Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1990-05-18
1992-01-14
Oberleitner, Robert J.
Brakes
Wheel
Axially movable brake element or housing therefor
188 7961, 188 7962, 188196P, 188364, F16D 5102
Patent
active
050802020
ABSTRACT:
The invention relates to a wheel cylinder for a drum brake, comprising a body (2) provided with a longitudinal bore, two pistons (4,6) sliding in opposite directions outwards in the bore under the action of a pressurized fluid introduced between the pistons against the return springs of the shoes of the brake, and a mechanism limiting the return travel of the pistons when the pressure is released. According to the invention, the mechanism limiting the travel consists of two resilient rings (16, 18), at the outer periphery of each of which a friction mechanism (20, 22) is disposed, and which are disposed, respectively, in an annular groove (24, 26) made in each of the pistons so as to provide a specific axial clearance (d) between a radial wall of the groove and the adjacent side of an assembly consisting of the resilient ring and the friction mechanism, this assembly being provided in order to resist the return springs of the brake shoes in a drum brake. The resilient rings (16, 18) are in the form of an open retainer ring with variable thickness about its perimeter so as to effect a substantially uniform pressure over its outer periphery against the inner surface of the cylinder.
REFERENCES:
patent: 1755830 (1930-04-01), Loughead
patent: 1896902 (1933-02-01), Kohr
patent: 2417476 (1947-03-01), Finley
patent: 2445061 (1948-07-01), Goeffrich
patent: 2497815 (1950-02-01), Frick
patent: 2723016 (1955-11-01), Goldberg
patent: 3338352 (1967-08-01), Guilhamat
patent: 3467226 (1969-09-01), Belart
Errico Angelantonio
Tristano Nicola
Bendix Altecna S.p.A.
Decker Ken C.
Oberleitner Robert J.
Palguta Larry J.
Poon Peter M.
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