Drive aggregate for a heat pump

Claim 1

In a drive aggregate for a heat pump, including a cylinder block defining cavities for forming at least one cylinder of an internal combustion engine and at least one cylinder of a compressor driven by the engine; a common crankshaft passing through said cylinder block for serving both the engine and the compressor; and a plurality of bearings mounted in said cylinder block and supporting said crankshaft; the improvement wherein said cavities all have the same height dimension; further comprising a valve carrier plate sealingly secured in each cavity which forms a compressor cylinder; a compressor valve supported by said valve carrier plate; said valve carrier plate defining an end of the compressor cylinder formed by the respective cavity; a cylinder head secured to said cylinder block and extending over all said cylinders; each compressor cylinder having a top end oriented towards said cylinder heads; said valve plate being spaced from said cylinder head and from the top end of the respective compressor cylinder and being situated in its entirety within a respective said compressor cylinder; engine valves associated solely with each said engine cylinder and being mounted in said cylinder head; said cylinder head having a plurality of predetermined locations adapted to accommodate valve guide passages in the zone of each cylinder; means defining throughgoing valve guide passages solely in the predetermined locations associated with the engine cylinders for accommodating and guiding parts of said engine valves, whereby said predetermined locations of said cylinder head in the zone of each compressor cylinder being void of throughgoing valve guide passages for sealing said cylinder head in the zone of each said compressor cylinder.