Self-lubricating cross universal joint

Abstract

The utility model relates to a self-lubricating cross universal joint, and belongs to the technical field of universal joints, the self-lubricating cross universal joint comprises a cross shaft body and four shaft necks integrated with the cross shaft body, the shaft necks are sleeved with shaft sleeves, roller pins are arranged between the shaft sleeves and the shaft necks, lubricating spaces are formed between the inner side walls of the shaft sleeves and the outer side walls of the shaft necks, and the roller pins are located in the lubricating spaces; an oil storage counter bore is formed in the front end of the journal, lubricating grease is arranged in the oil storage counter bore, a gasket is arranged between the end of the journal and the shaft sleeve, a through hole is formed in the gasket opposite to the oil storage counter bore, a plurality of oil guide grooves are formed in the end face, opposite to the journal, of the gasket, the oil guide grooves are radially and obliquely arranged with the through hole as the center, and the oil guide grooves communicate with the oil storage counter bore and the lubricating space. The universal joint has the self-lubricating function, and it is ensured that sufficient lubricating grease always exists among the roller pin, the shaft neck and the shaft sleeve.

Description

Technical Field

[0001] This utility model relates to the field of universal joint technology, and in particular to a self-lubricating universal joint. Background Technology

[0002] Universal joints, as key components for transmitting power at varying angles, are widely used in automobiles, construction machinery, and other equipment. To ensure their normal operation and extend their service life, lubrication is an essential maintenance step. Currently, the industry commonly uses manual, periodic grease application, injecting grease into the universal joint through a grease fitting or filler hole. The grease forms an oil film to reduce friction between transmission components.

[0003] This traditional lubrication and maintenance method has obvious drawbacks. On the one hand, due to the complex working environment of the universal joint and the numerous and dispersed lubrication points, frequent and short-cycle manual lubrication is required, which consumes a lot of time and energy for operators. On the other hand, manual maintenance relies on the operator's subjective judgment and sense of responsibility. If lubrication is not performed for a long time due to negligence or improper work arrangements, the universal joint will wear out faster due to insufficient lubrication, greatly shortening its service life. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a self-lubricating universal joint.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a self-lubricating universal joint, including a cross shaft body and four journals integrated with the cross shaft body. A bushing is sleeved on the journal, and a needle roller is provided between the bushing and the journal. A lubrication space is formed between the inner side wall of the bushing and the outer side wall of the journal, and the needle roller is located in the lubrication space.

[0006] The journal has an oil reservoir at the front end, which contains grease. A gasket is provided between the journal end and the bushing. The gasket has a through hole opposite the oil reservoir. The end face of the gasket opposite the journal has multiple oil guide grooves. The multiple oil guide grooves are arranged radially and obliquely around the through hole. The oil guide grooves connect the oil reservoir and the lubrication space.

[0007] Furthermore, the gasket is provided with multiple lubrication countersunk holes on the end face of the journal.

[0008] Furthermore, it also includes a dust cover and an oil seal. The dust cover is located between the opening of the bushing and the journal, and the oil seal is located between the dust cover and the needle roller. A retaining ring is provided between the oil seal and the needle roller.

[0009] Furthermore, the oil seal has an oil seal groove filled with lubricating grease.

[0010] Furthermore, the gasket is located between the corresponding end faces of both the journal and the needle roller and the bushing.

[0011] Furthermore, the needle rollers are arranged in two groups in a ring, with 30 needle rollers in each group.

[0012] Furthermore, the oil seal includes a sealing skeleton ring, an outer sealing rubber ring that is nested and bonded to the sealing skeleton ring between the sealing skeleton ring and the shaft sleeve, an inner sealing rubber ring that is inserted into the lower end of the sealing skeleton ring between the sealing skeleton ring and the shaft journal, and a support ring that is snap-fitted and fixed between the outer side of the inner sealing rubber ring and the sealing skeleton ring.

[0013] Furthermore, the outer sealing rubber ring and the inner sealing rubber ring are made as a single piece.

[0014] Furthermore, the gasket is made of nylon material.

[0015] The beneficial effects of this application are as follows: 1. The oil reservoir at the front end of the journal stores grease, and the through holes and radially inclined oil guide grooves on the gasket connect the oil reservoir to the lubrication space. When the universal joint is in operation, the grease can automatically flow into the lubrication space by using centrifugal force and the relative movement between components, providing continuous lubrication for the journal, bushing and needle roller, realizing self-lubrication, effectively reducing friction and wear, and improving transmission efficiency.

[0016] 2. The dust cover, oil seal, and the grease filling the oil seal work together to effectively prevent external dust and impurities from entering and to prevent grease leakage. The special structural design of the oil seal, including an outer sealing rubber ring, an inner sealing rubber ring, and a support ring, enhances the sealing effect, extends the service life of the grease, and ensures that the universal joint can work normally even in harsh environments.

[0017] 3. Excellent self-lubricating and sealing properties reduce component wear, lower the probability of failure, thereby extending the service life of the universal joint and reducing equipment downtime and maintenance costs.

[0018] 4. The needle rollers employ a two-group, ring-shaped distribution with 30 rollers in each group, enabling more even load distribution and improving the load-bearing capacity of the universal joint. The gaskets are made of nylon, possessing excellent wear resistance, self-lubrication, and corrosion resistance, further optimizing the performance of the universal joint.

[0019] 5. The grease filling the oil seal also serves to lubricate the oil seal and prevent wear between the oil seal and the journal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the oil seal of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the oil storage submersible of this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the gasket of this utility model.

[0024] Figure 5 This is a schematic diagram of the oil guide groove of this utility model.

[0025] Diagram markings: 1. Cross shaft body, 11. Journal, 111. Oil reservoir countersunk hole, 2. Bushing, 3. Needle roller, 4. Gasket, 41. Through hole, 42. Oil guide groove, 43. Lubrication countersunk hole, 5. Oil seal, 51. Oil seal groove, 52. Sealing skeleton ring, 53. Inner sealing rubber ring, 54. Support ring, 6. Dust cover, 7. Retaining ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Please see Figure 1-5 This utility model provides a self-lubricating universal joint, including a cross shaft body 1 and four journals 11 integrally formed with the cross shaft body 1. A bushing 2 is fitted on the journal 11, and a needle roller 3 is provided between the bushing 2 and the journal 11. A lubrication space is formed between the inner side wall of the bushing 2 and the outer side wall of the journal 11, and the needle roller 3 is located in the lubrication space. An oil reservoir 111 is provided at the front end of the journal 11, and grease is provided in the oil reservoir 111. A gasket 4 is provided between the end of the journal 11 and the bushing 2. A through hole 41 is provided on the gasket 4 opposite to the oil reservoir 111. A plurality of oil guide grooves 42 are provided on the end face of the gasket 4 opposite to the journal 11. The plurality of oil guide grooves 42 are arranged radially and obliquely with the through hole 41 as the center. The oil guide grooves 42 connect the oil reservoir 111 and the lubrication space, so that the grease in the oil reservoir 111 can flow smoothly into the lubrication space.

[0028] Combination Figure 5 As shown, the end face of the gasket 4 opposite to the journal 11 is also provided with a plurality of lubrication countersunk holes 43. In addition, under the action of centrifugal force, some of the grease will enter the lubrication countersunk holes 43, thereby further playing a lubrication role.

[0029] Combination Figure 1-2 As shown, this application also includes a dust cover 6 and an oil seal 5. The dust cover 6 is located between the opening of the bushing 2 and the journal 11. The oil seal 5 is located between the dust cover 6 and the needle roller 3. A retaining ring 7 is provided between the oil seal 5 and the needle roller 3.

[0030] Specifically, the gasket 4 is located between the corresponding end faces of the journal 11 and the needle rollers 3 and the bushing 2. The needle rollers 3 are arranged in two groups in a ring-shaped distribution, with 30 needle rollers in each group. The gasket 4 is made of nylon material. It should be noted that the parts not described in detail in this application are all prior art. The needle rollers 3 are arranged in two groups in a ring-shaped distribution, with 12 needle rollers in each group. This layout can evenly distribute the load, improve the load-bearing capacity of the universal joint, and reduce the friction between the journal and the bushing.

[0031] Furthermore, the oil seal 5 has an oil seal groove 51 filled with grease. The oil seal 5 includes a sealing skeleton ring 52. An outer sealing rubber ring, nested and bonded to the sealing skeleton ring 52, is provided between the sealing skeleton ring 52 and the bushing 2. An inner sealing rubber ring 53, inserted into the lower end of the sealing skeleton ring 52, is provided between the sealing skeleton ring 52 and the journal 11. A support ring 54, engaging and fixed to the inner sealing rubber ring 53, is provided between the outer side of the inner sealing rubber ring 53 and the sealing skeleton ring 52. An oil seal groove 51 is formed between the inner sealing rubber ring 53 and the outer sealing rubber ring. The outer sealing rubber ring and the inner sealing rubber ring 53 are integrally formed. This structural design gives the oil seal excellent sealing performance, effectively preventing grease leakage and the intrusion of external impurities. A retaining ring 7 is provided between the oil seal 5 and the needle roller 3, serving to position and protect the oil seal.

[0032] The design of the oil reservoir 111, oil guide groove 42, and lubrication countersunk hole 43 achieves the self-lubricating function of the universal joint, ensuring that there is always sufficient grease between the needle roller 3, journal 11, and bushing 2, effectively reducing friction and wear, and extending the service life of the universal joint. The self-lubricating structure reduces the need for frequent lubricant addition to the universal joint, lowers equipment maintenance costs and downtime, and improves production efficiency.

[0033] Of course, this utility model is not limited to the embodiments described above. Several other embodiments based on the design concept of this utility model are also provided below.

[0034] For example, in other embodiments, unlike the embodiments described above, such as... Figure 5As shown, the end face of the gasket 4 relative to the journal 11 is provided with a groove that communicates with the lubrication space, and the lubrication countersunk hole 43 and the oil guide groove 42 are both located in the groove.

[0035] The lubrication process of this application is as follows: During the assembly of the universal joint, an appropriate amount of grease is filled into the oil reservoir 111 at the front end of the journal 11 and the oil seal groove 51 of the oil seal 5. When the universal joint starts to operate, relative movement occurs between the journal 11 and the bushing 2. Under the action of centrifugal force and relative movement between components, the grease in the oil reservoir 111 enters the oil guide groove 42 through the through hole 41 on the gasket 4, and then flows into the lubrication space along the oil guide groove 42, providing lubrication for the journal 11, bushing 2, and needle roller 3. The lubrication reservoir 43 can store a certain amount of grease, which plays a supplementary lubrication role when the grease in the lubrication space is insufficient.

[0036] The dust cover 6 blocks larger dust and impurities from the outside, preventing them from directly entering the lubrication space. The oil seal 5 further seals the area; the outer and inner sealing rubber rings 53 fit tightly against the bushing 2 and journal 11. The support ring 54 enhances the strength and stability of the inner sealing rubber ring 53, preventing grease leakage. The grease filled in the oil seal groove 51 also plays a supporting sealing role, ensuring a stable lubrication environment inside the universal joint.

[0037] Additionally, lubricating grease can be applied to the needle rollers 3 during universal joint assembly to further enhance the lubrication effect.

[0038] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A self-lubricating universal joint, comprising a cross shaft body (1) and four journals (11) integrally formed with the cross shaft body (1), wherein bushings (2) are fitted onto the journals (11), and needle rollers (3) are provided between the bushings (2) and the journals (11), characterized in that, A lubrication space is formed between the inner wall of the bushing (2) and the outer wall of the journal (11), and the needle roller (3) is located in the lubrication space; The journal (11) has an oil reservoir (111) at the front end, and grease is provided in the oil reservoir (111). A gasket (4) is provided between the end of the journal (11) and the bushing (2). A through hole (41) is provided on the gasket (4) relative to the oil reservoir (111). Multiple oil guide grooves (42) are provided on the end face of the gasket (4) relative to the journal (11). The multiple oil guide grooves (42) are arranged radially and inclined with the through hole (41) as the center. The oil guide grooves (42) connect the oil reservoir (111) and the lubrication space.

2. The self-lubricating universal joint according to claim 1, characterized in that, The gasket (4) is also provided with a plurality of lubrication countersunk holes (43) on the end face of the journal (11).

3. The self-lubricating universal joint according to claim 1, characterized in that, It also includes a dust cover (6) and an oil seal (5). The dust cover (6) is located between the opening of the bushing (2) and the journal (11). The oil seal (5) is located between the dust cover (6) and the needle roller (3). A retaining ring (7) is provided between the oil seal (5) and the needle roller (3).

4. A self-lubricating universal joint according to claim 3, characterized in that, The oil seal (5) has an oil seal groove (51) filled with grease.

5. A self-lubricating universal joint according to claim 4, characterized in that, The gasket (4) is located between the corresponding end faces of the journal (11) and the needle roller (3) and the bushing (2).

6. A self-lubricating universal joint according to claim 1, characterized in that, The needle rollers (3) are arranged in two groups in a ring shape, with 30 needle rollers in each group.

7. A self-lubricating universal joint according to claim 1, characterized in that, The oil seal (5) includes a sealing skeleton ring (52). An outer sealing rubber ring is provided between the sealing skeleton ring (52) and the bushing (2) and is nested and bonded to the sealing skeleton ring (52). An inner sealing rubber ring (53) is provided between the sealing skeleton ring (52) and the journal (11) and is inserted into the lower end of the sealing skeleton ring (52). A support ring (54) is provided between the outer side of the inner sealing rubber ring (53) and the sealing skeleton ring (52) and is snapped and fixed to the inner sealing rubber ring (53).

8. A self-lubricating universal joint according to claim 7, characterized in that, The outer sealing rubber ring and the inner sealing rubber ring (53) are made as a single piece.

9. A self-lubricating universal joint according to claim 1, characterized in that, The gasket (4) is made of nylon material.

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