Abstract: An internal combustion engine has a crankcase (2) and a fuel injection system (21) supplied with compressed air, whose piston compressor (12) has a piston (15) guided in a cylinder (18) and a driving crankshaft in operating connection with the engine crankshaft (6). To produce favorable construction conditions, the crankcase (2) constitutes the cylinder (18) for the piston (15) of the piston compressor (12).

Abstract: In a two-stroke cycle internal combustion engine, cylinder structure has an inside peripheral surface which defines a cylinder bore and is formed with an exhaust port, which has an axial extent along the axis of said cylinder bore and communicates with said exhaust system. A piston is axially reciprocable in said cylinder bore and adapted to open and close said port. A restricting member is mounted in said cylinder structure adjacent to said port and adjustable between a full-flow position, in which said restricting member exposes said exhaust port throughout its axial extent, and a restricting position, in which said restricting member restricts the axial extent of said exhaust port. A positioning drive is operatively connected to said restricting member and operable to adjust said restricting member between said full-flow and restricting positions. The positioning drive is adapted to be controlled in dependence on the exhaust gas pressure in said exhaust gas system.

Abstract: A tracklaying vehicle has an engine, a drive shaft, and right and left drive wheels. It is steered by an arrangement having right and left planetary-gear transmissions each provided with a sun gear connected to the respective wheel, a ring gear coaxially surrounding the respective sun gear and connected directly to the drive shaft, at least one planet gear meshing with the respective sun and ring gears, and a planet carrier carrying the respective planet gear. The ring gears are joined together and connected to the drive shaft. Respective independently operable right and left hydrostatic drive motors are connected to the planet carriers of the respective transmissions and can be independently operated for adding of their rotation to or subtracting it from that of the respective output.