Hydraulically controlled cone disc continuously-variable transmission
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United States of America Patent
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Jun 7, 2011
Grant Date -
Jan 31, 2008
app pub date -
Jul 25, 2007
filing date -
Jul 29, 2006
priority date (Note) -
Expired
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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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