Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-08-17
1979-03-13
Geoghegan, Edgar W.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74869, B60K 4104
Patent
active
041435630
ABSTRACT:
A hydraulic control system for use in an automatic transmission including a fluid coupling type torque converter, and a gear system provided with two or more frictional engaging devices adapted to establish two or more speed conditions. The hydraulic system further includes a hydraulic pressure source, a line pressure control valve for supplying a regulated line pressure, by receiving a hydraulic pressure from the hydraulic pressure source, a throttle pressure control valve for generating a throttle pressure commensurate with an intake throttle opening, a governor pressure control valve for generating a governor pressure commensurate with vehicle speed, a manual change-over valve for enabling manual change-over of the transmission, two or more shift valves for shifting the path of the line pressure to be supplied to the frictional engaging devices in response to abalancing of the relationship between the throttle pressure and the governor pressure, the shift valves including one shift valve operative to establish the highest speed ratio for the transmission, and a highest speed control device for controlling to a low-speed-side shift position the one shift valve of the aforementioned shift valves which is operative to establish the highest speed ratio irrespective of the governor pressure resulting when the intake throttle opening remains over a given valve.
REFERENCES:
patent: 3651714 (1972-03-01), Ohya et al.
patent: 3908486 (1975-09-01), Mitamura et al.
patent: 3978743 (1976-09-01), Murakami
patent: 4008630 (1977-02-01), Murakami et al.
Ito Hiroshi
Shindo Yoshio
Geoghegan Edgar W.
Toyota Jidosha Kogyo Kabushiki Kaisha
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