Abstract: A piston compressor contains at least one cylinder (2), inside of which a reciprocating piston (4) forms two working chambers (10, 12) disposed on opposing sides of the piston, which each have at least one inlet and one outlet opening, in which a respective inlet valve (20, 22) or an outlet valve (24, 26) operates. A housing (32) surrounds the cylinder, and has a suction port (34) and an exhaust port (36). A space between the cylinder and the housing is divided by a separating wall (28, 30) in such a way as to connect the suction port with the inlet openings and the exhaust port with the outlet openings. A driving arrangement (42, 44) reciprocally moves the piston. The inlet valve of one working chamber opens and the inlet valve of the other working chamber closes for each stroke of the piston, and the outlet valve of the one working chamber closes, while the outlet valve of the other working chamber opens.

Abstract: A piston compressor contains at least one cylinder (2), inside of which a reciprocating piston (4) forms two working chambers (10, 12) disposed on opposing sides of the piston, which each have at least one inlet and one outlet opening, in which a respective inlet valve (20, 22) or an outlet valve (24, 26) operates. A housing (32) surrounds the cylinder, and has a suction port (34) and an exhaust port (36). A space between the cylinder and the housing is divided by a separating wall (28, 30) in such a way as to connect the suction port with the inlet openings and the exhaust port with the outlet openings. A driving arrangement (42, 44) reciprocally moves the piston. The inlet valve of one working chamber opens and the inlet valve of the other working chamber closes for each stroke of the piston, and the outlet valve of the one working chamber closes, while the outlet valve of the other working chamber opens.

Abstract: In an internal combustion engine there is provided a cylinder head; a plurality of cylinder head bolts for securing the cylinder head to a cylinder block; at least one engine cylinder; at least two intake valves and two exhaust valves controlling the flow of gases into and from the engine cylinder. A plane defined by the intake valves and a plane defined by the exhaust valves extend at an angle of between 0.degree. and 15.degree. to one another and have an inclined orientation to the longitudinal engine axis. An overhead camshaft extends parallel to the engine axis and is situated in a zone bounded by the cylinder head bolts. Respective valve bridges interconnect the intake valves with one another and the exhaust valves with one another, and rocker arms connect respective cams of the camshaft with the valve bridges, whereby the intake valves are simultaneously operated by one cam and the exhaust valves are simultaneously operated by another cam.

Abstract: To adjust the stroke of a control element actuated electromagnetically by means of a spring-mass oscillating system for displacement engines and to enable a freer arrangement of the electromagnetic setting device in the housing, in particular in a cylinder head of a displacement engine, the movement of the setting device is transferred to the control element, in particular one or more lift valves or flat slide valves, by means of a mechanical or hydraulic transmission system whose transformation ratio varies. Furthermore, devices are provided to adjust with precision the equilibrium position of the oscillating system. The electromagnetic setting device can also be combined with an end position attenuator and with a hydraulic compensating element.