FE-BASED SINTERED ALLOY SYNCHRONIZER RING

摘要

PROBLEM TO BE SOLVED: To improve a friction characteristic and seizure resistance by applying a thermosetting resin (an expoxy resin) blended with walnut shell powder as a friction material to an Fe group sintered alloy material treated with steam, hardening/joining the thermosetting resin by performing heating/pressurizing processing, and forming a layer composed of the friction material on a surface. SOLUTION: A synchronizer ring 4 is manufactured from an Fe-based alloy sintered body by sintering green compact at a about 1000 to 1200 deg.C after being formed as the green compact by pressurizing alloy element powder in a metal mold by blending/mixing the alloy element powder such as graphite powder or Cu powder when necessary by prescribed blending quantity with iron powder or low alloy steel powder. A layer 45 composed of a friction material is formed on a vertical groove 44 for cutting lubricating oil of such a product and a tapering inner peripheral surface 40 having a ring-shaped strip groove 42 orthogonal to this vertical groove. This layer 45 is formed of the friction material by blending walnut shell powder with a thermosetting resin such as an epoxy resin to thereby increase a coefficient of dynamic friction of an inner peripheral surface to improve a friction characteristic and seizure resistance.