A power train substantially contains an internal combustion engine and an adjacent gearbox unit is connected to the vehicle body via a power-plant mounting. At least one of the base and the rotary support part includes a cavity forming a space around a rotation axis. The first process chamber 2 fourth process chamber 8 are each arranged between one of the lock areas 6 or 7 and the central transport chamber 5 in series. When the first inclined surface is rotated relative to the second inclined surface through the first rotational structure, a first angle is formed between the first body and the second body, and the first inclined surface is completely corresponding to the second inclined surface.