Suspension braket (clevis tab) orientation.

[Shashi]

Hello all.

I was trying to figure out the orientation of the clevis tab usually employed as the A - Arm pick up point on the chassis.

What I concluded from the "To Win" series, a weld should preferably be employed in shear. So if the A-Arm mounts are oriented to be perpendicular to the longitudinal plane of the chassis, the mount interface with the chassis member experiences shear and part of the load is transmitted to the chassis member. In case the mount is mounted parallel to the A - Arm link, the weld interface is subjected to alternate tension and compression during service conditions. Here, all of the force experienced will be transmitted through the linkages and into the chassis members.

Requesting comments.

Regards.

[Shashi]

Hello all.

I was trying to figure out the orientation of the clevis tab usually employed as the A - Arm pick up point on the chassis.

What I concluded from the "To Win" series, a weld should preferably be employed in shear. So if the A-Arm mounts are oriented to be perpendicular to the longitudinal plane of the chassis, the mount interface with the chassis member experiences shear and part of the load is transmitted to the chassis member. In case the mount is mounted parallel to the A - Arm link, the weld interface is subjected to alternate tension and compression during service conditions. Here, all of the force experienced will be transmitted through the linkages and into the chassis members.

Requesting comments.

Regards.

[Adambomb]

Hey, this was a good post, nobody else replied yet???

So if I'm getting it right, your concern is that ideally, welds should be in shear, but with a standard double-shear tab setup the welds will be in tension and compression. Good assessment, honestly I've never really thought of optimizing it that way before.

If the welds are good, you shouldn't have much to worry about. It may not be ideal to load the welds in tension/compression, but as long as there is enough weld area and you have a skilled welder you shouldn't have any problems.

[The_Man]

Interesting observation there. I would think though if you have the wishbone mounts' welds in shear as explained by Shashi then there is one issue I can see. If the design has even small anti-dive/squat characteristics then the rod ends at the ends of the wishbones will be in bending during any pitching movement(brake test). I'm sure if your welds are of decent quality the rod end will fail before any of the welds will.

Mahek Mody
IIT Bombay Racing