抄録
Environmental problems of global warming are common topics that relate to all people on the earth now. The effort of conservation of energy is already an obligation. The purpose is to reduce the amount of the CO2 exhaust that occupies most of the heat-trapping gas that causes global warming. As for the oil hydraulic unit used for the production machine in the factory, the one of energy conservation or more is strongly requested.
In this paper, it proposes our two kinds of conservation of energy oil hydraulic units. After the problem for a current oil hydraulic unit is clarified, the applied technological means and the effect are shown with the application case such as machine tools and the press machines.
