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TRANSMISSION SYSTEM

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SLIDING MESH GEAR BOX

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CONTENT

• INTRODUCTION • SLIDING MESH GEAR BOX• FUNCTION OF A GEAR BOX• POWER FLOW PATH IN GEAR

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INTRODUCTION

A gearbox is a collection of mechanical components that deliver maximum power from an engine by managing a series of gear ratios that in turn operate a transmission.

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Function Of A Gear Box

• Torque ratio between the engine and wheels to be varied for rapid acceleration and for climbing gradients.

• It provides means of reversal of vehicle motion.

• Transmission can be disconnected from engine by neutral position of gear box

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Sliding Mesh Gear Box

• Normally 3 forward and 1 reverse gear ratios• Spur gears are used• Gear wheels on the main shaft engage with

gear wheels on the lay shaft (counter shaft) by sliding themselves.

• Not used in automobiles now

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POWER FLOW PATH IN GEAR ENGAGEMENT

•When engine is running and the clutch is engaged, clutch shaft gear drives the drive gear of the lay shaft and thus lay shaft also rotates. •But the main shaft remains stationary as no gears in main shaft are engaged with lay shaft gears.

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•Low speed•High acceleration

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•Slightly less acceleration •Bit more speed

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• Even less acceleration•Even high speed

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•By operating gearshift lever, the larger gear of main shaft is meshed with reverse idler gear. •The reverse idler gear is always on the mesh with counter shaft reverse gear. Interposing the idler gear.

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