Universal joint precision bearing

Abstract

A universal joint precision bearing, comprising a journal (01), a shaft sleeve (02), an oil seal (03), a needle roller (04) and a dust cover (05), wherein, in a direction parallel to the axis of the journal (01), the dust cover (05) is sleeved on a first end (11) of the journal (01) and is in an interference fit with the journal (01); the shaft sleeve (02) is sleeved on a second end (12) of the journal (01), and the needle roller (04) is located between an outer side face of the journal (01) and an inner wall face of the shaft sleeve (02), the journal (01), the needle roller (04) and the oil seal (03) jointly enclosing a first sealed cavity (61); and the oil seal (03) is located between the shaft sleeve (02) and the dust cover (05), the oil seal (03) and the dust cover (05) being in an interference fit and jointly enclosing a second sealed cavity (62). The problem of a shorter service life in universal joint bearings due to harsh working conditions for the universal joint bearings when working in an environment with mud is solved.

Description

A universal joint precision bearing Technical Field

[0001] The present invention relates to the technical field of bearing sealing, and in particular to a universal joint precision bearing. Background Art

[0002] Universal joint bearings are often used in the lower part of vehicle chassis. They often encounter complex road conditions, including mud, water, and dust. This is especially true for pickup trucks and off-road vehicles, which frequently operate in muddy environments and face harsh operating conditions. If these elements intrude into the universal joint bearings, they can directly corrode the oil seals, causing wear. They can also penetrate the bearings, wearing them out and potentially causing failure. This shortens the lifespan of the universal joint bearings, leading to time and effort losses, increased maintenance and repair costs, production delays, and even potentially impacting driving safety. Therefore, some manufacturers have incorporated dust covers into their universal joint bearings to prevent the intrusion of mud, water, and dust.

[0003] In the prior art, the remaining length of the shaft neck of some universal joint bearings after being connected to the shaft sleeve is short, making it difficult to install a dust cover of a known structure, resulting in the universal joint bearing being unable to block mud, sand, and muddy water during use; the remaining length of the shaft neck of some universal joint bearings after being connected to the shaft sleeve can be used to install a dust cover of a known structure, but the dust cover of the known structure has a poor effect in blocking mud and water. Once mud and water enter the interior of the universal joint bearing, it will increase the difficulty of maintaining the universal joint bearing during use and significantly shorten the service life of the universal joint bearing. Summary of the Invention

[0004] In order to solve the problem that the universal joint bearing has a short life due to the harsh working conditions when working in an environment with mud, the present invention provides a universal joint precision bearing, comprising:

[0005] Universal joint precision bearings include journals, sleeves, oil seals, needle rollers and dust covers;

[0006] Wherein, the dust cover is sleeved on the first end of the journal in a direction parallel to the axis of the journal and has an interference fit with the journal;

[0007] The shaft sleeve is sleeved on the second end of the journal, the needle roller is located between the outer side surface of the journal and the inner wall surface of the shaft sleeve, and the journal, the needle roller and the oil seal together enclose a first sealing cavity;

[0008] The oil seal is located between the shaft sleeve and the dust cover; the oil seal and the dust cover are interference fit and together enclose a second sealing cavity.

[0009] In some embodiments, the oil seal includes a first skeleton and a sealing portion connected to each other; wherein the first skeleton includes a first sealing connection portion, a second sealing connection portion, and a third sealing connection portion connected in sequence;

[0010] In the plane where the axis of the journal is located, the cross-sections of the first sealing connection portion, the second sealing connection portion and the third sealing connection portion are Z-shaped as a whole;

[0011] The first sealing connection part is located between the dust cover and the shaft sleeve, the second sealing connection part is located between the sealing part and the shaft sleeve, and the third sealing connection part is located between the needle roller and the sealing part;

[0012] The sealing portion, the shaft neck and the needle roller together form a first sealing cavity;

[0013] The sealing portion and the dust cover are interference fit and together enclose a second sealed cavity.

[0014] In some embodiments, the dust cover includes a first dustproof connecting portion, a second dustproof connecting portion, and a third dustproof connecting portion connected in sequence;

[0015] Wherein, in the plane where the axis of the journal is located, the cross-sections of the first dustproof connecting portion, the second dustproof connecting portion and the third dustproof connecting portion are generally U-shaped;

[0016] The first sealing connection portion is provided between the first dustproof connection portion and the shaft sleeve;

[0017] The sealing portion and the second dustproof connecting portion are interference fit and together enclose a second sealed cavity.

[0018] In some embodiments, the sealing portion includes a first lip and a second lip;

[0019] The first lip and the second lip are interference-fitted with the second dustproof connection portion, and together enclose a second sealed cavity;

[0020] The first lip, the first dustproof connection portion and the first sealing connection portion together enclose a third sealing cavity.

[0021] In some embodiments, in the plane where the axis of the journal is located, the cross-sections of the first lip and the second lip are generally in a herringbone shape.

[0022] In some embodiments, the sealing portion further includes a third lip and a fourth lip;

[0023] Among them, the third lip is interference fit with the shaft neck or the third dustproof connection part, and the fourth lip is interference fit with the shaft neck or the third dustproof connection part, so that the third lip, the fourth lip and the shaft neck and / or the third dustproof connection part together enclose a fourth sealing cavity.

[0024] In some embodiments, in the plane where the axis of the journal is located, the cross-sections of the third lip and the fourth lip are generally in a herringbone shape.

[0025] In some embodiments, the dust cover further comprises a fifth lip made of an elastic material, and the first dustproof connection portion, the second dustproof connection portion and the first sealing connection portion are all made of a rigid material;

[0026] The fifth lip is fixedly connected to the second dustproof connection portion, and the fifth lip is interference fit with the first sealing connection portion.

[0027] In some embodiments, a minimum distance between the first dust-proof connection portion and the first sealing connection portion along a direction parallel to the axis of the journal is 0-0.1 mm.

[0028] In some embodiments, the sealing portion includes a second lip and a third lip;

[0029] Among them, the second lip is interference fit with the dust cover, the third lip is interference fit with the shaft neck, and the second lip, the third lip, the dust cover and the shaft neck together enclose a fifth sealing cavity.

[0030] In some embodiments, a limiting portion is provided on the first end of the journal, and the limiting portion is used to limit the dust cover from moving in a direction parallel to the axis of the journal.

[0031] In some embodiments, the limiting portion is a limiting curved surface, and part of the outer surface of the dust cover is in contact with the limiting curved surface.

[0032] In some embodiments, the dust cover and the first frame are both made of rigid materials, and a fifth lip made of elastic material is fixedly connected to the dust cover; the fifth lip is arranged between the dust cover and the first sealing connection part, and the fifth lip is interference fit with the first sealing connection part.

[0033] In order to solve the problem that the universal joint bearing has a short life due to the harsh working conditions when working in an environment with mud, the present invention has the following advantages:

[0034] The universal joint precision bearing includes a journal, a sleeve, an oil seal, a needle roller, and a dust cover. The dust cover is sleeved on the first end of the journal in a direction parallel to the axis of the journal and has an interference fit with the journal. The sleeve is sleeved on the second end of the journal, and the needle roller is located between the outer side surface of the journal and the inner wall surface of the sleeve. The journal, needle roller, and oil seal together form a first sealed cavity. The oil seal is located between the sleeve and the dust cover. The oil seal and the dust cover have an interference fit and together form a second sealed cavity. The cooperation between the journal, needle roller, oil seal, and dust cover forms two sealed cavities enclosed by different structures. Compared with the prior art, the universal joint precision bearing provided by the embodiment of the present application has a better sealing effect, can effectively prevent mud and water from contacting the needle roller in a muddy environment, improve the adaptability of the universal joint bearing to harsh working conditions, and extend the product life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 shows a partial cross-sectional view of a universal joint precision bearing provided in this embodiment;

[0036] FIG2 shows a partial enlarged view of a first optional embodiment of a universal joint precision bearing provided in an embodiment of the present application;

[0037] FIG3 shows a partial enlarged view of a second optional embodiment of a universal joint precision bearing provided in an embodiment of the present application;

[0038] FIG4 shows a partial enlarged view of a third optional embodiment of a universal joint precision bearing provided in an embodiment of the present application;

[0039] FIG5 shows a partial enlarged view of a fourth optional embodiment of a universal joint precision bearing provided in an embodiment of the present application;

[0040] FIG6 shows a partial enlarged view of a fifth optional embodiment of the universal joint precision bearing provided in an embodiment of the present application;

[0041] FIG7 shows a partially enlarged view of a sixth optional implementation of the universal joint precision bearing provided in an embodiment of the present application.

[0042] Figure markings: 01-shaft journal; 11-first end; 12-second end; 02-sleeve; 03-oil seal; 31-first skeleton; 311-first sealing connection; 312-second sealing connection; 313-third sealing connection; 32-sealing part; 321-first lip; 322-second lip; 323-third lip; 324-fourth lip; 04-needle roller; 05-dust cover; 51-first dustproof connection; 52-second dustproof connection; 53-third dustproof connection; 54-fifth lip; 61-first sealing cavity; 62-second sealing cavity; 63-third sealing cavity; 64-fourth sealing cavity; 65-fifth sealing cavity; X-direction parallel to the axis of the shaft journal. DETAILED DESCRIPTION

[0043] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0044] As used herein, the term "including" and variations thereof are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as meaning "at least one embodiment." The term "another embodiment" is to be interpreted as meaning "at least one other embodiment."

[0045] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0046] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0047] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "first," "second," and the like are primarily used to distinguish different devices, elements, or components (which may or may not be the same in type and configuration) and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0049] This embodiment discloses a universal joint precision bearing, as shown in Figures 1 to 7 , which includes a journal 01 , a sleeve 02 , an oil seal 03 , a needle roller 04 and a dust cover 05 .

[0050] The dust cover 05 is sleeved on the first end 11 of the journal 01 along a direction X parallel to the axis of the journal 01 and is interference fit with the journal 01 .

[0051] The shaft sleeve 02 is sleeved on the second end 12 of the journal 01 , and the needle roller 04 is located between the outer side surface of the journal 01 and the inner wall surface of the shaft sleeve 02 . The journal 01 , the needle roller 04 and the oil seal 03 together form a first sealing cavity 61 .

[0052] The oil seal 03 is located between the shaft sleeve 02 and the dust cover 05. The oil seal 03 and the dust cover 05 are interference fit and together enclose a second sealing cavity 62.

[0053] In this embodiment, along the axis of the journal 01, the journal 01 has a first end 11 and a second end 12, wherein a dust cover 05 with an interference fit with the first end 11 is installed around the first end 11 of the journal 01, and a needle roller 04 is rolled between the second end 12 of the journal 01 and the sleeve 02.

[0054] In this embodiment, oil seal 03 forms an interference fit with shaft sleeve 02 and dust cover 05, achieving a sealed connection between shaft sleeve 02 and dust cover 05. The specific structure of oil seal 03 is not limited and can be appropriately configured based on actual application requirements. For example, oil seal 03 can be an integrally formed structure or an assembled structure composed of two or more parts.

[0055] In this embodiment, the needle roller 04 is installed between the sleeve 02 and the journal 01, and can rotate relative to the sleeve 02 and the journal 01 respectively, so that when the sleeve 02 moves relative to the journal 01, the presence of the needle roller 04 can reduce the friction generated by the overall structure of the universal joint precision bearing during the movement.

[0056] In this embodiment, the dust cover 05 forms an interference fit with the journal 01 and the oil seal 03, preventing external contaminants such as mud, water, and dust from entering the second sealed cavity 62. The cross-sectional shape of the dust cover 05 along the axis of the journal 01 is not limited, and can be, for example, L-shaped, U-shaped, or Z-shaped. Furthermore, the material of the dust cover 05 is not limited, and can be rigid, elastic, plastic, or a combination thereof.

[0057] In this embodiment, the first sealed cavity 61 is enclosed by the journal 01, needle roller 04, and oil seal 03, while the second sealed cavity 62 is enclosed by the oil seal 03 and dust cover 05. The arrangement of the first and second sealed cavities 61 and 62 creates at least two seals, preventing external contaminants such as mud, sand, muddy water, and dust from contacting the needle roller 04, the outer surface of the second end 12 of the journal 01, and the inner wall of the sleeve 02. It also prevents the lubricant typically present in the second sealed cavity 62 from escaping.

[0058] In this embodiment, the dust cover 05 and the shaft journal 01 have an interference fit and form a fixed connection, and the shaft sleeve 02 and the dust cover 05 also have an interference fit and form a fixed connection. The needle roller 04 is installed between the shaft journal 01 and the shaft sleeve 02. When the shaft sleeve 02 rotates relative to the shaft journal 01, the shaft sleeve 02 can drive the needle roller 04 to rotate relative to the shaft sleeve 02, as well as relative to the shaft journal 01 and the dust cover 05. The shaft sleeve 02 can also drive the oil seal 03 to rotate relative to the shaft journal 01 and the dust cover 05.

[0059] In some embodiments, referring to Figures 1 to 7, the oil seal 03 includes a first skeleton 31 and a sealing portion 32 connected to each other. The first skeleton 31 includes a first sealing connection portion 311, a second sealing connection portion 312, and a third sealing connection portion 313 connected in sequence.

[0060] In the plane where the axis of the journal 01 is located, the cross-sections of the first sealing connection portion 311 , the second sealing connection portion 312 and the third sealing connection portion 313 are Z-shaped as a whole.

[0061] The first sealing connection portion 311 is located between the dust cover 05 and the shaft sleeve 02 , the second sealing connection portion 312 is located between the sealing portion 32 and the shaft sleeve 02 , and the third sealing connection portion 313 is located between the needle roller 04 and the sealing portion 32 .

[0062] The sealing portion 32 , the journal 01 and the needle roller 04 together form a first sealing cavity 61 .

[0063] The sealing portion 32 and the dust cover 05 are interference fit and together enclose a second sealed cavity 62 .

[0064] In this embodiment, the first skeleton 31 is fixedly connected to the sealing portion 32, wherein the first skeleton 31 is used to improve the overall structural strength of the oil seal 03. The material of the first skeleton 31 is not limited, and can be a rigid material, a plastic material, an elastic material, etc.

[0065] In this embodiment, the first sealing connection portion 311 is located between the dust cover 05 and the shaft sleeve 02, the second sealing connection portion 312 is located between the sealing portion 32 and the shaft sleeve 02, and the third sealing connection portion 313 is located between the needle roller 04 and the sealing portion 32. The first sealing connection portion 311, the second sealing connection portion 312, and the third sealing connection portion 313 form a first framework 31 with a Z-shaped cross section. The provision of the first framework 31 with a Z-shaped cross section can increase the rigidity of the oil seal 03 and reduce the difficulty of assembly.

[0066] In this embodiment, the sealing portion 32 is configured to form an interference fit with the dust cover 05 and, together with the journal 01 and the needle roller 04, enclose a first sealed cavity 61. Furthermore, the sealing portion 32 is configured to form an interference fit with the dust cover 05 and, together, enclose a second sealed cavity 62. The cross-sectional shape of the sealing portion 32, as viewed along the plane of the axis of the journal 01, is not limited and may, for example, be a quadrilateral, semicircle, triangle, or tree-branch shape.

[0067] In some embodiments, as shown in FIG. 4 , FIG. 5 and FIG. 7 , the dustproof cover 05 includes a first dustproof connection portion 51 , a second dustproof connection portion 52 and a third dustproof connection portion 53 that are sequentially connected.

[0068] In the plane where the axis of the journal 01 is located, the cross-sections of the first dustproof connection portion 51 , the second dustproof connection portion 52 and the third dustproof connection portion 53 are generally U-shaped.

[0069] The first sealing connection portion 311 is provided between the first dustproof connection portion 51 and the shaft sleeve 02 .

[0070] The sealing portion 32 and the second dustproof connecting portion 52 are interference fit and together enclose a second sealed cavity 62 .

[0071] In this embodiment, since the universal joint bearing is in the working state, the needle roller 04 may move along the axis of the shaft neck 01 during the rotation process as the sleeve 02 rotates, and apply a thrust along the axial direction of the shaft neck 01 to the oil seal 03. By designing the cross section of the dust cover 05 into a U shape, when the needle roller 04 applies a thrust along the axial direction of the shaft neck 01 to the oil seal 03, the third dustproof connection part 53 of the dust cover 05 is interference fit with the shaft neck 01, and the first dustproof connection part 51 of the dust cover 05 can abut the first sealing connection part 311 of the oil seal 03 to prevent the oil seal 03 from moving as a whole along the axis of the shaft neck 01 toward the opening of the sleeve 02, thereby preventing the oil seal 03 from detaching from the inside of the sleeve 02.

[0072] In some embodiments, the sealing portion 32 includes a first lip 321 and a second lip 322 .

[0073] The first lip 321 and the second lip 322 are interference-fitted with the second dustproof connection portion 52 , and together enclose a second sealed cavity 62 .

[0074] The first lip 321 , the first dustproof connection portion 51 and the first sealing connection portion 311 together enclose a third sealing cavity 63 .

[0075] In this embodiment, the first lip 321 and the second lip 322 are annular structures on one side of the sealing portion 32 . The first lip 321 and the second lip 322 are both used to interference fit with the second dustproof connecting portion 52 of the dust cover 05 to form a second sealed cavity 62 .

[0076] In this embodiment, the cross-section of the first lip 321 and the cross-section of the second lip 322 in the plane of the axis of the journal 01 are not limited to any shape. For example, the cross-sections of the two can be combined to form a herringbone shape, a U shape, or a Z shape.

[0077] In this embodiment, the third sealing cavity 63 is formed by the first dustproof connection portion 51, the first sealing connection portion 311, and the first lip 321. Because the first dustproof connection portion 51 and the second dustproof connection portion 52 are arranged at different angles, a sealed connection between the oil seal 03 and the dust cover 05 can be achieved from different angles. Furthermore, the formation of the third sealing cavity 63 adds an additional layer of sealing, further enhancing the overall sealing effect.

[0078] In some embodiments, in the plane where the axis of the journal 01 is located, the cross-sections of the first lip 321 and the second lip 322 are generally in a herringbone shape.

[0079] In this embodiment, the cross-sections of the first lip 321 and the second lip 322 are arranged in a herringbone shape so that the oil seal 03 can seal the space between the journal 01 and the sleeve 02 in two directions, thereby improving the sealing effect.

[0080] In some embodiments, the sealing portion 32 further includes a third lip 323 and a fourth lip 324 .

[0081] Among them, the third lip 323 has an interference fit with the shaft neck 01 or the third dustproof connection part 53, and the fourth lip 324 has an interference fit with the shaft neck 01 or the third dustproof connection part 53, so that the third lip 323, the fourth lip 324 and the shaft neck 01 and / or the third dustproof connection part 53 together enclose a fourth sealing cavity 64.

[0082] In this embodiment, the third lip 323 and the fourth lip 324 are annular structures arranged on one side of the sealing portion 32. The third lip 323 and the fourth lip 324 are both used to interference fit with the dust cover 05, thereby sealing the space between the shaft neck 01 and the sleeve 02.

[0083] In this embodiment, the fourth sealing cavity 64 is formed by the third lip 323 , the fourth lip 324 , the shaft journal 01 and / or the third dustproof connection portion 53 .

[0084] In this embodiment, in the plane where the axis of the journal 01 is located, the shapes of the cross sections of the third lip 323 and the fourth lip 324 are not limited. For example, the cross sections of the two can be combined to form a herringbone, U-shape, or Z-shape.

[0085] In this embodiment, the third lip 323 and the fourth lip 324 are provided to increase the number of sealing cavities formed by the sealing portion 32 and the shaft neck 01, the dust cover 05, the sleeve 02 and the needle roller 04, thereby improving the sealing effect.

[0086] In some embodiments, in the plane where the axis of the journal 01 is located, the cross-sections of the third lip 323 and the fourth lip 324 are generally in a herringbone shape.

[0087] The cross-sections of the third lip 323 and the fourth lip 324 are arranged in a herringbone shape so that the oil seal 03 can seal the space between the journal 01 and the sleeve 02 in two directions, thereby improving the sealing effect.

[0088] In some embodiments, the dust cover 05 further includes a fifth lip 54 made of elastic material, and the first dustproof connection portion 51 , the second dustproof connection portion 52 and the first sealing connection portion 311 are all made of rigid material.

[0089] The fifth lip 54 is fixedly connected to the second dustproof connection portion 52 , and the fifth lip 54 is interference fit with the first sealing connection portion 311 .

[0090] In this embodiment, the first dustproof connection portion 51 , the second dustproof connection portion 52 and the first sealing connection portion 311 are all made of rigid materials.

[0091] In this embodiment, the fifth lip 54 made of elastic material is located on the second dustproof connection part 52, and the fifth lip 54 is interference fit with the first sealing connection part 311. The fifth lip 54 is used to seal the space between the second dustproof connection part 52 made of rigid material and the first sealing connection part 311.

[0092] In this embodiment, if the dust cover 05 were made entirely of rigid material, a certain distance would need to be left between the rigid dust cover 05 and the rigid first frame 31, thereby reducing the dustproof effect. Therefore, providing a fifth lip 54 made of elastic material on the second dustproof connection portion 52 can seal the second dustproof connection portion 52 with the first sealing connection portion 311 through elastic deformation, thereby improving the dustproof effect.

[0093] In some embodiments, along a direction X parallel to the axis of the journal 01 , a minimum distance between the first dustproof connection portion 51 and the first sealing connection portion 311 is 0-0.1 mm.

[0094] In this embodiment, since the distance between the first dustproof connection portion 51 and the first sealing connection portion 311 is limited to 0-0.1 mm, the smaller gap can play a dustproof role and can limit the axial movement of the sealing portion 32.

[0095] In some embodiments, the sealing portion 32 includes a second lip 322 and a third lip 323 .

[0096] The second lip 322 is interference fit with the dust cover 05 , and the third lip 323 is interference fit with the shaft neck 01 . The second lip 322 , the third lip 323 , the dust cover 05 and the shaft neck 01 together enclose a fifth sealing cavity 65 .

[0097] In this embodiment, the second lip 322 , the third lip 323 , the dust cover 05 and the shaft neck 01 together enclose a fifth sealing cavity 65 . A plurality of different sealing cavities are provided according to different structures, thereby further improving the sealing effect.

[0098] In some embodiments, a limiting portion (not shown in the figures) is provided on the first end 11 of the journal 01 , and the limiting portion is used to limit the movement of the dust cover 05 along a direction X parallel to the axis of the journal 01 .

[0099] In this embodiment, the stopper is a portion on the first end 11 of the journal 01. The stopper can be configured in any manner, including a surface structure, a raised structure, an assembled structure, etc. The stopper is used to limit the movement of the dust cover 05, thereby limiting the movement of the oil seal 03 through the dust cover 05, further enhancing the effectiveness of preventing the oil seal 03 from falling off.

[0100] In some embodiments, the limiting portion is a limiting curved surface, and part of the outer surface of the dust cover 05 is in contact with the limiting curved surface.

[0101] In this embodiment, since the curved surface structure has the characteristics of being easy to process with simple precision and high structural strength, the structure of the limiting portion is preferably a curved surface structure.

[0102] In some embodiments, the dust cover 05 and the first frame 31 are both made of rigid material, and a fifth lip 54 made of elastic material is fixedly connected to the dust cover 05. The fifth lip 54 is disposed between the dust cover 05 and the first sealing connection portion 311, and the fifth lip 54 and the first sealing connection portion 311 have an interference fit.

[0103] In this embodiment, the fifth lip 54 made of elastic material is provided between the dust cover 05 and the first sealing connection portion 311 , and is used to seal the gap between the dust cover 05 and the first frame 31 .

[0104] In this embodiment, when both the dust cover 05 and the first frame 31 are made of rigid materials, a certain gap must be left between the dust cover 05 and the first frame 31. Otherwise, the contact surface between the dust cover 05 and the first frame 31 may suffer wear and tear due to contact, shortening the lifespan. Therefore, a fifth lip 54 made of elastic material is provided on the rigid dust cover 05 to seal the gap between the dust cover 05 and the first frame 31, further improving the sealing effect and preventing severe wear.

[0105] As can be seen from the description of the above embodiments of the present application, the universal joint precision bearing includes a journal 01, a sleeve 02, an oil seal 03, a needle roller 04, and a dust cover 05. The dust cover 05 is sleeved on the first end 11 of the journal 01 along a direction X parallel to the axis of the journal 01 and has an interference fit with the journal 01. The sleeve 02 is sleeved on the second end 12 of the journal 01. The needle roller 04 is located between the outer side surface of the journal 01 and the inner wall surface of the sleeve 02. The journal 01, the needle roller 04, and the oil seal 03 together enclose a first sealed cavity 61. The oil seal 03 is located between the sleeve 02 and the dust cover 05. The oil seal 03 and the dust cover 05 have an interference fit and together enclose a second sealed cavity 62. Through the cooperation between the journal 01, the needle roller 04, the oil seal 03 and the dust cover 05, a sealed cavity enclosed by two different structures is formed. Compared with the existing technology, the embodiment of the present application provides a universal joint precision bearing with better sealing effect, which can effectively prevent mud and muddy water from contacting the needle roller 04 in a muddy environment, thereby improving the adaptability of the universal joint bearing to harsh working conditions and extending the product life.

[0106] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A universal joint precision bearing, characterized in that: The universal joint precision bearing comprises a journal, a sleeve, an oil seal, a needle roller and a dust cover; Wherein, the dust cover is sleeved on the first end of the shaft journal along a direction parallel to the axis of the shaft journal and has an interference fit with the shaft journal; The shaft sleeve is sleeved on the second end of the journal, the needle roller is located between the outer side surface of the journal and the inner wall surface of the shaft sleeve, and the journal, the needle roller and the oil seal together enclose a first sealing cavity; The oil seal is located between the shaft sleeve and the dust cover; the oil seal and the dust cover are interference fit and together enclose a second sealing cavity.

2. The universal joint precision bearing according to claim 1, characterized in that: The oil seal comprises a first skeleton and a sealing portion connected to each other; wherein the first skeleton comprises a first sealing connection portion, a second sealing connection portion and a third sealing connection portion connected in sequence; In the plane where the axis of the journal is located, the cross-sections of the first sealing connection part, the second sealing connection part and the third sealing connection part are in a Z shape as a whole; The first sealing connection portion is located between the dust cover and the shaft sleeve, the second sealing connection portion is located between the sealing portion and the shaft sleeve, and the third sealing connection portion is located between the needle roller and the sealing portion; The sealing portion, the shaft neck and the needle roller together enclose the first sealing cavity; The sealing portion and the dust cover are interference fit, and together they enclose to form the second sealing cavity.

3. The universal joint precision bearing according to claim 2, characterized in that: The dustproof cover comprises a first dustproof connecting portion, a second dustproof connecting portion and a third dustproof connecting portion which are connected in sequence; Wherein, in the plane where the axis of the journal is located, the cross-sections of the first dustproof connection part, the second dustproof connection part and the third dustproof connection part are in a U shape as a whole; The first sealing connection portion is arranged between the first dustproof connection portion and the shaft sleeve; The sealing portion and the second dustproof connecting portion are interference fit, and together enclose to form the second sealed cavity.

4. The universal joint precision bearing according to claim 3, characterized in that: The sealing portion includes a first lip and a second lip; Wherein, the first lip and the second lip are interference fit with the second dustproof connection part, and together enclose to form the second sealing cavity; The first lip, the first dustproof connection portion and the first sealing connection portion together enclose a third sealing cavity.

5. The universal joint precision bearing according to claim 4, characterized in that: The sealing portion further includes a third lip and a fourth lip; Among them, the third lip has an interference fit with the shaft neck or the third dust-proof connection part, and the fourth lip has an interference fit with the shaft neck or the third dust-proof connection part, so that the third lip, the fourth lip and the shaft neck and / or the third dust-proof connection part together enclose a fourth sealing cavity.

6. The universal joint precision bearing according to claim 3, characterized in that: The dust cover further comprises a fifth lip made of elastic material, and the first dustproof connection portion, the second dustproof connection portion and the first sealing connection portion are all made of rigid material; The fifth lip is fixedly connected to the second dustproof connection portion, and the fifth lip is interference fit with the first sealing connection portion.

7. The universal joint precision bearing according to claim 3, characterized in that: Along a direction parallel to the axis of the journal, a minimum distance between the first dustproof connection portion and the first sealing connection portion is 0-0.1 mm.

8. The universal joint precision bearing according to claim 3, characterized in that: A limiting portion is provided on the first end of the journal, and the limiting portion is used to limit the movement of the dust cover in a direction parallel to the axis of the journal.

9. The universal joint precision bearing according to claim 2, characterized in that: The sealing portion includes a second lip and a third lip; The second lip is interference fit with the dust cover, the third lip is interference fit with the shaft neck, and the second lip, the third lip, the dust cover and the shaft neck together enclose a fifth sealing cavity.

10. The universal joint precision bearing according to claim 2, characterized in that: The dust cover and the first frame are both made of rigid materials, and a fifth lip made of elastic material is fixedly connected to the dust cover; the fifth lip is arranged between the dust cover and the first sealing connection part, and the fifth lip is interference fit with the first sealing connection part.

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