| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil pump unit which materializes reduction in driving torque and pulsation noise, simplification of manufacture or the like. SOLUTION: An oil pump unit 5, a double feed pump 21 accommodates a quadruple scavenging pump 22 and a drive shaft 23 in a pump casing 24. In the first and second feed rotor units 46, 47 forming the feed pump 21, respective inner rotors 44 thereof are coupled to each other with a rotation phase of 45°through the medium of a drive ring 53. The drive ring 53 is press-fitted in a drive shaft 53 to drive the first and second feed rotor units 46, 47. In the first-forth scavenging rotor units 56-59 forming the scavenging pump 22, respective inner rotors 54 thereof are coupled to a serration part 74 of the drive shaft 23 so that the rotation phase is delayed by 22.5°. COPYRIGHT: (C)2006,JPO&NCIPI
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