Abstract
In an oil-hydraulic system, since a positive displacement pump is generally employed, pressure pulsation is generated, which causes oscillation, noise and so on. In general, an accumulator is interposed to suppress it. However, when using an accumulator, regular maintenance is necessary to maintain its performance. Therefore, it seems to be necessary to develop an oil-hydraulic component to reduce pressure pulsation with simple structure and without regular maintenance. In this study, a component to reduce pressure pulsation in oil-hydraulic system is proposed. This component consists of a pipe-shaped metal body and a silicone rubber tube. The silicone rubber tube is inserted into the body. The side of the body has 4 holes, and the surface of the silicone rubber in the metal body is exposed to the atmosphere through these holes. When the pressure is increased, the part of the silicone rubber expands and prevent the increase of the pressure. Then, the energy is stored as elastic energy in the silicone rubber. The elastic energy is transferred back to the oil when the pressure is decreased. This energy transfer prevents the decrease in the pressure. These processes are assumed to be effective for preventing the pressure pulsation. The component is fabricated and some experiments carry out to make clear the validity of the mechanism and the basic characteristics of this component. Based on the experimental results, it becomes clear that the fluctuation range of the pressure pulsation becomes one-tenth by the use of the proposed component.
