Pilot pump bleed control for earthmoving scrapers

Details Pilot pump bleed control for earthmoving scrapers Pilot pump bleed control for earthmoving scrapers

1974-06-26

1976-02-03

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Independent control of bypass between opposed working chambers

60403, 91437, 91461, F15B 1108, F15B 13042

Patent

active

039357929

ABSTRACT:
In an earthmoving scraper a low volume, low pressure, pilot pump supplies fluid pressure to a pilot control valve which routes this fluid through bleed lines to a remote scraper control valve that operates the bowl jacks on the scraper from a separate source of pressurized hydraulic fluid. By manually varying the bleed rates of the output of the pilot pump with the spool of the pilot valve, proportion actuation of the control valve can be obtained through differential pressures in the bleed lines connecting it to the pilot valve. A safety valve connected in the bowl carry circuit supplies an alternate source of fluid pressure to the pilot valve if the pilot pump fails, ensuring positive fail-safe operation of the system.

REFERENCES:
patent: 3160174 (1964-12-01), Schmiel et al.
patent: 3366016 (1968-01-01), Anderson
patent: 3515032 (1970-06-01), Dezelan et al.
patent: 3620129 (1971-11-01), Fruehauf

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