| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of noise and vibration in a hydraulic pump system. SOLUTION: An oil pump 105 is driven by a motor 106 to thereby transmit pressure oil to a PS valve 107 via a high pressure hose 111. A rotation sensor 1 detects the rotational frequency of the motor 106. A controller 2 receives the result of detection from the sensor 1 and keeps the rotational frequency of the motor 106 to have a predetermined constant value. Inside the hose 111 a flexible hose is provided which has a length corresponding to the rotational frequency of the motor 106 to be kept. |
