A stabilization system for a wheeled vehicle equipped with a load-carrying arm, the vehicle comprising a main chassis, on which at least one axle carrying wheels is mounted oscillating about a bearing;
- an arm cylinder associated with a load-carrying arm to adjust the inclination of the arm cylinder relative to the main chassis;
- wherein the system comprises:
- an oscillating chassis connected to said axle at two connection points located at a distance from said bearing, on either side of the bearing and symmetrically to the axis thereof;
- the connection of the oscillating chassis to the axle allows the chassis to oscillate with the axle;
- said load-carrying arm is intended to be mounted on the oscillating chassis;
- a first compensation cylinder connected to a first of said connection points to said main chassis and a second compensation cylinder connected to the second of said connection points to said main chassis;
- a first compensation cylinder is located opposite the arm and the second compensation cylinder is located on the side of the arm;
- a proportional distributor;
- an upper chamber of the first compensation cylinder and a lower chamber of the second compensation cylinder are connected by a same first pipe to a port located on a first side of a slide-valve of the distributor, while the lower chamber of the first compensation cylinder and the upper chamber of the second compensation cylinder are connected by a same second pipe to another port located on the first side of the slide-valve of this distributor;
- the lower chamber of the arm cylinder is connected to a port located on a second side of the distributor slide-valve, opposite to said first side, and another port of the slide-valve located on the second side is connected to a tank of fluid;
- the distributor slide-valve includes a first section which, in a first position of the slide-valve, puts the upper and lower chambers of the compensating cylinders in communication with the tank of fluid and puts the lower chamber the arm cylinder in a stopping position stopping the flow of fluid;
- the slide-valve comprises a second section which, in a second position of the slide-valve, puts the upper chamber of the first compensation cylinder and the lower chamber of the second compensation cylinder in communication with the lower chamber of the arm cylinder and simultaneously puts the lower chamber of the first compensation cylinder and the upper chamber of the second compensation cylinder in communication with the tank of fluid;
- the distributor is associated with piloted actuating device making it possible to normally maintain the slide-valve in said first position, to gradually bring the slide-valve from said first position to said second position, and to gradually bring the slide-valve from said second position to said first position;
- an axle tilt sensor detecting an inclination of the axle in which the wheel of the vehicle opposite the arm is raised;
- and
- a calculator connected on the one hand to this tilt sensor and on the other hand to said piloted actuation means of the distributor slide-valve;
- in the event of the axle tilting in a manner that tends to raise the wheel situated on the side opposite the arm, the calculator controls these actuating device in such a way as to control the gradual passage of the slide-valve of the distributor from said first position to said second position according to the detected inclination of the axle.