HORIZONTAL MAINTAINING DEVICE FOR HYDRAULIC SUSPENSION TYPE TRAILER

摘要

PURPOSE:To stably run a trailer by providing a road lateral gradient detector at a truck frame, operating a hydraulic system and maintaining the frame in a horizontal state. CONSTITUTION:When a trailer 2 starts running on a road D inclined at an angle larger than one degree, the actuator 29 of a switch 27 is advanced by the action of a weight 26 to allow a movable contact 29b to be contacted with a stationary contact 31 to operate a solenoid 36, thereby communicating ports P1, P3 with ports P2, P4 to supply oil from an oil pump 44 to an oil chamber E, and oil in the oil chamber F is returned to a tank 43. As a result, the piston 34b of a balance cylinder 34 is displaced rightwardly to allow oil in the oil chamber H to be supplied to the hydraulic cylinders of the respective wheel assemblies 8 11 and to allow oil in the respective cylinders 20 of right side wheel assemblies 8'-11' to be sucked to the oil chamber G, thereby maintaining horizontality of the frame 14.