A hydraulic fluid of the present invention contains, as a base oil, an ester having two or more ring structures, the two or more ring structures being at least one selected from an aromatic ring and a saturated naphthenic ring. Particularly, the hydraulic fluid contains an ester having two or more aromatic rings as the base oil. The hydraulic fluid has low energy loss due to compression and exhibits excellent responsiveness when being used in a hydraulic circuit. Consequently, the hydraulic fluid realizes energy-saving, high-speed operation and high precision of control in the hydraulic circuit.
本发明的液压液包含作为基础油的
酯类物质,该
酯类物质具有两个或两个以上的环结构,其中这两个或两个以上的环结构至少包括一个芳香环和一个饱和环。特别地,该液压液包含作为基础油的具有两个或两个以上芳香环的
酯类物质。该液压液由于压缩而导致的能量损失较低,并在液压回路中使用时表现出优异的响应性。因此,该液压液在液压回路中实现了节能、高速运行和高精度控制。