Patent ID: 8225707

Claim:
A hydraulic radial piston engine ( 1 ) with a rotary cylinder ( 5 ) that rotates about a rotational axis ( 20 ), the radial piston engine ( 1 ) comprising radially arranged pistons ( 4 ) which are actively connected with a cam disk ( 2 ), and a housing portion ( 13 ) in which a hydraulic distributor ( 10 ) is arranged, the housing portion ( 13 ) being connected in a positionally fixed manner with the cam disk ( 2 ) such that the radial piston engine ( 1 ) is connected to a further housing portion ( 12 ) to produce a structural unit, wherein, when the radial piston engine ( 1 ) is separated from the further housing portion ( 12 ), a spring force biases the rotary cylinder ( 5 ) in a direction along the rotation axis ( 20 ), from a first position to a second position, the rotary cylinder ( 5 ), in the second position, either directly or indirectly engages with the cam disk ( 2 ) so as to prevent further axial movement of the rotary cylinder ( 5 ), and when the rotary cylinder ( 5 ) is in the first position, the rotary cylinder ( 5 ) counteracts the spring force so that the rotary cylinder ( 5 ) moves axially away from engagement with the cam disk ( 2 ), the radial piston engine ( 1 ), when in the first position, is connected to the further housing portion ( 12 ) not supported on the cam disk, and the cam disk ( 2 ) is located adjacent to both the housing portion ( 13 ) and the further housing portion ( 12 ) and spaces and separates the housing portion ( 13 ) from the further housing portion ( 12 ).