| 摘要 |
PROBLEM TO BE SOLVED: To suppress dispersion of the clearance in the radial direction and the axial direction between an inner fuel passage and an impeller, and to improve the discharge efficiency or the like by constituting a pump housing of two members. SOLUTION: A pump housing 9 is constituted of two members of an outer housing 10 and an inner housing 12. A fuel passage 15 extending along an outer circumference of an impeller 20 toward an outlet 14 from an inlet 11 is formed in the pump housing 9. An annular projecting part 16 projecting inwardly in the radial direction is formed on a cylindrical part 12A of the inner housing 12, and the fuel passage 15 is divided into a distal side flow passage 17 and an abutting side flow passage 18 by the annular projecting part 16. The distal side flow passage 17 located on the distal side of the inner housing 12 is formed as a recessed groove of U-shaped section which is diagonally inclined with respect to the axis O-O of the impeller 20. COPYRIGHT: (C)2004,JPO
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