Bearings

Lesson 1 - Bearings and Shafts

Topics:

Bearing classification and selection; Shaft materials and stresses; Vibration; Critical speed; Fits and clearances

Learning Objectives:

– Name the two main categories of bearings and cite their advantages.
– Identify bearings by the kind of support they provide.
– Describe the three kinds of stresses acting on shafts.
– Explain natural frequency of vibration and critical speed.
– Name and describe three classes of fits.

Lesson 2 - Plain Journal Bearings I

Topics:

Features, types, and advantages; Lubrication; Lubricating grooves; Seals; Split bearings; Bearing design; selection

Learning Objectives:

– Explain the function of lubricating grooves.
– State two reasons for using seals on plain bearings.
– Name the principal types of plain journal bearings.
– Describe the structure of two kinds of precision inserts.
– Define crush and spread.

Lesson 3 - Plain Journal Bearings II

Topics:

Materials; Score resistance; Load capacity; Fatigue strength; Conformability; Embeddability; Corrosion and temperature resistance; Relining

Learning Objectives:

– Name and explain the characteristics that are most important in materials for bearings.
– State advantages and disadvantages of the standard types of bearing materials.
– Describe standard practices for inspecting bearings.
– Explain bearing repair procedures.

Lesson 4 - Antifriction Bearings I

Topics:

Operating principles; Bearing and cage materials; Lubrication; Seals and shields; Tolerances; Fits; Standard and precision bearings; Running accuracy

Learning Objectives:

– Identify the functions of the various parts of a typical rolling-element bearing.
– Explain the three elements of the AFBMA code.
– Define the categories of tolerances for ball bearings.
– Describe the factors that influence running accuracy of bearings.

Lesson 5 - Antifriction Bearings II

Topics:

Environment; Mounting; Radial and axial clearance; Fixed and floating bearings; Fits; Alignment; Mounting methods; Selection

Learning Objectives:

– Name the factors that must be considered in the design of antifriction bearings.
– Describe the process of checking adequate running clearances for bearings.
– Explain the reasons for using fixed and floating bearings together.
– Describe the common methods of mounting bearings.

Lesson 6 - Ball and Roller Bearings

Topics:

Ball and roller bearing design; Single-row radial, single- and double-row angular contact bearings; Two-piece, inner-ring bearings; Roller bearings

Learning Objectives:

– Name the three basic ball bearing designs and describe their characteristics.
– Explain the purposes served by the basic roller bearing shapes and their variations in typical applications.

Lesson 7 - Specialized Bearings

Topics:

Thrust, self-aligning, linear-motion, mounted, instrument, ungrounded ball, powdered-metal, nonmetallic, and hydrostatic bearings

Learning Objectives:

– Identify ten specialized bearings.
– Describe a specific function or application of each of these bearing types.

Lesson 8 - Bearing Seals

Topics:

Seal functions; Terminology and classifications; Labyrinth seals; Special seals; Selection and application; Seal materials; Mechanical seals

Learning Objectives:

– Identify the functions of bearing seals.
– Describe the construction and operation of labyrinth and oil seals.
– Explain the two classification systems for oil seals.
– Name typical applications for the different kinds of seals.

Lesson 9 - Lubrication

Topics:

Lubrication practices and equipment; Oil and grease lubrication; Packing; Manual, natural, and automatic lubrication devices and systems

Learning Objectives:

– State typical applications for oil lubrication of bearings.
– Detail the cleaning procedures for different oil lubrication systems.
– Discuss the three qualities that are the bases for selecting a grease lubricant.
– Give five easy rules for lubricating bearings.

Lesson 10 - Bearing Maintenance

Topics:

Maintenance, cleaning, and installation; Mounting and removing bearings; Loading patterns; Failure terminology

Learning Objectives:

– Identify a principal cause of early bearing failure.
– Describe installation procedures for antifriction and plain journal bearings.
– Name the different types of bearing failure and their causes.
– Tell how bearings should be cleaned and lubricated after inspection.