Tire size characteristics

When suspension limits the width of the tire, for any iteration we have to change wheel diameter. So some points from the experts at Tread Hunter to be remembered while deciding wheel size. Bigger wheel increases resistance to bending, hence leads to increase in reliability. Bigger wheels lead to higher steering effort and decrease in […]

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Lateral and Tractive forces

Lateral forces This force (Fy) is acting on the tire centre which creates a moment, whose moment arm length is caster offset at ground. See fig. Lateral force depends on steer angle, cornering condition and with positive caster produces a moment attempting to steer the vehicle out of turn causing understeer. Net moment = ML […]

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Analysis of vertical force in steering system

Condition for Ackerman- δo = tan-1 [L/(R+t/2)] δi = tan-1 [L/(R-t/2)]   Error in steering Toe change- For an ideal steering system relay arm (tie rod) should follow the same arc as the suspension follows. Practically it is impossible to achieve due to nonlinearities in the motion of suspension. When the wheel moves in the jounce and rebound, […]

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Bump Steer Calculation

http://drc.libraries.uc.edu/bitstream/handle/2374.UC/663738/MET2012_jacobsj8_attempt_2012-05-31-23-07-35_MET2012_Jeremy%20Jacobs.pdf?sequence=1 http://www.pirate4x4.com/tech/billavista/PDFs/Bump_Steer_by_Longacre_racing.pdf

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