| 摘要 |
PURPOSE:To decrease the generation of impact noise during operation of a damper, by a method wherein, independently from a spring through the resilient force of which a damper is forced into pressure contact with a valve seat, a spring for cushioning is provided for starting compression in the middle of suction motion of a shaft to exert a compression force on the shaft. CONSTITUTION:With an electromagnetic coil 43 excited through energization of a solenoid 41, a shaft 44 is attracted through the magnetic force of the electromagnetic coil, and a damper 46 is separated from a valve seat 37 against the resilient force of a spring 48. However, in the middle of the attraction motion of the shaft 44, namely, when the shaft is attracted about 2-3mm to the electromagnetic coil, a spring 50 for cushioning is forced into contact with a catch tool 49, and thereafter, the spring is started to the compressed. Mutual action between a compression force, producing the antiattraction force of the spring 50 for cushioning and the compression force of the main spring 48 causes absoption of film contact of the shaft 44 with a stopper part 45, resulting in a decrease in the generation of impact noise.
|
