초록 ▼

A particularly efficient and reliable motor-assisted turbocharger for internal combustion engines includes an assisting electric motor, a combination flow turbine wheel which may be inserted and removed from the turbocharger assembly through the exhaust opening of the turbine casing, and a divided v

A particularly efficient and reliable motor-assisted turbocharger for internal combustion engines includes an assisting electric motor, a combination flow turbine wheel which may be inserted and removed from the turbocharger assembly through the exhaust opening of the turbine casing, and a divided volute turbine casing designed in a unique way so that the tips of the turbine blades can be extended to be closely adjacent to the turbine casing divider wall without complicating the mechanical design of the turbine, thereby providing an economical assembly with high-turbine efficiency compared with conventional, radial turbines used in turbochargers, and by providing in preferred embodiments, improved bearing support for the shaft, including reliable, stable shock- and vibration-resistant, high efficient, simple and economical bearing systems that are insertable and, permit inexpensive manufacture, maintenance, and repair of the turbochargers in which they are used.

대표청구항 ▼

[ We claim:] [1.] A motor-assisted turbocharger for an internal combustion engine including a charge air compressor adjacent one end and an exhaust gas turbine adjacent the other end comprising:a compressor wheel at the compressor end of a rotatable shaft, and a turbine wheel having central core and

[ We claim:] [1.] A motor-assisted turbocharger for an internal combustion engine including a charge air compressor adjacent one end and an exhaust gas turbine adjacent the other end comprising:a compressor wheel at the compressor end of a rotatable shaft, and a turbine wheel having central core and plurality of outwardly extending blades at the turbine end of the rotatable shaft;a bearing system for said rotatable shaft including a first roller bearing, a second sleeve bearing axially spaced from said first roller bearing, and a thrust bearing;a housing supporting said bearing system,said first roller bearing having an inner race engaging said rotatable shaft, an outer race and a plurality of roller bearings interposed between said inner race and outer race, said outer race extending axially from said inner race and providing, at its distal end, said second sleeve bearing, said outer race having an outer bearing surface and radially extending thrust bearing surfaces adapted to be rotatably carried by, and free to rotate within, said housing;an assisting electric motor adjacent said compressor wheel and a compressor casing at the compressor end of shaft turbocharger for receiving compressed air for the compressor wheel; anda meridionally divided volute for exhaust gas surrounding the turbine wheel and defining a turbine wheel opening permitting exhaust gas from said volute to act on the outwardly extending blades of the turbine wheel, said meridionally divided volute at its turbine wheel opening including a first side directing exhaust gas into the turbine wheel in a direction generally axially into the turbine wheel and a second side directing exhaust gas generally radially into the turbine wheel.