Compact Radial Piston Hydraulic Machine Having a Cylinder Block with Deforming Regions

A hydraulic machine comprising:

• a cylinder body with a first port, a second port and a curved side surface, and including a plurality of cylinder bores disposed radially in the cylinder block with openings through the side surface and passages connecting the plurality of cylinder bores to the first and second ports, the cylinder body having a plurality of deformation regions each comprising a rim projecting outwardly from the side surface and around one of the openings, wherein the deformation regions repeatedly deform in response to pressure changes in the cylinder bores;
• a closing band extending around the cylinder body and closing the openings of the plurality of cylinder bores, wherein the closing band applies compressive force to the cylinder body through the rim of each deformation region;
• a plurality of piston assemblies each slideably received in a different one of the plurality of cylinder bores;
• and
• a drive shaft rotatably received in the cylinder block and having an eccentric cam for driving the plurality of piston assemblies within the plurality of cylinder bores.