Oil pressure control system for an automatic transmission system

Details Oil pressure control system for an automatic transmission system Oil pressure control system for an automatic transmission system

1975-10-07

1978-01-03

Coan, James F.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

B60K 4118

Patent

active

040659852

ABSTRACT:
An oil pressure control system for an automatic transmission system which includes a fluid torque converter, a transmission gear and friction engaging means adapted to be selectively supplied with line pressure for establishing a selected transmission engagement in said transmission gear, wherein speed shift valves which change over the supply of said line pressure to said friction engaging means are selectively supplied with a detent pressure generated by properly reducing said line pressure. The detent pressure acts to forcibly shift said speed shift valves toward a shift position for establishing a lower speed range in a manner that a speed shift point is biased to a higher speed range by an amount determined by the level of said detent pressure.

REFERENCES:
patent: 3091980 (1963-06-01), Black
patent: 3710652 (1973-01-01), Miyazaki
patent: 3724292 (1973-04-01), Borman
patent: 3831465 (1974-08-01), Murakami
patent: 3951011 (1976-04-01), Lemon

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