| 摘要 |
A fuel pump is provided with an outer gear (30) having a plurality of internal teeth (32a), an inner gear (20) having a plurality of external teeth (24a) and meshing eccentrically with the outer gear, and a pump housing (11) that defines a cylindrical gear housing chamber (56) for rotatably housing the two gears (20, 30). The outer gear and the inner gear rotate while expanding and contracting the volumes of a plurality of pump chambers (40) formed between the two gears, whereby fuel is sequentially drawn into and discharged from the pump chambers. In the pump housing, an inside-diameter corner section (70) that faces an outside-diameter corner section (36) in the outer periphery (34) of the outer gear is provided in an inner periphery (22), and an annular groove (72) formed in an annular shape throughout the entire periphery is provided in the inside-diameter corner section. |
