Hydraulic system for an automatic transmission of an automotive

Details Hydraulic system for an automatic transmission of an automotive Hydraulic system for an automatic transmission of an automotive

1976-08-18

1978-06-13

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4118

Patent

active

040942112

ABSTRACT:
An automotive vehicle has an automatic transmission to which fluid is supplied from a source through a control valve having a body which is displaceable to control the flow of the fluid to the load constituted by this tranmission. A plurality of binarily stepped pilot faces are provided on one side of the valve body and the other side is connectable to the source of fluid pressure. A plurality of pressurizable chambers at each of the surfaces are each connected via a respective line to a respective solenoid valve itself connected to the high-pressure side of this system. Binary actuation of these pilot surfaces via the solenoid valves in accordance with motor speed allows the transmission very smoothly to be upshifted and downshifted.

REFERENCES:
patent: 3724295 (1973-04-01), Wakamatsu et al.
patent: 3726157 (1973-04-01), Marumo
patent: 3732755 (1973-05-01), Beig et al.
patent: 3937108 (1976-02-01), Will

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