New Hardening Process for Transmission Synchronizer Hubs

Abstract

Synchronizer hubs are powder metal parts often used in vehicles for manual and dual clutch transmissions. The synchronizer hub, which synchronizes mechanical connections to shift gears, needs high strength and durability. Although these properties can be improved by carburization or partial hardening, such processes can lead to increased costs. We used a roller hearth high temperature furnace that can be cooled rapidly, and optimized the material composition and sintering conditions. Thus, we have succeeded in the development of synchronizer hubs without requiring the second hardening process.