Inching valve

Details Inching valve Inching valve

1977-08-03

1979-04-24

Scott, Samuel

192 clutches and power-stop control

Clutch and brake

Vehicle type

13762561, 192109F, B60K 4124, F16D 6702

Patent

active

041507371

ABSTRACT:
In a control apparatus, for a vehicle having a transmission and brake means wherein hydraulic passage means connects a source of fluid pressure to a fluid actuated clutch, an improved inching valve interposed in said passage means for selectively reducing the hydraulic pressure supplied to the clutch in proportion to the degree of actuation of the brake means in two successive stages wherein there is no direct initial mechanical connection between the inching valve spool and its actuating means whereby in the first stage of operation the solely hydraulical connection between the actuating means and the spool member positively restricts the operation of the improved inching valve to pressures below the maximum desired clutch slip pressure and wherein during the second stage of operation, the clutch pressure is further reduced to a minimum slip pressure.

REFERENCES:
patent: 3143127 (1964-09-01), Frost
patent: 3339672 (1967-10-01), Crandall
patent: 3365035 (1968-01-01), Kress
patent: 3568718 (1971-03-01), Wilke et al.
patent: 3696897 (1972-10-01), Kitano et al.
patent: 3990549 (1976-11-01), Sisson et al.
patent: 4006805 (1977-02-01), Zeller et al.

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