| 摘要 |
An oil pump structure is provided to maintain an oil pump gear at the same axial position as an engine block even when the engine block is heated and a torsion is generated in an oil pump housing, thereby reducing noise in an oil pump. An oil pump structure includes an engine block(10), an oil pump housing(20), a rotary pump, and an oil pump gear(12). A crank shaft gear is engaged with one side of the engine block. Oil is introduced into and discharged from the oil pump housing. The rotary pump includes an internal rotor(22) and an external rotor(23). The oil pump gear has the same shaft as the rotary pump and is engaged with the crank shaft gear to be rotated together. The oil pump gear is rotatably coupled with a shaft(13) fixed to one side of the engine block. A bearing(14) is provided between the oil pump gear and the shaft. A bearing fixing member(15) is provided on the outer peripheral surface of the shaft.
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