The transmission drive gear-also known as the driving gear-is the component within a gear pair responsible for driving the mating gear. It transmits power via the drive shaft and works in conjunction with a driven gear within a mechanical transmission system to achieve changes in rotational speed and torque; such gears are widely used in applications ranging from automotive transmissions to wind turbine gearboxes.
Power transmission is achieved through the meshing of gear teeth, with the gear ratio determined by the interaction between the drive gear's tooth count and rotational speed and those of the driven gear. In assemblies such as final drives, critical design parameters include the number of teeth, offset direction, and pressure angle. Gear design must satisfy requirements for transmission performance, strength, and durability, involving processes such as tooth profile selection, material heat treatment, and precision machining.
