Alignment Fundamentals, Part Two - PowerPoint PPT Presentation

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Title:

Alignment Fundamentals, Part Two

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Alignment Fundamentals, Part Two Steering Axis Inclination (SAI) The inward tilt at the top of the strut. (looking from the front) SAI and Included angle Include ... – PowerPoint PPT presentation

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Title: Alignment Fundamentals, Part Two


1
Alignment Fundamentals, Part Two
2
Steering Axis Inclination (SAI)
  • The inward tilt at the top of the strut.
  • (looking from the front)

3
SAI and Included angle
  • Include angle
  • SAI pos. camber

4
SAI and Bump steer
Zero SAI would Major bump steer
5
0 Bump Steer
  • SAI line meets tire vertical CL at road surface
  • Tire wear reduced
  • Steering effort decreased
  • Less stress on components

6
SAI Safety Factors
  • Unequal causes serious handling problems
  • Torque steer
  • Pulling during braking
  • Bump steer
  • If SAI is out of spec
  • Camber will be out of spec
  • Bent or damaged components

7
Scrub Radius
  • Distance between SAI line True Vertical CL of
    tire at road
  • Positive scrub radius SAI line meets road
    inside CL of tire
  • Negative Scrub Radius SAI line meets road
    outside CL of tire

8
Pos. Scrub Radius
9
Negative Scrub Radius
Commonly used on front wheel drive vehicles
10
Toe
  • The distance between the inside front edges and
    the inside rear edges of the tires
  • Wears tires with a feathered edge
  • Toe-out-on-turns inside wheel at sharper angle
    that outside

11
Toe In Out
12
Turning Radius Toe-Out-On-Turns
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