Caterpillar Tractor Co.

Curtis Farris Cummins

Kenneth W Kelly

Harold N Lantz

A parking brake assembly for applying braking force to a vehicular differential by means of an adjunctive pinion. The parking brake is pressure released and spring engaged to selectively lock the differential. An auxiliary steering pump is also associated with the differential by means of the adjunctive pinion such that the steering pump is driven by the adjunctive pinion. The parking brake assembly includes a plurality of friction discs and plates which are forcibly brought into and out of engagement for selectively applying or releasing the brake.

Differential coupled parking brake and steering pump assembly

A vehicle with at least front and rear sets of brakes includes a pair of brake control valves for normally communicating a source of pressurized fluid to individually control the brakes, a counterpart pair of inversion valves for normally supplying air piloting pressure to the brake control valves, and a retarding valve system communicating a source of pressurized air at one value to one inversion valve and at a proportionately lower pressure to the other inversion valve so that one set of brakes absorbs less energy than the other set of brakes in a retarding mode. The brake control system also includes a service brake valve actuatable to delivery equal pressure to both inversion valves for absorbing equal energy in both sets of brakes in an overriding manner with respect to the retarding valve system.

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Decatur, IL, United States of America

Curtis Farris Cummins