To provide a non-return valve for a negative pressure type booster which inhibits occurrence of vibration and abnormal noise (contact sound) of the non-return valve caused by negative pressure pulsation.SOLUTION: A non-return valve 10 of a negative pressure type booster 2 includes: a body 11 assembled to a negative pressure introduction port 3; a first passage 111c, a housing part 112a, and a second passage 112b; a valve seat 12 formed at the first passage 111c; a valve body 13 housed in the housing part 112a; and a spring 14 which biases the valve body 13 to the valve seat 12. The spring 14 is formed so as to include: an end coil part 141 engaged with the spring seat 131d; an expansion/contraction winding part 142 which expands and contracts while separating from a flange part 131e of the valve body 13; and a connection winding part 143 which separates from the flange part 131e and the spring seat 131d and connects the end coil part 141 to the expansion/contraction winding part 142.SELECTED DRAWING: Figure 2
【課題】負圧脈動に起因する逆止弁の振動及び異音(当接音)の発生を抑制する負圧式倍力装置用逆止弁を提供すること。【解決手段】負圧式倍力装置2の逆止弁10は、負圧導入口3に組み付けられた本体11と、第一通路111c、収容部112a及び第二通路112bと、第一通路111cに形成される弁座12と、収容部112a内に収容される弁体13と、弁体13を弁座12に向けて付勢するスプリング14とを備えている。スプリング14は、ばね座131dに係止される座巻部141、弁体13のフランジ部131eから離間して伸縮する伸縮巻部142、及び、フランジ部131e及びばね座131dから離間して座巻部141と伸縮巻部142とを連結する連結巻部143を含むように構成される。【選択図】図2
NEGATIVE PRESSURE TYPE BOOSTER
負圧式倍力装置
2019-05-23
Patent
Electronic Resource
Japanese