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Chap 4 Wheels and Tyres

Chap 4 Wheels and Tyres - Lecture Note Chap-4:Wheels and...

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Lecture Note Chap-4:Wheels and tyres Motor Vehicle Engineering MEng 5165 By: Shewangizaw W.
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4. WHEEL AND TYER
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4.1 Introduction The wheel, along with the tyre has to take the vehicle load provide a cushioning effect, and cope with the steering control. The various requirements of an automobile wheel are:- 1. It should be lightest possible so that the unstrung weight is least. 2. It should be balanced both statically as well as dynamically. 3. It should be possible to remove or mount the wheel easily. 4. Its material should not deteriorate with weathering and age. 5. Good ability of heat dissipation (frictional braking heat).
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4.2 Tyre It consists of mainly the outer cover and the inner tube. The tyre tube assembly is mounted over the wheel rim. It is the air inside the tube that carries the entire load and provides the cushion. The tyre performs the following functions; 1. Supports the vehicle load. 2. Provides cushion against shocks. 3. Transmits driving and braking forces to the road. 4. Provides cornering power for smooth steering.
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4.2.1 Tyre Construction (I) Carcass (casing): The carcass is the frame work of the tire, it must be rigid enough to hold in the high pressure air, yet flexible enough to absorb load changes and impact. It consists of layer of tyre cords bonded together with rubber. Tyres are generally classified, according to the direction of the cords, into radial-ply and bias ply types.
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(II) Tread, (III). Side Walls, (IV). Breaker, (V). Belt (rigid breaker) and (VI). Beads:
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4.2.2 Desirable Tyre Properties (i). Load carrying: The tyre should be able to carry the weight of the vehicle and its occupants without distortion. The tyre material should resist bending, tensile, compressive and tensional stresses some of which come up during steering and braking. (ii). Cushioning: It should absorb the shock loads caused due to road irregularities and damp the vibrations fast. (iii). Uniform Wear: The tyre should not develop skidding even on wet roads. Uniform wear reduces tyre skid and vibrations due to road irregularities. (IV). None skidding: The tread pattern design must be such that the tyre not skids much on wet roads. The rubber must have a high coefficient of friction. (V). Power consumption: The tyre must have a lower rolling resistance and therefore must consume least of the
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Cont… (VI). Noise: Tyre noise should be minimum. This depends upon the tread pattern and type of road. (VII). Balance: The tyre should be statically and dynamically balanced or else this may give rise to wheel wobble.
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