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Foil bearing device

A technology of foil bearings and foil strips, applied to bearings, shafts and bearings, sliding contact bearings, etc., can solve the problems of bearing dysfunction, increased friction resistance of bearing parts, damage to rotating shaft 51, etc., and achieve good assembly workability , Good replacement workability and low replacement cost

Inactive Publication Date: 2010-08-04
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the inner peripheral side 52a of the foil tape 52 displaces in the axial direction and jumps out, it may hinder the function as a normal bearing, causing various problems (frictional resistance of the bearing portion increases, rotation shaft 51 damage, etc.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0028] figure 2 and image 3 Representing the first embodiment of the present invention, figure 2 is a sectional view of the foil bearing device, image 3 Yes figure 2 A-A line sectional view.

[0029] like figure 2 and image 3 As shown, the foil bearing device 1A includes a rotating shaft 2 that is rotated at a high speed by a drive mechanism (not shown), a bearing inner ring 3 press-fitted into the outer circumference of the rotating shaft 2 , and a foil strip 4 arranged on the outer circumference of the bearing inner ring 3 . , and a bearing outer ring 5 arranged on the outer circumference of the foil strip 4 .

[0030] The bearing inner ring 3 has an outer peripheral surface 3a on which the inner peripheral side 4a of the foil strip 4 abuts, and a pair of foil strip displacement restricting portions 6 and 7 protruding from the outer peripheral surface 3a to the outer peripheral side.

[0031] The width dimension between the pair of foil tape displacement restrictin...

no. 2 approach

[0040] Figure 4 It is a cross-sectional view of a foil bearing device according to a second embodiment of the present invention.

[0041] like Figure 4 As shown, the foil bearing device 1B includes a rotating shaft 10 that is rotated at a high speed by a drive mechanism (not shown), a bearing inner ring 11 press-fitted into the outer circumference of the rotating shaft 10 , and a foil strip 4 arranged on the outer circumference of the bearing inner ring 11 . , and a bearing outer ring 5 arranged on the outer circumference of the foil strip 4 .

[0042] The rotary shaft 10 is formed as a step shaft composed of a small diameter portion 10a and a large diameter portion 10b. A stepped surface 10c is formed on the boundary between the small diameter portion 10a and the large diameter portion 10b.

[0043] The bearing inner ring 11 is press-fitted into the small diameter portion 10 a of the rotary shaft 10 . The bearing inner ring 11 has an outer peripheral surface 11a against...

no. 3 approach

[0052] Figure 5 It is a cross-sectional view of a foil bearing device according to a third embodiment of the present invention.

[0053] like Figure 5 As shown, the foil bearing device 1C includes a rotating shaft 20 that is rotated at high speed by a drive mechanism (not shown), a foil 4 arranged on the outer circumference of the rotating shaft 20 , and a bearing outer ring 5 provided on the outer circumference of the foil 4 . .

[0054] The rotating shaft 20 is formed as a grooved shaft composed of a small diameter portion 20a and a large diameter portion 20b. Step surfaces 20c and 20c are formed on the boundary between the small diameter portion 20a and the large diameter portion 20b, respectively.

[0055] The foil strip 4 is arranged on the outer periphery of the small diameter portion 20 a of the rotating shaft 20 . In this way, the large-diameter portions 20b and 20b of the rotating shaft 20 are arranged on the outer sides of both ends of the foil tape 4, respecti...

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PUM

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Abstract

A foil bearing device comprises a rotary shaft (2), a bearing inner ring (3) press-fitted to the outer periphery of the rotary shaft (2), a foil (4) disposed on the outer periphery of the bearing inner ring (3), and a bearing outer ring (5) provided on the outer periphery of the foil (4). Furthermore, the bearing inner ring (3) is provided with a pair of foil displacement restricting parts (6, 7) for restricting the axial displacement of the inner peripheral side (4a) of the foil (4).

Description

technical field [0001] The present invention relates to a foil bearing device comprising a thin-plate foil arranged on the outer circumference of a rotating shaft and a bearing outer ring arranged on the outer circumference of the foil, by forming air between the rotating shaft and the foil. layer without oil to support the rotating shaft so that it can rotate freely. Background technique [0002] This foil bearing device is a bearing device suitable for use in turbo compressors, turbochargers, gas turbines, and the like because it is not necessary to supply oil and can support a rotating shaft that rotates at a high speed. [0003] As shown in FIG. 1 , a conventional foil bearing device 50 includes a rotating shaft 51 , a foil 52 wound around the outer circumference of the rotating shaft 51 in multiple layers, and a bearing outer ring 53 provided on the outer circumference of the foil 52 . A pair of stoppers 54 and 54 are provided at both ends of the bearing outer ring 53 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C27/02
CPCF16C17/02F16C17/024F16C2360/24
Inventor 石本兴史
Owner IHI CORP
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