Basically the gear attached directly to the motor of the driving gear or the driver gear a.k.a the input gear. The driver gear is coupled to the driven gear or the output gear. read more
In gear system there are two gears one is driven gear and other is driving gear.driving gear is connected to driving shaft which is connected to prime mover .Which transmitted power to driving shaft to driving gear then to driven gear through meshing action. read more
The "driving" or drive gear is the source of power or rotation. The driven gear is turned or moved by the drive gear. Example: The pulley on a motor is the drive pulley and a pulley on a pump is the driven pulley. Example: The pinion gear in a differential is the drive gear and the ring is the driven gear. read more