Control apparatus for use in a power transmission system of cons

Details Control apparatus for use in a power transmission system of cons Control apparatus for use in a power transmission system of cons

1986-10-30

1987-11-10

Braun, Leslie

Machine element or mechanism

Gearing

With fluid drive

74866, 3644241, B60K 4118, F16H 4700

Patent

active

047049227

ABSTRACT:
A control apparatus for a power transmission of vehicles such as construction machine having at least one work implement actuated by a hydraulic cylinder unit, a transmission gear with hydraulically operated speed-change clutch, and a torque converter interposed between an engine and the transmission gear so as to transmit rotational power of the engine and having a hydraulically operated stator clutch. The control apparatus has two solenoid actuated clutch pressure control valves respectively provided in two hydraulic circuits which connect a hydraulic fluid supply source with the speed-change clutch and the stator clutch, respectively, so as to change the hydraulic pressure in the hydraulic circuits by the operation of a controller to which respective solenoids of the clutch pressure control valves are connected on its output part and an engine rotation sensor, a pressure sensor for detecting the pressure in the hydraulic cylinder unit of the work implement and a speed-change lever position sensor for detecting the shift of the lever to its first speed position are connected on its input part.

REFERENCES:
patent: 3621955 (1971-11-01), Black et al.
patent: 3805640 (1974-04-01), Schneider et al.
patent: 3951009 (1976-04-01), Andifferd, Jr. et al.
patent: 4004417 (1977-01-01), Woody et al.
patent: 4132132 (1979-01-01), Shaffer
patent: 4271723 (1981-06-01), Shaffer
patent: 4338832 (1982-07-01), Pelligrino
patent: 4373619 (1983-02-01), Schritt et al.
patent: 4485443 (1984-11-01), Knodler et al.

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