| 摘要 |
PROBLEM TO BE SOLVED: To maintain excellent delivery flow rate performance by effectively suppressing oil leakage especially at high temperature with simple and low cost structure. SOLUTION: This oil pump accommodates an inner rotor 31 and an outer rotor 32 forming pump rooms V1, V2, etc., in a pump casing 21. The outer rotor 32 is formed by material of relatively low coefficient of linear expansion, for example, a ferrous sintered alloy, while the inner rotor 31 is formed by a material of larger coefficient of linear expansion compared to that of the outer rotor 32, for example, an aluminum alloy.
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