| 摘要 |
PURPOSE: To easily design operation timing of a pressure switch by positioning a seal cap in a fluid supply chamber so as not to slide against a guide hole, and setting up operation pressure so as to consider only the spring force of a spring member. CONSTITUTION: When pressure of hydraulic oil in a hydraulic oil supply chamber 12 is lower than specified pressure, the spring force of a compressed coil spring 27 overcomes the pressure of the hydraulic oil. The other surface of a spring bracket 26 is energized in a position plugging one opening end of a guide hole 15, and the end surface on the large diameter side of a seal cap 18 separates from the other opening end of the guide hole 15. The seal cap 18 is positioned in the hydraulic oil supply chamber 12, and does not slide on the guide hole 15. When the pressure in the hydraulic oil supply chamber 12 overcomes the spring force of the compressed coil spring 27 and the large diameter side of the seal cap 18 elastically enters the gap between the guide hole 15 and a plunger 16, the gap between the guide hole 15 and the plunger 16 is completely sealed. Operation timing of a pressure switch is easily designed. |
