TRI 4link
05-22-2007, 08:39 PM
#21
Registered User
wrong. with a "wishbone" style upper, the bolt needs to be vertical because there is side to side force on the joint as well as front to back. since its an upper, there is little chance it will see up/down forces.
with two separate triangulated uppers (assuming 40* or more triangulation) the side to side forces of the axle are redirected and the joints see only front to back forces relative to the link itself, not the vehicle as a whole. with triangulated uppers, it doesnt matter how the joints are mounted as long as they do not bind during flex.
with two separate triangulated uppers (assuming 40* or more triangulation) the side to side forces of the axle are redirected and the joints see only front to back forces relative to the link itself, not the vehicle as a whole. with triangulated uppers, it doesnt matter how the joints are mounted as long as they do not bind during flex.
Where do you think the side to side forces are "redirectly" in the case of two uppers ?
The uppers, in the case of a triangulated upper with no trackbar, act to register the axle, side to side, regardless if there is a single joint at the diff or two joints. It's the same thing.
Take a "wishbone" style triangulated upper (one joint over the top of the diff) and make it joints with basically no separation betwen them.
Exactly the same thing, same forces.
Fred
05-26-2007, 11:05 AM
#22
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in the above (crappy) schematic, you see a typical wishbone upper 3 link. the red arrow represents a side load on the axle as a whole and the green arrows represent the forces seen by the wishbones parts. note that the joint at the axle sees all of the side load from the axle.
in yet another (crappy) schematic, we have a typical 4 link with triangulated uppers. once again, the red arrow is a side force on the axle. here we can see that all the joints on the upper links are in either a tension or compression load, not a side load.
needless to say the 4 link is far superior. not only is it by design stronger, but should one of the upper links fail, you can still drive on it.
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