Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1980-08-15
1983-08-02
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4116, F16H 564
Patent
active
043959261
ABSTRACT:
A hydraulic control system for an automatic transmission including a fluid coupling type torque converter, and a gear system provided with two or more frictional devices adapted to establish two or more speed conditions. The hydraulic control system includes a hydraulic pressure source, a line pressure control valve receiving pressure from the hydraulic pressure source to generate a regulated line pressure, a throttle pressure control valve for generating a throttle pressure commensurate with the intake throttle opening, a governor pressure control valve for generating a governor pressure commensurate with the vehicle speed, a detent regulator valve receiving the line pressure to generate a regulated detent pressure, a manual valve for enabling manual shifts of the transmission, two or more shift valves for shifting the paths of the line pressure to the frictional engaging devices in response to the opposingly acting forces of the throttle pressure and governor pressure, the shift valves including one shift valve operative to establish the highest speed ratio for the transmission, and a control valve provided in the shift valve for the highest speed ratio and adapted to draw in the detent pressure when the intake throttle valve is opened substantially to a full extent, in a manner to offset the throttle pressure acting on the highest shift valve, thereby controlling the highest shift valve according to a balancing relation between the detent pressure and the governor pressure.
REFERENCES:
patent: 4143563 (1979-03-01), Shindo et al.
patent: 4186627 (1980-02-01), Kuramochi
Asami Ken
Kubo Seitoku
Nakamura Shinya
Terakura Yukio
Aisin Warner Kabushiki Kaisha
Herrmann Allan D.
Toyota Jidosha Kogyo Kabushiki Kaisha
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