IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0786637
(2007-04-12)
|
등록번호 |
US-7648279
(2010-02-22)
|
발명자
/ 주소 |
- Struziak, Ronald M.
- McAuliffe, Christopher
- Stark, Jeffery L.
|
출원인 / 주소 |
- Hamilton Sundstrand Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
21 인용 특허 :
8 |
초록
▼
A hydrodynamic fluid film journal bearing assembly includes a journal sleeve having a key slot formed therein in a substantially longitudinal direction, a bump foil wrapped in a substantially cylindrical shape adjacent to the journal sleeve and having a bent end portion engaged with the key slot, an
A hydrodynamic fluid film journal bearing assembly includes a journal sleeve having a key slot formed therein in a substantially longitudinal direction, a bump foil wrapped in a substantially cylindrical shape adjacent to the journal sleeve and having a bent end portion engaged with the key slot, an intermediate foil wrapped in a substantially cylindrical shape adjacent to the bump foil, a top foil wrapped in a substantially cylindrical shape adjacent to the intermediate foil, a first top foil cutout window formed adjacent to the bent region, and a first end tab formed at a free end of the top foil. The first end tab is wrapped with the top foil in the substantially cylindrical shape of the top foil, and extends into the first top foil cutout window to reduce skewing. The top and intermediate foils are joined at a bent region that engages the key slot.
대표청구항
▼
What is claimed is: 1. A hydrodynamic fluid film journal bearing assembly comprising: a journal sleeve having a key slot formed therein in a substantially longitudinal direction and an inner diameter surface; a bump foil wrapped in a substantially cylindrical shape adjacent to the journal sleeve, w
What is claimed is: 1. A hydrodynamic fluid film journal bearing assembly comprising: a journal sleeve having a key slot formed therein in a substantially longitudinal direction and an inner diameter surface; a bump foil wrapped in a substantially cylindrical shape adjacent to the journal sleeve, wherein the bump foil has a bent end portion engaged with the key slot; an intermediate foil wrapped in a substantially cylindrical shape adjacent to the bump foil; a top foil wrapped in a substantially cylindrical shape adjacent to the intermediate foil, wherein the top foil and the intermediate foil are joined at a bent region that engages the key slot; a first top foil cutout window formed in the top foil adjacent to the bent region; and a first end tab formed at a free end of the top foil, wherein the first end tab is wrapped with the top foil in the substantially cylindrical shape of the top foil and extends into the first top foil cutout window to reduce skewing of the top foil. 2. The assembly of claim 1 and further comprising: a first bump foil cutout window formed in the bump foil adjacent to the bend end portion, wherein the first end tab extends into the first bump foil cutout window such that the first end tab can contact the inner diameter surface of the journal sleeve. 3. The assembly of claim 1 and further comprising: a second end tab formed at the free end of the top foil, wherein the second end tab is positioned at an opposite side edge of the top foil from the first end tab; and a second top foil cutout window formed in the top foil adjacent to the key slot, wherein the second end tab extends into the second top foil cutout window to reduce skewing of the top foil. 4. The assembly of claim 3 and further comprising: a second bump foil cutout window formed in the bump foil adjacent to the bent end portion, wherein the second end tab extends into the second bump foil cutout window such that the second end tab can contact the inner diameter surface of the journal sleeve. 5. The assembly of claim 3, wherein the first end tab has a first longitudinal dimension and the second end tab has a second longitudinal dimension that is different from the first longitudinal dimension for assembly foolproofing. 6. The assembly of claim 1, wherein the first top foil cutout window has a smaller dimension than the first end tab in a generally circumferential direction. 7. The assembly of claim 1, wherein the key slot is defined through an entire thickness of the journal sleeve from the inner diameter surface to an opposite outer diameter surface. 8. The assembly of claim 1, wherein the key slot is longitudinally offset with respect to a longitudinal length of the journal sleeve. 9. The assembly of claim 1, wherein the key slot is elongate and substantially rectangular in shape. 10. The assembly of claim 1, wherein the intermediate foil and the top foil are formed from a single integral sheet. 11. A hydrodynamic fluid film journal bearing assembly comprising: a journal sleeve having an inner diameter surface and an opposite outer diameter surface; a key slot formed in the journal sleeve, wherein the key slot extends between the inner diameter surface and the opposite outer diameter surface of the journal sleeve, and wherein the key slot has an elongate rectangular shape that is arranged in a substantially axial direction with respect to an axis defined by the journal sleeve; and a first foil projecting into the key slot such that the key slot retains the first foil relative to the journal sleeve, a first foil cutout window formed in the foil' and a first end tab formed at a free end of the foil, where the first end tab extends into the first top foil cutout window to reduce skewing of the first foil. 12. The assembly of claim 11, wherein the first foil comprises: an intermediate foil portion wrapped in a generally cylindrical shape; and a top foil portion wrapped in a generally cylindrical shape adjacent to the intermediate foil, wherein the top foil and the intermediate foil are joined at a bent region that projects into the key slot in order to retain the bent region relative to the journal sleeve. 13. The assembly of claim 12, wherein the intermediate foil and the top foil are formed from a single integral sheet. 14. The assembly of claim 12 and further comprising: a bump foil wrapped in a generally cylindrical shape and positioned substantially between the journal sleeve and the intermediate foil portion of the first foil, wherein the bump foil has a bent end portion engaged with the key slot. 15. The assembly of claim 14 and further comprising: a first bump foil cutout window formed in the bump foil adjacent to the bent end portion, wherein the first end tab extends into the first bump foil cutout window such that the first end tab can contact the inner diameter surface of the journal sleeve. 16. The assembly of claim 14, wherein the first end tab is formed at a side edge of the top foil. 17. The assembly of claim 14 and further comprising: a second end tab formed at the free end of the top foil, wherein the second end tab is positioned at an opposite side edge of the top foil from the first end tab; and a second top foil cutout window formed in the top foil adjacent to the key slot, wherein the second end tab extends into the second top foil cutout window to reduce skewing of the top foil. 18. The assembly of claim 17, wherein the first end tab has a first axial dimension and the second end tab has a second axial dimension that is different from the first axial dimension for assembly foolproofing. 19. The assembly of claim 11, wherein the key slot is axially offset with respect to an axial length of the journal sleeve. 20. The assembly of claim 11, wherein the first top foil cutout window has a smaller dimension than the first end tab in a generally circumferential direction. 21. A method of manufacturing a hydrodynamic fluid film journal bearing assembly that includes a journal sleeve, a bump foil, an intermediate foil and a top foil, the method comprising: forming a top foil shape that defines a first top foil cutout window at a first side edge of the top foil adjacent to the bent region and a first end tab at a free end of the top foil at the first side edge of the top foil; forming a bent region where the top foil and the intermediate foil join; forming a bend at a first end of the bump foil; machining a key slot through the journal sleeve between opposite inner and outer diameter surfaces of the journal sleeve; wrapping the bump foil into a substantially cylindrical shape; inserting the bend at the first end of the bump foil into the key slot in the journal sleeve; wrapping the intermediate foil in a substantially cylindrical shape; wrapping the top foil and the intermediate foil adjacent to the intermediate foil; inserting the bent region where the top foil and intermediate foils join into the key slot such that the intermediate foil is adjacent to the bump foil; and inserting the first end tab into the first top foil cutout window. 22. The method of claim 21, wherein the step of forming a top foil shape includes defining a second top foil cutout window at a second side edge of the top foil adjacent to the bent region and defining a second end tab at the second side edge of the top foil at the free end of the top foil, the method further comprising: inserting the second end tab into the second top foil cutout window. 23. The method of claim 21, wherein the step of machining a key slot through the journal sleeve between opposite inner and outer diameter surfaces of the journal sleeve comprises electric discharge machining. 24. The method of claim 21, wherein the step of inserting the first end tab into the first top foil cutout window does not require that the first end tab be bent.
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