Schaeffler China

Today, auto shift gearboxes and twin clutch transmissions offer a convenient alternative to conventional solutions. Together, these transmission versions form the XSG family. LuK develops components used for the XSG family, ensuring that space-saving and robust units are available for every type of use in the future.

ASG
With the ASG, a touch of the gearshift lever causes three electric engines to carry out the movements directly on the transmission, which would otherwise be carried out by the driver via the clutch pedal and selector lever. The transmission itself remains unchanged and the construction is compact. LuK ASG allows the transmission to be switched either manually or automatically as desired. The lack of a converter reduces the weight significantly, avoiding sluggish movement and reducing costs. This means that the ASG is also suitable for smaller vehicles.

PSG
The PSG (Parallel Shift) is a double clutch transmission made up of two part-transmissions divided into odd and even gears, as well as a twin clutch. During the gear switch, the torque is continuously transferred from one clutch to the other. The result is excellent shift comfort comparable to an automatic converter. As with the ASG, the fuel consumption is low.

ESG
The LuK ESG is an advantageous hybrid concept based on a transmission with

LuK PSG components. A starter generator is connected to one of the transmission inlet shafts and can take over several functions. Under normal driving conditions, it acts as a replacement for the alternator. Via the transmission, it can start up the engine quicker and more comfortably than a starter. This makes it possible, for example, to switch off the engine at traffic lights, thus saving fuel while keeping the engine warm, while at the same time powering the air-conditioning system directly. The LuK ESG also saves fuel by recycling brake energy. During braking, the engine is disconnected and as much energy as possible is used to charge the battery. This energy can be used for shunting, as well as for enabling a more sporty acceleration by supporting the starter generator of the combustion engine. Overall, the fuel consumption can be reduced by up to 20% compared with manual transmission depending on the design and vehicle.