Zigzag spring coupling and failure protection structure thereof

Abstract

The embodiment of the invention provides a zigzag spring coupling and a failure protection structure thereof, the failure protection structure comprises a driving shaft section, a driven shaft section and a failure protection assembly, the failure protection assembly comprises at least one pair of concave-convex structures matched with each other, and a circumferential gap is formed between each pair of concave-convex structures during assembly; when a zigzag spring of the zigzag spring coupler loses efficacy, the concave-convex structures abut against each other along with displacement of the driving shaft joint. The failure protection assembly is coaxially arranged between the opposite end faces of the two half couplings, a zigzag spring is replaced, the shaft transmission function is achieved, it is guaranteed that the zigzag spring coupling continues to operate when the zigzag spring fails, and the failure protection function is provided.

Description

Technical Field

[0001] The present application relates to the field of couplings, and in particular to a snake spring coupling and a failure protection structure thereof. Background Art

[0002] The serpentine spring coupling is a high-performance elastic coupling used to transmit torque and absorb vibration. It is suitable for connecting two coaxial medium and large power transmission shaft systems. It has certain performance of compensating the relative offset of the two shafts and reducing vibration and buffering. It is widely used in heavy machinery, wind power generation, rail transportation and other fields where shaft connection and shaft transmission are required.

[0003] In the related art, the serpentine spring coupling is mainly composed of a serpentine spring sheet embedded in the tooth grooves of the two half-couplings to achieve torque transmission from the active end to the driven end. There is a certain gap between the two half-couplings to compensate for the relative axial displacement between the active end and the driven end. However, the existing serpentine spring coupling is not equipped with a failure protection structure. When the serpentine spring fails, the transmission fails. The half-coupling at the active end cannot transmit torque, which may cause the connected equipment to wear or even damage due to overload. At the same time, there is a speed difference between the two half-couplings, which may cause problems with the alignment of the two shafts, further aggravating the wear and damage of the equipment. In more serious cases, the coupling parts may fly out, causing safety accidents. Summary of the invention

[0004] One advantage of the present application is that it provides a serpentine spring coupling and a failure protection structure thereof to solve or at least partially alleviate the problems in the related art whereby transmission failure when the serpentine spring of the serpentine spring coupling breaks may lead to wear and failure of the connected equipment, problems with alignment of the two shafts between the two half couplings, and even safety accidents.

[0005] Another advantage of the present application is that it provides a serpentine spring coupling and a failure protection structure thereof, wherein a failure protection component is coaxially arranged between the opposite end faces of the two half couplings, and a concave-convex structure thereof is utilized that is arranged opposite to the opposite end face of the driven shaft joint to transmit the torque of the driving shaft joint to the driven shaft joint, thereby replacing the serpentine spring to realize the shaft transmission function, ensuring that the serpentine spring coupling continues to operate when the serpentine spring fails, and providing a failure protection function.

[0006] Another advantage of the present application is that it provides a serpentine spring coupling and its failure protection structure, wherein an elastomer is arranged on one side of the convex body along the circumferential direction to provide a certain elastic variable for the torque transmission between the two shaft joints, so that the shaft transmission system can obtain a better vibration reduction effect, reduce the wear of the two shaft joints, and reduce the risk of damage.

[0007] One or more embodiments of the present application provide a failure protection structure of a serpentine spring coupling, including:

[0008] A driving shaft joint and a driven shaft joint, wherein the driving shaft joint and the driven shaft joint are provided with circumferential teeth on adjacent ends for accommodating the snake spring, and an axial gap is provided between the adjacent ends of the driving shaft joint and the driven shaft joint;

[0009] A failure protection component, the failure protection component is coaxially arranged between the driving shaft joint and the driven shaft joint and includes at least one pair of concave and convex structures adapted to each other;

[0010] When the snake spring of the snake spring coupling fails, the concave-convex structures abut against each other as the driving shaft joint is displaced to replace the snake spring and become a transmission structure between the driving shaft joint and the driven shaft joint.

[0011] According to one embodiment, the failure protection component includes a convex body arranged on the driving shaft joint, and a groove matching the convex body is arranged on the opposite end face of the driven shaft joint, and the convex body and the groove together form the concave-convex structure; the convex body and the groove have a predetermined curvature along the circumferential direction, and during assembly, there is a circumferential assembly gap between each pair of the concave-convex structures.

[0012] According to one embodiment, the outer diameter of the protrusion is smaller than the groove depth diameter of the circumferential tooth, and the inner diameter of the protrusion is larger than the diameter of the shaft hole of the active shaft joint.

[0013] According to one embodiment, the convex body includes at least two bumps, and the at least two bumps are evenly arranged circumferentially. The number of the grooves is the same as the number of the bumps and corresponds one to one, forming a plurality of pairs of the concave-convex structures.

[0014] According to one embodiment, the arc angle of the groove along the circumferential direction is 0-20° greater than the arc angle of the corresponding protrusion along the circumferential direction.

[0015] According to one embodiment, the failure protection assembly further comprises an annular member connecting the plurality of protrusions, and the annular member is integrally formed with the plurality of protrusions.

[0016] According to one embodiment, the protrusion of the failure protection component is mounted on the opposite end surface of the active shaft joint, and a mounting groove matching the failure protection component is provided on the opposite end surface of the active shaft joint.

[0017] According to one embodiment, the protrusion of the failure protection component is integrally formed with the opposite end surface of the active shaft joint and protrudes from the opposite end surface of the active shaft joint.

[0018] According to one embodiment, the failure protection component further includes an elastomer, and the elastomer corresponds to the bumps of the convex body one by one, and the elastomers are all located on the same side of the corresponding bump in the circumferential direction.

[0019] The present application also provides a snake spring coupling, which comprises:

[0020] The failure protection structure of the serpentine spring coupling;

[0021] a serpentine spring assembled into the tooth groove of the circumferential tooth; and

[0022] Two mutually connected half shells are arranged on the outer sides of the failure protection structure and the snake spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0024] Figure 1 It is a schematic diagram of the failure protection structure of the serpentine spring coupling according to some embodiments of the present application.

[0025] Figure 2 It is an exploded assembly diagram of a serpentine spring coupling according to some embodiments of the present application.

[0026] Figure 3 It is a schematic structural diagram of the driving shaft joint and the gear plate after installation according to an embodiment of the present application.

[0027] Figure 4 It is a schematic diagram of a groove structure according to an embodiment of the present application.

[0028] Figure 5 It is an exploded view of a failure protection structure with an elastomer according to the second embodiment of the present application.

[0029] Figure 6 It is a schematic structural diagram of the driving shaft joint and the gear plate after the installation of the elastic body according to the second embodiment of the present application.

[0030] Figure 7 It is a schematic diagram of the groove structure according to the second embodiment of the present application.

[0031] Figure 8 It is an exploded view of a split failure protection structure according to the third embodiment of the present application.

[0032] Fig. 9 It is a schematic structural diagram of the active shaft joint and the split-type protrusion after installation according to the third embodiment of the present application.

[0033] Fig.10 It is a schematic diagram of the groove structure according to the third embodiment of the present application.

[0034] Fig.11It is an exploded view of a split failure protection structure with an elastomer according to the fourth embodiment of the present application.

[0035] Fig.12 It is a schematic structural diagram of the active shaft joint and the split-type protrusion after the installation of the elastic body according to the fourth embodiment of the present application.

[0036] Fig.13 It is a schematic diagram of the groove structure according to the fourth embodiment of the present application.

[0037] Fig.14 It is an exploded view of a failure protection structure with an arc-shaped protrusion according to the fifth embodiment of the present application.

[0038] Fig.15 It is an exploded view of a failure protection structure with an arc-shaped protrusion and an elastomer according to the sixth embodiment of the present application.

[0039] Fig.16 Schematic diagram of the active shaft section structure with arc-shaped protrusions and elastic bodies after assembly according to the sixth embodiment of the present application

[0040] In the figure: 1, serpentine spring coupling; 10, active shaft joint; 101, active circumferential tooth; 102, arc-shaped protrusion; 11, mounting groove; 111, notched groove; 112, ring groove; 12, spring block assembly groove; 20, driven shaft joint; 21, driven circumferential tooth; 22, groove; 2201, groove bottom surface; 2202, curved groove wall; 2203, side groove wall; 30, failure protection component; 31, convex body; 311, convex block; 312, convex ring; 3101, radial top surface; 3102, side surface; 3103, connecting end surface; 32, elastomer; 33, bolt; 40, serpentine spring; 50, half shell. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings showing multiple embodiments of the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without spending creative work will fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific implementation methods, and are not intended to limit this application; the terms "including", "comprising", "having", "having", "containing", "including", etc. in the specification and claims of this application and the above-mentioned figure description are open-ended words. Therefore, "including", "comprising", "having" is a method or device with one or more steps or elements, for example, which has one or more steps or elements, but is not limited to having only these one or more elements. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more.

[0043] In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0046] As mentioned above, it should be emphasized that when the term "includes / comprising" is used in this specification, it is used to clearly indicate the presence of the features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components. As used in this application, the singular forms "a", "an" and "the" also include plural forms, unless the context clearly indicates otherwise.

[0047] The words "a" and "an" in this specification may mean one, but may also be consistent with the meaning of "at least one" or "one or more". The term "about" generally means plus or minus 10% of the mentioned value, or more specifically plus or minus 5%. The term "or" used in the claims means "and / or" unless it is clearly stated that it refers to only alternative solutions.

[0048] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0049] Figure 1 It is a schematic diagram of the failure protection structure of the serpentine spring coupling 1 according to some embodiments of the present application.

[0050] One or more embodiments of the present application disclose a failure protection structure of a snake spring coupling 1. Figures 1 to 16 The failure protection structure of the snake spring coupling 1 includes two half couplings and a failure protection assembly 30, which is specifically implemented as a driving shaft joint 10 connected to the driving end, a driven shaft joint 20 connected to the driven end, and a failure protection assembly 30 coaxially arranged between the driving shaft joint 10 and the driven shaft joint 20. The driving shaft joint 10 and the driven shaft joint 20 are coaxially arranged, and each has an opposite end and a connecting section at both ends, respectively. The opposite end of the driving shaft joint 10 is adjacent to the opposite end of the driven shaft joint 20, and both have circumferential teeth at the end of the opposite end, that is, Figure 1 The active circumferential teeth 101 located at the active shaft joint 10 and the driven circumferential teeth 21 located at the driven shaft joint 20 are used to place the snake spring 40, and there is a certain assembly gap between the two opposite ends to compensate for the relative offset and centering error of the two shafts in the transmission shaft system. The failure protection component 30 is arranged between the active shaft joint 10 and the driven shaft joint 20, and a concave-convex structure that matches each other is arranged on the opposite end surfaces of the active shaft joint 10 and the driven shaft joint 20.

[0051] Preferably, the concave-convex structure has a predetermined curvature along the circumferential direction, and during assembly, there is an assembly gap along the circumferential direction between each pair of concave-convex structures.

[0052] like Figure 1-2 As shown, when the snake spring 40 of the snake spring coupling 1 is working normally, the snake spring 40 transmits the torque of the driving shaft joint 10 to the driven shaft joint 20, so that the driving shaft joint 10 and the driven shaft joint 20 rotate synchronously, and the pair or pairs of concave-convex structures are located between the driving shaft joint 10 and the driven shaft joint 20, maintaining an engaged but not bottoming state, and there is an assembly gap along the circumferential direction between the pair or pairs of concave-convex structures. During the operation of the snake spring coupling 1, the pair or pairs of concave-convex structures are relatively stationary.

[0053] When the spring 40 of the spring coupling 1 breaks or other failure occurs, the function of transmitting torque of the spring 40 fails, the active shaft joint 10 rotates at the speed of the active end, the driven shaft joint 20 is not transmitted with torque, the speed slows down, and an instantaneous speed difference occurs between the active shaft joint 10 and the driven shaft joint 20. At this time, the active shaft joint 10 is affected by its own speed and produces a relative displacement in the circumferential direction. The pair or pairs of concave-convex structures realize the plug-in abutment state with the relative displacement of the active shaft joint 10 in the circumferential direction, so that the active shaft joint 10 can drive the driven shaft joint 20 to rotate, achieving the effect of transmitting torque, so that the spring coupling 1 can still ensure its own shaft connection and shaft transmission functions when the spring 40 fails, and realize the failure protection of the spring coupling 1.

[0054] Among them, since the failure protection component 30 is coaxially arranged between the active shaft joint 10 and the driven shaft joint 20, the pair or pairs of concave-convex structures on the failure protection component 30 have a certain limiting or compensating effect on the radial relative displacement between the two shaft joints due to the structural characteristics of the corresponding concave-convex structures themselves and the structural design limitations of the radial width of the concave parts.

[0055] In the present application, the transmission surface of the failure protection component 30 is defined as parallel to the opposite end surface of the driven shaft joint 20, with the axis extension direction of the driving shaft joint 10 and the driven shaft joint 20 as the axial direction, the tooth distribution direction of the driving circumferential teeth 101 and the driven circumferential teeth 21 as the circumferential direction, and the direction located on the vertical plane of the axis and intersecting the axis as the radial direction. The relative displacement of the driving shaft joint 10 hereinafter defaults to the displacement of the driving shaft joint 10 relative to the driven shaft joint 20.

[0056] In some embodiments of the present application, the failure protection component 30 includes a convex body 31 disposed on the active shaft joint 10, and a groove 22 adapted to the convex body 31 is disposed on the opposite end face of the driven shaft joint 20, and the convex body 31 and the groove 22 together form the concave-convex structure; wherein the convex body 31 and the groove 22 have a predetermined curvature along the circumferential direction, and there is a circumferential assembly gap between the convex body 31 and the groove 22 during assembly. In some optional embodiments, the convex body 31 can be disposed on the opposite end face of the driven shaft joint 20, and the groove 22 is correspondingly disposed on the transmission surface of the failure protection component 30.

[0057] Furthermore, the thickness of the protrusion 31 and the width of the groove 22 are both greater than the circumferential assembly clearance therebetween, so that the protrusion 31 and the groove 22 always remain in an engaged state. When the snake spring 40 fails, the engaged state of the protrusion 31 and the groove 22 can limit the relative displacement between the active shaft joint 10 and the driven shaft joint 20, so that they are within the normal working range, avoiding the active shaft joint 10 from vibrating aggravated by excessive displacement, ensuring the smooth operation of the snake spring coupling 1, and further improving the failure protection effect.

[0058] Furthermore, the curvature of the convex body 31 along the circumferential direction will affect the load or load transmitted by the shaft. A larger curvature can provide a larger contact area in the circumferential direction, thereby improving the load-bearing capacity, so as to replace the snake spring 40 to achieve the shaft transmission effect; the curvature of the groove 22 along the circumferential direction is not less than the curvature of the convex body 31 along the circumferential direction because the convex body 31 needs to be inserted. In some examples of the present application, there is a phase difference between the curvature of the groove 22 and the convex body 31, that is, the curvature of the groove 22 is slightly larger than the length of the convex body 31, resulting in a circumferential assembly gap, such as Figure 1 , 3 , 4, 8-10; In some optional examples, the curvature of the groove 22 is greater than the curvature of the convex body 31, and as shown in Figure 7 and 13 As shown, in the inserted state, the groove 22 also has a portion of inner groove space for accommodating other buffer components to further reduce vibration and wear.

[0059] Next, the protrusion 31 and the groove 22 are described in detail.

[0060] like Figure 1 , Figure 3-16 As shown, the convex body 31 has a radial top surface 3101 and at least two side surfaces 3102, and the groove 22 has a groove bottom surface 2201 and at least one curved groove wall 2202. The two side surfaces 3102 of the convex body 31 are connected by a connecting end surface 3103 to form an end surface of the convex body 31 in the circumferential direction.

[0061] Specifically, the groove 22 also has a side groove wall 2203, and a radial top surface 3101 of the convex body 31 corresponds to the groove bottom surface 2201 of the groove 22. When the snake spring 40 fails, with the circumferential relative displacement of the active shaft joint 10, a side surface 3102 on the convex body 31 abuts against the side groove wall 2203 to form a pair of circumferential abutment surfaces. Optionally, the radial top surface 3101 of the convex body 31 abuts against the groove bottom surface 2201 to form a pair of axial abutment surfaces. The convex body 31 and the groove 22 transmit torque through the force between the circumferential abutment surfaces, replacing the failed snake spring 40 for axial transmission, so as to play a role of failure protection.

[0062] In some examples of the present application, the protrusion 31 is radially located between the axial holes of the two shaft joints and the bottom of the groove of the circumferential tooth, that is, the outer diameter of the protrusion 31 is smaller than the bottom diameter of the groove of the active circumferential tooth 101, and the inner diameter of the protrusion 31 is larger than the diameter of the axial hole of the active shaft joint 10, so as to prevent the protrusion 31 from structurally interfering with the shaft connected to the two shaft joints and the snake spring 40 when the snake spring 40 fails, thereby affecting the shaft transmission function of the failure protection component 30.

[0063] like Figure 1 , Figure 3-7 As shown, the curved groove wall 2202 of the groove 22 corresponds to and contacts the two connecting end surfaces 3103 of the convex body 31, as shown in FIG. Figure 8-16 As shown, each of the grooves 22 has two curved groove walls 2202, which respectively correspond to and contact the two connecting end faces 3103 of the convex body 31 with different radii. When the snake spring 40 fails, the active shaft joint 10 undergoes a predetermined relative displacement in the circumferential direction, and friction is generated between the curved groove wall 2202 of the groove 22 and the connecting end face 3103 of the convex body 31 to assist in the transmission of torque. At the same time, the curved contact can distribute the load more evenly, reduce stress concentration, provide smoother force transmission, and help maintain the smooth operation between the two shaft joints.

[0064] like Figures 8 to 16 As shown, the protrusion 31 is implemented as an arc-shaped part, and the groove 22 is implemented as an arc-shaped hole-shaped groove 22 matching the arc-shaped part. The end faces of the protrusion 31 and the groove 22 in the circumferential direction are both connecting surfaces extending in an arc direction, which reduces the difficulty in processing and manufacturing the concave-convex structure.

[0065] In some optional embodiments, at least one side surface 3102 of the protrusion 31 in the circumferential direction is an inclined connecting surface, and a certain angle is formed between the inclined connecting surface and the connecting end surface 3103 on the end of the protrusion 31. Correspondingly, at least one side groove wall 2203 on the groove 22 is an inclined groove wall, so as to increase the friction between the protrusion 31 and the groove 22, and further limit the circumferential relative displacement and radial relative displacement of the active shaft joint 10 when the snake spring 40 fails.

[0066] In some embodiments of the present application, the convex body 31 includes at least two protrusions 311, and at least two of the protrusions 311 are uniformly arranged on the transmission surface of the failure protection component 30 in the circumferential direction. The number of the grooves 22 is the same as the number of the protrusions 311, and they correspond one to one to form multiple pairs of concave-convex structures. It can be understood that the number of protrusions 311 included in the convex body 31 is not limited, such as two, three, four, five, six, eight or ten protrusions 311. The circumferential curvature of the groove 22 is 0-20° larger than the circumferential curvature of the corresponding protrusion 311, preferably 3-15°, so as to provide a phase difference between the corresponding protrusions 311 under the groove 22.

[0067] In at least one embodiment, the convex body 31 includes four bumps 311, and the four bumps 311 are evenly distributed circumferentially on the transmission surface of the failure protection component 30. The groove 22 located on the opposite end surface of the driven shaft joint 20 corresponds one-to-one to the bumps 311, forming four pairs of the concave-convex structures.

[0068] In some optional embodiments, the failure protection component 30 further includes a protruding ring 312 connecting the plurality of protruding blocks 311, such as Figure 1 , Figure 3-7 As shown, the convex ring 312 is integrally formed with the plurality of protrusions 311 to form a gear plate, thereby preventing the split protrusions 311 from being stuck in the grooves 22 due to angle problems, thereby ensuring the torque transmission function of the plurality of pairs of concave-convex structures.

[0069] In some embodiments of the present application, the failure protection component 30 is installed on the opposite end surface of the active shaft joint 10, and the opposite end surface of the active shaft joint 10 is provided with a mounting groove 11 matching the failure protection component 30, and the mounting groove 11 may include a plurality of notched grooves 111 having an annular groove 112 and communicating with the annular groove 112 and having three side walls, such as Figures 1 to 6 It can also be a hole-shaped groove with four side walls, such as Figures 8 to 16 as shown in .

[0070] In some specific embodiments, the protrusion 31 is a plurality of fixedly mounted protrusions 311 or a gear plate having a plurality of protrusions 311, such as Figure 1 , Figure 3-13 As shown, the protrusion 311 is fixed to the mounting groove 11 of the driving shaft joint 10 by a bolt 33. A screw hole is provided in the mounting groove 11. After installation, the protrusion 311 protrudes axially from the opposite end face of the driving shaft joint 10, and the axial thickness of the protruding portion is greater than the axial assembly clearance between the driving shaft joint 10 and the driven shaft joint 20, so as to ensure that the protrusion 311 is always inserted in the groove 22 of the driven shaft joint 20.

[0071] In some embodiments of the present application, the failure protection component 30 is integrally formed with the opposite end face of the active shaft joint 10 and protrudes from the opposite end face of the active shaft joint 10 . In this case, the transmission surface of the failure protection component 30 is the opposite end face of the active shaft joint 10 .

[0072] In some specific embodiments, the protrusion 31 is a plurality of arc-shaped protrusions 102 located on opposite end surfaces of the driving shaft joint 10, such as Figures 14 to 16 As shown, the arc-shaped protrusions 102 protrude axially from the opposite end faces of the driving shaft joint 10, and the axial thickness of the arc-shaped protrusions 102 is greater than the axial assembly clearance between the driving shaft joint 10 and the driven shaft joint 20 to ensure that the arc-shaped protrusions 102 are always inserted into the grooves 22 of the driven shaft joint 20.

[0073] In some embodiments of the present application, the failure protection component 30 further includes an elastic body 32, the elastic body 32 corresponds to the convex body 31 one by one, and the elastic body 32 is located on the same side of the corresponding convex body 31 in the circumferential direction, such as Figure 5-6 , Figure 11-12 as well as Figure 15-16 As shown, multiple elastic bodies 32 correspond to multiple protrusions 311 or multiple arc-shaped protrusions 102 one by one, and the elastic bodies 32 are all located on the same side of the corresponding protrusions 311 or the arc-shaped protrusions 102 in the angular direction, providing a certain elastic variable for the torque transmission between the two shaft joints, so that the shaft transmission system can obtain a better vibration reduction effect, reduce the wear of the two shaft joints, and reduce the risk of damage. After the elastic body 32 is set, the groove 22 and the corresponding protrusion 311 and the elastic body 32 can be set to seamlessly engage, that is, the protrusion 311 and the elastic body 32 are assembled in the corresponding groove 22 and no circumferential gap is generated during assembly.

[0074] Specifically, a spring block assembly groove 12 is provided in the mounting groove 11 of the active shaft joint 10 or on the opposite end face of the active shaft joint 10 for assembling the elastomer 32. The spring block assembly groove 12 corresponds one-to-one with the elastomer 32, and the elastomer 32 corresponds one-to-one with the convex body 31, that is, the spring block assembly groove 12 corresponds one-to-one with the convex body 31 or the corresponding mounting groove 11. The spring block assembly groove 12 is located on the same side of the corresponding mounting groove 11 or the arc-shaped protrusion 102 in the circumferential direction so as to assemble the elastomer 32.

[0075] More specifically, the block assembly groove 12 is connected to the installation groove 11, and the depth of the block assembly groove 32 is less than the depth of the installation groove 11, so that the elastic body 12 abuts against the side groove wall 2203 of the groove 22 when the snake spring 40 fails, thereby applying force to the convex body 31 in the groove 22, thereby assisting in the transmission of torque. After the elastic body 32 is assembled, it is flush with the radial top surface 3101 of the convex body 31 on the radial surface.

[0076] One or more embodiments of the present application also disclose a snake spring coupling 1. Figure 2 The serpentine spring coupling 1 includes the above-mentioned failure protection structure, a serpentine spring 40 and two interconnected half-shells 50, the serpentine spring 40 is assembled in the tooth grooves of the active circumferential teeth 101 and the driven circumferential teeth 21, and the two half-shells 50 are sealed and arranged outside the failure protection structure and the serpentine spring 40 to fix the relative position of the active shaft section 10 and the driven shaft section 20. The two half-shells 50 are connected to each other, clamping and sealingly connecting the connecting section of the active shaft section 10 and the connecting section of the driven shaft section 20.

[0077] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. The failure protection structure of the serpentine spring coupling is characterized by: include: A driving shaft joint and a driven shaft joint, wherein the driving shaft joint and the driven shaft joint are provided with circumferential teeth on adjacent ends for accommodating the snake spring, and an axial gap is provided between the adjacent ends of the driving shaft joint and the driven shaft joint; as well as A failure protection component, the failure protection component is coaxially arranged between the driving shaft joint and the driven shaft joint and includes at least one pair of concave and convex structures adapted to each other; When the snake spring of the snake spring coupling fails, the concave-convex structures abut against each other as the driving shaft joint is displaced to replace the snake spring and become a transmission structure between the driving shaft joint and the driven shaft joint.

2. The failure protection structure of the serpentine spring coupling according to claim 1, characterized in that: The failure protection component includes a convex body arranged on the active shaft joint, and a groove matched with the convex body is arranged on the opposite end face of the driven shaft joint, and the convex body and the groove together form the concave-convex structure; the convex body and the groove have a predetermined curvature along the circumferential direction, and during assembly, there is a circumferential assembly gap between each pair of the concave-convex structures.

3. The failure protection structure of the serpentine spring coupling according to claim 2, characterized in that: The outer diameter of the protrusion is smaller than the groove depth diameter of the circumferential tooth, and the inner diameter of the protrusion is larger than the axial hole diameter of the active shaft joint.

4. The failure protection structure of the serpentine spring coupling according to claim 2, characterized in that: The convex body includes at least two protrusions, and the at least two protrusions are evenly arranged in the circumferential direction. The number of the grooves is the same as the number of the protrusions, and they correspond one to one, forming a plurality of pairs of the concave-convex structures.

5. The failure protection structure of the serpentine spring coupling according to claim 4, characterized in that: The arc angle of the groove along the circumferential direction is 0-20° greater than the arc angle of the corresponding protrusion along the circumferential direction.

6. The failure protection structure of the serpentine spring coupling according to claim 4, characterized in that: The failure protection component also includes an annular member connecting the plurality of protrusions, wherein the annular member is integrally formed with the plurality of protrusions.

7. The failure protection structure of the serpentine spring coupling according to claim 1, characterized in that: The protrusion of the failure protection component is installed on the opposite end surface of the active shaft joint, and the opposite end surface of the active shaft joint is provided with a mounting groove matching the failure protection component.

8. The failure protection structure of the serpentine spring coupling according to claim 2, characterized in that: The convex body of the failure protection component is integrally formed with the opposite end surface of the active shaft joint and protrudes from the opposite end surface of the active shaft joint.

9. The failure protection structure of the serpentine spring coupling according to claim 1, characterized in that: The failure protection component also includes an elastic body, which corresponds to the bumps of the convex body one by one, and the elastic bodies are all located on the same side of the corresponding bump in the circumferential direction.

10. Snake spring coupling, characterized in that: include: A failure protection structure of a serpentine spring coupling as described in any one of rights 1 to 9; A snake spring is assembled into the tooth groove of the circumferential tooth; as well as Two mutually connected half shells are arranged on the outer sides of the failure protection structure and the snake spring.

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