Hydraulically controlled cone disc continuously-variable...

Details Hydraulically controlled cone disc continuously-variable... Hydraulically controlled cone disc continuously-variable...

2011-06-07

2011-06-07

King, Bradley T (Department: 3657)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

Reexamination Certificate

active

07955202

ABSTRACT:
The invention concerns a continuously variable cone disc transmission with sets of discs mounted on drive and driven shafts. The sets of discs are each hydraulically adjustable axially in their distance from each other whereby the traction train circulating between them is able to adjust to different running circles and thereby enabling a continuously variable transmission. The pressure fluid needed for the hydraulic actuation is supplied to the pressure cylinders by a pump through a control valve. This control valve is actuated hydraulically by a pressure supply that is need-adjusted by a proportional-pressure reduction valve. In the event of a functional failure and consequent loss of the regulating pressure, the control valve is automatically arrested in position, so that the control valve is prevented from giving a command for the sudden change of the transmission ratio into an extreme position.

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Extended European Search Report for corresponding EU patent application; Aug. 23. 2010.

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