Patent ID: 8529233

Claim:
A displacement machine for a compressible medium, comprising: a fixed housing comprised of two housing portions and having at least one spiral-shaped feed chamber, the housing having an inlet leading into a radially outer portion of the spiral-shaped feed chamber and an outlet arranged at a radially inner portion of the spiral-shaped feed chamber, each said housing portion being provided with a bearing receptacle sized to project into the feed chamber; a displacement body associated to the feed chamber and including a carrier disc and helical blades extending out from both sides of the carrier disc; a drive shaft provided with an eccentric disc and rotatably supported in the housing on both sides of the eccentric disc by a first bearing and a second bearing, respectively, which are supported by the bearing receptacles, respectively, said drive shaft sized to extend on a drive side through a wall of the housing and having a drive-side end, said first and second bearings having an axial extent parallel to an axis of rotation of the drive shaft, and being defined in relation to the axial extent by centers which lie in a plane within the feed chamber, said plane being perpendicular to the axis of rotation of the drive shaft; a bearing unit supporting the displacement body on the eccentric disc; first and second counterweights arranged on the drive shaft on both sides of the eccentric disc and respectively disposed immediately adiacent both sides of the eccentric disc and the first and second bearings, respectively; and a drive supported by the drive-side end of the drive shaft.