Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1990-08-08
1991-10-01
Diehl, Dwight
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4112
Patent
active
050522477
ABSTRACT:
An apparatus for controlling a vehicle continuously variable transmission, including a directional control valve having a first spool movable between a shift-down and a shift-up position, a flow control valve including a second spool movable between a flow-restricting and a non-restricting position, and a first and a second solenoid-operated valve for applying an actuating pressure to the first and second spools. The directional and flow control valves and the solenoid-operated valves are adapted such that the first and second spools are moved toward the shift-up and flow restricting positions, respectively, when the actuating pressure is not applied to the spools, or when solenoid coils of the two solenoid-operated valves are both off. The directional control valve may have a shift-down chamber for receiving a pilot pressure to move the first spool to the shift-down position when a failure of one of the solenoid coils exists while the vehicle speed is lower than a predetermined limit.
REFERENCES:
patent: 4565110 (1986-01-01), Itoh
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4734082 (1988-03-01), Tezuka
patent: 4747807 (1988-05-01), Nakamura et al.
patent: 4752277 (1988-06-01), Morimoto
patent: 4753627 (1988-06-01), Kawamoto
patent: 4867732 (1989-09-01), Soga et al.
Abe Tetsuya
Habuchi Ryoji
Itoh Hiroshi
Kato Nobuyuki
Kouno Katsumi
Diehl Dwight
Toyota Jidosha & Kabushiki Kaisha
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