Wet disc brake

Details Wet disc brake Wet disc brake

1991-05-02

1992-12-29

Halvosa, George E. A.

Brakes

Elements

Cooling and lubricating

188 715, 188 716, 188170, 192 7012, 192 91R, 192113B, F16D 65853

Patent

active

051744201

ABSTRACT:
A spring applied - hydraulically released (SAHR) type wet disc brake for a wheeled vehicle having a large braking torque and energy absorption capacity. The brake unit includes a piston housing in which an annular piston is mounted for reciprocal movement towards and away from a disc housing defining a disc chamber in which a plurality of interleaved non-rotating and rotating discs are disposed. A pressure plate is mounted for reciprocating movement towards and away from the discs and is operative to apply clamping forces to the discs in order to generate braking torque. A plurality of biasing springs urges the pressure plate towards engagement with the disc pack. Pressurized fluid applied to the piston maintains the pressure plate in a released position. Selective reduction of pressure to the piston effects braking action. A piston-to-reaction plate seal inhibits coolant flow between an inner face of the pressure plate and the adjacent disc. A pressure plate seal carried by a periphery of the pressure plate sealingly engages the disc housing and inhibits coolant flow from the disc chamber, across the pressure plate. A coolant inlet distributes coolant throughout the periphery of the disc chamber. Coolant flows between the discs toward a central region from where it is exhausted through one of the spring chambers. Aligned locations defined by teeth removed from the rotating discs together with a wheel hub member form coolant passages. The pressure plate includes a plurality of standoffs engageable by the piston.

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Excerpt from Power Transmission Design, Sep. 1984 entitled "Slippery Solution to a Hot Problem".
Excerpt from Dura-Disc Wet Disc Brake Brochure.

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