Fluid dynamic bearing
AssigneeFoxconn Technology Co., Ltd.
InventorsChu-Wan Hong, Jung-Yuan Wu
Life of this patent
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Abstract
A fluid dynamic bearing assembly includes a bearing sleeve (30) having an inner surface and a rotary shaft (30) rotatably received in the bearing sleeve. The rotary shaft has an outer surface. One of the inner surface of the bearing sleeve and the outer surface of the rotary shaft forms a dynamic pressure generating groove pattern (10). The groove pattern includes a plurality of grooves (12) extending from a center area toward one edge of the groove pattern. Each of the grooves has at least one of a depth and a width decreasing from the center area toward the edge.
Claims14
A fluid dynamic bearing assembly comprising:
- a bearing sleeve having an inner surface;
- and
- a rotary shaft rotatably received in the bearing sleeve, the rotary shaft having an outer surface, one of the inner surface of the bearing sleeve and the outer surface of the rotary shaft forming a dynamic pressure generating groove pattern, the groove pattern comprising a plurality of grooves extending from a center area toward one edge of the groove pattern, at least one of a depth and a width of each of the grooves decreasing from the center area toward the edge;
- wherein each of the grooves is generally V-shaped and has first and second branches;
- wherein oil reserving cavities are formed at the center area, communicating with both of the first and second branches of the grooves;
- and
- wherein oil channels are formed at the center area to communicate the oil reserving cavities with one another.
A fluid dynamic bearing assembly comprising a pair of relatively rotatable surfaces, one of which forms thereon a dynamic pressure generating groove pattern comprising a plurality of first and second groove branches extending from a center area toward top and bottom edges of the groove pattern, respectively, a plurality of oil reserving cavities being formed in the center area and communicating with the first and second groove branches;
- wherein each of the first and second groove branches has a depth decreasing from the center area toward respective one of the top and bottom edges of the groove pattern;
- and
- wherein the depth of the first and second groove branches decreases gradually.
A fluid dynamic bearing assembly comprising:
- a sleeve;
- a shaft rotatably received in the sleeve;
- and
- a dynamic pressure generating groove pattern formed on one of the shaft or the sleeve whereby when the shaft is rotated, lubricant oil received between the shaft and the sleeve can generate fluidic pressure to the sleeve to separate the sleeve from the shaft, the groove pattern comprising a plurality of grooves, each of the grooves having a central portion and two branches, the central portion having a volume which is larger than any of the other portions of the each of the grooves;
- wherein the central portion of the each of the grooves has a width that is larger than any of the other portions of the each of the grooves.
Dependencies are inferred from the claim text.