LEAF SPRING - PowerPoint PPT Presentation

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LEAF SPRING

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A leaf spring is a simple type of suspension spring commonly used in heavy duty vehicles. The advantages of leaf spring over helical spring is that the ends of the ... – PowerPoint PPT presentation

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Title: LEAF SPRING


1
LEAF SPRING
2
Introduction
  • A leaf spring is a simple type of suspension
    spring commonly used in heavy duty vehicles.
  • The advantages of leaf spring over helical spring
    is that the ends of the spring be guided along a
    definite path as it deflects to act as a
    structural member in addition to energy absorbing
    device.

3
Types
  • Double eye
  • Slipper-open eye end
  • Slipper-hook end
  • Slipper-flat end
  • Slipper-radius end

4
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5
Construction of leaf spring
  • Leaf springs used in automobiles is of
    Semi-Elliptical in form.
  • It is built up of number of plates(known as leaf)
    , which are of reducing lengths.
  • The longest leaf is called main leaf or Master
    leaf, And the other leaves are called as
    graduated leaves.
  • The spring is clamped to the axle by means of
    U-bolts.
  • Rebound clips are used to hold the leaves
    together.
  • Central clamp is used to fix the position of leaf
    spring to the wheel axle.

6
Construction of leaf spring
7
Parts of leaf springs
8
Manufacturing process
  • The different types of manufacturing process
    involved are
  • Shearing of flat bar
  • Center punching
  • End Heating process forming (hot cold process)
  • Heat treatment
  • Surface preparation
  • Eye bush preparation process
  • Assembly

9
Standard sizes of leaf spring
  • Width (mm) 25-80 mm in steps of 5mm
  • Thickness (mm) 2-8 mm in steps of 1mm, 10-16 mm
    in steps of 2mm

10
Material Used for Leaf Spring
  • The materials used for leaf springs is usually a
    plain carbon steel having 0.90 to 1.0 carbon.
  • According to Indian Standards the Recommended
    Materials are
  • For Automobiles 50 Cr 1 , 50 Cr 1 V 23
    , 55 Si 2 Mn 90 , used in
    Hardened and Tempered state.
  • For Rail Road Springs C
    55(water-Hardened , C 75-Oil hardened) , 40
    SI 2 Mn 90 (Water Hardened) and 55 Si 2 Mn 90
    (Oil hardened)

11
Leaf Spring Design
  • Bending Stress in each plate of the leaf spring
  • B 6WL/(nbt 2)
  • Deflection of the plate
  • d4WL 3/(nEbt 3)

12
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13
Composite carbon fibre leaf spring
  • Now-a-days industries are trying to reduce
    the weight and increase the strength of leaf
    spring for efficient suspension.
  • ARC Composite carbon fiber is the best
    material suitable for the above required
    criteria.
  • This material has less weight and high
    strength when compared to the materials using in
    the leaf springs using in nowadays leaf springs.

14
Advantages of ARC Composite carbon fibre leaf
spring suspension
  • 1) Specifically made to give effects like Air
    Suspension with out any extra external
    energy(Fuel)2) No permanent deformation hence
    no re-cambering, thus no maintenance.3) Minimum
    wear and tear of body parts and tyre due to
    delicate tendency of absorbing road shocks, jerks
    and vibrations.4) Softer ride, Lower noise
    level, excellent stability due to better damping
    characteristics.5) Excellent corrosion
    resistance against atmospheric pollutants.6)
    Five times stronger than conventional metal leaf
    springs.

15
  • 7) Fully interchangeable with the
    conventional spring without any
    modifications.8)Increase in fuel efficiency due
    to better aerodynamics and around 60 weight
    reduction.9) No cracking sound since mono leaf
    and hence no inter-leaf friction and no greasing
    required.10) Fatigue life 1 million cycles as
    compared to only 2 lacks for the metal leaf
    springs.

16
THANK YOU
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