A transmission component

Abstract

The present invention relates to the technical field of transmission shafts, and more specifically, to a transmission assembly. The transmission assembly comprises a first fork unit, an axis unit, an anti-rotation unit, a second fork unit, and a locking unit. The first fork unit comprises a first connecting module. The first connecting module comprises a first connector, a keyway hole, a first contraction groove, and a locking hole. The axis unit comprises a first connecting shaft, a second connecting shaft, and a third connecting shaft. The first connecting shaft comprises a first spline shaft, a first positioning groove, and a snap-fit ​​hole. The anti-rotation unit comprises a connecting plate, a snap-fit ​​head, and a locking tongue module. The locking unit passes through the locking hole. The transmission assembly also comprises a locking state. The locking state comprises that the locking unit squeezes the two ends of the locking hole, driving the width of the first contraction groove to decrease, and the reduction in the width of the first contraction groove drives the width of the second contraction groove to decrease. In this way, the problem of improving the installation accuracy of the transmission assembly is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission shafts, and in particular to a transmission assembly. Background Art

[0002] The transmission assembly usually fixes the first fork unit at one end of the shaft unit by spline connection, and fixes the second fork unit at the other end of the shaft unit by flat key connection. The first fork unit and the second fork unit are detachably connected to different components, respectively, so as to realize the transmission of force or torque. During the installation of the first fork unit and the second fork unit to the shaft unit, the first fork unit and the second fork unit are arranged along the axis of the shaft unit, and the first fork unit and the second fork unit are required to have the same installation angle in the axis direction of the shaft unit, that is, the projections of the first fork unit and the second fork unit along the axis direction of the shaft unit overlap. This improves the transmission efficiency and transmission stability, reduces wear, and prolongs the life of the transmission assembly.

[0003] When the shaft unit at one end of the spline connection and the first fork unit are matched with the specific key teeth and key slots aligned, the installation angle is qualified. When the specific key teeth and key slots are not aligned, the installation angle is unqualified. In actual operation, due to the small distance between the key teeth of the spline, it is difficult to align the specific key teeth and key slots, which easily leads to the key teeth staggering the specific key slots during installation, resulting in installation failure and affecting installation efficiency. Summary of the invention

[0004] In order to solve the problem of improving the installation accuracy of a transmission assembly, the present invention provides a transmission assembly, comprising:

[0005] A first fork unit, the first fork unit comprises a first connection module; the first connection module comprises a first connector, a key slot hole, a first contraction slot, and a locking hole; the key slot hole passes through the first connector; the first contraction slot passes through the first connector; the first contraction slot is connected to the key slot hole; the locking hole passes through the first connector;

[0006] A shaft unit, the shaft unit comprises a first connecting shaft, a second connecting shaft, and a third connecting shaft; the first connecting shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; the first connecting shaft comprises a first spline shaft, a first positioning groove, and a snap-fit ​​hole; the first positioning groove is arranged on the outer peripheral side of the first spline shaft; the snap-fit ​​hole is arranged at an end of the first spline shaft away from the second connecting shaft; a part of the first spline shaft is in the keyway hole;

[0007] The anti-rotation unit comprises a connecting plate, a locking head, and a locking tongue module; the locking head is fixedly connected to one side of the connecting plate; the locking tongue module comprises a locking tongue body and a second shrinkage groove; one end of the locking tongue body is fixedly connected to the connecting plate, and the other end extends in a direction away from the connecting plate; the second shrinkage groove extends from one end of the locking tongue body away from the connecting plate toward a direction close to the connecting plate; the locking head is engaged with the locking hole; part of the locking tongue body is in the first shrinkage groove; part of the locking tongue body is in the first positioning groove;

[0008] a second fork unit, wherein the second fork unit is detachably connected to the third connecting shaft;

[0009] A locking unit, wherein the locking unit passes through the locking hole;

[0010] The transmission assembly also includes a locking state; the locking state includes the locking unit squeezing the two ends of the locking hole, driving the width of the first contraction groove to decrease, and the reduction in the width of the first contraction groove drives the width of the second contraction groove to decrease.

[0011] In some embodiments, the transmission assembly also includes a relaxed state; the relaxed state includes AB<C; wherein A is the width of the first contraction groove away from one end of the key slot hole, B is the width of the lock tongue body away from one end of the locking head, and C is the pitch of adjacent spline teeth on the first spline shaft, and A and B are set correspondingly.

[0012] In some embodiments, the relaxed state also includes AB<0.3*C.

[0013] In some embodiments, the width of the lock tongue body gradually increases along the direction from the locking head to the lock tongue body.

[0014] In some embodiments, a width of the first contraction groove gradually decreases from the first contraction groove to the keyway hole.

[0015] In some embodiments, D:E=0.35~0.5; wherein D is the radial dimension of the second shrinkage groove along the locking head, and E is the radial dimension of the lock tongue body along the locking head.

[0016] In some embodiments, the width of the first positioning groove gradually increases along the direction from the engaging hole to the first positioning groove.

[0017] In some embodiments, F:G=2.1~2.4; wherein F is the radial dimension of the first contraction groove along the keyway hole, and G is the radial dimension of the lock tongue body in the space surrounded by the first contraction groove along the keyway hole.

[0018] In some embodiments, the first connecting shaft also includes a avoidance shaft; the outer diameter of the avoidance shaft is smaller than the outer diameter of the first connecting shaft; the first connecting shaft, the avoidance shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; the outer circumferential surface of the avoidance shaft is adapted to the outer circumferential surface of the locking unit; the avoidance shaft and the locking unit are spaced apart.

[0019] In some embodiments, the first connecting shaft also includes a second spline shaft; the first spline shaft, the avoidance shaft, the second spline shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; and the keyway hole abuts against the second spline shaft.

[0020] In order to solve the problem of improving the installation accuracy of the transmission assembly, the present invention has the following advantages:

[0021] By setting the shaft unit to include the first positioning groove, the first fork unit to include the first contraction groove, and the lock tongue body of the lock tongue module of the anti-rotation unit to cooperate with the first positioning groove and the first contraction groove, the relative position of the shaft unit and the first fork unit can be determined, and the set key teeth and key grooves of the shaft unit and the first fork unit can be matched, thereby ensuring that the installation angle of the first fork unit and the second fork unit meets the requirements. When part of the lock tongue body is located in the first contraction groove, the smaller the gap between the lock tongue body and the first connector, the more accurate the positioning of the first fork unit and the second fork unit, but too small a gap will increase the difficulty of the lock tongue body entering the first contraction groove, and even damage the lock tongue body. By setting the lock tongue body to include the second contraction groove, the lock tongue body has a certain elasticity, which ensures the positioning accuracy and facilitates the lock tongue body to be pressed into the first contraction groove. When the locking unit squeezes the two ends of the locking hole of the first fork unit, the width of the first contraction groove can be driven to decrease, and then the width of the second contraction groove can be driven to decrease, thereby achieving the locking of the first spline shaft of the shaft unit and the key groove hole of the first fork unit, and improving the accuracy and convenience of the installation operation of the transmission assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a transmission assembly according to an embodiment is shown;

[0023] Figure 2 A schematic diagram of an axle unit according to an embodiment is shown;

[0024] Figure 3 A partial schematic diagram of a first fork unit of an embodiment is shown;

[0025] Figure 4 A schematic diagram of an anti-rotation unit according to an embodiment is shown;

[0026] Figure 5 A schematic diagram of an anti-rotation unit in another embodiment is shown;

[0027] Figure 6 A schematic diagram of a transmission assembly of another embodiment is shown.

[0028] Figure markings: 01 first fork unit; 11 first connecting module; 111 first connecting body; 112 keyway hole; 113 first contraction groove; 114 locking hole; 12 first fork ear module; 121 first fork ear body; 122 first ear hole; 02 shaft unit; 21 first connecting shaft; 211 first spline shaft; 212 first positioning groove; 213 engaging hole; 214 avoidance shaft; 215 second spline shaft; 22 second connecting shaft; 23 third connecting shaft; 231 mounting shaft; 232 positioning key; 03 anti-rotation unit; 31 connecting plate; 32 engaging head; 33 locking tongue module; 331 locking tongue body; 332 second contraction groove; 04 second fork unit; 41 second connecting module; 411 second connecting body; 412 mounting hole; 413 second positioning groove; 42 second fork ear module; 421 second fork ear body; 422 second ear hole; 05 locking unit; 51 bolt; 52 nut. DETAILED DESCRIPTION

[0029] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0030] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0031] In this embodiment, the first fork unit 01 and the second fork unit 04 of the transmission assembly can be located at the two ends of the shaft unit 02, respectively, and there are strict requirements for the installation positions of the first fork unit 01 and the second fork unit 04. A spline fit can be used between the first fork unit 01 and the shaft unit 02, and the lock tongue body 331 of the anti-rotation unit 03 can be respectively matched with the first positioning groove 212 of the shaft unit 02 and the first contraction groove 113 of the first fork unit 01, so that specific key teeth and key grooves cooperate with each other, thereby ensuring that the installation positions of the first fork unit 01 and the second fork unit 04 are qualified. However, if the gap between the lock tongue body 331 and the first connecting body 111 is too large, it cannot play a role in accurate positioning, which may easily cause specific key teeth and key grooves to be misaligned, resulting in installation failure; if the gap is too small, it is not conducive to pressing the lock tongue body 331 into the first contraction groove 113, which increases the difficulty of operation and even damages the lock tongue body 331. Therefore, a transmission assembly is proposed. Figure 1As shown, the transmission assembly may include: a first fork unit 01 , an axis unit 02 , an anti-rotation unit 03 , a second fork unit 04 , and a locking unit 05 .

[0032] like Figure 3 As shown, the first fork unit 01 may include a first connection module 11. The first connection module 11 may include a first connector 111, a key slot hole 112, a first contraction groove 113, and a locking hole 114. The key slot hole 112 may penetrate the first connector 111, and the key slot hole 112 may cooperate with the first spline shaft 211 of the shaft unit 02, so as to limit the rotation of the first fork unit 01 around the axis direction of the shaft unit 02. The first contraction groove 113 may penetrate the first connector 111. The first contraction groove 113 may be connected to the key slot hole 112. The locking hole 114 may penetrate the first connector 111. When an external force is applied to the locking hole 114 of the first connector 111, the width of the first contraction groove 113 may be driven to decrease, thereby increasing the pressure between the key slot hole 112 and the first spline shaft 211 of the shaft unit 02, so that the connection between the first fork unit 01 and the shaft unit 02 is more tightened.

[0033] like Figure 2 As shown, the shaft unit 02 may include a first connecting shaft 21, a second connecting shaft 22, and a third connecting shaft 23. The first connecting shaft 21, the second connecting shaft 22, and the third connecting shaft 23 may be fixedly connected in sequence. The first connecting shaft 21 may cooperate with the first fork unit 01, and the third connecting shaft 23 may cooperate with the second fork unit 04. The first connecting shaft 21 may include a first spline shaft 211, a first positioning groove 212, and a snap-fit ​​hole 213. The first positioning groove 212 may be arranged on the outer peripheral side of the first spline shaft 211 and may be arranged along the axial direction of the first connecting shaft 21. The snap-fit ​​hole 213 may be arranged at one end of the first spline shaft 211 away from the second connecting shaft 22, and may be arranged along the center of the end face of the first spline shaft 211. Part of the circumferential length of the first spline shaft 211 may be within the keyway hole 112, and the remaining circumferential length may correspond to the position of the first contraction groove 113.

[0034] like Figure 4As shown, the anti-rotation unit 03 may include a connecting plate 31, a snap-fit ​​head 32, and a lock tongue module 33. The snap-fit ​​head 32 may be fixedly connected to one side of the connecting plate 31 as a whole. The lock tongue module 33 may include a lock tongue body 331 and a second contraction groove 332. One end of the lock tongue body 331 may be fixedly connected to the connecting plate 31 as a whole, and the other end may extend in a direction away from the connecting plate 31. The second contraction groove 332 may extend from one end of the lock tongue body 331 away from the connecting plate 31 toward a direction close to the connecting plate 31, and the width of the second contraction groove 332 may change with the pressure change on both sides of the lock tongue body 331. The snap-fit ​​head 32 may be snap-fitted and connected to the snap-fit ​​hole 213. Part of the lock tongue body 331 may be in the first contraction groove 113. Part of the lock tongue body 331 may be in the first positioning groove 212. When the locking head 32 cooperates with the locking hole 213 and part of the lock tongue body 331 cooperates with the first positioning groove 212, the positions of the anti-rotation unit 03 and the first connecting shaft 21 can be relatively determined; at the same time, part of the lock tongue body 331 can be located in the first contraction groove 113, so that the positions of the anti-rotation unit 03 and the first fork unit 01 are relatively determined, thereby achieving accurate positioning between the first fork unit 01 and the shaft unit 02.

[0035] like Figure 1 , Figure 2 As shown, the second fork unit 04 can be detachably connected to the third connecting shaft 23. The second fork unit 04 and the shaft unit 02 can have a relatively determined position, and when the first fork unit 01 and the shaft unit 02 are accurately positioned, the first fork unit 01 and the second fork unit 04 can be accurately positioned.

[0036] like Figure 1 , Figure 3 As shown, the locking unit 05 can pass through the locking hole 114 , and applying pressure to the locking unit 05 can drive the distance of the first contraction groove 113 to decrease, thereby making the connection between the first spline shaft 211 and the spline groove more secure.

[0037] The transmission assembly may also include a locking state. The locking state may include the locking unit 05 squeezing the two ends of the locking hole 114, driving the width of the first contraction groove 113 to decrease, and the reduction in the width of the first contraction groove 113 may further drive the width of the second contraction groove 332 to decrease. When part of the lock tongue body 331 is located in the first contraction groove 113, the smaller the gap between the lock tongue body 331 and the first connector 111, the more accurate the positioning of the first fork unit 01 and the second fork unit 04, but too small a gap may increase the difficulty of the lock tongue body 331 entering the first contraction groove 113, and even damage the lock tongue body 331. By setting the lock tongue body 331 to include the second contraction groove 332, the lock tongue body 331 has a certain elasticity, which ensures the positioning accuracy while facilitating the lock tongue body 331 to be pressed into the first contraction groove 113. When the locking unit 05 squeezes the two ends of the locking hole 114 of the first connecting body 111, it can drive the width of the first contraction groove 113 to decrease, and then drive the width of the second contraction groove 332 to decrease, thereby achieving the locking of the first spline shaft 211 of the shaft unit 02 and the keyway hole 112 of the first fork unit 01, thereby improving the accuracy and convenience of the installation operation of the transmission assembly.

[0038] In other embodiments, Figure 3 As shown, the first fork unit 01 may also include two first fork ear modules 12, and the first fork ear module 12 may include a first fork ear body 121 and a first ear hole 122. The first fork ear body 121 may be fixedly connected to the first connecting body 111, and the first ear hole 122 may be provided on the first fork ear body 121. Figure 2 As shown, the third connecting shaft 23 may include a mounting shaft 231 and a positioning key 232. Figure 6 As shown, the second fork unit 04 may include a second connection module 41 and two second fork ear modules 42. Figure 1 As shown, the second connection module 41 may include a second connection body 411, a mounting hole 412, and a second positioning groove 413. The mounting shaft 231 may cooperate with the mounting hole 412, and the positioning key 232 may cooperate with the second positioning groove 413, so that the positions of the second connection body 411 and the third connection shaft 23 can be relatively fixed, that is, the positions of the second fork unit 04 and the shaft unit 02 are relatively determined. The second fork ear module 42 may include a second fork ear body 421 and a second ear hole 422. The second fork ear body 421 may be fixedly connected to the second connection body 411, and the second ear hole 422 may be provided on the second fork ear body 421. The first fork ear module 12 and the second fork ear module 42 may be used for connecting active parts or driven parts.

[0039] In this embodiment, the transmission assembly may also include a relaxed state. The relaxed state refers to that part of the lock tongue body 331 is located in the first positioning groove 212 of the first connecting shaft 21, part of the lock tongue body 331 is located in the first contraction groove 113 of the first connecting module 11, and the locking unit 05 does not apply force to the first connecting body 111. The relaxed state may include AB<C. Among them, A can be the width of the end of the first contraction groove 113 away from the keyway hole 112, B can be the width of the end of the lock tongue body 331 away from the locking head 32, and C can be the pitch of adjacent spline teeth on the first spline shaft 211. Both A and B can be in a plane tangent to the circumferential surface of the first spline shaft 211. The values ​​of A and B can be set accordingly without limiting the specific size. The value of AB can measure the sum of the gaps between the first connector 111 and the two sides of the lock tongue body 331 when part of the lock tongue body 331 is located in the first contraction groove 113. The smaller the gap, the more conducive it is to match the key slot hole 112 with the specific key teeth and key slots of the first spline shaft 211; if the gap is too large, it cannot ensure that the specific key teeth match the specific key slots, which will cause the installation angle of the first fork unit 01 and the second fork unit 04 to be unqualified and the installation fails. Therefore, the value of AB (that is, the gap between the first connector 111 and the lock tongue body 331) can be controlled to be smaller than C (the pitch of adjacent spline teeth on the first spline shaft 211), so that the specific key teeth of the key slot hole 112 and the first spline shaft 211 in the relaxed state always match the specific key slots, which can ensure that the installation angle of the first fork unit 01 and the second fork unit 04 is qualified.

[0040] In this embodiment, the relaxed state may also include AB<0.3*C. That is, in the relaxed state, the sum of the gaps on both sides of the first connector 111 and the lock tongue body 331 is less than 0.3 times the pitch of the adjacent spline teeth on the first spline shaft 211. Since errors are prone to occur in the processing engineering, the sum of the gaps on both sides of the first connector 111 and the lock tongue body 331 may be large, which may lead to the meshing misalignment of the keyway hole 112 and the specific key teeth and keyways of the first spline shaft 211, resulting in unqualified installation. Therefore, the gaps on both sides of the first connector 111 and the lock tongue body 331 can be reduced as much as possible while facilitating assembly, thereby minimizing the occurrence of meshing misalignment of specific key teeth and keyways.

[0041] In this embodiment, if Figure 5 As shown, the width of the lock tongue body 331 can be gradually increased along the direction from the locking head 32 to the lock tongue body 331. The portion of the lock tongue body 331 away from the locking head 32 needs to be provided with the second contraction groove 332, so increasing the width of the portion of the lock tongue body 331 away from the locking head 32 can ensure that the lock tongue body 331 still has sufficient strength after the second contraction groove 332 is provided; and the portion of the lock tongue body 331 close to the locking head 32 has a smaller width, which is conducive to the cooperation between the lock tongue body 331 and the first positioning groove 212.

[0042] In this embodiment, the width of the first contraction groove 113 can be gradually reduced along the direction from the first contraction groove 113 to the key slot hole 112. By setting the first contraction groove 113 to have a smaller width on the side close to the key slot hole 112, the length of the first contraction groove 113 in the circumferential direction of the key slot hole 112 is smaller, which facilitates the key slot hole 112 to open more spline grooves of set specifications, thereby enhancing the connection strength between the first connection module 11 and the first connection shaft 21.

[0043] In this embodiment, D:E=0.35~0.5. D can be the dimension of the second contraction groove 332 from the axis of the engaging head 32 to the lock tongue body 331, and E can be the dimension of the lock tongue body 331 from the axis of the engaging head 32 to the lock tongue body 331. The portion of the lock tongue body 331 that matches the first positioning groove 212 is set to be solid, so as to ensure the strength; the portion of the lock tongue body 331 that matches the first contraction groove 113 is set to the second contraction groove 332, so that the portion of the lock tongue body 331 that matches the first contraction groove 113 has a certain elasticity in the width direction, so as to facilitate the matching of the lock tongue body 331 and the first contraction groove 113 to complete the positioning.

[0044] In this embodiment, the width of the first positioning groove 212 of the first connecting shaft 21 can gradually increase along the direction from the locking hole 213 to the first positioning groove 212, so as to adapt to the shape of the lock tongue body 331, so that the abutment area of ​​the lock tongue body 331 is larger when it cooperates with the first positioning groove 212, avoiding shaking and ensuring accurate positioning.

[0045] In this embodiment, F:G=2.1~2.4. Among them, F can be the size of the first contraction groove 113 along the radial direction of the key slot hole 112 (from the axis of the key slot hole 112 to the direction of the first contraction groove 113), and G can be the size of the lock tongue body 331 in the space surrounded by the first contraction groove 113 along the radial direction of the key slot hole 112 (from the axis of the key slot hole 112 to the direction of the first contraction groove 113). The value of F:G can characterize the relationship between the depth of the first contraction groove 113 and the length of the lock tongue body 331 in the first contraction groove 113. By making the lock tongue body 331 absent in part of the first contraction groove 113, the first contraction groove 113 is more easily deformed. The lock tongue body 331 is located in the area of ​​the first contraction groove 113 close to the key slot hole 112. When locking, it compresses both sides of the locking hole 114, drives the part of the first contraction groove 113 away from the lock tongue body 331 to deform first, and then drives the second contraction groove 332 of the lock tongue body 331 to deform, which is convenient for locking and increases the stability of locking to avoid loosening.

[0046] In this embodiment, if Figure 2As shown, the first connecting shaft 21 may further include an avoidance shaft 214. The outer diameter of the avoidance shaft 214 may be smaller than the outer diameter of the first connecting shaft 21. The first connecting shaft 21, the avoidance shaft 214, the second connecting shaft 22, and the third connecting shaft 23 may be fixedly connected in sequence. The outer circumferential surface of the avoidance shaft 214 may be adapted to the outer circumferential surface of the locking unit 05. The avoidance shaft 214 may be spaced apart from the locking unit 05. In the locked state, the locking unit 05 may pass through the space avoided by the avoidance shaft 214. By providing the avoidance shaft 214, the structure of the transmission assembly can be made more compact, and the locking unit 05 can be made closer to the first connecting shaft 21, thereby enhancing the locking effect of the locking unit 05 and making the first fork unit 01 more firmly connected to the shaft unit 02.

[0047] In other embodiments, Figure 1 As shown, the locking unit 05 may include a bolt 51 and a nut 52. The bolt 51 may pass through the locking hole 114 and pass beside the avoidance shaft 214. By tightening the bolt 51 and the nut 52, the first contraction groove 113 may be driven to be reduced, thereby achieving the tightening of the connection between the first fork unit 01 and the shaft unit 02. The avoidance shaft 214 may avoid the position of the bolt 51, so that the bolt 51 is closer to the first connecting shaft 21, thereby enhancing the locking effect of the locking unit 05.

[0048] In this embodiment, if Figure 2 As shown, the first connecting shaft 21 may also include a second spline shaft 215. The first spline shaft 211, the avoidance shaft 214, the second spline shaft 215, the second connecting shaft 22, and the third connecting shaft 23 may be fixedly connected in sequence. The keyway hole 112 may abut against the second spline shaft 215. By providing the second spline shaft 215, the contact area of ​​the spline is increased, so that the connection strength between the first fork unit 01 and the shaft unit 02 is higher and more stable.

[0049] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A transmission assembly, characterized in that: The transmission assembly comprises: A first fork unit, the first fork unit comprises a first connection module; the first connection module comprises a first connector, a key slot hole, a first contraction slot, and a locking hole; the key slot hole passes through the first connector; the first contraction slot passes through the first connector; the first contraction slot is connected to the key slot hole; the locking hole passes through the first connector; A shaft unit, the shaft unit comprises a first connecting shaft, a second connecting shaft, and a third connecting shaft; the first connecting shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; the first connecting shaft comprises a first spline shaft, a first positioning groove, and a snap-fit ​​hole; the first positioning groove is arranged on the outer peripheral side of the first spline shaft; the snap-fit ​​hole is arranged at an end of the first spline shaft away from the second connecting shaft; a part of the first spline shaft is in the keyway hole; The anti-rotation unit comprises a connecting plate, a locking head, and a locking tongue module; the locking head is fixedly connected to one side of the connecting plate; the locking tongue module comprises a locking tongue body and a second shrinkage groove; one end of the locking tongue body is fixedly connected to the connecting plate, and the other end extends in a direction away from the connecting plate; the second shrinkage groove extends from one end of the locking tongue body away from the connecting plate toward a direction close to the connecting plate; the locking head is engaged with the locking hole; part of the locking tongue body is in the first shrinkage groove; part of the locking tongue body is in the first positioning groove; a second fork unit, wherein the second fork unit is detachably connected to the third connecting shaft; A locking unit, wherein the locking unit passes through the locking hole; The transmission assembly also includes a locking state; the locking state includes the locking unit squeezing the two ends of the locking hole, driving the width of the first contraction groove to decrease, and the reduction in the width of the first contraction groove drives the width of the second contraction groove to decrease.

2. A transmission assembly according to claim 1, characterized in that: The transmission assembly also includes a relaxed state; the relaxed state includes AB<C; wherein A is the width of the first contraction groove away from one end of the key slot hole, B is the width of the lock tongue body away from one end of the locking head, and C is the pitch of adjacent spline teeth on the first spline shaft, and A and B are set correspondingly.

3. A transmission assembly according to claim 2, characterized in that: The relaxation state also includes AB<0.3*C.

4. A transmission assembly according to claim 1, characterized in that: The width of the lock tongue body gradually increases along the direction from the engaging head to the lock tongue body.

5. A transmission assembly according to claim 1, characterized in that: The width of the first contraction groove gradually decreases along the direction from the first contraction groove to the key slot hole.

6. A transmission assembly according to claim 1, characterized in that: D: E=0.35~0.5; wherein D is the radial dimension of the second shrinkage groove along the locking head, and E is the radial dimension of the lock tongue body along the locking head.

7. A transmission assembly according to claim 1, characterized in that: The width of the first positioning groove gradually increases along the direction from the engaging hole to the first positioning groove.

8. A transmission assembly according to claim 1, characterized in that: F: G=2.1~2.4; wherein F is the radial dimension of the first contraction groove along the keyway hole, and G is the radial dimension of the lock tongue body in the space surrounded by the first contraction groove along the keyway hole.

9. A transmission assembly according to claim 1, characterized in that: The first connecting shaft also includes an avoidance shaft; the outer diameter of the avoidance shaft is smaller than the outer diameter of the first connecting shaft; the first connecting shaft, the avoidance shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; the outer circumferential surface of the avoidance shaft is adapted to the outer circumferential surface of the locking unit; the avoidance shaft and the locking unit are spaced apart.

10. A transmission assembly according to claim 9, characterized in that: The first connecting shaft also includes a second spline shaft; the first spline shaft, the avoidance shaft, the second spline shaft, the second connecting shaft, and the third connecting shaft are fixedly connected in sequence; and the keyway hole abuts against the second spline shaft.

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