| 摘要 |
A bearing receiving portion includes a receiving space that receives a bearing, which rotatably supports an end portion of a shaft. The bearing receiving portion includes an intermediate inner diameter portion, which receives the end portion of the shaft, and a small inner diameter portion, which includes a column shape space having an inner diameter that is smaller than an outer diameter of the end portion. Fuel in an inside of a housing flows into or flows out relative to the receiving space. When the shaft is moved toward an upside, the fuel, which is accumulated in a space formed by a bottom wall, an inner wall and an end surface, functions as a damper to reduce a relative moving speed of the shaft relative to the bearing receiving portion. |
