Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1973-09-04
1976-02-17
Scott, Samuel
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
60DIG2, 417 1B, 417326, 74856, 74869, 74752A, B60K 4118, F16H 374, F04B 4900
Patent
active
039384098
ABSTRACT:
An hydraulic control circuit for an automotive vehicle automatic transmission includes an oil pump driven by a motor and shift valves for applying hydraulic pressures to hydraulic servos for engaging or disengaging clutches and for applying or releasing brake bands causing upshift or downshift of the transmission. The oil pump motor drive control circuit is provided with a detector for detecting traveling velocity of the vehicle, a detector for detecting the load of the vehicle engine, a range signal generator for generating a signal representative of a selected range position, a shift signal generator adapted to determine, in response to a signal from the range signal generator, a shift point and for generating a shift signal, a motor drive circuit adapted to vary the rotational speed of the motor for driving the oil pump in two stages, and a motor drive control circuit adapted to control said motor drive circuit so as to cause said motor to drive at a high speed for a time interval required for completely engaging the clutches and applying the brake bands when the upshift, downshift or shift from N or P range occur.
REFERENCES:
patent: 2977765 (1961-04-01), Fillmore
patent: 3633439 (1972-01-01), Annis
patent: 3646835 (1972-03-01), Ito et al.
patent: 3650161 (1972-03-01), Ito et al.
patent: 3673892 (1972-07-01), Kato et al.
patent: 3701294 (1972-10-01), Ito et al.
patent: 3750495 (1973-08-01), Ito et al.
patent: 3776048 (1973-12-01), Enomoto et al.
Chandler Lance W.
Scott Samuel
Toyota Jidosha Kogyo Kabushiki Kaisha
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