Building a Rail Bogie.Help with Rail wheel mounting and fit.

[igor19]

Hello.
Writing my first post here in hope that someone can help me with a solution.I am designing a rail bogie for a truck wich will allow the movement of the truck on the railway.The problem wich I am facing is the wheel mounting on the axle.The axle must support 3 elements:the bearings,the disc brake and the rail wheels.I had found a solution for the bearings and the disk brake mounting on the axle ,but can't find a solution for the wheel mounting.From what I had found ,in the rail way application the wheels a press fitted on the axle.There is no way this job can be done here at my workshop.The only solution will be the mounting on the axle with a parallel key,and the axial displacement on the axle of the wheel will be blocked by a shoulder of the axle on one side and by a nut wich will be tightened on the other side.The problem is that i am afraid by such solution because of some mechanical phenomenas as fatigue or fretting.Is there someone who can help me with a more secure solution (I tooked into consideration also mounting on a cone).
Thank You.

 

[chicopee]

Instead of press fitiing about shrink fitting the axle with dry ice.

 

[dvd]

Ringfeder or B-Loc type locking devices. Watch your tolerances.

Weld a flange onto the axles and bolt, or screw, the wheels. Makes it hard to mount the disk brake and bearings, but still possible.

Shrink fit, as stated above by Chicopee.

 

[IceStationZebra]

Be very careful with the stress concentrations. At the speed it spins it will not take long to see 10^8 stress reversals. This is why the normal process is press fit or shrink fit, the rail industry has had numerous problems with this over the years.

ISZ