System for controlling transmission ratio of transmission for au

Details System for controlling transmission ratio of transmission for au System for controlling transmission ratio of transmission for au

1981-05-12

1984-11-06

Leppink, James A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

B60K 4104

Patent

active

044805047

ABSTRACT:
The transmission ratio of an infinitely variable transmission for automotive vehicles is controlled by a system including a hydraulic servo. The servo mechanism including an actuator which is driven by a line pressure to actuate the transmission and a spool having one end to which a signal pressure responsive to both throttle opening responsive pressure and vehicle speed responsive pressure is applied counteractingly against a spring. The spool provides a control valve function for the driving fluid pressure to the actuator. In response to signal pressure change to the spool the actuator is actuated in such direction that the transmission ratio is decreased or increased. The signal pressure is produced by a compensation valve due to a throttle opening responsive pressure and vehicle speed responsive pressure, e.g. governor pressure.

REFERENCES:
patent: 3828618 (1974-08-01), Sharpe et al.
patent: 3913418 (1975-10-01), Miyao et al.
patent: 3949627 (1976-04-01), Murakami
patent: 3958466 (1976-05-01), Epenschied
patent: 4098148 (1978-07-01), Wayman
patent: 4257441 (1981-03-01), Iwanaga et al.
patent: 4347764 (1982-09-01), Lauven

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