Brakes – Operators – Spring
Patent
1976-10-19
1977-05-17
Reger, Duane A.
Brakes
Operators
Spring
92 65, 188 723, F16D 6524
Patent
active
040236544
ABSTRACT:
A brake with improved torque modulation, including first and second relatively rotatable elements, a plurality of brake discs carried by one of the elements to be rotatable therewith and axially movable thereon, a plurality of reaction plates carried by the other of the elements to be rotatable therewith and axially movable thereon, the discs and the plates being interleaved in alternating fashion to define a pack, an axially movable primary piston adapted for engagement with the pack, springs carried by the second element for biasing the primary piston towards the pack, an expandable chamber in the second element including the primary piston, the chamber being arranged so that when fluid under pressure is directed thereto, the piston will buck the springs, an axially movable secondary piston forming part of the chamber and in bucking relation to the primary piston, the primary piston having a larger surface area facing the interior of the chamber than the secondary piston, a stop for limiting movement of the secondary piston relative to the primary piston, and a projection on the secondary piston for applying a force to less than all of the discs and plates in the pack, the force acting in concert with that provided by the springs. The construction improves the ability to control the brake in the working range of brake torques.
REFERENCES:
patent: 3680666 (1972-08-01), Sommer
patent: 3927737 (1975-12-01), Prillinger et a.
patent: 3974896 (1976-08-01), Rach
Caterpillar Tractor Co.
Reger Duane A.
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