Hybrid air foil journal bearing and manufacturing method thereof

• US 20020097927A1
• Filed: 07/25/2001
• Published: 07/25/2002
• Est. Priority Date: 01/19/2001
• Status: Abandoned Application

• Current Assignee: Korea Advanced Institute of Science and Technology
• Original Assignee: Korea Advanced Institute of Science and Technology
• Inventors: Lee, Yong Bok, Kim, Tae Ho, Kim, Chang Ho, Lee, Nam Soo
• Application Number:
  US09/912,965
• Publication Number:
  US 20020097927A1
• Time in Patent Office: Days
• US Class Current: 384/103
• CPC Class Codes: F16C 17/024 with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
• CPC Class Codes: F16C 27/02 Sliding-contact bearings
• CPC Class Codes: F16C 33/14 Special methods of manufacture; Running-in
• CPC Class Codes: F16C 43/02 Assembling sliding-contact bearings

Abstract

A hybrid air foil journal bearing in accordance with the present invention, comprising an hybrid air foil journal bearing supporting a shaft by air layer formed between inner surface of the housing thereof and the shaft, wherein said bearing comprising a plurality of key slots formed on the surface of the bearing housing, which are spaced apart from each other at a certain distance, a plurality of hybrid foils formed as a body to have a high stiffness and a high resiliency supporting said shaft, which are correspondingly fixed at said key slots.

Claims

1. A hybrid air foil journal bearing supporting a shaft by air layer formed between inner surface of the housing thereof and the shaft, wherein said bearing comprising:

a plurality of key slots formed on the surface of the bearing housing, which are spaced apart from each other at a certain distance;

a plurality of hybrid air foils formed as a body to have a high stiffness and a high resiliency supporting said shaft, which are correspondingly fixed at said key slots.

2. The hybrid air foil journal bearing according to claim 1, wherein said hybrid air foil comprising:

a bump foil having said stiffness;

a multi-leaf foil having said resiliency connected with an end of the bump foil; and

a fixing unit formed at the other end of said bump foil.

3. The hybrid air foil journal bearing according to claim 2, wherein said multi-leaf foil of said hybrid air foil overlapping another multi-leaf foil of hybrid air foil by a certain area and supporting said rotating shaft together with said another multi-leaf foil of hybrid air foil.

4. The hybrid air foil journal bearing according to claim 2, wherein said multi-leaf foil increasing a reducing force by Coulomb friction generated at overlapped part between said multi-leaf foils of said hybrid air foils and at contact parts between said multi-leaf foil and said bump foil.

5. The hybrid air foil journal bearing according to claim 2, wherein said bump foil supporting said multi-leaf foil to radial direction of said shaft.

6. The hybrid air foil journal bearing according to claim 2, wherein said bump foil having a plurality of convex bodies by a certain distance therebetween and a flat part among said convex bodies.

7. The hybrid air foil journal bearing according to claim 6, wherein said convex bodies comprise half spheres or wave form bodies.

8. The hybrid air foil journal bearing according to claim 6, wherein said multi-leaf foil generating a hydrodynamic pressure by its own elastic deformation between tops of said half spheres of said bump foils when said rotating shaft is loaded highly and rotates.

9. A manufacturing method of hybrid air foil of a hybrid air foil journal bearing, wherein the method comprising the steps of:

forming a foil having a multi-leaf type and a bump type by pressing the foil with a press die mold;

forming a fixing unit at an end of the bump type foil, which shaped as corresponding to a shape of the key slot of the journal bearing housing; and

bending a part between the bump type foil and a multi-leaf type foil.

10. The manufacturing method of hybrid air foil according to claim 9, wherein said press die mold is previously manufactured as a prototype of the multi-leaf type foil and the bump type foil.

11. The manufacturing method of hybrid air foil according to claim 9, wherein said fixing unit of the hybrid air foil is fixed at the slot in the interior portion of the hybrid air foil.