Brake piston assembly

Details Brake piston assembly Brake piston assembly

1988-06-14

1991-04-23

Olszewski, Robert P.

Brakes

Wheel

Axially movable brake element or housing therefor

188264CC, 188 724, F16D 6584

Patent

active

050092910

ABSTRACT:
An actuator is described for a disc brake system of the type which includes a piston whose front end is pressed against a disc by pressured hydraulic fluid that is applied to the rear of the piston and that is prevented from leaking by an elastomeric seal extending around the middle of the piston, which minimizes heating of the seal and hydraulic fluid. The piston is hollow, and has internal walls near its forward end forming a sealed chamber containing sodium. The piston has fins on its outside around the sodium-containing container. A hollow space between the rear wall of the piston and the sodium-filled chamber contains a vacuum. Applicant finds that the temperature rise of the seal and hydraulic fluid is greatly reduced by these arrangements.

REFERENCES:
patent: 2254074 (1941-08-01), Klave
patent: 2889897 (1959-06-01), Sanford et al.
patent: 4513844 (1985-04-01), Hoffman, Jr.
patent: 4605104 (1986-08-01), Thompson

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