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Case Study / Mining Bearings

DAVON s.r.o. Czech Mining Reinforced Split Double Row Taper Roller Bearing (352240X2)

Reinforced 352240X2 split double row taper roller bearings built for Czech DAVON mine crushers—1.9x service life, 42% higher anti-impact load and 70% less downtime with no mounting changes.
1.9x
Service life
+42%
Anti-impact load
-70%
Shutdown hours
-22%
Procurement cost

Client Overview

DAVON s.r.o. is a Czech manufacturer of jaw crushers, cone crushers and complete mineral processing equipment, supplying mining and quarry clients across 29 countries with full ISO and safety certifications.

Original imported split cone bearings suffered roller chipping, inner-ring cracking and dust seizure, requiring replacement roughly every 4 months with 45-day import lead times.

Project Goals

Provide domestic high-impact-resistant bearing alternatives raising service life at least 1.8x, cutting procurement cost and 45-day lead time, surviving dusty rainy pits—all without altering existing crusher mounting dimensions.

Engineering Challenges

Extreme Continuous Impact

Ore collisions create pressure spikes causing roller-edge chipping and inner-ring fatigue cracking.

Dusty & Rainy Environment

Gravel dust and rainwater invade unshielded positions, triggering internal rust and seizure.

Fixed Mounting Limitation

Spindle housing dimensions cannot change—only internal structure optimization is allowed.

High Downtime Cost

Unplanned maintenance halts the full line, demanding at least 1.8x longer bearing life.

Technical Solution

Impact-Resistant Roller Design

Forged high-chromium steel with enlarged roller-end arcs and reinforced chamfers disperse impact stress.

3-Stage Composite Sealing

Labyrinth plus skeleton oil seal with high-temp waterproof extreme-pressure grease blocks infiltration.

Reinforced Copper Alloy Cage

Widened windows and limit flanges stop roller displacement under violent shock loads.

Full Pre-Production Verification

Dynamic impact simulation and full load bench testing with official reports before shipment.

“
We no longer rely on long-lead imported bearings—EGEN's reinforced split design runs our crushers reliably and passed every audit.
DV
Martin Novak
Production Director, DAVON s.r.o.

Achieved Results

Custom 352240X2 bearings ran 9 consecutive months on aggregate lines with no cracking or seizure; monthly shutdown hours fell 70%, and DAVON terminated all overseas orders to sign an annual bulk-supply framework contract with EGEN.

Ready to Upgrade Your Heavy Machinery Bearings?

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