Bearings - Anti Friction

Question 0

Spherical roller bearing?

Answer 0

• ISO #2
• barrel-shaped rollers provide a wide load carrying contact area
• combined thrust in both directions and radial load capacity
• the spherical track on the outer race allows for internal self alignment
• high radial load, minimal thrust

Question 1

3 functions of the cage?

Answer 1

• prevents the rolling element from rubbing against each other
• push rolling elements through the unloading zone
• no pushing needed through loaded zone because of the traction provided by the load
• guide the rolling elements with minimum amount of friction

Question 2

CARB

Answer 2

• compact aligning roller bearing
• the shape makes it radially compact like a needle bearing, but with some of the misalignment capabilities of the spherical roller
• not good for thrust

Question 3

Diametral Clearances

Answer 3

• Initial or Bench
• Residual or Installed - 1/2 bench clearance during installing
• Running

Question 4

Single Row Deep Groove Ball Bearing

Answer 4

-ISO #6
-most common ball bearing
-Conrad bearing
-mainly to support radial loads
-can support combination loads and moderate axial loads in both directions
-

Question 5

Single Row Angular Contact Ball Bearing

Answer 5

• ISO #7
• substantial thrust load in one direction
• higher load rating than deep groove ball bearings
• can be mounted against each other or together with a spacer between them (arrangements)
• must operate with an axial load component

Question 6

Tapered Roller Bearings

Answer 6

• ISO #3
• Inner ring also called cone and outer ring called cup
• best for combination load
• should be preloaded
• has a pressed steel cage which is the most common
• also has a Pin Cage which can support more load because point of contact is closer together.

Question 7

Loaded Zone

Answer 7

• the area of the bearing that has force on it. Radial will have less than axial because how the pressure is applied
• loaded zone depends on the amount of internal clearance and preload as well

Question 8

Needle Bearings

Answer 8

• has no cage or inner ring, needles are retained by grease
• 2 1/2 to 10 times as long as their diameter
• when installing ensure you use the proper size mandrel so the wall of the cup doesn’t get crushed

Question 9

Brinelling

Answer 9

• excessive pressure on a ball bearing by hammer or force

- impact denting

Question 10

Cylindrical Roller Bearings

Answer 10

-Separable in both direction
-only support radial loads
-

Question 11

Cylindrical roller thrust

Answer 11

• very heavy thrust load

- rollers are laying differently

Question 12

Single row angular contact ball bearing arrangements

Answer 12

• Face to face
• Tandum
• Back to back used as back up bearings rigid

Question 13

Face to face Arrangement

Answer 13

• can handle reversing axial loads

- suitable for use in housings with less accuracy or larger shaft deflection due to low bending stiffness of the shaft

Question 14

Tandum Arrangement

Answer 14

-can handle more radial load than face to face and back to back, but can only handle axial load in one direction towards the high shoulder on the outer ring

Question 15

Back to Back arrangement

Answer 15

• can handle reversing axial loads
• used as back up bearings
• are mounted further apart so they can hold the shaft more rigidly in angular alignments
• more rigid than face to face

Question 16

Four Point Angular Contact Ball Bearings

Answer 16

• can be used for only combination or axial loads so that the load does not run on the split
• is a separable bearing
• can handle reversing thrust reversing thrust loads in either direction because of the shape of the raceways

Question 17

Maximum Capacity Deep Groove Ball Bearing

Answer 17

• has more balls than deep groove because of the loading slots machined into the inner and outer raceways.
• higher radial load

Question 18

Internally self aligning ball bearings

Answer 18

• inner part of the outer ring is spherical
• used when alignment is impractical or impossible to maintai
• small thrust loads in either direction
• available with a tapered bore for mounting on a tapered adapter sleeve or tapered withdrawal sleeve for mounting against a shoulder.

Question 19

Externally self aligning ball bearing

Answer 19

• has a spherically ground outer ring that mounts in a special housing.
• intended to accommodate angular misalignment in mounting

Question 20

externally compared to internally self alignin

Answer 20

-internal can support only relatively small axial loads, more suitable for where shafts wobble back and forth with each rotation

Question 21

False brinelling

Answer 21

• same as brinelling but caused by vibration

- happens over time when brinelling happens right away

Question 22

Two methods of retaining rollers in a needle bearing?

Answer 22

Grease and drawn steel cup

Question 23

ISO

Answer 23

• 1 number is bearing type
• 2,3 is the dimension series
• last 2 bore diameter (the number x5) or exceptions 00-10, 01-12, 02-15, 03-17 or sizes over 500mm

Question 24

When cleaning a shaft with air?

Answer 24

Be sure to hold both races to prevent spinning

Question 25

Separable bearings

Answer 25

Oil ring can separate

Question 26

Removal of tapered bearing

Answer 26

• No puller because of the axial component to the hydraulic force due to the taper
• leave retaining nut close to the bearing to prevent it from shooting off

Question 27

Internal clearance

Answer 27

-Total amount of clearance between rolling elements and the raceway when one bearing ring is pushed as far a way from the other ring as possible

Question 28

Radial clearances

Answer 28

-5 different levels C1-5

Question 29

Non-rubbing seal (shields)

Answer 29

• Attached to the outer ring but leaves a gap at the inner ring
• suffix ‘Z’
• can only exclude coarse contaminants

Question 30

Rubbing seals

Answer 30

• attached to the outer ring but with a rubber lip seal that contacts the shaft
• lower speeds but better protection
• suffix ‘RS’