Hydraulic transmission circuit

A hydraulic transmission circuit comprising:

• at least first and second elementary hydraulic motors that are associated for providing a common drive, each elementary motor having a first and a second secondary enclosures, one for feed and one for discharge;
• at least two main ducts respectively for fluid feed and for fluid discharge;
• a fluid distributor for distributing the fluid from said main ducts to said elementary motors via their secondary enclosures;
• and
• a control system for controlling the elementary motors;
• wherein:
• each of the at least first and second elementary hydraulic motors is either a hydraulic motor or a sub-motor of a hydraulic motor with the sub-motor being a portion of the hydraulic motor, that is capable, when it is fed on its own, of supplying non-zero drive torque to an outlet member of the hydraulic motor, and of doing so regardless of an angular position of said outlet member relative to a stator structure of the hydraulic motor;
• the fluid distributor has valve means connected to the two secondary enclosures of the first elementary motor;
• said valve means are configured to put the first secondary enclosure of the first elementary motor into communication with either one of the two main ducts, independently of the second secondary enclosure, and to put the second secondary enclosure of the first elementary motor into communication with either one of the two main ducts, independently of the first secondary enclosure, whereby the first elementary motor can be put, independently of the operating modes of the other elementary motor(s):
• in inactive operating mode, in which both secondary enclosures of the first elementary motor are connected to a same main duct;
• in drive operating mode, in which the two secondary enclosures of the first elementary motor are connected respectively to the higher pressure main duct and to the lower pressure main duct so that the first elementary motor delivers a drive torque in a desired drive direction that adds to a torque delivered by the other elementary motor(s);
• and
• in opposing operating mode, in which the two secondary enclosures of the first elementary motor are connected respectively to the higher pressure main duct and to the lower pressure main duct so that the first elementary motor delivers an opposing torque in a direction opposite from the desired drive direction, which subtracts from the torque delivered by the other elementary motor(s);
• and
• said valve means are configured so that the first elementary motor can be put, independently of the operating modes of the other elementary motor(s):
• in high-pressure inactive operating mode, in which both secondary enclosures of the first elementary motor are connected to a higher pressure main duct having a higher pressure than the other main duct;
• and
• in low-pressure inactive operating mode, in which both secondary enclosures of the first elementary motor are connected to a lower pressure main duct having a lower pressure than the other main duct.