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Seal ring

A sealing ring and resin composition technology, applied in the field of sealing rings, can solve the problems of volume expansion, difficulty in applying AT sealing rings, high water absorption, and achieve the effects of low water absorption, excellent dimensional stability, and prevention of abrasive wear.

Inactive Publication Date: 2014-01-22
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, compared with PPS and PEEK, PA-based materials have higher water absorption and volume expansion due to water absorption, so it is difficult to apply to AT seal rings that require strict dimensional accuracy.

Method used

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Experimental program
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Embodiment 1～5

[0044] PPA, elastomer, etc. were charged into the extruder at the compounding ratio shown in Table 1, and mixed under the conditions of temperature 320° C., screw rotation speed 100 rpm, and powder supply rotation speed 65 rpm to obtain pellets. The resulting particles had a diameter of about 3 mm and a length of 3-4 mm. Next, the pellets and fillers in the compounding ratio shown in Table 1 were put into an extruder, and mixed under the conditions of a temperature of 320° C., a screw rotation speed of 50 rpm, and a powder supply rotation speed of 65 rpm to obtain composite resin pellets. The following commercial items were used for PPA, elastomer, and filler.

[0045] The obtained composite pellets were injection molded to produce various measurement samples. In order to measure the surface hardness, a dumbbell test piece (JIS-K71132 test piece) was produced, and in order to measure the impact value and the flexural modulus, a strip test piece (ISO178, 179, 80×10×4 mm) was p...

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Abstract

The objective of the present invention is to provide a seal ring which has excellent dimensional stability and fit with an opposing member, is able to effectively prevent leakage of oil even at very low hydraulic pressure, and has excellent sliding properties. The seal ring is produced from a resin composition containing (A) a polyphthalamide and (B) at least one species selected from among an elastomer, a cross-linked rubber, and a dynamically cross-linked resin. To the resin composition may also be added (C) at least one type of filler material selected from among carbon fibers, glass fibers, alumina fibers, potassium titanate fibers, boron fibers, silicon carbide fibers, carbon nanotubes, montmorillonite, bentonite, talc, isinglass, mica, molybdenum disulfide, glass beads, graphite, fullerene, anthracite powder, aluminum oxide, titanium oxide, magnesium oxide, potassium titanate, boron nitride, and PTFE powder.

Description

technical field [0001] The present invention relates to a seal ring. More specifically, the present invention relates to a seal ring mounted on an automatic transmission (Automatic Transmission, hereinafter referred to as "AT") of an automobile or the like. Background technique [0002] In the AT, the seal ring is installed in two ring grooves provided at separate positions on the outer peripheral surface of the rotary shaft. The outer peripheral surface of the sealing ring is in sliding contact with the inner peripheral surface of the housing that accommodates the clutch pedal and the brake pedal, and the pressure receiving side and the inner peripheral surface of one of the two sealing rings receive pressure from the inner peripheral surface of the two ring grooves. Working oil (Automatic Transmission Fluid, hereinafter referred to as "ATF") supplied by the oil passage seals the side surface of the annular groove and the inner peripheral surface of the housing from the opp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/10C08K3/00C08K7/04C08L21/00C08L77/06C09K3/10F16J15/20
CPCC08K7/04C08L21/00C08L77/06C09K3/10C09K2200/0208C09K2200/0278C09K2200/0607C09K2200/0667Y02P20/141C08K3/00F16J15/10F16J15/20F16J15/3496
Inventor 齐藤美香
Owner RIKEN CO LTD
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