A compound slider constant velocity universal joint and a universal joint transmission device

Abstract

The present invention relates to the technical field of constant velocity universal joints, and in particular to a composite slider type constant velocity universal joint and a universal joint transmission device. The composite slider type constant velocity universal joint comprises a spline-like shaft, an axial limit end cover assembly, a composite slider assembly and a housing. The outer circumferential surface of the spline-like shaft is surrounded by a plurality of spline-like protrusions, and the inner circumferential surface of the housing is surrounded by a plurality of spline-like grooves that match the spline-like protrusions and the composite slider assembly. The spline-like shaft is connected to the housing through the composite slider assembly, and the axial limit end cover assembly is sealed in the annular gap between the spline-like shaft and the housing. The driving shaft transmits power to the housing through the composite slider assembly through any type of coupling structure; the composite slider assembly slides in the spline-like protrusion of the spline-like shaft and the spline-like groove of the housing, and realizes spherical low pair motion through the spherical pair of the composite slider assembly to adapt to the change of the angle between the shafts, so as to realize the multi-point load-balanced constant speed transmission of torque from the spline-like shaft to the housing.

Description

Technical Field

[0001] The present invention relates to the technical field of constant velocity universal joints, and in particular to a composite slider constant velocity universal joint and a universal joint transmission device. Background Art

[0002] A universal joint, namely a universal joint head, is a mechanical part for realizing variable-angle power transmission, and is used for positions where the direction of the transmission axis needs to be changed. It is the "joint" part of the universal transmission device. A constant velocity universal joint is a device that connects two shafts with an included angle or a changing relative position between the shafts and transmits power at the same angular velocity between the two shafts. It can overcome the non-constant velocity problem existing in ordinary cross-axis universal joints.

[0003] In the prior art, a universal joint transmission device includes a universal joint, a driving shaft and a driven shaft which are fixedly connected to the universal joint respectively. During operation, power is transmitted from the driving shaft to the universal joint, and then from the universal joint to the driven shaft. During the power transmission process, the universal joint adapts to the included angle between the driving shaft and the driven shaft and the change of the relative position to realize the power transmission between the driving shaft and the driven shaft. Universal joints include cross-axis universal joints, three-pin shaft universal joints, ball-and-fork universal joints, ball-and-cage universal joints, etc. At present, traditional variable-angle power transmission mechanisms have their own applicable ranges. For example, cross-axis universal joints are suitable for medium and low speeds and large torques, but they are large in size, have non-constant velocity transmission, and are difficult to seal the joints; ball hinge universal joints are suitable for high-power transmission and can achieve constant velocity transmission, but they will cause the ball hinge to self-lock and cause damage under large torques. The above variable-angle power transmission mechanisms have problems such as poor use effects and inadaptability in application scenarios with space volume limitations, sealing limitations, and large torque rotation limitations, such as downhole power mechanisms in oil wells.

[0004] Therefore, for the application scenario of low-speed large-torque variable-angle constant velocity transmission, the present invention proposes a novel composite slider constant velocity universal joint and a universal joint transmission device. Summary of the Invention

[0005] The purpose of the present invention is to provide a composite slider constant velocity universal joint, which is suitable for the application scenario of low-speed large-torque variable-angle constant velocity transmission.

[0006] In a first aspect, the present invention provides a composite slider constant velocity universal joint, including a spline-like shaft, an axial limiting end cover assembly, a composite slider assembly and a housing. A plurality of spline-like protrusions are circumferentially arranged on the outer peripheral surface of the spline-like shaft, and a plurality of spline-like grooves adapted to the spline-like protrusions and the composite slider assembly are circumferentially arranged on the inner peripheral surface of the housing. The spline-like shaft is in transmission connection with the housing through the composite slider assembly, and the axial limiting end cover assembly is hermetically arranged in the annular gap between the spline-like shaft and the housing.

[0007] Preferably, as for the present technical solution, the composite slider assembly includes multiple groups of slider groups and multiple groups of gap compensation springs. Each slider group includes a first slider and a second slider. The first slider is arranged in the limit groove on the spline-like protrusion, and one side of the first slider is in elastic contact with and mutually supported by another first slider in the adjacent slider group through the gap compensation spring. The other side of the first slider is connected to one side of the second slider in a spherical pair, and the other side of the second slider is connected to the inner side wall of the spline-like groove in a semi-open cylindrical sleeve pair.

[0008] Preferably, as for the present technical solution, two limit grooves are symmetrically and parallelly formed on each spline-like protrusion, and one or more through holes are formed on the side wall between the two limit grooves. The gap compensation springs are correspondingly arranged in the through holes, and both ends of the gap compensation springs respectively abut against one side of two first sliders in the adjacent slider groups.

[0009] Preferably, as for the present technical solution, the sides of the first slider and the second slider that are connected in a spherical pair are respectively a concave surface and a convex surface that cooperate with each other.

[0010] Preferably, as for the present technical solution, a rolling ball is arranged between the first slider and the second slider, and the surfaces of the first slider and the second slider that are in contact with the rolling ball are both concave surfaces. The first slider and the second slider are both connected to the rolling ball in a spherical pair.

[0011] Preferably, as for the present technical solution, the axial limit end cover assembly includes a snap ring, a limit end cover, and an end cover lock block. The snap ring, the limit end cover, and the end cover lock block are sequentially sleeved on the spline-like shaft and located in the annular gap between the spline-like shaft and the housing. Among them, an external thread is arranged on the outer side of the limit end cover, and internal threads are arranged inside the housing and the end cover lock block. The housing and the end cover lock block are respectively threadedly connected to the limit end cover.

[0012] Preferably, as for the present technical solution, a seal is further included, and the seal is arranged between the limit end cover and the end cover lock block.

[0013] Preferably, as for the present technical solution, the seal includes a leather cup gasket.

[0014] Preferably, as for the present technical solution, a spherical pair base is detachably arranged inside the housing, and a spherical pair structure adapted to the spherical pair base is arranged at one end of the spline-like shaft close to the housing.

[0015] In a second aspect, the present invention further discloses a universal joint transmission device provided with the above-mentioned composite slider type constant velocity universal joint, which should also fall within the protection scope of the present invention. Moreover, the universal joint transmission device has the same advantages as the above-mentioned composite slider type universal joint over the prior art.

[0016] Compared with the prior art, the composite slider type constant velocity universal joint of the present invention has at least the following technical effects:

[0017] 1. The composite slider type constant velocity universal joint of the present invention comprises a spline-like shaft, an axial limit end cover assembly, a composite slider assembly and a shell, wherein a plurality of spline-like protrusions are arranged around the outer circumference of the spline-like shaft, and a plurality of spline-like grooves compatible with the spline-like protrusions and the composite slider assembly are arranged around the inner circumference of the shell. When the composite slider type constant velocity universal joint of the present invention is applied to a universal joint transmission device, the driving shaft is inserted into the spline hole of the spline-like shaft, and the driving shaft transmits power to the spline-like shaft through any type of coupling structure, and the spline-like shaft transmits power to the shell through the composite slider assembly, and then directly transmits power to the driven shaft; when the shaft angle between the driving shaft and the driven shaft changes, the composite slider assembly in the composite slider type constant velocity universal joint slides in the spline-like protrusion of the spline-like shaft and the spline-like groove of the shell, and adapts to the change of the shaft angle between the driving shaft and the transmission shaft through the spherical lower pair of the composite slider component, so as to realize multi-point load-balanced constant-speed transmission of torque from the spline-like shaft to the shell;

[0018] 2. The composite slider type constant velocity universal joint of the present invention realizes the spatial angle-changing function and the axial load-bearing function of fixing the connection point position through the ball joint structure composed of a spline-like shaft and a housing, an axial limit end cover assembly and a composite slider assembly. The composite slider assembly is a plurality of groups of sliders that are ball-milled with each other, and the corresponding sides of the spherical surfaces of the plurality of groups of parallel sliders constitute a low pair with a total degree of freedom of 1. The composite slider assembly can meet the requirements of the multi-point flexible transmission mechanism for the degree of freedom. When the angle between the active shaft and the driven shaft changes, the composite slider assembly can move the center of the spherical pair outward to achieve contact with a large-radius spherical surface, thereby achieving a high pair position at the flexible point position during large torque transmission. The requirement of low stress of the high pair can be ensured by adjusting the spherical radius, so that it is suitable for low-speed, large-torque, variable-angle, constant-velocity transmission applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1Schematic diagram of the design principle of the composite slider constant velocity universal joint of the present invention;

[0021] Figure 2 Exploded view of the structure of the composite slider constant velocity universal joint of the present invention;

[0022] Figure 3 Axial sectional view of the composite slider constant velocity universal joint of the present invention;

[0023] Figure 4 Flexible joint sectional view of the composite slider constant velocity universal joint of the present invention;

[0024] Figure 5 Schematic diagram of the connection between the axial limit end cover assembly and the spline-like shaft of the present invention Figure 1 ;

[0025] Figure 6 Schematic diagram of the connection between the axial limit end cover assembly and the spline-like shaft of the present invention Figure 2 ;

[0026] Figure 7 Schematic diagram of the composite slider assembly of the present invention Figure 1 ;

[0027] Figure 8 Schematic diagram of the composite slider assembly of the present invention Figure 2 。

[0028] Explanation of reference numerals:

[0029] 1: Spline-like shaft; 2: Housing; 3: Spline-like protrusion; 4: Spline-like groove; 5: Slider group; 6: Clearance compensation spring; 7: First slider; 8: Second slider; 9: Limit groove; 10: Through hole; 11: Ball; 12: Snap ring; 13: Limit end cover; 14: End cover lock block; 15: Seal; 16: Spherical pair base; 17: Input shaft; 18: Output shaft; 19: Input shaft fixed node; 20: Output shaft fixed node; 21: Flexible transmission node. Detailed implementation manners

[0030] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0032] 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] As Figure 1-8 shown, this embodiment provides a compound slider constant velocity universal joint, which includes a spline-like shaft 1, an axial limit end cover assembly, 5 pieces of compound slider groups, and a housing 2. A plurality of spline-like protrusions 3 are circumferentially arranged on the outer peripheral surface of the spline-like shaft 1. A plurality of spline-like grooves 4 adapted to the spline-like protrusions 3 and the compound slider assembly are circumferentially arranged on the inner peripheral surface of the housing 2. The spline-like shaft 1 is drivingly connected to the housing 2 through the compound slider assembly. The axial limit end cover assembly is hermetically arranged in the annular gap between the spline-like shaft 1 and the housing 2.

[0034] Figure 1 is the design schematic diagram of the compound slider constant velocity universal joint of this embodiment. The input shaft 17 and the output shaft 18 respectively output from the input shaft fixed node 19 and the output shaft fixed node 20 intersect at the flexible transmission node 21. According to the principle of calculating the degree of freedom of the kinematic chain, multiple groups of slider groups 5 with spherical mating with each other are designed for this universal joint. The spherical corresponding sides of multiple groups of parallel sliders form a lower pair with a total degree of freedom of 1. The compound slider assembly with this structure just meets the Figure 1 degree of freedom requirement of the position of the flexible transmission node 21 in , and thus can meet the degree of freedom requirement of the multi-point flexible transmission mechanism.

[0035] When applying the composite slider constant velocity universal joint of this embodiment to a universal joint transmission device, the driving shaft transmits power to the spline-like shaft 1 through any type of coupling structure. The spline-like shaft 1 transmits the power to the housing 2 through the composite slider assembly, and then directly transmits the power to the driven shaft. When the axial angle between the driving shaft and the driven shaft changes, the composite slider assembly in the composite slider constant velocity universal joint can slide in the spline-like protrusions 3 of the spline-like shaft 1 and the spline-like grooves 4 of the housing 2, and realize spherical lower pair motion through the spherical pair of the composite slider assembly to adapt to the change of the axial angle between the driving shaft and the driven shaft, thereby realizing the multi-point equal load constant velocity transmission of the composite slider constant velocity universal joint. The composite slider constant velocity universal joint of the present invention can achieve equal load constant velocity torque transmission with a contact point number greater than four at the same level as that of the ball cage universal joint.

[0036] On the basis of the above technical solution, the composite slider assembly specifically includes multiple groups of slider groups 5 and multiple groups of clearance compensation springs 6. Each group of the slider groups 5 includes a first slider 7 and a second slider 8. The first slider 7 is arranged in the limiting groove 9 on the spline-like protrusion, and one side of the first slider 7 is in elastic contact and mutual support with another first slider 7 in the adjacent slider group 5 through the clearance compensation spring 6. The other side of the first slider 7 is connected to one side of the second slider 8 in a spherical pair, and the other side of the second slider 8 is connected to the inner side wall of the spline-like groove 4 in a semi-open cylindrical sleeve pair.

[0037] The connection mode between the first slider 7 and the second slider 8 in each group of slider groups 5 is a spherical pair lower pair. The composite slider assembly can adapt to the change of the angle between the spline-like shaft 1 and the housing 2 and automatically distribute the circumferential force evenly to each slider group 5. The slider group 5 can move the center of the sphere of the spherical pair outward to realize the contact of a large-radius sphere, and further ensure that the high pair position at the flexible point during large-torque transmission can meet the requirement of low stress of the high pair by adjusting the spherical radius, so as to be applicable to the application occasions of low-speed large-torque variable-angle constant velocity transmission. The setting of the clearance compensation spring 6 further ensures the stability of the composite slider assembly during large-torque variable-angle transmission, can automatically compensate for the clearance caused by processing accuracy and design accuracy, and ensures that the non-load side can maintain the pre-tightening pressure during transmission.

[0038] On the basis of the above technical solution, further, two limiting grooves 9 are symmetrically and parallelly formed on each of the spline-like protrusions 3 to respectively accommodate two first sliders 7 in the adjacent slider groups 5. One or more through holes 10 are formed in the side wall between the two limiting grooves 9. The clearance compensation spring 6 is correspondingly arranged in the through hole 10, and two ends of the clearance compensation spring 6 respectively abut against one side of two first sliders 7 in the adjacent slider groups 5. That is, the adjacent two first sliders 7 are elastically connected through the clearance compensation spring 6. One side of the first slider 7 away from the clearance compensation spring 6 is in spherical pair connection with the second slider 8, and one side of the second slider 8 away from the first slider 7 abuts against the spline-like groove 4 arranged on the inner peripheral surface of the housing 2. That is, the spline-like groove 4 inside the housing 2 can exactly accommodate two adjacent slider groups 5 and the spline-like protrusions 3 for fixing the two adjacent slider groups 5.

[0039] In a specific embodiment of the present invention, the spherical pair connection between the first slider 7 and the second slider 8 specifically means that the sides of the first slider 7 and the second slider 8 in contact with each other are respectively a concave surface and a convex surface that cooperate with each other. When the axial angle between the driving shaft and the driven shaft is relatively large, the composite slider assembly can move the center of the spherical pair outward to achieve contact with a large-radius spherical surface, so that the high pair position at the flexible point during large-torque transmission can meet the requirement of low stress of the high pair by adjusting the spherical radius.

[0040] In another specific embodiment of the present invention, a rolling ball 11 is arranged between the first slider 7 and the second slider 8, and the surfaces of the first slider 7 and the second slider 8 in contact with the rolling ball 11 are both concave surfaces. The first slider 7 and the second slider 8 are both in spherical pair connection with the rolling ball 11. This structure changes the ball and arc-shaped raceway structure of the traditional constant velocity joint into a spherical contact pair. Therefore, although this structure does not move the center of the spherical pair outward to increase the radius and reduce the contact stress, this structure can ensure the rolling property of the rolling ball 11 under large loads. Therefore, this structure not only solves the problem of constant velocity transmission with variable angle under low speed and large torque, but also solves the problem that the rolling ball 11 of the traditional constant velocity joint does not roll under large torque.

[0041] It should also be noted here that the composite slider assembly of the present invention includes but is not limited to the above two forms, and other double-slider structures that meet the Figure 1 degree-of-freedom requirements of the flexible transmission node position can also be selected.

[0042] On the basis of the above technical solution, in order to further realize the axial position limitation of the spline-like shaft 1 and the housing 2, an axial limit end cover assembly with a concave spherical structure and an inner diameter smaller than the maximum diameter of the spline-like shaft 1 is connected to the open end of the housing 2. However, the specific composition and structure of the axial limit end cover assembly of the present invention are not strictly limited, and axial limit end cover assemblies with different structures and compositions can be selected according to the structures of different spline-like shafts 1.

[0043] As Figure 5 shown, in an embodiment of the present invention, an integral limit end cover is selected, and the integral limit end cover can be directly slid into the end of the spline-like shaft 1 far from the spline-like protrusion 3.

[0044] As Figure 6 shown, in another embodiment of the present invention, a split limit end cover is selected. The split limit end covers are respectively slid into the spline-like shaft 1 from one end close to the spline-like protrusion 3 in sequence. Specifically, the axial limit end cover assembly includes a snap ring 12, a limit end cover 13 and an end cover lock block 14. The spline structures of the snap ring 12 and the limit end cover 13 have the following characteristics: the number of splines is equal to the number of splines of the spline-like shaft; the spline widths of the snap ring 12 and the limit end cover 13 are equal to achieve complementarity; the spline widths of the snap ring 12 and the limit end cover 13 are smaller than the width between the spline-like protrusions of the spline-like shaft, so that the snap ring 12 and the limit end cover 13 can be slid into by changing the angular relative position relative to the spline-like shaft. The snap ring 12, the limit end cover 13 and the end cover lock block 14 are sequentially sleeved on the spline-like shaft 1 and located at the connection between the spline-like shaft 1 and the housing 2. Among them, an external thread is provided on the outer side of the limit end cover 13, and internal threads are provided inside the housing 2 and the end cover lock block 14. The housing 2 and the end cover lock block 14 are respectively threadedly connected to the limit end cover 13.

[0045] Whether it is an integral limit end cover or a split limit end cover, finally, they are fixedly connected to the housing 2 through an end cover lock, and further cooperate with the housing 2 to limit the axial movement function of the spline-like shaft 1, which can not only realize the position limitation of the spline-like shaft 1, but also meet the bearing requirements of the axial force of the universal joint in some occasions, and improve the stability of the universal joint transmission device when transmitting power.

[0046] On the basis of the above technical solution, in order to further realize the sealing between the spline-like shaft 1 and the housing 2 and prevent dust, impurities, etc. in the external environment from entering the universal joint. The composite slider constant velocity universal joint in this embodiment further includes a seal 15. The large diameter end of the seal 15 is arranged between the limit end cover 13 and the end cover lock block 14, and its small diameter end is tightly sealed on the smooth circumferential surface of the spline, 1. And the seal 15 includes but is not limited to a leather cup gasket.

[0047] When a leather cup gasket is selected for sealing, the end cover lock block 14 is fixed and sealed on the large-mouth side of the leather cup gasket, and the small-mouth side of the leather cup gasket is closely attached and sealed on the circumferential surface of the spline-like shaft 1.

[0048] On the basis of the above technical solution, further preferably, the housing 2 is a housing 2 containing a spherical pair, or a housing 2 with a spherical pair base 16 detachably arranged inside, and a spherical pair structure adapted to the spherical pair base 16 is provided at one end of the spline-like shaft 1 close to the housing 2 to reduce the wear of the spline-like shaft 1 and the housing 2 during power transmission.

[0049] The embodiment of the present invention also provides a universal joint transmission device provided with the above composite slider constant velocity universal joint. The universal joint transmission device has the same advantages as the above composite slider constant velocity universal joint compared with the prior art, which will not be elaborated here.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite slider constant velocity universal joint, characterized in that, It includes a spline-like shaft (1), an axial limiting end cover assembly, a composite slider assembly, and a housing (2). On the outer peripheral surface of the spline-like shaft (1), a plurality of spline-like protrusions (3) are circumferentially arranged. On the inner peripheral surface of the housing (2), a plurality of spline-like grooves (4) adapted to the spline-like protrusions (3) and the composite slider assembly are circumferentially arranged. The spline-like shaft (1) is drivingly connected to the housing (2) through the composite slider assembly. The axial limiting end cover assembly is hermetically arranged in the annular gap between the spline-like shaft (1) and the housing (2). The composite slider assembly includes multiple groups of slider groups (5) and multiple groups of gap compensation springs (6). Each group of the slider groups (5) includes a first slider (7) and a second slider (8). The first slider (7) is arranged in a limiting groove (9) on the spline-like protrusion (3). One side of the first slider (7) is elastically contacted and mutually supported with another first slider (7) in the adjacent slider group (5) through the gap compensation spring (6). The other side of the first slider (7) is connected to one side of the second slider (8) in a spherical pair. The other side of the second slider (8) is connected to the inner side wall of the spline-like groove (4) in a semi-open cylindrical sleeve pair.

2. The composite slider constant velocity universal joint according to claim 1, characterized in that On each spline-like protrusion (3), two limiting grooves (9) are symmetrically and parallelly opened. One or more through holes (10) are opened on the side wall between the two limiting grooves (9). The gap compensation spring (6) is correspondingly arranged in the through hole (10), and both ends of the gap compensation spring (6) respectively abut against one side of two first sliders (7) in the adjacent slider group (5).

3. The composite slider constant velocity universal joint according to claim 1, characterized in that, The sides of the first slider (7) and the second slider (8) that are connected in a spherical pair are respectively a concave surface and a convex surface that cooperate with each other.

4. The composite slider constant velocity universal joint according to claim 1, characterized in that A rolling ball (11) is arranged between the first slider (7) and the second slider (8). The surfaces of the first slider (7) and the second slider (8) that are in contact with the rolling ball (11) are both concave surfaces. The first slider (7) and the second slider (8) are both connected to the rolling ball (11) in a spherical pair.

5. The composite slider constant velocity universal joint according to claim 1, characterized in that, The axial limiting end cover assembly includes a snap ring (12), a limiting end cover (13), and an end cover lock block (14). The snap ring (12), the limiting end cover (13), and the end cover lock block (14) are sequentially sleeved on the spline-like shaft (1) and are located in the annular gap between the spline-like shaft (1) and the housing (2). Among them, an external thread is provided on the outer side of the limiting end cover (13), and internal threads are provided inside both the housing (2) and the end cover lock block (14). The housing (2) and the end cover lock block (14) are respectively threadedly connected to the limiting end cover (13).

6. The composite slider constant velocity universal joint according to claim 5, characterized in that, A seal (15) is further included, and the seal (15) is arranged between the limiting end cover (13) and the end cover lock block (14).

7. The composite slider constant velocity universal joint according to claim 6, characterized in that, The seal (15) includes a leather cup gasket.

8. The composite slider constant velocity universal joint according to claim 1, characterized in that, A spherical pair base (16) is detachably arranged in the housing (2), and a spherical pair structure adapted to the spherical pair base (16) is arranged at one end of the spline-like shaft (1) close to the housing (2).

9. A universal joint transmission device, characterized in that, The universal joint transmission device is provided with the composite slider constant velocity universal joint according to any one of claims 1-8.

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