Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1980-11-25
1983-09-27
Dorner, Kenneth
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, 74878, 74867, B60K 4110, B60K 4106
Patent
active
044061811
ABSTRACT:
An automatic transmission includes a gear transmission mechanism with several friction engaging mechanisms. Selective supply of actuating pressure to these mechanisms selectively provides different speed stages from the transmission, including a directly connected speed stage and an overdrive speed stage. A driver operated manual selector valve can be set to several forward ranges including a "D" range, and produces a lower range pressure when any forward range except for "D" range is selected thereon. A kickdown pressure is produced when the accelerator pedal of the vehicle is depressed beyond a predetermined amount. An electrically operated pressure control device produces a holddown pressure signal according to operating conditions of the vehicle. A direct/overdrive shift valve controls supply of pressure to the friction mechanisms, so as to engage the overdrive speed stage, or the directly coupled speed stage, according to a balance relationship between a throttle pressure and a governor pressure, and, when override pressure is supplied to an override port of this direct/overdrive shift valve, it is prevented from providing the overdrive speed stage. A downshift pressure selector valve supplies pressure to the override port when and only when there is present at least one of the lower range pressure, the kickdown pressure, and the holddown pressure signal.
REFERENCES:
patent: 3685372 (1972-08-01), Miyazaki
patent: 3710652 (1973-01-01), Miyazaki
patent: 3774629 (1973-11-01), Enomoto
patent: 3783713 (1974-01-01), Will
patent: 3785224 (1974-01-01), Will
patent: 3895542 (1975-07-01), Miyauchi
patent: 4052930 (1977-10-01), Hiramatsu
patent: 4148232 (1979-04-01), Moriya
patent: 4252148 (1981-02-01), Fochtman
Kubo Seitoku
Kuramochi Koujiro
Kyushima Tatsuo
Dorner Kenneth
Toyota Jidosha Kogyo Kabushiki Kaisha
Wright D.
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