INTRODUCTION

CONTINUOUSLY VARIABLE TRANSMISSIONPRESENTED BY-

VISHNUBHAI PRAJAPATI (140280711018) ME 2nd SEM IC ENGINE AND AUTOMOBILE

LD COLLEGE OF ENGENEERINGTOPICS DISCUSSEDINTRODUCTIONEVOLVEMENT OF CVTSketched by Leonardo da Vinci in 1490 Old idea that has only recently become a bastion of hope to automakersAdvancements in fuel economy and emissions triggered the R&D of CVT.If consumers are buying millions of cars with conventional transmissions, why spend billions to develop and manufacture CVTs?

TYPESTOROIDALDeveloped by NissanApplicable for engines capacity more than 3.0litresTransmissions use high shear strength of viscous fluids to transmit torque between i/p torus & o/p torus.By changing the tilt of the power rollers continuously, the EXTROID CVT executes smooth, continuous gear ratio changes.Power rollers controlled by hydraulic pressure.

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BELT DRIVE/PUSH BELT CVTUses segmented steel blocks stacked on a steel ribbon.Transmits power by means of two pulleys and a steel belt 1 pulley receives torque generated from engine and other pulley transmits drive torques to tires.Gear ratio is varied by varying the width of pulleys.Limited to small engines of capacity < 2litres..Electronically controlled by sensors.

VARIABLE DIAMETER CVTUses a flat, flexible belt mounted on movable supports.Supports can change radius and thus gear ratio

Cone CVTWorks with belt sliding over two elongated cones setup parallel.Aligned such that largest dia. Of one cone aligned against smallest dia of other cone

Driver

BENEFITS

LIMITATIONSR&D OTHER APPLICATIONSoperate in a wide range of speeds, as the need arises

QUESTIONS