Importance

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Abstract

A piston machine has two pistons which reciprocate in two cylinders. The cylinders define working chambers in which a working medium can either be compressed by the pistons or can exert pressure on the pistons. The pistons are connected to a crankshaft via two connecting rods which are pivotally connected to the same crank pin. The interior of the crankcase forms a third working chamber. The crankshaft is formed as a rotary slide valve which, in operation, connects the first working chamber to the third working chamber and the second working chamber to a working medium supply or discharge opening. The piston machine can be used either as an engine (such as an expansion motor driven by compressed gas) or as a working machine (such as a machine which produces compressed gas). In another embodiment, the rotary slide valve has a rotor which is formed by the crankcase and a stator which is a ring housing. In another embodiment, the crankshaft is eccentrically secured so that a crescent-shaped intermediate space is formed between the stator and rotor, and the head portions of the cylinder liners have working faces which are alternately subjected to working medium pressure in the crescent-shaped intermediate space.

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First Claim