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How to Attach Pulley to Hollow Shaft

How to Attach Pulley to Hollow Shaft

How to Attach Pulley to Hollow Shaft

(OP)
Any advise on how to attach a pulley to a hollow shaft?

Background info:

Shaft Material:  Steel (exact type not determined)
Pulley Type:  Synchronous Belt (14M 6.32" Pitch Diameter, 2000 RPM, 125HP, 315 ft-lbs TQ)
Shaft OD:  50mm
Shaft ID:  40mm

My initial thought is taper lock bushings (2517 Gates).  This puts a very high clamp pressure that can crush the shaft.  The other is welding, but the shaft materials that we want to use cant be easily be welded.

Any tips/tricks as to how attach said pulley?

Thanks alot.

RE: How to Attach Pulley to Hollow Shaft

Brazing ?

RE: How to Attach Pulley to Hollow Shaft

In my experience if taper locks won't work nothing else will.

However, loctite might be a less crushing way of handling this.

I assume you've actually stressed all this and it makes sense?

5mm wall thickness tube is an unusual choice for that job, I'd expect a solid shaft.

 

Cheers

Greg Locock

I rarely exceed 1.79 x 10^12 furlongs per fortnight

RE: How to Attach Pulley to Hollow Shaft

(OP)
The design requires a hollow shaft.  The wall thickness is variable, but as a starting point 40mm is used.

How much would a chemical bond like loctite increase the holding power?

RE: How to Attach Pulley to Hollow Shaft

Can't you use something like Ringfeder? They are interchangeable with Taperlock, but have less of a taper angle and, therefore, have a more sensitive adjustment.

RE: How to Attach Pulley to Hollow Shaft

The traditional lightweight aircraft way is with splines to carry the torque, and something else to carry the thrust.

You could bottle-bore the shaft, i.e., just make it locally thick enough to deal with the stress from the taper-lock.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: How to Attach Pulley to Hollow Shaft

I second the Ringfeder idea.  The keyless locking hub is made for an application like this.

RE: How to Attach Pulley to Hollow Shaft

I agree with Mike, splines for the torsion, and something else to accommodate the thrust.  Adhesives would be one option.  Loctite, 3M and Hexcel have technical information available on their websites.

RE: How to Attach Pulley to Hollow Shaft

Can you add a plug under the pulley? This would allow a number of options.

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