Clutch mechanism and electric tool

Abstract

The utility model relates to the technical field of electric tools, in particular to a clutch mechanism and an electric tool. The rotating piece is provided with a protruding part extending in the radial direction. The spring element comprises arc-shaped connecting legs arranged in the circumferential direction of the rotating piece. The clutch piece can move in the axial direction of the driving shaft; the rotating piece is driven to rotate to drive the protruding part to abut against the arc-shaped connecting leg and push the abutting part of the arc-shaped connecting leg to be away from the center of the rotating piece, and the free end of the arc-shaped connecting leg pulls the clutch piece to move in the axial direction of the driving shaft so that the clutch piece can be linked with or separated from the driving shaft. The rotating part is driven to rotate reversely, and the free end pushes the clutch part to move reversely in the axial direction of the driving shaft under the action of elastic force, so that the clutch part is separated from or linked with the driving shaft. The stability of gear shifting operation of the electric tool can be ensured, and the maintainability of the tool can be improved.

Description

Technical Field

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

[0002] Power tools usually require a clutch shift mechanism to quickly switch between different modes during work, so as to meet the different work needs of the staff. Among them, the functional gear switching of the electric hammer is achieved by moving the position of the clutch gear to switch between the drill and hammer functions. In the existing clutch shift mechanism, a large number of springs are pressed and fixed on the drive shaft, making the overall structure relatively bloated. Structural jams and other faults are prone to occur during gear shifting, resulting in the gear shifting operation not being smooth. In severe cases, it will cause gear shifting failure, resulting in abnormal function switching of the power tool. In addition, due to the complex structure and assembly of the existing technology, the maintenance process is also more troublesome. Utility Model Content

[0003] The purpose of this application is to provide a clutch mechanism and an electric tool, which optimize the clutch mechanism and reduce the assembly complexity, on the one hand ensuring the stability of the electric tool's shifting operation, and on the other hand improving the maintainability of the tool.

[0004] The embodiment of the present application is implemented as follows:

[0005] On the one hand, an embodiment of the present application provides a clutch mechanism, including a spring element and a rotating member; the rotating member has a protrusion extending radially; the spring element includes an arc-shaped connecting leg arranged around the circumference of the rotating member; it also includes a drive shaft and a clutch member that can move axially along the drive shaft; the rotating member is driven to rotate, causing the protrusion to abut against the arc-shaped connecting leg, and pushes the abutment portion of the arc-shaped connecting leg away from the center of the rotating member, and the free end of the arc-shaped connecting leg pulls the clutch member to move axially along the drive shaft, so that the clutch member and the drive shaft are linked or separated; the rotating member is driven to rotate in the opposite direction, and the free end pushes the clutch member to move in the opposite direction along the axial direction of the drive shaft under the action of elastic force, so that the clutch member and the drive shaft are separated or linked.

[0006] As an optional embodiment, it further includes a guide shaft; the axis of the guide shaft is parallel to the axis of the drive shaft; the guide shaft is provided with a U-shaped fork connected to the free end; the clutch has a clamping portion inserted into the opening of the U-shaped fork, and the free end drives the clutch to move axially along the drive shaft through the U-shaped fork.

[0007] As an optional embodiment, the clutch member is a clutch gear sleeved on the drive shaft; the clamping portion is an annular protrusion arranged on the circumference of the clutch gear; the annular protrusion is radially inserted into the opening of the U-shaped fork, and the annular protrusion contacts the inner walls on both sides of the U-shaped fork.

[0008] As an optional embodiment, arc structures are provided at both ends of the U-shaped fork; the central axis of the arc structure coincides with the central axis of the clutch gear, and the inner diameter of the arc structure is smaller than the outer diameter of the annular protrusion.

[0009] As an optional embodiment, there are two clutch members, which are axially spaced and located on both sides of the rotating member respectively; the spring element includes two arc-shaped connecting legs; the two arc-shaped connecting legs cross and extend in the middle, and the arc-shaped connecting leg on one axial side drives the clutch member on the other axial side.

[0010] As an optional embodiment, the spring element is a torsion spring; the line connecting the rotation center of the torsion spring and the rotation center of the rotating part is the reference line; when the clutch part is engaged with the drive shaft, the angle between the projection of the free end on the rotation plane of the rotating part and the line connecting the rotation center of the torsion spring and the reference line is less than 60°.

[0011] As an optional embodiment, the protrusion has an arc-shaped guide surface; when the rotating member drives the protrusion to rotate, the abutment portion of the arc-shaped connecting leg can move along the arc-shaped guide surface and gradually move away from the rotation center of the rotating member.

[0012] As an optional embodiment, the protrusion is provided with ribs, which form limiting grooves that open toward the arc-shaped connecting leg and are arranged circumferentially around the rotating part; the arc-shaped connecting leg is clamped in the limiting groove to form a force that prevents the arc-shaped connecting leg from moving along the axis of the rotating part.

[0013] As an optional embodiment, a socket is provided at the bottom of the U-shaped fork; and a hook is provided at the free end for inserting into the socket.

[0014] On the other hand, an embodiment of the present application provides an electric tool, including a shell and the above-mentioned clutch mechanism; a drive module is provided in the shell, and the drive module is used to provide power to the drive shaft of the clutch mechanism; a mode adjustment knob is provided on the outside of the shell, and the mode adjustment knob is used to control the rotating part of the clutch mechanism.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The present invention provides a clutch mechanism comprising a spring element and a rotating member. The rotating member comprises a radially extending protrusion, and the spring element comprises an arcuate connecting leg disposed circumferentially around the rotating member. The present invention also comprises a drive shaft and a clutch member axially movable along the drive shaft. The rotating member is driven to rotate, causing the protrusion to abut against the arcuate connecting leg, pushing the abutment portion of the arcuate connecting leg away from the center of the rotating member. The free end of the arcuate connecting leg pulls the clutch member axially along the drive shaft, thereby engaging or disengaging the clutch member from the drive shaft. The rotating member is driven to rotate in the opposite direction, and the free end, under the action of an elastic force, pushes the clutch member in the opposite direction along the drive shaft, thereby engaging or disengaging the clutch member from the drive shaft. Compared to the prior art, the clutch mechanism provided by the present invention utilizes fewer components, eliminating the need to press-fit a large number of spring elements onto the drive shaft, significantly reducing the assembly complexity of the drive shaft. By optimizing the clutch structure, the present invention ensures the stability of the power tool's shifting operation and improves the tool's maintainability.

[0017] An embodiment of the present application provides an electric tool comprising a housing and the clutch mechanism described above; a drive module is provided within the housing, the drive module being used to provide power to the drive shaft of the clutch mechanism; a mode adjustment knob is provided on the outside of the housing, the mode adjustment knob being used to control the rotating member of the clutch mechanism. The spring element and rotating member of the embodiment of the present application can be mounted on the housing, avoiding the integration of a large number of components on the drive shaft, effectively reducing the assembly complexity of the drive shaft. The electric tool provided by the embodiment of the present application has strong structural stability, which can reduce the failure rate during the use of the tool. In addition, since the clutch mechanism has fewer components, it is also convenient for disassembly, assembly, repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is one of the structural diagrams of the clutch mechanism of the embodiment of the present application;

[0020] Figure 2 This is the second structural diagram of the clutch mechanism of the embodiment of the present application;

[0021] Figure 3 This is the third structural diagram of the clutch mechanism of the embodiment of the present application;

[0022] Figure 4 This is a schematic structural diagram of the electric tool according to an embodiment of the present application;

[0023] Figure 5 This is the fourth structural diagram of the clutch mechanism of the embodiment of the present application.

[0024] Icons: 100-spring element; 101-rotating part; 102-protrusion; 103-arc-shaped connecting leg; 104-driving shaft; 105-clutch part; 106-free end; 107-guide shaft; 108-U-shaped fork; 109-clamping part; 110-arc-shaped structure; 111-reference line; 112-arc-shaped guide surface; 113-rib; 114-socket; 115-hook; 116-housing; 117-mode adjustment knob; 118-output head; 119-start switch; 120-engaging teeth; 121-limiting groove; 122-mode mark. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," "third," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0028] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] Power tools usually require a clutch shift mechanism to quickly switch between different modes during work, so as to meet the different work needs of the staff. Among them, the functional gear switching of the electric hammer is achieved by moving the position of the clutch gear to switch between the drill and hammer functions. In the existing clutch shift mechanism, a large number of springs are pressed and fixed on the drive shaft, making the overall structure relatively bloated. Structural jams and other faults are prone to occur during gear shifting, resulting in the gear shifting operation not being smooth. In severe cases, it will cause gear shifting failure, resulting in abnormal function switching of the power tool. In addition, due to the complex structure and assembly of the existing technology, the maintenance process is also more troublesome.

[0030] In order to solve the above technical problems, the embodiments of the present application provide a clutch mechanism and an electric tool.

[0031] Reference Figure 1 、 Figure 2 As shown, the clutch mechanism provided in the embodiment of the present application includes a spring element 100 , a rotating member 101 , a drive shaft 104 , and a clutch member 105 that can move axially along the drive shaft 104 .

[0032] The rotating member 101 of the embodiment of the present application has a radially extending protrusion 102. The rotating shaft of the rotating member 101 can be mounted on a housing of a power tool.

[0033] The spring element 100 of the present embodiment includes an arcuate connecting leg 103 disposed circumferentially around a rotating member 101. The arcuate connecting leg 103 has a free end 106 that is coupled to a clutch member 105. When the free end 106 moves, it drives the clutch member 105 to move axially along the drive shaft 104.

[0034] In the embodiment of the present application, the drive shaft 104 is provided with meshing teeth 120, and the clutch member 105 can approach the meshing teeth 120 along the axial direction of the drive shaft 104, thereby enabling meshing linkage between the clutch member 105 and the meshing teeth 120. The clutch member 105 can also move away from the meshing teeth 120 along the axial direction of the drive shaft 104, thereby enabling separation of the clutch member 105 from the meshing teeth 120.

[0035] The specific motion process of the embodiment of this application is as follows:

[0036] The rotating member 101 of the embodiment of the present application is driven to rotate, causing the protrusion 102 to abut against the arc-shaped connecting leg 103, and pushing the abutment portion of the arc-shaped connecting leg 103 away from the center of the rotating member 101. The free end 106 of the arc-shaped connecting leg 103 pulls the clutch member 105 to move axially along the drive shaft 104, so that the clutch member 105 is linked or separated with the meshing teeth 120 on the drive shaft 104; the rotating member 101 is driven to rotate in the opposite direction, and the free end 106 pushes the clutch member 105 to move in the opposite direction along the axial direction of the drive shaft 104 under the action of elastic force, so that the clutch member 105 is separated or linked with the meshing teeth 120 of the drive shaft 104.

[0037] Compared with the prior art, the embodiments of the present application have the following advantages:

[0038] First, the present embodiment utilizes a spring element 100 with curved connecting legs 103, replacing a conventional assembly of multiple springs. These curved connecting legs 103 are arranged circumferentially around the rotating member 101 and engage the clutch member 105 via their free ends 106. This design significantly reduces the number and complexity of springs, making the entire clutch mechanism more compact and reducing the overall size and weight of the power tool.

[0039] Secondly, the arcuate connecting leg 103 of the embodiment of the present application extends circumferentially around the rotating member 101. During rotation, the rotating member 101 can smoothly push the arcuate connecting leg 103, making the axial movement of the clutch member 105 smoother. The design of the embodiment of the present application ensures more precise and smooth engagement and disengagement between the clutch member 105 and the meshing teeth 120, avoiding the occurrence of jamming. Furthermore, during reverse rotation, the free end 106 of the arcuate connecting leg 103 can quickly return to its original position under the action of elastic force, further ensuring smooth gear shifting.

[0040] Third, the curved connecting leg 103 in this embodiment of the present application has high elasticity and responsiveness, enabling rapid axial movement of the clutch member 105 at the instant the rotating member 101 rotates. This design of this embodiment of the present application enables faster shifting, enabling quick switching between drill and hammer functions, meeting user needs in different operating scenarios.

[0041] Fourthly, the present embodiment simplifies the structure, reducing the number of parts, lowering assembly difficulty and the probability of failure. The curved connecting leg 103 design not only provides reliable elastic support but also exhibits excellent wear resistance and fatigue resistance, effectively extending the service life of the clutch mechanism. Furthermore, the simplified structure makes maintenance and repair easier, reducing repair costs.

[0042] Further, refer to Figure 2As shown, the clutch mechanism provided in the embodiment of the present application further includes a guide shaft 107. The axis of the guide shaft 107 in the embodiment of the present application is parallel to the axis of the drive shaft 104.

[0043] The guide shaft 107 of the present embodiment is provided with a U-shaped fork 108 connected to the free end 106; the clutch 105 has a clamping portion 109 inserted into the opening of the U-shaped fork 108. The free end 106 drives the clutch 105 to move axially along the drive shaft 104 through the U-shaped fork 108.

[0044] The specific motion process of the embodiment of this application is as follows:

[0045] In the embodiment of the present application, the rotating member 101 is driven to rotate, causing the protrusion 102 to abut against the arcuate connecting leg 103, pushing the abutting portion of the arcuate connecting leg 103 away from the center of the rotating member 101. The free end 106 of the arcuate connecting leg 103 pulls the U-shaped shift fork 108 to move axially along the guide shaft 107. Since the engaging portion 109 on the clutch member 105 is inserted into the U-shaped shift fork 108, the U-shaped shift fork 108 synchronously drives the clutch member 105 to move axially along the drive shaft 104, thereby causing the clutch member 105 to engage or disengage with the meshing teeth 120 on the drive shaft 104.

[0046] Similarly, the rotating member 101 is driven to rotate in the opposite direction, and the free end 106 pushes the U-shaped fork 108 under the action of the elastic force. The U-shaped fork 108 synchronously drives the clutch member 105 to move in the opposite direction along the axial direction of the drive shaft 104, so that the clutch member 105 is separated from or linked with the meshing teeth 120 of the drive shaft 104.

[0047] It should be noted that, in the embodiment of the present application, the movement of the U-shaped fork 108 and the clutch 105 is restricted to the axial direction of the drive shaft 104 by means of the guide shaft 107 and the U-shaped fork 108, ensuring linear movement. The U-shaped fork 108 cooperates with the guide shaft 107, so that when the free end 106 of the arc-shaped connecting leg 103 drives the clutch 105 via the U-shaped fork 108, the movement of the clutch 105 is smoother and more linear. This embodiment of the present application effectively prevents the clutch 105 from deflecting or becoming stuck during the gear shifting process, ensuring the stability and accuracy of the gear shifting action and effectively reducing the rate of mechanical failure.

[0048] In the embodiment of the present application, the axis of the guide shaft 107 is parallel to the axis of the drive shaft 104. Therefore, the distance between the guide shaft 107 and the drive shaft 104 is fixed, which enables the clamping portion 109 of the clutch 105 to be firmly embedded in the opening of the U-shaped fork 108, avoiding the risk of the clutch 105 loosening or falling off during movement.

[0049] Reference Figure 2As shown, as an optional embodiment, the clutch member 105 is a clutch gear sleeved on the drive shaft 104; the clamping portion 109 is an annular protrusion arranged on the circumference of the clutch gear; the annular protrusion is radially inserted into the opening of the U-shaped fork 108, and the annular protrusion contacts the inner walls on both sides of the U-shaped fork 108.

[0050] It should be noted that the clutch member 105 of the embodiment of the present application is a clutch gear sleeved on the drive shaft 104. The clutch gear can use the drive shaft 104 as a guide structure and move along the axial direction of the drive shaft 104. It should be noted that "clutch gear" does not necessarily mean that the clutch member 105 is in the shape of a gear. "Clutch gear" means that the clutch member 105 has a tooth portion that can match the meshing teeth 120 on the drive shaft 104. When the tooth portion of the clutch member 105 engages with the meshing teeth 120 on the drive shaft 104, the clutch member 105 and the drive shaft 104 are linked; when the tooth portion of the clutch member 105 disengages from the meshing teeth 120 on the drive shaft 104, the clutch member 105 is separated from the drive shaft 104. The teeth are distributed along the circumference. Similarly, the meshing teeth 120 are also distributed along the circumference. In this way, when the clutch 105 moves axially, even if the clutch 105 and / or the drive shaft 104 rotate, the teeth of the clutch 105 can still easily engage with the meshing teeth 120 on the drive shaft 104.

[0051] When taking specific actions:

[0052] In the embodiment of the present application, the rotating member 101 is driven to rotate, causing the protrusion 102 to abut against the arc-shaped connecting leg 103, and pushing the abutting portion of the arc-shaped connecting leg 103 away from the center of the rotating member 101. The free end 106 of the arc-shaped connecting leg 103 pulls the U-shaped shift fork 108 to move axially along the guide shaft 107. Because the U-shaped shift fork 108 is engaged with the annular protrusion, the U-shaped shift fork 108 synchronously drives the clutch gear to move axially on the drive shaft 104, so that the clutch gear engages or disengages with the meshing teeth 120 on the drive shaft 104, achieving linkage or separation.

[0053] Similarly, the rotating member 101 is driven to rotate in the opposite direction, and the free end 106 pushes the U-shaped fork 108 under the action of the elastic force. The U-shaped fork 108 synchronously drives the clutch gear to move in the opposite direction along the axial direction on the drive shaft 104, so that the clutch gear is separated from or linked with the meshing teeth 120 of the drive shaft 104.

[0054] In the embodiment of the present application, the clutch member 105 is designed to be a clutch gear sleeved on the drive shaft 104. The embodiment of the present application can ensure that the clutch gear maintains a stable radial posture when moving axially along the drive shaft 104, thereby preventing the clutch gear from shifting or tilting during the gear shifting process. Therefore, the embodiment of the present application can improve the stability of the clutch gear during axial movement, achieve precise linear movement, and facilitate precise matching. In addition, the clutch gear is sleeved on the drive shaft 104, and the drive shaft 104 is a smooth rod, which makes the movement of the clutch gear smoother and reduces frictional resistance, thereby further improving the smoothness and response speed of the gear shifting. Users can experience a smoother gear shifting experience during operation, especially when frequently switching functions, the gear shifting action is faster and more accurate.

[0055] In this embodiment, an annular protrusion is provided around the clutch gear, ensuring close contact with the inner walls of the U-shaped shift fork 108. This large contact surface between the annular protrusion and the U-shaped shift fork 108 provides better guidance and support, further enhancing the stability and precision of shifting. This larger contact surface reduces the risk of the clutch gear loosening or falling off during shifting, improving overall system reliability and reducing the risk of structural failure.

[0056] Reference Figure 2 As shown, as an optional embodiment, arc structures 110 are provided at both ends of the U-shaped fork 108; the central axis of the arc structure 110 coincides with the central axis of the clutch gear, and the inner diameter of the arc structure 110 is smaller than the outer diameter of the annular protrusion.

[0057] In the embodiment of the present application, arc structures 110 are provided at both ends of the U-shaped shift fork 108 so that both ends of the U-shaped shift fork 108 can be as close as possible to the circumferential side surface of the clutch gear.

[0058] It should be noted that the embodiment of the present application can increase the depth of the annular protrusion inserted into the opening of the U-shaped fork 108 through the above-mentioned setting, so that the U-shaped fork 108 and the clutch gear can produce a larger contact surface, ensuring the reliability of the synchronous action of the clutch gear and the U-shaped fork 108.

[0059] Reference Figure 1 、 Figure 2 As shown, as an optional embodiment, there are two clutch members 105, which are axially spaced and located on both sides of the rotating member 101; the spring element 100 includes two arc-shaped connecting legs 103; the two arc-shaped connecting legs 103 cross and extend in the middle, and the arc-shaped connecting leg 103 on one axial side drives the shaft 104 to the clutch member 105 on the other side.

[0060] The embodiment of the present application includes two clutch members 105, which are arranged on both sides of the rotating member 101. It should be noted that the structures of the two clutch members 105 do not necessarily need to be exactly the same, which only means that the two clutch members 105 have the same clutch function with the drive shaft 104, that is, both clutch members 105 can be connected to or separated from the drive shaft 104.

[0061] The spring element 100 of the embodiment of the present application includes two arcuate connecting legs 103, which extend crosswise. The free end 106 of the first arcuate connecting leg 103 is linked to the first clutch member 105, and the free end 106 of the second arcuate connecting leg 103 is linked to the second clutch member 105. It should be noted that the two arcuate connecting legs 103 are not required to have exactly the same shape and size. They only mean that they are bent and extended. The free end 106 of the arcuate connecting leg 103 that abuts one side of the rotating member 101 extends to the other side of the rotating member 101 and is linked to the clutch member 105 on that side. The shape and size of the arcuate connecting leg 103 are determined by the travel required for the corresponding clutch member 105 to achieve clutching.

[0062] The embodiment of the present application has the following three gear modes:

[0063] First, the rotating member 101 of the present embodiment is driven to rotate, causing the protrusion 102 to abut against the first arcuate connecting leg 103, pushing the abutment portion of the first arcuate connecting leg 103 away from the center of the rotating member 101. The free end 106 of the first arcuate connecting leg 103 pulls the clutch member 105 to move axially along the drive shaft 104, thereby causing the first clutch member 105 to engage with the meshing teeth 120 on the drive shaft 104. At the same time, the free end 106 of the second arcuate connecting leg 103, under the action of elastic force, pushes the second clutch member 105 to move in the opposite direction along the axial direction of the drive shaft 104, thereby separating the second clutch member 105 from the meshing teeth 120 on the drive shaft 104.

[0064] Second, in the embodiment of the present application, the rotating member 101 is driven to rotate, causing the protrusion 102 to abut against the second arcuate connecting leg 103, pushing the abutting portion of the second arcuate connecting leg 103 away from the center of the rotating member 101. The free end 106 of the second arcuate connecting leg 103 pulls the second clutch member 105 to move axially along the drive shaft 104, thereby causing the second clutch member 105 to engage with the meshing teeth 120 on the drive shaft 104. At the same time, the free end 106 of the first arcuate connecting leg 103, under the action of elastic force, pushes the first clutch member 105 to move in the opposite direction along the axial direction of the drive shaft 104, thereby separating the first clutch member 105 from the meshing teeth 120 on the drive shaft 104.

[0065] In the third scenario, the protrusion 102 of the rotating member 101 rotates between the two arcuate connecting legs 103, and the protrusion 102 does not push either arcuate connecting leg 103. In this scenario, the first arcuate connecting leg 103 is located on the first side of the rotating member 101. The free end 106 of the first arcuate connecting leg 103, under the action of the elastic return force, drives the first clutch member 105 to move axially along the drive shaft 104, thereby interlocking the first clutch member 105 with the meshing teeth 120 on the drive shaft 104. Simultaneously, the second arcuate connecting leg 103 is located on the second side of the rotating member 101. The free end 106 of the second arcuate connecting leg 103, under the action of the elastic return force, drives the second clutch member 105 to move axially along the drive shaft 104, thereby interlocking the second clutch member 105 with the meshing teeth 120 on the drive shaft 104.

[0066] The embodiment of the present application can enable the power tool to quickly switch between three gears through the above-mentioned settings. For example, in the first gear mode, the power tool can output only rotation, that is, realize the electric drill function. In the second gear mode, the power tool can output only impact, that is, realize the electric hammer function. In the third gear mode, the power tool can output both impact and rotation, that is, realize the hammer drill function. It should be noted that the clutch mechanism provided in the embodiment of the present application provides three switching modes, and those skilled in the art can set the specific mode of the power tool as needed.

[0067] Reference Figure 1 As shown, as an optional embodiment, the spring element 100 is a torsion spring; the line connecting the rotation center of the torsion spring and the rotation center of the rotating member 101 is the reference line 111; when the clutch member 105 is engaged with the drive shaft 104, the angle between the projection of the free end 106 on the rotation plane of the rotating member 101 and the line connecting the rotation center of the torsion spring and the reference line 111 is less than 60°.

[0068] This embodiment of the present application limits the maximum travel of the clutch member 105, ensuring that the angle between the projection of the free end 106 on the rotating plane of the rotating member 101, the line connecting the rotation center of the torsion spring, and the reference line 111 is less than 60°. This ensures that the free end 106 has a more reasonable angle when driving the U-shaped fork 108, reducing unnecessary lateral force. This configuration allows the U-shaped fork 108 to be subjected to a strong push-pull force, thereby enabling the U-shaped fork 108 to reliably drive the clutch member 105.

[0069] In addition, the embodiment of the present application can reduce the wear between the U-shaped fork 108 and the guide shaft 107 through the above-mentioned arrangement, which is conducive to the smooth movement of the U-shaped fork 108 along the guide shaft 107 and can improve the service life of the structural parts to a certain extent.

[0070] Reference Figure 3 As shown, as an optional embodiment, the protrusion 102 has an arc-shaped guide surface 112; when the rotating member 101 drives the protrusion 102 to rotate, the abutment portion of the arc-shaped connecting leg 103 can move along the arc-shaped guide surface 112 and gradually move away from the rotation center of the rotating member 101.

[0071] In the embodiment of the present application, an arcuate guide surface 112 is formed on the protrusion 102. Therefore, the protrusion 102 of the rotating member 101 of the embodiment of the present application can contact the abutment portion of the arcuate connecting leg 103 through the arcuate guide surface 112. When the rotating member 101 is driven, different positions on the arcuate guide surface 112 with different radial distances sequentially abut the abutment portion of the arcuate connecting leg 103, so that the abutment portion of the arcuate connecting leg 103 gradually moves away from the rotation center of the rotating member 101 under the abutment of the arcuate guide surface 112. It should be noted that the number of arcuate guide surfaces 112 corresponds to the number of arcuate connecting legs 103. The two arcuate guide surfaces 112 are sequentially distributed along the axial direction of the rotating member 101 and respectively cooperate with the two arcuate connecting legs 103. The shape and size of the two arcuate guide surfaces 112 do not necessarily need to be the same, and are specifically determined by the clutch stroke of the corresponding clutch member 105.

[0072] The above-mentioned arrangement in the embodiment of the present application can make the pushing process of the rotating member 101 on the arc-shaped connecting leg 103 smoother, which is conducive to improving the fluency of the movement.

[0073] Reference Figure 3 As shown, as an optional embodiment, the protrusion is provided with ribs 113, which form limiting grooves 121 that open toward the arcuate connecting leg 103 and are arranged circumferentially around the rotating member 101. The arcuate connecting leg 103 is retained within the limiting grooves 121, generating a force that prevents the arcuate connecting leg 103 from moving along the axis of the rotating member 101. The ribs 113 are located on one or both sides of the arcuate guide surface 112 in the axial direction of the rotating member 101. The arcuate guide surface 112 forms the bottom surface of the limiting grooves 121.

[0074] In this embodiment of the present application, ribs 113 are provided on the protrusion, and ribs 113 form retaining grooves 121. In this embodiment of the present application, the arcuate connecting leg 103 is retained in the retaining grooves 121. When the rotating member 101 is driven to rotate, the protrusion 102 abuts against the arcuate connecting leg 103, and the retaining grooves 121 generate a force that blocks the arcuate connecting leg 103 from moving along the axis of the rotating member 101.

[0075] The embodiment of the present application can prevent the arc-shaped connecting leg 103 and the protrusion 102 from detaching during the rotation process through the limiting groove 121, ensuring that the arc-shaped connecting leg 103 can reliably abut against the protrusion, which is beneficial to improving the reliability of the structure and reducing the failure rate.

[0076] Reference Figure 1 As shown, as an optional embodiment, a socket 114 is provided at the bottom of the U-shaped fork 108 ; and a hook 115 is provided at the free end 106 and inserted into the socket 114 .

[0077] The embodiment of the present application provides a socket 114 at the bottom of the U-shaped fork 108, so that the hook 115 of the free end 106 can be reliably connected to the U-shaped fork 108. The connection structure of the embodiment of the present application is simple, not only easy to prepare, but also can achieve quick disassembly and assembly.

[0078] Reference Figure 4 、 Figure 5 As shown, the electric tool provided in the embodiment of the present application includes a shell 116 and the above-mentioned clutch mechanism; a drive module is provided in the shell 116, and the drive module is used to provide power to the drive shaft 104 of the clutch mechanism; a mode adjustment knob 117 is provided on the outside of the shell 116; the mode adjustment knob 117 is used to control the rotating part 101 of the clutch mechanism.

[0079] Reference Figure 4 As shown, the outer wall of the housing 116 of the present embodiment is provided with a plurality of mode markings 122 arranged circumferentially around the mode adjustment knob 117. These markings include hammer, drill, and hammer-drill combination modes. A worker can rotate the mode adjustment knob 117 as needed, which in turn drives the rotating member 101 of the clutch mechanism to rotate, thereby switching the clutch mechanism's operation.

[0080] The housing 116 of the present embodiment is provided with an output head 118 and a start switch 119. Rotating the mode adjustment knob 117 to a different mode mark 122 adjusts the power tool to the corresponding output mode. Then, turning on the start switch 119 causes the drive module to drive the output head 118 via the drive shaft 104 to operate.

[0081] The spring element 100 and rotating member 101 of the present embodiment can be mounted on the housing 116, eliminating the need for numerous components on the drive shaft 104 and effectively reducing the assembly complexity of the drive shaft 104. The present embodiment provides a power tool with enhanced structural stability, reducing the likelihood of tool failure during use. Furthermore, since the clutch mechanism has fewer components, it is also easier to disassemble, repair, and maintain.

[0082] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A clutch mechanism, characterized in that: The invention comprises a spring element and a rotating member; the rotating member has a protrusion extending radially; the spring element comprises an arc-shaped connecting leg arranged around the circumference of the rotating member; the invention also comprises a drive shaft and a clutch member movable axially along the drive shaft; the rotating member is driven to rotate, so that the protrusion abuts against the arc-shaped connecting leg and pushes the abutting portion of the arc-shaped connecting leg away from the center of the rotating member, and the free end of the arc-shaped connecting leg pulls the clutch member to move axially along the drive shaft, so that the clutch member is linked to or separated from the drive shaft; the rotating member is driven to rotate in the opposite direction, and the free end pushes the clutch member to move in the opposite direction along the axial direction of the drive shaft under the action of elastic force, so that the clutch member is separated from or linked to the drive shaft.

2. The clutch mechanism according to claim 1, characterized in that: It also includes a guide shaft; the axis of the guide shaft is parallel to the axis of the drive shaft; the guide shaft is provided with a U-shaped fork connected to the free end; the clutch member has a clamping portion inserted into the opening of the U-shaped fork, and the free end drives the clutch member to move axially along the drive shaft through the U-shaped fork.

3. The clutch mechanism according to claim 2, characterized in that: The clutch member is a clutch gear sleeved on the drive shaft; the clamping portion is an annular protrusion arranged circumferentially on the clutch gear; the annular protrusion is radially inserted into the opening of the U-shaped fork, and the annular protrusion contacts the inner walls on both sides of the U-shaped fork.

4. The clutch mechanism according to claim 3, characterized in that: Arc structures are provided at both ends of the U-shaped shift fork; the central axis of the arc structure coincides with the central axis of the clutch gear, and the inner diameter of the arc structure is smaller than the outer diameter of the annular protrusion.

5. The clutch mechanism according to any one of claims 1 to 4, characterized in that: There are two clutch parts, which are axially spaced and located on both sides of the rotating part respectively; the spring element includes two arc-shaped connecting legs; the two arc-shaped connecting legs cross and extend in the middle, and the arc-shaped connecting leg on one axial side drives the clutch part on the other axial side.

6. The clutch mechanism according to any one of claims 1 to 4, characterized in that: The spring element is a torsion spring; the line connecting the rotation center of the torsion spring and the rotation center of the rotating part is a reference line; when the clutch part is engaged with the drive shaft, the angle between the projection of the free end on the rotation plane of the rotating part and the line connecting the rotation center of the torsion spring and the reference line is less than 60°.

7. The clutch mechanism according to any one of claims 1 to 4, characterized in that: The protruding portion is provided with an arc-shaped guiding surface; when the rotating member drives the protruding portion to rotate, the abutting portion of the arc-shaped connecting leg can move along the arc-shaped guiding surface and gradually move away from the rotation center of the rotating member.

8. The clutch mechanism according to any one of claims 1 to 4, characterized in that: The protruding portion is provided with ribs, which form limiting grooves with openings toward the arc-shaped connecting leg and arranged circumferentially around the rotating member; the arc-shaped connecting leg is clamped in the limiting groove to form a force that blocks the arc-shaped connecting leg from moving along the axis of the rotating member.

9. The clutch mechanism according to any one of claims 2 to 4, characterized in that: A socket is provided at the bottom of the U-shaped fork; and a hook is provided at the free end which is inserted into the socket.

10. An electric tool, characterized in that: It comprises a shell and the clutch mechanism described in any one of claims 1 to 9; a drive module is provided in the shell, and the drive module is used to provide power to the drive shaft of the clutch mechanism; a mode adjustment knob is provided outside the shell, and the mode adjustment knob is used to control the rotating part of the clutch mechanism.

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