Patent ID: 8678755
Filing Date: 2014-03-25
Classification: F01D,F02B,F02C,F05D,Y02T

Abstract:
1. A turbocharger comprising: a compressor wheel mounted within a compressor housing; a turbine wheel mounted within a turbine housing and connected to the compressor wheel by a shaft; the turbine housing defining an exhaust gas inlet connected to a volute that surrounds the turbine wheel, the turbine housing further defining an axial bore through which exhaust gas that has passed through the turbine wheel is discharged from the turbine housing; the turbine housing defining an annular bypass passage surrounding the bore and arranged to allow exhaust gas to bypass the turbine wheel; and an annular bypass valve disposed in the bypass passage, the bypass valve comprising a fixed annular valve seat and a rotary annular valve member arranged coaxially with the valve seat relative to an axis, the valve member defining a plurality of first orifices therethrough, the valve seat defining a plurality of second orifices therethrough, the valve member being disposed against the valve seat and being rotatable about the axis for selectively varying a degree of alignment between the respective orifices therethrough, ranging from no alignment defining a closed condition of the bypass valve, to at least partial alignment defining an open condition of the bypass valve, wherein the valve member is a generally flat annular disk having the first orifices circumferentially spaced apart about a circumference of the valve member, and the valve seat is a generally flat annular disk having the second orifices circumferentially spaced apart about a circumference of the valve seat, wherein one of the valve member and the valve seat includes raised pads surrounding the respective first or second orifices therein, the pads being in contact with a substantially planar surface of the other of the valve member and the valve seat so as to provide sealing between the valve member and the valve seat.