anti friction bearings A/B Flashcards
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction?
Single row deep groove ball bearing?
Combination,two directions
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction.
Single row angular contact ball bearing?
Combination, one directional axial.
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Self aligning ball bearing
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Double row spherical roller bearing?
Combination, two direction.
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one directioWhat type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Single row tapered roller bearing?
Combination, one direction
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Double row tapered roller bearing?
Combination,reverse thrust
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Needle bearing?
Radial
What type of load the bearing normally supports (axial,radial, or combination) and wether it can support reverse thrust loads our thrust in one direction
Carb bearing?
Radial
To what accuracy should you measure when you check a bearing
Fit?
0.0001
What is the bore of a 6310 deep groove ball bearing?
50mm
Bearing with the code 7316 BE CB Y 2RS. Basic code number? What type of bearing? What the bore diameter?
Basic code 7316.
Type is single row angular contact ball bearing. Bore is 80mm
Can double row deep groove ball bearing takes more load or less load ?
Takes more load
Maximum capacity deep groove ball bearing takes radial only and no axial loss true or false
True
What are the 3 functions off the cage?
Align the rollers. 2 push the rollers through the unloaded zone.3 space the rollers so that they do not rub against each other
You should never heat a bearing past what temperature? a
120 degrees
Bearings with seals in then shouldn’t be heated more than?
80 degrees
What are some of many factors that affect a bearing ability to carry a load?
Area off contact,
Direction of load,
Loaded zone.
Also rolling friction,
Sliding friction,
Fluid friction.
What the parts of a anti friction bearings?
Outer ring,
Inner ring,
Cage,
Rolling elements, raceway. Seals.
Roller bearings each roller type shape supports a specific type odd load in a certain speed range these shapes include
Cylindrical, needle,tapered,spherical
K indicates a tapered bore if its taper ratio is?
1:12
K30 indicates what ratio?
1:30
What does discoloration indicate inside a bearing?
Overheating and tracks from electric arching
What are 4 heating methods for bearings?
Induction getting,
Heating cabinet,
Oil bath,
Heating ring.
If a bearing offs misaligned when it is just being started what should you do?
Tap on it’s high side using round stock and hammer if persist being misaligned do not drive it any further.
On roller bearings the internal clearance can be measured with a?_______Between the unloaded rolling element and the race way
Feeler gauge
What is preloaded?
It is the load the rolling elements are under before any external load is applied
Oil injection installation and removal processes are considered what? Non destructive or destructive?
Non-destructive
Never use puller on the outer ring of a self-aligning ball bearing it may _____ under tension
Explode
What are some destructive way to remove a bearings?
Grinder,torch,welding,pullers,a drive,
What should you do to the bearing assembly after you have cleaned it?
Inspect it for damage and try to determine the cause of failure
After you have removed any deposits or corrosion from the bearing seat, why should you not use emery cloth on the bare metal surface?
It reduces the diameter of the seat and destroys the fit.
When you cold mount a bearing on a shaft on which ring should you push on?
Push on the inner ring
Why should not use bras sleeve or a drift to drive a small bearing?
Brass will work harden and flake.
How can you remove a bearing without damage when it is not practical to hear it?
Shrink the shaft with dry ice or liquid nitrogen.
Rapid oxidation of lubricating is occurring due to high temperature this occurs above?
55°C (131 F)
If you cannot hold your hand on the bearing housing for one second, the housing surface I’d at least____°C and the bearing offs at least ___°C
Housing is 60C and bearing is 80C
After bearings are freshly installed or lubricated the temperature will rise and remain about___°C above normal for a few hours
15°C
Unsealed bearing temperature is to high when it exceeds___°C
125C
Sealed bearing temperature is to high when it exceeds___°C
80C
What is false brinelling or how is it caused?
The bearing it’s not turning and vibration is present
What I’d the biggest cause of bearing failure?
Contamination
If no vibration can be detected by hand on a bearing housing can you safely assume that there is no harmful vibration present yes or no?
No
What kind of sound should a good bearing make when herd through a stethoscope?
A soft purring sound.
Does new oil meet the minimum requirements for iso code for bearings?
No.
Does temp of 80°C directly harm the lubricant or the bearing?
It directly harms the lubricant.
What type of lubricant film provides the least friction in a plain bearing?
Full film
What does a high pitched scream indicate about a bearing?
The clearance is too small.
What do high amperage readings indicate about the condition of a bearing?
They are in very bad condition.
When should bearings be covered?
At anytime when you are not working on them.
What are the two common entry points for contamination on a bearing case?
The seals and the breather.
What is the most effective way to monitor the condition of a bearing while the machine is running?
By vibration monitoring.
An oil lift it’s a special application of _____ lubricating for start up?
Hydrostatic
Which system offers the most reserve capacity if the supply of lubricant fails?
A hydrodynamic
Which system or system’s can provide full film lubricating at start up?
Hydrostatic and hybrid system’s
Which system cannot provide full film lubrication under full load at start up
Hybrid lubrication
Should a bearing be packed with grease before or after it has been mounted?
After it has been mounted.
Why should grease outlet be open when re lubricating?
To expel old grease.
What should you normally check first after you discover that a bearing offs persistently running at higher than normal temperature?
Check that the oil level is not too high or to low.
1 is what bearing?
Double row self aligning
2 bearing is what?
Double row spherical roller
3 bearing is what
Tapered roller bearing
4 bearing is what
Double row deep groove ball, and only radial
5bearing is what
Ball thrust bearing
6 what bearing is it
Conrad bearing
7
Single angular contact
QJ what bearing is it
Four point contact bearing
