ROTARY PISTON MACHINE WITH INTERNAL SPLINED SHAFT

摘要

The invention relates to a gerotor type rotary piston machine. The casing has a main axis and the gerotor gear set includes an externally toothed star member which is rotatable about its own axis and orbital about the casing main axis. A main drive shaft is rotatable about the casing axis and a universal type wobble shaft connects the main shaft to the gerotor star member. An annularly shaped valve is mounted in said casing for rotation about the casing main axis. The valve is in surrounding relation to the wobble shaft and is axially positioned between the two ends of the wobble shaft. The wobble shaft has a cross bore and a diametrically extending drive member attached to the valve extending through the cross bore. The wobble shaft has a longitudinally extending bore and a keying shaft having a stem in this bore engages the valve drive member in driving relation thereto. The keying member is needed because the wobble shaft has a compound rotating and orbiting motion whereas the valve only has a rotating motion and something more than a simple shaft and bore connection between them is required.