| 摘要 |
PURPOSE: A structure of an oil pump is provided to reduce load on an engine by preventing excessive increase of weight thereof and friction between an internal gear and an external gear even when widths of the internal gear and the external gear is increased. CONSTITUTION: Hollow parts(13) are formed on insides of an internal gear(10) and an external gear(11) to reduce weight of the internal gear and the external gear. Friction between the internal gear and the external gear is reduced thereby so as to improve output of an engine.
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