Threaded flange affixing

[Tpintar]

I have a question regarding affixing a threaded flange to a shaft.

The flange is the end element of a hydraulic cylinder transfering the axial force. The flange and shaft have a threaded connection.

My question is related to the method fixing the flange in position on the thread. Currently the idea is to use a pin as illustrated in the very crude sketch accompanying the post. (If it´s unclear I can make a more precise sketch but I have nothing better than paint on hand at the moment)

What worries me is that I have never seen an example of such a connection, and I´m doubtfull a pin can be used to secure a threaded connection.

The connection is mainly loaded axially with very little tangential stress, and must be easy to dismantle. The axial forces are approximately 100 tons. I have tried searching the forum and internet in general bu I am apparently asking the wrong question. I would be grateful on any advice given.

 

[StoneCold]

Why don't you delete the threads and turn down the end of the shaft. Then add a small hub to the flange that would mate up against the shoulder where the shaft was turned down. Then use the pin just to take the tangential loading. Then you don't have the complications of the threads and you can easily figure out the load on the shoulder of the shaft.

By the way I am a chemical engineer so I might be way off on this.


Regards
StoneCold

 

[Tpintar]

Ok, but suppose I really have to work with a threaded connection.

 

[MintJulep]

The ID of the flange is threaded to match the end of the shaft?

I can't make much of your sketch.

How about just a jam nut?

 

[Tpintar]

Yes.. the flange and shaft have corresponding threads.

I was also thinking of using a locking nut, it seems a logical solution.

Along that line is there a way to quantify the safety provided by the locking nut.

But just for future reference does anyone know if it is even possible to use something like a safety pin for securing a threaded connection.

 

[MintJulep]

Were you thinking of attempting to drill a hole that's half in the shaft and half in the flange, then drive in a roll pin or a solid pin?

It can be done, but:

It's hard to do.

It's ugly.

It's a custom match, and if it ever does get taken apart it won't line up again.

 

[Tpintar]

Thanks.