Hydraulic system for braking truck engines
OwnerJohn D. Hale, Frank L. Hale +1inventors
InventorsJohn D. Hale, Frank L. Hale, Samuel J. Hale, Jr.
Life of this patent
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Abstract
An energy absorbing system operable in conjunction with a pump powered off of the vehicle drive train, the system including a driver control panel including a settable relief valve permitting control of remote pilot operated relief valves for variable loading of the pump for vehicle braking purposes. Pump discharge is by-passed around the driver control relief valve during open throttle conditions while conversely a closed throttle position, during deceleration, will automatically close the by-pass to subject pump output to variable loading by the operator controlled relief valve. Additionally, manually operated control valves assure system operation in the event of component failure.
Claims5
An energy absorbing system for a vehicle drive train of the type having a power take-off pump associated therewith, said system comprising,
- a control panel for said system located at the driver's station, said control panel including a driver settable relief valve in fluid communication with said pump, a system pressure indicator,
- a relief valve by-pass line,
- a solenoid actuated valve in the relief valve by-pass line operable in a closed position to divert pump output through said relief valve,
- switch means in circuit with said solenoid valve and operable to close said solenoid valve during vehicle deceleration, and
- pilot operated relief valve means in communication with the power take-off pump, said relief valve means having its pilot in fluid communication with said pump and also with the driver controlled relief valve whereby upon closure of the by-pass line by said solenoid during vehicle deceleration the build up of fluid pressure acting on the pilot may be regulated by adjustment of the driver operated relief valve which in turn regulates the opening and closing of the pilot operated relief valve means to affect loading of the power take-off pump for energy absorbing purposes.
Dependencies are inferred from the claim text.