Oil transfer unit for transferring oil between a stationary part and a rotating part
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United States of America Patent
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Aug 25, 2020
Grant Date -
Oct 26, 2017
app pub date -
Apr 20, 2017
filing date -
Apr 20, 2016
priority date (Note) -
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Abstract
An oil transfer unit has a rotating part extending along an axis, a stationary part provided with an oil mouth, and a floating part coupled to the stationary part; the floating part is provided with a cylindrical surface fitted onto an outer cylindrical surface of the rotating part in a non-contact configuration, with an annular groove therebetween to put the oil mouth into communication with an inner chamber of the rotating part; both sides of the groove are sealed by oil films at a radial gap between the cylindrical surfaces of the floating and rotating parts; the unit has a plurality of recesses, which are delimited outwardly by the floating part and inwardly by the rotating part, are arranged on the opposite axial sides of the groove so as to locally enlarge the radial distance with respect to the radial gap and are inwardly closed by the rotating part.
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