Manufacturing tool for fluid dynamic bearing
AssigneeFoxconn Technology Co., Ltd.
InventorsWun-Chang Shih, Huan-Chao Lin, Ching-Hsing Huang, Chien-Long Hong, Hsien-Sheng Pei
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Abstract
A manufacturing tool (20) for forming a dynamic pressure groove (52) in an inner peripheral surface of a bearing sleeve (50) includes a tool shaft (21) for being rotated in a bore of the bearing sleeve while being moved in an axial direction thereof. Protrusions (25) are integrally and circumferentially arranged on an outer periphery of the tool shaft near a leading end (22) thereof. Machining tips (26) are integrally formed on outmost ends of the protrusions for machining the inner peripheral surface of the bearing sleeve to form the dynamic pressure groove therein.
Claims16
A manufacturing tool for forming a dynamic pressure groove in an inner peripheral surface of a bearing sleeve, the manufacturing tool comprising:
- a tool shaft for being rotated in a bore of the bearing sleeve while being moved in an axial direction thereof;
- and
- a plurality of machining tips integrally formed on the tool shaft for interferentially engaging with the inner peripheral surface of the bearing sleeve to form the dynamic pressure groove thereby;
- wherein a plurality of protrusions are integrally and circumferentially arranged on an outer periphery of the tool shaft near a leading end thereof, and the machining tips are respectively integrally formed on outmost ends of the protrusions.
A manufacturing tool for forming a dynamic pressure groove on an inner peripheral surface of a bearing sleeve, the manufacturing tool comprising:
- a tool shaft comprising a leading end;
- a plurality of machining tips integrally formed around an outer periphery of the tool shaft near the leading end thereof, each of the machining tips comprising a top and a root, the tops being commonly located in a hypothetical circle that is concentric with the tool shaft;
- and
- a guiding surface joining the root of each of the machining tips to the outer periphery of the tool shaft;
- wherein
- when the tool shaft is rotated in a bore of the bearing sleeve while being moved in an axial direction thereof, the machining tips abut against the inner peripheral surface of the bearing sleeve to form the dynamic pressure groove therein.
A manufacturing tool for forming a dynamic pressure generating groove in a fluid dynamic bearing, comprising:
- a coupling end adapted for receiving a rotational movement and a linear movement simultaneously;
- a tool shaft extending from the coupling end and comprising:
- a plurality of protrusions formed on an outer circumference of the tool shaft;
- and
- a plurality of machining tips on the protrusions, respectively, wherein the protrusions are integral to the tool shaft and the tips are integral to the protrusions, the machining tips being adapted for forming the groove;
- wherein the tool shaft further comprises a recess, and the protrusions and machining tips are located in the recess;
- wherein the tool shaft further comprises two flanges on the outer circumference thereof, and the recess is defined between the two flanges;
- and
- wherein a circle circumscribing the protrusions has a diameter that is substantially the same as that of one of the flanges.
Dependencies are inferred from the claim text.