Oil seal and production method therefor

A technology for oil seals and sealing lips, which is applied in the field of oil seals and its manufacture, can solve the problems of lower friction coefficient, lower sealing performance, hard coating, etc., and achieve the effect of low friction and enhanced adhesion

Active Publication Date: 2008-06-18
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this prior art is that in order to reduce the coefficient of friction, the sliding part has a structure in which the shaft is in contact only through the resin layer, so the contact state between the sliding part and the shaft is unstable, resulting in a problem of reduced sealing performance.
In addition, in this prior art, polyimide resin or epoxy re

Method used

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  • Oil seal and production method therefor
  • Oil seal and production method therefor
  • Oil seal and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0062] In order to avoid the deficiencies in the above-mentioned existing technology, the coating method of coating the sliding surface of the lip with a low-friction coating that has a strong bond with the base material and will not cause initial peeling due to sliding is listed below.

[0063] (1) A binder component (isocyanate-modified polybutadiene resin) that can be firmly bonded to the base material is mixed with PTFE, and a solution diluted with a solvent is used.

[0064] (2) Spray the solution shown in the above item (1) on the atmospheric side of the sliding surface of the lip before cutting.

[0065] (3) Dry and solidify by air heating.

[0066] (4) After the treatment in item (3) above, the main lip is processed by cutting.

[0067] The coated surface is formed only on the air side sliding surface through the coating agent application, heat treatment, and main lip processing steps in the above items (2) to (4).

Embodiment approach 2

[0069] A method for achieving low friction of a sealing lip in an oil seal, comprising: applying a coating solution composed of fluororesin, polyethylene resin, isocyanate-modified polybutadiene resin and a solvent to the atmosphere of the sealing lip The process of side sliding surface; the process of sintering and drying after coating; the process of forming the sealing fluid side sliding surface on the sealing lip by cutting after drying.

Embodiment approach 3

[0071] The coating film applicable to the present invention is described in detail below.

[0072] That is, for 100 parts by mass of 1,2-polybutadiene containing isocyanate groups or a 1,2-polybutadiene mixture mixed with 1,2-polybutadiene containing hydroxyl groups, A polyethylene resin and a fluororesin are mixed in a ratio of 10 to 160 parts by mass to form an organic solvent solution, and the coating agent for vulcanized rubber thus constituted is applied to the air-side slope of the lip sliding portion.

[0073] As the isocyanate group-containing 1,2-polybutadiene, one having a molecular weight of 1,000 to 3,000 to which an isocyanate group is added to a terminal group can be used. Commercially available products such as Nippon Soda Products Nippon Soda TP-1001 (solution containing 50% by weight of butyl acetate) and the like can be used as they are. This polybutadiene resin is characterized in that it has better compatibility and compatibility with rubber, better adhesi...

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Abstract

This invention provides an oil seal that can maintain an excellent friction reduction function over a long period of time, has excellent abrasion resistance, and further has excellent sealing properties. The oil seal comprises a seal lip (4) formed of a rubber-like elastic material comprising a lip edge part (9) and an air-side slope (8) and a sealing fluid-side slope (10) provided on both sides of the lip edge part (9). The air-side slope (8) has a coating film (14) on its surface. In the lip edge part (9) in its portion in contact with a shaft (13), a sealing fluid-side rubber part (2') and an air-side coating film (14) are simultaneously brought into contact with the shaft (13). The coating film (14) is preferably formed of a coating agent comprising a fluororesin, a polyethylene resin, an isocyanate-modified polybutadiene resin, and a solvent.

Description

technical field [0001] The invention relates to an oil seal, one of the sealing devices, and a manufacturing method thereof. Background technique [0002] As means for reducing the sliding resistance of the sealing lip in the oil seal, two methods are known: (1) reducing the pressing force of the shaft against the sliding object; or (2) reducing the friction coefficient of the lip sliding portion. [0003] However, according to the former method (1), as the pressing force against the shaft decreases, the length of the lip needs to be set shorter, so it is difficult to design a lip that can simultaneously have good followability to the shaft under high eccentricity conditions. Therefore, there is a problem that the sliding resistance cannot be greatly reduced. In addition, regarding the latter method (2), a method of coating various films on the sliding part of the lip has been considered, but it is disadvantageous in that due to the initial wear of the coating film, it will...

Claims

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Application Information

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IPC IPC(8): F16J15/32
CPCF16J15/324F16J15/3244F16J15/32
Inventor 武野一记古山秀之谷田昌幸松井宏树渡边竜彦宗形忍山口啓水田裕贤国枝贤一东良敏弘
Owner NOK CORP
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