Turbocharger for two-cycle engines and method of operation thereof

A turbocharger for use with two-cycle engines burning a liquid fuel/oil and air mixture and having an oil and oil mist containing crankcase comprising:

• (a) a shaft mounted in a housing for rotation by an exhaust-driven turbine on one end to drive a compressor on the other end connected to supply pressurized air for the fuel/air mixture of the engine;
• (b) a pair of ball bearings supporting the shaft for rotation within the housing disposed adjacent respective ends of the shaft;
• (c) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (d) a first conduit in the housing communicating between an intake portion of the compressor and the adjacent one of said bearings;
• (e) second and third conduits in the housing communicating from outside the housing to a point inside the housing between said sealing means and said one of said bearings adjacent thereto;
• (f) means for allowing oil mist to pass through said bearings between said second conduit and said first conduit at least at low engine rpm's;
• and,
• (g) means for allowing liquid fuel/oil mixture to pass through said bearings between said third conduit and said first conduit and enter the air being pressurized by said air pressurizing turbine at high engine rpm's.

A turbocharger for use with a two cycle engine burning a liquid fuel/oil and air mixture comprising:

• (a) a shaft mounted in a housing for rotation by an exhaust-driven turbine on one end to drive a compressor on the other end connected to supply air for the fuel/air mixture of the engine;
• (b) a pair of ball bearings supporting the shaft for rotation within the housing disposed adjacent respective ends of the shaft;
• (c) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (d) a first conduit in the housing communicating between an intake portion of the compressor and the adjacent one of said bearings;
• (e) a second conduit in the housing communicating from outside the housing to a point inside the housing between said sealing means and said one of said bearings adjacent thereto;
• and
• (f) means for allowing liquid fuel/oil mixture to pass through said bearings between said second conduit and said first conduit and enter the air being pressurized by said compressor at high engine rpm's.

A turbocharger for use with two cycle engines burning a liquid fuel/oil and air mixture and having an oil and oil mist containing crankcase comprising:

• (a) a shaft mounted in a housing for rotation by an exhaust-driven turbine on one end to drive a compressor on the other end connected to supply air for the fuel/air mixture of the engine;
• (b) a pair of ball bearings supporting the shaft for rotation within the housing adjacent respective ends of the shaft;
• (c) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (d) a first conduit in the housing communicating between an intake portion of the compressor and the adjacent one of said bearings;
• (e) a second conduit in the housing communicating from outside the housing to a point inside the housing between said sealing means and said one of said bearings adjacent thereto;
• and,
• (f) means for allowing oil mist to pass through said bearings between said second conduit and said first conduit at least at low engine rpm's.

A turbocharger for use with a two-cycle engine having at least one carburetor with a fuel bowl and burning a liquid fuel/oil and air mixture comprising:

• (a) a shaft mounted in a housing for rotation by an exhaust-driven turbine on one end to drive a compressor on the other end connected to supply pressurized air for the fuel/air mixture of the engine;
• (b) a pair of ball bearings supporting the shaft for rotation within the housing adjacent respective ends of the shaft;
• (c) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (d) a first conduit in the housing communicating between an intake portion of the compressor and the adjacent one of said bearings;
• (e) a second conduit in the housing communicating from outside the housing to a point inside the housing between said sealing means and said one of said bearings adjacent thereto;
• and,
• (f) a hose connected between said fuel bowl and said second conduit, whereby as the turbocharger boost is increased the pressure in said bowl increases in pressure until it exceeds the pressure in said housing at which time the liquid fuel/oil mixture flows into said housing and through said bearings.

A turbocharger for use with a two-cycle engine having a fuel pump providing fuel under pressure at an output thereof and burning a liquid fuel/oil and air mixture comprising:

• (a) a shaft mounted in a housing for rotation by an exhaust-driven turbine on one end to drive a compressor on the other end connected to supply air for the fuel/air mixture of the engine;
• (b) a pair of ball bearings supporting the shaft for rotation within the housing adjacent respective ends of the shaft;
• (c) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (d) a first conduit in the housing communicating between an intake portion of the compressor and the adjacent one of said bearings;
• (e) a second conduit in the housing communicating from outside the housing to a point inside the housing between said sealing means and said one of said bearings adjacent thereto;
• and,
• (f) regulator valve means connected to receive fuel from said fuel pump and controlled by a line sensing intake manifold pressure of the engine for outputting fuel at an output thereof at a pressure directly related thereto;
• and,
• (g) a hose connected between said output of said regulator valve means and said second conduit, whereby both lubrication of said bearings and enrichment of the fuel/air mixture to the engine increase and decrease in direct relationship to increases and decreases in the turbo boost being applied to the engine.

A lubrication system for a turbocharger for a two cycle engine having an oil and oil mist containing crankcase and burning a mixture of liquid fuel contaning lubricating oil therein wherein the turbocharger comprises a shaft mounted in a exhaust-driven turbine on one end to drive a compressor on the other end connected to supply pressurized air for the fuel/air mixture of the engine, comprising:

• (a) a pair of ball bearings supporting the shaft within the housing adjacent respective ends of the shaft;
• (b) sealing means disposed between the exhaust-driven turbine and the adjacent one of said bearings for blocking the passage of exhaust gasses into said housing;
• (c) first conduit means in the housing communicating between an intake portion of the compressor and the other one of said bearings for creating a low pressure area adjacent said other one of said bearings;
• (d) a source of the liquid fuel/oil mixture at a pressure directly related to the intake manifold pressure of the engine;
• and,
• (e) second conduit means in the housing connecting said source to a point inside the housing between said sealing means and said adjacent one of said bearings adjacent thereto, whereby at least at high engine rpm's, fuel containing lubricating oil is allowed to pass through said bearings and out said first conduit to join the pressurized air being created by the compressor to provide lubrication and cooling of said bearings while simultaneously enriching the air/fuel mixture.

In a turbocharger for a two cycle engine having an oil and oil mist containing crankcase and burning a mixture of liquid fuel containing lubricating oil therein, wherein the turbocharger comprises a shaft mounted in a housing, by means of ball bearings disposed adjacent respective ends of said shaft, for rotation by an exhaust driven turbine on one end to drive a compressor on the other end of said shaft connected to supply air for the fuel/air mixture of the engine, the method of operation to supply lubrication to the shaft and automatically enrichen the fuel/air mixture during high speed turbo charging, comprising the steps of:

• (a) preventing the passage of exhaust gases from the exhaust driven turbine into the shaft housing;
• (b) drawing oil mist from said crankcase by vacuum pressure, created by said compressor, through said ball bearings, to an intake portion of said compressor to join pressurized air produced by the compressor;
• and
• (c) drawing liquid fuel/oil mixture oil from a pressurized fuel source by pressure differential, created by said compressor, through said ball bearings when operating loads in said ball bearings render this desirable, to an air intake portion of said compressor, thereby to join pressurized air produced by the compressor, thereby to provide additional lubrication and cooling of the bearings while simultaneously enriching the air/fuel mixture provided to the engine.