Chapter 5- Bearings Flashcards
(35 cards)
Define radial loads
Load applied perpendicular to shaft
Shaft going through a hole in a roller bearing
Thrust(axial loads)
Loads applied parallel to acid of shaft
Loads applied to face of bearing
Combination loads
Both radial and axial load
Difference between a plain bearing and a rolling element beating
Plain bearing is any bearing using a sliding action
Roller element used roller friction
Specific differences between class 1 class 2 and class 3 plain bearings
Class 1-lubricated from outside source
Class 2-internal lubrication
Class 3-graphite or Teflon that require no lubrication
What type of bearing is also called an anti friction bearing
Rolling element bearing
List three basic types of rolling element bearings
1 Ball bearings
- Roller bearings
- Needle bearings
Difference between hydrostatic and hydrodynamic bearing lubrication
Hydrostatic-uses an outside pressure source to keep continuous stream
Hydrodynamic-uses coating action of rotation of shaft
What is a “sealed” bearing and why is this desirable
Sealed bearings
- keep contaminants out
- keep lubrication In
What is the advantage of a single row angular contact ball bearing
Can accommodate 300% more axial load
An ivy take axial loads in one direction
Can a single row angular contact ball bearing be installed in either direction
NO
What are the two types of thrust ball bearings and what is the difference
- Flat race type with two flat washers
2. grooved race construction . May be single or double acting . Have twice te load carrying ability then flat race
What are the two types of bearing seals and what is the difference
- contacting seals-touch the surface and usually use a softer material in shaft side
- non-contacting seals- leave a small clearance. Labyrinth seal is a type of this.
When is it acceptable to spin a bearing with compressed air to clean it
Never. But if you do…hold te bearing and don’t let it spin
What is another name for a press fit bearing mounting
Interference fit
Like the videos we watche d
Can cylindrical roller bearings carry combination(radial and axial) loads?
No they can only carry radial loads
When are tapered roller bearings used?
Designed for slower speeds, can handle high radial and thrust loads but can not handle any real misalignment
What is advantage of spherical roller bearing
May be single or double row
Designed to handle heavy radial and axial. Can function with misalignment
What is the difference between a cylindrical roller bearing and a needle bearing assembly
Needle row bearings are a type of cylindrical but are 6-10 times longer and typical smaller than 1/4in.
List important things to consider wen installing a bearing into an internal opening
- cleanliness
- original container
- associated parts
- never spin with air
- never force a seal or shield
- bearing alignment
- press only on ring or raceway
What are the thermal methods used for mounting bearings
- oil bath
- Heating plates
- induction heating
Why should you never use a torch to heat bearings to install them
Open flames usually far exceed max temp and could change the temper of the metal of te bearing
Why should you never use a torch to heat a bearing on a hardened shaft or axle when trying to remove it
J
Explain what a pillow block bearing is and list the two types
Pillow block act as parallel support for a shaft and can be either
One piece
Split
