| 摘要 |
PURPOSE: To provide an inscribing type oil pump rotor having the proper number of engaging teeth and small surface pressure stress. CONSTITUTION: An inner rotor 3 and an outer rotor 2 having an inner tooth part 2A having the number of teeth more than that of the teeth of the outer tooth part 3A of the inner rotor 3 by one tooth mesh with each other to be incorporated under the eccentric condition. The inner rotor 3 has a trochoidal tooth form satisfying an expression; 0.120<=e.n/(π.D)<=0.140 (where (n) is the number of the outer teeth 3A, e: mm the eccentric amount and D: mm the diameter of addendum circle). Thus, the durability and low noise property of an inscribing type oil pump rotor 1 can be improved.
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