Fastening arrangement for an impeller on a shaft
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-029/20
F04D-029/18
출원번호
US-0512581
(2003-05-05)
등록번호
US-7374402
(2008-05-20)
우선권정보
CH-0808/02(2002-05-06)
국제출원번호
PCT/CH03/000287
(2003-05-05)
§371/§102 date
20050526
(20050526)
국제공개번호
WO03/093651
(2003-11-13)
발명자
/ 주소
Thiele,Martin
K��hnel,Janpeter
B��ttig,Josef
출원인 / 주소
ABB Turbo Systems AG
대리인 / 주소
Buchanan Ingersoll & Rooney PC
인용정보
피인용 횟수 :
7인용 특허 :
3
초록▼
The fastening arrangement (26) for an impeller (22) on a shaft (14), in particular for an impeller (22) of a turbocharger on a turbocharger shaft (14), comprises a bush (34), which can be screwed onto a shaft journal (20) of the shaft (14), and a shaft-side hub extension (30) of the impeller (22) ha
The fastening arrangement (26) for an impeller (22) on a shaft (14), in particular for an impeller (22) of a turbocharger on a turbocharger shaft (14), comprises a bush (34), which can be screwed onto a shaft journal (20) of the shaft (14), and a shaft-side hub extension (30) of the impeller (22) having a central recess (32), into which the bush (34) can be inserted in a frictional manner. The hub extension (30), at least in the region of its shaft-side end, is designed approximately in the form of a hollow cylinder. The fastening arrangement (26) also comprises a press sleeve (36) which can be frictionally connected radially on the outside to the hub extension (30).
대표청구항▼
The invention claimed is: 1. A fastening arrangement for an impeller on a shaft, in particular for an impeller of a turbocharger on a turbocharger shaft, comprising a bush, which can be screwed onto a shaft journal of the shaft, and a shaft-side hub extension of the impeller having a central recess
The invention claimed is: 1. A fastening arrangement for an impeller on a shaft, in particular for an impeller of a turbocharger on a turbocharger shaft, comprising a bush, which can be screwed onto a shaft journal of the shaft, and a shaft-side hub extension of the impeller having a central recess, into which the bush can be inserted in a frictional manner, the hub extension, at least in the region of its shaft-side end, being designed in the form of an approximately cylindrical hollow body, wherein a press sleeve frictionally connected to the hub extension is provided radially on the outside on the hub extension, and in that the hub extension is clamped in place frictionally between bush and press sleeve. 2. The fastening arrangement as claimed in claim 1, wherein an auxiliary bearing is provided which is arranged axially between a bearing element supporting the shaft and the hub extension and in the fitted state preferably bears against part of the bush or part of the press sleeve. 3. The fastening arrangement as claimed in claim 1, wherein the impeller, in the fitted state, is separated on the shaft side from the bearing space by means of a fixed intermediate wall, and the intermediate wall engages on the shaft side radially behind the hub extension together with bush and press sleeve. 4. The fastening arrangement as claimed in claim 3, wherein a seal, preferably a labyrinth seal, is provided between press sleeve and intermediate wall and/or between bush and intermediate wall. 5. The fastening arrangement as claimed in claim 4, wherein those sides of press sleeve and/or bush which are adjacent to the intermediate wall are designed at least partly as the one part of a labyrinth seal, and wherein a side of the intermediate wall which faces the shaft journal is designed at least partly as the other part of the labyrinth seal. 6. The fastening arrangement as claimed in one of the claim 1, wherein one or more centering surfaces are provided on the outer circumference of the shaft journal, these centering surfaces interacting in a centering manner with one or more centering surfaces on the inner circumference of the bush, and wherein one or more threads are arranged on the outer circumference of the shaft journal and the inner circumference of the bush axially adjacent to the centering surfaces, these threads interacting in a positive-locking manner, the axial extent of the thread(s) corresponding approximately to one third to two thirds of the radially inner axial extent of the bush. 7. The fastening arrangement as claimed in claim 1, wherein the bush has sections having a different inside diameter axially one behind the other, the inside diameters decreasing toward the impeller, and an internal thread for screwing onto the shaft journal, which is of diametrically opposed design, is arranged on a section having a large diameter. 8. The fastening arrangement as claimed in claim 1, wherein the bush has an axially extending bush sleeve and an annular flange projecting radially outward, the flange, in the fitted state, bearing against the shaft-side end face of the hub extension and preferably having an outside diameter which corresponds approximately to the outside diameter of the hub extension. 9. The fastening arrangement as claimed in claim 1, wherein the press sleeve has an axially extending sleeve part and an annular flange projecting radially inward, the annular flange, in the fitted state, bearing against the shaft-side end face of the hub extension and preferably having an inside diameter which corresponds approximately to the inside diameter of the central recess in the hub extension. 10. The fastening arrangement as claimed in claim 8, wherein the annular flange of the press sleeve and the annular flange of the bush touch one another radially in the fitted state or are designed with shoulders in such a way that they engage radially one inside the other in a positive-locking manner, or wherein only the press sleeve or only the bush has a flange and this flange preferably extends radially in such a way that it engages behind the bush sleeve of the bush or the sleeve part of the press sleeve. 11. A turbocharger having an impeller, the impeller being formed of a first material and being mounted on a turbocharger shaft by means of a bush that is an interference fit in the impeller, the bush comprising a second material, and a press sleeve comprising a material capable of thermal shrinkage fitting against the first material, the press sleeve surrounding at least a part of an axial length of the impeller that overlies the bush, thereby to maintain the interference between the bush and the impeller during use of the turbocharger over its operating speed and temperature range. 12. The turbocharger according to claim 11, wherein the press sleeve extends over at least most of the length of an interface connection between the bush and the impeller. 13. The turbocharger according to claim 11, wherein an abutment is provided on the bush to prevent axial movement of the press sleeve on a hub of the impeller. 14. The turbocharger according to claim 11, wherein the press sleeve is provided with a circumferential land in its outer surface and matched to a labyrinth seal to cooperate with static structure of the turbocharger. 15. The turbocharger according to claim 14, wherein a labyrinth seal on an intermediate wall cooperates with the land to define a groove. 16. The turbocharger according to claim 15, wherein the labyrinth seal serves to prevent axial movement of the press sleeve. 17. An impeller for a turbocharger, comprising a hub of a first material and a bush that is an interference fit in the hub for receipt of a shaft of the turbocharger, the bush comprising a second material, the hub having mounted thereon a press sleeve of a material capable of thermal shrinkage fitting against the first material, the press sleeve surrounding at least a part of an axial length of the impeller that overlies the bush, thereby to maintain the interference between the bush and the impeller during use of the turbocharger over its operating speed and temperature range. 18. The impeller according to claim 17, wherein the press sleeve extends over at least most of the length of an interface connection between the bush and the impeller. 19. The impeller according to claim 17, wherein an abutment is provided on the bush to prevent axial movement of the press sleeve on the impeller hub. 20. The impeller according to claim 17, wherein the press sleeve is provided with a circumferential land in its outer surface matched to a labyrinth seal to cooperate with static structure of the turbocharger. 21. The impeller according to claim 20, wherein a labyrinth seal on an intermediate wall cooperates with the land to define a groove. 22. The impeller according to claim 21, wherein the labyrinth seal provides an abutment to prevent axial movement of the press sleeve.
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이 특허에 인용된 특허 (3)
Hyll John (Sandy UT), Drive shaft, drive assembly and related method.
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