US 2006/0140521 A1Published application

Hydrodynamic bearing device and compact motor including hydrodynamic bearing device

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsKaoru Uenosono, Yosei Yoshikawa

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Abstract

A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft, and radial bearing parts constituted of dynamic pressure generating grooves are provided on the inner peripheral surface of the sleeve. As for an inside diameter of the sleeve, an inside diameter in a predetermined range from the opening upper end part is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter in a range at a lower end side from the predetermined range. The predetermined range corresponds to a range including a radial bearing part located at the upper end side.

Claims14

Dependent claims

A hydrodynamic bearing device comprising a sleeve having a bearing hole formed therein, and a shaft inserted in the bearing hole, one of said sleeve and said shaft being fixed and the other being made to be rotatable, wherein

said shaft has a screw hole for fastening another members to the shaft, the screw hole being formed to extend from one end portion of the shaft along a direction of an axis thereof to the other end side past an opening one end portion of the sleeve,
an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft,
radial bearing parts having dynamic pressure generating grooves formed therein are provided on at least one of the inner peripheral surface of the sleeve and the outer peripheral surface of the shaft, and
an inside diameter of the sleeve in a predetermined range including at least an area raging from the opening one end part of the sleeve to a tip end portion of a screw that is screwed into the screw hole is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter of the sleeve in a range on the other end side from the predetermined range.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 11/305,163Filed 19 Dec 2005
Priority: JP 2004-37837128 Dec 2004
Published: 29 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16C 17/107
With grooves in the bearing surface to generate hydrodynamic pressure: with at least one surface for radial load and at least one surface for…
F16C 17/026
For radial load only: with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
F16C 33/107
Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid: grooves…
H02K 5/1675
Using sliding-contact or spherical cap bearings: radially supporting the rotary shaft at only one end of the rotor

Family

US 7,371,010 B2Related patent
US 2006/0140521 A1This patent

From the US filing history. Foreign family members aren’t listed.

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