| 摘要 |
A fuel pump is provided with: a motor (20); an impeller (39) that has a fitting hole (44) that fits to an output end (37) of a rotation shaft (31) of the motor (20); and a case (48) that has a pump chamber (41), which houses the impeller (39), an intake hole (13), which penetrates from the pump chamber (41) to one side in the shaft direction, and a discharge hole (47), which penetrates from the pump chamber (41) to the other side in the shaft direction. The outer wall surface of the output end (37) includes a pair of first planes (51, 52, 96, 97) that are formed at different places in the peripheral direction. The inner wall surface of the fitting hole (44) includes include a pair of second planes (61, 62, 91, 92) that are formed at different places in the peripheral direction. The clearance (65, 101) between the first plane (51, 96) on one side and the second plane (61, 91) on the one side increases heading from one side to the other side in the shaft direction in a state in which the rotation shaft (31) and the impeller (39) are disposed concentrically. |
