Peaucellier-Lipkin linkage
09-16-2009, 12:22 AM
#1
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Peaucellier-Lipkin linkage I was reading about suspensions today, just for fun, and I found something cool that might be useful...
We know the the stock F-body has a Panhard bar to center the rear axle laterally (left to right).
http://en.wikipedia.org/wiki/Panhard_rod
The Watts link is an improvement over the Panhard bar; the Watts link follows a path that is closer to a vertical line than the path which the Panhard bar follows. However, the Watts path isn't quite straight -- it curves away from vertical at the top and bottom of its path. Strano sells a Watts link for the F-body.
http://en.wikipedia.org/wiki/Watts_link
http://www.stranoparts.com/partdetai...D=67&ModelID=7
The Mumford link is an improvement over the Watts link; it gives control over the roll center. I don't know if any production cars have these, and I don't think there is one available for the F-body.
http://www.not2fast.com/chassis/mumford.shtml
This is the linkage I discovered today while reading about Watts links. This type of link traces a mathematically perfect [vertical] line. I wonder if it could be adapted for solid axles like the F-body's rear suspension. I welcome any mad scientists and fabricators to build a working suspension using this design and share their findings with us :-)
http://en.wikipedia.org/wiki/Peaucellier-Lipkin_linkage
http://kmoddl.library.cornell.edu/tutorials/11/
There are 2 other linkages that I haven't really looked at yet, called Hart's linkage and Hart's A-frame. More information:
http://www.howround.com/ (click on "how to draw a straight line")
We know the the stock F-body has a Panhard bar to center the rear axle laterally (left to right).
http://en.wikipedia.org/wiki/Panhard_rod
The Watts link is an improvement over the Panhard bar; the Watts link follows a path that is closer to a vertical line than the path which the Panhard bar follows. However, the Watts path isn't quite straight -- it curves away from vertical at the top and bottom of its path. Strano sells a Watts link for the F-body.
http://en.wikipedia.org/wiki/Watts_link
http://www.stranoparts.com/partdetai...D=67&ModelID=7
The Mumford link is an improvement over the Watts link; it gives control over the roll center. I don't know if any production cars have these, and I don't think there is one available for the F-body.
http://www.not2fast.com/chassis/mumford.shtml
This is the linkage I discovered today while reading about Watts links. This type of link traces a mathematically perfect [vertical] line. I wonder if it could be adapted for solid axles like the F-body's rear suspension. I welcome any mad scientists and fabricators to build a working suspension using this design and share their findings with us :-)
http://en.wikipedia.org/wiki/Peaucellier-Lipkin_linkage
http://kmoddl.library.cornell.edu/tutorials/11/
There are 2 other linkages that I haven't really looked at yet, called Hart's linkage and Hart's A-frame. More information:
http://www.howround.com/ (click on "how to draw a straight line")
09-16-2009, 10:46 AM
#2
The Fays2 Watts link gives control over your Roll center height. It's adjustable for RC height.
There are no worries about the axle moving to the side at the extremes of travel, we don't have that much wheel travel. Between the length of the arms, and when the bellcrank is properly positioned the axle will move up and down until it's at full droop (which never happens when driving only on a lift and even then it's way, way, way less than a PHB).
Realistically the variation is a non-factor because you don't ever get there.
Also, consider that a Fays2 link is basically a bolt. In fact it is, it bolt to the existing PHB mounting locations, and some axle clamps. There are packaging concerns with the swaybars, exhaust and body as well that just don't allow you to do whatever one might wish.
There are no worries about the axle moving to the side at the extremes of travel, we don't have that much wheel travel. Between the length of the arms, and when the bellcrank is properly positioned the axle will move up and down until it's at full droop (which never happens when driving only on a lift and even then it's way, way, way less than a PHB).
Realistically the variation is a non-factor because you don't ever get there.
Also, consider that a Fays2 link is basically a bolt. In fact it is, it bolt to the existing PHB mounting locations, and some axle clamps. There are packaging concerns with the swaybars, exhaust and body as well that just don't allow you to do whatever one might wish.
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www.stranoparts.com --814-849-3450
18 SCCA National Championships in house, many more for our customers prove we know our stuff.Talk is cheap, results matter.
Check out our KONI prices, our Master Cylinder Brace, and new Xtracker Hub/wheel bearing upgrade kits!
