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Car cornering: side force between external and internal tire

  1. Jan 24, 2014 #1
    Hi all,

    During steady state cornering which tire of the same axle experiences the higher side force? I believe the external one for higher normal load due to the weight lateral transfer. Is it true?
     
  2. jcsd
  3. Jan 28, 2014 #2
    The wheel effectively travelling the furthest distance with being exerted to the most pressure, so yes, the outter (external) tyre.
     
  4. Jan 28, 2014 #3
    thanks a lot
     
  5. Jan 28, 2014 #4

    cjl

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    I don't think that necessarily follows. The one experiencing the higher force should be the one with the higher load. Yes, on a symmetrical car, this will be the outer one due to weight transfer in the corner, but you could conceivably make a car with one side much heavier than the other, such that even when the heavy side was on the inside of a corner, it would still have a higher tire load than the outside. Then I would expect the higher cornering load on the inside tire.
     
  6. Jan 28, 2014 #5

    rcgldr

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    Homework Helper

    That would translate into a higher vertical load, but the original question is about side loads. One of the factors affecting side loads is "slip" angle, how much "inwards" is the orientation of the tire versus it's actual path. If there's "toe in", then the inner tire has less slip angle, if there's "toe out" (an effect of ackerman steering on street cars for tire wear, not for cornering performance), then the inner tire would have more slip angle (when not cornering near the limits of traction). I'm not sure about the combined effects of vertical load versus side load versus slip angle.
     
  7. Jan 29, 2014 #6

    Ranger Mike

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    In a left hand steady state turn you are dealing with lateral load transfer. This assumes the weight coming from the rear of the car and the cross weight has already shifted and been countered by the spring/ shock ( damper) and is not oscillating. Now in a left hand steady state turn the right front tire and right rear tire will have more load than the other two. Typically the right front is the most loaded but this depends upon where the engine is located..frt wheel drive Ft. engine. RWD Ft. engine RWD rear engine or ft. wheel drive rear engine.
    You are correct in that vertical load on a tire increases the tires ability to accept more load ..to a point..for more detail see race car suspension class posts on this forum
     
  8. Jan 30, 2014 #7
    1.Why would more slip angle during turns(toe-out) imply less tire wear?The rubber flexes more than it would in toe-in right?Wouldn't this imply more tire wear in toe-out? (in relation to the inner wheel).
     
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