Fixing spline coupling to the spline shaft

[edison123]

I hope this is the right forum. If not, please guide me.

We have this 80 mm bore spline coupling which is to be fitted to a spline shaft. Both are shown below.

How do we fit this coupling to the shaft? When cold, the coupling goes up to about 1/3rd of the shaft length freely by hand and them gets tight.

We heated the coupling to 200 deg C but still cannot get the coupling all the way in.

What are we doing wrong?

Thanks for your tips.

Muthu

http://www.edison.co.in

 

[Screwman1]

Freeze the bloody shaft with liquid nitrogen and heat the coupling at the same time. This is maintenance 101!
Get a new worker, this guy doesn't know what he is doing.

 

[robyengIT]

to fit. What about for disassembly (for maintenance) ?

 

[mxm3904]

robyengIT --> Use jack bolts on the 3 threaded holes in the inner coupling

 

[Strong]

Are you going to "clean up" both sets of splines or leave them like it is?

Walt

 

[JJPellin]

Is that spline designed to be tight or a slip fit? Most of the splines that I work with are designed to slip on by hand. If that is the case with yours, you need to find the interference and remove it. It appears as if the part needs to engage the spline and the outer gear teeth at the same time. When you heated the part up, you may have been binding on the outer gear teeth and not the spline. Can you disassemble these parts so that you can do a trial fit on the outer gear teeth and the spline separately to be certain where you are hanging up?

Johnny Pellin

 

[Strong]

I would be surprised if one or both of the spline fits are intended for interference fit. It would not make sense to me to shrink-fit this coupling together. If the OEM cannot help or no one on this Board has specific information, then the choice is yours. If that is the case, then remove corrosion and burrs and see how well it fits together with appropriate lubricant.

Walt

 

[Tmoose]

Were the parts assembled at one time, and are now going back together?
If they are old friends being re-united, how difficult was disassembly?

X2 on the honorable Mr Strong's suggestion that parts have not been cleaned, massaged and otherwise detailed for re-assembly.
Perhaps it is just the pictures, but splines on the shaft look shallow or truncated near the shaft end.
And the splines in the bore look to jog to the right about halfway in.

 

[edison123]

Thank you all. A bit more about this setup.

This is an electromagnetic brake-clutch assembly fitted onto the ODE of a winch motor. The motor DE is directly connected to the 1st stage of the 3 stage gear assembly of the winch used in an off-shore oil rig.

The spline coupling was removed using hydraulic pullers and heating the spline coupling up to 150 deg C.

The spline hub wall that you see in the photos did have pitting corrosion marks but the mating parts did not have any mechanical damages or corrosion in the engagement areas.

Yesterday, I made the motor vertical and was able to press in the spline coupling in cold condition using a hydraulic jack.

Thanks again for your tips.

Muthu

http://www.edison.co.in