Hydraulic Machine Including an Improved Braking System

A hydraulic machine comprising:

• a casing rotatably mounted relative to a shaft;
• a cylinder block provided with a plurality of pistons arranged in an internal volume of the casing;
• first brake means constrained to rotate with the casing;
• second brake means constrained to rotate with the shaft, and adapted to co-operate with the first brake means;
• a braking piston adapted to act on the first brake means or the second brake means, said braking piston being associated with return means tending to exert a force on the braking piston tending to act on the first and/or second brake means so as to put them into contact;
• and
• a brake-release chamber adapted to be connected to a pressure force so as to apply a brake-release pressure selectively to the braking piston, thereby tending to oppose the force applied by the return means on the braking piston, so as to enable the first and second brake means to be separated;
• said hydraulic machine comprising a sweeping channel arranged in the shaft so as to define a leakage flow between the brake-release chamber and an internal volume of the casing containing the cylinder block.