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Case Study / Low Noise Cylindrical Bearings

H.C. Davis USA NU2218EMC3 Z2V2 Low Noise Cylindrical Roller Bearing Case

Century-old American feed-machinery maker H.C. Davis replaced noisy Z1V1 units with EGEN NU2218EMC3 P6-Z2V2 silent cylindrical roller bearings—mirror-superfinished raceways, 100% vibration screening and C3 clearance cutting running noise 5dB to ≤62dB and abrasive-wear failures 85%.
-5dB
Machine noise drop
≤62dB
Heavy-load noise
-85%
Abrasive wear failure
100%
ZV2 inspection qualified

Client Overview

Founded in 1894, H.C. Davis Sons Manufacturing Co. is a century-old American family enterprise specializing in heavy-duty feed mixing mills, roller grinders and industrial mixing reducers for animal-feed plants across North America.

Conventional Z1V1 cylindrical roller bearings produced humming and high-pitched squeals under long-hour heavy alternating impact loads, while metal debris and massive iron filings inside gearboxes triggered abrasive wear—failing factory environmental noise standards.

Project Goals

Supply Z2V2 silent cylindrical roller bearings—the mid-tier grade between standard Z1V1 and premium Z3V3—to cut equipment noise and after-sales maintenance, with tight dimensional tolerance matching to H.C. Davis's existing shafts and housings.

Engineering Challenges

Heavy Impact Contact Stress

Alternating impact loads on stirring gear create high roller-raceway contact stress, easily forming fixed vibration noise points.

Iron-Filing Intrusion

Massive iron filings from gear wear penetrate ordinary seals and trigger abrasive wear of raceways.

High-Temp Grease Dilution

Sustained high operating heat accelerates grease dilution and leakage, shortening silent service life.

Full-Length Superfinishing Consistency

Cylindrical bearings have large integral raceway surfaces, so uniform full-length mirror finishing is hard to stabilize in mass production.

Technical Solution

Mirror Superfinishing & Size Grouping

Full mirror finishing on raceways and rollers with precise size grouping eliminates harmonic resonance whistling and low-frequency humming.

100% Full Vibration Inspection

Every ZV2 bearing is screened to remove over-limit units, ensuring consistent silent performance for mass-assembled heavy mixers.

Optimized Roller Contact & C3 Clearance

Redesigned roller contact spreads heavy impact stress; C3 clearance adapts to shock load and long-term high temperature.

Field-Tuned Grease & On-Site Service

High-temperature anti-wear grease tuned from field data, with full sampling inspection and periodic on-site silent-performance checks.

EGEN's Z2V2 silent bearings finally stopped the squeal on our heavy mixers—quieter operation and far less after-sales wear.
HD
Robert Callahan
Engineering Manager, H.C. Davis Sons Mfg. Co. - USA

Achieved Results

After adopting EGEN NU2218EMC3 P6-Z2V2 bearings, running noise of H.C. Davis's heavy mixing reducers dropped 5dB with no harsh squeals under heavy impact; the abrasive-wear failure rate fell 85%, drastically cutting after-sales maintenance frequency for large industrial stirring machines.

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