WING OPENING-CLOSING DEVICE

摘要

PROBLEM TO BE SOLVED: To restrain a twist when opening-closing a wing, while restraining the occurrence of oil leakage in a wing opening-closing device.SOLUTION: A wing opening-closing device 100 opens-closes a wing rotatably connected to an upper part of a cargo chamber and rotating in the vertical direction, and is provided with a pair of motor-driven hydraulic cylinders 10 having integrally an electric motor for rotating by electric power supply and opening-closing the wing by expansibly-contractibly operating by rotation of the electric motor, and a synchronous control part 31 for mutually synchronizing expansion-contraction operation of the pair of motor-driven hydraulic cylinders 10 by controlling rotation of the electric motor.SELECTED DRAWING: Figure 2