MODULE IV Steering & Suspension - M V E I T S LE Y U S D N O I MO S N E P S U S G N I R E E ST CIJIL B JOHN Asst Professor Dept of ME JECC Course

MODULE IV Steering & Suspension - M V E I T S LE Y U S...

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MODULE IV STEERING & SUSPENSION SYSTEM CIJIL B. JOHN Asst. Professor Dept. of ME, JECC
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Course Plan Steering & suspension : Different steering mechanisms – power steering – suspension systems – front axle, rigid axle & independent suspensions- anti roll bar- coil spring & leaf spring- torsion bar- Macpherson struct shock absorber- steering geometry- caster, camber, toe-in, toe-out. Types of wheels : Integrated rim- flat base rim alloy wheel- wheel balancing Tyres: Tubeless tyres- ply ratings- radial tyres .
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Steering system Primary function : to achieve angular motion of the front wheels to negotiate a turn. This is achieved through linkages & steering gear which convert the rotary motion of the steering wheel into angular motion of the front road wheels. Secondary functions are; 1. Provide directional stability of the vehicle when going straight ahead. 2. Provide perfect steering condition. i.e, perfect rolling of all wheels at all times. 3. Facilitate straight ahead recovery after completing a turn. 4. To minimize tyre wear.
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Requirements of a good steering system 1. Steering system should be very accurate & easy to handle. 2. Effort required to steer should be minimal & must not be tiresome to the driver. 3. Steering mechanism should provide directional stability. The vehicle should have a tendency to return to its straight ahead position after turning.
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Front Axle Till recently, all vehicles were steered by turning the front wheels in the desired directions, with the rear wheels following. Conventionally, the front axle was a dead axle, but these days, it’s true for heavy vehicles only. For 4WD vehicles & most of the cars, front axle is a live axle. In case of a dead axle, the front axle beam is usually drop forged steel – 0.4% C or 1.3% Nickel steel – no more used in modern cars. Front axle has to take bending loads due to weight of the vehicle & torque loads due to braking of the wheels. For this reason, front axle is made of I- section in the centre portion, while the ends are made circular or elliptical. A downward sweep is given to the centre portion to keep a low chassis height.
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Front Axle Tie Rod Front Axle Kingpin Stub Axle Main axle is connected to the stub axles by means of king pins. The front wheels are mounted on these stub axles.
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Stub Axles Reversed Elliot type- most common. Stub axles; made of 3% Nickel steel & alloy steels containing Chromium & Molybdenum
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Wheel Alignment Positioning the steered wheels in order to achieve the following is termed wheel alignment. Directional stability during straight ahead position. Perfect rolling condition on steering Recovery after completing the turn. Three different types of alignments can be done. 1. The front-end alignment – front axle’s angles are measured & adjusted.
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  • Fall '16
  • MR BIJU CV
  • Steering, steering wheel, camber, Ackermann Steering, Steering & Suspension, steering linkage

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