Patent ID: 8206130

Claim:
A radial cylinder hydraulic motor, comprising: oscillating hydraulic cylinders driven to oscillate by an eccentric crankpin formed on the motor shaft, oscillating cylinder liners being provided with trunnions for oscillation about a parallel axis to the axis of rotation of the motor shaft, which are coupled oscillably to the motor crankcase; reciprocating pistons within said liners, which are provided with a runner for sliding over the outer surface of said eccentric crankpin; and a rotary disk distributor coupled to the motor shaft for synchronized rotation therewith, adapted to place the conduits of the hydraulic circuit in fluid communication with the conduits of the respective cylinders during the delivery and discharge strokes via ports of slanted or through-going configuration, wherein the rotating disk of the distributor includes a supply path in communication with a passageway between a face of the rotating disk and the inner wall of the distributor cover incorporating a seal, with pressurized fluid in the area outside the seal, and wherein said supply path comprises: a depression extending parallel to the passageway; and a hole which connects one of the slanted configuration ports to the depression.