Universal joint, driving shaft assembly and automobile

Abstract

The invention provides a universal joint, a driving shaft assembly and an automobile, the universal joint comprises a first connecting shaft and an outer shell fixedly connected with the first connecting shaft, and the outer shell is provided with an arc-shaped cavity with an opening deviating from the first connecting shaft; the inner shell is located in the arc-shaped cavity and rotationally connected with the outer shell, and the second connecting shaft is assembled in the inner shell in a sliding mode and can rotate relative to the inner shell. The circle center around which the inner shell rotates and the circle center around which the second connecting shaft rotates are located on the axis of the second connecting shaft; the sliding direction of the second connecting shaft is parallel to the axis of the inner shell. According to the technical scheme, by means of rotation between the outer shell and the inner shell and sliding and rotation cooperation between the inner shell and the connecting shaft, the rotation angle of the universal joint is increased, and the universal joint with the larger rotation angle is provided.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a universal joint, a drive shaft assembly and an automobile. Background Art

[0002] Universal joints are mechanical parts that realize variable-angle power transmission. They are used in places where the direction of the transmission axis needs to be changed. They are the "joint" parts of the universal transmission device of the automobile drive system. The combination of a universal joint and a transmission shaft is called a universal joint transmission device. In front-engine rear-wheel drive vehicles, the universal joint transmission device is installed between the transmission output shaft and the input shaft of the drive axle final reducer; while front-engine front-wheel drive vehicles omit the transmission shaft, and the universal joint is installed between the front axle half shaft and the wheel, which is responsible for both driving and steering.

[0003] The maximum swing angle of the existing universal joint is 50°. As the requirements for turning radius and off-road capability of vehicles continue to increase, the rotation angle of the current universal joint can no longer meet the requirements. Summary of the invention

[0004] The present application provides a universal joint, a drive shaft assembly and a car, which are used to increase the rotation angle of the universal joint.

[0005] In a first aspect, a universal joint is provided, the universal joint comprising: a first connecting shaft, an outer shell fixedly connected to the first connecting shaft, wherein the outer shell has an arc-shaped cavity with an opening facing away from the first connecting shaft; an inner shell located in the arc-shaped cavity and rotatably connected to the outer shell, and a second connecting shaft slidably mounted in the inner shell and rotatable relative to the inner shell;

[0006] Wherein, the center of the circle around which the inner shell rotates and the center of the circle around which the second connecting shaft rotates are located on the axis of the second connecting shaft;

[0007] The sliding direction of the second connecting shaft is parallel to the axis of the inner housing.

[0008] In the above technical solution, the rotation angle of the universal joint is increased by adopting the rotation between the outer shell and the inner shell and the sliding and rotation cooperation between the inner shell and the second connecting shaft, thereby providing a universal joint with a larger rotation angle.

[0009] In a specific implementation scheme, a first retaining frame is fixed on the outer side wall of the inner shell, and a plurality of rollable primary balls are mounted on the first retaining frame;

[0010] The inner wall of the outer shell is provided with an arc-shaped rolling track for rolling cooperation with the plurality of primary balls.

[0011] In a specific implementation scheme, a second retaining frame is provided on the second connecting shaft, and a plurality of rollable secondary balls are mounted on the second retaining frame;

[0012] A cylindrical cavity is arranged on the inner shell; and a linear raceway corresponding to the plurality of secondary balls is arranged on the inner wall of the cylindrical cavity.

[0013] In a specific embodiment, the diameter of the primary balls is greater than the diameter of the secondary balls.

[0014] In a specific possible implementation manner, the cylindrical cavity is a cavity with one end open; and the open end of the cylindrical cavity is the insertion end of the second connecting shaft;

[0015] The open end of the cylindrical cavity is provided with a retaining spring for limiting the secondary ball in the corresponding linear raceway.

[0016] In a specific embodiment, the cross section of the side wall of the second retaining frame is arc-shaped.

[0017] In a specific implementation manner, the maximum rotation angle of the inner housing relative to the outer housing is α, and the maximum rotation angle of the second connecting shaft relative to the inner housing is β, wherein α>β.

[0018] In a specific possible implementation scheme, it also includes a protective sleeve, one end of which is fixedly connected to the outer shell, and the other end of the protective sleeve is fixedly connected to the second connecting shaft; the inner shell, the first retaining frame, and the second retaining frame are all located in the space enclosed by the outer shell and the protective sleeve.

[0019] In a specific possible implementation manner, one end of the protective sleeve is fixedly connected to the outer shell through a first clamp;

[0020] The other end of the protective sleeve is fixedly connected to the second connecting shaft through a second clamp.

[0021] In a specific possible implementation manner, the diameter of the second connecting shaft gradually increases along a direction away from the inner housing.

[0022] In a second aspect, a drive shaft assembly is provided, the drive shaft assembly comprising a driving shaft, a driven shaft and a universal joint as described in any one of the above items; wherein:

[0023] The driving shaft is fixedly connected to the first connecting shaft, and the driven shaft is fixedly connected to the second connecting shaft, or the driving shaft is fixedly connected to the second connecting shaft, and the driven shaft is fixedly connected to the first connecting shaft.

[0024] In the above technical solution, the rotation angle of the universal joint is increased by adopting the rotation between the outer shell and the inner shell and the sliding and rotation cooperation between the inner shell and the second connecting shaft, thereby providing a universal joint with a larger rotation angle.

[0025] According to a third aspect, a vehicle is provided, comprising a vehicle body and any one of the universal joints described above.

[0026] In the above technical solution, the rotation angle of the universal joint is increased by adopting the rotation between the outer shell and the inner shell and the sliding and rotation cooperation between the inner shell and the second connecting shaft, thereby providing a universal joint with a larger rotation angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a universal joint provided in an embodiment of the present application;

[0028] Figure 2 A cross-sectional schematic diagram of a universal joint provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the rotation angle of the second connecting shaft relative to the inner shell provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0031] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] To facilitate understanding of the universal joint provided in the embodiment of the present application, its application scenario is first described. The universal joint provided in the embodiment of the present application is applied to a car and is used to connect a driving shaft and a driven shaft to transmit torque. The current universal joint has a small rotation angle and poor adaptability. To this end, the embodiment of the present application provides a universal joint to increase the rotation angle of the universal joint and improve its adaptability. It is described in detail below in conjunction with specific drawings and embodiments.

[0033] refer to Figure 1 and Figure 2 As shown, Figure 1 The structure diagram of the universal joint provided in the embodiment of the present application is shown. Figure 2 The cross-sectional view of the universal joint is shown. The universal joint provided in the embodiment of the present application is used to connect the driving shaft and the driven shaft. The two ends of the universal joint have connecting shafts to connect with the driving shaft and the driven shaft respectively. For the convenience of description, the two connecting shafts are named as the first connecting shaft 100 and the second connecting shaft 200. Figure 1 The first connecting shaft 100 is connected to the driving shaft, and the second connecting shaft 200 is connected to the driven shaft. In addition, when the universal joint is in use, the second connecting shaft 200 can also be connected to the driving shaft, and the first connecting shaft 100 can be connected to the driven shaft.

[0034] Continue to refer Figure 2 The universal joint provided in the embodiment of the present application includes a first connecting shaft 100, an outer shell 10, an inner shell 40 nested in the outer shell 10, and a second connecting shaft 200 nested in the inner shell 40. Among them, the first connecting shaft 100 is fixedly connected to the outer shell 10 and is used to connect the driving shaft or the driven shaft. The outer shell 10 and the inner shell 40 rotate relative to each other. Specifically, the outer shell 10 has an arc-shaped cavity with an opening away from the first connecting shaft 100, and the inner shell 40 is located in the arc-shaped cavity and is rotatably connected to the outer shell 10. The second connecting shaft 200 is used to connect the driving shaft or the driven shaft. The second connecting shaft 200 and the inner shell 40 slide and rotate relative to each other, thereby realizing a two-stage rotational fit to increase the rotation angle range of the universal joint. The above-mentioned two-stage rotational fit refers to: the relative rotation between the outer shell 10 and the inner shell 40, and the rotational fit between the inner shell 40 and the second connecting shaft 200.

[0035] When the rotational fit is implemented, the center of the circle about which the inner housing 40 rotates relative to the outer housing 10 is aligned with the center of the circle about which the second connecting shaft 200 rotates relative to the inner housing 40 and the axis of the connecting shaft (such as Figure 2The center of the circle A, the center of the circle O and the axis L shown in the figure are arranged so that the rotation angle of the inner housing 40 is superimposed on the rotation angle of the second connecting shaft 200, thereby increasing the overall rotation angle of the universal joint. Exemplarily, the rotation angle of the inner housing 40 relative to the outer housing 10 is α, and the rotation angle of the second connecting shaft 200 relative to the outer housing 10 is β, and the overall rotation angle is obtained by calculating the angles of α and β. It should be understood that the superposition mentioned above in the present application does not simply refer to the addition of two angles, but refers to the total angle obtained by angle calculation being greater than α.

[0036] In the embodiment of the present application, the size of β is an adjustable angle, and the adjustment is achieved by the relative sliding between the second connecting shaft 200 and the inner housing 40. Specifically, the sliding direction of the second connecting shaft 200 is parallel to the axis of the inner housing 40. That is, in the embodiment of the present application, the center of the circle of rotation of the inner housing 40 is also located on the axis of the first connecting shaft 100. When the rotation angle of the universal joint is 0, the driving shaft and the driven shaft are coaxial, and the center of the circle around which the inner housing 40 rotates and the center of the circle around which the second connecting shaft 200 rotates are both located on the axis of the second connecting shaft 200, and are arranged along the direction of the axis of the driving shaft. Thereby, the cantilever vibration and internal sub-component friction loss caused by different centers can be reduced, and the efficiency can be improved.

[0037] The angle β is limited by the fit between the inner shell 40 and the second connecting shaft 200. Its maximum value is when the second connecting shaft 200 abuts against the side wall of the inner shell 40 when rotating. Therefore, in the embodiment of the present application, the second connecting shaft 200 slides with the inner shell 40 to change the position of the center of the circle around which the second connecting shaft 200 rotates, thereby changing the rotation angle of the second connecting shaft 200 when it rotates to abut against the side wall of the inner shell 40. The relationship between the sliding fit and the rotation angle satisfies that: along the direction in which the second connecting shaft 200 slides from the inside to the outside of the inner shell 40, the rotation angle gradually increases. Figure 3 The maximum rotation angle examples of the second connecting shaft 200 at different positions are shown. When at position O1, the corresponding rotation angle is β1; when at position O2, the corresponding rotation angle is β2. The position of O1 relative to O2 is far away from the opening of the inner shell 40, and β1<β2.

[0038] When in use, according to the vehicle's requirement for the rotation angle of the universal joint, the universal joint automatically adjusts the sliding position of the second connecting shaft 200 in the inner shell 40, so that the rotation angle corresponding to the second connecting shaft 200 at this position and the rotation angle of the inner shell 40 relative to the outer shell 10 are superimposed to meet the vehicle's requirement for the rotation angle of the universal joint.

[0039] It can be seen from the above description that the universal joint provided in the embodiment of the present application increases the rotation angle of the universal joint by adopting the rotation between the outer shell 10 and the inner shell 40 and the sliding and rotation between the inner shell 40 and the connecting shaft, thereby providing a universal joint with a larger rotation angle.

[0040] Continue to refer Figure 2 It should be understood that in the embodiment of the present application, the outer shell 10 has a cavity (first cavity 12), the opening direction of the first cavity 12 is away from the first connecting shaft 100, and the inner shell 40 is inserted into the first cavity 12 of the outer shell 10 through the opening. Among them, the first cavity 12 is an arc-shaped cavity, and the inner shell 40 can rotate in the arc-shaped cavity.

[0041] Similarly, the inner shell 40 also has a cavity (second cavity 42), an opening of which faces away from the first connecting shaft 100, and the second connecting shaft 200 is inserted into the second cavity 42 from the opening. The second cavity 42 is a cylindrical cavity, and the second connecting shaft 200 is assembled into the second cavity 42, and can slide in the second cavity 42 and rotate relative to the second connecting shaft 200.

[0042] Continue to refer Figure 2 When the inner housing 40 and the outer housing 10 rotate and cooperate, a first retainer 30 is fixed on the outer side wall of the inner housing 40, and a plurality of rollable primary balls 31 are mounted on the first retainer 30. Exemplarily, the overall shape of the inner housing 40 is cylindrical, and the first retainer 30 is an annular retainer, which is mounted on the side wall of the inner housing 40. The center of the first retainer 30 is coaxial with the axis of the inner housing 40, so that the first retainer 30 and the inner housing 40 rotate coaxially. When multiple primary balls 31 are arranged, the multiple primary balls 31 are arranged at intervals and limited by the first retainer 30.

[0043] In addition, a plurality of arcuate raceways 11 are provided on the inner wall of the outer shell 10. The plurality of arcuate raceways 11 are provided on the inner wall of the first cavity 12, and extend along the arc direction of the inner wall of the first cavity 12, thereby forming a plurality of arcuate raceways 11. The plurality of arcuate raceways 11 share a common spherical center, and define the spherical center around which the inner shell 40 rotates. When the inner shell 40 is assembled into the outer shell 10, a plurality of primary balls 31 are assembled one by one on the plurality of arcuate raceways 11, and each primary ball 31 rolls with the inner shell 40 and the arcuate raceway 11, respectively. When the inner shell 40 rotates relative to the outer shell 10, the friction force of the inner shell 40 during rotation can be reduced by the rolling of the primary balls 31.

[0044] In an optional solution, the arcuate raceway 11 allows the primary ball 31 to limit the inner shell 40 in the outer shell 10 when rolling to this position. In addition, the curvature of the arcuate raceway 11 also limits the rotation angle of the inner shell 40 relative to the outer shell 10.

[0045] Continue to refer Figure 2 When the inner housing 40 and the second connecting shaft 200 are slidably and rotatably matched, a second retainer 50 is provided on the connecting shaft, and a plurality of rolling secondary balls 51 are mounted on the second retainer 50. The structure in which the second connecting shaft 200 and the second retainer 50 are matched is a cylindrical structure. The second retainer 50 is an annular structure, which is mounted on the side wall of the second connecting shaft 200. A plurality of secondary balls 51 are nested on the second retainer 50 and arranged at intervals. A plurality of secondary balls 51 can roll relative to the second retainer 50.

[0046] Correspondingly, a cylindrical cavity (second cavity 42) is provided on the inner shell 40; a linear raceway 41 corresponding to a plurality of secondary balls 51 is provided on the inner wall of the cylindrical cavity. The plurality of linear raceways 41 are arranged in a ring around the axis of the second cavity 42, and when the second connecting shaft 200 is inserted into the second cavity 42, the second connecting shaft 200 and the second cavity 42 are aligned. During assembly, the second connecting shaft 200 is inserted into the second cavity 42, and the plurality of secondary balls 51 on the second retaining frame 50 are slidably matched with the plurality of linear raceways 41 one by one. When the second connecting shaft 200 slides in the second cavity 42, the sliding friction can be converted into rolling friction by the rolling of the secondary balls 51, thereby reducing the friction during the sliding connection. In addition, since the second connecting shaft 200 and the inner wall of the second cavity 42 are rollingly matched through the secondary balls 51, there is a gap between the second connecting shaft 200 and the inner wall of the second cavity 42, and the second connecting shaft 200 can rotate to a certain extent relative to the inner housing 40. The rotation angle is affected by the size of the secondary balls and the length of the second connecting shaft 200 inserted into the inner housing 40.

[0047] In an optional solution, the cross section of the side wall of the second retainer 50 is arc-shaped. That is, the second retainer 50 is a drum-shaped structure. When this structure is adopted, the second retainer 50 has a certain avoidance function. When the second connecting shaft 200 rotates relative to the inner housing 40, the interference between the second retainer 50 and the inner housing 40 is reduced, and the rotation angle of the second connecting shaft 200 relative to the inner housing 40 is increased.

[0048] In an optional solution, the second cavity 42 provided in the embodiment of the present application is a cavity with an open end, the closed end of the second cavity 42 faces the first connecting shaft 100, and the open end faces away from the second connecting shaft 200, and the open end is the insertion end of the second connecting shaft 200. In order to ensure that the second connecting shaft 200 will not be separated from the second cavity 42, a retaining spring 60 is provided at the open end of the second cavity 42, and the retaining spring 60 is used to limit the secondary ball 51 in the corresponding linear raceway 41. That is, in the present application, the end of the linear raceway 41 close to the open end of the second cavity 42 has an opening to facilitate the insertion of the secondary ball 51 into the corresponding linear raceway 41. After the assembly is completed, the opening of the linear raceway 41 is blocked by the retaining spring 60 to limit the secondary ball 51 in the linear raceway 41.

[0049] It should be understood that in a specific configuration, when the axes of the first connecting shaft 100 and the second connecting shaft 200 are collinear, the axes of the first retaining frame 30 and the second retaining frame 50 are collinear with the axes of the first connecting shaft 100 and the second connecting shaft 200 .

[0050] In a specific embodiment, the maximum angle of rotation of the inner housing 40 relative to the outer housing 10 is α, and the maximum angle of rotation of the connecting shaft relative to the inner housing 40 is β, wherein α>β. Exemplarily, α is between 45°-50°; and β is between 10° and 30°, which is significantly greater than the swing angle of only 50 degrees in the prior art. The overall swing angle of the universal joint provided by the embodiment of the present application is increased. In addition, the universal joint provided by the embodiment of the present application also has a certain sliding function (sliding of the second connecting shaft 200 relative to the inner housing 40), and the overall sliding telescopic amount is within ±25mm.

[0051] In addition, when setting the secondary ball, the diameter of the primary ball is larger than that of the secondary ball. The secondary ball adopts a smaller diameter, and the diameter of the second connecting shaft 200 inserted into the second cavity 42 is relatively increased to ensure the structural strength of the second connecting shaft 200.

[0052] In an optional solution, the diameter of the second connecting shaft 200 gradually increases in a direction away from the inner housing 40. Figure 2 It can be seen that the second connecting shaft 200 provided in the embodiment of the present application includes a small cylinder (a structure that cooperates with the second retainer 50), a truncated cone cylinder, and a large cylinder. On the one hand, it is convenient for sliding and rotating with the inner housing 40, and on the other hand, it increases the structural strength of the second connecting shaft 200 and facilitates the connection with the driven shaft. Of course, in the embodiment of the present application, the second connecting shaft 200 can also be an integrated structure with the driven shaft, and the first connecting shaft 100 can also be an integrated structure with the driving shaft.

[0053] In order to protect the inner housing 40, the first retainer 30, the second retainer 50 and other structures, the universal joint provided in the embodiment of the present application further includes a protective sleeve 20, one end of which is fixedly connected to the outer housing 10, and the other end of the protective sleeve 20 is fixedly connected to the connecting shaft, thereby enclosing a closed space. The inner housing 40, the first retainer 30, and the second retainer 50 are all located in the space enclosed by the outer housing 10 and the protective sleeve 20. This prevents external debris from colliding with the rotating parts of the universal joint.

[0054] In an optional solution, one end of the protective cover 20 is fixedly connected to the outer shell 10 through a first clamp 21, and the other end of the protective cover 20 is fixedly connected to the second connecting shaft 200 through a second clamp 22. The two ends of the protective cover 20 are respectively fixed to the outer shell 10 and the second connecting shaft 200 through two clamps. It should be understood that the protective cover 20 provided in the embodiment of the present application is a retractable and bendable protective cover 20. Exemplarily, the protective cover 20 is a telescopic cover.

[0055] The embodiment of the present application also provides a drive shaft assembly, which includes a driving shaft, a driven shaft and a universal joint of any of the above items; wherein the driving shaft is fixedly connected to the outer shell 10, and the driven shaft is fixedly connected to the connecting shaft. Specifically, the driving shaft is fixedly connected to the outer shell 10 through the first connecting shaft 100, and the driven shaft is fixedly connected to the second connecting shaft 200. Alternatively, the driving shaft can be fixedly connected to the connecting shaft (the second connecting shaft 200), and the driven shaft can be fixedly connected to the outer shell 10, such as the driven shaft is fixedly connected to the outer shell through the first connecting shaft 100, so that when the driving shaft rotates, the torque of the driving shaft can be transmitted to the driven shaft through the universal joint.

[0056] It can be seen from the above description that the universal joint used in the drive shaft assembly provided in the present application increases the rotation angle of the universal joint by adopting the rotation between the outer shell 10 and the inner shell 40 and the sliding and rotation coordination between the inner shell 40 and the connecting shaft, thereby providing a universal joint with a larger rotation angle.

[0057] The embodiment of the present application also provides a car, which includes a car body and any one of the above universal joints. It can be seen from the above description that the universal joint used in the car provided in the embodiment of the present application increases the rotation angle of the universal joint by using the rotation between the outer shell 10 and the inner shell 40 and the sliding and rotation cooperation between the inner shell 40 and the connecting shaft, thereby providing a universal joint with a larger rotation angle.

[0058] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0059] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A universal joint, characterized in that: include: A first connecting shaft, an outer shell fixedly connected to the first connecting shaft, wherein the outer shell has an arc-shaped cavity with an opening facing away from the first connecting shaft; an inner shell located in the arc-shaped cavity and rotatably connected to the outer shell, and a second connecting shaft slidably mounted in the inner shell and rotatable relative to the inner shell; Wherein, the center of the circle around which the inner shell rotates and the center of the circle around which the second connecting shaft rotates are located on the axis of the second connecting shaft; The sliding direction of the second connecting shaft is parallel to the axis of the inner housing.

2. The universal joint according to claim 1, characterized in that: A first retaining frame is fixed on the outer wall of the inner shell, and a plurality of rollable primary balls are mounted on the first retaining frame; The inner wall of the outer shell is provided with an arc-shaped rolling track for rolling cooperation with the plurality of primary balls.

3. The universal joint according to claim 2, characterized in that: The second connecting shaft is provided with a second retaining frame, and the second retaining frame is provided with a plurality of rolling secondary balls; A cylindrical cavity is arranged on the inner shell; and a linear raceway corresponding to the plurality of secondary balls is arranged on the inner wall of the cylindrical cavity.

4. The universal joint according to claim 3, characterized in that: The diameter of the primary ball is greater than the diameter of the secondary ball.

5. The universal joint according to claim 3, characterized in that: The cylindrical cavity is a cavity with one end open; and the open end of the cylindrical cavity is the insertion end of the second connecting shaft; The open end of the cylindrical cavity is provided with a retaining spring for limiting the secondary ball in the corresponding linear raceway.

6. The universal joint according to claim 3, characterized in that: The cross section of the side wall of the second retaining frame is arc-shaped.

7. The universal joint according to any one of claims 1 to 6, characterized in that: The maximum rotation angle of the inner shell relative to the outer shell is α, and the maximum rotation angle of the second connecting shaft relative to the inner shell is β, wherein α>β.

8. The universal joint according to claim 7, characterized in that: It also includes a protective sleeve, one end of which is fixedly connected to the outer shell, and the other end of which is fixedly connected to the second connecting shaft; the inner shell, the first retaining frame, and the second retaining frame are all located in the space surrounded by the outer shell and the protective sleeve.

9. The universal joint according to claim 8, characterized in that: One end of the protective sleeve is fixedly connected to the outer shell through a first clamp; The other end of the protective sleeve is fixedly connected to the second connecting shaft through a second clamp.

10. The universal joint according to claim 6, characterized in that: The diameter of the second connecting shaft gradually increases in a direction away from the inner housing.

11. A drive shaft assembly, characterized in that: It comprises a driving shaft, a driven shaft and a universal joint as claimed in any one of claims 1 to 10; wherein: The driving shaft is fixedly connected to the first connecting shaft, and the driven shaft is fixedly connected to the second connecting shaft, or the driving shaft is fixedly connected to the second connecting shaft, and the driven shaft is fixedly connected to the first connecting shaft.

12. A car, characterized in that: The vehicle comprises a vehicle body and a universal joint as claimed in any one of claims 1 to 10.

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