| 摘要 |
PROBLEM TO BE SOLVED: To limit the pressure so as not to significantly exceed a desired maximum using pressure by reducing the rotating speed of an electric motor to limit the hydraulic flow when the current consumption of the electric motor exceeds an upper limit. SOLUTION: When a small, inexpensive pressure limiting valve is used, a characteristic line (b) is given since it is first opened at about 120 bar. When a limit value is exceeded, the bypass flow is reduced by the reduction in rotating speed of an electric motor, and a reduced bypass flow is generated as shown by the characteristic line (b). Accordingly, this bypass flow can provide a more satisfactory effect with a slight economic cost as is apparent from the comparison with the characteristic line (a) in the use of a large, expensive pressure valve. |
