Upload
stooty-s
View
6.497
Download
5
Tags:
Embed Size (px)
Citation preview
SDW 14/11/97© Holset Engineering Co Ltd
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
How does a turbocharger work ?
• The Turbine End • The Compressor End
• The Oil Supply
• The Piston Ring Seals
• Summary
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• The turbine housing is bolted to the exhaust manifold of the engine.
• The waste exhaust gasses are used to rotate a turbine wheel which is housed in the turbine casing.
• The turbine wheel is connected to a common shaft which in turn rotates a compressor wheel.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• Rotating the turbine wheel is the only use for the waste exhaust gas.
• Once the gas has passed through the blades of the wheel it leaves the turbine housing via the exhaust outlet area.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• As more gas passed through the turbine housing, the faster the turbine wheel rotates.
• As the turbine wheel increases in speed, so does the compressor wheel. This creates a sucking process and pulls air into the compressor cover from the atmosphere (filtered)
• The faster the wheels spin the, the more air is sucked in.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• As the air is sucked into the compressor cover, it is forced through a diffuser area.
• This compressors the air and forces it into the engine
• This process causes the air to increase in temperature, sometimes up to 200 degrees C
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• Front Wheel Clearance affects the performance of the turbo.
• The smaller the FWC the better the performance.
• The Compressor Wheel Bore must be machined to tolerance / drawing.
• Over sized bore will affect the balance of the turbocharger. Compressor Wheel
Profile
Compressor CoverProfile.
Compressor Wheel Bore
F W C
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• The oil used in a turbocharger is the same as that used for your engine.
• The oil is used as both a lubricant and a coolant.
• It is fed under pressure into the bearing housing, through to the journal bearings and thrust system.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• The Journal Bearings are a free floating rotational type.
To perform correctly, the journalbearings should float between a filmof oil (i.e. between bearing & shaft,& bearing & bearing housing.)
• Dirty oil, or blockages in the oil supply holes can cause serious damage to the turbocharger.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
• Piston Ring Seals, can be found at both ends of the turbocharger
• They are designed to keep the exhaust pressure out of the bearing housing, and the air pressure out of the bearing housing.
• The surface finish on both Turbine & Compressor end bore must be smooth and score free.
SDW 14/11/97© Holset Engineering Co Ltd
Holset Product TrainingHolset Product TrainingHow A Turbocharger WorksHow A Turbocharger Works
Summary • What is the function of the Turbine Housing ?
• What is the function of the Compressor Housing ?
• What is the function of the oil in the turbocharger ?