Hard bearing is soft inside

Nov. 8, 2001
Standard spherical plain bearings use through-hardened 52100 steel for the spherical inner ring and the outer ring.

Standard spherical plain bearings use through-hardened 52100 steel for the spherical inner ring and the outer ring. The steel resists wear, but is somewhat brittle. This makes it easy to fracture the outer ring, a necessary manufacturing step that lets the inner ring slip into the split outer ring. But under harsh loads and sudden impacts, the brittle steel can fracture and break on impact.

To solve this problem, engineers at RBC Bearings in Fairfield, Conn., make their ImpactTuff spherical bearings out of carburized 8620 steel. They case harden the outer surface of the bearing and ring to RC 60, while keeping the inner core relatively ductile at RC 40. This lets the outer shell take the brunt of the impact, while the softer inner core absorbs and distributes the load to prevent cracks and fracturing. A patented notch machined in the outer ring permits controlled fracturing of the ring, which facilitates bearing assembly.

Sponsored Recommendations

NEW Low Profile, Ultra Compact Power Supplies

March 13, 2024
Learn more HERE about Altech's Power supplies!

Altech's Liquid Tight Strain Relifs Catalog

March 13, 2024
With experienced Product Engineers and Customer Service personnel, Altech provides solutions to your most pressing application challenges. All with one thought in mind - to ensure...

Industrial Straight-Through Cable Gland

March 13, 2024
Learn more about Altech's cable glands and all they have to offer for your needs!

All-In-One DC-UPS Power Solutions

March 13, 2024
Introducing the All-In-One DC-UPS, a versatile solution combining multiple functionalities in a single device. Serving as a power supply, battery charger, battery care module,...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!