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QUOTE(davidke20 @ Jul 24 2013, 10:33 PM)
This 1 if rosaked... ... in case if you don't realize the left bearing is busted, the right is new

Become like this

The flat bedded rollers will deform, and the whole cone will detached from the housing, so as your wheel (my wheel in this case)

It may give some sign/warning prior fully malfunction, but it usually a very short notice. Some can last few months, some 1 day. Mine was extreme condition, so the signal only managed to emit few seconds before the wheel fly off

Added on
properly designed car
Picture below, is already a rosaked bearing. Pay attention to the ball seated at 9 o'clock. It has free play, meaning to say the steel ball already shrink due to wear & tear friction. As and when you wheel spin, the surface contact reaches this ball, the surface will knock on the contact and will emit humming sound, which will channel to your cabin. It can stay rosak for a very long time, atleast 5~6 years without the ball fly off.

The bearing structure is so strong, before it deform, some other thing already gave up


Get the picture?
Just to give my thoughts on the bearing type.
Ball bearings (BB) vs Tapered Roller bearings (TRB).
Actually, both has it cons and pros depending on how they are used and applied.
Ball bearings has a much lower surface contact area than tapered roller bearings which hence makes them less capable of absorbing the stress and load from the rotating shafts.
*Imagine a sphere and a cylinder on a flat surface, and you will notice the contact surface area difference.As you can see in david's pic, TRB has a much wider and more surface contact area which makes them ideal for better stress and load transfer.
Ayam work for a German pump manufacturer company and our pumps uses such TRB as compared to our competitors which sticks to the BB which is of much lower manufacture price.
In fact, it is our HQ that insists they want to stick to this bearing design so that we have an upper hand to our competitors.
See below.

Like I said, both BB and TRB has its own pros and cons.
TRB is good for more efficient transfer / absorb of stress and load due to bigger surface contact area.
However, like david explained, they are not good for absorbing shocks.
This is true when it is used for our cars and in Malaysia.
With all the uneven roads, potholes, bumps, extreme speed breakers & etc., they are just too much for such TRB bearing type to work longer or comparable to BB.
Also not to mention the driver's driving style. Sudden pecut and hard braking. All these are not good stuffs for TRB.
In my company's pumps, they do not subject to shocks as much as our car wheels.
No uneven roads, potholes & etc.
We do not operate the pumps suddenly from slow shoot up to high speed and then from high speed, slow down again.
It's only the stress and load from a rotating shaft that the TRB needs to handle, hence, the service life of TRB will be much higher than BB in my case.
Hence, both TRB and BB has its own pros and cons depending on the application.
TRB may be good for my case but bad if used on cars.
Above are ayam theories based on my technical expertise that I have now on bearings.
Kindly correct / advise me if I'm wrong.
This post has been edited by ruby1288: Jul 25 2013, 08:30 AM