| 摘要 |
<p>PURPOSE:To prevent generation of noise or vibration by providing a liquid column reducing means for absorbing a liquid column vibration generated at a specific rotation speed zone of a pump at a liquid supply passage between the pump and a pressure pulsation absorbing means. CONSTITUTION:Pressure oil from a pump 16 is supplied to shock absorbers 28fr to 28rl through pressure control valves 25fr to 24rl. Here, pressure pulsation caused by flow rate pulsation of the pump 16 is reduced by a pressure pulsation absorbing means 22 of a pressure pulsation absorbing device 46. Also, liquid column vibration generated at a specific rotation speed zone of the pump 16 arising because the pressure pulsation absorbing means 22 is incorporated into a liquid supply passage 18 is reduced by a liquid column vibration reducing means 20. Thus, generation of unpleasant noise or vibration caused by pressure pulsation and liquid column vibration can be restricted and durability of the pump and piping can be improved.</p> |
