Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-08-23
1979-03-27
Geoghegan, Edgar W.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74869, B60K 2100
Patent
active
041459377
ABSTRACT:
A hydraulic control system for a vehicle automatic transmission includes: a first frictional engaging device operable for shifting to a low speed drive; a first hydraulic servo for the first frictional engaging device, a second frictional engaging device operable for shifting to a high speed drive; a second hydraulic servo for the second frictional engaging device; a throttle pressure control valve for delivering a throttle pressure associated with an opening of an intake throttle valve and the speed of the vehicle having the automatic transmission; and a shift valve for changing over a fluid path from the first hydraulic servo to the second hydraulic servo upon upshift of the transmission in response to the throttle pressure and a governor pressure of the system, and from the second hydraulic servo to the first hydraulic servo upon downshift of the transmission. This valve includes a valve element displaceable between a first position and a second position, and when the valve element is displaced a given distance from the first position towards the second position, a hydraulic pressure for the second hydraulic servo may be applied to the element, whereupon the governor-pressure-acting area of the valve element is increased, so that the valve element is displaced according to a snap action. Likewise, the valve element is displaced from the second position towards the first position according to a snap action, after being displaced a given distance.
REFERENCES:
patent: 3656373 (1972-04-01), Shimosaki
patent: 3785614 (1974-01-01), Enomoto
patent: 3881372 (1975-05-01), Miyauchi et al.
Ito Hiroshi
Shindo Yoshio
Geoghegan Edgar W.
Toyota Jidosha Kogyo Kabushiki Kaisha
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