Quote:
Originally Posted by Matt G.
CADplans-
Your load path is backwards. Let's say you are driving along and hit a bump that temporarily stops your tractor's forward movement. Assuming you didn't high-center the tractor or hit something with the frame to stop it, the wheels have stopped moving, and the tractor's inertia is trying to carry it in the direction it was originally traveling. Consequently, the deceleration of the tractor's mass is the force applied to the wheel bearings.
Now if if you were instead plowing snow, for instance, and stopped the tractor through the frame and not the wheels, the wheels would want to continue moving and then what you are saying would be correct, except that for the loads to be the same or worse than what I explained in the previous paragraph, each rear wheel would have to weigh at least half of what the tractor/operator does. And if that was the case, you'd likely change the failure mode to the axle instead of the bearing. The other thing is that the additional weight on the frame is ALWAYS increasing the load on the axle bearings.
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I am saying nothing about forward motion, I am talking about hitting a bump while traveling. Having a heavy wheel assembly will have a greater influence on the bearing than having a light wheel assembly.
Hold a 4# hammer head in your hand. Go to a 150# anvil and hit the back of your hand on the anvil, let me know when the pain stops.
The hammer is way lighter than the anvil.
Go to any performance car website. Tell them you want to make the wheel assembly heavier to improve performance, see what happens.
Yea, I know a car is different.
Yea, using static calculations adding wheel weights sound good.
There are factors you are not considering.