Sealed cross shaft universal joint for passenger car

Abstract

The utility model relates to the technical field of cross shafts, and discloses a sealing cross shaft universal joint for a passenger car, which comprises a cross shaft body, a shaft neck, a shaft sleeve and a roller pin rotationally arranged between the shaft sleeve and the shaft neck, two symmetrically arranged protective half shells are sleeved outside the cross shaft body, a fixing hole is formed in the diagonal position of any protective half shell, and the shaft neck is sleeved outside the shaft sleeve. Fixing holes are formed in the shaft neck, fixing rods used in cooperation with the fixing holes are arranged at the other two opposite angle positions of each protection half shell, a through oil injection opening is formed in any protection half shell and used for injecting grease into an inner cavity of the corresponding protection half shell, a first oil seal is further arranged on the shaft neck and is an external C-shaped oil seal, and a second oil seal is arranged on the shaft neck and is used for sealing the outer C-shaped oil seal. The second oil seal is arranged at the position of an inner port of the shaft sleeve and is a built-in star-shaped oil seal, the first oil seal and the second oil seal are used for preventing impurities from entering and lubricating oil from flowing out, and the problems that existing equipment is prone to being damaged by the impurities in the external environment, and lubricating oil is prone to leaking are solved.

Description

Technical Field

[0001] This utility model relates to the field of cross shaft technology, specifically a sealed cross shaft universal joint for passenger vehicles. Background Technology

[0002] Universal joints, also known as universal joints, are mechanical components that enable variable-angle power transmission. They are used in locations where the direction of the drive shaft needs to be changed, and they are the "joint" components of the universal joint transmission device in automotive drive systems. The combination of a universal joint and a drive shaft is called a universal joint drive unit. Common universal joint drive units generally consist of a universal joint, an oil seal, needle rollers, and a bushing. The current assembly method involves direct contact between the end of the bushing and the end of the needle roller. Due to machining errors, there is a gap between the end face of the needle roller and the end face of the bushing, resulting in uneven contact. This causes friction between the end faces of the needle roller and the end face of the bushing, and increases the resistance of the needle roller movement. After long-term operation, this will affect the service life of the universal joint.

[0003] Chinese utility model patent CN217784055U discloses a long-life universal joint cross shaft, including a cross shaft, an oil seal, needle rollers, a bushing, and a lubricating ring. The cross shaft has multiple journals, and a bushing is provided at each of the multiple journals. The end face of the journal and the end face of the bushing are in contact. A lubricating ring is provided on the end face of the bushing. Needle rollers are provided on one side of the lubricating ring and are evenly distributed inside the bushing. An oil seal is provided on one side of the needle rollers. The oil seal includes a bracket and a sealing ring. The sealing ring and the bracket are fitted together, and the bracket is embedded in the opening of the bushing. By adding a lubricating ring to the end face of the bushing and the end face of the needle rollers, the friction between the end face of the needle rollers and the end face of the bushing is delayed, thereby extending the service life of the universal joint cross shaft. The cavity formed by multiple sealing flaps seals the bushing, preventing the leakage of the lubricating medium inside the bushing and keeping the inside of the bushing in a state of full lubrication. Therefore, when the universal joint cross shaft is running, the rotation of the universal joint cross shaft will not be affected by dry friction of the needle rollers.

[0004] During use, this device suffers from problems such as a simple sealing structure, insufficient protection, and inconvenient maintenance, which can easily lead to the intrusion of impurities, leakage of lubricating oil, and wear of components. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a sealed cross shaft universal joint for passenger vehicles, which has the advantages of multiple protections and solves the problems of existing equipment being easily damaged by impurities in the external environment and easy leakage of lubricating oil.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sealed cross-shaft universal joint for passenger vehicles, comprising a cross-shaft body, journals fixedly connected around the circumference of the cross-shaft body, a bushing fitted on the outer side of the journals, and rotatable needle rollers provided on the inner wall of the bushing, the needle rollers rotating between the inner wall of the bushing and the outer side of the journals.

[0009] The cross shaft body is externally fitted with two symmetrically arranged protective half-shells. Each protective half-shell has a fixing hole at a diagonal position, and the other two diagonal positions of the protective half-shell have fixing rods that cooperate with the fixing holes. Each of the protective half-shells has a through-hole for injecting grease into the cavity inside the protective half-shell. The journal is also provided with a first oil seal, which is an external C-type oil seal. The shaft sleeve has a second oil seal at its internal port position, which is an internal star-shaped oil seal. The first and second oil seals are used to prevent impurities from entering and lubricating oil from flowing out.

[0010] Preferably, a groove is provided at the inner port position of the bushing, the second oil seal is disposed inside the groove, and a sealing ring is provided between the first oil seal and the second oil seal. The sealing ring is disposed inside the bushing, and the outer peripheral surface of the sealing ring is fitted with the inner wall of the bushing, and the inner peripheral surface of the sealing ring is fitted with the outer wall of the journal.

[0011] Preferably, an adsorption block integral with the bushing is fixedly provided on the bottom surface of the bushing away from the opening. The adsorption block is made of magnetic material and is used to adsorb ferromagnetic abrasive particles in the lubricating oil to prevent the abrasive particles from circulating and wearing the parts.

[0012] Preferably, the outer diameter lip of the first oil seal is pressed and sealed against the end face of the bushing, the inner diameter lip of the first oil seal is disposed on the outer wall of the journal and pressed and sealed against the inner wall at the break of the bushing, the surface of the first oil seal near the cross shaft body is press-fitted and sealed against the step of the cross shaft body, the two outer diameter lips of the second oil seal are pressed and sealed against the inner wall of the groove, and the inner diameter lip of the second oil seal is pressed and sealed against the outer wall of the journal.

[0013] Preferably, the surface of the adsorption block is provided with an oil lubrication groove, which is used to store more lubricating oil.

[0014] Preferably, the sealing ring is made of an elastic material with an O-shaped cross-section, forming multiple sealing lines inside the bushing to further improve the sealing effect.

[0015] Preferably, the sealing ring is hollow inside, and an absorbent material is placed inside the sealing ring, and the sealing ring has vent holes.

[0016] Preferably, the first oil seal has an annular groove inside, and reinforcing ribs are placed inside the annular groove to strengthen and enhance the oil seal's resistance to deformation.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a sealed cross shaft universal joint for passenger vehicles, which has the following advantages:

[0019] 1. This sealed cross-shaft universal joint for passenger vehicles achieves flexible rotation and convenient maintenance by setting journals around the cross-shaft body and fitting bushings with needle rollers on the outer side of the journals. It also employs two symmetrically arranged protective half-shells with oil inlets, fixing holes, and fixing rods. The cooperation between the journals and needle rollers reduces frictional resistance during rotation, making power transmission smoother and more efficient. The design of the protective half-shells not only provides physical protection for the internal structure, preventing damage to components from external hard objects, but also allows for periodic grease injection through the oil inlets, ensuring lubrication and extending service life. The cooperation between the fixing holes and fixing rods facilitates the installation and removal of the protective half-shells, reducing maintenance difficulty and time costs, and improving the working stability, reliability, and maintenance convenience of the universal joint.

[0020] 2. This passenger vehicle sealed cross shaft universal joint achieves multiple sealing protections by setting an external C-type first oil seal and an internal star-type second oil seal, with an elastic O-ring sealing ring between them. This further prevents impurities from entering and lubricating oil from flowing out. The sealing ring forms multiple sealing defenses inside the bushing, enhancing the sealing effect. Furthermore, absorbent material is placed inside the sealing ring to absorb spilled lubricating oil and flowing-in impurities. This combined sealing structure effectively prevents dust, mud, and other impurities from entering the universal joint, avoiding wear on components such as journals and needle rollers. At the same time, it prevents lubricating oil leakage, ensuring that all components are always in a good lubrication state, thereby improving the sealing performance of the universal joint, extending its service life, and ensuring transmission performance.

[0021] 3. This type of sealed cross shaft universal joint for passenger vehicles achieves the adsorption of ferromagnetic abrasive particles in lubricating oil and increases the storage capacity of lubricating oil by setting an adsorption block made of magnetic material with oil lubrication grooves on the bottom surface of the bushing. The adsorption block can actively adsorb ferromagnetic abrasive particles generated by component wear in the lubricating oil, preventing these abrasive particles from causing secondary wear on components such as journals and needle rollers during lubricating oil circulation, thus reducing component wear. The design of the oil lubrication groove increases the storage space of lubricating oil, so that the components can continuously receive sufficient lubrication during operation, reducing the risk of wear caused by insufficient lubrication. At the same time, the oil lubrication groove can store the ferromagnetic abrasive particles adsorbed by the adsorption block, ensuring the normal operation of the universal joint, thereby achieving the effect of reducing component wear and improving the reliability and stability of the universal joint. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the isometric cross-section of the top view of the structure of this utility model.

[0024] Figure 3 This is a frontal cross-sectional view of the structure of this utility model.

[0025] Figure 4 This is a schematic cross-sectional view of the structure of this utility model from the top view.

[0026] Figure 5 This is an exploded view of the structure of this utility model.

[0027] Figure 6 This is a schematic diagram of the isometric cross-section of the top view of the structure of this utility model after an explosion.

[0028] Figure 7 This is a schematic diagram of the top cross-section of the structure of this utility model after an explosion.

[0029] Figure 8 This is an isometric cross-sectional view of the structure of this utility model after an explosion.

[0030] In the diagram: 100, cross shaft body;

[0031] 200. Journal;

[0032] 300, bushing; 310, needle roller; 320, groove; 330, suction block; 340, oil lubrication groove;

[0033] 410. First oil seal; 411. Reinforcing rib; 420. Second oil seal; 430. Sealing ring;

[0034] 500, Protective half shell; 510, Fixing hole; 520, Fixing rod; 530, Oil filling port. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Example 1:

[0040] This embodiment provides a sealed cross shaft universal joint for passenger vehicles, which has the following technical features.

[0041] Please see Figure 1-8 A sealed cross-shaped universal joint for passenger vehicles includes a cross-shaped shaft body 100, journals 200 fixedly connected around the cross-shaped shaft body 100, a bushing 300 fitted on the outer side of the journals 200, and rotatable needle rollers 310 provided on the inner wall of the bushing 300. The needle rollers 310 rotate between the inner wall of the bushing 300 and the outer side of the journals 200.

[0042] The cross shaft body 100 is fitted with two symmetrically arranged protective half-shells 500. Each protective half-shell 500 has a fixing hole 510 at a diagonal position, and the other two diagonal positions of the protective half-shell 500 have fixing rods 520 that cooperate with the fixing holes 510. Each protective half-shell 500 has a through oil inlet 530 for injecting grease into the cavity inside the protective half-shell 500. The journal 200 is also provided with a first oil seal 410, which is an external C-type oil seal. The shaft sleeve 300 has a second oil seal 420 at the internal port position, which is an internal star-shaped oil seal. The first oil seal 410 and the second oil seal 420 are used to prevent impurities from entering and lubricating oil from flowing out.

[0043] In an optional embodiment, a groove 320 is provided at the internal port position of the bushing 300, a second oil seal 420 is disposed inside the groove 320, and a sealing ring 430 is provided between the first oil seal 410 and the second oil seal 420. The sealing ring 430 is disposed inside the bushing 300, and the outer peripheral surface of the sealing ring 430 is fitted with the inner wall of the bushing 300, and the inner peripheral surface of the sealing ring 430 is fitted with the outer wall of the journal 200.

[0044] In an optional embodiment, an adsorption block 330 integrally formed with the bushing 300 is fixedly provided on the bottom surface of the bushing 300 away from the opening. The adsorption block 330 is made of magnetic material and is used to adsorb ferromagnetic abrasive particles in the lubricating oil to prevent the abrasive particles from circulating and wearing the parts.

[0045] In an optional embodiment, the outer diameter lip of the first oil seal 410 is pressed and sealed against the port face of the bushing 300, the inner diameter lip of the first oil seal 410 is disposed on the outer wall of the journal 200 and pressed and sealed against the inner wall at the break of the bushing 300, the surface of the first oil seal 410 near the cross shaft body 100 is press-fitted and sealed against the step of the cross shaft body 100, the two outer diameter lips of the second oil seal 420 are pressed and sealed against the inner wall of the groove 320, and the inner diameter lip of the second oil seal 420 is pressed and sealed against the outer wall of the journal 200.

[0046] In an optional embodiment, the surface of the adsorption block 330 is provided with an oil lubrication groove 340 for storing more lubricating oil.

[0047] In an optional embodiment, the sealing ring 430 is made of an elastic material with an O-shaped cross-section, forming multiple sealing lines inside the bushing 300 to further enhance the sealing effect.

[0048] In an optional embodiment, the interior of the sealing ring 430 is hollow, and an absorbent material is placed inside the sealing ring 430. The sealing ring 430 has ventilation holes.

[0049] In an optional embodiment, the first oil seal 410 has an annular groove inside, and a reinforcing rib 411 is placed inside the annular groove to strengthen and enhance the oil seal's resistance to deformation.

[0050] Working principle: First, the needle roller 310 is placed against the inner wall of the bushing 300, allowing the journal 200 to rotate freely within the bushing 300 via the needle roller 310. Next, a first oil seal 410 is installed on the journal 200, with its face near the cross shaft body 100 interference-fitted with the step of the cross shaft body 100. A second oil seal 420 is installed in the groove 320 at the inner port of the bushing 300. A sealing ring 430 is placed between the first oil seal 410 and the second oil seal 420. Relying on its elasticity and O-shaped cross-section, multiple sealing lines are constructed inside the bushing 300. Then, the bushing 300 is fitted onto the journal 200. At this point, the outer diameter lip of the first oil seal 410 is pressed against the port face of the bushing 300, and the inner diameter lip is pressed against the outer wall of the journal 200 and the inner wall at the break point of the bushing 300, forming a... The device employs a multi-stage sealing system, with the sealing ring 430 hollow in the middle. An absorbent material, such as activated carbon fiber, is placed inside the sealing ring 430 to absorb incoming impurities and overflowing lubricating oil. Simultaneously, an adsorption block 330 is fixedly installed on the bottom surface of the bushing 300 away from the port, which magnetically adsorbs ferromagnetic abrasive particles in the lubricating oil. The oil groove 340 on the surface can store lubricating oil and collect iron filings generated during the movement of the bushing 300. Finally, two protective half-shells 500 are symmetrically fitted onto the cross shaft body 100 through fixing rods 520 and fixing holes 510, and grease is injected through the oil inlet 530, keeping the entire device in an oil-sealed state and better preventing oxidation and damage from external mud and sand.

[0051] In summary, this sealed cross shaft universal joint for passenger vehicles achieves flexible rotation and convenient maintenance by setting journals 200 around the cross shaft body 100 and fitting bushings 300 with needle rollers 310 on the outside of the journals 200, and employing two symmetrically arranged protective half-shells 500 with oil inlets 530, fixing holes 510, and fixing rods 520. The cooperation between the journals 200 and the needle rollers 310 reduces frictional resistance during rotation, making power transmission smoother and more efficient. The design of the protective half-shells 500 not only provides physical protection for the internal structure, preventing damage to components from external hard objects, but also allows for periodic grease injection through the oil inlets 530, ensuring lubrication and extending service life. The cooperation between the fixing holes 510 and the fixing rods 520 facilitates the installation and removal of the protective half-shells 500, reducing maintenance difficulty and time costs, and achieving the effect of improving the working stability, reliability, and maintenance convenience of the universal joint.

[0052] This passenger vehicle sealed cross shaft universal joint achieves multiple sealing protections by setting an external C-type first oil seal 410 and an internal star-shaped second oil seal 420, with an elastic O-ring 430 between them. This further prevents impurities from entering and lubricating oil from flowing out. The sealing ring 430 forms multiple sealing lines inside the bushing 300, enhancing the sealing effect. Furthermore, an absorbent material is placed inside the sealing ring 430 to absorb spilled lubricating oil and infiltrated impurities. This combined sealing structure effectively prevents dust, mud, and other impurities from entering the universal joint, avoiding wear on components such as the journal 200 and needle roller 310. At the same time, it prevents lubricating oil leakage, ensuring that all components are always in a good lubrication state, thereby improving the sealing performance of the universal joint, extending its service life, and ensuring transmission performance.

[0053] This passenger vehicle sealed universal joint utilizes an adsorption block 330 made of magnetic material with an oil lubrication groove 340 on the bottom surface of the bushing 300. This adsorption block 330 effectively adsorbs ferromagnetic abrasive particles in the lubricating oil and increases the amount of lubricating oil stored. The adsorption block 330 actively adsorbs ferromagnetic abrasive particles generated by component wear in the lubricating oil, preventing these particles from causing secondary wear on components such as the journal 200 and needle roller 310 during lubricating oil circulation, thus reducing component wear. The design of the oil lubrication groove 340 increases the storage space for lubricating oil, ensuring that components receive sufficient lubrication continuously during operation. This reduces the risk of wear due to insufficient lubrication. At the same time, the oil lubrication groove can store the ferromagnetic abrasive particles adsorbed by the adsorption block 330, ensuring the normal operation of the universal joint. This achieves the effects of reducing component wear and improving the reliability and stability of the universal joint.

[0054] 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.

[0055] 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 sealed cross-shaft universal joint for passenger vehicles, comprising a cross-shaft body (100), wherein journals (200) are fixedly connected around the cross-shaft body (100), a bushing (300) is fitted onto the outer side of the journals (200), and a rotatable needle roller (310) is provided on the inner wall of the bushing (300), the needle roller (310) rotating between the inner wall of the bushing (300) and the outer side of the journal (200), characterized in that, The cross shaft body (100) is fitted with two symmetrically arranged protective half shells (500). Each protective half shell (500) has a fixing hole (510) at a diagonal position, and the other two diagonal positions of the protective half shell (500) are provided with fixing rods (520) that cooperate with the fixing holes (510). Each of the protective half shells (500) has a through oil injection port (530) for injecting grease into the cavity inside the protective half shell (500). The journal (200) is also provided with a first oil seal (410), which is an external C-type oil seal. The sleeve (300) is provided with a second oil seal (420) at its internal port position, which is an internal star-shaped oil seal. The first oil seal (410) and the second oil seal (420) are used to prevent impurities from entering and lubricating oil from flowing out.

2. The sealed cross-shaped universal joint for passenger vehicles according to claim 1, characterized in that, A groove (320) is provided at the inner port of the bushing (300). The second oil seal (420) is disposed inside the groove (320). A sealing ring (430) is provided between the first oil seal (410) and the second oil seal (420). The sealing ring (430) is disposed inside the bushing (300). The outer circumferential surface of the sealing ring (430) is fitted with the inner wall of the bushing (300). The inner circumferential surface of the sealing ring (430) is fitted with the outer wall of the journal (200).

3. The sealed cross-shaped universal joint for passenger vehicles according to claim 1, characterized in that, An adsorption block (330) integral with the bushing (300) is fixedly provided on the bottom surface away from the opening. The adsorption block (330) is made of magnetic material and is used to adsorb ferromagnetic abrasive particles in the lubricating oil to prevent the abrasive particles from circulating and wearing the parts.

4. A sealed cross-shaped universal joint for passenger vehicles according to claim 2, characterized in that, The outer diameter lip of the first oil seal (410) is pressed and sealed with the port face of the bushing (300). The inner diameter lip of the first oil seal (410) is set on the outer wall of the journal (200) and pressed and sealed with the inner wall at the break of the bushing (300). The surface of the first oil seal (410) near the cross shaft body (100) is press-fitted and sealed with the step of the cross shaft body (100). The two outer diameter lips of the second oil seal (420) are pressed and sealed with the inner wall of the groove (320). The inner diameter lip of the second oil seal (420) is pressed and sealed with the outer wall of the journal (200).

5. A sealed cross-shaped universal joint for passenger vehicles according to claim 3, characterized in that, The surface of the adsorption block (330) is provided with an oil lubrication groove (340), which is used to store more lubricating oil.

6. A sealed cross-shaped universal joint for passenger vehicles according to claim 2, characterized in that, The sealing ring (430) is made of elastic material and has an O-shaped cross-section. It forms multiple sealing lines inside the bushing (300) to further improve the sealing effect.

7. A sealed cross-shaped universal joint for passenger vehicles according to claim 2, characterized in that, The sealing ring (430) is hollow inside, and an absorbent material is placed inside the sealing ring (430). The sealing ring (430) has ventilation holes.

8. A sealed cross-shaped universal joint for passenger vehicles according to claim 1, characterized in that, The first oil seal (410) has an annular groove inside, and a reinforcing rib (411) is placed inside the annular groove to strengthen the oil seal's resistance to deformation.

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