college work

[dave watson]

state 3 diffrent functions of a gearbox

[MK999]

How many ways can you word transmitting power? lol

[dave watson]

haha thats why i put it up on here

[General Baxter]

changing gears :p

[Rickardo]

A transmission or gearbox provides speed (http://en.wikipedia.org/wiki/Speed) and torque (http://en.wikipedia.org/wiki/Torque) conversions from a rotating power source to another device using gear ratios (http://en.wikipedia.org/wiki/Gear_ratio). The most common use is in motor vehicles (http://en.wikipedia.org/wiki/Motor_vehicle), where the transmission adapts the output of the internal combustion engine (http://en.wikipedia.org/wiki/Internal_combustion_engine) to the drive wheels. Such engines need to operate at a relatively high rotational speed (http://en.wikipedia.org/wiki/Rotational_speed), which is inappropriate for starting, stopping, and slower travel. The transmission reduces the higher engine speed to the slower wheel speed, increasing torque (http://en.wikipedia.org/wiki/Torque) in the process. Transmissions are also used on pedal bicycles, fixed machines, and anywhere else rotational speed and torque needs to be adapted.
Often, a transmission will have multiple gear ratios (or simply "gears"), with the ability to switch between them as speed varies. This switching may be done manually (by the operator), or automatically. Directional (forward and reverse) control may also be provided. Single-ratio transmissions also exist, which simply change the speed and torque (and sometimes direction) of motor output.
In motor vehicle applications, the transmission will generally be connected to the crankshaft (http://en.wikipedia.org/wiki/Crankshaft) of the engine. The output of the transmission is transmitted via driveshaft (http://en.wikipedia.org/wiki/Driveshaft) to one or more differentials (http://en.wikipedia.org/wiki/Differential_%28mechanical_device%29), which in turn drive the wheels. While a differential may also provide gear reduction, its primary purpose is to change the direction of rotation.
Conventional gear/belt transmissions are not the only mechanism for speed/torque adaptation. Alternative mechanisms include torque converters (http://en.wikipedia.org/wiki/Torque_converter) and power transformation (e.g., diesel-electric transmission (http://en.wikipedia.org/wiki/Diesel-electric_transmission), hydraulic drive system (http://en.wikipedia.org/wiki/Hydraulic_drive_system), etc.). Hybrid configurations also exist.

[General Baxter]

dont copy that lol

[dave watson]

i have used my brain and done it myself but can any one work out gearbox ratios

[MK999]

only way I can think of, of splitting it into 3 is a bit dubious but, transmitting power, through a variety of ratios, while supporting the weight of the engine. But the last may not always be true, and the 2nd is by definition really, other wise it's not a gearbox, it's just a direct drive transmission, the 1st is the only real job of a gearbox

[Rickardo]

http://www.howstuffworks.com/gears.htm

Have a look, it explains everything.

[dave watson]

sorted now mate

[mowgli]

going forwards, going backwards, leaking oil on your drive...