(BQ) Part 2 book "Automotive transmissions" has contents: Gearshifting mechanisms, design and configuration of further design elements, electronic transmission control, electronic transmission control, transmission manufacturing technology, reliability and testing of automotive transmissions,. and other contents. | 9 Gearshifting Mechanisms Changing connections Vehicle transmissions require devices to match the ratio, and thus the power available, to the prevailing driving conditions. “Power matching” is one of the four main functions of a vehicle transmission. In manual gearboxes, changing gear is controlled and carried out by the driver. Depending on the amount of automation, in all other gearboxes electronics and actuator systems take over this function partially or completely. Certain transmission functions, such as Neutral, Reverse, and Park are however still controlled by the driver using a shifting device. The gearshifting mechanism thus plays an important role in the interface between driver and vehicle. Its handling has a major influence on perceived comfort. The components used in a gearshifting mechanism depend largely on whether shifting gear involves interrupting the power flow. Other factors are the type of vehicle (passenger car or truck), the type of drive (front-wheel or rear-wheel drive) and the operating conditions. In the following discussion, a distinction is made between • internal shifting elements: shifting elements inside the transmission, such as selector bars, swing forks, synchronizers, multi-plate clutches and • external shifting elements: shifting elements outside the transmission, such as gearshift levers, gearshift gate, linkage, four-bar linkages and cable controls. The concept “shift-by-wire” pertains to the substitution of mechanical gearbox operation with electronic operation (see Section ). Synchronizers are a decisive assembly group in gearboxes that shift with power interruption (MT, AMT) and are also used in dual clutch transmissions (DCT). This important internal shifting element is dealt with thoroughly in Section . Then, in Section , we focus on multi-plate clutches as essential components when shifting without power interruption. The parking lock is an assembly group whose function is to prevent vehicles that have no .
