Tutorial: Physics Topic: Gearboxes Prepared by : RNDr. Ondřej Jeřábek Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Meaning of gearbox: Multiplication of torque Change of revolutions of driven shaft To choose suitably gearbox ratio Direction change of revolutions or way Usage of gearbox: Lathes, cars
Driving shaft– It is driven by engine Driven shaft– It is driven by driving shaft Driving shaft gear Driven shaft gear
Driving shaft – Driven by engine - Gears are firmly fixed - Gears rotate only with shaft Driven shaft – Driven by driving shaft - Gears are free-fitted - Shaft and wheels can turn (rotate) individually
Engine torque is multiplied by ratio i=D2/D1 i - ratio D 1 – Driving shaft diameter D 2 – Driven shaft diameter i<1 Step-up gear i>1 Reduction gear M V = i. M M V – Final torque M- Engine torque
Manual gearbox– driver chooses ratio with gearshift Sequential gearbox– driver chooses ratio by pressing the button Automatic gearbox– gear shifting begins independently of driver´s will Variable speed gearbox – continuous ratio change
rotary ► rotary input energy is rotary – output energy is rotary rotary ► linear input energy is rotary - output energy is linear linear ► linear input energy is linear – output energy is linear