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US 6,874,998 B2Granted
Turbocharger with reduced coking
AssigneeBorgWagner Inc.
InventorSteve Roby
Life of this patent
Estimating the term…
Abstract
A turbocharger including means for preventing or reducing coking, particularly following engine shutdown, without noticeably increasing weight or volume of the turbocharger. The turbocharger bearing housing (14) has defined therein a lubrication flow path for bearing lubricant and a lubricant drain gallery (40) below a shaft (20), and in accordance with the invention at least a portion of a wall (42) of the lubricant drain gallery (40) is coated with an oil repellant and/or heat insulating coating (44).
Claims16
A turbocharger comprising:
- a bearing housing (14) journaling an elongate shaft (20) therein,
- a turbine wheel (22) carried at one end of said shaft (20),
- a compressor wheel (24) carried at the opposite end of said shaft (20),
- a turbine housing (28) defining an exhaust gas inlet (30) to said turbine wheel (22) and an exhaust gas outlet (32) therefrom,
- a compressor housing (34) defining an air inlet (36) to said compressor wheel (24) and an air outlet (38) therefrom, and
- said bearing housing further defining a lubrication flow path for lubricant and a lubricant drain gallery (40) below said shaft,
- wherein at least a portion of the lubricant drain gallery (40) is coated with an oil repelling coating (44).
4 more elements
A turbocharger comprising:
- a bearing housing (14) journaling an elongate shaft (20) therein,
- a turbine wheel (22) carried at one end of said shaft (20),
- a compressor wheel (24) drivingly carried at the opposite end of said shaft (20),
- a turbine housing (28) defining an exhaust gas inlet (30) to said turbine wheel (22) and an exhaust gas outlet (32) therefrom,
- a compressor housing (34) defining an air inlet (36) to said compressor wheel (24) and an air outlet (38) therefrom, and
- said bearing housing further defining a lubrication flow path for lubricant and a lubricant drain gallery (40) below said shaft,
- wherein at least a portion of the lubricant drain gallery (40) is coated with a heat insulating and oil repelling coating (44).
4 more elements
A turbocharger comprising:
- a bearing housing means (14) for spacing apart respective compressor housing (34) and turbine housing (28) portions and journaling an elongate shaft (20) extending between said housing portions (34, 28),
- a compressor rotor (24) and a turbine rotor (22) each connected to said shaft (20) at opposite ends thereof and rotatable within respective ones of said housing portions,
- bearing means (18) carried by said bearing-housing means proximate to said turbine housing (28) portion and rotatably supporting said shaft (20),
- said shaft defining a first conductive heat transfer path extending from said turbine rotor to said bearing, and
- lubrication means causing lubricant to flow over said bearing (18) and to a lubricant drain gallery (40),
- wherein a second conductive heat transfer path extends from said turbine housing (28) to said bearing housing (14) and from said bearing housing (14) to said lubricant drain gallery (40), and
- wherein at least a part of said lubricant drain gallery (40) is coated with an oil repellant and heat insulating coating (44).
4 more elements
Dependencies are inferred from the claim text.