Bump steer is the term for the tendency of the wheel of a car to steer itself as it moves through the suspension stroke. Bump steer causes a vehicle to turn itself when one wheel hits a bump or falls down into a hole or rut. Excessive bump steer increases tire wear and makes the vehicle more difficult to handle on rough roads. For example, if the front left wheel rolls over a bump it will compress the suspension on that corner and automatically rotate to the left (toe out), causing the car to turn itself left momentarily without any input from the steering wheel. Another example, is that when most vehicles become airborne their front wheels will noticeably toe in.
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| - Bump steer (en)
- Bump steer (nl)
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| - Bump steer is een effect van onder andere naafbesturingen en telelever bij motorfietsen, waarbij het stuur draait door het inveren. Dit is soms moeilijk te onderdrukken, waardoor het moeilijk is een motorfiets met een goedwerkende naafbesturing te ontwikkelen. Het door BMW gebruikte Telelever-systeem is voorzien van een zogenaamde "tuimelontkoppeling", waardoor het effect achterwege blijft. (nl)
- Bump steer is the term for the tendency of the wheel of a car to steer itself as it moves through the suspension stroke. Bump steer causes a vehicle to turn itself when one wheel hits a bump or falls down into a hole or rut. Excessive bump steer increases tire wear and makes the vehicle more difficult to handle on rough roads. For example, if the front left wheel rolls over a bump it will compress the suspension on that corner and automatically rotate to the left (toe out), causing the car to turn itself left momentarily without any input from the steering wheel. Another example, is that when most vehicles become airborne their front wheels will noticeably toe in. (en)
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| - Bump steer is the term for the tendency of the wheel of a car to steer itself as it moves through the suspension stroke. Bump steer causes a vehicle to turn itself when one wheel hits a bump or falls down into a hole or rut. Excessive bump steer increases tire wear and makes the vehicle more difficult to handle on rough roads. For example, if the front left wheel rolls over a bump it will compress the suspension on that corner and automatically rotate to the left (toe out), causing the car to turn itself left momentarily without any input from the steering wheel. Another example, is that when most vehicles become airborne their front wheels will noticeably toe in. Rear suspension can be designed a number of ways. Many modern vehicles have rear suspension designs which are opposite of the front suspension: Toe in under bump, and out under droop. They can also be designed to have very little or no bump steer at all. Cars with rear live axles, also known as solid axles do not exhibit true bump steer, but can still cause some steering over one wheel bumps, see . If both wheels on a live axle move upwards by the same amount, they tend not to steer. The linearity of the bump steer curve is important and relies on the relationship of the control arms and tie rod pickup points, and the length of each part. As the suspension goes through bump and droop, each part follows an arc resulting in a change of effective length. Whichever parts are longest tend to have less change in effective length because their arc radius is longer. This is the determining factor in designed bump steer. Another factor that affects bump steer is bushing compliance and deflection and arm bending. During a turn, if some or all of the bushings deflect then their pickup points have changed If any of the arms and tie rods bend then their effective length will change resulting in a change of toe. (en)
- Bump steer is een effect van onder andere naafbesturingen en telelever bij motorfietsen, waarbij het stuur draait door het inveren. Dit is soms moeilijk te onderdrukken, waardoor het moeilijk is een motorfiets met een goedwerkende naafbesturing te ontwikkelen. Het door BMW gebruikte Telelever-systeem is voorzien van een zogenaamde "tuimelontkoppeling", waardoor het effect achterwege blijft. (nl)
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