Turbocharger cooling and lubricating system

Claim 1

A turbocharger comprising a housing, a shaft mounted for rotation about a longitudinal axis thereof and having an impeller and a turbine wheel attached to opposite ends thereof for simultaneous rotation therewith, a first bearing means, Positioned closely adjacent to said turbine wheel, rotatably mounting said shaft in said housing, lubricating means comprising primary passage means for communicating lubricating oil through said first bearing means for lubricating same, outlet passage means positioned between said first bearing means and said turbine wheel for receiving lubricating oil passed through said bearing means, annular sealing means positioned axially between said turbine wheel and said outlet passage means, and cooling means comprising a secondary passage means formed in said housing directly communicating said primary passage means with said outlet passage means and terminating thereat in a restricted passageway leading into a radially disposed passageway relative to said longitudinal axis adjacent to said sealing means for constantly cooling and washing the area between said first bearing means and said sealing means, a second bearing means spaced from said first mentioned bearing means in the direction of said longitudinal axis to define an annular chamber with said housing, said primary passage means communicating with said annular chamber, thrust bearing means mounted about said shaft between said impeller and said second bearing means, additional passage means communicating said primary passage means with said thrust bearing for communicating lubrication oil thereto, and a pressurized source means for continuously communicating lubricating oil to said primary passage means from said outlet passage means.