Hydraulic motor

A hydraulic motor with axial pistons comprising a casing;

• a central shaft rotatably supported by said casing;
• a rotor mounted in a cavity in said casing and keyed onto said shaft;
• a plurality of pistons axially mobile in a sealed manner along respective axial bores provided through said rotor;
• said pistons being arranged to move with this latter with one of their ends in contact with a plate facing an axial end of said rotor and forming an angle with the axis thereof;
• first and second header means facing the other axial end of said rotor to connect said cavity to an inlet and outlet respectively for a pressurized fluid;
• and rotating distribution means disposed in a sealed manner between said header means and the rotor to connect a first and second part of said axial bores to said first and second header means respectively;
• said rotating distribution means comprising a toroidal member cooperating in a sealed manner with said header means, and a plurality of key means each engaging in a sealed manner in a respective one of said axial bores to angularly connect said toroidal member and said rotor together;
• each of said key means being connected to said toroidal member by an articulated joint, duct means being provided through each of said key means and through said toroidal member to connect each of said axial bores to one of said header means, and said articulated joint including an elastically deformable tubular rivet extending in a sealed manner along the respective said duct means and gripping against opposing surfaces of the relative key means and said toroidal member.