Sharing the load- friction and dowel pins 1

[BobM3]

I'm going to bolt a bearing block to a gear housing. The block will see a thrust load. I can't provide enough bolts to generate the clamp load needed to ensure that friction between the block and housing will react the thrust load. So I'm thinking of adding some dowel pins to help. The dowel pins will provide some shearing reaction force. I'm struggling with the load sharing between the two. I'm afraid the friction will react all of the load until there is slippage and then the pins will react all the load. When that happens the bearing block will have moved some amount. Does anyone have any experience with joints like these? The bearing block and housing are both aluminum.

 

[byrdj]

how about body fitted studs?

 

[cbrn]

Hi,
I may have missed something but it seems no reply has been made to the suggestion about increasing friction between parts.
Alu vs. alu can achieve a maximum of 0.3 coefficient of friction; there are several commercial ways to increase it up to at least 0.5: silicium carbide deposition, for example, or sheets of carbide which can be 0.02 mm thick... Of course the point is if this kind of solution is acceptable from a cost point of view...

Regards

 

[BobM3]

If I could get it to .5 I'd be in good shape. Are there any articles out there on the silicium carbide deposition and its effect on friction?

 

[Tmoose]

"I'm going to bolt a bearing block to a gear housing. "
"My aluminum block is similar to a pillow block bearing."

Is the gear housing aluminum too? Regardless, the contact face can be a mighty weak link. Aluminum joints subject to bending or side loads (should) make their designers worry about shuffling. To fight shuffling and fretting elaborate interlocking serrated features are applied to resist shuffling. Straight serrations are typical. The onoly pictures I could find are for interesting circular serrations

http://www.dragraceusa.com/images/shoptours/MGPRods/MGPRodsILSWeb.jpg