Research on an Oil-hydraulic Component to Reduce Pressure Pulsation

Abstract

Pressure pulsation in oil-hydraulic system is generated due to the use of a positive displacement pump and it causes oscillation, noise and so on. An accumulator is generally employed to suppress the pressure pulsation. However, accumulator needs regular maintenance to prevent its performance deterioration due to gas leakage from it. Furthermore, there is a case where it is difficult to make the size of oil-hydraulic system compact due to the size of accumulator. Therefore, it seems to be necessary for an innovation of an oil-hydraulic system to develop a new oil-hydraulic component to reduce pressure pulsation. In this study, an oil-hydraulic component to reduce pressure pulsation is proposed. The feature of this component is that the structure is simple and the movement of an elastic tube is utilized to suppress pressure pulsation. The component is fabricated and some experiments are carried out to verify the mechanism to reduce pressure pulsation and to make clear its basic characteristics. Consequently, it is made clear that the proposed component and its mechanism are effective to reduce pressure pulsation. In addition to it, it is known that the proposed component can reduce the pressure pulsation of the downstream side of the component by about 43 % of that of the upstream side of it when the average pressure at pump discharge port is 3.5 MPa by setting both the gap width of the component and the hardness of the urethan rubber tube to suitable values.