CN119554331A - Snake spring coupling and its failure protection structure - Google Patents

Abstract

The embodiments of the present application provide a serpentine spring coupling and a failure protection structure thereof. The failure protection structure includes an active shaft joint, a driven shaft joint and a failure protection component. The failure protection component includes at least one pair of mutually adapted concave-convex structures. When assembled, each pair of concave-convex structures has a circumferential gap. When the serpentine spring of the serpentine spring coupling fails, the concave-convex structures abut against each other as the active shaft joint is displaced. The present application replaces the serpentine spring by coaxially arranging a failure protection component between the opposite end faces of the two half couplings to realize the shaft transmission function, ensure the serpentine spring coupling continues to operate when the serpentine spring fails, and provide a failure protection function.

Description

Snake spring coupling and failure protection structure thereof

Technical Field

The application relates to the field of couplings, in particular to a snake spring coupling and a failure protection structure thereof.

Background

The snake spring coupling is a high-performance elastic coupling for transmitting torque and absorbing vibration, is suitable for connecting two coaxial medium-high power transmission shafting, has certain performance of compensating relative deflection of two shafts and damping and buffering, and is widely applied to occasions requiring shaft connection and shaft transmission in the fields of heavy machinery, wind power generation, rail transit and the like.

In the related art, the serpentine spring coupling is mainly composed of serpentine spring pieces embedded in tooth grooves of two half couplings, and torque transmission from a driving end to a driven end is achieved. Wherein, there is certain clearance between two half couplings to compensate the relative displacement in axial direction between driving end and driven end. However, when the existing snake spring coupling fails, the transmission fails, and the half coupling at the driving end cannot be transmitted with torque, so that connected equipment is possibly worn and even damaged due to overload, meanwhile, a rotation speed difference is generated between the two half couplings, the problem of centering of two shafts is possibly caused, the wear and damage of the equipment are further aggravated, the situation that parts of the coupling fly out is more seriously caused, and safety accidents are caused.

Disclosure of Invention

The application has the advantages that the application provides the snake spring coupling and the failure protection structure thereof, so as to solve or at least partially relieve the problems of abrasion and faults of connected equipment, two-axis centering between two half couplings, even safety accidents and the like caused by transmission failure when the snake springs of the snake spring coupling in the related art are broken.

The application further has the advantage of providing the snake spring coupling and the failure protection structure thereof, wherein the failure protection assembly is coaxially arranged between the opposite end surfaces of the two half couplings, and the concave-convex structure arranged opposite to the opposite end surfaces of the driven shaft joint is utilized to transmit the torque of the driving shaft joint to the driven shaft joint so as to replace a snake spring, thereby realizing the shaft transmission function, ensuring the continuous operation of the snake spring coupling when the snake spring fails, and providing the failure protection function.

The application further has the advantage of providing the snake spring coupling and the failure protection structure thereof, wherein the elastic body is arranged on one side of the convex body along the circumferential direction, so that a certain elastic variable is provided for torque transmission between two shaft joints, a good vibration reduction effect is achieved for the shaft transmission system, the abrasion of the two shaft joints is reduced, and the damage risk is reduced.

One or more embodiments of the present application provide a fail-safe structure of a snake-spring coupling, including:

The driving shaft section and the driven shaft section are provided with circumferential teeth at the adjacent ends of the driving shaft section and the driven shaft section, the circumferential teeth are used for accommodating a snake spring, and an axial gap is formed between the adjacent ends of the driving shaft section and the driven shaft section;

The failure protection assembly is coaxially arranged between the driving shaft section and the driven shaft section and comprises at least one pair of concave-convex structures which are mutually matched;

When the snake spring of the snake spring coupling fails, the concave-convex structures are mutually abutted along with the displacement of the driving shaft joint to replace the snake spring to form a transmission structure between the driving shaft joint and the driven shaft joint.

According to one embodiment, the failure protection assembly comprises a convex body arranged on the driving shaft section, grooves matched with the convex body are formed in opposite end faces of the driven shaft section, the convex body and the grooves jointly form a concave-convex structure, the convex body and the grooves have a preset radian along the circumferential direction, and a circumferential assembly gap is formed between each pair of concave-convex structures during assembly.

According to one embodiment, the outer diameter of the convex body is smaller than the groove depth diameter of the circumferential teeth, and the inner diameter of the convex body is larger than the hole diameter of the shaft hole of the driving shaft section.

According to one embodiment, the convex body comprises at least two convex blocks, at least two convex blocks are circumferentially and uniformly arranged, the number of the grooves is the same as that of the convex blocks, and the grooves are in one-to-one correspondence with the convex blocks, so that a plurality of pairs of concave-convex structures are formed.

According to one embodiment, the curvature of the groove in the circumferential direction is 0-20 ° greater than the curvature of the corresponding projection in the circumferential direction.

According to one embodiment, the fail safe assembly further comprises a ring member connecting a plurality of the bosses, the ring member being integrally formed with the plurality of bosses.

According to one embodiment, the bosses of the fail safe assembly are mounted on opposite end surfaces of the drive shaft section, and the opposite end surfaces of the drive shaft section are provided with mounting slots that mate with the fail safe assembly.

According to one embodiment, the protrusion of the fail safe assembly is integrally formed with and protrudes from an opposite end face of the drive shaft section.

According to one embodiment, the fail safe assembly further comprises an elastomer, wherein the elastomer corresponds to the convex blocks of the convex body one by one, and the elastomer is located on the same side face of the corresponding convex block in the circumferential direction.

The application also provides a snake spring coupling, comprising:

the snake spring coupling is a failure protection structure of (a);

a snake spring fitted into the tooth groove of the circumferential tooth, and

Two interconnected half shells are provided outside the fail-safe structure and the snake spring.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following brief description will be given to the accompanying drawings of the embodiments, and it is apparent that the accompanying drawings in the following description relate only to some embodiments of the present application, not to limit the present application.

Fig. 1 is a schematic view of a fail-safe structure of a serpentine coupling according to some embodiments of the present application.

Fig. 2 is an exploded assembly view of a snake spring coupling according to some embodiments of the application.

Fig. 3 is a schematic view of the structure of the drive shaft section and the gear plate after the installation according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a groove structure according to an embodiment of the present application.

Fig. 5 is an exploded view of a fail-safe structure with an elastomer according to a second embodiment of the present application.

Fig. 6 is a schematic view of a mounted drive shaft segment and gear plate with an elastomer according to a second embodiment of the present application.

Fig. 7 is a schematic diagram of a groove structure according to a second embodiment of the present application.

Fig. 8 is an exploded view of a split fail-safe structure according to a third embodiment of the present application.

Fig. 9 is a schematic structural view of a driving shaft section and a split type bump after the installation according to the third embodiment of the present application.

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

Fig. 11 is an exploded view of a split fail-safe structure with an elastomer according to a fourth embodiment of the present application.

Fig. 12 is a schematic view showing a structure of a driving shaft section and a split type bump after the installation with an elastic body according to a fourth embodiment of the present application.

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

Fig. 14 is an exploded view of a fail-safe structure having arcuate projections according to a fifth embodiment of the present application.

Fig. 15 is an exploded view of a fail-safe structure having arcuate projections and an elastic body according to a sixth embodiment of the present application.

FIG. 16 is a schematic view showing a structure of a driving shaft segment having arc-shaped protrusions and an elastic body after assembly according to a sixth embodiment of the present application

In the figure, 1, a snake spring coupling, 10, a driving shaft joint, 101, a driving circumferential tooth, 102, an arc-shaped bulge, 11, a mounting groove, 111, a notch groove, 112, an annular groove, 12, a spring block mounting groove, 20, a driven shaft joint, 21, a driven circumferential tooth, 22, a groove, 2201, a groove bottom surface, 2202, a curved groove wall, 2203, a side groove wall, 30, a failure protection component, 31, a convex body, 311, a lug, 312, a convex ring, 3101, a radial top surface, 3102, a side surface, 3103, a connecting end surface, 32, an elastic body, a bolt, 40, a snake spring, 50 and a half shell.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings showing various embodiments according to the present application, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art without undue burden on the person of ordinary skill in the art based on the embodiments described herein, are intended to be within the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used in the description of this application are used for the purpose of describing particular embodiments only and are not intended to be limiting of this application, and the terms "comprising," "including," "having," "containing," etc. in this description and in the claims and the above description of the drawings are open-ended terms. Thus, a method or apparatus that "comprises," includes, "" has "or" has, for example, one or more steps or elements, but is not limited to having only the one or more elements. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be understood that the terms "center", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the described embodiments of the application may be combined with other embodiments.

As noted above, it should be emphasized that the term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "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 that the value mentioned is plus or minus 10%, or more specifically plus or minus 5%. The term "or" as used in the claims means "and/or" unless explicitly indicated to the contrary, only alternatives are indicated.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

Fig. 1 is a schematic view of a fail-safe structure of a serpentine coupling 1 according to some embodiments of the present application.

One or more embodiments of the present application disclose a fail-safe structure for a serpentine coupling 1. Referring to fig. 1 to 16, the fail-safe structure of the serpentine coupler 1 includes two half-couplers and a fail-safe assembly 30, which is embodied as a driving shaft section 10 connected to a driving end, a driven shaft section 20 connected to a driven end, and a fail-safe assembly 30 coaxially disposed between the driving shaft section 10 and the driven shaft section 20. The driving shaft section 10 and the driven shaft section 20 are coaxially arranged, and have an opposite end and a connecting section at both ends, respectively, the opposite end of the driving shaft section 10 is adjacent to the opposite end of the driven shaft section 20, and have circumferential teeth at the ends of the opposite ends, that is, the driving circumferential teeth 101 located in the driving shaft section 10 and the driven circumferential teeth 21 located in the driven shaft section 20 as shown in fig. 1, for placing the snake spring 40, and a certain assembly gap is provided between the two opposite ends for compensating the relative offset and centering error of the two shafts in the transmission shafting. The fail-safe assembly 30 is disposed between the driving shaft section 10 and the driven shaft section 20, and is provided with mutually-adapted concave-convex structures on opposite end surfaces of the driving shaft section 10 and the driven shaft section 20.

Wherein, preferably, the concave-convex structure has a predetermined radian along the circumferential direction, and there is an assembly gap along the circumferential direction between each pair of the concave-convex structures when assembled.

As shown in fig. 1-2, in the case where the snake 40 of the snake-spring coupling 1 is operating normally, the snake 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, the pair or pairs of concave-convex structures are located between the driving shaft joint 10 and the driven shaft joint 20, the pair or pairs of concave-convex structures are kept in a plugged but non-bottoming state, an assembly gap along the circumferential direction exists between the pair or pairs of concave-convex structures, and the pair or pairs of concave-convex structures are relatively static during the operation of the snake-spring coupling 1.

In the case that the coil spring 40 of the coil spring coupling 1 breaks or other failure faults occur, the function of transmitting torque of the coil spring 40 fails, the driving shaft section 10 rotates at the rotation speed of the driving end, the driven shaft section 20 is not transmitted with torque, the rotation speed is reduced, an instant rotation speed difference is generated between the driving shaft section 10 and the driven shaft section 20, and at the moment, the driving shaft section 10 is influenced by the rotation speed of the driving shaft section itself, and relative displacement along the circumferential direction is generated. The pair or the pairs of concave-convex structures realize the insertion and abutting state along with the relative displacement of the driving shaft joint 10 along the circumferential direction, so that the driving shaft joint 10 can drive the driven shaft joint 20 to rotate, the effect of transmitting torque is achieved, the function of shaft connection and shaft transmission of the snake spring coupler 1 can be ensured when the snake spring 40 fails, and the failure protection of the snake spring coupler 1 is realized.

Because the fail-safe assembly 30 is coaxially disposed between the driving shaft section 10 and the driven shaft section 20, the pair or pairs of concave-convex structures on the fail-safe assembly 30 have a certain limiting effect or compensation effect on the radial relative displacement between the two shaft sections due to the structural characteristics corresponding to the concave-convex structure of the fail-safe assembly and the structural design limitation of the radial width of the concave-convex structure.

In the present application, the driving surface of the fail-safe assembly 30 is defined as being parallel to the opposite end surfaces of the driven shaft section 20, with the axial extending directions of the driving shaft section 10 and the driven shaft section 20 as axial directions, with the tooth body distribution directions of the driving circumferential teeth 101 and the driven circumferential teeth 21 as circumferential directions, and with the directions on the vertical plane of the axis and intersecting the axis as radial directions. The relative displacement of the driving shaft section 10 is default to the displacement of the driving shaft section 10 with respect to the driven shaft section 20 hereinafter.

In some embodiments of the present application, the fail safe assembly 30 includes a protrusion 31 disposed on the driving shaft section 10, and a groove 22 adapted to the protrusion 31 is disposed on an opposite end surface of the driven shaft section 20, where the protrusion 31 and the groove 22 have a predetermined curvature along a circumferential direction, and a circumferential assembly gap is formed between the protrusion 31 and the groove 22 when assembled. In some alternative embodiments, the protrusions 31 may be disposed on opposite end surfaces of the driven shaft section 20, and the grooves 22 may be correspondingly disposed on the driving surface of the fail safe assembly 30.

Further, the thickness of the convex body 31 and the groove width of the groove 22 are both larger than the circumferential assembly gap between the convex body 31 and the groove 22, so that the convex body 31 and the groove 22 always keep an inserting state, when the snake spring 40 fails, the inserting state of the convex body 31 and the groove 22 can limit the relative displacement between the driving shaft section 10 and the driven shaft section 20, so that the relative displacement between the driving shaft section 10 and the driven shaft section 20 is prevented from being aggravated by excessive displacement in a normal working range, the stable operation of the snake spring coupler 1 is ensured, and the failure protection effect is further improved.

Further, the circumferential curvature of the convex body 31 affects the load or load transferred by the shaft, the larger curvature provides a larger contact area in the circumferential direction, so as to improve the bearing capacity, instead of the snake spring 40, so that the shaft transfer effect is achieved, the groove 22 needs to be inserted into the convex body 31, the circumferential curvature of the groove is not smaller than the circumferential curvature of the convex body 31, in some examples of the application, the curvature of the groove 22 is out of phase with the convex body 31, i.e. the curvature of the groove 22 is slightly larger than the length of the convex body 31, so as to generate a circumferential assembly gap, as shown in fig. 1,3, 4 and 8-10, and in some alternative examples, the curvature of the groove 22 is larger than the curvature of the convex body 31, and in the inserted state, as shown in fig. 7 and 13, the groove 22 also has a part of an in-groove space for accommodating other buffer parts so as to further damp and reduce wear.

The convex body 31 and the concave groove 22 will be specifically described below.

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

Specifically, the groove 22 further has a side groove wall 2203, a radial top surface 3101 of the convex body 31 corresponds to a groove bottom surface 2201 of the groove 22, and when the spring 40 fails, a side surface 3102 of the convex body 31 and the side groove wall 2203 abut against each other along with the circumferential relative displacement of the driving shaft section 10, so as to form a pair of abutting surfaces in the circumferential direction. Optionally, the radial top surface 3101 of the convex body 31 and the groove bottom surface 2201 abut each other to form a pair of axial abutting surfaces. The convex body 31 and the groove 22 transmit torque through force between abutting surfaces in the circumferential direction, and replace the failed snake spring 40 to perform shaft transmission so as to play a role of failure protection.

In some examples of the application, the protrusion 31 is located radially between the shaft holes of the two shaft joints and the groove bottoms of the circumferential teeth, i.e., the outer diameter of the protrusion 31 is smaller than the groove bottom diameter of the driving circumferential teeth 101, and the inner diameter of the protrusion 31 is larger than the hole diameter of the shaft hole of the driving shaft joint 10, so that structural interference between the shaft connected with the two shaft joints and the snake spring 40 when the snake spring 40 fails is prevented, thereby affecting the shaft transmission function of the fail-safe assembly 30.

As shown in fig. 1 and 3-7, the curved groove wall 2202 of the groove 22 corresponds to and contacts the two connecting end faces 3103 of the convex body 31, and as shown in fig. 8-16, each groove 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 driving shaft section 10 generates preset relative displacement in the circumferential direction, friction force is generated between the curved groove wall 2202 of the groove 22 and the connecting end face 3103 of the convex body 31, so that torque transmission is assisted, meanwhile, load can be distributed more uniformly through curved surface contact, stress concentration is reduced, smoother force transmission is provided, and stable operation between the two shaft sections is facilitated.

As shown in fig. 8 to 16, the convex body 31 is implemented as an arc-shaped piece, the groove 22 is implemented as an arc-shaped hole-shaped groove 22 matched with the arc-shaped piece, the end surfaces of the convex body 31 and the groove 22 in the circumferential direction are all connecting surfaces extending in an arc direction, and the difficulty in processing and manufacturing the concave-convex structure is reduced.

In some alternative embodiments, at least one side 3102 of the convex body 31 in the circumferential direction is an inclined connection surface, and an angle is formed between the inclined connection surface and the connection end surface 3103 on the end of the convex body 31, and correspondingly, at least one side groove wall 2203 on the groove 22 is an inclined groove wall, so as to increase friction between the convex body 31 and the groove 22, and further limit the circumferential relative displacement and the radial relative displacement of the driving shaft section 10 when the snake 40 fails.

In some embodiments of the present application, the convex body 31 includes at least two protruding blocks 311, at least two protruding blocks 311 are circumferentially and uniformly disposed on the transmission surface of the fail-safe assembly 30, and the number of the grooves 22 is the same as the number of the protruding blocks 311 and corresponds to one another, so as to form a plurality of pairs of concave-convex structures. It is understood that the number of the bumps 311 included in the convex body 31 is not limited, such as two, three, four, five, six, eight or ten bumps 311. The curvature of the groove 22 in the circumferential direction is 0-20 deg., preferably 3-15 deg., greater than the curvature of the corresponding bump 311 in the circumferential direction, thus providing a phase difference between the corresponding bumps 311 under the groove 22.

In at least one embodiment, the convex body 31 includes four protruding blocks 311, the four protruding blocks 311 are circumferentially and uniformly distributed on the driving surface of the fail-safe assembly 30, and the grooves 22 located on opposite end surfaces of the driven shaft section 20 are in one-to-one correspondence with the protruding blocks 311, so as to form four pairs of concave-convex structures.

In some alternative embodiments, the fail-safe assembly 30 further includes a collar 312 connected to the plurality of bumps 311, as shown in fig. 1 and fig. 3-7, the collar 312 and the plurality of bumps 311 are integrally formed to form a gear plate, so that the situation that the split bumps 311 are blocked in the grooves 22 due to an angle problem is avoided, and a torque transmission function of a plurality of pairs of concave-convex structures is ensured.

In some embodiments of the present application, the fail safe assembly 30 is mounted on opposite end surfaces of the driving shaft section 10, and the opposite end surfaces of the driving shaft section 10 are provided with mounting grooves 11 matching with the fail safe assembly 30, and the mounting grooves 11 may be a plurality of notch grooves 111 having ring grooves 112 and three side walls communicating with the ring grooves 112, as shown in fig. 1 to 6. But also a hole-like slot with four side walls as shown in fig. 8 to 16.

In some embodiments, the protruding body 31 is a plurality of protruding blocks 311 or a gear plate with a plurality of protruding blocks 311, as shown in fig. 1 and fig. 3-13, the protruding blocks 311 are fixed in the mounting groove 11 of the driving shaft section 10 by bolts 33, screw holes are provided in the mounting groove 11, the protruding blocks 311 after being mounted protrude from opposite end surfaces of the driving shaft section 10 in the axial direction, and the axial thickness of the protruding parts is greater than the axial assembly gap between the driving shaft section 10 and the driven shaft section 20, so as to ensure that the protruding blocks 311 are always inserted into the grooves 22 of the driven shaft section 20.

In some embodiments of the present application, the fail safe assembly 30 is integrally formed with the opposite end face of the main shaft section 10 and protrudes from the opposite end face of the main shaft section 10, where the driving surface of the fail safe assembly 30 is the opposite end face of the main shaft section 10.

In some embodiments, the protruding body 31 is a plurality of arc-shaped protrusions 102 located on opposite end surfaces of the driving shaft section 10, as shown in fig. 14 to 16, the arc-shaped protrusions 102 protrude from opposite end surfaces of the driving shaft section 10 in the axial direction, and the axial thickness of the arc-shaped protrusions 102 is greater than the axial assembly gap between the driving shaft section 10 and the driven shaft section 20, so as to ensure that the arc-shaped protrusions 102 are always inserted into the grooves 22 of the driven shaft section 20.

In some embodiments of the present application, the fail-safe assembly 30 further includes an elastic body 32, the elastic body 32 is in one-to-one correspondence with the convex body 31, and the elastic bodies 32 are located on the same side of the corresponding convex body 31 in the circumferential direction, as shown in fig. 5-6, 11-12 and 15-16, the elastic bodies 32 are in one-to-one correspondence with the plurality of the protruding blocks 311 or the plurality of the arc-shaped protruding blocks 102, and the elastic bodies 32 are located on the same side of the corresponding protruding blocks 311 or the arc-shaped protruding blocks 102 in the angular direction, so as to provide a certain elastic variable for torque transmission between two shaft joints, so that the shaft transmission system obtains a better vibration damping effect, reduces wear of the two shaft joints, and reduces damage risk. After the provision of the elastic body 32, the groove 22 and the corresponding projection 311 and elastic body 32 may be provided in seamless engagement, i.e., the projection 311 and elastic body 32 are assembled within the corresponding groove 22 and no circumferential gap of assembly is created.

Specifically, the installation groove 11 of the driving shaft section 10 or the opposite end surface of the driving shaft section 10 is provided with a spring block assembly groove 12 for assembling the elastic body 32, the spring block assembly groove 12 is in one-to-one correspondence with the elastic body 32, the elastic body 32 is in one-to-one correspondence with the convex body 31, that is, the spring block assembly groove 12 is in one-to-one correspondence with the convex body 31 or the installation groove 11 corresponding thereto, and the spring block assembly groove 12 is located on the same side of the installation groove 11 corresponding thereto or the arc-shaped protrusion 102 in the circumferential direction so as to assemble the elastic body 32.

More specifically, the spring block fitting groove 12 communicates with the mounting groove 11, and the groove depth of the spring block fitting groove 32 is smaller than that of the mounting 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 exerting a force in the groove 22 to the convex body 31, thereby assisting in achieving torque transmission. Wherein, the elastic body 32 is flush with the radial top surface 3101 of the convex body 31 on the radial surface after being assembled.

One or more embodiments of the application also disclose a snake spring coupling 1. Referring to fig. 2, the snake spring coupling 1 includes the fail-safe structure as described above, a snake spring 40 and two interconnected half shells 50, the snake spring 40 being fitted in the tooth grooves of the driving circumferential teeth 101 and the driven circumferential teeth 21, the two half shells 50 being sealingly disposed outside the fail-safe structure and the snake spring 40 to fix the relative positions of the driving shaft joint 10 and the driven shaft joint 20. Wherein the two half shells 50 are connected to each other, clamping and sealing the connection section of the drive shaft section 10 and the connection section of the driven shaft section 20.

The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.

Claims (10)

1. A failure protection structure of a serpentine spring coupling, characterized in that it comprises: 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 serpentine spring, and an axial gap is provided between adjacent ends of the driving shaft joint and the driven shaft joint; and 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 as described in claim 1 is characterized in that 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. 3. The failure protection structure of the serpentine spring coupling as described in claim 2 is 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 as described in claim 2 is characterized in that the convex body includes at least two bumps, at least two of the bumps are evenly arranged circumferentially, the number of the grooves is the same as the number of the bumps, and they correspond one to one to form a plurality of pairs of the concave-convex structures. 5. The failure protection structure of the serpentine spring coupling as described in claim 4 is characterized in that the arc of the groove along the circumferential direction is 0-20° larger than the arc of the corresponding protrusion along the circumferential direction. 6. The failure protection structure of the serpentine spring coupling as described in claim 4 is characterized in that the failure protection component also includes an annular member connecting the plurality of the protrusions, and the annular member is integrally formed with the plurality of the protrusions. 7. The failure protection structure of the serpentine spring coupling as described in claim 1 is characterized in that the protrusion of the failure protection component is installed on the opposite end face of the active shaft joint, and a mounting groove matching the failure protection component is provided on the opposite end face of the active shaft joint. 8. The failure protection structure of the serpentine spring coupling as described in claim 2 is characterized in that 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. 9. The failure protection structure of the serpentine spring coupling as described in claim 1 is characterized in that the failure protection component also includes an elastomer, the elastomer corresponds one-to-one with the protrusion of the convex body, and the elastomers are all located on the same side of the corresponding protrusion in the circumferential direction. 10. The serpentine spring coupling is characterized by comprising: A failure protection structure of a serpentine spring coupling as described in any one of rights 1 to 9; a snake spring assembled into the tooth groove of the circumferential tooth; and Two mutually connected half shells are arranged on the outer sides of the failure protection structure and the snake spring.