CN217152980U

CN217152980U - Combined oil seal with external silt-proof lip

Info

Publication number: CN217152980U
Application number: CN202221174834.0U
Authority: CN
Inventors: 盛明蕾
Original assignee: Chengdu Century Sun Sealing Co ltd
Current assignee: Chengdu Century Sun Sealing Co ltd
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2022-08-09
Anticipated expiration: 2032-05-11

Abstract

The utility model discloses a combined oil seal with an external silt-proof lip, which comprises an inner oil seal and an outer oil seal; one side of the inner oil seal is tightly contacted with the rotating shaft, and the other side of the inner oil seal is provided with a cavity with an opening; one end of the outer oil seal is positioned in the cavity of the inner oil seal, and the other end of the outer oil seal is in bearing contact with the end part of the rotating shaft; and a friction shaft surface is arranged on one side of the opening of the cavity of the inner oil seal, and an outer lip is arranged at the position where the outer oil seal is contacted with the friction shaft surface. The utility model discloses change current conventional structure, increase the outer lip mouth of the outer oil blanket of combination formula oil blanket, form the interference with the friction axial plane of interior oil blanket, can effectively prevent inside silt dust gets into the seal, strengthened the silt prevention ability of combination formula oil blanket to effectively prevent the early inefficacy of combination formula oil blanket.

Description

Combined oil seal with external silt-proof lip

Technical Field

The utility model relates to a sealing member technical field, concretely relates to combination formula oil blanket of silt lip is prevented outward in area.

Background

An oil seal (oil seal) is a common name of a general seal, and simply called a seal of lubricating oil. The oil seal is a mechanical element for sealing grease, and separates a part needing lubrication in a transmission part from a force-applying part, so that lubricating oil is prevented from leaking. The representative form of the oil seal is a TC oil seal, which is a rubber fully-coated double-lip oil seal with a self-tightening spring, and the general oil seal is often referred to as the TC framework oil seal.

The oil seal applied to machinery generally has the disadvantages of severe working conditions, large environmental temperature difference and much dust. In recent years, oil seal manufacturers and users make many adjustments on the aspects of production, process and the like of the oil seal manufacturers and the users aiming at factors which can cause leakage, the quality level of the oil seal and the quality level of assembly are greatly improved, but the phenomenon of sealing failure of the oil seal still occurs. Raised dust and raised sand produced by friction between the axle tire and the ground put higher requirements on the performance of the oil seal. Because the dustproof and waterproof capability and the sealing effect of the traditional oil seal are not ideal, the combined oil seal is now widely applied. However, the conventional combined oil seal has insufficient ability to prevent dust and sand from entering the seal chamber.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the ability that current ordinary combination formula oil blanket prevented dust and silt from getting into sealed chamber is not enough, and aim at provides a combination formula oil blanket of preventing silt lip outside the band, solves foretell problem.

The utility model discloses a following technical scheme realizes:

a combined oil seal with an outer silt-proof lip is characterized by comprising an inner oil seal and an outer oil seal; one side of the inner oil seal is tightly contacted with the rotating shaft, and the other side of the inner oil seal is provided with a cavity with an opening; one end of the outer oil seal is positioned in the cavity of the inner oil seal, and the other end of the outer oil seal is in bearing contact with the end part of the rotating shaft; and a friction shaft surface is arranged on one side of the opening of the cavity of the inner oil seal, and an outer lip is arranged at the position where the outer oil seal is contacted with the friction shaft surface.

Further, the inner oil seal comprises a first framework, a second framework, a third framework and a fourth framework; the first framework, the second framework, the third framework and the fourth framework are sequentially connected and enclose a cavity with an opening, and the friction axial surface is located at one end, far away from the third framework, of the fourth framework.

Further, interior oil blanket one side and pivot in close contact with specifically do: one side of the third framework of the inner oil seal, which is far away from the cavity, is in close contact with the rotating shaft.

Further, outer oil blanket includes outer oil blanket skeleton, the one end that outer oil blanket skeleton is located interior oil blanket cavity is equipped with main lip.

Further, the position that the outer oil seal framework is located at the lower part of the main lip is provided with a first auxiliary lip, a second auxiliary lip and a third auxiliary lip.

Furthermore, the outer lip is positioned in the middle of the outer oil seal framework, and the end part of the outer lip is in bearing contact with the friction shaft surface.

Further, a spring is arranged on the back side of the main lip; the main lip is deformed and attached to the surface of the third framework after being extruded by the spring.

Furthermore, a bulge is further arranged at the position, between the third auxiliary lip and the outer lip, of the outer oil seal framework; the bulge is in bearing contact with the fourth framework in the cavity.

Furthermore, one side of the third framework, which is in close contact with the rotating shaft, is provided with a wavy bulge for increasing friction force.

Further, first skeleton, second skeleton, third skeleton and fourth skeleton integrated into one piece.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model provides a pair of combination formula oil blanket of silt lip is prevented outward in band has strengthened the silt-proof ability of combination formula oil blanket to effectively prevent the early inefficacy of combination formula oil blanket.

2. The utility model provides a pair of combination formula oil blanket of silt lip is prevented outward in area changes current conventional structure, increases the outer lip of the outer oil blanket of combination formula oil blanket, forms the interference with the axial plane of interior oil blanket, can effectively prevent inside silt dust gets into the seal.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

fig. 2 is a partially enlarged sectional view of an embodiment of the present invention;

fig. 3 is a partial enlarged cross-sectional view of an inner oil seal according to an embodiment of the present invention;

fig. 4 is a partial enlarged cross-sectional view of an outer oil seal according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-inner oil seal, 2-outer oil seal, 3-rotating shaft, 11-first framework, 12-second framework, 13-third framework, 14-fourth framework, 15-friction shaft surface, 132-wave-shaped bulge, 21-main lip, 22-first auxiliary lip, 23-second auxiliary lip, 24-third auxiliary lip, 25-bulge, 26-outer lip, 27-spring and 28-outer oil seal framework.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1

The combined oil seal of the embodiment is used for sealing the wheel hub of a commercial vehicle. Embodiment 1 provides a combined oil seal with an outer silt-proof lip, as shown in fig. 1-2, a lip (corresponding to the outer lip 26 in fig. 2) is formed at a position a of the outer oil seal, and an axial surface (corresponding to the friction axial surface 15 in fig. 2) is formed at a position B of the inner oil seal, and the two are combined to form a lip sealing structure, so that the position is not provided with a gap to block the entrance of silt.

Preferably, as shown in fig. 1-2, the combined oil seal with the sand prevention lip comprises an inner oil seal 1 and an outer oil seal 2;

as shown in fig. 4, the inner oil seal 1 includes a first skeleton 11, a second skeleton 12, a third skeleton 13, and a fourth skeleton 14; the first framework 11, the second framework 12, the third framework 13 and the fourth framework 14 are sequentially connected and enclose a cavity with an opening, and a friction shaft surface 15 is arranged at one end, far away from the third framework 13, of the fourth framework 14. One side of the third framework 13 of the inner oil seal 1, which is far away from the cavity, is in close contact with the rotating shaft 3, and the position of the third framework 13 in close contact with the rotating shaft 3 is provided with a wavy bulge 132 for increasing the friction force. Preferably, in order to increase the strength and reliability of the inner oil seal 1, the utility model discloses a first skeleton 11, second skeleton 12, third skeleton 13 and fourth skeleton 14 can make integrated into one piece's inner oil seal 1.

As shown in fig. 3, the outer oil seal 2 is similar to an L shape, one end of the outer oil seal 2 is located in the cavity of the inner oil seal 1, and the other end of the outer oil seal is in force-bearing contact with the end part of the rotating shaft 3; an outer lip 26 is arranged at the position where the outer oil seal 2 contacts with the friction shaft surface 15. The outer oil seal 2 comprises an outer oil seal framework 28, and a main lip 21 is arranged at one end, located in the cavity of the inner oil seal 1, of the outer oil seal framework 28. The outer oil seal framework 28 is provided with a first auxiliary lip 22, a second auxiliary lip 23 and a third auxiliary lip 24 at the position of the lower part of the main lip 21. The outer lip 26 is located in the middle of the outer oil seal framework 28, and the end of the outer lip 26 is in bearing contact with the friction shaft surface 15. A spring 27 is arranged on the back side of the main lip 21; the main lip 21 is deformed and attached to the surface 13 after being pressed by the spring 27. A bulge 25 is further arranged at a position, between the third auxiliary lip 24 and the outer lip 26, of the outer oil seal framework 28; the protrusion 25 is in contact with a force bearing part of the fourth skeleton 14 in the cavity.

Example 2

This embodiment 2 provides a combination formula oil blanket of silt lip is prevented outward in area, and this embodiment is different from

embodiment

1, and 26 tip orientations of outer lip and friction axial plane 15 become thirty degrees contained angles, because outer lip 26 has certain elasticity, make the inseparabler of 26 tip of outer lip and the 15 butt of friction axial plane like this, block that the effect that silt got into is better.

As shown in fig. 3, the outer oil seal 2 is similar to an L shape, one end of the outer oil seal 2 is located in the cavity of the inner oil seal 1, and the other end of the outer oil seal is in force-bearing contact with the end part of the rotating shaft 3; in order to make the end of the outer lip 26 abut against the friction shaft surface 15 more tightly and to make the effect of blocking the entrance of silt better, the outer lip 26 is arranged at the position where the outer oil seal 2 contacts the friction shaft surface 15, and the end of the outer lip 26 faces towards the position which forms an included angle of thirty degrees with the friction shaft surface 15.

As shown in fig. 3, the outer oil seal 2 includes an outer oil seal framework 28, one end of the outer oil seal framework 28 located in the cavity of the inner oil seal 1 is provided with a main lip 21, and the main lip 21 is matched with the first groove 131. The outer oil seal framework 28 is provided with a first auxiliary lip 22, a second auxiliary lip 23 and a third auxiliary lip 24 at the position of the lower part of the main lip 21, and the auxiliary lip 22, the second auxiliary lip 23, the third auxiliary lip 24, the bulge 25 and the outer lip 26 deform and attach to the surface of the oil seal framework 13 after being pressed. The outer lip 26 is located in the middle of the outer oil seal framework 28, and the end of the outer lip 26 is in bearing contact with the friction shaft surface 15. The main lip 21 is provided with a spring 27 on the back side. A bulge 25 is further arranged at a position, between the third auxiliary lip 24 and the outer lip 26, of the outer oil seal framework 28; the protrusion 25 is in contact with a force bearing part of the fourth skeleton 14 in the cavity.

The second sub lip 23 and the third sub lip 24 in this embodiment form a certain included angle with the fourth skeleton 14, preferably, the included angle may be sixty degrees, and the arrangement may make the sealing effect between the second sub lip 23 and the third sub lip 24 and the fourth skeleton 14 better.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A combined oil seal with an outer silt-proof lip is characterized by comprising an inner oil seal (1) and an outer oil seal (2); one side of the inner oil seal (1) is tightly contacted with the rotating shaft (3), and the other side is provided with a cavity with an opening; one end of the outer oil seal (2) is positioned in the cavity of the inner oil seal (1), and the other end of the outer oil seal is in bearing contact with the end part of the rotating shaft (3); a friction shaft surface (15) is arranged on one side of the cavity opening of the inner oil seal (1), and an outer lip (26) is arranged at the position where the outer oil seal (2) is in contact with the friction shaft surface (15).

2. The combined oil seal with the sand and mud preventing lip opening outside the belt as claimed in claim 1, wherein the inner oil seal (1) comprises a first framework (11), a second framework (12), a third framework (13) and a fourth framework (14); the first framework (11), the second framework (12), the third framework (13) and the fourth framework (14) are sequentially connected and enclose a cavity with an opening, and the friction axial surface (15) is located at one end, far away from the third framework (13), of the fourth framework (14).

3. The combined oil seal with the sand prevention lip outside the belt as claimed in claim 2, wherein one side of the inner oil seal (1) is in close contact with the rotating shaft (3), specifically: one side of the third framework (13) of the inner oil seal (1), which is far away from the cavity, is in close contact with the rotating shaft (3).

4. The combined oil seal with the outer silt-proof lip of claim 2, wherein the outer oil seal (2) comprises an outer oil seal framework (28), and a main lip (21) is arranged at one end of the outer oil seal framework (28) located in the cavity of the inner oil seal (1).

5. The combined oil seal with the sand and sand prevention lip outside the belt as claimed in claim 4, wherein the outer oil seal framework (28) is provided with a first auxiliary lip (22), a second auxiliary lip (23) and a third auxiliary lip (24) at the position below the main lip (21).

6. The combined oil seal with the outer silt-proof lip as claimed in claim 1, wherein the outer lip (26) is located in the middle of the outer oil seal framework (28), and the end of the outer lip (26) is in bearing contact with the friction shaft surface (15).

7. The combined oil seal with the sand and sand preventing lip outside the belt as claimed in claim 5, wherein a spring (27) is arranged at the back side of the main lip (21); the main lip (21) is deformed and attached to the surface of the third framework (13) after being extruded by the spring (27).

8. The combined oil seal with the outer silt-proof lip as claimed in claim 5, wherein a protrusion (25) is further arranged at a position of the outer oil seal framework (28) between the third auxiliary lip (24) and the outer lip (26); the bulge (25) is in bearing contact with the fourth framework (14) in the cavity.

9. The combined oil seal with the sand and sand preventing lip outside the belt as claimed in claim 3, wherein the third framework (13) is provided with a wave-shaped bulge (132) for increasing the friction force at the side which is in close contact with the rotating shaft (3).

10. The combined oil seal with the sand and mud preventing lip opening as claimed in claim 2, wherein the first framework (11), the second framework (12), the third framework (13) and the fourth framework (14) are integrally formed.