Clutch device for electric tool and electric tool

Abstract

The utility model discloses a clutch device for an electric tool and the electric tool, and belongs to the field of electric tools, the technical scheme is mainly that the clutch device for the electric tool comprises an output shaft, a clutch disc is arranged on the output shaft between a clutch frame and a driving wheel, and the clutch disc and the output shaft are circumferentially fixed and axially connected in a sliding mode; at least one sliding channel is arranged between the clutch frame and the clutch disc, the sliding channel tends to be gradually away from the output shaft in the extending direction, the axial width of the sliding channel is gradually reduced along with the direction away from the output shaft, and a movable part is movably connected into the sliding channel. The movable part moves away from the output shaft in the sliding channel under the action of centrifugal force so as to push the clutch disc to axially move in the direction close to the driving wheel, and when the clutch disc abuts against the driving wheel, the output shaft drives the driving wheel to rotate through the clutch disc. The utility model is mainly used for solving the problem of overlarge load of the output shaft.

Description

Technical Field

[0001] The present application relates to the field of electric tools, and in particular to a clutch device for an electric tool and the electric tool. Background Art

[0002] Electric tools are widely used in modern society, and electric chain saws are a commonly used logging tool in the gardening market. With the development of animal husbandry and gardening at home and abroad, as well as the requirements for environmental protection at home and abroad, electric chain saws have good development prospects. Lithium-ion chain saws have developed particularly rapidly in recent years, and have quickly occupied the market with their environmental protection, energy saving, and portability.

[0003] Since chainsaws need to saw relatively hard objects under special working conditions, and the motor will be turned off when the chainsaw is stuck in the object when the operator does not operate it properly, the actuator of the electric chainsaw will be subjected to a large impact. At this time, the brake structure plays a key role. However, the existing technology uses a brake structure that stops the output shaft. Although it reduces the torsional damage to the output shaft, multiple emergency brakes or stalls will still have a great impact on the life of the output shaft. Utility Model Content

[0004] In order to overcome the deficiency in the prior art that the load directly acts on the output shaft when the power tool suddenly brakes or stalls, the present application provides a clutch device for the power tool and the power tool, which can solve the problem of excessive load on the output shaft.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a clutch device for an electric tool, comprising an output shaft, a clutch frame connected to the output shaft, a drive wheel axially connected to the output shaft, the drive wheel and the output shaft rotatingly cooperate, a clutch plate is provided on the output shaft between the clutch frame and the drive wheel, the clutch plate is circumferentially fixed to the output shaft and axially slidably connected, at least one sliding channel is provided between the clutch frame and the clutch plate, the extension direction of the sliding channel tends to gradually move away from the output shaft, the axial width of the sliding channel gradually decreases as it moves away from the output shaft, a movable part is movably connected in the sliding channel, and the movable part moves in the sliding channel away from the output shaft under the action of centrifugal force to push the clutch plate to move axially in the direction close to the drive wheel. When the clutch plate is pressed against the drive wheel, the output shaft drives the drive wheel to rotate through the clutch plate.

[0006] After adopting the above technical solution, unlike the rigid power transmission of traditional electric tools, the output shaft of the present application transmits power through the friction force generated by the surface contact between the clutch plate and the drive wheel. The principle is that when the output shaft rotates, it drives the clutch frame and the clutch plate to rotate synchronously. At the same time, the movable parts in the sliding channel move in the direction away from the output shaft due to the action of centrifugal force, causing the movable parts to gradually push the clutch plate closer to and press against the drive wheel when moving away from the output shaft, so that the drive wheel 3 can drive the external actuator to rotate synchronously to work. When this end of the drive wheel encounters a stall or sudden brake, the torsional impact force of the output shaft is slowed down by the slippage of the drive wheel and the clutch plate. Since the drive wheel and the clutch plate rely on friction to rotate The transmission is carried out in a row, so this soft transmission of power can prevent the output shaft from being damaged by a large impact force, and can reduce the impact force by the slippage of the drive wheel and the clutch plate. The present application has the following advantages: through the friction transmission between the clutch plate and the drive wheel, the drive wheel can be braked suddenly when encountering special circumstances, or when power tools such as electric chain saws encounter a hard object and are blocked, it avoids direct damage to the output shaft and the motor, but wears the contact surface between the clutch plate and the drive wheel. When the contact surface does not have the ability to transmit power, the original friction force can be guaranteed by replacing the clutch plate. Compared with replacing the output shaft, it will reduce a certain amount of maintenance cost, is more economical, and can also increase the service life of the output shaft and the motor.

[0007] Furthermore, the clutch frame is provided with a sliding groove, which cooperates with the clutch plate to form the sliding channel; or the clutch plate is provided with a sliding groove, which cooperates with the clutch frame to form the sliding channel; or sliding grooves are provided on both the clutch frame and the clutch plate, and the sliding grooves on both sides correspond to each other circumferentially and are combined to form a sliding channel.

[0008] By adopting the above-mentioned technical solution, the sliding channel is set on the clutch frame, which can be processed in the relatively large structural space of the clutch frame, reducing the processing difficulty. Therefore, the structure of the clutch plate can be simpler and more stable during axial sliding, reducing the instability factors caused by the complex structure; the sliding channel is set on the clutch plate, which can make the structure of the entire clutch device more compact and reduce the occupied space, and is particularly suitable for power tools with high space requirements; sliding channels are set on both the clutch frame and the clutch plate and combined to form a slide rail, so that the movement of the movable parts therein is more stable, and the space between the clutch frame and the clutch plate can be fully utilized to make the structure of the clutch device more compact.

[0009] Furthermore, when the movable part is close to one end of the output shaft in the sliding channel, there is a gap between the clutch plate and the driving wheel; when the movable part is located in the middle position of the sliding channel, the movable part will push the clutch plate to make the clutch plate and the driving wheel press tightly.

[0010] By adopting the above-mentioned technical solution, the clutch plate is separated from the drive wheel in the non-working state, which can reduce unnecessary friction and wear. Only when the movable part is in the middle position, the clutch plate and the drive wheel will be pressed together to generate friction to transmit power. When the clutch plate is worn, the overall thickness will become thinner. At this time, the movable part can still press the clutch plate and the drive wheel together by continuing to move away from the output shaft, ensuring that the positive pressure between the clutch plate and the drive wheel remains unchanged, leaving a certain margin for wear of the clutch plate, thereby ensuring the service life of the clutch plate. There is no need to frequently replace the clutch plate due to minor wear, thereby reducing the cost of use and maintenance frequency.

[0011] Furthermore, the movable member can partially extend out of the sliding channel and abut against the clutch plate when in the middle position.

[0012] The aforementioned technical solution provides a more stable support force for the clutch plate when the movable member abuts against the clutch plate in the intermediate position, helping to prevent the clutch plate from shaking or becoming unstable during power transmission, thereby improving the operational stability of the entire clutch device.

[0013] Furthermore, the output shaft is provided with a spring for moving the clutch plate closer to the clutch frame.

[0014] By adopting the above technical solution, the spring setting can quickly push the clutch plate back to a position close to the clutch frame when the force of the movable part disappears, ensuring that the clutch plate is separated from the drive wheel in the non-working state, reducing unnecessary friction and wear.

[0015] Furthermore, on the output shaft, a positioning piece is provided on each of the two axial side surfaces of the driving wheel, and the spring is provided between the positioning piece and the clutch plate.

[0016] By adopting the above-mentioned technical solution, positioning parts are provided on both axial sides of the driving wheel, so that the axial position of the driving wheel can be positioned more accurately. The positioning parts can ensure that the driving wheel always remains in the correct position during operation without axial displacement, and ensure that the clutch plate cooperates well with the driving wheel and the clutch frame. At the same time, the spring is provided between the positioning part and the clutch plate. The positioning part provides a stable support point for the spring, so that the spring can play a more effective role and push the clutch plate to the correct position.

[0017] Furthermore, the movable part is spherical in shape, or the movable part is a slider slidably connected to the sliding channel.

[0018] By adopting the above-mentioned technical solution, when the movable part is spherical, the movement in the sliding channel is more flexible and can respond more quickly to changes in centrifugal force, thereby quickly pushing the clutch plate close to the drive wheel or separating from the clutch plate under specific circumstances when needed, and the contact area between the spherical surface and the sliding channel is relatively small, and the friction generated during the movement is also small, which reduces energy loss and improves the efficiency of the clutch device. Due to the symmetry of the sphere, no matter where it is in the sliding channel, it can better adapt to the shape changes of the channel, and the push on the clutch plate is more uniform, which improves the stability and reliability of the clutch device; when the movable part is a slider, it usually has a larger contact area and better structural strength, can withstand larger centrifugal force and friction, and is suitable for high-load power tools. The slider and the sliding channel can be designed to fit more tightly, so that the movement accuracy of the movable part during the sliding process is higher, and the contact state between the clutch plate and the drive wheel can be more accurately controlled.

[0019] Furthermore, the shape of the sliding channel is one of a straight groove and a curved groove.

[0020] By adopting the above-mentioned technical solution, the straight groove can provide a relatively stable guide for the movable parts, making it less likely for the movable parts to deviate or shake during movement, thereby ensuring stable and reliable contact between the clutch plate and the drive wheel; the curved groove can make the engagement and separation process of the clutch plate and the drive wheel smoother by reasonably designing the changes in centrifugal force, reducing impact and vibration, and improving the service life and working stability of the power tool.

[0021] Furthermore, the sliding channel extends outward in the radial direction of the output shaft.

[0022] By adopting the above-mentioned technical solution, the sliding channel extending radially outward along the output shaft can enable the movable part to better utilize the centrifugal force when the output shaft rotates. As the rotation speed of the output shaft increases, the centrifugal force will also increase, and the movable part will move more quickly along the radially outward sliding channel, thereby more effectively pushing the clutch plate closer to and pressing against the drive wheel, thereby realizing reliable transmission of power.

[0023] An electric tool comprises a housing and the above-mentioned clutch device, wherein a motor is provided in the housing, a drive shaft of the motor is connected to the output shaft on the clutch device, a brake belt with a semi-enclosed structure is provided on the outer side of the drive wheel on the clutch device, a gap exists between the brake belt and the drive wheel, one end of the brake belt is fixedly connected to the housing, and the other end extends to the outside of the housing and is equipped with a handle, and the handle is connected to an electronic controller for tightening the brake belt and shutting off the power to the motor.

[0024] By adopting the above-mentioned technical solution, when the emergency brake of the power tool is triggered, the operator pulls the handle to trigger the switch of the electronic controller, immediately tightening the brake belt, so that the brake belt of the semi-enclosed structure holds the drive wheel tightly, and at the same time cuts off the power of the motor. The friction force of the brake belt reduces the speed of the drive wheel, and the clutch is also triggered at the same time to achieve emergency braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present application will be further described below with reference to the accompanying drawings:

[0026] Figure 1 A schematic diagram of a clutch device for a power tool according to the present application;

[0027] Figure 2 A full cross-sectional view of a clutch device for an electric tool in a first state;

[0028] Figure 3 is a full cross-sectional view of a clutch device for an electric tool in a second state;

[0029] Figure 4 A schematic diagram of the brake band assembly of a power tool;

[0030] Figure 5 The figure is a schematic diagram of an electric tool.

[0031] Description of the drawings: 1. Output shaft; 2. Clutch frame; 3. Drive wheel; 31. Shaft section; 32. Transmission section; 321. Second transmission surface; 33. Enclosing section; 4. Clutch plate; 41. First transmission surface; 5. Sliding channel; 6. Movable part; 7. Spring; 8. Positioning part; 9. Housing; 91. Brake belt; 10. Handle. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0033] The terms "first," "second," and so on (if any) in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or precedence. Even if "second" is used before a technical feature to distinguish it, it does not necessarily imply the presence of "first." It should be understood that in this application, "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. It should be understood that in this application, "plurality" refers to two or more. "And / or" is merely a description of an association between related objects, indicating that three relationships can exist. For example, "X and / or Y" can mean: X exists alone, X and Y exist simultaneously, or Y exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. "Including X, Y, and Z" means that all three of X, Y, and Z are included. "Including X, Y, or Z" means that one of X, Y, and Z is included. "Including X, Y, and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0034] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0035] like Figures 1 to 3 As shown, the present application provides a clutch device for an electric tool, comprising an output shaft 1, a clutch frame 2 being connected to the output shaft 1, a drive wheel 3 being axially connected to the output shaft 1, and a clutch plate 4 being provided on the output shaft 1 between the clutch frame 2 and the drive wheel 3, the clutch plate 4 being circumferentially fixed to the output shaft 1 and axially slidingly connected, at least one sliding channel 5 being provided between the clutch frame 2 and the clutch plate 4, the extension direction of the sliding channel 5 tending to gradually move away from the output shaft 1, the axial width H of the sliding channel 5 gradually decreasing as it moves away from the output shaft 1, a movable part 6 being movably connected in the sliding channel 5, the movable part 6 moving in the sliding channel 5 away from the output shaft 1 under the action of centrifugal force to push the clutch plate 4 to move axially in the direction close to the drive wheel 3, and when the clutch plate 4 is pressed against the drive wheel 3, the output shaft 1 drives the drive wheel 3 to rotate through the clutch plate 4.

[0036] After adopting the above technical solution, unlike the rigid power transmission of traditional electric tools, the output shaft 1 of the present application transmits power through the friction force generated by the surface contact between the clutch plate 4 and the drive wheel 3. The principle is that when the output shaft 1 rotates, it drives the clutch frame 2 and the clutch plate 4 to rotate synchronously. At the same time, the movable part 6 in the sliding channel 5 moves in the direction away from the output shaft 1 due to the action of centrifugal force, causing the movable part 6 to gradually push the clutch plate 4 closer to and press against the drive wheel 3 when moving away from the output shaft 1, so that the drive wheel 3 can drive the external actuator to rotate synchronously to work. When this end of the drive wheel 3 encounters a stall or sudden brake, the torsional impact force of the output shaft 1 is slowed down by the slippage of the drive wheel 3 and the clutch plate 4. Since the drive wheel 3 and the clutch plate 4 rely on The transmission is carried out by friction force, so this soft transmission of power can prevent the output shaft 1 from being damaged by a large impact force, and can reduce the impact force by the slipping of the drive wheel 3 and the clutch plate 4. The present application has the following advantages: through the friction transmission between the clutch plate 4 and the drive wheel 3, the drive wheel 3 can brake suddenly when encountering special circumstances, or when an electric tool such as an electric chain saw encounters a hard object and is blocked, it avoids direct damage to the output shaft 1 and the motor, but wears the contact surface between the clutch plate 4 and the drive wheel 3. When the contact surface does not have the ability to transmit power, the original friction force can be ensured by replacing the clutch plate 4. Compared with replacing the output shaft 1, it will reduce a certain amount of maintenance costs, is more economical, and can also increase the service life of the output shaft 1 and the motor.

[0037] Specifically, the axial movement distance of the movable part 6 in the sliding channel 5 is greater than or equal to the axial distance between the clutch plate 4 and the driving wheel 3; one end of the sliding channel 5 gradually moves away from the output shaft 1, while the other end can be gradually close to the output shaft 1.

[0038] Preferably, there are more than two sliding channels 5, and they are evenly distributed along the circumference.

[0039] Furthermore, a sliding groove is provided on the clutch frame 2 , and the sliding groove cooperates with the clutch plate 4 to form the sliding channel 5 .

[0040] By adopting the above-mentioned technical solution, the sliding groove is set on the clutch frame 2, which can be processed with the relatively large structural space of the clutch frame 2, reducing the processing difficulty. Therefore, the structure of the clutch plate 4 can be simpler and more stable during the axial sliding process, reducing the instability factors caused by the complex structure.

[0041] Furthermore, when the movable part 6 is close to one end of the output shaft 1 in the sliding channel 5, there is a gap between the clutch plate 4 and the driving wheel 3; when the movable part 6 is located in the middle position of the sliding channel 5, the movable part 6 will push the clutch plate 4 so that the clutch plate 4 is pressed tightly against the driving wheel 3.

[0042] By adopting the above-mentioned technical solution, the clutch plate 4 is separated from the drive wheel 3 in the non-working state, which can reduce unnecessary friction and wear. Only when the movable part 6 is in the middle position, the clutch plate 4 and the drive wheel 3 will be pressed together to generate friction to transmit power. When the clutch plate 4 is worn, the overall thickness will become thinner. At this time, the movable part 6 can still press the clutch plate 4 against the drive wheel 3 by continuing to move away from the output shaft 1, ensuring that the positive pressure between the clutch plate 4 and the drive wheel 3 remains unchanged, leaving a certain margin for wear of the clutch plate 4, thereby ensuring the service life of the clutch plate 4. There is no need to frequently replace the clutch plate 4 due to slight wear, thereby reducing the cost of use and maintenance frequency.

[0043] It can be understood that the middle position mentioned above refers to any position between the two ends of the sliding channel 5.

[0044] Furthermore, the movable member 6 abuts against the clutch plate 4 when in the middle position.

[0045] With the above technical solution, when the movable member 6 partially abuts against the clutch plate 4 in the middle position, it can provide a more stable support force for the clutch plate 4. During the power transmission process, it helps to prevent the clutch plate 4 from shaking or becoming unstable, thereby improving the operational stability of the entire clutch device.

[0046] Furthermore, a spring 7 is provided on the output shaft 1 to move the clutch plate 4 closer to the clutch frame 2 .

[0047] By adopting the above-mentioned technical solution, the setting of the spring 7 can quickly push the clutch plate 4 back to a position close to the clutch frame 2 when the force of the movable part 6 disappears, ensuring that the clutch plate 4 is separated from the drive wheel 3 in the non-working state, reducing unnecessary friction and wear.

[0048] It can be understood that the spring 7 can be a tension spring or a compression spring, and can apply elastic force in two directions to make the clutch plate 4 close to the clutch frame 2; when the movable part 6 can extend out of the movable channel and abut against the clutch plate 4 at any position, the function of the spring 7 can also ensure that the movable part 6 is always in the movable channel. On the side close to the output shaft 1, and prevent the movable part 6 from rolling randomly due to gravity when the fuselage is turned over.

[0049] Furthermore, a positioning member 8 is provided on each of the two axial side surfaces of the driving wheel 3 on the output shaft 1 , and the spring 7 is provided between the positioning member 8 and the clutch plate 4 .

[0050] By adopting the above-mentioned technical solution, positioning members 8 are provided on both axial sides of the driving wheel 3, so that the axial position of the driving wheel 3 can be positioned more accurately. The positioning member 8 can ensure that the driving wheel 3 always remains in the correct position during operation without generating axial displacement, and ensures that the clutch plate 4 cooperates well with the driving wheel 3 and the clutch frame 2. At the same time, the spring 7 is provided between the positioning member 8 and the clutch plate 4. The positioning member 8 provides a stable support point for the spring 7, so that the spring 7 can play a more effective role and push the clutch plate 4 to the correct position. Moreover, since the driving wheel 3 and the output shaft 1 are in rotational cooperation, using the positioning member 8 as the support point of the spring 7 can prevent the spring 7 and the driving wheel 3 from rotational wear.

[0051] Specifically, the positioning member 8 is a retaining spring, which is used to determine the axial position of the driving wheel 3 .

[0052] Furthermore, the movable member 6 is spherical in shape.

[0053] By adopting the above-mentioned technical solution, when the movable part 6 is spherical, the movement in the sliding channel 5 is more flexible and can respond to changes in centrifugal force more quickly, thereby quickly pushing the clutch plate 4 close to the drive wheel 3 when needed or separating from the clutch plate 4 under specific circumstances. In addition, the contact area between the spherical surface and the sliding channel 5 is relatively small, and the friction generated during the movement is also small, which reduces energy loss and improves the efficiency of the clutch device. Due to the symmetry of the sphere, no matter where it is in the sliding channel 5, it can better adapt to the shape changes of the channel, and the push on the clutch plate 4 is more uniform, which improves the stability and reliability of the clutch device.

[0054] Furthermore, the shape of the sliding channel 5 is a straight groove, and in this case the movable member 6 can be a sphere or a cylinder.

[0055] By adopting the above-mentioned technical solution, the straight groove can provide a relatively stable guide for the movable part 6, so that the movable part 6 is not prone to deviation or shaking during movement, thereby ensuring stable and reliable contact between the clutch plate 4 and the drive wheel 3.

[0056] Specifically, the straight groove includes an oblique straight groove in which a straight line formed in an extending direction is inclined to a virtual radius line of the output shaft.

[0057] Furthermore, the sliding channel 5 extends outward in the radial direction of the output shaft 1 .

[0058] By adopting the above-mentioned technical solution, the sliding channel 5 extending radially outward along the output shaft 1 can enable the movable part 6 to better utilize the centrifugal force when the output shaft 1 rotates. As the rotation speed of the output shaft 1 increases, the centrifugal force will also increase, and the movable part 6 will move more quickly along the radially outward sliding channel 5, thereby more effectively pushing the clutch plate 4 close to and pressing against the drive wheel 3, thereby realizing reliable power transmission.

[0059] In another embodiment, a sliding groove is provided on the clutch plate 4 , and the sliding groove cooperates with the clutch frame 2 to form the sliding channel 5 .

[0060] By adopting the above-mentioned technical solution, the sliding groove is provided on the clutch plate 4, which can make the structure of the entire clutch device more compact and reduce the occupied space, and is particularly suitable for power tools with high space requirements.

[0061] In another embodiment, sliding grooves are provided on both the clutch frame 2 and the clutch plate 4 , and the sliding grooves on both sides correspond to each other in the circumferential direction and are combined to form a sliding channel 5 .

[0062] By adopting the above-mentioned technical solution, sliding grooves are provided on both the clutch frame 2 and the clutch plate 4 and combined to form a sliding channel 5, so that the movement of the movable part 6 therein is more stable, and the space between the clutch frame 2 and the clutch plate 4 can be fully utilized, making the structure of the clutch device more compact.

[0063] In another embodiment, an alternative solution for reducing the axial width H of the sliding channel is as follows: 1. The depth of the sliding groove remains unchanged, the clutch plate has a first transmission surface 41 in contact with the drive wheel and a contact surface arranged away from the first transmission surface 41 and in contact with the movable part, and the contact surface gradually moves away from the first transmission surface 41 radially outward; 2. The bottom wall of the sliding groove gradually approaches the contact surface radially outward, and the contact surface gradually moves away from the first transmission surface 41 radially outward.

[0064] Specifically, the driving wheel 3 includes a shaft section 31, a transmission section 32 and an enclosing section 33 extending axially along the output shaft 1. The enclosing section 33 surrounds the outside of the clutch frame 2 and the clutch plate 4. The transmission section 32 is connected between the shaft section 31 and the enclosing section 33. The transmission section 32 has a second transmission surface 321 facing the clutch plate 4. The first transmission surface 41 and the second transmission surface 321 are both rough surfaces. Positioning members 8 are provided at both ends of the shaft section 31.

[0065] In another embodiment, the movable member 6 does not need to extend out of the sliding channel 5, and a corresponding rib on the clutch plate 4 extends into the sliding channel 5, and the rib and the bottom surface of the sliding channel 5 gradually approach each other in the direction away from the output shaft.

[0066] In another embodiment, the movable member 6 is a slider slidably connected to the sliding channel 5 .

[0067] When the above-mentioned technical solution is adopted, when the movable part 6 is a slider, it usually has a larger contact area and better structural strength, can withstand larger centrifugal force and friction, and is suitable for high-load power tools. The cooperation between the slider and the sliding channel 5 can be designed to be tighter, so that the movement accuracy of the movable part 6 during the sliding process is higher, and the contact state between the clutch plate 4 and the drive wheel 3 can be more accurately controlled.

[0068] In another embodiment, the sliding channel 5 is in the shape of a curved groove.

[0069] By adopting the above-mentioned technical solution, the curved groove can make the engagement and separation process of the clutch plate 4 and the drive wheel 3 smoother by reasonably designing the change of centrifugal force, reduce impact and vibration, and improve the service life and working stability of the power tool.

[0070] Specifically, the bottom surface of the sliding channel 5 gradually approaches the clutch plate 4 in the direction from close to the output shaft to away from the output shaft, so that the movable member 6 in the sliding channel 5 can gradually approach the clutch plate 4 in the process of moving away from the output shaft.

[0071] like Figures 4 and 5 As shown, an electric tool includes a housing 9 and the above-mentioned clutch device, a motor is provided in the housing 9, the transmission shaft of the motor is connected to the output shaft 1 on the clutch device, and a brake belt 91 with a semi-enclosed structure is provided on the outside of the driving wheel 3 on the clutch device. There is a gap between the brake belt 91 and the driving wheel 3, one end of the brake belt 91 is fixedly connected to the housing 9, and the other end extends to the outside of the housing 9 and is installed with a handle 10, and the handle 10 is connected to an electronic controller for tightening the brake belt 91 and turning off the power of the motor.

[0072] By adopting the above-mentioned technical solution, when the emergency brake of the power tool is triggered, the operator pulls the handle 10 to trigger the switch of the electronic controller, immediately tightening the brake belt 91, so that the semi-enclosed structure of the brake belt 91 holds the drive wheel 3 tightly, and at the same time cuts off the power of the motor. The friction force of the brake belt 91 reduces the speed of the drive wheel 3, and the clutch is also triggered at the same time to achieve emergency braking.

[0073] Specifically, a chain plate is fixed to the outer shell, and a sprocket is provided on the axial surface of the driving wheel 3 for driving the actuator chain saw sleeved on the chain plate to rotate synchronously.

[0074] In addition to the above-mentioned preferred embodiments, the present application also has other implementation methods. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A clutch device for an electric tool, characterized in that: The invention comprises an output shaft (1), wherein a clutch frame (2) is connected to the output shaft (1), a driving wheel (3) is axially connected to the output shaft (1), the driving wheel (3) and the output shaft (1) are rotationally matched, a clutch plate (4) is provided on the output shaft (1) between the clutch frame (2) and the driving wheel (3), the clutch plate (4) is circumferentially fixed to the output shaft (1) and axially slidably connected, at least one sliding channel (5) is provided between the clutch frame (2) and the clutch plate (4), and the extension direction of the sliding channel (5) is gradually The sliding channel (5) has a tendency to move away from the output shaft (1), and the axial width of the sliding channel (5) gradually decreases as it moves away from the output shaft (1). A movable part (6) is movably connected in the sliding channel (5). Under the action of centrifugal force, the movable part (6) moves in the sliding channel (5) away from the output shaft (1) to push the clutch plate (4) to move axially in a direction close to the drive wheel (3). When the clutch plate (4) is pressed against the drive wheel (3), the output shaft (1) drives the drive wheel (3) to rotate through the clutch plate (4).

2. A clutch device for an electric tool according to claim 1, characterized in that: The clutch frame (2) is provided with a sliding groove, which cooperates with the clutch plate (4) to form the sliding channel (5); or the clutch plate (4) is provided with a sliding groove, which cooperates with the clutch frame (2) to form the sliding channel (5); or sliding grooves are provided on both the clutch frame (2) and the clutch plate (4), and the sliding grooves on both sides are combined to form the sliding channel (5).

3. The clutch device for an electric tool according to claim 1, characterized in that: When the movable member (6) is close to one end of the output shaft (1) in the sliding channel (5), a gap exists between the clutch plate (4) and the driving wheel (3); when the movable member (6) is located in the middle position of the sliding channel (5), the movable member (6) pushes the clutch plate (4) so that the clutch plate (4) and the driving wheel (3) are pressed tightly.

4. A clutch device for an electric tool according to claim 3, characterized in that: The movable member (6) abuts against the clutch plate (4) when in the middle position.

5. The clutch device for an electric tool according to claim 1, characterized in that: The output shaft (1) is provided with a spring (7) for moving the clutch plate (4) closer to the clutch frame (2).

6. The clutch device for an electric tool according to claim 5, characterized in that: On the output shaft (1), a positioning piece (8) is provided on each of the two axial side surfaces of the driving wheel (3), and the spring (7) is provided between the positioning piece (8) and the clutch plate (4).

7. The clutch device for an electric tool according to claim 1, characterized in that: The movable part (6) is in the shape of a sphere or a cylinder, or the movable part (6) is a sliding block slidably connected to the sliding channel (5).

8. A clutch device for an electric tool according to any one of claims 1 to 7, characterized in that: The shape of the sliding channel (5) is one of a straight groove and a curved groove.

9. A clutch device for an electric tool according to any one of claims 1 to 7, characterized in that: The sliding channel (5) extends outward in the radial direction of the output shaft (1).

10. An electric tool, characterized in that: The invention comprises a housing (9) and a clutch device as described in any one of claims 1 to 9, wherein a motor is provided in the housing (9), a transmission shaft of the motor is connected to an output shaft (1) on the clutch device, a brake belt (91) of a semi-enclosed structure is provided on the outside of the driving wheel (3) on the clutch device, a gap exists between the brake belt (91) and the driving wheel (3), one end of the brake belt (91) is fixedly connected to the housing (9), and the other end extends to the outside of the housing (9) and is provided with a handle (10), and the handle (10) is connected to an electronic controller for tightening the brake belt (91) and shutting off the power of the motor.

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