Fluid-pressure apparatus with gears having tooth profiles
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United States of America Patent
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Jun 14, 2016
Grant Date -
Oct 30, 2014
app pub date -
Aug 9, 2012
filing date -
Dec 6, 2011
priority date (Note) -
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Abstract
A pair of meshed gears is disposed in a hydraulic chamber of a housing. Bushes in the chamber contact both end surfaces of the gears. Edge surfaces of the gears are chamfered at intermediate parts between tooth tips and tooth bottoms, and the inclination of the intermediate parts is larger than those of the tooth tips and bottom, thereby protecting the edges from damage due to contact force as the gears mesh and preventing leakage between the gears and the support members. Accordingly, the gears may be operated quietly, at high output efficiency, and increased reliability for an extended period.
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