Swing spring conversion
Posted By : Paul Carter, 14-May-2007, 09:55pm
aaron,
the idea of the swing spring is to allow some compliance of the spring relative to the roll of the chassis under a cornering situation.
basically what used to happen on the original fixed spring was as the car went into a corner the inside wheel would drop down at an alarming angle of positive camber so inducing the rear of the car to "jack up"creating the infamous axle hop which would throw the back end of the car out sometimes resulting in a spin.the swing spring was designed to prevent this situation by allowing the main leaf of the spring to pivot on a fulcrum arrangement on top of the diff casing so allowing the road wheels to maintain a more even
camber attitude relative to the road surface by keeping this main leaf more or less parallel to the road surface resulting in better road holding.it was a simple and cheap modification made by triumph during production and is quite effective.hope this enlightens you..
paul.
the idea of the swing spring is to allow some compliance of the spring relative to the roll of the chassis under a cornering situation.
basically what used to happen on the original fixed spring was as the car went into a corner the inside wheel would drop down at an alarming angle of positive camber so inducing the rear of the car to "jack up"creating the infamous axle hop which would throw the back end of the car out sometimes resulting in a spin.the swing spring was designed to prevent this situation by allowing the main leaf of the spring to pivot on a fulcrum arrangement on top of the diff casing so allowing the road wheels to maintain a more even
camber attitude relative to the road surface by keeping this main leaf more or less parallel to the road surface resulting in better road holding.it was a simple and cheap modification made by triumph during production and is quite effective.hope this enlightens you..
paul.
Swing spring conversion
Posted By : Charles Bushell, 14-May-2007, 10:10pm
The dreaded jacking & tuck under on the fixed spring car is caused by the sideways force on the outside rear wheel relative to the position of the
pivot (the uj) during cornering. This sideways force, generated by the grip of the tyre, is proportional to the weight on the wheel which is greater on
the outside wheel.
One way to reduce the likelyhood of tuck under would be to lower the car which would take the line of action of the force further away from the pivot. Another way would be to reduce the force on the outside wheel by sharing more of the force with the inside wheel, this is what the swing spring does. By allowing the spring to pivot, more of the weight of the car is taken by the inside rear wheel.
Obviously the weight on the outside front wheel increases to compensate, thats why you need to fit a stronger front anti-roll bar at the same time.
Hope that makes sense.
One way to reduce the likelyhood of tuck under would be to lower the car which would take the line of action of the force further away from the pivot. Another way would be to reduce the force on the outside wheel by sharing more of the force with the inside wheel, this is what the swing spring does. By allowing the spring to pivot, more of the weight of the car is taken by the inside rear wheel.
Obviously the weight on the outside front wheel increases to compensate, thats why you need to fit a stronger front anti-roll bar at the same time.
Hope that makes sense.
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Swing spring conversion
Posted By : Aaron Tucker, 15-May-2007, 10:05am
thanks to both of you i feel much more enlightened
clever physics really....and now i understadn why you need the
bigger/stronger anti roll bar too!
Much thanks
Aaron