Torque limiter

Abstract

The utility model discloses a torque limiter, which comprises a first transmission component, a second transmission part, a clutch part and an elastic part, wherein the second transmission part is partially inserted into the first transmission component and is coaxial with the first transmission component; the clutch part is arranged between the first transmission component and the second transmission part; the elastic part is arranged between the clutch part and the first transmission part; a plurality of matched anti-rotation slipping structures arranged in the circumferential direction are further arranged between the clutch piece and the first transmission assembly. When the torque borne by the first transmission assembly exceeds a threshold value, the elastic piece is compressed and deformed, the rotation stopping and slipping structures are in mutual slipping fit so that the clutch piece can move in the axial direction, the first transmission assembly idles, and the clutch piece and the second transmission piece do not rotate. And when the torque borne by the first transmission assembly is reduced to be within the threshold value range, the elastic piece is reset, the rotation stopping and slipping structure relieves mutual slipping so that the clutch piece can move in the axial direction, and the first transmission assembly drives the clutch piece and the second transmission piece to rotate synchronously. According to the utility model, the comprehensive use performance can be optimized.

Description

Technical Field

[0001] The utility model relates to the field of mechanical transmission, in particular to a torque limiter. Background Art

[0002] Usually, smart appliances such as the flip mechanism of smart toilets and the door opening mechanism of dishwashers are equipped with torque limiters. The torque limiter is mainly used to transmit torque. Usually, the torque limiter is installed between the driving shaft and the driven shaft. When the load connected to the driven shaft exceeds the threshold or fails, the torque required by the driven shaft exceeds the set value. At this time, the torque limiter limits the torque transmitted by the transmission system in the form of slippage, which is specifically manifested as the driving shaft idling and the driven shaft stopping, thereby playing the role of overload protection. When the torque drops to within the threshold range, the slippage phenomenon will also stop, and the product will resume normal operation.

[0003] In this regard, the torque limiters used in the prior art are varied. For example, the ratchet-type torque limiter disclosed in the announcement number CN218325892U uses a ratchet member that rotates rapidly counterclockwise relative to the ratchet wheel, and the movable end of the ratchet member is easily damaged by the arch. For another example, in the technical solution disclosed in the announcement number CN211875036 U, the torsion spring used to hold the cylindrical member improves the anti-fatigue performance, but the method of controlling the clamping force instead of the torque makes it difficult to control the force accuracy. For another example, in the technical solution disclosed in the announcement number CN107524726A, the second transmission member will have axial movement when slipping, accelerating the wear of its tooth surface. In addition, the first connecting member is a stepped shaft, which is much more expensive than the optical shaft and has poor economic efficiency. In addition, the relative rotation between the second transmission member and the first connecting member in this technical solution will cause the elastic member to be twisted and deformed, and then cause its axial elastic force to change, resulting in the problem of poor slip torque accuracy.

[0004] In summary, in view of the problems existing in the use of various torque limiters in the prior art, from the perspective of optimizing their comprehensive performance, their structures need to be further optimized and improved. Utility Model Content

[0005] The utility model aims to provide a torque limiter to solve the technical problem of optimizing its comprehensive performance.

[0006] The torque limiter of the utility model is realized in this way:

[0007] A torque limiter comprises: a first transmission assembly, a second transmission member partially inserted into the first transmission assembly and arranged coaxially with the first transmission assembly, a clutch member arranged between the first transmission assembly and the second transmission member, and an elastic member arranged between the clutch member and the first transmission member assembly; wherein

[0008] The clutch member and the second transmission member are limitedly matched along the circumferential direction, and there is axial relative movement between the clutch member and the second transmission member;

[0009] A plurality of anti-rotation and anti-slip structures arranged along the circumferential direction are also provided between the clutch member and the first transmission assembly;

[0010] When the torque applied to the first transmission component exceeds a threshold value, the elastic member is compressed and deformed, the anti-rotation slipping structures are mutually slipped and matched to make the clutch member move axially, the first transmission component idles, and the clutch member and the second transmission member do not rotate;

[0011] When the torque applied to the first transmission component drops to a threshold range, the elastic member is reset, the anti-slip structures release mutual slippage to allow the clutch member to move axially, and the first transmission component drives the clutch member and the second transmission member to rotate synchronously.

[0012] In an optional implementation of the utility model, the anti-rotation and slipping structure includes a first anti-rotation and slipping group provided on the first transmission component and a second anti-rotation and slipping group provided on the clutch member;

[0013] The first anti-rotation slip group includes an anti-rotation surface and a pair of guide inclined surfaces respectively arranged at two side ends of the anti-rotation surface along the circumferential direction of the first transmission component; a positioning groove is formed between each two adjacent first anti-rotation slip groups;

[0014] The second anti-rotation slip group includes a slip surface and a pair of matching inclined surfaces respectively arranged at two side ends of the slip surface along the circumferential direction of the clutch member; each of the slip surfaces is formed on a convex tooth convexly arranged on the side end of the clutch member facing the first anti-rotation slip group;

[0015] Each of the protruding teeth is suitable for being inserted into the positioning groove so that the first transmission component drives the clutch member and the second transmission member to rotate synchronously.

[0016] In an optional implementation of the present invention, the anti-rotation surface is a flat end surface perpendicular to the axial direction of the first anti-rotation slip group, and the slip surface is a flat end surface perpendicular to the axial direction of the clutch member; and

[0017] A pair of guide inclined surfaces are symmetrically distributed relative to the axial direction of the first anti-rotation sliding group;

[0018] A pair of matching inclined surfaces are symmetrically distributed relative to the axial direction of the clutch member.

[0019] In an optional implementation of the utility model, the anti-rotation surface and the pair of guide inclined surfaces are in smooth transition; the slip surface and the pair of matching inclined surfaces are in smooth transition; and

[0020] The first anti-rotation sliding group is a helical surface, and the helix angle of the anti-rotation surface is zero, while the helix angle of the pair of guiding inclined surfaces is a positive value;

[0021] The second anti-rotation slip group is a helical surface, and the helix angle of the slip surface is zero, while the helix angle of a pair of matching inclined surfaces is a positive value.

[0022] In an optional implementation of the present invention, the first transmission component and the second transmission member are limitedly matched along the axial direction, and the first transmission component is suitable for relative movement with the second transmission member in the circumferential direction;

[0023] The first transmission assembly includes a first transmission member and a limiting member connected to the first transmission member;

[0024] The limiting member is formed with a receiving cavity for accommodating part of the second transmission member;

[0025] The clutch component is located in the receiving cavity, and the anti-rotation and slipping structure is formed between the clutch component and the first transmission component.

[0026] In an optional implementation of the present invention, the limiting member is fixedly connected to the first transmission member or is integrally formed therewith.

[0027] In an optional implementation of the utility model, the first transmission member includes an annular body connected to the limiting member and a matching portion provided at one axial end of the annular body;

[0028] The anti-rotation and slipping structure is formed between the clutch component and the matching portion.

[0029] In an optional implementation of the utility model, an L-shaped axial limiting surface is provided in the receiving cavity; and

[0030] The second transmission member is provided with an L-shaped positioning surface suitable for axially abutting with the L-shaped axial limiting surface.

[0031] In an optional implementation of the present invention, at least one plug-in fitting structure is provided between the clutch member and the first transmission member for forming a limited fit between the two in a circumferential direction.

[0032] In an optional implementation of the present invention, the elastic member is a metal compression spring.

[0033] In an optional implementation of the present invention, the elastic member is provided with two magnetic members used in conjunction with each other; and

[0034] Each magnetic member is an axially magnetized structure, and the polarities of the opposite end surfaces of the two magnetic members are the same.

[0035] By adopting the above technical scheme, the utility model has the following beneficial effects: the torque limiter of the utility model, firstly, realizes the slipping cooperation with the first transmission component through the clutch component, and in the process of relative slipping of the clutch component and the first transmission component, the clutch component realizes the switching of the cooperation state with the first transmission component through its axial movement, and the clutch component itself does not need to be deformed, thereby avoiding the problem of damage of the clutch component or the second transmission component due to deformation.

[0036] Furthermore, the anti-rotation surface is a flat end surface perpendicular to the axial direction of the first anti-rotation sliding group, and the sliding surface is a flat end surface perpendicular to the axial direction of the clutch. This structure can reduce the stress generated when the clutch and the first transmission component are in a sliding fit, thereby reducing the deformation and wear of the anti-rotation sliding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the torque limiter of the utility model;

[0038] Figure 2 It is a schematic diagram of the exploded structure of the torque limiter of the utility model;

[0039] Figure 3 It is a structural schematic diagram of the clutch member and the first transmission member of the torque limiter of the utility model when the slipping state is released;

[0040] Figure 4 It is a structural schematic diagram of the torque limiter of the utility model when the clutch member and the first transmission member are in a relatively slipping state;

[0041] Figure 5 It is a schematic structural diagram of a first transmission member of the torque limiter of the utility model from a first perspective;

[0042] Figure 6 It is a schematic structural diagram of the first transmission member of the torque limiter of the utility model from a second perspective;

[0043] Figure 7 for Figure 6 A-direction cross-sectional schematic diagram;

[0044] Figure 8 It is a schematic diagram of the internal structure of the first transmission member of the torque limiter of the utility model;

[0045] Fig. 9 It is a schematic diagram of the internal structure of the limiter of the torque limiter of the utility model;

[0046] Fig.10 It is a structural schematic diagram of the clutch component of the torque limiter of the utility model;

[0047] Fig.11It is a structural schematic diagram of the clutch member and the second transmission member of the torque limiter of the utility model when they rotate synchronously with the first transmission member;

[0048] Fig.12 The structure diagram of the clutch member and the second transmission member of the torque limiter of the utility model when they begin to enter the slipping matching state relative to the first transmission member Figure 1 ;

[0049] Fig.13 The structure diagram of the clutch member and the second transmission member of the torque limiter of the utility model when they begin to enter the slipping matching state relative to the first transmission member Figure 2 ;

[0050] Fig.14 It is a structural schematic diagram of the clutch member and the second transmission member of the torque limiter of the utility model when they are in relative slip fit with respect to the first transmission member;

[0051] Fig.15 This is a schematic structural diagram of the torque limiter of the utility model when the elastic member adopts a magnetic member.

[0052] In the figure: a first transmission member 1, an annular body 11, a matching portion 12, a stop surface 13, a positioning groove 14, a guide slope 15, a first limiting surface 16, a second transmission member 2, an L-shaped positioning surface 21, a positioning block 22, a guide column 23, a convex tooth 57, a metal compression spring 3, a clutch member 5, a limiting cavity 51, a positioning groove 52, a limiting column 53, a sliding surface 54, an adapting slope 55, a second limiting surface 56, a connecting shaft 6, a limiting member 7, a receiving cavity 71, an L-shaped axial limiting surface 72, and a magnetic member 8. DETAILED DESCRIPTION

[0053] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0054] Embodiment 1:

[0055] See also Figures 1 to 14 As shown, this embodiment provides a torque limiter, including: a first transmission assembly, a second transmission member 2 partially inserted into the first transmission assembly and coaxially arranged with the first transmission assembly, a clutch member 5 arranged between the first transmission assembly and the second transmission member 2, and an elastic member arranged between the clutch member 5 and the first transmission member assembly.

[0056] The first transmission assembly is used to cooperate with an external driving mechanism or an external actuator, and both the first transmission assembly and the second transmission member 2 have toothed structures. A connecting shaft 6 runs through the first transmission assembly and the second transmission assembly, and the connecting shaft 6 also runs through the clutch member 5 and the elastic member. The connecting shaft 6 here is an optical axis, which has low cost and good economy.

[0057] Based on this structure, roughly speaking, the clutch 5 and the second transmission member 2 are limited in the circumferential direction, and there is axial relative movement between the clutch 5 and the second transmission member 2; the first transmission assembly and the second transmission member 2 are limited in the axial direction, and the first transmission assembly is suitable for relative movement with the second transmission member 2 in the circumferential direction. In addition, a plurality of anti-slip structures arranged along the circumferential direction are also provided between the clutch 5 and the first transmission assembly. The drawings of this embodiment only take the case of designing three anti-slip structures as an example, but it is not an absolute limitation, and the three anti-slip structures here are preferably structures evenly distributed along the circumferential direction of the clutch 5.

[0058] When the torque applied to the first transmission component exceeds a threshold value, the elastic part is compressed and deformed, and the anti-rotation slipping structures slip against each other to make the clutch 5 move axially (at this time, the clutch 5 moves toward the side of the second transmission component 2), and the first transmission component idles while the clutch 5 and the second transmission component 2 do not rotate; when the torque applied to the first transmission component drops to within the threshold range, the elastic part is reset, and the anti-rotation slipping structures stop slipping against each other to make the clutch 5 move axially (at this time, the clutch 5 moves toward the side away from the second transmission component 2), and the first transmission component drives the clutch 5 and the second transmission component 2 to rotate synchronously.

[0059] In order to achieve the above effects, this embodiment takes an optional situation as an example with reference to the accompanying drawings:

[0060] First, the first transmission assembly includes a first transmission member 1 and a stopper 7 connected to the first transmission member 1; a receiving cavity 71 for accommodating part of the second transmission member 2 is formed in the stopper 7; the clutch member 5 is located in the receiving cavity 71, and the anti-slip structure is formed between the clutch member 5 and the first transmission member 1. The stopper 7 is fixedly connected to the first transmission member 1 or integrally formed.

[0061] On the basis of the above structure, in order to make the first transmission assembly and the second transmission member 2 cooperate in axial limiting, an L-shaped axial limiting surface 72 is provided in the receiving cavity 71; and an L-shaped positioning surface 21 suitable for axially abutting with the L-shaped axial limiting surface 72 is provided on the second transmission member 2. Here, the limiting of one axial side direction of the second transmission member 2 is achieved by the abutment of the L-shaped positioning surface 21 and the L-shaped axial limiting surface 72, while the limiting of the other axial side direction of the second transmission member 2 is achieved by the elastic action of the elastic member.

[0062] Secondly, the first transmission member 1 includes an annular body 11 connected to the limiting member 7 and a matching portion 12 provided at one axial end of the annular body 11; the matching portion 12 is used to form a support for the shaft side end of the clutch member 5 facing away from the second transmission member 2, and the anti-slip structure is formed between the clutch member 5 and the matching portion 12. The matching portion 12 here is located on one side end of the annular body 11 away from the L-shaped axial limiting surface 72, so that the matching portion 12 and the clutch member 5 can achieve the limitation of the shaft side end of the second transmission member 2 facing away from the L-shaped axial limiting surface 72 through the transition of the elastic member on the basis of axial matching, thereby achieving the axial relative static and non-movement effect between the first transmission member 1 and the second transmission member 2.

[0063] Next, it is explained about the cooperation between the clutch member 5 and the second transmission member 2:

[0064] The clutch 5 has a limiting cavity 51 suitable for partially inserting the first transmission member 1, and at least one plug-in matching structure for forming a limiting match between the clutch 5 and the first transmission member 1 in the circumferential direction is provided between the clutch 5 and the first transmission member 1. The elastic member is located in the limiting cavity 51 to achieve matching with the first transmission member 1.

[0065] In this regard, an optional embodiment is given as an example in conjunction with the accompanying drawings. The plug-in matching structure here includes a positioning block 22 protruding from the second transmission member 2 and a positioning notch 52 provided on the clutch member 5 for inserting the positioning block 22. The positioning notch 52 is preferably a U-shaped groove structure extending along the axial direction of the clutch member 5, so that the second transmission member 2 and the clutch member 5 will not rotate relative to each other through the cooperation of the positioning block 22 and the positioning notch 52. At the same time, when the clutch member 5 moves axially relative to the second transmission member 2, the U-shaped groove moves along the positioning block 22, that is, the cooperation of the positioning block 22 and the U-shaped groove also defines the axial movement trajectory of the clutch member 5.

[0066] Based on the above situation, an elastic member is given as an example, which can be a metal compression spring 3. In this regard, considering that only axial expansion and contraction deformation will occur during the deformation of the metal compression spring 3, and no radial torsion will occur, so as to better exert the elastic effect of the elastic member, the present embodiment also provides a limit column 53 suitable for inserting into the metal compression spring 3 in the limit cavity 51. Similarly, a guide column 23 suitable for inserting into the metal compression spring 3 is provided on the second transmission member 2, and at least when the clutch 5 and the second transmission member 2 are released from the relative slipping state, there is an axial gap between the guide column 23 and the limit column 53, and the axial gap provides a space for the axial movement of the clutch 5. When the clutch 5 and the first transmission member 1 are in a slipping state, there can also be an axial gap between the guide column 23 and the limit column 53, or the guide column 23 and the limit column 53 are in abutment with each other. The metal compression spring 3 has the advantage of strong fatigue resistance, and the pressure of the metal compression spring 3 is easy to accurately control.

[0067] Next, we will explain the anti-slip structure:

[0068] Generally speaking, the anti-rotation and slipping structure comprises a first anti-rotation and slipping group provided on the first transmission component and a second anti-rotation and slipping group provided on the clutch member 5 .

[0069] In more detail, first, the first anti-rotation slip group includes an anti-rotation surface 13 and a pair of guide slopes 15 respectively arranged at two side ends of the anti-rotation surface 13 along the circumferential direction of the first transmission member 1; a positioning groove 14 is formed between each two adjacent first anti-rotation slip groups. The guide slope 15 here refers to the state that it is inclined relative to the axial direction of the first transmission member 1.

[0070] Secondly, the second anti-rotation slip group includes a slip surface 54 and a pair of matching inclined surfaces 55 respectively arranged at two side ends of the slip surface 54 along the circumferential direction of the clutch 5; each slip surface 54 is formed on a convex tooth 57 convexly arranged on the side end of the clutch 5 facing the first anti-rotation slip group; each convex tooth 57 is suitable for being inserted into the positioning groove 14 so that the first transmission assembly drives the clutch 5 and the second transmission member 2 to rotate synchronously. The matching inclined surface 55 here refers to the state that it is inclined relative to the axial direction of the clutch 5.

[0071] On the basis of the above structure, it should be noted that, in a specific optional implementation, the anti-rotation surface 13 is a flat end surface perpendicular to the axial direction of the first anti-rotation slip group, and the slip surface 54 is a flat end surface perpendicular to the axial direction of the clutch 5. Under this structure, the stress generated when the clutch 5 and the first transmission assembly are in slipping cooperation can be reduced, thereby reducing the deformation and wear of the anti-rotation slip structure.

[0072] Furthermore, the pair of guide slopes 15 are symmetrically distributed relative to the axial direction of the first anti-rotation slip group, and the pair of adapting slopes 55 are symmetrically distributed relative to the axial direction of the clutch 5. Under this structure, the slip torque generated when slipping in the forward and reverse directions is equal.

[0073] In addition, the anti-rotation surface 13 and the pair of guide inclined surfaces 15 are in smooth transition; the slip surface 54 and the pair of matching inclined surfaces 55 are in smooth transition; and the first anti-rotation slip group is a helical surface, and the helix angle of the anti-rotation surface 13 is zero, while the helix angle of the pair of guide inclined surfaces 15 is a positive value; the second anti-rotation slip group is a helical surface, and the helix angle of the slip surface 54 is zero, while the helix angle of the pair of matching inclined surfaces 55 is a positive value. In other words, the anti-rotation surface 13 and the pair of guide inclined surfaces 15 are formed by the same generatrix, which is a straight line perpendicularly intersecting the axis of the first transmission member 1. Similarly, the slip surface 54 and the pair of matching inclined surfaces 55 are formed by the same generatrix, which is a straight line perpendicularly intersecting the axis of the clutch 5. Under this structure, when the clutch 5 and the first transmission member 1 are in slipping cooperation, the anti-rotation surface 13 and the slip surface 54 are in close contact with each other to achieve surface contact, thereby reducing stress concentration and thus reducing wear.

[0074] It should also be noted that when the clutch 5 and the first transmission member 1 are released from the slipping state, the annular body 11 on the first transmission member 1 is in contact with the clutch 5, but the anti-rotation surface 13 on the annular body 11 and the slipping surface 54 on the clutch 5 are both in a suspended state. The benefit of this design is to reduce the friction force on the anti-rotation surface 13 and the slipping surface 54, thereby reducing wear. In order to achieve this effect, a first limiting surface 16 for contacting with the clutch 5 is provided on the first transmission member 1, and a second limiting surface 56 for contacting with the first limiting surface 16 is provided on the clutch 5. Specifically, the first limiting surface 16 here is slightly convex relative to the anti-rotation surface 13, and similarly, the second limiting surface 56 is slightly convex relative to the slipping surface 54.

[0075] Finally, it should be noted that, in summary, for the torque limiter of this embodiment, its specific implementation principle is as follows:

[0076] When the torque limiter is subjected to a torque exceeding a threshold value, the clutch 5 is used to achieve slipping cooperation with the first transmission component. In the process of relative slippage between the clutch 5 and the first transmission component, the clutch 5 achieves switching of the cooperation state with the first transmission component through its axial movement without deformation of the clutch 5 itself. Therefore, the problem of damage of the clutch 5 or the second transmission component 2 due to deformation can be avoided.

[0077] When the torque limiter is subjected to a torque within the threshold, the matching inclined surface 55 on the side of the slip surface 54 of the clutch 5 contacts the guiding inclined surface 15 on the side of the anti-rotation surface 13 of the first transmission member 1, and a resistance pressure is generated between the two. The circumferential component of the pressure is used to prevent the clutch 5 from continuing to rotate relative to the first transmission member 1, thereby transmitting the working torque. The axial component of the pressure causes the clutch 5 to move a certain distance in the direction away from the first transmission member 1 along the axial compression elastic member, but does not cause the anti-rotation surface 13 of the first transmission member 1 to conflict with the smooth surface of the clutch 5.

[0078] When the torque applied to the first transmission component exceeds the threshold value, the axial component of the pressure of the first transmission member 1 drives the clutch 5 to compress the elastic member and move axially away from the first transmission member 1, so that the convex tooth 57 of the clutch 5 and the positioning groove 14 of the first transmission member 1 are disengaged from the plug-in mating state to achieve the mutual slipping effect of the clutch 5 and the first transmission member 1. At this time, the anti-rotation surface 13 abuts against the smooth surface, and the resistance pressure generated has only axial force but no circumferential component, and the friction force generated by the axial force is much smaller than the overload torque. The clutch 5 will rotate and slip rapidly relative to the first transmission member 1, thereby cutting off the transmission route of the super-threshold torque and providing overload protection for the transmission mechanism and the actuator.

[0079] Embodiment 2:

[0080] See also Fig.15 As shown, based on the torque limiter of Example 1, the torque limiter provided in this embodiment has the same general structure as that of Example 1, and the difference lies in the elastic member used. Specifically, the elastic member in this embodiment uses two magnetic members 8 used in conjunction with each other; and each magnetic member 8 is an axially magnetized structure, and the polarities of the opposite end faces of the two magnetic members 8 are the same (two S poles or two N poles are opposite), so that the elastic effect of the elastic member of this embodiment is achieved through the characteristic of like poles repelling each other.

[0081] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0082] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0085] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0086] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A torque limiter, characterized in that: include: A first transmission assembly, a second transmission member partially inserted into the first transmission assembly and coaxially arranged with the first transmission assembly, a clutch member disposed between the first transmission assembly and the second transmission member, and an elastic member disposed between the clutch member and the first transmission member assembly; wherein The clutch member and the second transmission member are limitedly matched along the circumferential direction, and there is axial relative movement between the clutch member and the second transmission member; A plurality of anti-rotation and slipping structures arranged along the circumferential direction are also provided between the clutch member and the first transmission assembly; When the torque applied to the first transmission component exceeds a threshold value, the elastic member is compressed and deformed, the anti-rotation slipping structures are mutually slipped and matched to make the clutch member move axially, the first transmission component idles, and the clutch member and the second transmission member do not rotate; When the torque applied to the first transmission component drops to a threshold range, the elastic member is reset, the anti-slip structures release mutual slippage to allow the clutch member to move axially, and the first transmission component drives the clutch member and the second transmission member to rotate synchronously.

2. The torque limiter according to claim 1, characterized in that: The anti-rotation and slipping structure comprises a first anti-rotation and slipping group arranged on the first transmission component and a second anti-rotation and slipping group arranged on the clutch member; The first anti-rotation slip group includes an anti-rotation surface and a pair of guide inclined surfaces respectively arranged at two side ends of the anti-rotation surface along the circumferential direction of the first transmission component; a positioning groove is formed between each two adjacent first anti-rotation slip groups; The second anti-rotation slip group includes a slip surface and a pair of matching inclined surfaces respectively arranged at two side ends of the slip surface along the circumferential direction of the clutch member; each of the slip surfaces is formed on a convex tooth convexly arranged on the side end of the clutch member facing the first anti-rotation slip group; Each of the protruding teeth is suitable for being inserted into the positioning groove so that the first transmission component drives the clutch member and the second transmission member to rotate synchronously.

3. The torque limiter according to claim 2, characterized in that: The anti-rotation surface is a flat end surface perpendicular to the axial direction of the first anti-rotation sliding group, and the sliding surface is a flat end surface perpendicular to the axial direction of the clutch member; and A pair of guide inclined surfaces are symmetrically distributed relative to the axial direction of the first anti-rotation sliding group; A pair of matching inclined surfaces are symmetrically distributed relative to the axial direction of the clutch member.

4. The torque limiter according to claim 3, characterized in that: The anti-rotation surface and the pair of guiding inclined surfaces are in smooth transition; the slipping surface and the pair of matching inclined surfaces are in smooth transition; and The first anti-rotation sliding group is a helical surface, and the helix angle of the anti-rotation surface is zero, while the helix angle of the pair of guiding inclined surfaces is a positive value; The second anti-rotation slip group is a helical surface, and the helix angle of the slip surface is zero, while the helix angle of a pair of matching inclined surfaces is a positive value.

5. The torque limiter according to any one of claims 1 to 4, characterized in that: The first transmission component is limitedly matched with the second transmission member along the axial direction, and the first transmission component is suitable for relative movement with the second transmission member in the circumferential direction; The first transmission assembly includes a first transmission member and a limiting member connected to the first transmission member; The limiting member is formed with a receiving cavity for accommodating part of the second transmission member; The clutch component is located in the receiving cavity, and the anti-rotation and slipping structure is formed between the clutch component and the first transmission component.

6. The torque limiter according to claim 5, characterized in that: The limiting member is fixedly connected to the first transmission member or is integrally formed with the first transmission member.

7. The torque limiter according to claim 5, characterized in that: The first transmission member includes an annular body connected to the limiting member and a matching portion provided at one axial end of the annular body; The anti-rotation and slipping structure is formed between the clutch component and the matching portion.

8. The torque limiter according to claim 5, characterized in that: An L-shaped axial limiting surface is provided in the receiving cavity; and The second transmission member is provided with an L-shaped positioning surface suitable for axially abutting with the L-shaped axial limiting surface.

9. The torque limiter according to any one of claims 1 to 4, characterized in that: At least one plug-in fitting structure is provided between the clutch member and the first transmission member for forming a limited fit between the two in the circumferential direction.

10. The torque limiter according to any one of claims 1 to 4, characterized in that: The elastic member is a metal compression spring.

11. The torque limiter according to any one of claims 1 to 4, characterized in that: The elastic member uses two magnetic members used in conjunction with each other; and Each magnetic member is an axially magnetized structure, and the polarities of the opposite end surfaces of the two magnetic members are the same.

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