PRESSURE DETECTION DEVICE OF HYDRAULIC CIRCUIT

PROBLEM TO BE SOLVED: To improve reliability, and to reduce manufacturing cost, by dispensing preparation of a pressure sensor having a different specification in each detection place, concerning a hydraulic circuit in a working vehicle or the like. SOLUTION: A pressure switch 10 working so as to output an ON-signal with a lowly set pressure lower than a pressure switch 100 is provided. Hydraulic equipment 12, 13, 14 for depressurization for guiding a pressurized oil in a pump discharge oil path 22 to a tank 50 after depressurizing it to reach a working pressure of the pressure switch 10 on a disposal position 11d of the pressure switch 10 when the pressurized oil in the pump discharge oil path 22 reaches a working pressure of the pressure switch 100 are provided on an oil path 11 for depressurization. The oil path 11 for depressurization comprises an oil path 11a on the upstream side of the pressure switch 10 from the viewpoint of the tank 50, and oil paths 11b, 11c provided in parallel on the downstream side of the pressure switch 10 and communicated with the tank 50. COPYRIGHT: (C)2006,JPO&NCIPI