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A car engine has a limited range of revolutions that it can achieve. In normal operation this is from around 800 revolutions per minute to 7,000 revolutions per minute. Any higher than this and the engine would suffer damage. So one reason for using a gearbox is to allow the engine to continue transferring power to the wheels over all speeds.
Secondly consider this:
If the engine were set to make the car move at 70 MPH then the amount of torque required to make the car move from a standstill would be greater than the amount of power the car could produce to move the car forward. Moving from a standing start would stall the engine. So its true to say that the gearbox sacrifices speed for torque.
To do this, the gearbox changes the ratio of the engine speed and the wheels. Starting in a low gear the engine spins more revolutions to get one spin of the wheels. In a high gear the ratio of the engine revs to the wheel revs in closer to or above unity.
Cars can have fitted either a manually selected gear box, a semiautomatic or fully automatic gearbox. In a manual select car the ratio is selected via a gear stick and the selections is by the driver. In a semi-select car the clutch is automatic but the gear selection is manual. In a fully automatic the clutch and the gearbox selection is either by a mechanical system or in the case of newer cars via a small computer.
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Why is a gearbox fitted to a car?
HGJH
What are three shafts in a gearbox fitted to a front engine rear wheel drive vehicle?
Could be a PTO (Power Take Off) to operate accessories like a dump body or a snow plow.
Does a vehicle engine have a constant speed?
No, that is why there is a gearbox
Can a 1.6 saxo engine fit a 1.1 106 gearbox?
Yes, the VTR does, not sure if all years do, but my 2001 1.1 gearbox fitted onto my 2003 VTR :)
What does it mean when gearbox fault light comes on?
when gearbox fault light comes on, it means there is a problem with the gearbox. you need to take vehicle to a mechanic
How do you fit a saxo gearbox?
assuming the old ones aready out,get the car in the air,lift the new gearbox in and wiggle it into place,then do up all the bell housing bolts.gearbox fitted!
Will the f23 gearbox fit a x20xev engine?
Yes, the F23 fits perfectly with the x20xev fitted into my Astra G.
When can crossply tires be fitted at the rear of a vehicle?
crossplys are only fitted on the rear on a dual system.
Which vehicle model is fitted with ISBe engine?
LPT3118
What is a function of the clutch in the vehicle?
The purpose of a clutch on a vehicle is to disconnect the drive of the engine from the gearbox (this would be required when the vehicle is stationary or to change gear). While the engine is running the crankshaft is continually turning, It is the crankshaft that turns the gearbox and via the gearbox the road wheels. Obviously there are times when the engine is running but drive is not required, The clutch is the mechanism by which this is achieved.
Which device allows a driver to change gears when driving a stickshift vehicle?
gearbox
What is Mark 4 vw golf vehicle speed sensor?
it is a device that is inline of the speedo to give the speed of the vehicle its normally on the gearbox.
