Reciprocating differential hydraulic machine, especially a differential hydraulic machine

A hydraulic motor, comprising:

• an envelope;
• a differential piston capable of sliding in a reciprocating movement in the envelope, the piston having two parts of different diameters capable of moving in two corresponding chambers of the envelope;
• hydraulic switching means for supplying and evacuating the respective chambers, these switching means being driven by the piston and able to adopt two stable positions relative to the piston;
• control means for an abrupt change in the position of the switching means relative to the piston, comprising elastic means capable of storing energy, wherein the elastic means comprise a spring coaxial with the lantern ring and surrounding the lantern ring;
• and triggering means capable, at the end of the stroke of the piston, of releasing the energy stored by the elastic means and of causing the abrupt change in position of the switching means, these triggering means comprising thrusting means which, at the end of the piston stroke, come to bear against stops which are fixed relative to the envelope, wherein:
• the switching means are carried by a lantern ring with a side wall coaxial with the piston, driven by this piston but capable of adopting two different stable positions relative to the piston,
• and the elastic means are arranged on the outside of the lantern ring and are guided internally by the side, wall of the lantern ring.

A hydraulic motor, comprising:

• an envelope;
• a differential piston capable of sliding in a reciprocating movement in the envelope, the piston having two parts of different diameters capable of moving in two corresponding chambers of the envelope;
• hydraulic switching means for supplying and evacuating the respective chambers, these switching means being driven by the piston and able to adopt two stable positions relative to the piston;
• control means for an abrupt change in the position of the switching means relative to the piston, comprising elastic means capable of storing energy;
• and triggering means capable, at the end of the stroke of the piston, of releasing the energy stored by the elastic means and of causing the abrupt change in position of the switching mean, these triggering means comprising thrusting means which, at the end of the piston stroke, come to bear against stops which are fixed relative to the envelope, wherein:
• the switching means are carried by a lantern ring with a side wall coaxial with the piston, driven by this piston but capable of adopting two different stable positions relative to the piston,
• the lantern ring is guided in its lower part by a cylindrical region of the differential piston,
• and the elastic means are arranged on the outside of the lantern ring and are guided internally by the side wall of the lantern ring.

A hydraulic motor, comprising:

• an envelope;
• a differential piston capable of sliding in a reciprocating movement in the envelope, the piston having two parts of diet diameters capable of moving in two corresponding chambers of the envelope;
• hydraulic switching means for supplying and evacuating the respective chambers, these switching means being driven by the piston and able to adopt two stable positions relative to the piston;
• control means for an abrupt change in the position of the switching means relative to the piston, comprising elastic moans capable of storing energy;
• and triggering means capable, at the end of the stroke of the piston, of releasing the energy stored by the elastic means and of causing the abrupt change in position of the switching means, these triggering means comprising thrusting means which, at the end of the piston stroke, come to bear against stops which re fixed relative to the envelope, wherein:
• the switching means are carried by a lantern ring with a side wall coaxial with the piston, driven by this piston but capable of adopting two different sable positions relative to the piston,
• the elastic means are arranged on the outside of the lantern ring and are guided internally by the side wall of the lantern ring,
• and at least one push-rod is provided at each axial end of the lantern ring, the push-rod or push-rods of one end being independent of the push-rod or push-rods of the other end of the lantern ring, the push-rods bearing against the elastic means and being retained axially by stops provided on the lantern ring, which guides the push-rods in a translational movement.

A hydraulic motor, comprising:

• an envelope;
• a differential piston capable of sliding in a reciprocating movement in the envelope, the piston having two parts of different diameters capable of moving in two corresponding chambers of the envelope;
• hydraulic switching means for supplying and evacuating the respective chambers, these switching means being driven by the piston and able to adopt two stable positions relative to the piston;
• control means for an abrupt change in the position of the switching means relative to the piston, comprising elastic means capable of storing energy;
• and triggering means capable, at the end of the stroke of the piston, of releasing the energy stored by the elastic means and of causing the abrupt change in position of the switching means, these triggering means comprising thrusting means which, at the end of the piston stroke, come to bear against stops which are fixed relative to the envelope, wherein:
• the switching means arc carried by a lantern ring with a side wall coaxial with the piston, driven by this piston but capable of adopting two different stable positions relative to the piston,
• the elastic means are and on the outside of the lantern ring and are guided internally by the side wall of the lantern ring,
• and the lantern ring is held stable in one of its two positions relative to the piston by a device of the toggle-joint type, with three axes, comprising a connecting rod and a trigger.