Wet friction materials including cristobalite as filler material

Patent metadata

Field	Value
Publication number	US-9771994-B2
Application number	US-201514934207-A
Country	US
Kind code	B2
Filing date	Nov 6, 2015
Priority date	Nov 6, 2015
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A friction material for a clutch comprising a plurality of fibers and a filler material including crystalline silica. The crystalline silica is cristobalite in an example aspect. A friction material for a clutch comprising: a plurality of fibers; and, a filler composition including: an amorphous silica-containing material; and, a plurality of crystalline silica particles, said particles having a Mohs hardness at least 6 and characterized by a rounded morphology. A friction material for a clutch comprising: a plurality of fibers; a filler composition including: diatomaceous earth; and, cristobalite including a plurality of particles characterized by a median particle size in a range from about 0.5 μm to about 5 μm; and, a resin; and, the friction material includes cristobalite in a range of from about 2% to about 20% by weight based on total weight of the friction material and has a static friction coefficient of at least 0.115.

First claim

What we claim is:

1. A friction material for a clutch comprising:
a plurality of fibers;
a filler composition including:
diatomaceous earth; and,
cristobalite including a plurality of particles characterized by a median particle size in a range from about 0.5 μm to about 5 μm; and,

a resin; and,
the friction material includes cristobalite in a range of from about 2% to about 20% by weight based on total weight of the friction material and a static friction coefficient of at least 0.115.

Assignees

• Schaeffler Technologies Ag

Inventors

• Bakan Murat
• Farahati Rashid

Classifications

• F16D69/028 Primary

  containing fibres · CPC title

• F16D69/026 Primary

  containing fibres · CPC title

• F16D2200/0069

  being characterised by their size · CPC title

• C09K3/14

  Anti-slip materials; Abrasives {(products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling B24B31/14, B24C1/00; polishing compositions containing abrasive or grinding agents C09G1/02; friction compositions for brakes or clutches F16D69/02; polishing of semi-conductors H10P52/40)} · CPC title