Oil pressure control means for an automatic transmission

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

1978-03-15

1980-02-05

Husar, C. J.

Machine element or mechanism

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

Preselected indexed position

B60K 4118

Patent

active

041866274

ABSTRACT:
An oil pressure control means for an automatic transmission for vehicles having a plurality of speed shift valves for changing over supply of oil pressure to a plurality of friction engaging means for establishing various speed stages, a manual shift valve for shifting speed ranges and adapted to selectively supply control pressure to the speed shift valves, and a downshift control valve for controlling supply of the downshift control pressure to a particular speed shift valve so that a downshift operation performed by the manual shift valve does not cause abrupt two stage downshifting from the highest speed stage to the next but one lower speed stage, skipping the next lower speed stage.

REFERENCES:
patent: 3167970 (1965-02-01), Wagner et al.
patent: 3400613 (1968-09-01), Johnson et al.
patent: 3638771 (1972-02-01), Chana
patent: 3656373 (1972-04-01), Shimosaki
patent: 3731558 (1973-05-01), Enomoto
patent: 3768338 (1973-10-01), Bahorich
patent: 4050332 (1977-09-01), Taga

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