Thermal compensation for fluid dynamic bearing using bimetal parts
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United States of America Patent
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May 23, 2000
Grant Date -
N/A
app pub date -
Oct 23, 1998
filing date -
Oct 23, 1998
priority date (Note) -
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Abstract
A bimetallic part is formed from metals or comprises metals with different thermal expansion coefficients. A first element defines the part and defines one surface of the bearing gap and has a first coefficient of expansion and a second element is wholly or partially inserted into and constrained within the first element and having a different coefficient of thermal expansion so that as the temperature changes, the stress created by the differential expansion of the two elements will cause the overall part to deform elastically as a function of temperature. This deformation will cause the gap, the elements being properly selected, to narrow as temperature rises (and viscosity falls) and to widen as temperature falls (and viscosity rises).
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