Stabilizer Bar Bushing Radial Rate Testing Procedure

[kingtr]

I was wondering if anyone is familar with a procedure or specification for the testing of stabilizer bar bushing radial rates? I am trying to develop a "crude" benchtop test using a torque wrench to try and compare the radial rates of different types of rubber stabilizer bar bushings. I am specifically looking for the angular displacement that is typically used to calculate the radial rate. Based on information that I have seen on various OEM stabilizer bar drawings, I am expecting it to be somewhere in the 15 to 25 degrees range. Any input would be appreciated.

 

[GregLocock]

You are talking about the torsional rate, not the radial rate. I'd take it to full deflection each way three times before measuring the torque vs angle. 15-25 degrees sound sabout right. You need to use the correct bracketry if you want an accurate answer.

The radial (typically vertical) rate is also important, in that it affects your roll rate.





Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[kingtr]

You're correct - I meant to write "torsional" instead of "radial" rate.
The current fixture that I am working with will only allow rotation in the clockwise direction. Do you think it will have an appreciable effect on the results if the bushing is only preloaded 3X in the clockwise direction instead of full deflection in both directions?

 

[GregLocock]

Sorry, I don't know. I wouldn't bother rebuilding the rig until you find out how important the effect is. Bear in mind that the torsional stiffness of the D block acts as a conventional spring, that is it increases both the roll rate and the ride rate. Also bear in mind that many manufacturers use a slippy bush that allows the stbar to rotate wrt to the D block, so its torsional rate has no effect.




Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.