| 摘要 |
Provided is an oil pump rotor capable of improving a volume efficiency and a quietness. When a diameter of a base circle bi of an inner rotor is ¦ bi; a diameter of a first outer rolling circle Di is ¦ Di; a diameter of a first inner rolling circle di is ¦ di; a diameter of a base circle bo of an outer rotor is ¦ bo; a diameter of a second outer rolling circle Do is ¦ Do; a diameter of a second inner rolling circle do is ¦ do; and an eccentricity amount between the inner rotor and the outer rotor is e, ¦ bi = n·( ¦ Di + ¦ di) and ¦ bo = (n + 1)·( ¦ Do + ¦ do) hold; either ¦ Di + ¦ di = 2e or ( ¦ Do + ¦ do = 2e holds; and ¦ Do > ¦ Di and ¦ di > ¦ do hold. When a clearance between the inner rotor and the outer rotor is t, 0.3 ‰¤ (( ¦ Do + ¦ do) - ( ¦ Di + ¦ di))·(n + 1)/t ‰¤ 0.6 holds, provided that ¦ Di + ¦ di = 2e; or 0.3 ‰¤ (( ¦ Do + ¦ do) - ( ¦ Di + ( ¦ di))·n/t ‰¤ 0.6 holds, provided that ¦ Do + ¦ do = 2e. |
