Inner rotor of internal gear pump having convex small circular arc parts
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United States of America Patent
Stats
-
Aug 11, 2009
Grant Date -
Sep 25, 2008
app pub date -
Jan 12, 2005
filing date -
Jan 12, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A crankshaft and an mounting hole have two main circular arc parts on the same circle; and two connecting parts for connecting the adjacent main circular arc parts, and have a cross-sectional shape in which the connecting parts facing each other are substantially parallel. The connecting parts of the mounting hole are formed in the shape of a large circular arc which projects inward. The torque of the crankshaft is transmitted to the mounting hole in a state where the connecting parts of the crankshaft and the connecting parts of the mounting hole which are formed in the shape of a large circular arc come into line contact with each other; therefore, the value of any local stress generated in the mounting hole can be reduced.
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