COMPARATIVE STUDY OF THE USAGE OF SAE 8620 AND EN 36C IN AN AUTOMOTIVE DIFFERENTIAL

Paper URL’ An automotive differential gearbox is a critical component of the powertrain involved in the transmission of power and its appropriate distribution to the wheels. The gears of a differential are subjected to high stresses over multiple cycles making durability and reliability a significant concern to designers and manufacturers. Case hardened alloy steels such as SAE 8620 and EN 36C are commonly employed in such applications in the gear industry. The latter provides better performance in terms of core strength and wear properties but at a higher cost. This comparative study analyzes the differences in performance offered by SAE 8620 and EN 36C. Two open differential gearboxes are designed for the tipper truck 2516M from Ashok Leyland to simulate a scenario where gear manufacturers consider these materials. For identical pinion dimensions, EN 36C showcases a higher factor of safety by 17 percent, 52 percent, and 20 percent in tooth bending strength, surface wear resistance, and fatigue properties. SAE 8620, on the other hand, shines in the pricing department, offering satisfactory properties at a 16 percent lower cost when considering high volume production.

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