Patent ID: 7832996

Claim:
A hydrostatic, low-speed rotary cylinder engine, comprising: a power part which acts as an output and comprises a central, stationary stator having a first inner tooth system with the number d of teeth, a rotary piston having a first outer tooth system partly engaging the first inner tooth system and having a number c of teeth and a second inner tooth system having a number b of teeth and a centrally mounted shaft having a second outer tooth system partly engaging the second inner tooth system and having a number a of teeth, the rotary piston, for executing an orbital movement, being arranged eccentrically and dimensioned so that tooth chambers which are supplied with working fluid and from which said fluid is discharged form between the first inner tooth system and the first outer tooth system, an inlet and outlet part for supplying working fluid to and discharging said fluid from the power part, a disk-like rotary valve for controlling the supply of the working fluid and discharge of the working fluid from the tooth chambers, an axial compensating piston for sealing to prevent leakage at the rotary valve, a toothed gear between an outer shaft tooth system of the shaft and a stationary inner toothed ring as synchronous drives of the rotary valve and two roller bearings arranged directly adjacent on the shaft on both sides of the power part, wherein the rotary valve is mounted so as to run concentrically with the shaft and with the stator, the toothed gear is arranged exclusively in a leakage oil region of the rotary cylinder engine and the toothed gear is in the form of a planetary gear having at least one planet carrier which is non-rotatably connected to the rotary valve and on which planet wheels are arranged between the outer shaft tooth system and the stationary inner toothed ring.