Back to results
US 6,672,767 B2Granted
Dynamic bearing device and motor having the same
AssigneesNidec Corporation, Ntn Corporation
InventorsKimihiko Hajota, Hironori Itsusaki, Tsugito Nakazeki, Natsuhiko Mori
Life of this patent
Estimating the term…
Abstract
In the dynamic bearing device, a chamfer having a larger percentage of surface openings is continuous to the outer diameter side of a lower end surface of a bearing member, which constitutes a thrust bearing gap of a first thrust bearing part. A lubricating oil in pores of the bearing member is supplied to a gap portion through the surface openings of the chamfer, so that the gap portion can be kept at a positive pressure without becoming a negative pressure.
Claims7
A dynamic bearing device comprising:
- a housing having an end with an opening and another end with a bottom part;
- a shaft member having an axial part and a flange part to be housed in the housing;
- a cylindrical bearing member to be housed in the housing, constituted by a porous body made of a sintered metal;
- at least one radial bearing part provided between an inner peripheral surface of the bearing member and an outer peripheral surface of the axial part, which support the axial part in the radial direction in a non-contact manner by means of a dynamic pressure action of a lubricating oil to be caused in a radial bearing gap;
- thrust bearing parts provided between both surfaces of the flange part and an end surface of the bearing member and the bottom part of the housing, which support the flange part in the thrust directions in a non-contact manner by means of a dynamic pressure action of a lubricating oil to be caused in thrust bearing gaps;
- and
- a sealing member arranged in the opening of the housing,
- wherein an inner space of the housing including pores of the bearing member is filled with a lubricating oil, and
- wherein the bearing member comprises an area at the outer diameter side of an end surface area of the bearing member which constitutes the thrust bearing gap, the area having a percentage of surface openings of the pores larger than that of the end surface area.
6 more elements
Dependencies are inferred from the claim text.