Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1980-11-10
1982-11-09
Butler, Douglas C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 724, 188170, F16D 5540
Patent
active
043580009
ABSTRACT:
An improved brake for a wheel mounted on a spindle is of the type which includes a housing secured to the spindle with a plurality of brake discs carried by the housing for relative rotation therewith. A plurality of reaction plates are carried by the hub of the wheel for relative rotation therewith and the discs and plates are intervened in an alternating fashion to define a pack. A first piston is axially, slidably mounted in a bore with the housing to define a first expandable chamber therebetween. Hydraulic fluid is selectively introduced to and discharged from the first chamber to produce selective movement of the first piston axially relative to the bore to cause it to produce a compressive force on the pack. The improvement includes adding a parking brake feature by providing a different backing plate portion to the housing. An annular cavity in the improved backing plate slidably receives a second piston therein. The second piston is biased to cause an axial extension thereof to contact the first piston to produce a compressive force on the pack. The introduction of hydraulic fluid to a second chamber between the second piston and the cavity will axially move the second piston away from the pack, overcoming the biasing and preventing it from applying the compressive force to the pack.
REFERENCES:
patent: 3770085 (1973-11-01), Cottingham
patent: 3895695 (1975-07-01), Hunter
patent: 3946837 (1976-03-01), Houser
Butler Douglas C.
Diefendorf R. R.
Rockwell International Corporation
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