Hydraulic machine

A hydraulic machine, in particular a hydraulic motor, comprising:

• a body (1);
• a piston (9) able to slide in a reciprocating movement in a cylindrical housing (7) of the body, a chamber (C1, C2) being formed on each side of the piston;
• hydraulic switching means (G) for feeding and evacuating the respective chambers (C1, C2), these switching means being able to adopt two stable positions;
• control means (H) for an abrupt change in the position of the switching means, comprising elastic means;
• and triggering means (13, 15) able, at the end of the stroke of the piston (9), to bring about the change in position of the switching means (G), characterized in that:
• the piston (9) is a simple, non-differential piston, having a closed cross section;
• and the switching means (G) are arranged in the body (1) of the machine, radially on the outside of the cylindrical housing (7) in which the piston (9) slides.