Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1983-11-28
1985-12-24
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74866, 474 12, B60K 4112, F16H 1106
Patent
active
045598509
ABSTRACT:
A stepless automatic transmission for a motor vehicle includes a V-belt type stepless transmission mechanism having input and output pulleys mounted respectively on input and output shafts, each pulley being provided with a hydraulic servo for varying the effective diameter thereof, and a V-belt linking the input and output pulleys to transmit power therebetween, in combination with a forward/reverse change-over mechanism and a coupler such as a fluid coupling, centrifugal clutch or friction clutch, and a hydraulic control system. The hydraulic control system includes a primary regulator valve for generating a primary line pressure by regulating pressurized oil from a pressure source responsive to one or more operating conditions of a vehicle such as vehicle speed and/or throttle opening and a secondary regulator valve for generating a secondary line pressure at a lower level than said primary line pressure by regulating pressurized oil from a pressure source responsive to one or more operating conditions of the vehicle. The V-belt type stepless transmission is characterized by input and output pulley hydraulic servos with substantially equal effective pressure receiving areas. The hydraulic control system is arranged to control the hydraulic servo of the input pulley by either supplying primary line pressure or by bleeding pressure therefrom and includes a shift sequence mechanism adapted to supply the secondary line pressure to the hydraulic servo of the output pulley when the hydraulic servo of the input pulley is supplied with fluid pressure higher than a preset value in normal and upshift operations of the vehicle, and to supply the primary line pressure to the hydraulic servo of the output pulley when the hydraulic servo of the input pulley is supplied with oil pressure lower than a preset value in downshifting the vehicle.
REFERENCES:
patent: 4458318 (1984-07-01), Smit et al.
patent: 4459878 (1984-07-01), Frank
patent: 4459879 (1984-07-01), Miki et al.
patent: 4475416 (1984-10-01), Underwood
patent: 4522086 (1985-06-01), Haley
Aisin-Warner Ltd.
Braun Leslie A.
Rolnicki Joseph M.
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