Five-lip rubber oil seal and sealing structure

Abstract

The utility model discloses a five-lip rubber oil seal and a sealing structure, and relates to the technical field of automobile parts, the five-lip rubber oil seal comprises an oil seal framework, a first rubber body and a second rubber body; the oil seal framework comprises a horizontal section, and the outer side end of the horizontal section is bent downwards to form a vertical section. The first rubber body wraps the inner side end of the horizontal section, the lower end of the first rubber body extends downwards to form an extending part, and a main lip is arranged on the inner side of the extending part; an outer auxiliary lip and an inner auxiliary lip are sequentially arranged at the upper end of the inner side of the first rubber body from top to bottom. The second rubber body covers the middle of the top face of the horizontal section, and a radial side lip and an axial side lip are sequentially arranged on the second rubber body from inside to outside. The dustproof capability of the oil seal is enhanced, so that the sealing performance of the oil seal is improved, and the service life of the oil seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a five-lip rubber oil seal and a sealing structure. Background Art

[0002] At present, rubber seals are most widely used in the automotive industry. The seal used for rotating shafts generally adopts a fluid dynamic rubber lip seal ring structure. Its sealing mechanism is that a linear contact zone is formed between the oil seal rubber lip and the rotating shaft, and a very thin and uniform oil film is formed between the shaft and the rubber at this zone, with a thickness of about 2.5um. The oil film can take away the friction heat generated by the relative movement between the lip and the shaft to lubricate it, and can also generate a certain tension on the surface of the oil film to prevent the outflow of lubricating oil and form a seal.

[0003] In actual applications, the oil seals of the left and right half shafts of the front-wheel drive main reducer of SUV models, the oil seals of the active bevel gears, the oil seals of the input and output shafts of the middle bridge of commercial vehicles, and the main cone oil seals of the rear axle often leak lubricating oil due to wear of the main lip. Oil leakage can lead to serious consequences such as bearing burning and environmental pollution. Cause analysis: These oil seals are used on the chassis, close to the ground. During vehicle operation, dust and muddy water are more likely to penetrate. The previous single dustproof port structure has poor anti-muddy water and dustproof effects. After mud and sand enter the sealing surface, the oil seal lip is worn early, reducing the service life of the oil seal.

[0004] Some oil seal manufacturers have also proposed multi-lip box oil seals, but they are too expensive for customers to accept. Therefore, there is an urgent need for a seal that is cost-effective, has good mud and water resistance, dust resistance, strong adaptability, and can work stably for a long time under harsh working conditions. Utility Model Content

[0005] In view of the defects existing in the prior art, the purpose of the utility model is to provide a five-lip rubber oil seal and a sealing structure, which can better prevent external mud and water from entering the sealing surface and causing excessive and abnormal wear of the oil seal lip, and damage to the oil seal and resulting in sealing failure.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a five-lip rubber oil seal, including an oil seal skeleton, and also including a first rubber body and a second rubber body; the oil seal skeleton includes a horizontal section, and the outer end of the horizontal section is bent downward to form a vertical section; the first rubber body wraps the inner end of the horizontal section, and the lower end of the first rubber body extends downward to form an extension portion, and a main lip is arranged on the inner side of the extension portion; the inner upper end of the first rubber body is provided with an outer auxiliary lip and an inner auxiliary lip in sequence from top to bottom; the second rubber body covers the middle part of the top surface of the horizontal section, and the second rubber body is provided with radial side lips and axial side lips in sequence from inside to outside.

[0007] A further improvement is that a spring groove is arranged at a position on the outside of the extension portion opposite to the main lip, and an oil seal spring is arranged in the spring groove.

[0008] A further improvement is that the oil side surface of the inner auxiliary lip is provided with a plurality of convex points.

[0009] A further improvement is that a rubber convex ring is provided on the bottom surface of the horizontal section near the first rubber body.

[0010] A further improvement is that it also includes a third rubber body, the third rubber body wraps the vertical section, and the outer side surface of the third rubber body is provided with a thread groove.

[0011] A further improvement is that a plurality of protrusions are arranged at the lower end of the third rubber body.

[0012] A further improvement is that: the first rubber body and the second rubber body are an integrated structure, and a first groove is provided at the connection between the first rubber body and the second rubber body; the third rubber body and the second rubber body are an integrated structure, and a second groove is provided at the connection between the third rubber body and the second rubber body.

[0013] The utility model also provides a sealing structure, including a mounting seat and a rotating shaft, and a metal dust cover is arranged at the shoulder of the rotating shaft, and a five-lip rubber oil seal as mentioned above is arranged between the mounting seat and the rotating shaft, and the main lip, the outer auxiliary lip, and the inner auxiliary lip are respectively abutted against the rotating shaft; the radial side lip and the axial side lip are respectively abutted against the metal dust cover; the outer side surface of the third rubber body is abutted against the mounting seat.

[0014] A further improvement is that the outer auxiliary lip and the rotating shaft are overfitted, with a fitting amount of 0±0.3mm; the inner auxiliary lip and the rotating shaft are interference fit, with an interference amount of 0.4±0.3mm.

[0015] A further improvement is that the metal dust cover includes a first horizontal portion, the inner end of the first horizontal portion is bent downward to form a first vertical portion, the outer end of the first horizontal portion is bent downward to form a second vertical portion, the lower end of the second vertical portion is bent outward to form a second horizontal portion, and the outer end of the second horizontal portion is tilted upward to form a raised portion; the radial side lip is abutted against the inner side of the second vertical portion, and the axial side lip is abutted against the second horizontal portion.

[0016] The beneficial effects of the utility model are:

[0017] The utility model oil seal prevents the entry of external mud and sand layer by layer through two side lips and two auxiliary lips, thereby ensuring that external dust, impurities and the like cannot enter the sealing surface, making the sealing surface cleaner, thereby effectively prolonging the service life of the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a five-lip rubber oil seal in an embodiment of the utility model;

[0019] Figure 2 It is a partial enlarged schematic diagram of a five-lip rubber oil seal in an embodiment of the utility model;

[0020] Figure 3 It is a cross-sectional view of a five-lip rubber oil seal in an embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of a sealing structure in an embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the metal dust cover in the embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the compression vulcanization forming of the five-lip rubber oil seal in the embodiment of the utility model.

[0024] Reference numerals:

[0025] 1- oil seal skeleton; 11- horizontal section; 12- vertical section;

[0026] 2-first rubber body; 21-main lip; 22-spring groove; 23-outer auxiliary lip; 24-inner auxiliary lip; 25-convex point;

[0027] 3-Oil seal spring;

[0028] 4-second rubber body; 41-radial side lip; 42-axial side lip; 43-first groove; 44-second groove;

[0029] 5-third rubber body; 51-thread groove; 52-bump;

[0030] 6-Rubber convex ring;

[0031] 7-Mounting seat;

[0032] 8- rotating shaft;

[0033] 9-metal dust cover; 91-first horizontal portion; 92-first vertical portion; 93-second vertical portion; 94-second horizontal portion; 95-lifting portion. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below. The embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0035] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0037] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, but cannot be understood as limiting the utility model.

[0038] See also Figure 1 to Figure 3 As shown, the embodiment of the utility model provides a five-lip rubber oil seal, comprising an oil seal skeleton 1, and also comprising a first rubber body 2 and a second rubber body 4;

[0039] The oil seal skeleton 1 comprises a horizontal section 11 , the outer end of which is bent downward to form a vertical section 12 ; specifically, a rubber convex ring 6 is provided on the bottom surface of the horizontal section 11 near the first rubber body 2 .

[0040] The first rubber body 2 wraps the inner end of the horizontal section 11, and the lower end of the first rubber body 2 extends downward to form an extension portion, and a main lip 21 is arranged on the inner side of the extension portion; the inner upper end of the first rubber body 2 is provided with an outer auxiliary lip 23 and an inner auxiliary lip 24 in order from top to bottom; specifically, a spring groove 22 is provided at the position opposite to the main lip 21 on the outer side of the extension portion, and an oil seal spring 3 is provided in the spring groove 22, and the oil seal spring provides a lasting radial force to the main lip. A plurality of convex points 25 are provided on the oil side of the inner auxiliary lip 24. The number of convex points is determined according to the shaft diameter, generally 3-12 equal parts, and the convex points can discharge the gas between the main and auxiliary lips to prevent the formation of a vacuum between the main and auxiliary lips and cause oil leakage.

[0041] The second rubber body 4 covers the middle portion of the top surface of the horizontal section 11 , and a radial side lip 41 and an axial side lip 42 are sequentially arranged on the second rubber body 4 from inside to outside.

[0042] The five-lip rubber oil seal also includes a third rubber body 5, which wraps the vertical section 12, and a threaded groove 51 is provided on the outer side of the third rubber body 5. Specifically, a plurality of protrusions 52 are provided at the lower end of the third rubber body 5. The first rubber body 2 and the second rubber body 4 are an integral structure, and a first groove 43 is provided at the connection between the first rubber body 2 and the second rubber body 4; the third rubber body 5 and the second rubber body 4 are an integral structure, and a second groove 44 is provided at the connection between the third rubber body 5 and the second rubber body 4.

[0043] See also Figure 4 As shown, the embodiment of the utility model also provides a sealing structure, including a mounting seat 7 and a rotating shaft 8, and a metal dust cover 9 is arranged at the shaft shoulder of the rotating shaft 8, and a five-lip rubber oil seal as described above is arranged between the mounting seat 7 and the rotating shaft 8, and the main lip 21, the outer auxiliary lip 23, and the inner auxiliary lip 24 are respectively abutted against the rotating shaft 8; the radial side lip 41 and the axial side lip 42 are respectively abutted against the metal dust cover 9; the outer side surface of the third rubber body 5 is abutted against the mounting seat 7. Specifically, the outer auxiliary lip 23 is overfitted with the rotating shaft 8, and the fitting amount is 0±0.3mm; the inner auxiliary lip 24 is interference fit with the rotating shaft 8, and the interference amount is 0.4±0.3mm. These two auxiliary lips further prevent the entry of external mud and sand.

[0044] See also Figure 5 As shown, the metal dust cover 9 includes a first horizontal portion 91, the inner end of the first horizontal portion 91 is bent downward to form a first vertical portion 92, the outer end of the first horizontal portion 91 is bent downward to form a second vertical portion 93, the lower end of the second vertical portion 93 is bent outward to form a second horizontal portion 94, and the outer end of the second horizontal portion 94 is tilted upward to form a raised portion 95; the radial side lip 41 is abutted against the inner side of the second vertical portion 93, and the axial side lip 42 is abutted against the second horizontal portion 94. Specifically, the axial side lip is interference fit with the metal dust cover, and the interference amount is 0.3-3.0mm, which can block large particles of sand and dust trying to enter the interior on the outside, and the axial side lip is inclined inward, and the mud and sand have a reflux effect after being sprayed, thereby reducing the amount of mud and sand entering the interior; the radial side lip is interference fit with the metal dust cover, and the interference amount is 0.3-1.2mm, which further blocks small particles of mud and sand that are not blocked by the axial side lip.

[0045] See also Figure 6 As shown, the manufacturing process of the five-lip rubber oil seal of the utility model is:

[0046] 1. First, use a rubber mold to vulcanize the rubber body and the oil seal frame into a whole;

[0047] 2. Second stage vulcanization, lip cutting, spring sleeve, and apply 2# lithium-based grease between the main and auxiliary lips.

[0048] The utility model enhances the dustproof capability of the oil seal, thereby improving the sealing performance of the oil seal and extending the service life of the oil seal.

[0049] In the description of the specification, the description with reference to the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model, and the schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Through the description of the above structure and principle, technicians in the relevant technical field should understand that the present invention is not limited to the above-mentioned specific implementation methods. Improvements and substitutions based on the present invention using the known technology in the field all fall within the protection scope of the present invention and should be defined by the claims.

Claims

1. A five-lip rubber oil seal, comprising an oil seal frame (1), characterized in that: It also includes a first rubber body (2) and a second rubber body (4); The oil seal skeleton (1) comprises a horizontal section (11), and the outer end of the horizontal section (11) is bent downward to form a vertical section (12); The first rubber body (2) wraps around the inner end of the horizontal section (11); the lower end of the first rubber body (2) extends downward to form an extension portion, and a main lip (21) is arranged on the inner side of the extension portion; the inner upper end of the first rubber body (2) is provided with an outer auxiliary lip (23) and an inner auxiliary lip (24) in sequence from top to bottom; The second rubber body (4) covers the middle part of the top surface of the horizontal section (11), and the second rubber body (4) is provided with radial side lips (41) and axial side lips (42) in sequence from the inside to the outside.

2. The five-lip rubber oil seal according to claim 1, characterized in that: A spring groove (22) is arranged at a position on the outside of the extension portion opposite to the main lip (21), and an oil seal spring (3) is arranged in the spring groove (22).

3. The five-lip rubber oil seal according to claim 1, characterized in that: The oil side surface of the inner auxiliary lip (24) is provided with a plurality of convex points (25).

4. The five-lip rubber oil seal according to claim 1, characterized in that: A rubber convex ring (6) is provided on the bottom surface of the horizontal section (11) near the first rubber body (2).

5. The five-lip rubber oil seal according to claim 1, characterized in that: It also comprises a third rubber body (5), wherein the third rubber body (5) wraps the vertical section (12), and a thread groove (51) is arranged on the outer side surface of the third rubber body (5).

6. The five-lip rubber oil seal according to claim 5, characterized in that: A plurality of protrusions (52) are arranged at the lower end of the third rubber body (5).

7. The five-lip rubber oil seal according to claim 5, characterized in that: The first rubber body (2) and the second rubber body (4) are an integral structure, and a first groove (43) is provided at the connection between the first rubber body (2) and the second rubber body (4); the third rubber body (5) and the second rubber body (4) are an integral structure, and a second groove (44) is provided at the connection between the third rubber body (5) and the second rubber body (4).

8. A sealing structure, comprising a mounting seat (7) and a rotating shaft (8), wherein a metal dust cover (9) is provided at the shaft shoulder of the rotating shaft (8), characterized in that: A five-lip rubber oil seal as claimed in any one of claims 1 to 7 is arranged between the mounting seat (7) and the rotating shaft (8), and the main lip (21), the outer auxiliary lip (23), and the inner auxiliary lip (24) are respectively abutted against the rotating shaft (8); the radial side lip (41) and the axial side lip (42) are respectively abutted against the metal dust cover (9); and the outer side surface of the third rubber body (5) is abutted against the mounting seat (7).

9. The sealing structure according to claim 8, characterized in that: The outer auxiliary lip (23) and the rotating shaft (8) are overfitted, with a fitting amount of 0±0.3 mm; the inner auxiliary lip (24) and the rotating shaft (8) are interference fitted, with an interference amount of 0.4±0.3 mm.

10. The sealing structure according to claim 8, characterized in that: The metal dust cover (9) comprises a first horizontal portion (91), the inner end of the first horizontal portion (91) is bent downward to form a first vertical portion (92), the outer end of the first horizontal portion (91) is bent downward to form a second vertical portion (93), the lower end of the second vertical portion (93) is bent outward to form a second horizontal portion (94), and the outer end of the second horizontal portion (94) is tilted upward to form a raised portion (95); the radial side lip (41) is abutted against the inner side of the second vertical portion (93), and the axial side lip (42) is abutted against the second horizontal portion (94).

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