Oil seal with multiple sealing tapes

Abstract

The utility model discloses an oil seal with a plurality of sealing tapes, which relates to the technical field of oil seals and particularly comprises an elastic annular support body, the inner surface of the annular support body is provided with the plurality of sealing tapes, the outer surface of the annular support body is provided with at least one first annular groove, and one side of the annular support body is provided with an annular cavity. At least one second annular groove is formed in the surface of one side, close to the center of the annular support body, of the annular cavity; elastic tightening pieces are arranged in the first annular groove and the second annular groove correspondingly, and the sealing belt is driven by the elastic tightening pieces to make close contact with the surface of the shaft. When the oil seal is used, after the oil seal is sleeved on a shaft, the annular support body is tightened by the elastic tightening piece, so that the arc-shaped connecting part is tightly held on the surface of the shaft, a plurality of sealing structures are formed in the annular support body, and a better sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to an oil seal with multiple sealing strips. Background Art

[0002] The oil seal is a seal for lubricating oil. It isolates the parts that need lubrication in the transmission components from the output components to prevent the lubricating oil from leaking. For example, when the pump is running, the pump shaft must be well sealed to operate normally.

[0003] Existing shaft seals are all made of rubber. After being put on the shaft, the seal is tightly attached to the shaft surface by the extrusion force of the seal hole, thus achieving a sealing effect. However, the inner surface of existing shaft seals is mostly smooth, which makes it easy for oil to leak after long-term use. To solve this problem, we propose an oil seal with multiple sealing strips. Utility Model Content

[0004] In view of the shortcomings of the existing shaft seal that the inner surface is smooth and easy to leak oil, the utility model provides an oil seal with multiple sealing belts, which has the advantages of multiple sealing belts and the sealing belts are tightened by annular springs, solving the problems raised in the above background technology.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] An oil seal with multiple sealing strips is designed, comprising an elastic annular support body, wherein multiple sealing strips are arranged on the inner surface of the annular support body;

[0007] The outer surface of the annular support body is provided with at least one first annular groove;

[0008] An annular cavity is provided on one side of the annular support body, and at least one second annular groove is provided on the surface of one side of the annular cavity close to the center of the annular support body;

[0009] Wherein, elastic tightening members are provided in both the first annular groove and the second annular groove, and driven by the elastic tightening members, the sealing belt is in close contact with the shaft surface.

[0010] Preferably, the elastic tightening member is an annular spring or a clip spring.

[0011] Preferably, a dust lip is provided on the inner edge of the annular support body away from the annular cavity.

[0012] Preferably, an elastic support body is provided in the annular support body.

[0013] Preferably, the elastic support body comprises a first annular support plate, the outer edge of the first annular support plate is connected to the second annular support plate, and the inner edge thereof is connected to a plurality of second strip-shaped sheets arranged at intervals;

[0014] The first annular support plate, the second annular support plate and the second strip sheet form a "U"-shaped structure, and the annular cavity is placed in the "U"-shaped structure;

[0015] The bottom of each second strip piece is connected to the first strip piece through an arc-shaped connecting portion, and the first strip piece is parallel to the central axis of the annular support body.

[0016] Preferably, a plurality of openings are provided on the surface of the second annular support plate, so that the second annular support plate has a multi-petal structure.

[0017] Preferably, the second annular support plate and the second strip sheet are arranged in a V shape.

[0018] Preferably, the surface height of the elastic tightening member is lower than the height of the first annular groove.

[0019] Compared with the prior art, when the present invention is in use, after the oil seal is sleeved on the shaft, the annular support body is tightened by the elastic tightening piece, so that the arc-shaped connecting part tightly embraces the surface of the shaft, and a multi-channel sealing structure is formed inside the annular support body, which has a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 It is a three-dimensional cross-sectional view of the utility model.

[0022] Figure 3 It is a planar sectional view of the utility model.

[0023] Figure 4 Schematic diagram of the elastic support structure of the utility model Figure 1 .

[0024] Figure 5 Schematic diagram of the elastic support structure of the utility model Figure 2 .

[0025] In the figure: 1. Sealing belt; 2. Annular cavity; 3. Annular support body; 4. First annular groove; 5. Annular spring; 6. Second strip piece; 7. Second annular groove; 8. Dust lip; 9. First annular support plate; 10. First strip piece; 11. Arc-shaped connecting portion; 12. Second annular support plate; 13. Opening. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figures 1 to 5 The utility model provides a technical solution: an oil seal with multiple sealing strips, comprising an elastic annular support body 3, the material of the annular support body 3 is rubber, and multiple sealing strips 1 are provided on the inner surface of the annular support body 3. The sealing strips 1 are an integral structure with the annular support body 3, making the sealing strips more stable. The cross-section of the sealing strips 1 can be V-shaped, isosceles trapezoidal or arc-shaped;

[0028] The outer surface of the annular support body 3 is provided with at least one first annular groove 4, and an elastic tightening member is provided in the first annular groove 4. The surface height of the elastic tightening member is lower than the height of the first annular groove 4, so that the elastic tightening member is always hidden in the first annular groove 4 and not exposed, avoiding the elastic tightening member from contacting external objects. Under the tightening action of the elastic tightening member, the annular support body 3 is contracted inward as a whole, so that the annular support body 3 is tightly clamped to the surface of the shaft.

[0029] like Figure 1 As shown, an annular cavity 2 is provided on one side of the annular support body 3. In actual use, the annular cavity 2 faces the direction of the oil. At least one second annular groove 7 is provided on the surface of the annular cavity 2 near the center of the annular support body 3. An elastic tightening member is also provided in the second annular groove 7. Under the tightening action of the elastic tightening member, the annular support body 3 at the position of the annular cavity 2 is caused to shrink inward as a whole, thereby increasing the extrusion force between the sealing belt 1 at the annular cavity 2 and the shaft surface, thereby achieving a better sealing effect.

[0030] Specifically, when the present invention is in use, after the annular support body 3 is sleeved on the shaft, the elastic tightening members provided in the first annular groove 4 and the second annular groove 7 have the ability to tighten inward, so that the annular support body 3 is driven by the elastic tightening members to allow the sealing belt 1 to be in close contact with the shaft surface;

[0031] First, the annular support body 3 is provided with a second annular groove 7 facing the oil. The second annular groove 7 is tightened by an elastic tightening member to seal the side of the annular support body 3 facing the oil.

[0032] Then the annular support body 3 is tightened by the elastic tightening member provided in the first annular groove 4 so that the annular support body 3 is entirely tightly held on the shaft, achieving a better sealing effect.

[0033] It should be noted that the elastic tightening member is an annular spring 5 or a retaining spring (hereinafter referred to as annular spring 5). If a retaining spring is selected, there should be no distance between the two ends of the retaining spring. The two ends of the retaining spring should be staggered together to avoid a gap between the two ends of the retaining spring, resulting in poor sealing effect.

[0034] Furthermore, the side of the annular support 3 away from the oil is improved, such as Figure 1 and Figure 2 As shown, a dust lip 8 is provided at the inner edge of the annular support body 3 away from the annular cavity 2. The dust lip 8 and the annular support body 3 are an integral structure, which increases the stability of the dust lip 8. The dust lip 8 is tightly clamped on the shaft, which can prevent external dust from entering the interior of the oil seal.

[0035] Since the annular support body 3 is made of rubber, it has an elastic sealing function and is also easily deformed. Therefore, in order to allow the annular support body 3 to undergo a large deformation, an elastic support body can be provided inside the annular support body 3. The elastic support body includes a first annular support plate 9. The outer edge of the first annular support plate 9 is connected to a second annular support plate 12, and the inner edge is connected to a plurality of spaced second strip sheets 6.

[0036] like Figure 3 As shown, the first annular support plate 9, the second annular support plate 12 and the second strip sheet 6 form a "U"-shaped structure, and the annular cavity 2 is placed in the "U"-shaped structure;

[0037] The bottom of each second strip piece 6 is connected to the first strip piece 10 through an arc-shaped connecting portion 11. The first strip piece 10 is parallel to the central axis of the annular support body 3. Figure 5 As shown, multiple openings 13 are further provided on the surface of the second annular support plate 12, giving the second annular support plate 12 a multi-petal structure, which allows the second annular support plate 12 to have greater elasticity. Furthermore, the second strip 6 rebounds toward the interior of the annular support body 3, while the second annular support plate 12 rebounds toward the exterior of the annular support body 3. This allows for a tighter fit between the outer wall of the annular support body 3 and the oil seal groove. Simultaneously, the second strip 6 and the elastic tightening member located in the second annular groove 7 can jointly compress the sealing strip 1, further tightening the sealing strip 1 against the shaft surface.

[0038] Furthermore, the second annular support plate 12 and the second strip piece 6 are distributed in a "V" shape, that is, the angle between the second annular support plate 12 and the second strip piece 6 is wide-mouthed.

[0039] In summary, after the oil seal proposed in the present application is sleeved on the shaft, the annular support body 3 can seal the shaft and the hole by virtue of its own elasticity. Moreover, under the tightening of the annular spring 5, the annular support body 3 allows the arc-shaped connecting portion 11 on the inner surface of the annular support body 3 to tightly embrace the surface of the shaft, so that a multi-layer sealing structure is formed inside the annular support body 3, achieving a better sealing effect.

[0040] The plurality of first strip-shaped sheets 10 can be tightened toward the shaft surface simultaneously under the tightening of the annular spring 5 , thereby ensuring the stable operation of the annular support body 3 .

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Furthermore, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil seal with multiple sealing strips, comprising an elastic annular support (3), characterized in that: A plurality of sealing strips (1) are provided on the inner surface of the annular support body (3); The outer surface of the annular support body (3) is provided with at least one first annular groove (4); An annular cavity (2) is provided on one side of the annular support body (3), and at least one second annular groove (7) is provided on a surface of one side of the annular cavity (2) close to the center of the annular support body (3); Wherein, elastic tightening members are provided in both the first annular groove (4) and the second annular groove (7), and driven by the elastic tightening members, the sealing belt (1) is brought into close contact with the shaft surface.

2. The oil seal with multiple sealing strips according to claim 1, characterized in that: The elastic tightening member is an annular spring (5) or a clip spring.

3. The oil seal with multiple sealing strips according to claim 2, characterized in that: A dustproof lip (8) is provided at the inner edge of the annular support body (3) on a side away from the annular cavity (2).

4. The oil seal with multiple sealing strips according to claim 3, characterized in that: An elastic support body is provided inside the annular support body (3).

5. The oil seal with multiple sealing strips according to claim 4, characterized in that: The elastic support body comprises a first annular support plate (9), the outer edge of the first annular support plate (9) is connected to a second annular support plate (12), and the inner edge is connected to a plurality of second strip-shaped sheets (6) arranged at intervals; The first annular support plate (9), the second annular support plate (12) and the second strip sheet (6) form a "U"-shaped structure, and the annular cavity (2) is placed in the "U"-shaped structure; The bottom of each second strip-shaped piece (6) is connected to the first strip-shaped piece (10) via an arc-shaped connecting portion (11), and the first strip-shaped piece (10) is parallel to the central axis of the annular support body (3).

6. The oil seal with multiple sealing strips according to claim 5, characterized in that: A plurality of openings (13) are provided on the surface of the second annular support plate (12), so that the second annular support plate (12) presents a multi-petal structure.

7. The oil seal with multiple sealing strips according to claim 1, characterized in that: The second annular support plate (12) and the second strip sheet (6) are arranged in a V-shape.

8. The oil seal with multiple sealing strips according to claim 2, characterized in that: The surface height of the elastic tightening member is lower than the height of the first annular groove (4).

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