초록 ▼

A turbocharger for an internal combustion engine can provide a two-stage compressor with movable stator blades to shift the compressor performance and match the air output of the turbocharger to varying air requirements of an internal combustion engine. The turbocharger can also be provided with a g

A turbocharger for an internal combustion engine can provide a two-stage compressor with movable stator blades to shift the compressor performance and match the air output of the turbocharger to varying air requirements of an internal combustion engine. The turbocharger can also be provided with a generally optimum boost pressure ratio of about 4.5:1 to 4.6:1. Such a compressor comprises a first axial-compressor stage, typically providing a 1.3:1 pressure boost ratio, and a second radial-compressor stage, typically providing a pressure ratio of 3.5:1. The turbine of such a turbocharger can be a combination flow turbine and can be provided with closure means to vary the turbine geometry and provide more efficient turbine operation at low-engine speeds. The turbocharger includes a roller bearing system adapted to accommodate imbalance. A control system operating in response to engine-operating conditions can operate the compressor-stator vanes and, if present, the turbine closure means.

대표청구항 ▼

A turbocharger system for an internal combustion engine, comprising: means forming a turbine adapted to be driven by exhaust gas from an internal combustion engine comprising: a turbine wheel having a central core and a plurality of outwardly extending vanes, said turbine wheel being rotatable about

A turbocharger system for an internal combustion engine, comprising: means forming a turbine adapted to be driven by exhaust gas from an internal combustion engine comprising: a turbine wheel having a central core and a plurality of outwardly extending vanes, said turbine wheel being rotatable about a central axis; a meridionally divided volute for exhaust gas surrounding said turbine wheel, said meridionally divided volute including a divider wall defining first and second volute passageways with openings at said turbine wheel; means forming a high-pressure compressor driven by said turbine means, said high-pressure compressor comprising: a plurality of rotating compressor blades, said compressor blades adapted to be driven in rotation about said central axis by said turbine means to deliver a flow of air at high pressures for an internal combustion engine, and a plurality of stator blades being moveable about longitudinal axes generally transverse to said central axis to impart positive or negative pre-whirl motion to the air leaving the stator blades prior to entering the rotating blades of the compressor stage; closure means for providing a flow of engine exhaust gas from one of said first and second volute passageways into said turbine wheel; and a control means for operating said closure means and said stator blades in synchronization.