Heavy Truck Transmission Gears

Overview

A heavy truck gearbox sees 1.2 million kilometres and fifteen years of torque reversals. In the auxiliary (range) section the load per tooth is higher than in the main box, which is why pitting and root cracking usually start there.

• Case depth 1.0–1.3 mm with a 30–40 HRC core balances pitting resistance against root toughness.
• Shot peening of the root fillet raises the bending fatigue limit by 15–20% when specified.
• Batch traceability links each gear to its heat number and furnace load for warranty claims.

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