What Is Bearing? All Types Of Bearings And Their Usage And Working

Summary

The video explains how bearings support rotating parts, reduce friction, and carry forces. It begins with examples such as a tractor performing stunts, a car drifting, a steam turbine, and a ship’s propeller shaft to show that bearings must withstand very different loads and speeds.

Core concepts

• A bearing is fitted between parts that move relative to one another—typically a rotating shaft and a stationary housing.
• Bearings reduce friction and support the load on the shaft.
• The video distinguishes two main force directions:
  • Radial force: Acts across the shaft, such as the vehicle’s weight pressing down on a wheel.
  • Axial force: Acts along the shaft or from the side, such as the force on a tire during drifting.
• Different bearing designs suit different combinations of load, speed, space, and shaft alignment.

Bearing types described

• Ball bearings

  • Use balls between an inner ring and an outer ring. A cage keeps the balls separated, grooves guide them, and grease can provide lubrication.
  • The video describes them as generally low-maintenance and suitable for radial loads.
  • Examples include motors in ceiling fans and washing machines.

• Angular-contact ball bearings

  • The rings are arranged at an angle so the bearing can carry both radial and axial loads.

• Self-aligning ball bearings

  • Their spherical outer ring lets them accommodate some shaft misalignment.
  • The video says the illustrated design can adjust to an angle of about 30 degrees and is intended to carry radial loads; side forces may dislodge the balls.

• Thrust ball bearings

  • Designed mainly for axial loads, with the rings and balls arranged to carry force along the shaft.

• Roller bearings

  • Use rollers rather than balls. The larger contact area increases load capacity, especially for radial loads.
  • The video notes that this larger contact area can also make them noisier.

• Cylindrical roller bearings

  • Presented as a roller-bearing design for carrying substantial radial loads.

• Spherical roller bearings

  • Designed for heavy loads and able to accommodate some shaft misalignment.
  • The video gives off-road vehicles and small ships’ propulsion systems as examples.

• Thrust roller bearings

  • Used to handle axial or angular loads, according to the explanation.

• Tapered roller bearings

  • Their tapered rings and rollers allow them to carry both radial and axial forces.
  • The video lists vehicle wheels, heavy construction equipment, gearboxes, train traction motors, and aircraft landing gear as applications.

• Needle roller bearings

  • Use long, narrow rollers and can be compact, requiring little radial space.
  • The video describes them as capable of carrying high loads and operating at high speeds.

• Plain bearings

  • Have no rolling elements; the shaft runs directly against the bearing surface.
  • They are described as simple, inexpensive, and suitable for heavy loads, but require regular oil lubrication.
  • Examples include train axles, turbines, agricultural machinery, bulldozers, cranes, ship propulsion systems, pumps, and table fans. The video also refers to these as “bush” or “bushing” bearings.

• Fluid bearings

  • Support the shaft on a film of oil between the shaft and bearing pads, rather than using rolling elements.
  • Hydrodynamic bearings rely on the rotating shaft to create the lubricating oil film.
  • Hydrostatic bearings use externally pressurized oil supplied by a separate pump or motor.
  • The video highlights their use in high-speed steam turbines, where reducing friction and controlling vibration are important.

• Magnetic bearings

  • Use magnetic forces to suspend and support a shaft without ordinary surface contact.
  • The video describes them as offering nearly friction-free operation once levitated, but says mechanical support is still needed while the shaft is starting or moving too slowly to levitate.

Speakers and sources featured

• Speaker: A single, unnamed narrator in voice-over; no other speakers are identified in the subtitles.
• Source/channel: LifeAda, identified in the video metadata.
• Other referenced material: The narrator points viewers to a separate Maglev video for a fuller explanation of magnetic levitation. The video also briefly promotes LifeAda’s 3D animation course.