Abstract: A switchover valve unit (36) for an internal combustion engine that has an adjustable compression ratio for controlling an hydraulic oil stream in hydraulic chambers (22, 23) of an eccentric adjustment device. The hydraulic chambers (22, 23) can be filled with hydraulic oil via hydraulic oil feed lines (24, 25), and ventilation of the hydraulic chambers (23, 24) via hydraulic oil discharge lines (30, 31) is permitted or not permitted depending on a switching position of the switchover valve unit (36). The switchover valve unit (36) having an actuating module (53) with a linearly displaceable pick-off element (37), a valve module (56) with ventilation valves (41, 42) in the hydraulic oil discharge lines (30, 31), and actuating rods (39, 40) that can be displaced linearly by the pick-off element (37). The ventilation valves (41, 42) are opened or closed depending on the switching position of the pick-off element (37).

Abstract: A drive train (1) of a purely electrically all-wheel drivable motor vehicle, has a first axle (2), a second axle and two electric machines (10) arranged in the direction of travel (3) of the motor vehicle. The first axle (2) can be driven by the electric machines (10) via a transmission (11). The transmission (11) and the first axle (2) are connected to each other by at least one bevel gear toothing (20, 7; 20, 27), and the transmission (11) and a shaft for driving the second axle are connected to each other by at least a further toothing (22, 23; 22, 28). In this way, an all-wheel drive can be achieved with a simple construction by the use of such a drive train in a motor vehicle that is to be operated in a purely electrical manner.