Hydrogenated nitrile rubber composition and drivetrain oil seal

• US 10,442,919 B2
• Filed: 12/08/2015
• Issued: 10/15/2019
• Est. Priority Date: 12/18/2014
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Kobayashi, Atsushi
• Primary Examiner(s): Mulcahy, Peter D.
• Application Number:
  US15/536,972
• Publication Number:
  US 20170355838A1
• Time in Patent Office: 1,407 Days
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 15/00 Compositions of rubber derivatives C08L11/00, C08L13/00 take precedence
• CPC Class Codes: C08L 15/005 Hydrogenated nitrile rubber
• CPC Class Codes: C08L 9/02 Copolymers with acrylonitrile
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34
• CPC Class Codes: F16J 15/20 Packing materials therefor
• CPC Class Codes: F16J 15/3236 with at least one lip for each surface, e.g. U-cup packings

Abstract

A hydrogenated nitrile rubber composition and a drivetrain oil seal whereby seal squeal can be prevented even upon wearing away of the sealing or even under dry lubrication conditions without any grease. The hydrogenated nitrile rubber composition comprises 100 parts by weight of hydrogenated nitrile rubber and further 10 to 55 parts by weight of wollastonite and 10 to 55 parts by weight of graphite as fillers, the total amount of the fillers being 50 to 110 parts by weight. The drivetrain oil seal comprises a crosslinked product of the hydrogenated nitrile rubber composition.

Claims

1. A drivetrain oil seal having a side lip with an edge face that serves as a sliding sealing face, comprising a cross-linked product of a hydrogenated nitrile rubber composition which comprises 100 parts by weight of hydrogenated nitrile rubber, and further 10 to 55 parts by weight of wollastonite and 10 to 55 parts by weight of graphite as fillers, the total amount of the fillers being 50 to 110 parts by weight.

2. The drivetrain oil seal according to claim 1, wherein the hydrogenated nitrile rubber composition further comprises carbon black.