초록 ▼

An all-hydraulic brake release system is disclosed for use on a vehicle having a transmission fluid pressure source, a brake fluid pressure source and a spring-applied, fluid pressure-released vehicle brake. The system has a control valve block which is hydraulically connected to the transmission fl

An all-hydraulic brake release system is disclosed for use on a vehicle having a transmission fluid pressure source, a brake fluid pressure source and a spring-applied, fluid pressure-released vehicle brake. The system has a control valve block which is hydraulically connected to the transmission fluid pressure source, the brake fluid pressure source and the brake. A first, transmission clutch pressure-responsive valve in the block controls the fluid connection between the brake fluid pressure source and the vehicle brake. A second, brake fluid pressure-responsive valve in the block controls the communication of brake fluid pressure to a pilot end of the first valve. If either brake fluid pressure or transmission clutch pressure falls below respective predetermined values, the first valve closes to cut off the supply of brake fluid pressure to the brake such that the brake is applied to stop vehicle movement.

대표청구항 ▼

An all-hydraulic brake release system for a vehicle having a transmission fluid pressure source, a brake fluid pressure source and a spring-applied, fluid pressure-released vehicle braking means, the system comprising: conduit means connecting the transmission fluid pressure source with the braking

An all-hydraulic brake release system for a vehicle having a transmission fluid pressure source, a brake fluid pressure source and a spring-applied, fluid pressure-released vehicle braking means, the system comprising: conduit means connecting the transmission fluid pressure source with the braking means; and valve means in the conduit means for controlling communication between the transmission fluid pressure source and the braking means, wherein the valve means includes manually operable means movable between open and closed positions for opening and closing the conduit means to communication between the transmission fluid pressure source and braking means and wherein the valve means includes means responsive to transmission fluid pressure to (1) maintain the manually operable means in a selected open position when transmission fluid pressure is above a predetermined minimum pressure and (2) return the manually operable means from a selected open position to a closed position when the transmission fluid pressure is below the predetermined minimum pressure.