Caterpillar Tractor Co.

Neil W Kroth

Kenneth R Lohbauer

James E Scheidt

In a vehicle including front and rear wheels having brakes associated therewith, a single master cylinder actuates a first brake valve operatively associated with the front wheels of the vehicle, and also a second brake valve operatively associated with the rear wheels of the vehicle.

Brake system

A fluid brake system for a vehicle includes a pair of separate brake valves, each normally held in a non-braking position by pressure applied thereto through an additional valve. The additional valve may be moved to a position wherein such pressure is released from the brake valves, whereupon the brake valves move to braking positions.

Fluid brake system for a vehicle

A fluid control circuit for regulating fluid flow between a pressurized fluid source and a hydraulic motor, including a control valve having a movable spool for communicating fluid entering an inlet chamber from the source with service chambers in communication with the motor, a dump valve limiting communication of the inlet chamber with a drain in response to spring means and fluid communicated to the dump valve through a passage open to either of the service chambers when it is placed in communication with the inlet chamber by the control valve spool, the passage otherwise communicating the dump valve with a drain so that fluid communication between the inlet chamber and drain is limited only by the spring means. The force of the spring means may also be varied in certain embodiments of the invention. During operation of a second hydraulic motor by an additional control valve in communication with the inlet chamber, the dump valve is conditioned to provide pressure modulation in the inlet chamber by means of a bypass valve responsive to the additional control valve.

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Joliet, IL, United States of America

Neil W Kroth