Fluorine-resin sealing ring

A technology made of sealing rings and resins, which is applied to engine sealing, mechanical equipment, and other chemical processes, and can solve problems such as fluororesin fixation, welding, and coating film melting

Inactive Publication Date: 2015-04-08
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the creep resistance of the seal ring made of this material is improved, there is still a possibility that the fluororesin may stick to each other under the condition of generating frictional heat under pressure.
In order to prevent the fixation between fluororesins, it may be considered to treat the surface of fluororesin with a liquid coating agent, but the liquid coating agent generally has poor adhesion to the fluororesin, and the coating itself may melt and weld due to frictional heat. high sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] PTFE (Asahi Glass product G163) 68% by weight, glass fiber (Nitto Industries, Ltd. product CSX-3J-451S) 30% by weight and oil coke (Chuetsu Black Lead Industrial product, average particle size 20 μm) 2% by weight were mixed with a mixer Finally, compression molding was performed at 10 to 20 MPa using a compression molding machine, and then calcined in a calciner at a temperature above the melting point to produce a cube-shaped (4×4×4 mm) test piece.

[0059] The obtained test piece was placed on the lower electrode in a vacuum chamber of a low-pressure plasma processing apparatus, and the vacuum chamber was evacuated to a degree of vacuum of 10 Pa. Argon gas is introduced at the point when the vacuum degree is reached, and while the pressure in the vacuum chamber is maintained at about 60 Pa, a high-frequency power supply with a frequency of 13.56 MHz is used to supply 200 W of power to the upper electrode for 5 minutes, and the argon gas is plasma Bulkization to modify...

Embodiment 2

[0065] In Example 1, two types of sticking resistance evaluations were performed using a test piece in which the plasma-modified PTFE surfaces of the test piece were overlapped and clamped with a jig.

Embodiment 3

[0067] In Example 1, two kinds of anti-sticking evaluations were performed on the test piece subjected to the plasma modification treatment by changing the supply time of high-frequency power to 10 minutes.

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Abstract

A PTFE resin sealing ring in which at least one surface of an abutting part that forms a discontinuity in the sealing ring has been subjected to a plasma-modification treatment using a non-polymerizable gas and a pressure during plasma exposure of 10 to 500 Pa. Since the abutting surface(s) of this PTFE resin sealing ring has / have been subjected to a low-pressure plasma treatment, changing the states of the C-F bonds in the surface region(s), the abutting part does not stick even after a steady load has been applied at a high temperature, producing the prominent effect of ensuring both sealing performance under pressure and the ability to slide when not under pressure. This sealing ring is effective as a sealing material used with rotation or reciprocal motion, including a hydraulic circuit in a continuously variable transmission (CVT) or an automatic transmission (A / T) in an automobile, for example.

Description

technical field [0001] The present invention relates to a fluororesin seal ring, and more particularly to a fluororesin seal ring capable of preventing fusion between fluororesin components. Background technique [0002] Resin seal rings are now used in rotation or reciprocation in hydraulic circuits including, for example, automotive automatic transmissions (A / T), continuously variable transmissions (CVT), and the like. The resin seal ring generally has a joint portion constituting a discontinuity in a part of the ring in order to ensure mountability in the annular groove, sealability under pressure, and slidability under normal pressure, and is set so that A slight gap in the circumferential direction (joint gap) occurs at the joint when the seal ring is installed. When the temperature of the sealing fluid rises, the seal ring thermally expands, and the gap between the joints gradually narrows, resulting in a state where the cut surfaces of the joints butt against each ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/16C08J7/00C08K3/00C08L27/18
CPCF16J15/3284C08K7/06C08J7/00C08K3/00C08L27/18F16J15/16C09K3/1009B29C59/14B29C59/142B29C2059/147C08J7/123C08J2327/18C08K3/04C08K7/14
Inventor 深泽清文古贺晶子铃木昭宽栗山秀树
Owner NOK CORP
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