Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-09-23
1990-01-16
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4118
Patent
active
048935271
ABSTRACT:
A speed change control apparatus for an automatic transmission having a plurality of friction elements in which a gear stage is established by engaging one of the friction elements and disengaging one of the others. The speed change control apparatus includes control valves connected to respective ones of the friction elements, a duty solenoid valve connected to each oil line supplying a respective one of the control valves with control hydraulic pressure, and control means for engaging one friction element by outputting an engagement duty signal to one duty solenoid valve to control the control hydraulic pressure, and disengaging one of the other friction elements correspondingly by outputting disengagement duty signals to one of the other duty solenoid valves to control the control hydraulic pressure.
REFERENCES:
patent: 3956947 (1976-05-01), Leising et al.
patent: 4513639 (1985-04-01), Hiramatsu
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4671139 (1987-06-01), Downs et al.
patent: 4680988 (1987-07-01), Mori
patent: 4706522 (1987-11-01), Nitz
patent: 4753135 (1988-06-01), Sotoyama et al.
Furusawa Choji
Hattori Katsuhiko
Ishiguro Toshiaki
Shimei Masato
Yamaguchi Hiroyuki
Aisin Seiki Kabushiki Kaisha
Kabushiki Kaisha Toyota Chuo Kenkyusho
Wright Dirk
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