Self-propelled vehicle, in particular self-propelled load-handling vehicle

Self-propelled vehicle (1), notably a self-propelled load-handling vehicle, said vehicle (1) comprising a front driving and steering axle (2) with two front wheels (4) and a rear driving and steering axle (3) with two rear wheels (5), each axle (2, 3) being equipped with a steering mechanism (6), each steering mechanism (6) comprising a double-acting hydraulic cylinder (7) which can be connected to a pressurized-fluid source (17, 18), said cylinder (7) comprising a body (8) which is elongate from one end to the other end of said body and two pistons (91, 92), each associated with an output rod (101, 102) for directional control of one wheel of the axle, said pistons (91, 92) dividing the body (8) into a chamber (11), referred to as central chamber, extending between the pistons (91, 92) and two end chambers (121, 122) each disposed on a rod (101;

• 102) side, said vehicle (1) comprising two configurations and a selector for selecting one configuration or the other, the first configuration, referred to as normal configuration, corresponding to a configuration in which the wheels (4, 5) of one and the same axle (2, 3) extend in substantially parallel planes, the second configuration, referred to as “O” configuration, corresponding to a configuration in which the wheels (4, 5) of the vehicle are placed on a circle (C) of which the center passes through an axis (A) referred to as vertical axis, for a rotation of the vehicle (1) on itself about said axis (A), the central chamber (11) of each cylinder (7) not being supplied with fluid in the first configuration such that, in this first configuration, the cylinder (7) of each steering mechanism (6) forms the equivalent of a cylinder with a piston and two rods, the central chamber (11) being in the second configuration, in which it is able to be supplied with fluid, characterized in that the vehicle (1) comprises, to fluidically connect the cylinders (7) of the steering mechanisms (6) to the one or more pressurized-fluid sources (17, 18), a first and a second fluid circuit (15, 16), the first fluid circuit (15) being an active circuit in the first configuration, the second fluid circuit (16) being an active circuit in the second configuration, the second fluid circuit (16) being, for the cylinder (7) of each steering mechanism (6), configured such that, when the central chamber (11) of said cylinder forms an intake chamber, the end chambers (121, 122) of said cylinder form exhaust chambers, and vice versa, this second fluid circuit (16) being equipped with a flow splitter (25) for supplying each end chamber (121, 122) with fluid at the same flow rate.