Continuously variable ratio transmission unit

There is disclosed a continuously variable ratio transmission unit of rolling traction type, comprising a pair of races ( 10,12 ) between which torque is transmitted by at least one roller ( 26 ), the roller being movable to provide variation in the transmission ratio and being subject to an adjusta...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	WOODS ADRIAN, DEFREITAS ANDREW D
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	There is disclosed a continuously variable ratio transmission unit of rolling traction type, comprising a pair of races ( 10,12 ) between which torque is transmitted by at least one roller ( 26 ), the roller being movable to provide variation in the transmission ratio and being subject to an adjustable roller reaction force by a roller actuator ( 28 ), a traction loading actuator ( 35 ) arranged to urge the rollers and discs into engagement with each other with a force which is varied in sympathy with the roller reaction force during normal variator operation, and a pre-loading arrangement ( 80 ) which is arranged to urge the rollers and discs into engagement with each other at least during a cold start wherein the pre-loading arrangement is adapted to apply a pre-loading force is reduced with increasing operating temperature.