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Sintered bearing, fluid dynamic bearing device and motor comprising same, and sintered bearing manufacturing method

A technology of sintered bearings and sintered bodies, which is applied in the direction of bearings, shafts, bearings, bearing components, etc., can solve the problems of sintered bearing damage, durability reduction, and inability to obtain the rotation accuracy of shaft parts, etc., and achieve the goal of improving bearing rigidity and pressure Effect

Inactive Publication Date: 2016-11-09
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When air bubbles are generated in the lubricating oil in the bearing device, especially in the oil film of the radial bearing gap, the pressure of the oil film decreases, so that not only cannot the sufficient rotational accuracy of the shaft parts be obtained, but also the inner peripheral surface of the sintered bearing due to the contact with the shaft parts The outer peripheral surface may be damaged due to contact, and the durability may decrease

Method used

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  • Sintered bearing, fluid dynamic bearing device and motor comprising same, and sintered bearing manufacturing method
  • Sintered bearing, fluid dynamic bearing device and motor comprising same, and sintered bearing manufacturing method
  • Sintered bearing, fluid dynamic bearing device and motor comprising same, and sintered bearing manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0071] In order to confirm the effect of the present invention, an implementation product and a comparison product were produced. In the implementation product, the image 3 In the sintered bearings such as the dynamic pressure grooves 8a11 shown, six axial grooves are formed on the outer peripheral surface at equal intervals in the circumferential direction, and in the comparative product, three axial grooves are formed on the outer peripheral surface at equal intervals in the circumferential direction . In these implementation products and comparative products, variations in the groove depths of the dynamic pressure grooves on the same circumference were measured. Specifically, the predetermined axial positions (for example, image 3 According to the roundness waveform of the inner peripheral surface of the IV-IV line), the difference in the radial position of the groove bottom of each dynamic pressure groove relative to the axial center of the sintered bearing is calculate...

Embodiment 2

[0073] In addition, in the comparative product described above, variation in the groove depth of the dynamic pressure grooves was measured when the groove depths of the axial grooves were varied. The result is as Figure 13 As shown, the deeper the groove depth of the axial groove, the greater the deviation of the groove depth of the dynamic pressure groove, especially when the groove depth of the axial groove exceeds 20% of the radial wall thickness of the sintered bearing, the dynamic pressure groove The deviation of the groove depth increases sharply. From this, it can be seen that the groove depth of the axial groove is preferably 20% or less of the radial thickness of the sintered bearing.

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Abstract

This sintered bearing (8) has a plurality of axial grooves (8c1) arranged on an outer circumferential face (8c) at regular intervals in the circumferential direction and also has a plurality of dynamic pressure grooves (8a11) and the like arranged on the inner circumferential face (8a) at regular intervals in the circumferential direction. In this sintered bearing (8), the number of axial grooves (8c1) is an integer multiple of the number of dynamic pressure grooves (8a11) and the like that are on the same circumference.

Description

technical field [0001] The present invention relates to a sintered bearing, a fluid dynamic pressure bearing device and a motor having the sintered bearing, and a method for manufacturing the sintered bearing. Background technique [0002] The hydrodynamic bearing device supports the shaft member freely relative to each other without contact by the pressure generated by the fluid film (for example, oil film) in the radial bearing gap between the outer peripheral surface of the shaft member and the inner peripheral surface of the bearing member. Due to its high rotational accuracy and quietness, the hydrodynamic bearing device is suitable for use as information equipment (such as disk drives such as HDDs, optical disk drives such as CD-ROM, CD-R / RW, DVD-ROM / RAM, and Blu-ray Discs) , MD, MO and other optical disk drives) spindle motors, polygon scanning mirror motors for laser printers (LBP), color rings for projectors, or fan motors for cooling fans of electrical equipment, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/10B22F3/24B22F5/00F16C33/12F16C33/14H02K7/08
CPCF16C33/107B22F5/10B22F2005/103F16C2370/12F16C17/107F16C33/1085F16C33/128F16C33/145F16C33/1065B22F3/16B22F3/24B22F5/106B22F2003/245F16C17/026F16C2220/20G11B19/2036H02K7/08
Inventor 原田和庆栗村哲弥
Owner NTN CORP
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