A manually assembled oil pipe oil seal

Abstract

The present invention provides a manually assembled oil pipe oil seal, which comprises an oil seal body. The oil seal body includes a metal skeleton and a rubber part. The metal skeleton is of an annular structure, and a support part extending towards the middle of the opening is arranged on the outer wall of the metal skeleton. The rubber part is vulcanized around the metal skeleton. The rubber part includes a static seal inner part located inside the metal skeleton, a static seal outer part located outside the metal skeleton, a support inner part located inside the support part, and a support outer part located outside the support part. The static seal inner part, the static seal outer part, the support outer part, and the support inner part are connected end to end in sequence. A sealing lip is arranged at the connection between the static seal inner part and the support inner part. A plurality of raised sealing ribs are arranged at intervals on the outer side surface of the support outer part. The oil seal of the present invention does not require auxiliary tooling and can be manually pressed into the shell; it can follow the rotating shaft and has good followability; when the rotating shaft is in different positions, it can ensure that there is no oil leakage in the static seal between the rotating shaft and the oil seal and between the shell and the oil seal.

Description

Technical Field

[0001] The present invention relates to the technical field of oil seals, and particularly to an oil seal for a tubing that can be manually assembled. Background Art

[0002] Generally, the assembly of an oil seal requires the assistance of a tooling or an automatic device, and the assembly force is greater than 1000 N. However, for an oil seal of a tubing, it is required to be pressed in by hand, which means that the pressing force cannot exceed 180 N. At the same time, it is necessary to ensure that the oil seal has sufficient sealing ability to ensure no oil leakage between the oil seal and the housing and between the oil seal and the shaft surface. Existing oil seals are difficult to meet the above requirements. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention proposes an oil seal for a tubing that can be manually assembled.

[0004] An oil seal for a tubing that can be manually assembled proposed by the present invention includes an oil seal body assembled between a generator housing and a rotating shaft. The oil seal body includes a metal skeleton and a rubber part. The metal skeleton is a ring structure with an opening in the middle, and a support part extending towards the middle of the opening is provided on the outer wall of the metal skeleton. The rubber part is vulcanized around the metal skeleton. The rubber part includes a static seal inner part located inside the metal skeleton, a static seal outer part located outside the metal skeleton, a support inner part located inside the support part, and a support outer part located outside the support part. The static seal inner part, the static seal outer part, the support outer part, and the support inner part are connected end to end in sequence. A sealing lip is provided at the connection between the static seal inner part and the support inner part. A plurality of protruding annular sealing ribs are spaced apart on the outer side surface of the support outer part.

[0005] Preferably, the number of the annular sealing ribs is two.

[0006] Preferably, the distance between two adjacent sealing ribs is 1.75 - 1.85 mm.

[0007] Preferably, the cross-section of the annular sealing rib is triangular.

[0008] Preferably, the interference fit between the support outer part and the generator housing is 0.12 - 0.16 mm.

[0009] Preferably, the sealing lip includes an inner side surface and an outer side surface. A straight surface A is provided at a position on the inner side surface close to the outer side surface, and an arc surface B that is recessed inward is provided at a position on the outer side surface close to the support inner part.

[0010] Preferably, a resilient sealing structure is provided at the connection between the support inner part and the support outer part.

[0011] Preferably, the resilient sealing structure includes a first inclined surface C, a straight surface D, and a second inclined surface E. The first inclined surface is connected to the support outer part, and the second inclined surface is connected to the support inner part.

[0012] A manually assembled oil pipe oil seal proposed by the present invention does not require auxiliary tooling and can be manually pressed into the housing; it can follow the rotating shaft and has good followability; when the rotating shaft is in different positions, it ensures that there is no oil leakage in the static seal between the rotating shaft and the oil seal, and there is no oil leakage in the static seal between the housing and the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a manually assembled oil pipe oil seal proposed by the present invention;

[0014] Figure 2 It is a schematic assembly structure diagram of a manually assembled oil pipe oil seal proposed by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Referring to Figure 1 、 Figure 2 The present invention proposes a manually assembled oil pipe oil seal, which includes an oil seal body assembled between a generator housing b and a rotating shaft a. The oil seal body includes a metal skeleton 1 and a rubber part 2; wherein:

[0016] The metal skeleton 1 is an annular structure with an opening in the middle, and a support part 11 extending towards the middle of the opening is provided on the outer wall of the metal skeleton 1.

[0017] The rubber part 2 is vulcanized around the metal skeleton 1. The rubber part 2 includes a static seal inner part 21 located inside the metal skeleton 1, a static seal outer part 22 located outside the metal skeleton 1, a support inner part 23 located inside the support part 11, and a support outer part 24 located outside the support part 11. The static seal inner part 21, the static seal outer part 22, the support outer part 24, and the support inner part 23 are connected end to end in sequence. A sealing lip 25 is provided at the connection between the static seal inner part 21 and the support inner part 23. Two raised annular sealing ribs 26 are spaced on the outer surface of the support outer part 24. The cross-section of the annular sealing rib 26 is triangular, and the distance between adjacent two sealing ribs is 1.8 mm. The interference between the support outer part 24 and the generator housing is 0.15 mm.

[0018] The present invention optimizes the structural design and the number of the annular sealing ribs, changes the spacing of the annular sealing ribs from 0.8 mm to 1.8 mm, and designs 2 annular sealing ribs for radial static sealing; secondly, changes the interference between the outer circle of the oil seal and the housing b from the normal 0.25 mm to 0.15 mm. After the new outer circle design structure is calculated and analyzed by FEA, when the maximum interference state is formed between the product and the housing b, the pressing force does not exceed 150 N, which fully meets the requirements of manual pressing.

[0019] In this embodiment, the sealing lip 25 includes an inner side and an outer side. A straight surface A is provided at a position on the inner side close to the outer side, and an arc surface B that is recessed inward is provided at a position on the outer side close to the inner support portion 23. It is not only required that the contact surface between the outer circle and the housing b has radial static sealing ability, but also the contact surface between the end face and the rotating shaft a and the end face of the housing b have static sealing ability. The design of the straight surface A is to have a sufficient contact width with the rotating shaft a to ensure sealing; the design of the arc surface B is to have good flexibility and resilience for the oil pipe oil seal during the assembly process, so as to prevent it from being deformed or damaged by the rotating shaft. When the rotating shaft a is in different positions (the distance d between the rotating shaft a and the housing b is 1.7 - 3.7 mm), it still ensures that there is no oil leakage between the oil seal and the rotating shaft a, and no oil leakage between the oil seal and the housing b.

[0020] In this embodiment, an elastic rebound sealing structure 27 is provided at the connection between the inner support portion 23 and the outer support portion 24. The rebound sealing structure 27 includes a first inclined surface C, a straight surface D, and a second inclined surface E. The first inclined surface is connected to the outer support portion 24, and the second inclined surface is connected to the inner support portion 23. The design of the elastic rebound sealing structure 27: The design of the first inclined surface C ensures that when the rotating shaft a presses the oil seal, the rebound sealing structure 27 of the oil seal moves towards the oil side and fits with the F surface of the housing b, ensuring that the oil does not leak from the F surface; the design of the straight surface D can provide a certain amount of rebound force when the straight surface D contacts the F surface of the housing, supporting the entire oil seal from being "easily" pressed down by the rotating shaft a, indirectly providing a supporting force for the sealing lip 25 and ensuring no oil leakage between the sealing lip 25 and the rotating shaft. Due to the existence of the rebound sealing structure 27, it meets the requirement that the oil seal still has good sealing performance when the rotating shaft a is in different press-fitting positions.

[0021] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A manually assembled oil pipe oil seal, characterized in that, it includes an oil seal body assembled between the generator housing and the rotating shaft. The oil seal body includes a metal skeleton (1) and a rubber part (2); the metal skeleton (1) is an annular structure with an opening in the middle, and a support part (11) extending towards the generator housing is provided on the outer wall of the metal skeleton (1); the rubber part (2) is vulcanized around the metal skeleton (1), and the rubber part (2) includes a static seal inner part (21) located inside the metal skeleton (1), a static seal outer part (22) located outside the metal skeleton (1), a support inner part (23) located inside the support part (11), and a support outer part (24) located outside the support part (11). The static seal inner part (21), the static seal outer part (22), the support outer part (24), and the support inner part (23) are connected end to end in sequence. A sealing lip (25) is provided at the connection between the static seal inner part (21) and the support inner part (23). A plurality of protruding annular sealing ribs (26) are provided at intervals on the outer side surface of the support outer part (24); The sealing lip (25) includes an inner side surface and an outer side surface. A straight surface A is provided at a position on the inner side surface of the sealing lip (25) close to the outer side surface of the sealing lip (25). An arc surface B recessed inward is provided at a position on the outer side surface of the sealing lip (25) close to the support inner part (23); An elastic rebound sealing structure (27) is provided at the connection between the support inner part (23) and the support outer part (24); The rebound sealing structure (27) includes a first inclined surface C, a straight surface D, and a second inclined surface E. The first inclined surface C is connected to the support outer part (24), and the second inclined surface E is connected to the support inner part (23).

2. The manually assembled oil pipe oil seal according to claim 1, characterized in that, the number of the annular sealing ribs (26) is two.

3. The manually assembled oil pipe oil seal according to claim 1, characterized in that, the distance between two adjacent annular sealing ribs (26) is 1.75 - 1.85 mm.

4. The manually assembled oil pipe oil seal according to any one of claims 1 - 3, characterized in that, the cross-section of the annular sealing rib (26) is triangular.

5. The manually assembled oil pipe oil seal according to any one of claims 1 - 3, characterized in that, the interference amount between the support outer part (24) and the generator housing is 0.12 - 0.16 mm.

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