Roller
New crowning (To make inclination of several microns from rolling surface to chamfer of rollers to reduce edge stresses that occur at the border of the chamfer and rolling surface.) roller for high load
The roundness of crowning is enhanced to stabilize movement of rollers when rotating. It enables the developed product to lower noise level compared to conventional product, meeting the needs of EV that requires more quietness. Optimizing crowning shape also suppresses increased contact stress and edge stress even inclination, and improves surface initiated damage life under severe lubricating conditions.
Cage
The M shape welded cage is composed with carburized steel (Case hardening steel with carburization heat treatment) with higher strength than the conventional special low carbon steel so that it improves fatigue strength to enhance high speed rotation performance.
Shaft
JIS SUJ2 steel
Application
Planetary gears for AT and CVT, gearboxes for EVs, etc.
