Mumbai University > MECH > Sem 5 > Theory Of Machines 2

Marks: 5 M

Year: May 2015

• Any automobile engine can produce rotation only within a certain range.
• Usually this range is too high for tyres. As tyres have very large diameter as compared to engine shafts, they will have more than required speed, if engaged directly.
• This will lead to accidents and no control of automobile.
• Reducing the speed will reduce the power as P = Tw.
• Hence, to take advantage of the range of RPM of the engine, a gear box is used.
• The gear box can give different linear speeds of vehicles for the same RPM of the engine.