Support rotating shafts; rolling-element and journal types trade friction, load and life.
Rolling bearings (ball, roller) have low friction; journal bearings use fluid film or bushings. Life L₁₀=(C/P)^p million revolutions (p=3 for balls). Selection depends on load, speed, alignment and lubrication.
A deep-groove ball bearing supports radial loads in electric motors.
Bearings support loads and allow smooth rotation, and their selection controls life, friction and maintenance of a machine.
Support rotating shafts; rolling-element and journal types trade friction, load and life.
Bearings support loads and allow smooth rotation, and their selection controls life, friction and maintenance of a machine.
Rolling bearings use balls or rollers with low friction, while journal bearings slide on a lubricating film and suit heavy loads at lower speeds.
Load, speed, lubrication and contamination. Rating life is often quoted as the number of revolutions reached by ninety percent of bearings.
Typical applications include selecting a ball bearing for a motor shaft at a given speed, choosing a journal bearing for a large slow-moving shaft and estimating the life of a wheel bearing under road load.
Study "Belt and chain drives" first (topic 88 of 106 in Engineering Mechanics). It covers the groundwork this topic builds on.
Radial vs thrust loads. Preload eliminates play. Sealing and lubrication determine life.
A deep-groove ball bearing supports radial loads in electric motors.
The next topic is "Springs", which builds directly on this one.
It is classed as Advanced in Engineering Mechanics (topic 89 of 106). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Engineering Mechanics.
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