Patent ID: 8671674

Claim:
A hydrostatic transmission apparatus for a mobile machine having a front group of drive members and a rear group of drive members, a pump, a first linking motor and a first linked motor respectively contributing to driving a first one and a second one of the front and rear groups of drive members; the first linking motor and the first linked motor being connected via a first series duct and being respectively connected to a first orifice of the pump and to a second orifice of the pump, thereby constituting a closed transmission circuit; at least one pressure-limiting valve being interposed between said series duct and a low-pressure circuit, said at least one pressure-limiting valve being suitable for connecting said first series duct to said low-pressure circuit while being controlled as a function of the high pressure of the pump, wherein said at least one pressure-limiting valve is also controlled as a function of at least one parameter relating to operating conditions of the apparatus, which parameter is chosen from among the inclination of the mobile machine, the steering angle through which the wheels of the machine are steered, or the type of mobile machine.