Brakes – Wheel – Transversely movable
Patent
1994-10-28
1996-06-11
Graham, Matthew C.
Brakes
Wheel
Transversely movable
188332, F16D 6509, F16D 5100
Patent
active
055247350
ABSTRACT:
A brake actuator assembly is disclosed for expanding internal shoe brakes in which a pair of brake shoes (17) are disposed within a brake drum (11). A pair of cam members (33,35) are fixed to a pair of cam shafts (41,43) and are operable to engage the brake shoes by use of cam followers (37,39), in response to a brake input (56,55). The cam shafts (41,43) are timed relative to each other by a pair of gears (73,75). The disclosed actuator assembly ensures that the cam members rotate through the same angular magnitude, but the amount of torque transmitted to each cam is determined by the braking force required for the respective brake shoe. The disclosed actuator assembly provides for substantially greater lift, for longer shoe wear life, without taking up as much space in the radial direction as would an equivalent S-cam arrangement.
REFERENCES:
patent: 1802545 (1931-04-01), Acker
patent: 1810194 (1931-06-01), Weaver
patent: 1976420 (1934-10-01), Taylor
patent: 1985671 (1934-12-01), Taylor
patent: 2024963 (1935-12-01), Boughton
patent: 2087371 (1937-07-01), Chambers
patent: 3439779 (1969-04-01), Saver
patent: 3770879 (1973-11-01), Watson
patent: 4811821 (1989-03-01), Wrench
patent: 4981200 (1991-01-01), Gee
Eaton Corporation
Gordon Howard D.
Graham Matthew C.
Kasper L. J.
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