| 摘要 |
PURPOSE:To prevent the occurrence of impact noises, by inserting a ring made of a magnetic material into the coil of a solenoid valve, disposing an attractor having a shaft projected from the central portion of the same, and forming a hole in a plunger in the manner that said shaft can be slided in the hole. CONSTITUTION:A ring 13 made of a magnetic material is inserted into a through-hole 9 formed at the central portion of the coil 18 of a solenoid valve such that it is located at the upper portion of the hole 9, and an attractor 26 having a shaft 25 projected from the central portion of the same is disposed on the inside of the ring 13. Further, a hole 30 is formed in a plunger 33 in the manner that the shaft 25 can be slided in the hole 30. With such an arrangment, the length of a spring 29 loaded between the attractor 26 and the plunger 33 can be made sufficiently long. Further, when a stepped portion 32 of the plunger 33 comes to the position of the lower end 36 of a housing 17, the clearance between the plunger 33 and the housing 17 is increased abruptly and the magnetic force is decreased, so that the plunger 33 stops it upward movement at the instant. Therefore, it is enabled to prevent production of impact noises caused when the plunger 33 and the attractor 26 come into contact with each other. |
