A turbocharger includes a turbine, a compressor, and a bearing housing forming a bearing bore. A bearing arrangement is disposed between a shaft interconnecting the turbine and compressor wheels, and the bearing housing. The bearing arrangement includes first and second bearings formed within an out
A turbocharger includes a turbine, a compressor, and a bearing housing forming a bearing bore. A bearing arrangement is disposed between a shaft interconnecting the turbine and compressor wheels, and the bearing housing. The bearing arrangement includes first and second bearings formed within an outer bearing race element having an outer wall that engages a bearing bore along four bearing surfaces that are disposed in pairs around two oil feed galleys formed in the outer wall, the outer wall further forming peripherally extending oil drainage grooves disposed such that oil provided from the oil feed galleys that passes through some of the bearing surfaces drains through the peripherally extending oil drainage grooves.
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1. A turbocharger, comprising: a turbine that includes a turbine wheel;a compressor that includes a compressor wheel;a bearing housing disposed and connected between the turbine and the compressor, the bearing housing forming a bearing bore and first and second oil feed passages;a shaft rotatably di
1. A turbocharger, comprising: a turbine that includes a turbine wheel;a compressor that includes a compressor wheel;a bearing housing disposed and connected between the turbine and the compressor, the bearing housing forming a bearing bore and first and second oil feed passages;a shaft rotatably disposed within the bearing housing and extending into the turbine and the compressor, wherein the turbine wheel is connected to one end of the shaft and wherein the compressor wheel is connected to an opposite end of the shaft such that the turbine wheel is rotatably disposed in the turbine and the compressor wheel is rotatably disposed in the compressor;first and second bearings disposed between the shaft and the bearing housing, each of the first and second bearings formed between an outer race disposed in the bearing bore, and an inner race disposed in the outer race;wherein the outer race has a hollow cylindrical shape that forms an outer wall that engages the bearing bore along first, second, third and fourth cylindrical bearing surfaces, the outer wall having a first end disposed adjacent the first bearing surface and a second end disposed adjacent the fourth bearing surface;wherein close to the first end, the outer wall forms a first oil feed galley that at least partially overlaps with the first oil feed passage and is disposed between the first and second bearing surfaces in an axial direction along the bearing bore; andwherein close to the second end, the outer wall forms a second oil feed galley that at least partially overlaps with the second oil feed passage and is disposed between the third and fourth bearing surfaces in the axial direction;wherein the outer race further forms first and second peripherally extending oil drainage grooves disposed between the second and third bearing surfaces, such that: oil provided from the first oil feed galley that passes through the second bearing surface drains through the first peripherally extending oil drainage groove, andoil provided from the second oil feed galley that passes through the third bearing surface drains though the second peripherally extending oil drainage groove, andwherein an end outer surface of the inner race that faces the outer race forms a radially outward extending portion that slopes away from the shaft such that oil provided through the first bearing surface is flung in a radially outward direction. 2. The turbocharger of claim 1, wherein the outer wall further forms drainage openings that fluidly connect a cylindrical space defined within the outer race with a lubrication cavity defined within the bearing housing, the drainage openings operating to drain out any oil collecting within the outer race. 3. The turbocharger of claim 1, wherein oil provided through the first oil feed galley that passes through the first bearing surface drains past the first end of the outer wall. 4. The turbocharger of claim 3, wherein oil provided through the second oil feed galley that passes through the fourth bearing surface drains past the second end of the outer wall. 5. The turbocharger of claim 1, wherein the outer wall is free to rotate within the bearing bore in a rotational motion that is dampened by a viscosity of an oil film present along the first, second, third and fourth bearing surfaces during operation. 6. The turbocharger of claim 1, wherein the inner race forms a flared portion having an increased inner diameter with respect to end portions thereof that engage the shaft. 7. The turbocharger of claim 6, wherein the shaft is connected to the inner race at end portions, the end portions having a first diameter, the shaft further forming a slender portion between the end portions, the slender portion having a second diameter that is less than the first diameter. 8. The turbocharger of claim 7, wherein the increased inner diameter of the inner race overlaps in an axial direction with the slender portion of the shaft. 9. The turbocharger of claim 1, wherein the inner race is formed by two components, a compressor-side cup and a turbine-side cup. 10. A method for rotatably and sealably supporting a shaft within a bearing housing of a turbocharger, comprising: connecting a turbine wheel at one end of the shaft;forming a first roller bearing by engaging a first plurality of rollers with a first inner race groove formed in an inner race and with a first outer race groove formed in an outer race;forming a second roller bearing by engaging a second plurality of rollers with a second inner race groove formed in the inner race and with a second outer race groove formed in the outer race;engaging the outer race between a bearing bore formed in the bearing housing and the shaft, which extends through the bearing bore, such that the inner race rotates with the shaft with respect to the outer race;wherein the outer race has a hollow cylindrical shape that forms an outer wall that engages the bearing bore along first, second, third and fourth cylindrical bearing surfaces, the outer wall having a first end disposed adjacent the first bearing surface and a second end disposed adjacent the fourth bearing surface;wherein close to the first end, the outer wall forms a first oil feed galley that at least partially overlaps with a first oil feed passage and is disposed between the first and second bearing surfaces in an axial direction along the bearing bore; andwherein close to the second end, the outer wall forms a second oil feed galley that at least partially overlaps with a second oil feed passage and is disposed between the third and fourth bearing surfaces in the axial direction;providing oil through the first oil feed passage to fill the first oil feed galley and cause oil to pass through radial gaps between the bearing bore and the first and second bearing surfaces;providing oil through the second oil feed passage to fill the second oil feed galley and cause oil to pass through additional radial gaps between the bearing bore and the third and fourth bearing surfaces;wherein the outer race further forms first and second peripherally extending oil drainage grooves along the outer wall and disposed between the second and third bearing surfaces, such that: oil provided from the first oil feed galley that passes through the second bearing surface drains through the first peripherally extending oil drainage groove, andoil provided from the second oil feed galley that passes through the third bearing surface drains though the second peripherally extending oil drainage groove, andforming a radially outward extending portion at an end outer surface of the inner race that faces the outer race, the radially outward extending portion sloping away from the shaft such that oil provided through the first bearing surface is flung in a radially outward direction. 11. The method of claim 10, further comprising providing drainage openings through the outer wall to fluidly connect a cylindrical space defined within the outer race with a lubrication cavity defined within the bearing housing, wherein the drainage openings drain out any oil collecting within the outer race. 12. The method of claim 10, further comprising draining past the first end of the outer wall oil provided from the first oil feed galley through the first bearing surface. 13. The method of claim 12, further comprising draining past the second end of the outer wall oil provided from the second oil feed galley through the fourth bearing surface. 14. The method of claim 10, further comprising allowing the outer race to rotate within the bearing bore in a rotational motion that is dampened by a viscosity of an oil film present along the first, second, third and fourth bearing surfaces during operation. 15. The method of claim 10, further comprising stiffening an assembly that includes the inner race and the shaft by providing a flared portion having an increased inner diameter on the inner race with respect to end portions thereof that engage the shaft. 16. The method of claim 15, wherein the shaft is connected to the inner race at end portions, the end portions having a first diameter, the shaft further forming a slender portion between the end portions, the slender portion having a second diameter that is less than the first diameter. 17. The method of claim 16, wherein the increased inner diameter of the inner race overlaps in an axial direction with the slender portion of the shaft. 18. An internal combustion engine having a plurality of combustion chambers formed in a cylinder block, an intake manifold disposed to provide air or a mixture of air with exhaust gas to the combustion chambers, and an exhaust manifold disposed to receive exhaust gas from the combustion chambers, the engine further comprising: a turbine that includes a turbine housing surrounding a turbine wheel, the turbine housing being fluidly connected to the exhaust manifold and disposed to receive exhaust gas therefrom to drive the turbine wheel;a compressor that includes a compressor housing that surrounds a compressor wheel, the compressor housing being fluidly connected to the intake manifold and disposed to provide air thereto;a bearing housing disposed and connected between the turbine and the compressor, the bearing housing forming a bearing bore therethrough that accommodates a shaft interconnecting the turbine wheel and the compressor wheel to transfer power therebetween, the bearing housing further forming first and second oil feed passages;wherein the shaft is rotatably mounted within the bearing housing and extends into the turbine and the compressor such that the turbine wheel is connected to one end of the shaft and the compressor wheel is connected to an opposite end of the shaft;first and second bearings disposed between the shaft and the bearing housing each of the first and second bearings formed by a respective first and second plurality of rollers;an outer race disposed within the bearing bore and including first and second outer race grooves, and an inner race including first and second inner race grooves;wherein the outer race has a hollow cylindrical shape that forms an outer wall that engages the bearing bore along first, second, third and fourth cylindrical bearing surfaces, the outer wall having a first end disposed adjacent the first bearing surface and a second end disposed adjacent the fourth bearing surface;wherein close to the first end, the outer wall forms a first oil feed galley that at least partially overlaps with the first oil feed passage and is disposed between the first and second bearing surfaces in an axial direction along the bearing bore;wherein close to the second end, the outer wall forms a second oil feed galley that at least partially overlaps with the second oil feed passage and is disposed between the third and fourth bearing surfaces in the axial direction;wherein the outer race further forms first and second peripherally extending oil drainage grooves disposed between the second and third bearing surfaces, such that: oil provided from the first oil feed galley that passes through the second bearing surface drains through the first peripherally extending oil drainage groove, andoil provided from the second oil feed galley that passes through the third bearing surface drains though the second peripherally extending oil drainage groove, andwherein an end outer surface of the inner race that faces the outer race forms a radially outward extending portion that slopes away from the shaft such that oil provided through the first bearing surface is flung in a radially outward direction.
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