Bearing Types and Characteristics Quiz AA

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Questions and Answers

What are the two major groups into which bearing can be divided?

Rolling bearings and sliding bearings

Plain bearings and rolling bearings (correct)

Ball bearings and roller bearings

Plain bearings and friction bearings

Which two categories further subdivide rolling bearings?

Bushing bearings and support bearings

Plain bearings and sliding bearings

Cylindrical bearings and spherical bearings

Ball bearings and roller bearings (correct)

What is a characteristic of a good bearing?

Made of a hard metal material

Able to withstand high temperatures

Strong enough to withstand imposed pressures (correct)

Designed to hold water

What is the primary function of a plain bearing?

To take radial loads, also known as ‘journal’ loads Signup and view all the answers

Why are some plain bearings flanged?

To handle thrust and radial load combinations Signup and view all the answers

What term is commonly used for anti-friction bearings?

Rolling element bearings Signup and view all the answers

Which advantage do rolling element bearings have over plain bearings?

They carry heavy loads Signup and view all the answers

What is a bushing typically used to support?

Smaller shafts of some engine accessories Signup and view all the answers

What type of bearing can handle high thrust loads combined with moderate radial loads?

Cylindrical roller bearing Signup and view all the answers

Which type of bearing is specifically designed to support heavy radial loads with a length greater than its diameter?

Needle roller bearing Signup and view all the answers

What type of loads are tapered roller bearings capable of supporting?

Heavy radial and thrust combination loads Signup and view all the answers

What defines an interference fit?

Where the inserted part is larger than the bore Signup and view all the answers

When is a retaining plate particularly useful?

If high-strength axial location is required Signup and view all the answers

What is a significant advantage of bearing retaining plates?

High axial retention capacity Signup and view all the answers

What is a disadvantage of bearing retaining plates?

They add weight and require more space Signup and view all the answers

What does impression staking involve?

Deformation of the bearing housing with a staking punch Signup and view all the answers

Which of the following is NOT a disadvantage of impression staking?

No added weight or space required Signup and view all the answers

What application are thrust bearings often used for?

Vertical support for heavy machinery Signup and view all the answers

Study Notes

Bearing Classification

Bearing types are broadly divided into plain bearings and rolling bearings.
Rolling bearings are further categorized into ball bearings and roller bearings.

Characteristics of Good Bearings

Must be strong enough to withstand imposed pressures.
Should minimize wear and friction during movement.
Designed with close tolerances for quiet, efficient operation.

Plain Bearings

Composed of a cylindrical component made from softer material than the shaft journal.
Typically designed to support radial, or journal, loads.
May feature flanged designs to accommodate thrust and radial load combinations.

Bushings

Small, removable plain bearings often referred to as bushes or bushings.
Used to support smaller shafts in engine accessories, control shafts, rods, or trunnions.

Anti-friction Bearings

Commonly known as rolling element bearings, including roller and ball bearings.

Advantages of Rolling Element Bearings

Exhibit low starting friction.
Capable of carrying heavy loads efficiently.
Suitable for applications involving reversing or oscillating movements.
Operate at cooler temperatures compared to plain bearings.
Generate significantly less friction than plain bearings.

Ball Bearings

Ideal for high-speed applications that require low loads.

Angular Contact Ball Bearings

Capable of handling high thrust loads alongside moderate radial loads.

Cylindrical Roller Bearings

Have the highest load capacity and manage high radial and shock loads more effectively than ball bearings.

Needle Roller Bearings

Characterized by rolling elements with a length greater than their diameter.
Support heavy radial loads efficiently.

Applications of Roller Bearings

Found in gearboxes, crankshaft main and con-rod bearings, and heavy accessories.
Suitable for scenarios requiring both heavy load capacity and a smaller diameter compared to ball bearings.

Tapered Roller Bearings

Known for their robustness and ability to support heavy radial and thrust combination loads.

Thrust Bearings

Commonly used in vertical mounts to support heavy machinery, such as radial-arm drill presses.
Employed in variable pitch propellers to allow for blade swiveling under centrifugal force.

Interference Fit

Defined as a fit where the part being inserted is larger than the bore itself.

Retaining Plates

Used when a high-strength axial location is necessary.
Advantages include high axial retention capacity and eliminating damage to housing during bearing replacement.
Easy to install and replace bearings without affecting internal clearance.

Disadvantages of Retaining Plates

Require housing modifications for bolt holes.
Can raise residual stress levels and add weight, demanding more space.

Impression Staking

Involves deforming the bearing housing with a staking punch.

Disadvantages of Impression Staking

Does not add weight or occupy additional space.
Facilitates easy installation of bearings.

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Description

Test your knowledge on the major groups of bearings and their specific types. This quiz covers plain bearings, rolling bearings, ball bearings, and roller bearings, along with characteristics that define a good bearing. Perfect for engineering students and enthusiasts alike.