Does anyone know the aproximat coeffiecnt of friction for a rubber belt on a steel or aluminim pully? It should be nearly and ideal surface.

 

Belt to pulley is usually calculated at 95-97% efficient - depending on the the style of the belt and pulley, the tension being correct and the HP/TQ being transferred appropriate to the belt.

There are about a billion ways to combine different surface finishes and different belts. They would all have a slightly different Cf. Depends on what the design goal is.

If you are looking at power transfer, belt manufacturers rate the belts in HP. There are many different solution sets, it depends on what the design parameters of the problem to solve are.

Greg

 

ViribusUnits... what's the 'wrap' angle? i.e. how many degrees around
is the belt in contact with the pulley? Most data assumes 180; derate
efficiency about 3 to 4 % per every 10 deg less than 180, to 90.
(The Cf for 'normal' v-belt on steel = 0.27)

G'luck.

 

Thanks.

Cf stand for?

 

ViribusUnits... Cf is "coefficient of friction", IMO, IIRC, TAF.

Enjoy your day (I did; I had the 'shark' on the road).

 

I was wondering about this a while back too...

I was considering trying to make an external limited slip axle by having rubber belts over the inner CV joint bodies, connected to a shaft running under the transaxle.

The amount of slip would be dependent on the grip (Cf) of the belts.

 

OK, I ususaly use "u", but with an extension below the first part of the "u", some sort of a Greek or Latin charator.

Porken, somehow that doesn't suprise me.