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NASEEL IBNU AZEEZ.M.P
Assistant Professor
Department of Mechanical Engineering
Email:naseel@live.com
Bearing is a machine component which supports another machine element (known as
journal).
It permits relative motion between the contact surfaces of the members, while
carrying the load
• Based on the Direction of Load
1. Radial Bearing
Load acting perpendicular to the direction of motion of
moving element
2. Thrust Bearing
Load acts along the axis of rotation
• Based on Nature of Contact
1. Sliding Contact Bearing
Sliding takes place between the fixed and moving element of
bearing and its also known as plain bearing
2. Rolling Contact Bearings
Balls or rollers introduced between moving and fixed elements
and it is also known as anti-friction bearings
Bearings Classification and Working
Journal Bearing
Hydrodynamic Bearing Hydrostatic Bearing
Bearings Classification and Working
9
Journal (Sleeve) Bearings
Load is transferred through a lubricant in sliding contact
10
Journal (Sleeve) Bearings
Thick-film lubrication (hydrodynamic), pressure distribution, and
film thickness.
hmin = minimum film thickness, c = radial clearance,
e = eccentricity
Bearings Classification and Working
Rolling Contact Bearings
Rolling contact bearings are also known as antifriction bearings.
The load, speed, and operating viscosity of the lubricant affect the friction
characteristics of a rolling bearing.
These bearings provide coefficients of friction between 0.001 and 0.002.
The designer must deal with such matters as fatigue, friction, heat, lubrication,
kinematics problems, material properties, machining tolerances, assembly, use and
cost
Rolling Contact Bearings
Rolling contact bearings are also known as antifriction bearings.
The load, speed, and operating viscosity of the lubricant affect
the friction characteristics of a rolling bearing.
These bearings provide coefficients of friction between 0.001 and
0.002.
The designer must deal with such matters as fatigue, friction,
heat, lubrication, kinematics problems, material properties,
machining tolerances, assembly, use and cost
Constructionofbearing
The rolling contact bearings are composed of four
elements.
i. Outer race
ii. Inner race
iii. Rolling element
iv. Cage of retaining ring
Roller contact bearing
With its parts
i. Outer ring (or) Outer race
ii. Inner ring (or) inner race
iii. Rolling elements
iv. Cage or retaining ring
Construction Diagram :
Classification of rolling bearings
i. Ball Bearing
• Deep groove (Conrad) bearing
• Filling notch ball bearing
• Angular contact bearings (AC)
ii. Roller Bearing
• Cylindrical bearings
• Needle bearings
• Tapered bearings
• Spherical bearings
Classified into two types
Ball Bearings
Deep groove bearing
 Single row of deep groove ball bearing can combinational of radial and
thrust load.
Load capacity is limited by the number of balls
Primarily designed to support radial loads, the thrust capacity is about
70% of radial load capacity
Filling notch ball bearings
Bearings have the same basic radial construction as
Conrad type. However, a filling notch (loading groove)
permits more balls to be used.
Radial load capacity is 20 – 40% higher than Conrad
type.
Thrust load capacity drops to 20% (2 directions) of
radial load capacity.
Angular contact Ball bearings (AC)
The centerline of contact between the balls and the raceway is at an
angle to the plane perpendicular to the axis of rotation.
Used for high radial and thrust load applications
RADIAL AND ANGULAR BEARING
Standardization of bearings
Roller Bearings
Roller bearings have higher load capacity than ball
bearings, load is transmitted through line contact instead of point
contact.
Helical rollers are made by winding rectangular material
into roller. Due to inherent flexibility they are capable of taking
considerable misalignment.
A roller with length much larger than diameter is known
as needle roller and are used where radial space is limited. Cage
nay be absent in needle roller bearings.
ROLLER BEARINGS

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Bearings Classification and Working

  • 1. NASEEL IBNU AZEEZ.M.P Assistant Professor Department of Mechanical Engineering Email:naseel@live.com
  • 2. Bearing is a machine component which supports another machine element (known as journal). It permits relative motion between the contact surfaces of the members, while carrying the load
  • 3. • Based on the Direction of Load 1. Radial Bearing Load acting perpendicular to the direction of motion of moving element 2. Thrust Bearing Load acts along the axis of rotation
  • 4. • Based on Nature of Contact 1. Sliding Contact Bearing Sliding takes place between the fixed and moving element of bearing and its also known as plain bearing
  • 5. 2. Rolling Contact Bearings Balls or rollers introduced between moving and fixed elements and it is also known as anti-friction bearings
  • 9. 9 Journal (Sleeve) Bearings Load is transferred through a lubricant in sliding contact
  • 10. 10 Journal (Sleeve) Bearings Thick-film lubrication (hydrodynamic), pressure distribution, and film thickness. hmin = minimum film thickness, c = radial clearance, e = eccentricity
  • 12. Rolling Contact Bearings Rolling contact bearings are also known as antifriction bearings. The load, speed, and operating viscosity of the lubricant affect the friction characteristics of a rolling bearing. These bearings provide coefficients of friction between 0.001 and 0.002. The designer must deal with such matters as fatigue, friction, heat, lubrication, kinematics problems, material properties, machining tolerances, assembly, use and cost
  • 13. Rolling Contact Bearings Rolling contact bearings are also known as antifriction bearings. The load, speed, and operating viscosity of the lubricant affect the friction characteristics of a rolling bearing. These bearings provide coefficients of friction between 0.001 and 0.002. The designer must deal with such matters as fatigue, friction, heat, lubrication, kinematics problems, material properties, machining tolerances, assembly, use and cost
  • 14. Constructionofbearing The rolling contact bearings are composed of four elements. i. Outer race ii. Inner race iii. Rolling element iv. Cage of retaining ring
  • 15. Roller contact bearing With its parts i. Outer ring (or) Outer race ii. Inner ring (or) inner race iii. Rolling elements iv. Cage or retaining ring Construction Diagram :
  • 16. Classification of rolling bearings i. Ball Bearing • Deep groove (Conrad) bearing • Filling notch ball bearing • Angular contact bearings (AC) ii. Roller Bearing • Cylindrical bearings • Needle bearings • Tapered bearings • Spherical bearings Classified into two types
  • 17. Ball Bearings Deep groove bearing  Single row of deep groove ball bearing can combinational of radial and thrust load. Load capacity is limited by the number of balls Primarily designed to support radial loads, the thrust capacity is about 70% of radial load capacity
  • 18. Filling notch ball bearings Bearings have the same basic radial construction as Conrad type. However, a filling notch (loading groove) permits more balls to be used. Radial load capacity is 20 – 40% higher than Conrad type. Thrust load capacity drops to 20% (2 directions) of radial load capacity.
  • 19. Angular contact Ball bearings (AC) The centerline of contact between the balls and the raceway is at an angle to the plane perpendicular to the axis of rotation. Used for high radial and thrust load applications
  • 22. Roller Bearings Roller bearings have higher load capacity than ball bearings, load is transmitted through line contact instead of point contact. Helical rollers are made by winding rectangular material into roller. Due to inherent flexibility they are capable of taking considerable misalignment. A roller with length much larger than diameter is known as needle roller and are used where radial space is limited. Cage nay be absent in needle roller bearings.