| 摘要 |
PURPOSE:To keep the body of a truck crane and the like horizontal by obtaining a mean value of detected stroke values for two hydraulic cylinders at the side of a front axle and on the other hand adjusting the detected stroke values of each hydraulic cylinder at the side of a rear axle through the independent comparison thereof with reference values. CONSTITUTION:For hydraulic cylinders 10 and 12 at the front wheel side, a hydraulic fluid is supplied to and displaced from each oil passage concurrently, depending upon the result of comparison between the detected stroke values of said cylinders 10 and 12, and predetermined reference values. On the other hand, the hydraulic fluid is separately supplied to and displaced from each oil passage for hydraulic cylinders 16 and 18 at the rear wheel side, depending upon the result of comparison between the detected stroke values of said cylinders 16 and 18, and predetermined reference values. According to the aforesaid constitution, each of the hydraulic cylinders 10, 12, 16 and 18 can be adjusted to the reference values and the body of a crane and the like can be kept horizontal, while a vehicle is running. |
