Abstract: A turbocharger (18) includes a shaft (20), a mixed flow turbine wheel (40) including a wheel hub (44) and blades having tips (42), and a heat shield (11). The heat shield (11) has a side wall, an end (19), and a contoured front edge (13) that connects the sidewall (16) and the end (19). The front edge (13) of the heat shield (11) defines a slope that forms an imaginary line that is angled relative to the sidewall (16) and the end (19), and intersects an axis of rotation of the shaft (20). The heat shield (11) resides at a position that is between a bearing housing (22) of the turbocharger (18) and the turbine wheel (40), and axially inward relative to an axially-facing surface of a turbine volute (24), and between the bearing housing (22) and the turbine wheel (40).

Abstract: A turbocharger (10) including a bearing housing (20), a shaft (40) mounted for rotation in the bearing housing (20), and a turbine wheel (34) attached to one end of the shaft (40) and configured to be driven by exhaust gas flow is disclosed. A heat shied (12) is also disclosed, the heat shield (12) being designed for positioning between the bearing housing (20) and the turbine wheel (34) of the turbocharger (10). The heat shield (12) may include a closed end wall (48) and a sidewall (46) extending from the closed end wall (48). The heat shield (12) may further include a center opening (54) in the closed end wall (48) that is configured to receive the shaft (40) of the turbocharger (10). Additionally, the heat shield (12) may include an outer layer (72) and an inner layer (76), and an insulation material (74) disposed between the outer layer (72) and the inner layer (76) of the heat shield (12), the outer layer (72) and the inner layer (76) encapsulating the insulation material (74).

Abstract: Turbocharger turbine wheels are designed to accelerate rapidly and to rotate at very high RPM. A turbine wheel is provided with improved low cycle fatigue resistance. The wheel can be balanced by conventional methods.

Abstract: A turbocharger (18) includes a shaft (20), a mixed flow turbine wheel (40) including a wheel hub (44) and blades having tips (42), and a heat shield (11). The heat shield (11) has a side wall, an end (19), and a contoured front edge (13) that connects the sidewall (16) and the end (19). The front edge (13) of the heat shield (11) defines a slope that forms an imaginary line that is angled relative to the sidewall (16) and the end (19), and intersects an axis of rotation of the shaft (20). The heat shield (11) resides at a position that is between a bearing housing (22) of the turbocharger (18) and the turbine wheel (40), and axially inward relative to an axially-facing surface of a turbine volute (24), and between the bearing housing (22) and the turbine wheel (40).

Abstract: Turbocharger turbine wheels are designed to accelerate rapidly and to rotate at very high RPM. A turbine wheel is provided with improved low cycle fatigue resistance. The wheel can be balanced by conventional methods.