bushing/shaft chart 1

[JrEngJP]

I'm specifying a bushing for a 6" dia x 11.75" S7 steel pin that will take a 300 ton load (mounted on the end of a large hydraulic cylinder) and I was wondering if anyone out there has come across a standardize chart for bushing types with varying loads. The machinist handbook only goes to 1". The bushing will likely be mild steel, however I'm not sure what OD would be best for such a load and if applied stress over a given surface area will have an impact on life.

Thanks in advanced

JP

 

[unclesyd]

first off I've never seen a S7 pin in this type application before. I hope there is no shock load as a normal bushing would go out the window

Could you the forum why the S7

You might want to look at links below to give you some idea of the size required. The first link is to CRC who is now Hydrotech
they build very large hydraulic cylinders.
The second link is to CRC Component Parts catalogue to see what's available.

http://www.solidcomponents.com/comp...CCRG47OM&VisualID=22832&Lang=44&ClickLog=lang

http://www.crconline.com/Components/catalog.html

 

[JrEngJP]

Unclesyd,

Thanks for the links. Unfortunitely the calculator wont let me specify the cylinder I need. 12" ID X 164" Stroke, 345 bar. There isn't a shock load and very little rotation (no more than 3 degree's). We've used S7 steel pins for some time on our cylinders and I'm just trying to figure out what size bushing (relative to pin diameter and applied force) to use. I'm not sure what to use besides a guess without data to back it up. Thanks in advanced for your help.

JP

 

[tr1ntx]

I've seen DOM HSLA tubing used for such large bushings on hydraulic cylinders applications before. Not sure about the loading/duty-cycle (they were ag/off-road construction equipment). I've seen 1/4", 3/8" and 1/2" wall used.

 

[unclesyd]

Sorry about that it seems that the new owners don't have the same design tool as the old CRC Mfg site. You might give "crconline"a RFQ. I don't have a contact at either place any more. I will make a few calls to see if anyone has any contacts there.
CRC Mfg. built some awfully large cylinders and if you look at
the Applications section on the Hydratech web page the pictures
are from the old CRC Mfg.web page.

Here are two sites that may help. The RBC site has high spherical.Spherical bearings. The Connex site is for spring steel tension bushings. They may go to 6" as they only list 5.5"

http://www.hydratechglobal.com/en/portfolio.html

http://www.rbcbearings.com/sphericalplainbearings/index.htmhttp://

http://www.connexusa.com/HTML/examples.html