Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-02-04
1988-11-29
Bonck, Rodney H.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4104
Patent
active
047872721
ABSTRACT:
In a hydraulic control system for a vehicle transmission including a first throttle valve for producing a first throttle pressure for boosting a line pressure valve and a second throttle valve for producing a second throttle pressure for shifting speed stages of the transmission, the spools of the first and the second throttle valve are boosted by the first and the second throttle pressure supplied thereto, respectively, so as to reduce the force required for the driver to bias the two spools in parallel by stepping down on the accelerator pedal; the first and the second throttle valve are further supplied with the first and the second throttle pressure, respectively, in the feedback manner so as to attenuate the increase of the first and the second throttle pressure produced thereby; and a cut-back valve is provided to allow the supply of the first throttle pressure to the first throttle valve for the line pressure boosting and for the feedback control only when the vehicle is running at above normal speed.
REFERENCES:
patent: 4488457 (1984-12-01), Nishimura et al.
patent: 4625591 (1986-12-01), Nishikawa
patent: 4660693 (1987-04-01), Taga et al.
patent: 4691594 (1987-09-01), Taga et al.
patent: 4719822 (1988-01-01), Morisawa
Morisawa Kunio
Taga Yutaka
Bonck Rodney H.
Toyota Jidosha & Kabushiki Kaisha
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