Patent ID: 8684675
Filing Date: 2014-04-01
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 being disposed against the valve seat and being rotatable about the axis; the valve member defining a plurality of first orifices therethrough, and the valve seat defining a plurality of second orifices therethrough, the first orifices having a first circumferential spacing therebetween and the second orifices having a second circumferential spacing therebetween, wherein the first circumferential spacing is different from the second circumferential spacing, and wherein at least partial alignment between one of the first orifices and a corresponding one of the second orifices creates a flow passage for flow of exhaust gas therethrough; rotation of the valve member about the axis causing variation in a degree of alignment between the first orifices defined through the valve member and the second orifices defined through the valve seat, 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.