Foil journal bearing applicable to high speed machining center

摘要

A foil journal bearing applicable to high speed machining and grinding machines for machining microscopic features. A single foil is secured to and supported by a hollow, generally cylindrical, housing. The foil has a length substantially equal to twice the interior circumference of the housing and a mounting feature, extending across its width, for engagement with a feature of complementary shape in the housing. One portion of the foil has a length approximately equal to one half of the foil length, and comprises a bump foil and a plurality of regions comprising groups of generally uniformly-spaced ridges and flats, the regions being separated by extended flat regions. The other portion of the foil has a length approximately equal to one half of the foil length, and comprises the top foil and is generally flat and overlies the bump foil which overlies the interior of the housing.

主权项

1. A foil journal bearing comprising a top foil overlying a bump foil and supported by a hollow, generally cylindrical housing with a cylinder axis and an interior circumference, the bump foil comprising a plurality of ridges and flats oriented generally parallel to the cylinder axis;
the top foil and the bump foil each being secured to the housing and each having a length substantially equal to the interior circumference of the housing, and a width substantially equal to the length of the housing; each top foil and bump foil having a mounting feature, extending across its width, for engagement with at least a feature of complementary shape in the housing; the bump foil comprising a plurality of regions comprising groups of generally uniformly-spaced ridges and flats, the regions being separated by extended flat regions.