| 摘要 |
PROBLEM TO BE SOLVED: To inhibit pump efficiency deterioration caused by displacement of a casing.SOLUTION: A fuel pump includes an inner rotor 120, an outer rotor 130, a casing 116, and a housing 102. The inner rotor 120 has external teeth 122. The outer rotor 130 has internal teeth 132a which engage with the external teeth 122. The casing 116 houses the outer rotor 130 and inner rotor 120 and forms a pump chamber 140 which changes its volumetric capacity between the internal teeth 132a and the external teeth 122. The housing 102 is formed into a cylindrical shape and the casing 116 is press-fitted in a cylinder inner part. Recessed parts 116r which are recessed to a radial center side of an outer peripheral surface 116g are formed at circumferential predetermined portions of the outer peripheral surface 116g of the casing 116.SELECTED DRAWING: Figure 4 |
