I want to know what these 4 transmissions are please describe them briefly. 1. single reduction direct drive2. variable ratio drive belt3. direct drive transmission
The transmission for an internal combustion engine is designed to multiply torque. Because the engine has low torque (the twisting force which provides work) at low engine speeds (rpm - revolutions per minute) we need to have the engine turning more rpms than the drive gear (this makes the vehicle move) to initiate motion. The transmission may have many distinct gear ratios (lowest to highest) to multiply torque incrementally. This is practical because vehicles on the road are constantly changing vehicle speed. To answer #3 first. A direct drive means that the transmission does not change gear ratios at all or is at the highest possible gear. Typically this means that the engine rpms and the drive shaft(s) are turning at or near the same speed. #1. Single reduction means that the drive shaft speed is reduced compared to engine speed by one gear ratio. #2. Variable ratio drive belt means that instead of having a series of discreet gear ratios, this mechanism has an infinitely variable number of ratios between lowest and highest gears. The belt is a mechanical device riding between the two main components of the variable transmission.
