Floating bearing cartridge for a turbocharger shaft
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16C-025/06
F04B-017/00
출원번호
UP-0778517
(2007-07-16)
등록번호
US-7832938
(2011-01-16)
발명자
/ 주소
McKeirnan, Jr., Robert D.
인용정보
피인용 횟수 :
12인용 특허 :
7
초록▼
An improved bearing system for use in high speed rotating machinery, such as a turbocharger, wherein a shaft is rotatably supported by a floating bearing cartridge having axially spaced angular contact bearings each with a set of bearing balls supported between inner and outer races. The bearing car
An improved bearing system for use in high speed rotating machinery, such as a turbocharger, wherein a shaft is rotatably supported by a floating bearing cartridge having axially spaced angular contact bearings each with a set of bearing balls supported between inner and outer races. The bearing cartridge includes an inner spacer sleeve for axially spacing the inner bearing races, and a rotationally floating outer sleeve having a pair of radially inwardly open grooves for removably receiving snap-type retaining rings which engage and axially space the outer bearing races. The axial dimension of the inner spacer sleeve is elongated slightly relative to an axial dimension defined between outboard faces of the installed retaining rings, thereby slightly unloading the sets of bearing balls from their respective outer bearing races. Such slight axial unloading enhances smooth-running operation with minimal bearing wear, while accommodating transient loads during operation.
대표청구항▼
What is claimed is: 1. In a turbomachine including a center housing disposed axially between a drive element and a driven element, and a shaft extending through said center housing and interconnecting said drive and driven elements, a floating bearing cartridge for rotationally supporting said shaf
What is claimed is: 1. In a turbomachine including a center housing disposed axially between a drive element and a driven element, and a shaft extending through said center housing and interconnecting said drive and driven elements, a floating bearing cartridge for rotationally supporting said shaft within said center housing, said floating bearing cartridge comprising: a pair of angular contact bearings each having an inner race for mounting onto said shaft for rotation therewith, an outer race, and a complement of bearing balls interposed between said inner and outer races; an inner spacer sleeve for axially spacing said inner races of said pair of angular contact bearings by a first predetermined dimension; and an outer spacer sleeve for mounting within said center housing, said outer space sleeve carrying a pair of opposed faces for respectively engaging said outer races of said pair of angular contact bearings, said pair of opposed faces being axially separated by a second predetermined dimension; said first predetermined dimension being at least slightly elongated relative to said second predetermined dimension, whereby said angular contact bearing are subjected to a negative pre-load when the turbomachine is in a static condition. 2. The turbomachine of claim 1 wherein said turbomachine comprises a turbocharger, and further wherein said drive element comprises a turbine wheel mounted at one end of said shaft, and said driven element comprises a compressor wheel mounted at an opposite end of said shaft. 3. The turbomachine of claim 1 wherein said center housing defines a bearing bore, said outer spacer sleeve having a size and shape for rotational floating mounting within said bearing bore. 4. The turbomachine of claim 3 wherein said outer spacer sleeve defines a pair of bearing pads disposed generally at opposite ends thereof for rotational floating support of said outer spacer sleeve within said bearing bore, and a radially recessed circumferential channel of selected axial length extending between said bearing pads, and further including an oil supply for oil flow into said channel axially between said bearing pads. 5. The turbomachine of claim 4 wherein the diametric sizes and axial lengths of said bearing pads and said circumferential channel are individually selected to achieve tunable vibration damping. 6. The turbomachine of claim 4 wherein said outer spacer sleeve further defines a radially enlarged thrust flange. 7. The turbomachine of claim 6 wherein said thrust flange has at least one axially open oil flow port formed therein. 8. The turbomachine of claim 1 wherein said outer spacer sleeve further defines a radially enlarged thrust flange. 9. The turbomachine of claim 1 wherein said inner race of each of said angular contact bearings is sized and shaped for substantially press-fit installation onto said shaft. 10. The turbomachine of claim 1 wherein each of said angular contact bearings is oriented to carry a unidirectional thrust load acting in an inboard direction during turbomachine operation. 11. The turbomachine of claim 1 wherein said outer spacer sleeve has a pair of generally annular and radially inwardly open grooves formed therein, and further including a pair of rings seated respectively within said grooves, said rings defining said pair of faces for respectively engaging said outer races of said pair of angular contact bearings. 12. The turbomachine of claim 11 wherein said pair of rings comprises a pair of snap rings. 13. The turbomachine of claim 1 wherein said outer spacer sleeve defines a pair of axially outboard presented step shoulders respectively defining said pair of faces for engaging said outer races of said pair of angular contact bearings. 14. In a turbomachine including a center housing disposed axially between a drive element and a driven element, and a shaft extending through said center housing and interconnecting said drive and driven elements, a floating bearing cartridge for rotationally supporting said shaft within said center housing, said floating bearing cartridge comprising: a pair of angular contact bearings each having an inner race for mounting onto said shaft for rotation therewith, an outer race, and a complement of bearing balls interposed between said inner and outer races; each of said angular contact bearings being oriented to carry a unidirectional thrust load acting in an inboard direction during turbomachine operation; an inner spacer sleeve for axially spacing said inner races of said pair of angular contact bearings by a first predetermined dimension; an outer spacer sleeve adapted for mounting within said center housing, said outer space sleeve having a pair of generally annular and radially inwardly open grooves formed therein; and a pair of rings seated respectively within said grooves, said rings defining a pair of opposed faces for respectively engaging said outer races of said pair of angular contact bearings, said pair of opposed faces being axially separated by a second predetermined dimension; said first predetermined dimension being at least slightly elongated relative to said second predetermined dimension, whereby said angular contact bearing are subjected to a negative pre-load when the turbomachine is in a static condition. 15. The turbomachine of claim 14 wherein said turbomachine comprises a turbocharger, and further wherein said drive element comprises a turbine wheel mounted at one end of said shaft, and said driven element comprises a compressor wheel mounted at an opposite end of said shaft. 16. The turbomachine of claim 14 wherein said center housing defines a bearing bore, said outer spacer sleeve having a size and shape for rotational mounting within said bearing bore. 17. The turbomachine of claim 14 wherein said pair of rings comprises a pair of snap rings. 18. In a turbomachine including a center housing disposed axially between a drive element and a driven element, and a shaft extending through said center housing and interconnecting said drive and driven elements, a floating bearing cartridge for rotationally supporting said shaft within said center housing, said floating bearing cartridge comprising: a pair of angular contact bearings each having an inner race for mounting onto said shaft for rotation therewith, an outer race, and a complement of bearing balls interposed between said inner and outer races; each of said angular contact bearings being oriented to carry a unidirectional thrust load acting in an inboard direction during turbomachine operation; an inner spacer sleeve for axially spacing said inner races of said pair of angular contact bearings by a first predetermined dimension; an outer spacer sleeve adapted for mounting within said center housing, said outer space sleeve having a pair of axially outboard presented step shoulders respectively defining a pair of opposed faces for engaging said outer races of said pair of angular contact bearings, said pair of opposed faces being axially separated by a second predetermined dimension; said first predetermined dimension being at least slightly elongated relative to said second predetermined dimension, whereby said angular contact bearing are subjected to a negative pre-load when the turbomachine is in a static condition. 19. The turbomachine of claim 18 wherein said turbomachine comprises a turbocharger, and further wherein said drive element comprises a turbine wheel mounted at one end of said shaft, and said driven element comprises a compressor wheel mounted at an opposite end of said shaft. 20. The turbomachine of claim 18 wherein said center housing defines a bearing bore, said outer spacer sleeve having a size and shape for rotational mounting within said bearing bore.
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이 특허에 인용된 특허 (7)
Wollenweber, William E., Bearing system for high-speed rotating machinery.
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