The radial foil bearing includes: a top foil; an intermediate foil; a back foil; and a bearing housing accommodating the top foil, the intermediate foil and the back foil. The top foil is formed by winding a rectangular metal foil which includes a first uneven portion and a second uneven portion, in
The radial foil bearing includes: a top foil; an intermediate foil; a back foil; and a bearing housing accommodating the top foil, the intermediate foil and the back foil. The top foil is formed by winding a rectangular metal foil which includes a first uneven portion and a second uneven portion, into a cylindrical shape so as to overlap the first and second uneven portions with each other, wherein the first uneven portion is composed of a projecting portion and a depressed portion formed on one edge of the metal foil, and the second uneven portion is composed of a depressed portion, and a projecting portion formed on another edge of the metal foil. The projecting portions of the first and second uneven portions pulled out near the bearing housing engage with engagement grooves of the hearing housing.
대표청구항▼
1. A radial foil bearing used for supporting a rotary shaft so as to encircle the rotary shaft, the radial foil bearing comprising: a cylindrical top foil disposed so as to face the rotary shaft;an intermediate foil disposed outside of the top foil in a radial direction thereof;a back foil disposed
1. A radial foil bearing used for supporting a rotary shaft so as to encircle the rotary shaft, the radial foil bearing comprising: a cylindrical top foil disposed so as to face the rotary shaft;an intermediate foil disposed outside of the top foil in a radial direction thereof;a back foil disposed outside of the intermediate foil in the radial direction; anda cylindrical bearing housing accommodating the top foil, the intermediate foil and the back foil,wherein engagement grooves are formed on an inner circumferential surface of the bearing housing in an axial direction thereof,the top foil is formed by winding a rectangular metal foil which includes a first uneven portion and a second uneven portion, into a cylindrical shape so as to overlap the first and second uneven portions with each other, the first uneven portion being composed of a projecting portion and a depressed portion formed on one edge of the metal foil, the second uneven portion being composed of a depressed portion and a projecting portion formed on another edge of the metal foil opposite to the one edge,the projecting portion of the first uneven portion is disposed so as to be pulled out near the bearing housing through the depressed portion of the second uneven portion,the projecting portion of the second uneven portion is disposed so as to be pulled out near the bearing housing through the depressed portion of the first uneven portion, andthe projecting portions of the first and second uneven portions pulled out near the bearing housing engage with the engagement grooves. 2. The radial foil bearing according to claim 1, wherein the intermediate foil has a multi-layered structure including foils overlapping with each other. 3. The radial foil bearing according to claim 1, wherein the intermediate foil is formed of a rectangular metal foil including an uneven portion which is composed of a projecting portion and a depressed portion formed on at least one edge of the metal foil, and the projecting portion of the uneven portion engages with one of the engagement grooves. 4. The radial foil bearing according to claim 1, wherein a through groove is formed on the inner circumferential surface of the bearing housing, the through groove being continuous from one end to another end in the axial direction of the bearing housing, a fixing member is fitted into the through groove, the fixing member dividing the through groove in a length direction thereof, thereby forming the engagement grooves, anda restriction portion is provided in the through groove and the fixing member, the restriction portion restricting movement of the fixing member in the length direction of the through groove. 5. The radial foil bearing according to claim 4, wherein a locking recess is formed on an inner side surface of the through groove in the length direction of the through groove, the locking recess allowing a tip portion of the projecting portion of the top foil to be locked therein. 6. The radial foil bearing according to claim 4, wherein the restriction portion includes locking grooves and bent pieces, the locking grooves being formed on both side surfaces of the bearing housing in a thickness direction of the bearing housing so as to communicate with both end portions of the through groove, the bent pieces being formed at both end portions of the fixing member so as to be locked into the locking grooves. 7. The radial foil bearing according to claim 4, wherein thin portions are formed on the one edge and on the other edge of the top foil, the thin portions being thinner than an intermediate portion therebetween. 8. The radial foil bearing according to claim 7, wherein surfaces of the thin portions, which are opposite to surfaces thereof facing the rotary shaft, are formed so as to be depressed from a surface of the intermediate portion, which is opposite to a surface thereof facing the rotary shaft. 9. The radial foil bearing according to claim 1, wherein thin portions are formed on the one edge and on the other edge of the top foil, the thin portions being thinner than an intermediate portion therebetween. 10. The radial foil bearing according to claim 9, wherein surfaces of the thin portions, which are opposite to surfaces thereof facing the rotary shaft, are formed so as to be depressed from a surface of the intermediate portion, which is opposite to a surface thereof facing the rotary shaft.
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이 특허에 인용된 특허 (11)
Licht Lazar (San Mateo CA), Adjustable clearance foil journal bearing and method of manufacturing foil element therefor.
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