BorgWarner is currently developing a so-called thin-walled turbine housing. This design will significantly decrease the weight and the thermal inertia of the turbine housing. When the engine is cold started, the catalytic converter can be quickly activated, thereby greatly reducing the emission of harmful gases.
As other selected steel and casting of turbine housing
To reduce the weight of the turbine casing and the thermal inertia of the other two promising solution is to use steel plates and precision casting to manufacture the turbine casing. Steel turbine housing is put a few stamping of steel welded together. This turbine housing may be single wall, double wall construction can also be insulated with an air gap.saab 9-3 turbocharger It is connected to the engine exhaust system and have similar flexibility: it may be connected to the flange, or the adjacent exhaust pipes are welded together. This will allow the cylinder head to the catalytic converter from the exhaust gas flow to obtain a continuous air gap insulation. This thermal plate material can withstand up to 1050 ℃ exhaust temperature. Initial tests have verified that this turbine housing has a very low thermal inertia. Further, the cast steel turbine housing having a turbine housing with the same performance in terms of efficiency and flow capacity.
A variety of materials may be suitable for precision casting of the casting shell, and usually can withstand exhaust gas temperatures up to 1050 ℃. Casting turbine shell wall thickness can be reduced by more than 50%. Like and steel turbine housing, precision casting turbine casing has a small weight and low thermal inertia characteristics. Compared with the steel turbine housing, the turbine housing casting more readily incorporated within the bypass valve housing.
In addition to the turbine housing, exhaust gas temperature of the turbine wheel and bearing the body also have higher requirements. Borg Warner in this area can provide a suitable solution.
Turbine impeller and bearing body
Needed by the turbine impeller with a higher quality material.saab 93 turbocharger Future material must have at least the same creep strength at higher temperatures.
In addition, the thermodynamic properties of the turbine wheel and not because the use of this new material and suffered a loss. BorgWarner system adapted to 1050 ℃ high temperature turbine wheel is melting and casting in a vacuum from a nickel-based alloy with a high-temperature strength of manufactured. The maximum temperature occurs on the turbocharger between the turbine housing and the bearing body. Since the heat flux 1050 ℃, the water cooling of the bearing body to be improved. Bearing the body of the water channel is increased, and design of piston rings seat closer to the site. As the water is located at the highest point of the coupling portion of the bearing body, the vapor bubbles can thus be removed easily. Continuous selection ensures that the clamp body between the bearing and the turbine housing, even at high temperatures has a secure connection.
The latest generation turbo system from BorgWarner to meet future requirements for higher turbocharged gasoline engine to provide customers with a variety of petrol engine application solutions. The first generation of turbochargers top models currently used in the Volvo T5 S40 / V50's. BorgWarner turbocharger provides world-leading systems for passenger cars, commercial vehicles and industrial, locomotive and marine marine engines.
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