| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic system capable of simultaneously actuating three or more hydraulic functions requiring a distinct pressure limitation without providing separate pressure relief valves for each of the hydraulic functions. SOLUTION: The hydraulic system is provided with at least one of main hydraulic functions and a plurality of subsidiary hydraulic functions. All of them are connected to a supply passage and a return passage in parallel. The first pressure relief valve prevents pressure in the supply passage from exceeding first limitation and the second pressure relief valve prevents pressure in the subsidiary function from exceeding second pressure limitation lower than the first limitation. The hydraulic system is provided with a new pressure relief circuit which can be provided on three or more hydraulic functions one of two pressure limitations only with somewhat two pressure relief valves. COPYRIGHT: (C)2007,JPO&INPIT
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