Some ball bearings are with cage and others are without cage. What is different between with cage and without cage?
Bearings with cages have deeper races and can therefore take more axial load. This is due to the assembly method. Because the races are deep, the manufacturer can't just press the balls in. The inner and outer races are placed eccentric to create a large gap on one side, and the balls are slipped in. You can't fit many balls in this way, so a cage is used to space the balls evenly. As a result of having fewer balls, the radial load is reduced.
Conversely, bearings without cages have shallower races. More balls can be assembled (pressed in) and therefore no cage needed. The shallower races mean lower axial load capacity. The greater amount of balls means higher radial load capacity.
I am not sure what you mean. So, I am going to go with the only thing that I can think of:
Do you mean, what is the difference between a linear bearing bushing (1) and a linear bearing in a pillow block (2)?
Ummm, yeah....so what Scott Stuart said.
Apparently my knowledge of bearings is extremely lacking. *grin*
I'll be damned I learned something about them, I have always viewed them in simpler terms as we use the term caged for all fully captured bearings.
Caged= sealed array bearing.
Non-caged= non sealed array of bearings.
Application determines the use of which version you need.
The most common is sealed, then there is added shielding, this applies to roller bearings, Dan's version above is linear bearings which have their own nomenclature.
Typically a non-caged or open array is used in a closed lubricated enviroment whereas a sealed one is used pretty much anywhere that it will be exposed to external elements.
Cages and seals are two different things. You can have a caged bearing with or without a seal, and a non-caged bearing with or without a seal.
Cages and seals I understood, this is what we consider a non-cage bearing in our enviroment. That is why I learned something new today. Hey never too late to learn I guess.
There are some bearings no need to lubricate, how it is possible? If there is a friction frequent lubrication is needed. Why I am asking this is because I have a exercise bike manufacture said no need to lubricate the rotating axis.
The bearing is probably pre-lubricated and sealed. Sealed bearings are packed with grease, and a rubber seal is put between the inner and outer races to hold the grease in. On a bike you'd have a seal on each side of the bearing, but you can also get bearings with a seal on one side only. There are also ceramic bearings that can run with no lubrication, but that's probably not used on an exercise bike.
When bike axis rotates heat will buildup. Will it not dry up the grease?
Then we can get into the big nastys like split housings.
We just got a set in and the shop is busily reading installation instructions.
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