Cross shaft universal joint

Abstract

The utility model relates to the technical field of automobile part production, and discloses a cross shaft universal joint which comprises a cross shaft main body, a shaft body is fixedly arranged on the cross shaft main body, a shaft sleeve is sleeved on the outer side of the shaft body, a roller pin is arranged inside the shaft sleeve, an oil seal is sleeved on the shaft body, and the oil seal is sleeved on the shaft body. The universal joint pin is characterized in that an oil injection port is formed in the universal joint pin body, an oil guide pipe groove penetrating transversely is formed in the pin body, the oil guide pipe groove is communicated with the oil injection port, an oil guide mechanism is arranged between the oil injection port and the oil guide pipe groove, and the oil guide mechanism is used for injecting oil between the pin body and the pin sleeve. The service life of the cross shaft is prolonged, the problem that according to an existing device, lubricating oil needs to be added into a shaft sleeve after the shaft sleeve and a shaft body are detached is solved, and the oil injection time and steps are reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, specifically a cross-shaped universal joint. Background Technology

[0002] A universal joint cross shaft is an automotive universal joint component that enables variable-angle power transmission. It is used in locations where the direction of the drive shaft needs to be changed. It is the "joint" component of the universal joint transmission device in a car's drive system. The combination of a universal joint cross shaft and a drive shaft is called a universal joint cross shaft transmission device. In front-engine, rear-wheel-drive vehicles, the universal joint cross shaft transmission device is installed between the transmission output shaft and the drive axle final drive input shaft; while in front-engine, front-wheel-drive vehicles, the drive shaft is omitted, and the universal joint cross shaft is installed between the front axle half-shaft, which is responsible for both drive and steering, and the wheels. Existing universal joint cross shafts have gaps between the bushing and the shaft end during use, resulting in poor sealing. Over time, dust easily accumulates in these gaps, forming dirt that affects the rotation of the universal joint.

[0003] Chinese utility model patent CN219692054U discloses a high-sealing universal joint assembly. By setting a fastening mechanism, the sliding plate can push the fastening plate to the side closer to the universal sleeve through the connecting column, so that the fastening plate contacts the universal sleeve through the sealing gasket connected on the inner side, and achieves a fastening and sealing effect at the connection between the universal joint head and the universal sleeve, preventing external dust from entering after long-term use. In addition, by setting a push-off component, the push plate pushes the sliding plate to the side away from the universal sleeve through the connecting plate, so that the fastening plate is away from the side of the universal sleeve, which facilitates the subsequent disassembly of the universal sleeve.

[0004] During use, the crosshead and bearing will wear out due to prolonged rotation. It is necessary to remove the device and add lubricating oil to the inside of the bushing to reduce wear on the crosshead and bearing. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a cross-shaped universal joint, which has the advantage of making it easy to add lubricating oil to the inside of the bushing, thus solving the problem of difficulty in adding lubricating oil to existing parts.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a universal joint with a cross shaft, comprising a cross shaft body, a shaft fixedly mounted on the cross shaft body, a bushing fitted on the outer side of the shaft body, a needle roller disposed inside the bushing, and an oil seal fitted on the shaft body. The cross shaft body is characterized by having an oil inlet on it, a transversely penetrating oil guide groove on the shaft body, the oil guide groove communicating with the oil inlet, and an oil guiding mechanism disposed between the oil inlet and the oil guide groove. The oil guiding mechanism is used to inject oil between the shaft body and the bushing, thereby extending the service life of the cross shaft.

[0009] Preferably, the oil guiding mechanism includes: a mounting groove formed on the cross shaft body; a column fixed inside the mounting groove; the bottom of a spring fixedly disposed at the bottom of the mounting groove, with the spring sleeved around the periphery of the column; a sealing ring fixedly connected to the top of the spring; a sealing plug fixedly connected above the sealing ring via a connecting rod; an air bladder disposed between the sealing ring and the sealing plug; the top of the sealing plug sealingly disposed with the oil inlet; the outer side of the air bladder fixedly connected to the inner wall of the mounting groove; the connecting rod disposed inside the air bladder; and a limit groove formed on the inner wall of the mounting groove below the sealing ring.

[0010] Preferably, a double-layer retainer is fixedly provided inside the bushing, and a connecting shaft is fixedly provided at both ends of the needle roller. The connecting shaft rotates in the rotating hole of the retainer, and the two ends of the needle roller are rotatably mounted on the double-layer retainer through the connecting shaft.

[0011] Preferably, there is a gap between the inner wall of the retainer on the side away from the bushing and the shaft body, and the diameter of the needle roller is larger than the width of the retainer, and the needle roller is rolled in close contact with the shaft body.

[0012] Preferably, the diameter of the sealing ring is equal to the diameter of the mounting groove, the diameter of the limiting groove is greater than the diameter of the mounting groove, the diameter of the top of the sealing plug is equal to the diameter of the oil inlet, the diameter of the bottom of the sealing plug is less than the diameter of the mounting groove but greater than the diameter of the oil inlet, and the diameter of the limiting groove is greater than the diameter of the sealing ring.

[0013] Preferably, the sealing plug has a sliding hole at one end near the column that is slidably disposed with the column.

[0014] Preferably, the top of the mounting groove is provided with an annular groove, and the sealing plug is provided with a sealing ring that cooperates with the annular groove.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a cross-shaped universal joint, which has the following beneficial effects:

[0017] 1. This type of universal joint features an oil inlet on the universal joint body and a transversely extending oil guide groove inside the shaft body. The oil inlet distributes lubricating oil into each oil guide groove, which in turn distributes the lubricating oil between the bushings and the shaft body. A mounting groove connects the oil inlet and the oil guide groove. Inside the mounting groove, a column and the bottom of a spring are fixedly mounted. The spring is fitted onto the outside of the column, and a sealing ring is fixedly connected to the top of the spring. A sealing plug is fixedly connected to the sealing ring via a connecting rod. Pressing the sealing plug injects lubricating oil into the oil guide groove. Releasing the pressure causes the spring to seal the sealing plug against the oil inlet, preventing the lubricating oil from flowing out.

[0018] 2. This type of universal joint for cross shafts has a double-layer cage inside the bushing, with a rotating hole on the double-layer cage. The two ends of the needle rollers are provided with detachable connecting shafts, which are respectively set inside the rotating hole of the double-layer cage. This can reduce the friction between multiple needle rollers, thereby reducing the consumption of needle rollers and the generation of heat inside the bearing, thus extending the service life of the entire device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure and assembly of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of this utility model.

[0021] Figure 3 This is a cross-sectional view of the bushing and shaft body of this utility model after disassembly.

[0022] Figure 4 This is a cross-sectional view of the structure of this utility model after some parts have been disassembled and reassembled.

[0023] Figure 5 This is a schematic diagram of the structure of the present invention after the oil inlet and the oil guide groove are provided.

[0024] Figure 6 This is a schematic diagram of the structure of the present invention after the oil inlet and the oil guide groove are provided.

[0025] Figure 7 This is a cross-sectional view of the structure of this utility model after the oil injection structure has been provided.

[0026] Figure 8 This is a cross-sectional view of the structure of this utility model after the oil injection structure has been provided.

[0027] In the diagram: 100, cross shaft body; 110, oil inlet; 111, mounting groove; 112, column; 113, spring; 114, limiting groove; 115, sealing ring; 116, air bladder; 117, sealing plug; 118, annular groove; 119, sealing ring; 120, connecting rod; 200, shaft body; 210, oil guide groove; 300, bushing; 320, needle roller; 321, cage; 410, oil seal. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Example 1:

[0033] This embodiment provides a cross-shaped universal joint, which has the following technical features.

[0034] Please see Figure 1-8A universal joint for cross shafts includes a cross shaft body 100, a shaft 200 fixedly mounted on the cross shaft body 100, a bushing 300 fitted on the outer side of the shaft 200, a needle roller 320 disposed inside the bushing 300, and an oil seal 410 fitted on the shaft 200. The cross shaft body 100 has an oil inlet 110, and the shaft 200 has a transversely penetrating oil guide groove 210 connected to the oil inlet 110. An oil guiding mechanism is provided between the oil inlet 110 and the oil guide groove 210, and the oil guiding mechanism is used to inject oil between the shaft 200 and the bushing 300 to extend the service life of the cross shaft.

[0035] The oil guiding mechanism further includes: a mounting groove 111, which is formed on the cross shaft body 100; a column 112 is fixed inside the mounting groove 111; the bottom of a spring 113 is also fixedly set at the bottom of the mounting groove 111, and the spring 113 is sleeved around the periphery of the column 112; a sealing ring 115 is fixedly connected to the top of the spring 113; a sealing plug 117 is fixedly connected above the sealing ring 115 via a connecting rod 120; an airbag 116 is set between the sealing ring 115 and the sealing plug 117; the top of the sealing plug 117 is sealed to the oil filling port 110; the outer side of the airbag 116 is fixedly connected to the inner wall of the mounting groove 111; the connecting rod 120 is set inside the airbag 116; and a limit groove 114 is formed on the inner wall of the mounting groove 111 below the sealing ring 115.

[0036] Furthermore, a double-layer retainer 321 is fixedly installed inside the bushing 300, and a connecting shaft is fixedly installed at both ends of the needle roller 320. The connecting shaft rotates in the rotating hole of the retainer 321, and the two ends of the needle roller 320 are rotatably mounted on the double-layer retainer 321 through the connecting shaft.

[0037] Furthermore, a gap is left between the inner wall of the retainer 321 on the side away from the bushing 300 and the shaft 200, and the diameter of the needle roller 320 is larger than the width of the retainer 321, so that the needle roller 320 is rolled in close contact with the shaft 200.

[0038] Furthermore, the diameter of the sealing ring 115 is equal to the diameter of the mounting groove 111, the diameter of the limiting groove 114 is greater than the diameter of the mounting groove 111, the diameter of the top of the sealing plug 117 is equal to the diameter of the oil filling port 110, the diameter of the bottom of the sealing plug 117 is smaller than the diameter of the mounting groove 111 but larger than the diameter of the oil filling port 110, and the diameter of the limiting groove 114 is greater than the diameter of the sealing ring 115.

[0039] Furthermore, the sealing plug 117 has a sliding hole at one end near the column 112 that is slidably disposed with the column 112.

[0040] Furthermore, the top of the mounting groove 111 is provided with an annular groove 118, and a sealing ring 119 is provided on the sealing plug 117 to cooperate with the annular groove 118.

[0041] Working principle: A shaft body 200 is fixedly installed around the cross shaft body 100. A bushing 300 is fitted on the outside of the shaft body 200. An oil seal 410 is installed at the connection between the cross shaft body 100 and the shaft body 200. The oil seal 410 can prevent external dust from entering the bushing 300. A needle roller 320 is installed inside the bushing 300. The needle roller 320 is rotatably installed between the inner wall of the bushing 300 and the outer side of the shaft body 200. A detachable connecting shaft is provided at both ends of the needle roller 320. A double-layer retainer 321 is fixedly installed on the inner wall of the bushing 300. The retainer 321 has a through rotating hole. The two ends of the needle roller 320 are rotatably installed inside the rotating hole through the connecting shaft. Thus, the bushing 300 and the shaft body... When relative rotation occurs between the 200 rollers, the friction between the needle rollers 320 is reduced, thereby extending the service life of the needle rollers 320 and reducing the heat generated during friction, thus prolonging the service life of the lubricating oil. Meanwhile, an oil inlet 110 is provided on one side of the cross shaft body 100, and a mounting groove 111 is provided below the oil inlet 110. A transversely penetrating oil guide groove 210 is also provided on the shaft body 200 around the mounting groove 111. Inside the mounting groove 111, a column 112 and the bottom of a spring 113 are vertically fixed. The spring 113 is fitted onto the outside of the column 112, and a sealing ring 115 is fixedly connected to the top of the spring 113. The sealing ring 115 slides on the outside of the column 112, and the upper part of the sealing ring 115... A connecting rod 120 is fixedly connected to the surface, and a sealing plug 117 is fixedly connected to the top of the connecting rod 120. The top frustum of the sealing plug 117 slides in contact with the oil inlet 110, and the diameter of the bottom frustum of the sealing plug 117 is smaller than the diameter of the mounting groove 111. An air bladder 116 is provided between the sealing plug 117 and the sealing ring 115. The side of the air bladder 116 closest to the inner wall of the mounting groove 111 is fixedly embedded in the inner wall of the mounting groove 111. When the spring 113 is fully released, the sealing plug 117 is positioned inside the oil inlet 110, while the bottom of the air bladder 116 is closely fitted with the upper surface of the sealing ring 115. A limiting groove 114 is provided on the inner wall of the mounting groove 111 below the sealing ring 115, so that when the sealing plug 117 is pressed, the spring 113 will... During deformation, when the sealing ring 115 is pressed into the limiting groove 114, because the diameter of the sealing ring 115 is smaller than the diameter of the limiting groove 114, when oil is injected into the oil filling port 110, the lubricating oil flows along the oil filling port 110 into the gap between the inner wall of the mounting groove 111 and the lower truncated cone of the sealing plug 117, then into the gap between the air bag 116 and the connecting rod 120, and then into the gap between the sealing ring 115 and the inner wall of the limiting groove 114. Finally, it flows to the bottom of the mounting groove 111 and into each oil guide groove 210, distributing to each bushing 300 and shaft body 200 for lubrication. After the oil injection is completed, the pressure on the sealing plug 117 is released, and under the elastic force of the spring 113, the sealing plug 117 seals with the oil filling port 110.The sealing ring 115 seals against the inner wall of the mounting groove 111, and the airbag 116 seals against the sealing ring 115. This triple seal protects the lubricating oil from leakage. Simultaneously, after the device generates significant heat during operation, the lubricating oil temperature rises, causing the air inside the airbag 116 to heat up. This causes the airbag 116 to expand, increasing the pressure between it and the sealing ring 115, thus improving the sealing effect. Furthermore, an annular groove 118 is provided at the top of the mounting groove 111, and a sealing ring 119 is fixedly mounted on the upper surface of the lower frustum of the sealing plug 117. When the sealing plug 117 is fixed inside the oil inlet 110, the sealing ring 119 seals against the annular groove 118, further ensuring that the lubricating oil does not leak.

[0042] In summary, this type of universal joint features an oil inlet 110 on the universal joint body 100 and a transversely extending oil guide groove 210 inside the shaft body 200. The oil inlet 110 distributes lubricating oil into each oil guide groove 210, which in turn distributes lubricating oil between each bushing 300 and the shaft body 200. Furthermore, an installation groove 111 connects the oil inlet 110 and the oil guide groove 210, allowing the installation groove 111 to... The bottom of the fixed column 112 and spring 113 is fitted with the spring 113 on the outside of the column 112. A sealing ring 115 is fixedly connected to the top of the spring 113. A sealing plug 117 is fixedly connected to the sealing ring 115 through the connecting rod 120. By pressing the sealing plug 117, lubricating oil can be injected into the oil guide groove 210. When the pressing force is released, the spring 113 can drive the sealing plug 117 to seal and fit with the oil injection port 110, thereby preventing the lubricating oil from flowing out.

[0043] In summary, this universal joint with a cross shaft, by providing a double-layer retainer 321 inside the bushing 300, and having a rotating hole on the double-layer retainer 321, and by providing detachable connecting shafts at both ends of the needle rollers 320, and by placing the connecting shafts at both ends inside the rotating holes of the double-layer retainer 321, can reduce the friction between multiple needle rollers 320, thereby reducing the consumption of the needle rollers 320 and reducing the heat generation inside the bearing, thus extending the service life of the entire device.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal joint with a cross shaft, comprising a cross shaft body (100), a shaft body (200) fixedly disposed on the cross shaft body (100), a bushing (300) fitted on the outer side of the shaft body (200), a needle roller (320) disposed inside the bushing (300), and an oil seal (410) fitted on the shaft body (200), characterized in that: The cross shaft body (100) is provided with an oil inlet (110), the shaft body (200) is provided with a transversely penetrating oil guide pipe groove (210), and the oil guide pipe groove (210) is in communication with the oil inlet (110); an oil guide mechanism is arranged between the oil inlet (110) and the oil guide pipe groove (210), and the oil guide mechanism is used for oil injection between the shaft body (200) and the shaft sleeve (300), thereby prolonging the service life of the cross shaft.

2. A cardan joint according to claim 1, characterized in that The oil guide mechanism comprises: An installation groove (111) is arranged on the cross shaft body (100), a stand column (112) is fixed in the installation groove (111), the bottom of the installation groove (111) is further fixedly provided with the bottom of a spring (113), the spring (113) is sleeved with the outer periphery of the stand column (112), the top of the spring (113) is fixedly connected with a sealing ring (115), the sealing ring (115) is fixedly connected with a sealing plug (117) through a connecting rod (120) above the sealing ring (115), an air bag (116) is arranged between the sealing ring (115) and the sealing plug (117), the top of the sealing plug (117) is sealingly arranged with the oil inlet (110), the air bag (116) is fixedly connected to the inner wall of the installation groove (111) outside, the connecting rod (120) is arranged in the air bag (116), and a limiting groove (114) is arranged on the inner wall of the installation groove (111) below the sealing ring (115).

3. A cardan joint according to claim 2, characterized in that The shaft sleeve (300) is fixedly provided with a double-layer retainer (321) inside, the both ends of the needle roller (320) are fixedly provided with connecting shafts, the connecting shafts are rotatably arranged in the rotating holes of the retainer (321), and the both ends of the needle roller (320) are rotatably arranged on the double-layer retainer (321) through the connecting shafts.

4. A constant-velocity joint according to claim 3, wherein The inner wall of the retainer (321) away from the shaft sleeve (300) side and the shaft body (200) are left with a gap, the diameter of the needle roller (320) is greater than the width of the retainer (321), and the needle roller (320) is rotatably arranged in combination with the shaft body (200).

5. A cardan joint according to claim 4, characterized in that The diameter of the sealing ring (115) is equal to the diameter of the installation groove (111), the diameter of the limiting groove (114) is greater than the diameter of the installation groove (111), the diameter of the top of the sealing plug (117) is equal to the diameter of the oil inlet (110), the diameter of the bottom of the sealing plug (117) is smaller than the diameter of the installation groove (111) and greater than the diameter of the oil inlet (110), and the diameter of the limiting groove (114) is greater than the diameter of the sealing ring (115).

6. A cardan joint according to claim 5, characterized in that The end of the sealing plug (117) close to the stand column (112) is provided with a sliding hole in sliding connection with the stand column (112).

7. A cardan joint according to claim 6, characterized in that The top of the installation groove (111) is provided with an annular groove (118), and the sealing plug (117) is provided with a sealing ring (119) arranged in the annular groove (118) for cooperation.

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