Plunger driving structure
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United States of America Patent
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Sep 18, 2012
Grant Date -
Mar 29, 2007
app pub date -
Sep 25, 2006
filing date -
Sep 26, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An oil pump comprises a rotation shaft having an eccentric part, a needle roller bearing supporting the eccentric part of the rotation shaft, a tappet abutting on the outer ring of the needle roller bearing and arranged in a radial manner, a plunger arranged on the tappet and reciprocated by the rotation of the rotation shaft, and a balancer arranged on both ends of the eccentric part. The balancer has a large diameter part and a small diameter part and when the large diameter part is arranged so as to face the direction opposite to an eccentric direction, the rolling space of a roller can be projected from an axial direction through the balancer.
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