IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0441811
(2012-04-06)
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등록번호 |
US-8602653
(2013-12-10)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Mohawk Innovative Technology, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
29 |
초록
▼
A foil thrust bearing applicable to high speed machining and grinding machines for machining microscopic features. Top foil segments are circumferentially spaced relative to a rotating runner for engagement by the runner when the bearing is mounted to bearingly support runner rotation. Bump foil seg
A foil thrust bearing applicable to high speed machining and grinding machines for machining microscopic features. Top foil segments are circumferentially spaced relative to a rotating runner for engagement by the runner when the bearing is mounted to bearingly support runner rotation. Bump foil segments underlie and support and engage the top foil segments respectively. A thrust plate supports and engages the bump foil segments. Each top foil segment and each bump foil segment is secured only along an edge portion which is trailing relative to the runner rotation leaving an edge which is leading relative to runner rotation and a pair of side edges unsecured. Each bump foil segment includes tabs separated by slots extending from the leading edge at least partially to the secured edge portion. Each bump foil tab has substantially parallel ridges separated by flats.
대표청구항
▼
1. A foil thrust bearing comprising a plurality of generally planar top foils overlying a like number of coextensive bump foils, supported by a generally disc-like thrust plate with a center and a circumference; the top foils being substantially equally-spaced apart with gaps therebetween and at a s
1. A foil thrust bearing comprising a plurality of generally planar top foils overlying a like number of coextensive bump foils, supported by a generally disc-like thrust plate with a center and a circumference; the top foils being substantially equally-spaced apart with gaps therebetween and at a substantially equal radial distance from the center of the thrust plate;the top foils having the form of an annular arc, and being bounded on an outer edge by the circumference of an outer circle and on an inner edge by the circumference of an inner circle, both circles being centered on the thrust plate center;the top foils being further bounded by a free end and a secured end, each of the free and secured ends encompassing a portion of a radial line passing through the thrust plate center;the bump foils similarly having an inner edge, an outer edge, a free end and a secured end;the bump foils further comprising a plurality of circumferentially oriented, spaced apart tabs and separated by slots extending from the free end of the bump foil a portion of the distance to the secured end;the bump foil tabs comprising a plurality of substantially parallel ridges separated by flats, the ridges and flats being oriented generally parallel to the secured edge;each of the ridges having a peak with a height and each of the flats having a centerline oriented generally parallel to the ridges; andthe top foils and the bump foils being secured to the thrust plate at their respective secured ends,wherein the bearing is split along a line passing through the center of the thrust plate and through gaps between adjacent thrust foils to form a first thrust plate portion with a first edge comprising some number of the bump and top foils of the bearing and a second thrust plate portion with a second edge comprising the remainder of the bump and top foils of the bearing. 2. The foil thrust bearing of claim 1, wherein the abutting first and second edges of the first and second thrust plate portions comprise mating alignment features. 3. The foil thrust bearing as set forth in claim 1, wherein the peaks of the plurality of ridges is generally collinear with the centerline of the flats in adjacent tabs. 4. The foil thrust bearing as set forth in claim 1, wherein the top foil is coated with a hard lubricious coating. 5. The foil thrust bearing as set forth in claim 1, in which the thrust plate further comprises at least a shaped slot and the secured end of at least one of the plurality of bump foils comprises a feature of complementary shape to the shaped slot which engages the shaped slot to secure the bump foil to the thrust plate. 6. The foil thrust bearing as set forth in claim 1, in which the secured end of at least one of the plurality of bump foils is planar and the secured end of the bump foil is secured to the thrust plate by welding. 7. The foil thrust bearing as set forth in claim 1 wherein each of the flats is offset from the flats in each adjacent one of said tabs. 8. The foil thrust bearing as set forth in claim 1 wherein the thrust plate further comprises a plurality of circumferential openings for radial ingress of gas, the openings being located on a circle with a radius greater than the radius of the outer circle. 9. A foil thrust bearing comprising a plurality of generally planar top foils overlying a like number of coextensive bump foils, supported by a generally disc-like thrust plate with a center and a circumference; the top foils being substantially equally-spaced apart with gaps therebetween and at a substantially equal radial distance from the center of the thrust plate;the top foils having the form of an annular arc, and being bounded on an outer edge by the circumference of an outer circle and on an inner edge by the circumference of an inner circle, both circles being centered on the thrust plate center;the top foils being further bounded by a free end and a secured end, each of the free and secured ends encompassing a portion of a radial line passing through the thrust plate center;the bump foils similarly having an inner edge, an outer edge, a free end and a secured end;the bump foils further comprising a plurality of circumferentially oriented, spaced apart tabs and separated by slots extending from the free end of the bump foil a portion of the distance to the secured end;the bump foil tabs comprising a plurality of substantially parallel ridges separated by flats, the ridges and flats being oriented generally parallel to the secured edge;each of the ridges having a peak with a height and each of the flats having a centerline oriented generally parallel to the ridges; andthe top foils and the bump foils being secured to the thrust plate at their respective secured ends,wherein the thrust plate further comprises a plurality of circumferential openings for radial ingress of gas, the openings being located on a circle with a radius greater than the radius of the outer circle. 10. The foil thrust bearing as set forth in claim 9, wherein the openings are located in the gaps between the top foils. 11. The foil thrust bearing as set forth in claim 9 wherein each of the flats is offset from the flats in each adjacent one of said tabs. 12. A foil thrust bearing comprising a top foil sheet comprising a plurality of generally planar top foils overlying a bump foil sheet comprising a like number of bump foils, the top foils overlying and being coextensive with the bump foils, the top foil sheet and the bump foil sheet being supported by and secured to a generally disc-like thrust plate with a center and a circumference, the center of the top foil sheet and the center of the bump foil sheet being coincident with the thrustplate center; the top foils being substantially equally-spaced apart with gaps therebetween and at a substantially equal radial distance from the center of the thrust plate;the top foils having the form of an annular arc, separated from the top foil sheet on three edges and being bounded on an outer edge by the circumference of an outer circle and on an inner edge by the circumference of an inner circle, both circles being centered on the thrust plate center;the top foils being further bounded by a free end and a secured end, each of the free and secured ends encompassing a Portion of a radial line passing through the thrust plate center, the secured end being continuous with the top foil sheet;the bump foils similarly having an inner edge, an outer edge, a free end and a secured end wherein the secured end of the bump foil is continuous with the bump foil sheet;the bump foils further comprising a plurality of circumferentially oriented, spaced apart tabs and separated by slots extending from the free end of the bump foil a portion of the distance to the secured end;each of the bump foil tabs comprising a plurality of substantially parallel ridges separated by flats, the ridges and flats being oriented generally parallel to the secured edge;each of the ridges having a peak with a height and each of the flats having a centerline oriented generally parallel to the ridges,wherein the thrust plate is split along a line passing through the center of the thrust plate. 13. The foil thrust bearing as set forth in claim 12 wherein the peaks of the plurality of ridges are generally collinear with the centerline of the flats in adjacent tabs. 14. The foil thrust bearing as set forth in claim 12 wherein the top foil is coated with a hard lubricious coating. 15. A foil thrust bearing comprising a top foil sheet comprising a plurality of generally planar top foils overlying a bump foil sheet comprising a like number of bump foils, the top foils overlying and being coextensive with the bump foils, the top foil sheet and the bump foil sheet being supported by and secured to a generally disc-like thrust plate with a center and a circumference, the center of the top foil sheet and the center of the bump foil sheet being coincident with the thrustplate center; the top foils being substantially equally-spaced apart with gaps therebetween and at a substantially equal radial distance from the center of the thrust plate;the top foils having the form of an annular arc, separated from the top foil sheet on three edges and being bounded on an outer edge by the circumference of an outer circle and on an inner edge by the circumference of an inner circle, both circles being centered on the thrust plate center;the top foils being further bounded by a free end and a secured end, each of the free and secured ends encompassing a Portion of a radial line passing through the thrust plate center, the secured end being continuous with the top foil sheet;the bump foils similarly having an inner edge, an outer edge, a free end and a secured end wherein the secured end of the bump foil is continuous with the bump foil sheet;the bump foils further comprising a plurality of circumferentially oriented, spaced apart tabs and separated by slots extending from the free end of the bump foil a portion of the distance to the secured end;each of the bump foil tabs comprising a plurality of substantially parallel ridges separated by flats, the ridges and flats being oriented generally parallel to the secured edge;each of the ridges having a peak with a height and each of the flats having a centerline oriented generally parallel to the ridges,wherein the bearing is split along a line passing through the center of the thrust plate and through gaps between adjacent thrust foils to form a first thrust plate portion with a first edge comprising some number of the bump and top foils of the bearing and a second thrust plate portion with a second edge comprising the remainder of the bump and top foils of the bearing. 16. The foil thrust bearing of claim 15 wherein the abutting first and second edges of the first and second thrust plate portions comprise mating alignment features. 17. A foil thrust bearing comprising a top foil sheet comprising a plurality of generally planar top foils overlying a bump foil sheet comprising a like number of bump foils, the top foils overlying and being coextensive with the bump foils, the top foil sheet and the bump foil sheet being supported by and secured to a generally disc-like thrust plate with a center and a circumference, the center of the top foil sheet and the center of the bump foil sheet being coincident with the thrustplate center; the top foils being substantially equally-spaced apart with gaps therebetween and at a substantially equal radial distance from the center of the thrust plate;the top foils having the form of an annular arc, separated from the top foil sheet on three edges and being bounded on an outer edge by the circumference of an outer circle and on an inner edge by the circumference of an inner circle, both circles being centered on the thrust plate center;the top foils being further bounded by a free end and a secured end, each of the free and secured ends encompassing a Portion of a radial line passing through the thrust plate center, the secured end being continuous with the top foil sheet;the bump foils similarly having an inner edge, an outer edge, a free end and a secured end wherein the secured end of the bump foil is continuous with the bump foil sheet;the bump foils further comprising a plurality of circumferentially oriented, spaced apart tabs and separated by slots extending from the free end of the bump foil a portion of the distance to the secured end;each of the bump foil tabs comprising a plurality of substantially parallel ridges separated by flats, the ridges and flats being oriented generally parallel to the secured edge;each of the ridges having a peak with a height and each of the flats having a centerline oriented generally parallel to the ridges,wherein the thrust plate, top foil sheet and bump foil sheet further comprise aligned openings located outboard of the outer circle for radial ingress of gas. 18. The foil thrust bearing as set forth in claim 17 wherein the openings are located in the gaps between the top foils. 19. The foil thrust bearing as set forth in claim 17 wherein each of the flats is offset from the flats in each adjacent one of said tabs.
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