A transmission is a machine in a power transmission framework, which gives controlled use of the power. Regularly the term transmission alludes basically to the gearbox that utilizations apparatuses and outfit trains to give speed and torque transformations from a turning power source to another device.

In British English, the term transmission alludes to the entire drivetrain, including grip, gearbox, prop shaft (for raise wheel drive), differential, and last drive shafts. In American English, notwithstanding, the term alludes all the more particularly to the gearbox alone, and point by point utilization differs

The most widely recognized utilize is in engine vehicles, where the transmission adjusts the yield of the inward ignition motor to the drive wheels. Such motors need to work at a moderately high rotational speed, which is wrong to start, ceasing, and slower travel. The transmission diminishes the higher motor speed to the slower wheel speed, expanding torque all the while. Transmissions are additionally utilized on pedal bikes, settled machines, and where diverse rotational velocities and torques are adjusted.

Regularly, a transmission has numerous apparatus proportions (or just "riggings") with the capacity to switch between them as speed differs. This exchanging might be done physically (by the administrator) or consequently. Directional (forward and invert) control may likewise be given. Single-proportion transmissions likewise exist, which basically change the speed and torque (and once in a while bearing) of engine yield.

In engine vehicles, the transmission by and large is associated with the motor crankshaft by means of a flywheel or grip or liquid coupling, mostly on the grounds that inner burning motors can't keep running underneath a specific speed. The yield of the transmission is transmitted by means of the driveshaft to at least one differentials, which drives the wheels. While a differential may likewise give outfit lessening, its basic role is to allow the wheels at either end of a hub to pivot at various rates (fundamental to maintain a strategic distance from wheel slippage on turns) as it alters the course of revolution.