[특허]High efficiency and durable ball bearing system with reduced turbine end heat transfer

BorgWarner Inc.

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High efficiency and durable ball bearing system with reduced turbine end heat transfer

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16C-037/00 F16C-033/66 F02C-006/12
출원번호	US-0573775 (2014-12-17)
등록번호	US-9212700 (2015-12-15)
발명자 / 주소	Bucking, Michael Chandramohanan, Raj
출원인 / 주소	BorgWarner Inc.
대리인 / 주소	BrooksGroup
인용정보	피인용 횟수 : 3 인용 특허 : 3

초록

A product for use with a turbocharger is disclosed. According to a number of variations, the product may include a bearing housing with a bearing assembly positioned in the bearing housing. A shaft may extend through the bearing assembly for rotation. A turbine wheel may be exposed to high temperature exhaust gases and may be connected to the shaft. The product may include a number of features to manage heat transfer and protect the bearing assembly from excessive temperatures that may otherwise result from exposure to the exhaust gases.

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1. A product for use with a turbocharger system comprising: a bearing housing; a first flange extending from the bearing housing in a radial direction, the first flange configured to connect with a compressor housing; a second flange on the bearing housing configured to connect with a turbine housing; a bearing cavity extending along a central axis of the bearing housing, the bearing cavity being configured to receive a bearing assembly; a turbine end spacer wall of the bearing housing extending in the radial direction, the turbine end spacer wall defining an end opening that opens to the bearing cavity; a first wall section of the bearing housing extending in an axial direction toward the turbine housing and the first wall section extending around the bearing cavity, the first wall section turning radially inward toward the central axis and connecting with the turbine end spacer wall; a second wall section extending in the axial direction toward the turbine wheel and the second wall section extending around the first wall section, the second wall section having a terminal end configured to engage with a heat shield; an air dam cavity defined between the first wall section and the second wall section; and a cooling fin positioned between the first and second flanges, the cooling fin extending from the bearing housing in the radial direction and extending away from the central axis, and the cooling fin extending circumferentially around a majority of the bearing housing, wherein the bearing housing includes a number of cooling pockets that are disposed in an annular configuration around the first flange, the cooling pockets located on an outside of the bearing housing. 2. The product according to claim 1 wherein the air dam extends into the bearing housing from the terminal end of the second wall section toward the compressor flange and past the cooling fin. 3. The product according to claim 2 wherein the cooling fin is a first cooling fin and wherein the housing includes a second cooling fin positioned between the first and second flanges, the second cooling fin extending from the bearing housing in the radial direction and away from the central axis, and the second cooling fin extending circumferentially around a majority of the bearing housing. 4. The product according to claim 1 wherein a cavity is defined by the bearing housing at a juncture of the first wall section and the turbine end spacer wall, the cavity extending circumferentially around the central axis. 5. A product for use with a turbocharger system comprising: a bearing housing; a first flange extending from the bearing housing in a radial direction, the first flange configured to connect with a compressor housing; a second flange on the bearing housing configured to connect with a turbine housing; a bearing cavity extending along a central axis of the bearing housing, the bearing cavity being configured to receive a bearing assembly; a turbine end spacer wall of the bearing housing extending in the radial direction, the turbine end spacer wall defining an end opening that opens to the bearing cavity; a first wall section of the bearing housing extending in an axial direction toward the turbine housing and the first wall section extending around the bearing cavity, the first wall section turning radially inward toward the central axis and connecting with the turbine end spacer wall; a second wall section extending in the axial direction toward the turbine wheel and the second wall section extending around the first wall section, the second wall section having a terminal end configured to engage with a heat shield; an air dam cavity defined between the first wall section and the second wall section; and a cooling fin positioned between the first and second flanges, the cooling fin extending from the bearing housing in the radial direction and extending away from the central axis, and the cooling fin extending circumferentially around a majority of the bearing housing, wherein a cavity is defined by the bearing housing at a juncture of the first wall section and the turbine end spacer wall, the cavity extending circumferentially around the central axis, and wherein the bearing housing includes an oil jet opening to the cavity, the oil jet directed an angle toward the central axis. 6. A product for use with a turbocharger system comprising: a housing having a bearing opening; a bearing assembly positioned in the bearing opening, the bearing assembly having a central opening that extends through the bearing assembly; a shaft extending through the central opening, the shaft having a first end and a second end; a compressor wheel fixed to the first end of the shaft; a turbine wheel fixed to the second end of the shaft; wherein the shaft includes a bearing segment near the second end; wherein the housing includes a turbine end spacer wall defining an end opening; wherein the bearing segment is positioned in the end opening with a seal ring positioned between the bearing segment and the housing inside the end opening; wherein the housing includes a first wall section extending toward the turbine wheel, and the first wall section extending around the bearing opening, the first wall section turning radially inward and connecting with the turbine end spacer wall; wherein the housing includes a second wall section extending toward the turbine wheel, and the second wall section extending around the first wall section, the second wall section having a terminal end; a heat shield having an inner opening through which the shaft extends, the heat shield having an outer flange that is engaged with the terminal wall, wherein the heat shield substantially closes an air dam defined between the housing and the heat shield, and the air dam defined between the first wall section and the second wall section; wherein an oil used in the bearing assembly is separated from the air dam by the seal ring, wherein the housing includes at least one fin that extends radially outward from the housing and around the air dam, the air dam and the at least one fin configured to direct heat through the second wall section and through the at least one fin and away from the bearing assembly, and wherein the housing includes a number of cooling pockets disposed in an annular configuration, and the cooling pockets located on an outside of the housing. 7. The product according to claim 6 wherein the heat shield includes an inner wall disposed toward the housing and the heat shield includes an outer wall disposed toward the turbine wheel, with an air gap defined between the inner wall and the outer wall. 8. The product according to claim 6 wherein the flange of the heat shield includes a number of extending tabs configured to minimize a contact area between the heat shield and the housing to minimize a heat transfer between the heat shield and the housing. 9. The product according to claim 6 wherein an axis is defined by a centerline of the shaft, wherein the air dam extends into the housing away from the turbine wheel and beyond a radially extending line that passes through the fin and the axis. 10. A product for use with a turbocharger system comprising: a housing having a bearing opening; a bearing assembly positioned in the bearing opening, the bearing assembly having a central opening that extends through the bearing assembly; a shaft extending through the central opening, the shaft having a first end and a second end; a compressor wheel fixed to the first end of the shaft; a turbine wheel fixed to the second end of the shaft; wherein the shaft includes a bearing segment near the second end; wherein the housing includes a turbine end spacer wall defining an end opening; wherein the bearing segment is positioned in the end opening with a seal ring positioned between the bearing segment and the housing inside the end opening; wherein the housing includes a first wall section extending toward the turbine wheel, and the first wall section extending around the bearing opening, the first wall section turning radially inward and connecting with the turbine end spacer wall; wherein the housing includes a second wall section extending toward the turbine wheel, and the second wall section extending around the first wall section, the second wall section having a terminal end; a heat shield having an inner opening through which the shaft extends, the heat shield having an outer flange that is engaged with the terminal wall, wherein the heat shield substantially closes an air dam defined between the housing and the heat shield, and the air dam defined between the first wall section and the second wall section; wherein an oil used in the bearing assembly is separated from the air dam by the seal ring, further comprising a flinger positioned around the shaft near the turbine end spacer wall, the flinger including a cupped section that opens toward the turbine end spacer wall and ends at an outer rim, the cupped section having a back; and the outer rim disposed in a cavity defined by the housing, the cavity defined at a juncture of the first wall section and the turbine end spacer wall, and wherein the housing includes an oil jet directed at the back of the cupped section of the flinger to direct oil from the flinger at the housing, inside the cavity, to cool the housing around the juncture of the first wall section and the turbine end spacer wall. 11. The product according to claim 10 wherein the cavity includes a drain and wherein the flinger is shaped to direct oil away from the bearing segment of the shaft so that oil proceeds through the drain and the air dam remains free of oil. 12. The product according to claim 11 wherein the bearing assembly includes an inner race and the flinger includes an annular section that is enlarged, the annular section captured between the inner race and the bearing section of the shaft. 13. A product for use with a turbocharger system comprising: a bearing housing; a bearing assembly positioned in the bearing housing, the bearing assembly lubricated with oil, a rotatable shaft extending through the bearing assembly; a turbine wheel connected to the shaft; wherein a cavity is defined by the bearing housing between the bearing assembly and the turbine wheel; and an oil flinger positioned on the shaft adjacent the bearing assembly, the oil flinger extending into the cavity, the oil flinger configured to direct oil against the housing inside the cavity to cool the housing, wherein the flinger includes a cupped section that opens toward the turbine wheel and ends at an outer rim, the cupped section having a back; and the outer rim is disposed in the cavity, wherein the housing includes an oil jet directed at the back of the cupped section of the flinger. 14. The product according to claim 13 further comprising a heat shield having a central opening and having a peripheral rim flange, the peripheral rim flange having a number of tabs positioned against the bearing housing. 15. The product according to claim 14 wherein the heat shield has an inner wall and an outer wall, with an air gap defined between the inner wall and the outer wall. 16. A product for use with a turbocharger system comprising: a bearing housing extending between a first flange adapted to connect with a compressor housing and a second flange adapted to connect with a turbine housing, wherein the turbine housing defines a volute adapted to channel exhaust gases, wherein the bearing housing has a cooling fin extending away from the bearing housing in a radial direction, the cooling fin extending around a majority of the bearing housing and positioned between the first and second flanges; a bearing assembly positioned in the bearing housing; a shaft extending through the bearing assembly, the shaft configured to rotate; a turbine wheel connected to the shaft; wherein an air dam is defined by the bearing housing and the air dam is configured to direct heat from the exhaust gases through the bearing housing and away from the bearing assembly and toward the cooling fin, the air dam extending away from the turbine wheel and into the bearing housing and terminating at a blind end, the blind end located further from the exhaust gases than the cooling fin, the air dam inhibiting conduction of heat.

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High efficiency and durable ball bearing system with reduced turbine end heat transfer

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High efficiency and durable ball bearing system with reduced turbine end heat transfer

초록

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이 특허에 인용된 특허 (3)

이 특허를 인용한 특허 피인용횟수: 3

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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