Integral piston and adjuster for a brake

F - Mech Eng,Light,Heat,Weapons – 16 – D

Patent

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F16D 65/54 (2006.01) F16D 55/40 (2006.01)

Patent

CA 1110184

INTEGRAL PISTON & ADJUSTER FOR A BRAKE ABSTRACT OF THE DISCLOSURE An actuator mechanism for a brake having a plurality of friction disc compressed between a pressure plate and a backing plate. The actuator mechanism has a piston located in a bore of a housing. A pin fixed to the housing extends through and locates the piston in the bore. A first tube located in the bore between the piston and the pressure plate transmits an operational input to the pressure plate upon closure of an air gap established by a spring caged on the first tube by a retainer. A second movable tube connected to the pin engages the retainer member and holds the first tube away from the pressure plate to maintain the air gap between the first tube and the pressure plate. The air gap forms a barrier to reduce the transfer of thermal energy between the plurality of friction disc and the actuator mechanism. The piston, in response to an operational input, initially moves in the bore by overcoming the spring and brings the first tube into engagement with the pressure plate to eliminate the air gap. At the same time, the piston engages the retainer member to establish a solid linkage between the piston and the second tube. Further movement of the piston deforms the second tube and moves the second tube with respect to the pin. Upon termination of the operational input, the second tube remains stationary and the spring moves the first tube to reestablish an air sap of substantially the same initial dimension after every brake application.

322277

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