| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure type booster capable of suppressing increase of sliding resistance between a valve body and a filter.SOLUTION: A negative pressure type booster includes: an air introduction path 221 which is divided by a valve body 22 and connects the air and an air valve V2; and a filter 5 which is arranged on the air introduction path 221 slidably on the valve body 22 and is formed of an insertion hole 51 inserting an input shaft member 31 therethrough. Therein, at least a part of an inner circumferential surface 51a of the insertion hole 51 is departed from the input shaft member 31 so as to communicate one side of the filter 5 with the other side thereof, in such a state that the valve body 22 and the input shaft member 31 are parallel to each other or in the maximum inclined state of the input shaft member 31.SELECTED DRAWING: Figure 2 |
