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Fluid dynamic bearing device and assembly method for same

A technology of fluid dynamic pressure bearings and bearing devices, which is applied in the direction of bearing assembly, sliding contact bearings, and rotating bearings. Fewer parts, improved accuracy, and excellent quietness

Inactive Publication Date: 2012-12-26
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition, in the fluid dynamic pressure bearing device, if the radial bearing clearance and the thrust bearing clearance are not set with high precision, the pressure of the lubricating oil in each bearing clearance cannot be sufficiently increased, and the inner member and the outer member may contact and slide, resulting in will make noise
In order to avoid such inconvenience, setting the clearances of each bearing with high precision requires a complicated process, which leads to a decrease in assembly workability and an increase in manufacturing cost.

Method used

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  • Fluid dynamic bearing device and assembly method for same
  • Fluid dynamic bearing device and assembly method for same
  • Fluid dynamic bearing device and assembly method for same

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no. 1 approach

[0161] The assembling method of this embodiment is also applicable to the case where the protruding portion 10 a and the sleeve portion 10 b of the inner member 10 are separate structures. The case where the protruding portion 10a and the sleeve portion 10b of the inner member 10 have a separate structure is the fluid dynamic pressure bearing device according to the first embodiment of the present invention ( figure 2 ), the fluid dynamic pressure bearing device of its modification ( Figure 7 ), and the fluid dynamic pressure bearing device of the modified example of the second embodiment ( Figure 9 ). Here, with the fluid dynamic pressure bearing device of the first embodiment ( figure 2 ) will be described below as an example, but it can be similarly applied to the fluid dynamic pressure bearing device of the other embodiment described above.

[0162] The jig B shown in FIG. 12( a ) is a first jig and has a mounting surface 30 and a bottom surface 31 recessed by a dim...

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Abstract

Providing a fluid dynamic bearing device, wherein the outer member comprises a member formed by a pressing process on a plate member, the radial bearing surface and at least the one of the thrust bearing surfaces of the outer member being formed by the pressing process, and wherein at least a part of the inner member, which forms the radial bearing surface and the thrust bearing surfaces of the inner member, is made of a sintered metal.

Description

technical field [0001] The present invention relates to a hydrodynamic bearing device in which an inner member is rotatably supported by the dynamic pressure of lubricating oil generated in a bearing gap between an inner member and an outer member. Background technique [0002] Bearings are installed in electric motors mounted on electrical equipment such as ventilating fans, and the rotating shaft is rotatably supported by the bearings. In such applications, a so-called rolling bearing is generally used in which a plurality of rolling elements are interposed between an outer ring and an inner ring, and a cage that holds the rolling elements is used (for example, Patent Document 1). [0003] On the other hand, as a fluid dynamic pressure bearing device, there is a structure including an outer member and an inner bearing plate member. The outer member is composed of a cylindrical bearing ring and bearing plates fitted to both ends of the bearing ring. The inner bearing plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/10F16C33/10F16C33/14H02K7/08
CPCF16C2360/46H02K5/1672F16C17/107H02K2213/09F16C43/02F16C33/128F16C33/107H02K2205/03F16C33/14F16C2220/04F16C2220/20F16C2226/12F16C2226/14F16C2226/40
Inventor 堀政治平出淳林达也山本康裕森夏比古里路文规丹羽稔明栗村哲弥尾藤仁彦
Owner NTN CORP