| 摘要 |
PURPOSE:To keep the posture of a cab flat at all times by controlling each hydraulic actuator which supports each point in the front and rear and on the right and left of the cab on a car frame based on displacement amount of roll, pitch, and up and down displacement of the cab and displacement speed due to each transverse, front and rear, up and down acceleration. CONSTITUTION:A bottom frame 3a of a cab 3 is supported on a car frame 25 by a hydraulic actuator 19 and a spring 21a at four points in the front and rear and in the right and left of the cab 3 in such a way that it can change its posture freely. The amount of relative up and down displacement between the cab 3 and the car frame 25 is detected by a car height sensor 28. Also, the amount of relative up and down displacement between the car frame and an axle 30 is detected by a car height sensor 31. Further, a transverse acceleration sensor 32, a front and rear acceleration sensor 33, and an up and down acceleration sensor 34 are installed near the center of gravity of the cab 3, and displacement speed of roll, pitch, and up and down displacement of the cab 3 is obtained based on these outputs. Control force which suppresses roll, pitch, and up and down displacement of the cab 3 is obtained based on each displacement speed and each displacement amount so as to control an oil amount control valve to adjust oil amount of each hydraulic actuator 19. |
