Patent ID: 6913555
Filing Date: 2005-07-05
Classification: F16H

Abstract:
1. A CVT transmission for a motor vehicle comprising equipment for continuous variation of motion in terms of torque and of speed delivered, said continuous variation being obtained between two shafts; said equipment for continuous variation of motion comprising first mechanical means with fixed transmission ratio, and second mechanical means for transmitting power with variable transmission ratio, there being set between said first mechanical means and said second mechanical means an epicyclic gear train including a central gear fitted on a driven one of said shafts, whilst said first mechanical means drive a spider carrying a plurality of planetary gears, said planetary gears including teeth meshed with internal teeth of a crown gear, a speed of said crown gear being an algebraic sum of the speeds of a gear wheel fitted on said driven one of said shafts and of said first mechanical means driving said spider; said CVT transmission being characterised in that input of motion from an engine connected in rotatably driving relation thereto occurs about an axis substantially parallel to an axis of longitudinal symmetry of the motor vehicle, whilst axes of said shafts, respectively, are set transverse to said axis of longitudinal symmetry of the motor vehicle; the transmission being connectable in driving relation to a differential having an axis of longitudinal symmetry transverse to said axis of longitudinal symmetry of the motor vehicle and substantially parallel to the axes of said shafts, wherein at least one pair of gear wheels, fixed to said crown gear, is meshed with a pair of gear wheels of the differential rotatable about the axis of longitudinal symmetry of said differential, in which a transmission ratio between said transmission and said differential can be selected by means of a sliding toothed shaft coupling and by means of a servo control.