| 摘要 |
PURPOSE:To prevent cavitations from generating and enable to carry out an impact pressure resistance test of two hydraulic pumps or motors for testing forming one set by rotating these pumps or motors in the reverse directions to apply an impact pressure thereto. CONSTITUTION:Two hydraulic motors 4 and 5 for testing are connected to a direction changeover valve 3 so that their output shafts rotate in the reverse directions. Then, when the output shafts of the hydraulic motors for testing are coupled to each other by means of a connecting shaft 11, and the direction changeover valve 3 is changed over to the A ports, the operating oil discharged from the hydraulic pump 1 is fed to A ports 7 and 10, wherein hydraulic motors 4 and 5 for testing tend to rotate to the right. However, by the torque of the output shaft tending to rotate reversely, the driving pressure is applied to the A ports 7 and 10 of the two hydraulic motors 4 and 5 as an impact pressure. |
