| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of part items as well as to lessen operation processes in time of manufacturing. SOLUTION: A sealing member 3 is provided with a contact part 3d being more projected up to the front side than a stopper part 1B of a shell. When a key member 27 is situated in a nonoperational position, first of all, it contacts with this contact part 3d of the sealing member 3, then this contact part 3d is compressed to some extent and thereby the key member 27 contacts with the stopper part 1B of the shell and thus it is stopped at this nonoperational position. Accordingly, it is unnecessary to install a knocking preventing stopper in the key member 27. Therefore, the number of part items of a brake servo unit and manufacturing processes are reducible as compared with the part, and thus this brake servo unit can be made inexpensive in cost. |
