Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1981-07-28
1984-01-31
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74865, 192 331, B60K 4116
Patent
active
044282591
ABSTRACT:
An automatic transmission includes a gear transmission mechanism with first and second friction mechanisms which are alternatively engaged by alternative supply of first and second actuating pressures thereto when the highest speed stage and the next to highest speed stage are alternatively engaged, and a torque converter including a lockup clutch. A transmission control system includes a pressure control system which controls the gear transmission mechanism by selectively supplying those actuating pressures and possibly others, and a lockup clutch control valve which controls the engagement of the lockup clutch. The lockup clutch control valve is switched to its disengage position when it receives neither a first nor a second control pressure, and is switched to an opposite position by supply of either the first or second control pressure, this opposite position being an engage position for the lockup clutch if governor pressure is over a first specified value. The first control pressure is provided when governor pressure is higher than a second specified value higher than the first specified value and also the first actuating pressure is present; and the second control pressure is provided, if governor pressure is over the first value, when the throttle pressure is lower than a third specified value and also the second actuating pressure is present.
REFERENCES:
patent: 4051932 (1977-10-01), Arai et al.
patent: 4349088 (1982-09-01), Ito et al.
Kubo Seitoku
Kuramochi Koujiro
Kyushima Tatsuo
Braun Leslie A.
Toyota Jidosha & Kabushiki Kaisha
Wright D.
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