[특허]Ram air fan bearing housing

Hamilton Sundstrand Corporation

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Ram air fan bearing housing

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01D-025/12 F04D-029/58 F03B-011/02 B64D-033/02 F04D-029/046 F04D-029/64
미국특허분류(USC)	415/180; 415/175; 415/108; 244/053B; 384/900
출원번호	US-0279534 (2011-10-24)
등록번호	US-8882454 (2014-11-11)
발명자 / 주소	Chrabascz, Eric Merritt, Brent J.
출원인 / 주소	Hamilton Sundstrand Corporation
대리인 / 주소	Kinney & Lange, P.A.
인용정보	피인용 횟수 : 3 인용 특허 : 26

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A ram air fan bearing housing for a ram air fan assembly includes a bearing section, a disk section, and radial support ribs. The disk section is at one end of the bearing section for connecting the bearing section to the ram air fan assembly. The disk section includes an outer ring with a circumferential support rib; and a disk wall connecting the outer ring to the bearing section. The disk wall includes arcuate cooling slots defined by edges, including an arcuate edge having an arc center at an axis of the bearing housing and positioned adjacent to and radially inward from the circumferential support rib. The radial support ribs extend axially along most of the length of the bearing section and extend radially along the disk wall to the circumferential support rib. The radial support ribs and the cooling slots alternate about the axis of the bearing housing.

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1. A ram air fan bearing housing for a ram air fan assembly, the bearing housing comprising: a bearing section comprising a cylindrical interior symmetrical about an axis of the bearing housing; the cylindrical interior for containing a journal bearing;a disk section at one end of the bearing section and perpendicular to the axis of the bearing housing, the disk section for connecting the bearing section to the ram air fan assembly, the disk section comprising: an outer ring at an edge of the disk section opposite the bearing section, the outer ring comprising: a plurality of bolt holes; anda circumferential support rib radially inward from the plurality of bolt holes; anda disk wall connecting the outer ring to the bearing section, the disk wall comprising: a plurality of arcuate cooling slots, each cooling slot defined by a plurality of edges including a first arcuate edge; the first arcuate edge positioned adjacent to and radially inward from the circumferential support rib at a first radial distance from the axis of the bearing housing; the first arcuate edge having an arc center at the axis of the bearing housing; anda plurality of radial support ribs extending axially along most of the length of the bearing section, and extending radially along the disk wall from the bearing section to the circumferential support rib; the plurality of radial support ribs spaced equally about the axis of the bearing housing; the plurality of radial support ribs and the plurality of arcuate cooling slots alternating about the axis of the bearing housing. 2. The bearing housing of claim 1, wherein a ratio of a total area of the plurality of arcuate cooling slots to a cross-sectional area of the cylindrical interior in a plane perpendicular to the axis of the bearing housing is about 1.8. 3. The bearing housing of claim 1, wherein a ratio of a total area of the plurality of arcuate cooling slots to a cross-sectional area of the cylindrical interior in a plane perpendicular to the axis of the bearing housing is between 1.48 and 2.17. 4. The bearing housing of claim 1, wherein a ratio of a total area of the plurality of arcuate cooling slots to a total area of the disk wall is about 30 percent. 5. The bearing housing of claim 1, wherein a ratio of a total area of the plurality of arcuate cooling slots to a total area of the disk wall is between 23 percent and 37 percent. 6. The bearing housing of claim 1, wherein the first radial distance is about 2.97 inches (or about 75.4 mm). 7. The bearing housing of claim 1, wherein the first radial distance is between 2.92 inches and 3.01 inches (or between 74.3 mm and 76.6 mm). 8. The bearing housing of claim 1, wherein each of the plurality of arcuate cooling slots extend at least about 28 degrees about the axis of the bearing housing. 9. The bearing housing of claim 1, wherein the plurality of arcuate cooling slots comprise: seven cooling slots, each extending between 27.14 degrees and 28.86 degrees about the axis of the bearing housing; anda large cooling slot extending between 28.14 and 29.86 degrees about the axis of the bearing housing. 10. The bearing housing of claim 9, wherein: the seven cooling slots comprise: six medium cooling slots, each of the medium cooling slots further comprising: a second arcuate edge radially inward from the first arcuate edge at a second radial distance from the axis of the bearing housing, the second arcuate edge having an arc center at the axis of the bearing housing; anda small cooling slot, the small cooling slot further comprising: a first linear edge radially inward from the first arcuate edge, the first linear edge being parallel to a first plane containing the axis of the bearing housing; the first plane perpendicular to a plane bisecting the small cooling slot and also containing the axis of the bearing housing; the first linear edge at a first linear distance from the first plane; andthe large cooling slot further comprises: a third arcuate edge radially inward from the first arcuate edge at a third radial distance from the axis of the bearing housing, the third arcuate edge having an arc center at the axis of the bearing housing; anda second linear edge radially inward from the first arcuate edge; the second linear edge being parallel to a second plane containing the axis of the bearing housing; the second plane perpendicular to a plane bisecting the large cooling slot and also containing the axis of the bearing housing; the second linear edge at a second linear distance from the second plane. 11. The bearing housing of claim 10, wherein the second radial distance is about 2.30 inches (or about 58.4 mm); the third radial distance is about 1.89 inches (or about 48.0 mm); the first linear distance is about 2.35 inches (or about 59.6 mm); and the second linear distance is about 2.15 inches (or about 54.6 mm). 12. The bearing housing of claim 10, wherein the second radial distance is between 2.26 inches and 2.35 inches (or between 57.3 mm and 59.6 mm); the third radial distance is between 1.85 inches and 1.94 inches (or between 46.9 mm and 49.1 mm); the first linear distance is between 2.30 inches and 2.39 inches (or between 58.4 mm and 60.7 mm); and the second linear distance is between 2.11 inches and 2.20 inches (or between 53.5 mm and 55.8 mm). 13. A ram air fan assembly comprising: a fan housing;a fan motor attached to the fan housing;a fan rotor;a thrust shaft connecting the fan motor to the fan rotor;a journal bearing shaft connected to fan motor and the thrust shaft;an inner housing; anda bearing housing attached to the fan housing and connected to the inner housing, the bearing housing containing a journal bearing axially about the journal bearing shaft, the bearing housing comprising: a bearing section comprising a cylindrical interior symmetrical about an axis of the bearing housing; the cylindrical interior for containing a journal bearing;a disk section at one end of the bearing section and perpendicular to the axis of the bearing housing, the disk section for connecting the bearing section to the ram air fan assembly, the disk section comprising: an outer ring at an edge of the disk section opposite the bearing section, the outer ring comprising: a plurality of bolt holes for attaching the bearing housing to the fan housing;an o-ring channel radially outward from the plurality of bolt holes for containing an o-ring seal for connecting the bearing housing to the inner housing; anda circumferential support rib radially inward from the plurality of bolt holes; anda disk wall connecting the outer ring to the bearing section, the disk wall comprising: a plurality of arcuate cooling slots, each cooling slot defined by a plurality of edges including a first arcuate edge; the first arcuate edge positioned adjacent to and radially inward from the circumferential support rib at a first radial distance from the axis of the bearing housing; the first arcuate edge having an arc center at the axis of the bearing housing; anda plurality of radial support ribs extending axially along most of the length of the bearing section, and extending radially along the disk wall from the bearing section to the circumferential support rib; the plurality of radial support ribs spaced equally about the axis of the bearing housing; the plurality of radial support ribs and the plurality of arcuate cooling slots alternating about the axis of the bearing housing. 14. The ram air fan assembly of claim 13, wherein a ratio of a total area of the plurality of arcuate cooling slots to a cross-sectional area of the cylindrical interior in a plane perpendicular to the axis of the bearing housing is about 1.8. 15. The ram air fan assembly of claim 13, wherein a ratio of a total area of the plurality of arcuate cooling slots to a total area of the disk wall is about 30 percent. 16. The ram air fan assembly of claim 13, wherein the first radial distance is about 2.97 inches (or about 75.4 mm). 17. The ram air fan assembly of claim 14, wherein the plurality of arcuate cooling slots comprise: seven cooling slots, each extending between 27.14 degrees and 28.86 degrees about the axis of the bearing housing; anda large cooling slot extending between 28.14 and 29.86 degrees about the axis of the bearing housing. 18. The ram air fan assembly of claim 17, wherein: the seven cooling slots comprise: six medium cooling slots, each of the medium cooling slots further comprising: a second arcuate edge radially inward from the first arcuate edge at a second radial distance from the axis of the bearing housing, the second arcuate edge having an arc center at the axis of the bearing housing; anda small cooling slot, the small cooling slot further comprising: a first linear edge radially inward from the first arcuate edge, the first linear edge being parallel to a first plane containing the axis of the bearing housing; the first plane perpendicular to a plane bisecting the small cooling slot and also containing the axis of the bearing housing; the first linear edge at a first linear distance from the first plane; andthe large cooling slot further comprises: a third arcuate edge radially inward from the first arcuate edge at a third radial distance from the axis of the bearing housing, the third arcuate edge having an arc center at the axis of the bearing housing; anda second linear edge radially inward from the first arcuate edge; the second linear edge being parallel to a second plane containing the axis of the bearing housing; the second plane perpendicular to a plane bisecting the large cooling slot and also containing the axis of the bearing housing; the second linear edge at a second linear distance from the second plane. 19. The ram air fan assembly of claim 18, wherein the second radial distance is about 2.30 inches (or about 58.4 mm); the third radial distance is about 1.89 inches (or about 48.0 mm); the first linear distance is about 2.35 inches (or about 59.6 mm); and the second linear distance is about 2.15 inches (or about 54.6 mm). 20. A method for installing a ram air fan bearing housing in a ram air fan assembly, the bearing housing comprising a disk section including a plurality of medium cooling slots, a small cooling slot and a large cooling slot; and a bearing section including a cylindrical interior for containing a journal bearing, the method comprising: orienting the bearing housing such that the bearing section faces a fan outlet of the ram air fan assembly;inserting the bearing housing into the fan outlet such that the bearing section axially surrounds a journal bearing shaft and the disk section fits against a fan housing;bolting the bearing housing to the fan housing;installing a journal bearing into the cylindrical interior of the bearing section of the bearing housing between the journal bearing shaft and the bearing housing;attaching a speed sensor to a portion of the disk section between the small one of the cooling slots and the journal bearing shaft;feeding electrical wires from the fan housing through the large cooling slot in the disk section;pulling the electrical wires into an inner housing;attaching the inner housing to an o-ring seal around the disk section;connecting a wire transfer tube to the inner housing;feeding the electrical wires from the inner housing, through the wire transfer tube, to a terminal box;connecting the electrical wires to the terminal box; andconnecting a motor bearing cooling tube to the inner housing such that a flow of cooling air from the motor bearing cooling tube flows from the inner housing through the cooling slots to provide cooling to a motor stator within the fan housing and through cylindrical interior of the bearing section to provide cooling to the journal bearing.

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Ram air fan bearing housing

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Ram air fan bearing housing

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이 특허에 인용된 특허 (26)

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