Wheels and tyres pages 8 and 9
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Transcript of Wheels and tyres pages 8 and 9
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Wheels and tyres
Pages 8 and 9
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Objectives All of you will:• Identify, name and label components associated with
tyre pressure monitoring, hub bearings and run flat tyres
Most of you will: • Explain the operation of components associated with
tyre pressure monitoring, hub bearings and run flat tyres
Some of you will:• Predict symptoms of worn or damaged components
associated with tyre pressure monitoring, hub bearings and run flat tyres
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Tyre pressure monitoring systems (TPMS)
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There are two main types of TPM systems in use today, one system
uses the ABS system and the other uses a series of sensors fitted to the inside of the tyre rim and a
receiver unit nearby.
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Describe with the aid of a drawing how the ABS operated TPM
system works:
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• As the ABS system monitors wheel speeds if the speeds are different the ECU can recognise that the wheel circumference is smaller – signifying a flat tyre
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What should be observed when working with the system shown below?
• This is called ‘direct tyre pressure monitoring’
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• Direct tyre pressure monitors have sensors fitted to the inside of the wheel rims (part of the valve).
• They can be easily damaged when replacing tyres
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There are two main types of run flat tyres.
State the difference between the two main types:
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• One type is known as a self supporting run flat. This type has a thicker sidewall to enable the strength to support the weight of the vehicle in the event of a puncture.
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• The other type is an auxiliary supported run flat tyre. They use an additional support ring inside special wheel rims.
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Some manufacturers supply a space saver tyre instead of a full size spare today, why are space
savers used?• To save space in the boot, especially if the
‘real’ wheels are wide. • They would probably save the manufacturer
money too.
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What needs to be observed when using a space saver tyre?
• There are speed and distance restrictions placed on the space savers.
• i.e. how far and how fast you can drive
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It is common for a hub to be supported by two hub bearings, an
inner and an outer.
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Name the different types of bearing than are in use:
• Ball bearings • Double ball bearings • Roller bearings • Taper roller bearings • Double taper roller bearings
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Label the bearings:
• Double ball bearing
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Taper roller bearing
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• Roller bearing (parallel roller)
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• Double taper roller bearing
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What is the difference between a plain bearing and a roller bearing?
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Roller
• A bearing that uses cylindrical rollers in between the inner and outer race
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Plain bearing
• A plain bearing has no rolling components. The load can be spread over a broad area which means great loads can be supported.
This is a plain bearing
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What is the difference between axial and radial loads?
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Radial loading
• It is load applied to a bearing or shaft at 90 degrees to the bearing or shaft
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Axial loading
• Axial loading is load applied to a bearing along its axis.
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How is a hub bearing checked for wear?
• The weight is removed from the bearing• The bearing is checked for wear both radially
and axially by manipulating the hub and feeling for play.
• Play can be measured using a DTI• Road test and listen for noise when cornering
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Objectives All of you will:• Identify, name and label components associated with
tyre pressure monitoring, hub bearings and run flat tyres
Most of you will: • Explain the operation of components associated with
tyre pressure monitoring, hub bearings and run flat tyres
Some of you will:• Predict symptoms of worn or damaged components
associated with tyre pressure monitoring, hub bearings and run flat tyres