Sealing rubber composition and seal member

• US 10,377,932 B2
• Filed: 07/29/2016
• Issued: 08/13/2019
• Est. Priority Date: 08/18/2015
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation), Koyo Sealing Techno Co., Ltd. (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: Kawabayashi, Takeshi, Kasahara, Fumiaki, Kusunoki, Katsuhiko
• Primary Examiner(s): Foster, Nicholas L
• Application Number:
  US15/223,749
• Publication Number:
  US 20170051123A1
• Time in Patent Office: 1,110 Days
• CPC Class Codes: C08K 2201/005 Additives being defined by their particle size in general
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 5/5435 containing oxygen in a ring
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C09K 3/1006 characterised by the chemical nature of one of its constituents
• CPC Class Codes: F16J 15/324 Arrangements for lubrication or cooling of the sealing itself
• CPC Class Codes: F16J 15/3284 characterised by their structure; Selection of materials

Abstract

A sealing rubber composition includes acrylic rubber, artificial graphite, and coupling agent.

Claims

1. A sealing rubber composition for forming a sliding surface of a seal member for sliding against another member, comprising:

100 parts by mass of a carboxylated acrylic rubber;

5 to 40 parts by mass of an artificial graphite formed by firing a coke and graphitizing the coke at a temperature of 2500°

C. or higher, the artificial graphite being in the form of particles having an average overall particle size of 5 μ

m to 50 μ

m; and

0.5 to 5 parts by mass of an epoxy silane coupling agent for aiding in bonding the acrylic rubber to the artificial graphite particles,

wherein the artificial graphite particles form friction reducing protrusions for protruding from the sliding surface of the seal member and for contacting the another member.

2. A seal member comprising:

a sliding surface for sliding against another member, wherein at least the sliding surface is formed of the sealing rubber composition according to claim 1, and

wherein the friction reducing protrusions of the artificial graphite particles protrude from the sliding surface and are for contacting the another member.