Transmissions are used in a vehicle’s drive train. The engine speed is converted to the drive speed. This is necessary in motor vehicles to ensure that the relatively small usable speed range of a combustion engine is made available to the velocity ranges. Transmissions can have either manual or automatic operation.

Automatic transmissions also include twin-clutch transmissions.

Precision, dynamics and cost-effectiveness set this transmission apart from conventional automatic transmissions.

Solenoids and valves for twin-clutch transmissions.

In combination with on-off valves, proportional pressure control valves ensure a smooth gear change with an imperceptible interruption of traction in these transmissions. Additional on-off and pilot valves ensure optimal pressure and thermal management in twin-clutch transmissions.

Transmissions in commercial motor vehicles also include transfer cases. This transmission is fitted after the basic transmission. It can be used in vehicles which have several powered axles. These are known as all-wheel drive vehicles. The transmission distributes the propulsive power to several axles, using one output per axle. The individual axles can be activated and deactivated, depending on type.

The torque flow on a four-wheel drive between high and low to the front and rear axle is regulated by a gear shaft, which is controlled by an on-off solenoid.