Dustproof lip oil seal

Abstract

The present invention discloses a dustproof lip oil seal, which comprises an oil seal body, wherein the oil seal body has a first lip, and the first lip is covered with a second lip, the second lip is used to reduce the accumulation of mud and dust on the first lip, and a chamber for temporarily storing mud and dust is formed between the first lip and the second lip, and the second lip is provided with a plurality of through holes, which are connected with the chamber and are used to discharge the mud and dust temporarily stored in the chamber. In this way, by arranging the second lip to cover the outside of the first lip, it is beneficial to reduce the accumulation of external mud and dust on the first lip and improve the dustproof effect.

Description

Technical Field

[0001] The invention relates to a shock absorber seal, in particular to a dustproof lip oil seal. Background Art

[0002] The working environment of the shock absorber is relatively harsh, with working temperatures between -45°C and 300°C. The operating environment includes harsh conditions such as a lot of mud and dust, and the product may leak oil. Oil leakage in muddy conditions is mostly caused by the poor dustproof performance of the oil seal.

[0003] Traditional oil seals use a single-layer dustproof lip, which relies on the interference fit of the rubber itself to maintain the sealing force of the lip or relies on a spring to continuously maintain the sealing force of the dustproof lip; this design has three defects: 1. The single-layer dustproof lip has functional limitations, that is, when there is a lot of mud and sand, it brings huge dustproof pressure to the dustproof lip of the oil seal, causing the dustproof lip to deform and fail; 2. The lip pressure is maintained by the elastic force of the rubber itself. After the product has been used for a period of time, high and low temperatures and time will reduce the elasticity of the rubber, reduce the lip pressure, and reduce the dustproof performance; 3. The sealing force of the dustproof lip is continuously maintained by a spring. The spring will decay in force after long-term use or rust, reduce the lip pressure, and reduce the dustproof performance.

[0004] Therefore, it is necessary to provide a dustproof lip oil seal to solve the problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of poor dustproof effect in the prior art and to propose a dustproof lip oil seal.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a dustproof lip oil seal, which includes an oil seal body, the oil seal body has a first lip, the first lip is covered with a second lip, the second lip is used to reduce the accumulation of mud and dust on the first lip, a chamber for temporarily storing mud and dust is formed between the first lip and the second lip, and a plurality of through holes are provided on the second lip, which are connected with the chamber and are used to discharge the mud and dust temporarily stored in the chamber.

[0007] The outer surface of the first lip forms a first inclined surface that slopes from inside to outside, and the chamber is surrounded by the first inclined surface and the inner surface of the second lip.

[0008] The second lip is sleeved outside the first lip and is clamped with the first lip.

[0009] A clamping slot is disposed outside the first lip, and a clamping portion that is clamped with the clamping slot is correspondingly disposed on the second lip.

[0010] A second inclined surface is disposed on the inner surface of the second lip, and the second inclined surface is opposite to the first inclined surface.

[0011] The first inclined surface and the second inclined surface are parallel to each other or the inclination degree of the first inclined surface relative to the horizontal plane is greater than the inclination degree of the second inclined surface.

[0012] The outer surface of the second lip forms a third inclined surface which is inclined from the inside to the outside, and the inclination degree of the third inclined surface relative to the horizontal plane is smaller than the inclination degree of the second inclined surface.

[0013] A plurality of through holes are evenly arranged on the outer peripheral surface of the second lip, and the through holes are rectangular, trapezoidal or triangular.

[0014] In summary, due to the adoption of the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the present invention arranges the second lip cover outside the first lip, which is beneficial to reduce the accumulation of external mud and dust on the first lip and plays a secondary dust-proof role; a chamber is enclosed between the first lip and the second lip for temporarily storing mud and dust, and a plurality of through holes are provided on the second lip, which are connected with the chamber and are used to discharge the mud and dust temporarily stored in the chamber, thereby improving the dust-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the dustproof lip oil seal structure of the present invention;

[0016] Figure 2 for Figure 1 Exploded view of the middle dustproof lip oil seal;

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the middle dustproof lip oil seal from another angle;

[0018] Figure 4 for Figure 3 Cross-sectional view of the middle dustproof lip oil seal in the AA direction;

[0019] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of area A in the middle. DETAILED DESCRIPTION

[0020] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0021] Reference Figures 1 to 5The present invention is a dustproof lip oil seal, comprising an oil seal body 1, the oil seal body 1 having a first lip 2, the first lip 2 is covered with a second lip 3, and the second lip 3 is used to reduce the accumulation of external mud and dust on the first lip 2.

[0022] See also Figure 3 and Figure 5 A chamber 4 for temporarily storing mud, sand and dust is formed between the first lip 2 and the second lip 3. A plurality of through holes 5 are provided on the second lip 3. The through holes 5 are connected to the chamber 4 and are used to discharge the mud, sand and dust temporarily stored in the chamber 4.

[0023] In this embodiment, see Figure 2 and Figure 5 The outer surface of the first lip 2 forms a first inclined surface 21 that tilts from inside to outside. The through hole 5 is located at the outer end of the first inclined surface 21. The oil seal vibrates to facilitate the sand and dust to slide from the inner end to the outer end of the first inclined surface 21 under the action of gravity and be discharged outward through the through hole 5 to prevent the accumulation of sand and dust, thereby achieving the effect of improving the dust-proof effect of the product. In addition, the chamber 4 is surrounded by the first inclined surface 21 and the inner surface of the second lip 3. Figure 5 A second inclined surface 31 is provided on the inner surface of the second lip 3. The second inclined surface 31 is opposite to the first inclined surface 21. The second inclined surface 31 facilitates the introduction of mud and sand into the chamber 4 to prevent it from falling into the oil seal.

[0024] In this embodiment, a plurality of through holes 5 are evenly arranged on the outer peripheral surface of the second lip 3 , and the through holes 5 are rectangular, trapezoidal, triangular, or the like.

[0025] The first lip 2 and the second lip 3 can be integrated or separated. In this embodiment, the second lip 3 is sleeved outside the first lip 2 and is clamped with the first lip 2. Figure 5 The first lip 2 is provided with a slot 22, and the second lip 3 is provided with a corresponding holding portion 32 engaged with the slot 22, so as to realize the engagement between the second lip 3 and the first lip 2. The first lip 2 and the second lip 3 are separately provided, and the second lip 3 is demolded separately, eliminating the need for complex molds and saving costs.

[0026] In this embodiment, see Figure 2 or Figure 5 The outer surface of the second lip 3 forms a third inclined surface 33 which is inclined from the inside to the outside. The oil seal vibrates, which facilitates the sand and dust to slide from the inner end to the outer end of the third inclined surface 33 under the action of gravity, thereby preventing the sand and dust from accumulating on its surface.

[0027] In this embodiment, the first inclined surface 21 and the second inclined surface 31 can be parallel to each other, or the inclination of the first inclined surface 21 relative to the horizontal plane can be greater than the inclination of the second inclined surface 31, and the inclination of the third inclined surface 33 relative to the horizontal plane can be less than the inclination of the second inclined surface 31. Since the amount of mud, sand and dust entering the chamber 4 is small and the gravity is also small, by setting the inclination of the first inclined surface 21 to the maximum, the oil seal vibrates so that a small amount of mud, sand and dust can slide along the first inclined surface 21 to the through hole 5 and then be quickly discharged from the chamber 4.

[0028] See also Figure 5 The second lip 3 also includes a side portion 34 and a cover portion 35 integrally formed with the side portion 34. Specifically, the cover portion 35 covers the first lip 2 to prevent mud, sand and dust from entering the first lip 2, so as to reduce the accumulation of the first lip 2. The inner surface of the side portion 34, the inner surface of the cover portion 35 and the first inclined surface 21 form a chamber 4. Among them, the second inclined surface 31 is arranged on the inner side of the cover portion 35, and a plurality of through holes 5 are evenly arranged on the side portion 34.

[0029] The clamping portion 32 is disposed at the bottom end of the side portion 34 and extends inwardly from the bottom end of the side portion 34 . The covering portion 35 is located at the top end of the side portion 34 and extends inwardly from the top end of the side portion 34 .

[0030] Working principle of the present invention: the outer surface of the second lip 3 is provided with a third inclined surface 33 to minimize the accumulation of mud and dust on its surface; when there is some mud and dust accumulation, the third inclined surface 33 will shake off the mud and dust outside the second lip 3 when the oil seal vibrates, which can effectively reduce the accumulation of mud and a small amount of dust on the inner surface of the second lip 3; that is, the second lip 3 can effectively isolate 90% of the mud and dust, and 10% of the dust will fall on the outer surface of the first lip 2. The first lip 2 works to isolate the mud and dust and protect the integrity of the main lip of the oil seal; when continuous mud and dust accumulate on the outer surface of the first lip 2, the mud and dust will be shaken off on the outer surface of the first lip 2 when the product vibrates, and the mud and dust are temporarily stored in the chamber 4. The outer surface of the first lip 2 is provided with a first inclined surface 21, which can easily discharge the mud and dust to the through hole 5 through the first inclined surface 21, and finally discharge it to the outside of the oil seal assembly, preventing the accumulation of mud and dust, and achieving the effect of improving the dustproof of the product.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dustproof lip oil seal, characterized in that: The oil seal body (1) comprises an oil seal body (1), the oil seal body (1) having a first lip (2), the first lip (2) being covered with a second lip (3), the second lip (3) being used to reduce the accumulation of mud and dust on the first lip (2), a chamber (4) for temporarily storing mud and dust being formed between the first lip (2) and the second lip (3), the second lip (3) being provided with a plurality of through holes (5), the through holes (5) being connected with the chamber (4) and being used to discharge the mud and dust temporarily stored in the chamber (4); the second lip (3) being sleeved outside the first lip (2) and being clamped with the first lip (2); the outer surface of the first lip (2) forming a first inclined surface inclined from the inside to the outside (21), the chamber (4) is surrounded by the first inclined surface (21) and the inner surface of the second lip (3); the first lip (2) is provided with a slot (22) on the outside, and the second lip (3) is provided with a clamping portion (32) that is clamped with the slot (22); the inner surface of the second lip (3) is provided with a second inclined surface (31), and the second inclined surface (31) is opposite to the first inclined surface (21); the inclination of the first inclined surface (21) relative to the horizontal plane is greater than the inclination of the second inclined surface (31); the outer surface of the second lip (3) forms a third inclined surface (33) inclined from the inside to the outside, and the inclination of the third inclined surface (33) relative to the horizontal plane is less than the inclination of the second inclined surface (31); When some mud, sand, and dust accumulate, the third inclined surface (33) will shake off the mud, sand, and dust outside the second lip (3) when the oil seal vibrates, which can effectively reduce the accumulation of mud, sand, and a small amount of dust on the inner surface of the second lip (3).

2. The dustproof lip oil seal according to claim 1, characterized in that: A plurality of through holes (5) are evenly arranged on the outer peripheral surface of the second lip (3), and the through holes (5) are rectangular, trapezoidal or triangular.

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