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Types of bearings used in jet engines.

 Types of bearings used in jet engines.

Type of Bearing

Advantages

Disadvantages

TBO

Scrap Life

Ball Bearings

- Handle both radial and axial loads efficiently. - Low friction & high-speed capability.

- Limited load-carrying capacity. - Prone to skidding under light loads.

5,000 - 15,000 hours

Based on wear limits, typically 20,000+ hours.

Roller Bearings

- Higher radial load capacity than ball bearings. - Reduced skidding.

- Cannot handle high axial loads. - Increased friction compared to ball bearings.

5,000 - 15,000 hours

Typically 20,000+ hours or until excessive wear.

Tapered Roller Bearings

- Can handle both axial and radial loads. - High load-carrying capability.

- Higher friction losses. - Requires precise lubrication.

10,000 - 20,000 hours

Scrap life based on wear and damage, ~25,000+ hours.

Needle Bearings

- Compact and lightweight. - Suitable for limited radial space applications.

- Lower load capacity compared to roller bearings. - High sensitivity to contamination.

7,000 - 15,000 hours

Based on wear condition, ~20,000+ hours.

Hydrodynamic Bearings

- No direct metal-to-metal contact, reducing wear. - Long service life with proper lubrication.

- Requires continuous oil supply. - Performance is affected by oil viscosity changes.

15,000 - 30,000 hours

Can exceed 30,000 hours if well-maintained.

Magnetic Bearings

- Virtually no wear due to no physical contact. - Low maintenance and high-speed operation.

- Complex and expensive. - Requires electronic control.

20,000+ hours

Typically 40,000+ hours; depends on system reliability.

 

Type

Load Capacity

Speed Capability

Maintenance Needs

Typical Applications

TBO (hours)

Scrap Life (hours)

Ball Bearings

Medium

High

Moderate

Main shaft, gearbox

5,000 - 15,000

~20,000+

Roller Bearings

High (Radial)

Medium

Moderate

Main shaft, compressors

5,000 - 15,000

~20,000+

Tapered Roller Bearings

High (Axial & Radial)

Medium

High

Turbofan main shafts

10,000 - 20,000

~25,000+

Needle Bearings

Low

High

High

Gearboxes

7,000 - 15,000

~20,000+

Hydrodynamic Bearings

Very High

Very High

High

Large engines, high-speed rotors

15,000 - 30,000

30,000+

Magnetic Bearings

Unlimited (No Contact)

Extremely High

Low

Advanced & high-speed engines

20,000+

40,000+

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