what is the need of gears in the cars and motor bikes?

Answer 1

To get the most out of the engine.
The engine rotation is transfered to the wheels, and there is only so much force in it, and only so much spin. So the gears are used to reduce the number of turns from the engine to the wheels, therefore increasing the force. That is how you start. then as the vehicle accelerates and there is more inertia, the engine gets to its max spin while the force required to move is less. that's when you change the gear, increasing the turns from the engine to the wheel, at expense of the force, (at this point in time, less force is required to maintain the vehicle moving. )

Automatic transmisions do the same, but without you changing gears.

Answer 2

Gears transfer power from the engine to the wheels, they also convert power, low gear for going slow and high gear for goinng fast. so thats y gears is very important part in cars n motor bikes

Answer 3

The engine "sees" a load due to many factors - weight of the car/bike or the road surface(friction) , gradient of the road etc..

And "Torque" is the attribute that describes this load the best.

When driving the engine needs to deliver varying levels of torque. e.g more torque is required when climbing up hill (or braking torque when going down hill). The Power of the engine being limited, it can deliver varying torques at different RPM (rev per minute) . I.e Torque x Angluar velocity = Power.

The gears help you derieve the best by multplying torque , therby reducing the size of the engine..

Hope this helped :-)

Answer 4

Gears transfer power from the engine to the wheels, they also convert power, to fit the individual needs of the vehicle at any given time, low gear for going slow and high gear for goinng fast. I hope that helps you

Answer 5

to assist the engine in doing work. Something like a mechanical advantage that you get when you use a long spanner Vs doing it with your fingers. At rest, you and your vehicle require a lot of work from the engine to get you moving (inertia). As you pick up some speed, and gather momentum, your engine needs to do less work. and hence you can keep moving to a higher gear.

Answer 6

If there were no gears then the vehicle wheels will turn at the same rpm as the engine of the vehicle. And your vehicle will use more fuel for the fixed ratio of the engine and the wheel rotation.

Answer 7

in drive gear box the gears are assembled in order to get the speed ratio. the gear box in turn transmits the drive from the engine. gear meshes with another gear in gear box as per design of gearbox gives torque

Answer 8

Torque Multiplication

Answer 9

to get more speed