| 摘要 |
PROBLEM TO BE SOLVED: To reduce a clearance between a two-surface width portion of a drive rotor and a two-surface width portion of a crankshaft while maintaining an efficiency of fitting a shaft hole of the drive rotor in the crankshaft. SOLUTION: An oil pump includes: the drive rotor 2 which has the shaft hole 21 fitted to the crankshaft 4 and two or more external teeth, and has a hole-side 2-surface width portion 23 formed to the shaft hole 21 and fitted to an axis-side 2-surface width portion 42 provided for the crankshaft 4; a driven rotor 3 that has internal teeth that engages with the external teeth of the drive rotor 2 in an eccentric condition; and a housing that houses the drive rotor 2 and the driven rotor 3, wherein the axis-side 2-surface width portion 42 and the hole-side 2-surface width portion 23 incline toward an axis end side of the crankshaft 4. COPYRIGHT: (C)2011,JPO&INPIT
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