PNEUMATIC CYLINDER DEVICE FOR TRAILER OR SEMITRAILER VEHICLES

摘要

A pneumatic cylinder device (10) for trailer or semitrailer vehicles which, according to the angle of rotation between the truck (46) and the semi-trailer (35) or between the tractor (47) and the trailer (48), assumes an angular position which transmits the command for power assisted steering of the wheels on the steering or self-steering axle of the respective semi-trailer (35) or trailer (48). The pneumatic cylinder (11) is a single-action device and a base (24), the end of the latter attached to an additional pin (28) fixed on a semi-trailer (35) or, respectively, on a trailer (48), the cylinder (11) housing a piston (21) which slides along the cylinder and a rod (14; 26) connected to the piston (21), the rod (14; 26) acting as a longitudinally extending and transversally rigid tie rod for the presence of pressurised air supplied to the inside of the cylinder through a supply hole (23).