A novel cross-shaped universal joint bearing

Abstract

This invention discloses a novel cross-shaft universal joint bearing, comprising a cross shaft and multiple bearings mounted on the cross shaft. The cross shaft is filled with lubricating fluid. The bearing bushings in the multiple bearings comprise a metal base and a gasket. The metal base is made of precipitation-hardening stainless steel, and the gasket is primarily made of polyester, polytetrafluoroethylene fiber, and pre-impregnated rubber, with a twill texture on its surface. Multiple sealing components are connected to the cross shaft, each located on one side of one of the bearings. In use, the gasket and metal base are bonded together using an adhesive to create a self-lubricating bearing bushing. This bushing is then fitted to the cross shaft, resulting in a cross-shaft universal joint bearing with excellent self-lubricating properties, a low coefficient of friction, and the ability to operate under high load and high speed conditions for extended periods.

Description

Technical Field

[0001] This invention relates to the field of universal joint bearing technology, and more specifically, to a novel cross-type universal joint bearing. Background Technology

[0002] Universal joint bearings refer to mechanical structures that use ball joints to transmit power between different shafts. They are a very important component of automotive bearings. The combination of a universal joint and a drive shaft is called a universal joint transmission device. Universal joint bearings can be classified as follows: constant velocity universal thrust ball joint, constant velocity universal joint, ball cage type universal joint, three-pin type universal joint, double-joint type universal joint, etc.

[0003] When motion and torque are transmitted between two rotating shafts at varying angles, significant impact and static loads occur during transmission. Furthermore, at high speeds, intense friction arises between the two friction surfaces. Harsh working environments and difficulties in lubricating the universal joint bearings can accelerate wear and failure due to prolonged high-load, high-speed operation, ultimately leading to damage to corresponding components.

[0004] Therefore, we propose a novel cross-type universal joint bearing to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a novel cross-shaped universal joint bearing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a novel cross-shaft universal joint bearing, comprising a cross shaft and multiple bearings disposed on the cross shaft, the cross shaft being filled with lubricating fluid, the bearing bushings of the multiple bearings comprising a metal base and a gasket cloth, the metal base being made of precipitation-hardening stainless steel, the gasket cloth being primarily made of polyester, polytetrafluoroethylene fiber, and prepreg, and the surface of the gasket cloth having a twill texture; multiple sealing assemblies are connected to the cross shaft, the multiple sealing assemblies being respectively located on one side of the multiple bearings; a drive assembly is connected to the cross shaft, a storage assembly is connected to the cross shaft, the drive assembly and the storage assembly being symmetrically arranged, the storage assembly having an oil filling port; a rotating assembly is provided in the cross shaft, the two ends of the rotating assembly extending into the drive assembly and the storage assembly respectively; a conduction assembly is connected to the rotating assembly, and the conduction assembly is located inside the cross shaft; multiple heat-conducting assemblies are connected to the cross shaft, each of the multiple heat-conducting assemblies being connected to a cooling assembly, and each of the multiple heat-conducting assemblies being connected to a heat dissipation assembly.

[0007] In the process of using this invention, after the liner cloth and the metal base are bonded and fixed with an adhesive, a bearing bush with self-lubricating properties is manufactured. At the same time, the bearing bush is matched with the cross shaft, so that the cross shaft universal joint bearing has good self-lubricating properties, low friction coefficient, and can operate under high load and high speed conditions for a long time.

[0008] In a preferred embodiment, the sealing assembly includes a dust stop ring fitted onto a cross shaft, the dust stop ring being located on one side of the bearing, two conical rings being fixedly connected to the side wall of the dust stop ring, the two conical rings being located on one side of the bearing respectively, a protective ring being fixedly connected to the side wall of the dust stop ring, and a plurality of balls in contact with the bearing being embedded in the side wall of the protective ring.

[0009] In a preferred embodiment, the drive assembly includes a protective cylinder extending through the surface of the cross shaft, wherein a plurality of electromagnetic columns are arranged in a circular array within the protective cylinder, and a first sealing cap is fixedly connected to the inner wall of one end of the protective cylinder.

[0010] In a preferred embodiment, the storage assembly includes a storage cylinder extending through the surface of a cross shaft. A second sealing cap is fixedly connected to the inner wall of one end of the storage cylinder. A movable circular plate is provided inside the storage cylinder. An oil inlet is provided on the storage cylinder. The initial position of the circular plate is above the oil inlet. Lubricating grease is filled between the circular plate and the second sealing cap. Two vertical rods passing through the side wall of the circular plate are fixedly connected to the inner top of the storage cylinder. Two through holes are provided on the second sealing cap. The storage cylinder and the protective cylinder are symmetrically arranged.

[0011] In a preferred embodiment, the rotating assembly includes a rotating shaft disposed inside the cross shaft. The two ends of the rotating shaft pass through the first sealing cover and the second sealing cover respectively and extend into the protective cylinder and the storage cylinder. Multiple magnetic columns matching the electromagnetic columns are arranged in a ring array on the surface of the rotating shaft. A first bearing is provided at the connection between the first sealing cover and the second sealing cover. The rotating shaft is threadedly connected to the circular plate via a reciprocating thread.

[0012] In a preferred embodiment, the transmission assembly includes two turbine blades coaxially fixedly connected to the side wall of a rotating shaft, a collar coaxially fixedly connected to the side wall of the rotating shaft, and two symmetrical scraper rods fixedly connected to the side wall of the collar. One end of each of the two scraper rods is located below a through hole. The lower end face of the second sealing cover is provided with two second bearings, and each of the two second bearings is rotatably connected to a friction cylinder that contacts the two scraper rods respectively.

[0013] In a preferred embodiment, the heat-conducting assembly includes a heat-conducting box fixedly connected to a cross shaft. A plurality of first copper pillars connected to the cross shaft are fixedly connected to the side wall of the heat-conducting box. A copper plate is fixedly connected to one end of each of the plurality of first copper pillars, and the copper plate is located inside the heat-conducting box.

[0014] In a preferred embodiment, the cooling assembly includes multiple second copper pillars disposed in a heat-conducting box, a coolant column is fixedly connected to the bottom of the heat-conducting box, the coolant column is filled with coolant, the two ends of the multiple second copper pillars are respectively connected to the coolant column and a copper plate, and the surface of the heat-conducting box is provided with multiple heat dissipation holes.

[0015] In a preferred embodiment, the heat dissipation assembly includes a crossbar fixedly connected to the side wall of the heat conduction box, a breathing box fixedly connected to one end of the crossbar, a sliding groove provided on the inner side wall of the breathing box, a slider slidably connected in the sliding groove, a movable bead fixedly connected to the side wall of the slider, two symmetrical openings provided on the side wall of the breathing box, a breathing plate passing through each of the two openings, a spring connected to the breathing plate fixedly connected to the inner side wall of the opening, and a connecting plate provided between the two breathing plates, the connecting plate being located on one side of the slider.

[0016] The technical effects and advantages of this invention are as follows: In this invention, the liner cloth and metal base are bonded and fixed with an adhesive to create a self-lubricating bearing bushing. The bearing bushing is then fitted with a cross shaft, giving the cross shaft universal joint bearing excellent self-lubricating properties and a low coefficient of friction. This allows it to operate under high load and high speed conditions for extended periods. The device also provides excellent sealing for the bearing and cools the cross shaft, reducing lubricant evaporation and extending its service life. Furthermore, the device allows for periodic grease addition to the cross shaft, eliminating the need for frequent grease replenishment by operators, reducing their workload, and accelerating lubricant flow. This ensures good rotational performance of the bearing bushing, improving the device's overall rotational efficiency and indirectly enhancing its practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view schematic diagram of the connection structure of the present invention; Figure 3 This is a schematic diagram of the connection structure of the sealing assembly in this invention; Figure 4 This is a schematic diagram of the first partial cross-sectional connection structure in this invention; Figure 5 for Figure 4A partially enlarged schematic diagram of the connection structure at point A in the middle; Figure 6 This is a schematic diagram of the second partial cross-sectional connection structure in this invention; Figure 7 for Figure 6 A magnified schematic diagram of the connection structure at point B in the middle; Figure 8 This is a schematic diagram of the external connection structure of the heat-conducting box in this invention; Figure 9 This is a schematic diagram of the internal connection structure of the heat-conducting box in this invention; Figure 10 This is a schematic diagram of the connection structure of the heat dissipation component in this invention.

[0018] The attached figures are labeled as follows: 1 cross shaft, 2 bearing, 3 sealing assembly, 31 dust stop ring, 32 conical ring, 33 protective ring, 34 ball bearing, 4 oil inlet, 5 drive assembly, 51 protective cylinder, 52 electromagnetic column, 53 first sealing cover, 6 storage assembly, 61 storage cylinder, 62 second sealing cover, 63 circular plate, 64 vertical rod, 65 through hole, 7 rotating assembly, 71 rotating shaft, 72 magnetic column, 73 first bearing, 74 reciprocating thread, 8 conduction assembly, 81 turbine blade, 82 collar, 83 scraper, 84 second bearing, 85 friction cylinder, 9 heat conduction assembly, 91 heat conduction box, 92 first copper column, 93 copper plate, 10 cooling assembly, 101 second copper column, 102 heat dissipation hole, 103 coolant column, 11 heat dissipation assembly, 111 crossbar, 112 breather box, 113 slide groove, 114 slider, 115 moving ball, 116 opening, 117 breather plate, 118 connecting plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figure 1 and Figure 2A novel cross-shaft universal joint bearing includes a cross shaft 1 and multiple bearings 2 disposed on the cross shaft 1. The cross shaft 1 is filled with lubricating fluid. The bearing bushings of the multiple bearings 2 include a metal base and a liner. The metal base is made of precipitation-hardening stainless steel, specifically 05Cr15Ni5Cu4Nb, which can improve the bearing's load-bearing capacity. The liner enhances the bearing's self-lubricating performance, reduces the bearing's coefficient of friction, and further reduces the bearing's wear. The main materials of the liner are polyester, polytetrafluoroethylene fiber, and prepreg. The surface of the liner has a twill texture. The raw materials for the twill fabric are polyester and polytetrafluoroethylene fiber. Due to the three-up-one-down or two-up-one-down interlacing method used in the weaving process, it has a twill texture. The twill weave allows more PTFE fibers to appear on the front side of the twill fabric, giving it good self-lubricating properties and a low coefficient of friction. The prepreg is a mixed adhesive, whose main components include phenolic resin, carbon black, graphite powder, molybdenum disulfide, curing agent, and reinforcing agent, with a mass ratio of 92.5:0.5:1.5:1.5:2:2. After the twill fabric and prepreg are made, the prepreg is evenly coated onto the surface of the prepreg fabric. The prepreg fabric is then placed on a vulcanizing machine for pressurization (1.5 MPa) and heating. It is kept at 75-80℃ for 1-2 hours and at 120-130℃ for 2-3 hours. After heating and heating, it is allowed to cool naturally. The cooled prepreg fabric is then machined to achieve the designed dimensions and thickness. At this point, the prepreg fabric becomes a lining fabric with self-lubricating and wear-resistant properties. After the liner cloth is bonded and fixed to the metal base with an adhesive, the self-lubricating bearing bushing is manufactured. The bearing bushing is then fitted with the cross shaft to complete the manufacturing of the cross shaft universal joint bearing.

[0021] Reference Figure 3 Multiple sealing components 3 are connected to the cross shaft 1. Each sealing component 3 includes a dust stop ring 31 fitted onto the cross shaft 1. The dust stop ring 31 is located on one side of the bearing 2 and serves to install and support other components. Two conical rings 32 are fixedly connected to the side wall of the dust stop ring 3. The two conical rings 32 are located on one side of the bearing 2, and their cross-sections are triangular, allowing one end of the conical ring 32 to overlap the bearing 2. This further prevents impurities and foreign objects from entering the connection between the bearing 2 and the cross shaft 1. A protective ring 33 is fixedly connected to the side wall of the dust stop ring 31. Multiple balls 34 that contact the bearing 2 are embedded in the side wall of the protective ring 33. The multiple sealing components 3 are located on one side of multiple bearings 2. It is particularly noteworthy that the balls 34 can block larger impurities and foreign objects, while also ensuring the normal operation of the bearing 2. Furthermore, the cylindrical shape of the protective ring 33 further prevents external foreign objects from contacting the bearing 2, thereby extending the service life of the bearing 2.

[0022] Reference Figure 4 and Figure 6 A drive assembly 5 is connected to the cross shaft 1. The drive assembly 5 includes a protective cylinder 51 that extends through the surface of the cross shaft 1. The protective cylinder 51 contains a plurality of electromagnetic columns 52 arranged in a ring array. It is particularly noteworthy that the magnetic poles of two adjacent electromagnetic columns 52 are opposite, so that when used in conjunction with the magnetic columns 72, the rotating shaft 71 is rotated, and the circular plate 63 is moved. A first sealing cover 53 is fixedly connected to the inner wall of one end of the protective cylinder 51.

[0023] Reference Figure 5 , Figure 6 and Figure 7 A storage component 6 is connected to the cross shaft 1. The storage component 6 includes a storage cylinder 61 that runs through the surface of the cross shaft 1. Lubricating grease is filled between the circular plate 61 and the second sealing cover 62. The second sealing cover 62 is fixedly connected to the inner wall of one end of the storage cylinder 61. A movable circular plate 63 is provided in the storage cylinder 61. An oil inlet 4 is provided on the storage cylinder 61. The initial position of the circular plate 63 is above the oil inlet 4. Two vertical rods 64 that pass through the side wall of the circular plate 63 are fixedly connected to the inner top of the storage cylinder 61. The second sealing cover 62 is provided with two through holes 65. It is worth noting that the cross-section of the through holes 65 is trapezoidal, which can prevent lubricating oil from entering the upper part of the second sealing cover 62. The small-diameter outlet is located at the bottom, while the large-diameter inlet is located at the top. The storage cylinder 61 and the protective cylinder 51 are symmetrically arranged, and the drive component 5 and the storage component 6 are symmetrically arranged.

[0024] Reference Figure 5 , Figure 6 and Figure 7 The cross shaft 1 is equipped with a rotating assembly 7, which includes a rotating shaft 71 disposed inside the cross shaft 1. The two ends of the rotating shaft 71 pass through the first sealing cover 53 and the second sealing cover 62 respectively and extend into the protective cylinder 51 and the storage cylinder 61. Multiple magnetic columns 72 matching the electromagnetic columns 52 are arranged in a ring array on the surface of the rotating shaft 71. The connection between the first sealing cover 53 and the second sealing cover 62 is provided with a first bearing 73. The rotating shaft 71 is threaded to the circular plate 63 through a reciprocating thread 74. The two ends of the rotating assembly 7 extend into the drive assembly 5 and the storage assembly 6 respectively. It is particularly noteworthy that the circular plate 63 is provided with an internal thread. With the assistance of the reciprocating thread 74 and the vertical rod 64, the circular plate 63 can move normally, thereby allowing the grease to be discharged and further ensuring the normal lubrication of the device.

[0025] Reference Figure 5 , Figure 6 and Figure 7A transmission component 8 is connected to the rotating component 7 and is located inside the cross shaft 1. The transmission component 8 includes two turbine blades 81 coaxially fixedly connected to the side wall of the rotating shaft 71. A collar 82 is coaxially fixedly connected to the side wall of the rotating shaft 71. Two symmetrical scraper rods 83 are fixedly connected to the side wall of the collar 82. One end of each scraper rod 83 is located below the through hole 65. The top of the scraper rod 83 is provided with a notch. When the grease is discharged, the scraper rod 83 can scrape the grease to one side, thereby preventing the grease from accumulating on one side of the through hole 65. Two second bearings 84 are provided on the lower end face of the second sealing cover 62. Each of the two second bearings 84 is rotatably connected to a friction cylinder 85 that contacts the two scraper rods 83. It is particularly noteworthy that when the friction cylinder 85 contacts the scraper rod 83, the scraper rod 83 can generate heat, which further softens the grease and allows it to quickly dissolve in the lubricating oil.

[0026] In actual operation, when the electromagnetic column 52 is working, with the assistance of the magnetic column 72 and the retraction of the cross shaft 1, the lubricating oil in the cross shaft 1 continuously moves, causing the turbine blades 81 to rotate. With the assistance of multiple forces, the rotating shaft 71 rotates, and with the assistance of the reciprocating thread 74 and the vertical rod 64, the circular plate 63 moves accordingly. It is particularly noteworthy that the pitch of the reciprocating thread 74 is relatively large, resulting in a slower movement speed of the circular plate. This allows the circular plate 63 to squeeze the lubricating grease out through the through hole 65. Simultaneously, when the rotating shaft 71 rotates, the collar 82 rotates, which in turn causes the scraper 83 to rotate. When the scraper 83 rotates, it comes into contact with the friction cylinder 85. Notably, the scraper 83 is made of a heat-conducting material, which allows the grease accumulated on the scraper 83 to soften quickly and dissolve into the lubricating oil. This ensures that the lubricating oil in the device is replenished periodically, further guaranteeing the lubrication effect and ensuring the normal operation of the device, thus indirectly improving its practicality.

[0027] Reference Figure 8 and Figure 9 Multiple heat-conducting components 9 are connected to the cross shaft 1. The heat-conducting components 9 include a heat-conducting box 91 fixedly connected to the cross shaft 1. Multiple first copper pillars 92 connected to the cross shaft 1 are fixedly connected to the side wall of the heat-conducting box 91. A copper plate 93 is fixedly connected to one end of each of the multiple first copper pillars 92. The copper plate 93 is located inside the heat-conducting box 91. It is particularly noteworthy that the first copper pillars 92 can transfer the heat on the cross shaft 1 to the interior of the heat-conducting box 92.

[0028] Reference Figure 9 and Figure 10Multiple heat-conducting components 9 are connected to cooling components 10. The cooling components 10 include multiple second copper pillars 101 disposed in the heat-conducting box 91. A coolant column 103 is fixedly connected to the bottom of the heat-conducting box 91. The coolant column 103 is filled with coolant. The two ends of the multiple second copper pillars 101 are respectively connected to the coolant column 103 and the copper plate 93. The surface of the heat-conducting box 91 is provided with multiple heat dissipation holes 102. With the assistance of the second copper pillars 101 and the coolant 103, the heat on the cross shaft 1 can be processed.

[0029] Reference Figure 10 Multiple heat-conducting components 9 are each connected to a heat dissipation component 11. The heat dissipation component 11 includes a crossbar 111 fixedly connected to the side wall of the heat-conducting box 91. One end of the crossbar 111 is fixedly connected to a breathing box 112. The inner side wall of the breathing box 112 is provided with a groove 113. A slider 114 is slidably connected in the groove 113. A movable bead 115 is fixedly connected to the side wall of the slider 114. The side wall of the breathing box 112 is provided with two symmetrical openings 116. A breathing plate 117 is passed through each of the two openings 116. A spring connected to the breathing plate 117 is fixedly connected to the inner side wall of the opening 116. A connecting plate 118 is provided between the two breathing plates 117. The connecting plate 118 is located on one side of the slider 114.

[0030] In actual operation, when the cross shaft 1 runs continuously, the slider 114 moves in the groove 113, which causes the moving ball 115 to move accordingly. This causes the connecting plate 118 to move due to the pressure of the moving ball 115. It is particularly noteworthy that when the connecting plate 118 moves, the breather plate 117 moves left and right accordingly. When the breather plate 117 moves, the airflow velocity increases, allowing external cold air to enter the breather box 91. This dissipates heat from the first copper column 92, the second copper column 101, and the coolant column 103, thus maintaining a good operating temperature for the cross shaft 1. It is also noteworthy that the breather plate 117 matches the opening 116. With the assistance of a spring, the breather plate 117 can be reset, allowing the device to operate normally again. This further prevents the lubricating oil from evaporating too quickly, indirectly extending the service life of the lubricating oil and improving the practicality of the device.

[0031] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cardan shaft bearing, characterized by; It includes a cross shaft (1) and multiple bearings (2) disposed on the cross shaft (1). The cross shaft (1) is filled with lubricating fluid. The bearing bushings of the multiple bearings (2) include a metal base and a liner. The metal base is made of precipitation hardening stainless steel. The main materials of the liner are polyester, polytetrafluoroethylene fiber and prepreg. The surface of the liner has a twill texture. Multiple sealing components (3) are connected to the cross shaft (1), and the multiple sealing components (3) are respectively located on one side of multiple bearings (2); A drive assembly (5) is connected to the cross shaft (1), and a storage assembly (6) is connected to the cross shaft (1). The drive assembly (5) and the storage assembly (6) are symmetrically arranged, and the storage assembly (6) is provided with an oil inlet (4). The cross shaft (1) is provided with a rotating component (7), and the two ends of the rotating component (7) extend into the driving component (5) and the storage component (6) respectively; The rotating assembly (7) is connected to a transmission assembly (8), and the transmission assembly (8) is located inside the cross shaft (1); Multiple heat-conducting components (9) are connected to the cross shaft (1), and cooling components (10) are connected to each of the multiple heat-conducting components (9). Heat dissipation components (11) are connected to each of the multiple heat-conducting components (9). The sealing component (3) includes a dust-stopping ring (31) sleeved on the cross shaft (1). The dust-stopping ring (31) is located on one side of the bearing (2). Two conical rings (32) are fixedly connected to the side wall of the dust-stopping ring (3). The two conical rings (32) are respectively located on one side of the bearing (2). A protective ring (33) is fixedly connected to the side wall of the dust-stopping ring (31). Multiple balls (34) that contact the bearing (2) are embedded in the side wall of the protective ring (33). The driving component (5) includes a protective cylinder (51) that penetrates the surface of the cross shaft (1). Multiple annular arrays are provided in the protective cylinder (51). The electromagnetic columns (52) are arranged in a row. A first sealing cap (53) is fixedly connected to the inner wall of one end of the protective cylinder (51). The storage component (6) includes a storage cylinder (61) that passes through the surface of the cross shaft (1). A second sealing cap (62) is fixedly connected to the inner wall of one end of the storage cylinder (61). A movable circular plate (63) is provided in the storage cylinder (61). An oil inlet (4) is provided on the storage cylinder (61). The initial position of the circular plate (63) is above the oil inlet (4). Lubricating grease is filled between the circular plate (61) and the second sealing cap (62). Two vertical rods (64) that pass through the side wall of the circular plate (63) are fixedly connected to the inner top of the storage cylinder (61). Two through holes (65) are provided on the second sealing cap (62). The storage cylinder (61) and the protective cylinder (51) are arranged symmetrically.

2. A cardan shaft bearing according to claim 1, characterized in that: The rotating assembly (7) includes a rotating shaft (71) disposed inside the cross shaft (1). The two ends of the rotating shaft (71) pass through the first sealing cover (53) and the second sealing cover (62) respectively and extend into the protective cylinder (51) and the storage cylinder (61). Multiple magnetic columns (72) matching the electromagnetic column (52) are arranged in a ring array on the surface of the rotating shaft (71). The connection between the first sealing cover (53) and the second sealing cover (62) is provided with a first bearing (73). The rotating shaft (71) is threadedly connected to the circular plate (63) through a reciprocating thread (74).

3. A cardan shaft bearing according to claim 2, characterized in that: The transmission assembly (8) includes two turbine blades (81) coaxially fixedly connected to the side wall of a rotating shaft (71). A collar (82) is coaxially fixedly connected to the side wall of the rotating shaft (71). Two symmetrical scraper rods (83) are fixedly connected to the side wall of the collar (82). One end of each of the two scraper rods (83) is located below the through hole (65). The lower end face of the second sealing cover (62) is provided with two second bearings (84). Each of the two second bearings (84) is rotatably connected to a friction cylinder (85) that is in contact with the two scraper rods (83).

4. A cardan shaft bearing according to claim 3, characterized in that: The heat-conducting component (9) includes a heat-conducting box (91) fixedly connected to the cross shaft (1). Multiple first copper pillars (92) connected to the cross shaft (1) are fixedly connected to the side wall of the heat-conducting box (91). A copper plate (93) is fixedly connected to one end of each of the multiple first copper pillars (92). The copper plate (93) is located inside the heat-conducting box (91).

5. A cardan shaft bearing according to claim 4, characterized in that: The cooling assembly (10) includes multiple second copper pillars (101) disposed in a heat-conducting box (91). A coolant column (103) is fixedly connected to the bottom of the heat-conducting box (91). The coolant column (103) is filled with coolant. The two ends of the multiple second copper pillars (101) are respectively connected to the coolant column (103) and the copper plate (93). The surface of the heat-conducting box (91) is provided with multiple heat dissipation holes (102).

6. A cardan shaft bearing according to claim 5, characterized in that: The heat dissipation assembly (11) includes a crossbar (111) fixedly connected to the side wall of the heat conduction box (91). One end of the crossbar (111) is fixedly connected to a breathing box (112). The inner side wall of the breathing box (112) is provided with a groove (113). A slider (114) is slidably connected in the groove (113). A movable bead (115) is fixedly connected to the side wall of the slider (114). The side wall of the breathing box (112) is provided with two symmetrical openings (116). A breathing plate (117) is provided through each of the two openings (116). A spring connected to the breathing plate (117) is fixedly connected to the inner side wall of the opening (116). A connecting plate (118) is provided between the two breathing plates (117). The connecting plate (118) is located on one side of the slider (114).

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