| 摘要 |
In a negative pressure booster according to the present invention, a valve-body-side fixed portion (20f) at a rear end portion at a position rearwardly of an accordion portion (20b) of a boot (20) provided between a rear shell (3) and an input shaft (11), and the valve-body-side fixed portion (20f) is fixed to a valve body auxiliary member (30). An input-shaft-side fixed portion (20d) is provided at a rear end of the boot (20) at a position rearwardly of the valve-body-side fixed portion (20f), and the input-shaft-side fixed portion (20d) is fixed to the input shaft (11). Then, atmosphere inlet ports (20a) are formed radially on a side surface portion of the boot (20) between the valve-body-side fixed portion (20f) and the input-shaft-side fixed portion (20d), and a filter (22) is stored in the boot (20) between the valve-body-side fixed portion (20f) and the input-shaft-side fixed portion (20d). Accordingly, an inflow noise of atmosphere is prevented, and a contamination removing function of the filter is satisfactorily maintained. |
