inside the housing through a bearing, the driven output shaft is rotatably mounted inside the housing through a bearing, and one end of the driven output shaft extends to the outside of the housing, the second gear, the high-speed driving gear and the low-speed driving gear are all fixedly sleeved on the driving output shaft, and the second gear is meshed with the first gear, the high-speed driven gear and the low-speed driven gear are all rotatably sleeved on the driven output shaft through a bearing, the high-speed driven gear and the high-speed driving gear are arranged in cooperation with each other, and the low-speed driven gear and the low-speed driving gear are arranged in cooperation with each other;

[0010] The shift assembly comprises an annular mounting seat, a shift knob, a spring, a fixing ring, a transmission plate fixing pin, a transmission plate A, a transmission plate B, a compression spring, a shift knob transmission pin and a shift clutch sleeve, wherein the annular mounting seat is integrally formed on the side of the shell, the shift knob is rotatably mounted on the annular mounting seat, and a clamping groove is provided on the inner side of the shift knob, the spring is clamped in the clamping groove, the fixing ring is fixedly mounted inside the annular mounting seat, and two spring fixing grooves for clamping the spring are symmetrically provided on the outer ring surface of the fixing ring, the transmission plate fixing pin is fixedly mounted inside the shell, and the transmission plate fixing pin is arranged parallel to the driven output shaft, the transmission plate A, the transmission plate B and the compression spring are movably sleeved on the transmission plate fixing pin, the transmission plate B is transmission-connected to the transmission plate A, the two ends of the compression spring abut between the transmission plate A and the transmission plate B, the shift knob transmission pin is fixedly mounted on the inner end surface of the shift knob, and the end of the shift knob transmission pin away from the shift knob is inserted into the gap between one end of the transmission plate A and one end of the transmission plate B, the shift clutch sleeve is slidably sleeved on the driven output shaft, and the shift clutch sleeve is located between the high-speed driven gear and the low-speed driven gear, the edge of the shift clutch sleeve extends into the gap, and the shift clutch sleeve cannot rotate relative to the driven output shaft, wherein:

[0011] When the shift knob is rotated so that the spring sheet is inserted into the slot near the high-speed driven gear, the shift knob transmission pin drives the transmission plate B to push the compression spring to drive the transmission plate A to drive the shift clutch sleeve to move toward the high-speed driven gear, so that the side of the shift clutch sleeve is meshed with the side of the high-speed driven gear;

[0012] When the shift knob is rotated so that the elastic piece is snapped into the card slot on the side close to the low-speed driven gear, the transmission pin of the shift knob drives the transmission plate A to push the compression spring to drive the transmission plate B to drive the shift clutch sleeve to move towards the low-speed driven gear, so that the side of the shift clutch sleeve meshes with the side of the low-speed driven gear.

[0013] The above-mentioned power tool, wherein: a battery slot is integrally formed at the bottom of the housing, and a circuit board is fixedly installed inside the housing. A storage battery is detachably installed inside the battery slot. The storage battery is electrically connected to the circuit board, and the circuit board is electrically connected to the motor.

[0014] The above-mentioned power tool, wherein: a main handle is fixedly installed between one end of the housing far from the driven output shaft and the battery slot. A normally open power switch is installed inside the main handle, and the normally open power switch is connected in series between the circuit board and the motor.

[0015] The above-mentioned power tool, wherein: an auxiliary handle is fixedly installed on the side of one end of the housing close to the driven output shaft through a clamp, and the auxiliary handle is arranged in cooperation with the main handle.

[0016] The above-mentioned power tool, wherein: an anti-slip rubber sleeve is sleeved on the auxiliary handle.

[0017] The above-mentioned power tool, wherein: a power indicator for displaying the power of the storage battery is embedded in the top of the housing, and the power indicator is electrically connected to the circuit board.

[0018] The above-mentioned power tool, wherein: a first heat dissipation hole is opened at the position corresponding to the motor on the side wall of the housing, and a second heat dissipation hole is opened at the position corresponding to the circuit board on the side wall of the housing.

[0019] The above-mentioned power tool, wherein: a water spraying channel is reserved inside one end of the driven output shaft located outside the housing, and a water inlet communicated with the water spraying channel is opened on the side of the driven output shaft. Two water seals are installed on both sides of the water inlet on the driven output shaft. The outer ring surfaces of the two water seals are both hermetically connected to the inner wall of the housing. A connection port is fixedly installed at the bottom of the housing. The connection port is located between the two water seals and is communicated with the water inlet.

[0020] The above-mentioned power tool, wherein: a water pipe connector is communicated and installed on the connection port, and a valve is installed on the water pipe connector.

[0021] The above-mentioned power tool, wherein: a cylindrical groove is formed through the driven output shaft, a pressing spring is installed inside the cylindrical groove, positioning beads are fixedly installed at both ends of the pressing spring, two annular positioning grooves are formed on the inner ring surface of the shifting clutch sleeve. When the side of the shifting clutch sleeve meshes with the side of the high-speed driven gear, the positioning bead enters the annular positioning groove on the side close to the high-speed driven gear. When the side of the shifting clutch sleeve meshes with the side of the low-speed driven gear, the positioning bead enters the annular positioning groove on the side close to the low-speed driven gear.

[0022] The present invention has the following beneficial effects:

[0023] The shifting component provided by the power tool of the present invention mainly consists of an annular mounting seat, a shifting knob, a spring piece, a fixing ring, a transmission plate fixing pin, transmission plate A, transmission plate B, a compression spring, a shifting knob transmission pin and a shifting clutch sleeve. With the mutual cooperation of the annular mounting seat, the shifting knob, the spring piece, the fixing ring, the card slot, the transmission plate fixing pin, transmission plate A, transmission plate B, the compression spring and the shifting knob transmission pin, the shifting clutch sleeve will not axially move back and forth on the driven output shaft by itself, thus avoiding the unstable phenomenon of gear shifting during the use of the power tool. The structure is simple, the shifting is convenient, and the performance is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the power tool provided by the embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of another perspective of the power tool provided by the embodiment of the present invention;

[0026] Figure 3 is a schematic cross-sectional structural diagram of the power tool provided by the embodiment of the present invention;

[0027] Figure 4 is a schematic partial structure diagram of the power tool provided by the embodiment of the present invention Figure 1 ;

[0028] Figure 5 is a schematic partial structure diagram of the power tool provided by the embodiment of the present invention Figure 2 ;

[0029] Figure 6 is a schematic partial structure diagram of the power tool provided by the embodiment of the present invention Figure 3 ;

[0030] Figure 7 is a schematic cross-sectional structure diagram taken along the Figure 6 A-A direction in

[0031] Figure 8 is Figure 7 an enlarged structural schematic diagram at view A in

[0032] Figure 9 a structural schematic diagram of a shift knob in a power tool provided by an embodiment of the present invention;

[0033] Figure 10 a partial structural schematic diagram of a power tool provided by an embodiment of the present invention Figure 4 ;

[0034] Figure 11 a structural schematic diagram of the power tool after removing the shift knob provided by an embodiment of the present invention;

[0035] Figure 12 is Figure 11 an enlarged structural schematic diagram at view B in

[0036] In the drawings:

[0037] 1, housing; 2, power indicator; 3, main handle; 4, clamp; 5, auxiliary handle; 6, anti-slip rubber sleeve; 7, driven output shaft; 8, shift knob; 9, first heat dissipation hole; 10, second heat dissipation hole; 11, battery slot; 12, storage battery; 13, normally open power switch; 14, connection port; 15, water pipe connector; 16, motor; 17, valve; 18, circuit board; 19, high-speed driven gear; 20, low-speed driven gear; 21, shift clutch sleeve; 22, drive plate fixing pin; 23, active output shaft; 24, water seal; 25, first gear; 26, second gear; 27, high-speed active gear; 28, low-speed active gear; 29, annular positioning groove; 30, cylindrical groove; 31, abutting spring; 32, positioning bead; 33, card slot; 34, elastic sheet; 35, shift knob drive pin; 36, drive plate A; 37, drive plate B; 38, compression spring; 39, annular mounting seat; 40, fixing ring; 41, elastic sheet fixing groove; 42, water spraying channel; 43, water inlet. Detailed Embodiments

[0038] The technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0039] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0040] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, if terms such as "connection" are used to indicate the connection relationship between components, this term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] The power tool provided in this embodiment, as Figures 1 - 12 shown, includes: a housing 1, a power output assembly, and a gear shifting assembly.

[0044] Among them, a motor 16 is fixedly installed inside the housing 1, and a first gear 25 is fixedly installed at the end of the rotating shaft of the motor 16;

[0045] Among them, the power output assembly mainly consists of a driving output shaft 23, a driven output shaft 7, a second gear 26, a high-speed driving gear 27, a low-speed driving gear 28, a high-speed driven gear 19, and a low-speed driven gear 20. The driving output shaft 23 is rotatably installed inside the housing 1 through a bearing, the driven output shaft 7 is rotatably installed inside the housing 1 through a bearing, and one end of the driven output shaft 7 extends to the outside of the housing 1. The second gear 26, the high-speed driving gear 27, and the low-speed driving gear 28 are all fixedly sleeved on the driving output shaft 23, and the second gear 26 meshes with the first gear 25. The high-speed driven gear 19 and the low-speed driven gear 20 are both rotatably sleeved on the driven output shaft 7 through bearings, the high-speed driven gear 19 is arranged in cooperation with the high-speed driving gear 27, and the low-speed driven gear 20 is arranged in cooperation with the low-speed driving gear 28;

[0046] Among them, the shift component mainly consists of an annular mounting base 39, a shift knob 8, a shrapnel 34, a fixing ring 40, a drive plate fixing pin 22, a drive plate A 36, a drive plate B 37, a compression spring 38, a shift knob drive pin 35, and a shift clutch sleeve 21. The annular mounting base 39 is integrally formed on the side of the housing 1. The shift knob 8 is rotatably mounted on the annular mounting base 39, and a card slot 33 is provided inside the shift knob 8. The shrapnel 34 is snap-fitted into the card slot 33. The fixing ring 40 is fixedly mounted inside the annular mounting base 39, and two shrapnel fixing grooves 41 for clamping the shrapnel 34 are symmetrically formed on the outer ring surface of the fixing ring 40. The drive plate fixing pin 22 is fixedly mounted inside the housing 1 and is arranged parallel to the driven output shaft 7. The drive plate A 36, the drive plate B 37, and the compression spring 38 are all movably sleeved on the drive plate fixing pin 22. The drive plate B 37 is in transmission connection with the drive plate A 36. The two ends of the compression spring 38 abut between the drive plate A 36 and the drive plate B 37. The shift knob drive pin 35 is fixedly mounted on the inner end face of the shift knob 8, and the end of the shift knob drive pin 35 away from the shift knob 8 is inserted into the gap between one end of the drive plate A 36 and one end of the drive plate B 37. The shift clutch sleeve 21 is slidably sleeved on the driven output shaft 7, and the shift clutch sleeve 21 is located between the high-speed driven gear 19 and the low-speed driven gear 20. The edge of the shift clutch sleeve 21 extends into the gap, and the shift clutch sleeve 21 cannot rotate relative to the driven output shaft 7.

[0047] The electric tool adopting the above technical solution mainly consists of a housing 1, a power output component, and a shift component. When in use: when the shift knob 8 is rotated so that the shrapnel 34 is snapped into the card slot 33 on the side close to the high-speed driven gear 19, the shift knob drive pin 35 drives the drive plate B 37 to push the compression spring 38 to drive the drive plate A 36 to drive the shift clutch sleeve 21 to move towards the high-speed driven gear 19, so that the side of the shift clutch sleeve 21 meshes with the side of the high-speed driven gear 19, thereby achieving the purpose of shifting to the high gear.

[0048] When the shift knob 8 is rotated so that the shrapnel 34 is snapped into the card slot 33 on the side close to the low-speed driven gear 20, the shift knob drive pin 35 drives the drive plate A 36 to push the compression spring 38 to drive the drive plate B 37 to drive the shift clutch sleeve 21 to move towards the low-speed driven gear 20, so that the side of the shift clutch sleeve 21 meshes with the side of the low-speed driven gear 20, thereby achieving the purpose of shifting to the low gear.

[0049] With the cooperation of the annular mounting seat 39, the shift knob 8, the elastic piece 34, the fixing ring 40, the card slot 33, the drive plate fixing pin 22, the drive plate A 36, the drive plate B 37, the compression spring 38 and the shift knob drive pin 35, the shift clutch sleeve 21 will not axially sway back and forth on the driven output shaft 7 by itself, thus avoiding the unstable phenomenon of gear shifting during the use of the power tool and making the performance more stable.

[0050] Embodiment 2

[0051] The power tool provided in this embodiment is different from that in Embodiment 1 in that:

[0052] In order to facilitate the power supply of the power tool, a battery slot 11 is integrally formed at the bottom of the housing 1, and a storage battery 12 for supplying power to the motor 16 is detachably installed inside the battery slot 11. In order to facilitate the control of the operation of the motor 16, a circuit board 18 is fixedly installed inside the housing 1, and the storage battery 12 is electrically connected to the circuit board 18, and at the same time, the circuit board 18 is electrically connected to the motor 16.

[0053] In order to make the power tool easy to hold, a main handle 3 is fixedly installed between one end of the housing 1 away from the driven output shaft 7 and the battery slot 11. In order to facilitate the start of the motor 16, a normally open power switch 13 is installed inside the main handle 3, and the normally open power switch 13 is connected in series between the circuit board 18 and the motor 16. The set normally open power switch 13 can prevent the power tool from continuing to work after leaving the user's hand, thus eliminating potential safety hazards.

[0054] In order to stably operate the power tool, an auxiliary handle 5 is fixedly installed on the side of one end of the housing 1 close to the driven output shaft 7 through a clamp 4. The auxiliary handle 5 and the main handle 3 are arranged in cooperation with each other. By using the cooperation between the auxiliary handle 5 and the main handle 3, the power tool can be stably operated.

[0055] In order to improve the controllability of the auxiliary handle 5, an anti-slip rubber sleeve 6 is sleeved on the auxiliary handle 5.

[0056] In order to facilitate the display of the remaining power of the storage battery 12 so as to charge the storage battery 12 in time, a power indicator light 2 for displaying the power of the storage battery 12 is embedded at the top of the housing 1, and the power indicator light 2 is electrically connected to the circuit board 18.

[0057] In order to dissipate heat from the motor 16, a first heat dissipation hole 9 is opened on the side wall of the housing 1 corresponding to the position of the motor 16. In order to dissipate heat from the circuit board 18, a second heat dissipation hole 10 is opened on the side wall of the housing 1 corresponding to the position of the circuit board 18.

[0058] Embodiment 3

[0059] The electric tool provided in this embodiment is different from that in Embodiment 2 in that:

[0060] To facilitate the electric tool to have the function of water spraying and dust reduction, a water spraying channel 42 is reserved inside one end of the driven output shaft 7 located outside the housing 1, and a water inlet 43 communicating with the water spraying channel 42 is formed in the side of the driven output shaft 7. Two water seals 24 are installed on both sides of the water inlet 43 on the driven output shaft 7. To prevent water leakage at the water inlet 43, the outer ring surfaces of the two water seals 24 are hermetically connected to the inner wall of the housing 1. A connection port 14 is fixedly installed at the bottom of the housing 1. The connection port 14 is located between the two water seals 24 and communicates with the water inlet 43. The provided connection port 14 is used to connect a water pipe.

[0061] To facilitate the connection of the water pipe, a water pipe connector 15 is connected and installed on the connection port 14. To facilitate the control of the on-off of the water pipe connector 15, a valve 17 is installed on the water pipe connector 15.

[0062] Embodiment 4

[0063] The electric tool provided in this embodiment is different from that in Embodiment 3 in that:

[0064] To further improve the stability of the electric tool, a cylindrical groove 30 is formed through the driven output shaft 7, and a pressing spring 31 is installed inside the cylindrical groove 30. At the same time, a positioning bead 32 is fixedly installed at both ends of the pressing spring 31, and two annular positioning grooves 29 are formed on the inner ring surface of the shift clutch sleeve 21. During use, when the side of the shift clutch sleeve 21 meshes with the side of the high-speed driven gear 19, the positioning bead 32 enters the annular positioning groove 29 on the side close to the high-speed driven gear 19. When the side of the shift clutch sleeve 21 meshes with the side of the low-speed driven gear 20, the positioning bead 32 enters the annular positioning groove 29 on the side close to the low-speed driven gear 20.

[0065] The provided positioning beads 32, pressing spring 31 and two annular positioning grooves 29 cooperate with each other, which can further prevent the shift clutch sleeve 21 from axially swaying back and forth on the driven output shaft 7, thereby further improving the stability of the electric tool.

[0066] In summary, the electric tool provided in this embodiment has the following advantages:

[0067] The electric tool mainly consists of a housing 1, a power output assembly and a shift assembly. During use:

[0068] When the shift knob 8 is rotated so that the elastic piece 34 is snapped into the slot 33 near the side of the high-speed driven gear 19, the shift knob transmission pin 35 drives the transmission plate B37 to push the compression spring 38 to drive the transmission plate A36 to drive the shift clutch sleeve 21 to move towards the high-speed driven gear 19, so that the side of the shift clutch sleeve 21 meshes with the side of the high-speed driven gear 19, thereby achieving the purpose of shifting to the high gear;

[0069] When the shift knob 8 is rotated so that the elastic piece 34 is snapped into the slot 33 near the side of the low-speed driven gear 20, the shift knob transmission pin 35 drives the transmission plate A36 to push the compression spring 38 to drive the transmission plate B37 to drive the shift clutch sleeve 21 to move towards the low-speed driven gear 20, so that the side of the shift clutch sleeve 21 meshes with the side of the low-speed driven gear 20, thereby achieving the purpose of shifting to the low gear.

[0070] With the mutual cooperation of the annular mounting seat 39, the shift knob 8, the elastic piece 34, the fixing ring 40, the slot 33, the transmission plate fixing pin 22, the transmission plate A36, the transmission plate B37, the compression spring 38 and the shift knob transmission pin 35, the shift clutch sleeve 21 will not have the bad phenomenon of axial back-and-forth shaking on the driven output shaft 7 by itself, thus avoiding the unstable phenomenon of gear shifting during the use of the power tool. The structure is simple, the shifting is convenient, and the performance is more stable.

[0071] During use, a drill bit with a water outlet hole and a grinding disc can be installed at one end of the driven output shaft 7 outside the housing 1. A water pipe is connected to the water pipe connector 15 for water supply. Hold the main handle 3 and the auxiliary handle 5, and press the normally open power switch 13 to start the motor 16. Rotate the shift knob 8 to shift gears.

[0072] The above is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric tool, characterized in that, include: A housing, in which a motor is fixedly installed, and a first gear is fixedly installed at the end of the rotating shaft of the motor; A power output assembly, comprising a driving output shaft, a driven output shaft, a second gear, a high-speed driving gear, a low-speed driving gear, a high-speed driven gear and a low-speed driven gear, wherein the driving output shaft is rotatably mounted inside the housing through a bearing, the driven output shaft is rotatably mounted inside the housing through a bearing, and one end of the driven output shaft extends to the outside of the housing, the second gear, the high-speed driving gear and the low-speed driving gear are all fixedly sleeved on the driving output shaft, and the second gear is meshed with the first gear, the high-speed driven gear and the low-speed driven gear are all rotatably sleeved on the driven output shaft through a bearing, the high-speed driven gear and the high-speed driving gear are arranged in cooperation with each other, and the low-speed driven gear and the low-speed driving gear are arranged in cooperation with each other; The shift assembly comprises an annular mounting seat, a shift knob, a spring, a fixing ring, a transmission plate fixing pin, a transmission plate A, a transmission plate B, a compression spring, a shift knob transmission pin and a shift clutch sleeve, wherein the annular mounting seat is integrally formed on the side of the shell, the shift knob is rotatably mounted on the annular mounting seat, and a clamping groove is provided on the inner side of the shift knob, the spring is clamped in the clamping groove, the fixing ring is fixedly mounted inside the annular mounting seat, and two spring fixing grooves for clamping the spring are symmetrically provided on the outer ring surface of the fixing ring, the transmission plate fixing pin is fixedly mounted inside the shell, and the transmission plate fixing pin is arranged parallel to the driven output shaft, the transmission plate A, the transmission plate B and the compression spring are movably sleeved on the transmission plate fixing pin, the transmission plate B is transmission-connected to the transmission plate A, the two ends of the compression spring abut between the transmission plate A and the transmission plate B, the shift knob transmission pin is fixedly mounted on the inner end surface of the shift knob, and the end of the shift knob transmission pin away from the shift knob is inserted into the gap between one end of the transmission plate A and one end of the transmission plate B, the shift clutch sleeve is slidably sleeved on the driven output shaft, and the shift clutch sleeve is located between the high-speed driven gear and the low-speed driven gear, the edge of the shift clutch sleeve extends into the gap, and the shift clutch sleeve cannot rotate relative to the driven output shaft, wherein: When the shift knob is rotated so that the spring sheet is inserted into the slot near the high-speed driven gear, the shift knob transmission pin drives the transmission plate B to push the compression spring to drive the transmission plate A to drive the shift clutch sleeve to move toward the high-speed driven gear, so that the side of the shift clutch sleeve is meshed with the side of the high-speed driven gear; When the shift knob is rotated so that the elastic piece snaps into the card slot on the side close to the low-speed driven gear, the transmission pin of the shift knob drives the transmission plate A to push the compression spring to drive the transmission plate B to drive the shift clutch sleeve to move towards the low-speed driven gear, so that the side of the shift clutch sleeve meshes with the side of the low-speed driven gear.

2. The power tool according to claim 1, wherein, A battery slot is integrally formed at the bottom of the housing, and a circuit board is fixedly installed inside the housing. A storage battery is detachably installed inside the battery slot. The storage battery is electrically connected to the circuit board, and the circuit board is electrically connected to the motor.

3. The power tool according to claim 2, characterized in that, A main handle is fixedly installed between one end of the housing far from the driven output shaft and the battery slot. A normally open power switch is installed inside the main handle, and the normally open power switch is connected in series between the circuit board and the motor.

4. The power tool according to claim 3, characterized in that An auxiliary handle is fixedly installed on the side of one end of the housing close to the driven output shaft through a clamp, and the auxiliary handle is arranged in cooperation with the main handle.

5. The power tool according to claim 4, characterized in that, An anti-slip rubber sleeve is sleeved on the auxiliary handle.

6. The power tool according to claim 2, characterized in that, A power indicator for displaying the power of the storage battery is embedded in the top of the housing, and the power indicator is electrically connected to the circuit board.

7. The power tool according to claim 2, characterized in that, A first heat dissipation hole is formed in the side wall of the housing corresponding to the position of the motor, and a second heat dissipation hole is formed in the side wall of the housing corresponding to the position of the circuit board.

8. The electric tool according to claim 1, characterized in that, A water spraying channel is reserved inside one end of the driven output shaft located outside the housing, and a water inlet communicated with the water spraying channel is formed in the side of the driven output shaft. Two water seals are installed on both sides of the water inlet on the driven output shaft. The outer ring surfaces of the two water seals are hermetically connected to the inner wall of the housing. A connection port is fixedly installed at the bottom of the housing. The connection port is located between the two water seals and is communicated with the water inlet.

9. The electric tool according to claim 8, characterized in that, A water pipe connector is communicated and installed on the connection port, and a valve is installed on the water pipe connector.

10. The power tool according to claim 1, characterized in that, A cylindrical groove is formed through the driven output shaft. A pressing spring is installed inside the cylindrical groove. Positioning beads are fixedly installed at both ends of the pressing spring. Two annular positioning grooves are formed on the inner ring surface of the shift clutch sleeve. When the side of the shift clutch sleeve meshes with the side of the high-speed driven gear, the positioning beads enter the annular positioning groove on the side close to the high-speed driven gear. When the side of the shift clutch sleeve meshes with the side of the low-speed driven gear, the positioning beads enter the annular positioning groove on the side close to the low-speed driven gear.

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