OSCILLATING AXLE FOR A LIFTING MACHINE, LIFTING MACHINE COMPRISING SUCH AN AXLE AND CONTROL METHOD

This oscillating axle (3) for a lifting machine (1) comprises an axle bridge (5) at the ends of which are mounted two ground connection members (7), an oscillation axis (X3), a left cylinder (9) and a right cylinder (11), each cylinder (9, 11) having a rod (90, 110) in contact with the bridge (5) and a body (92, 112) fixed on a fixed part (13) of a chassis (2) of the lifting machine (1), the body (92, 112) forming a chamber (94, 114) in which the rod (90, 110) moves. The axle comprises a hydraulic circuit (15) connecting the chambers (92, 112) of the left (9) and right (11) cylinders to one another, in which is present a fluid at a given pressure, making it possible to press the rods (90, 110) of the left cylinder (9) and the right cylinder (11) against the bridge (5), and at least one solenoid valve (150, 152) on a branch (15A) of the hydraulic circuit (15) connected to the chamber (94) of the left cylinder (9), and at least one solenoid valve (154, 156) on a branch (15B) of the hydraulic circuit (15) connected to the chamber (114) of the right cylinder (11), each of these solenoid valves (150, 152, 154, 156) being able to be positioned in an open position, in which the fluid can circulate freely, and a closed position, in which the fluid is trapped in the chamber (94, 114) of the corresponding cylinder (9, 11). Each of the chambers (94, 114) of the left cylinder (9) and the right cylinder (11) comprises a pressure sensor (23, 25) adapted to measure the pressure of the fluid in each of the chambers (94, 114). Control means (21) are provided to detect a pressure in one of the chambers (94, 114) exceeding a first threshold, and/or a differential between the pressures in each of the chambers (94, 114) exceeding a second threshold, so as to detect the blockage in the closed position of a solenoid valve (150, 152, 154, 156), and to trigger a safety procedure.