A check valve of a vacuum booster device is provided with a main body assembled in a vacuum pressure inlet port, a first passage, an accommodating portion and a second passage, a valve seat formed in the first passage, a valve body accommodated in the accommodating portion, and a spring which urges the valve body toward the valve seat. The spring is configured to include an end coil portion which engages with a spring seat, an expanding and contracting coil portion which expands and contracts and is separated from a flange portion of the valve body, and a linking coil portion which is separated from the flange portion and the spring seat and links the end coil portion and the expanding and contracting coil portion.
VACUUM BOOSTER DEVICE
2020-08-06
Patent
Electronic Resource
English
Vacuum booster structure, vacuum booster assembly and moving body with vacuum booster assembly
European Patent Office | 2020
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