US 4,364,717 AGranted

Exhaust gas turbocharger

AssigneeBarmag Barmer Maschinenfabrik AG

InventorsHeinz Schippers, Werner Branscheid, Erich Lenk, Udo Hardt

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Abstract

An apparatus for turbocharging an internal combustion engine, and which is characterized by the ability to avoid excessive heat transfer to the bearings and any other heat sensitive components. In the preferred embodiment, the lubricating oil for the bearings in the turbocharger housing is directed through a passageway in the bearing shaft and is discharged onto the end wall of the bearing housing in a circular pattern, to thereby cool the end wall and minimize heat transfer from the turbine to the bearings in the housing. Also, the end wall of the bearing housing is spaced from the adjacent rear wall of the turbine housing to define a cooling air gap therebetween, and apertures are provided in the housing for permitting air to flow through the cooling gap to cool the opposing surfaces of the two adjacent walls and thereby minimize heat transfer therebetween. Still further, the turbocharger of the present invention may include an air duct for conveying a portion of the compressed air into the turbine housing, to thereby lower the temperature of the exhaust gases and thus also the temperature of the turbine.

Claims18

Dependent claims

An apparatus for turbocharging an internal combustion engine, and characterized by the ability to avoid excessive heat transfer to heat sensitive components thereof, said apparatus comprising

an exhaust gas turbine comprising a turbine housing and a turbine wheel,
a rotary compressor comprising a compressor housing and a compressor wheel,
a shaft mounting said turbine wheel at one end thereof and said rotary compressor wheel at the other end thereof,
a bearing housing having an end wall with an opening therethrough,
bearing means rotatably mounting said shaft in said bearing housing so that said shaft extends through said opening of said end wall, and with said turbine wheel being disposed on the outside of said end wall,
said turbine housing having a rear wall with an opening therethrough,
means mounting said turbine housing to said bearing housing so that said turbine housing operatively encloses said turbine wheel, and with said shaft extending through said opening of said turbine housing rear wall and with said bearing housing end wall being opposed to and spaced from said turbine housing rear wall to define an annular cooling gap therebetween, and including aperture means permitting ambient air to flow through said cooling gap by natural convection during operation of the apparatus to cool the opposing surfaces of said end wall and said rear wall and thereby minimize heat transfer therebetween, and
means for directing a continuous stream of oil onto the surface of said bearing housing end wall to thereby cool the same.

5 more elements

An apparatus for turbocharging an internal combustion engine, and characterized by the ability to avoid the overheating of heat sensitive components thereof, and comprising

an exhaust gas turbine comprising a turbine housing and a turbine wheel,
a rotary compressor comprising a compressor housing and a compressor wheel,
a shaft mounting said turbine wheel at one end thereof and said rotary compressor wheel at the other end thereof, said shaft including an internal passageway which defines an inlet and a radially directed outlet adjacent said one end,
a bearing housing having an end wall with an opening therethrough,
bearing means rotatably mounting said shaft in said bearing housing so that said shaft extends through said opening of said end wall, and with said turbine wheel disposed adjacent the outside of said end wall and said passageway outlet disposed adjacent and sufficiently close to the inside of said end wall such that oil supplied to said passageway during rotation of the shaft moves through the passageway and exits radially from said outlet and contacts the inside surface of said end wall in a circular pattern to thereby cool the same, said bearing means including a pair of rotary bearings mounted in axially spaced relation on said shaft, with said inlet of said shaft passageway disposed intermediate said rotary bearings, and
duct means for conducting oil to said inlet of said shaft passageway during rotation of said shaft, said duct means including passage means within said bearing housing for conducting pressurized oil to said bearings and for conducting oil from said bearings to said inlet.

3 more elements

Dependencies are inferred from the claim text.