Crossed helical gears with wheels from sintered steel with pyrohydrolysis

Abstract

Crossed helical gears are used in cars and in many household appliances. The trend towards increased comfort in motor vehicles has led to the utilization of more than a hundred servo-drives in luxury class automobiles. Important advantages of the crossed helical gears are their easy and inexpensive design, good noise performance and high ratio that can be realized in one step. Sintered steel shows as very favorable material for wheels in crossed helical gears. High demands are set on gears made from sintered steel regarding wear, fretting, tooth fracture and pitting load capacity. This report shows results of iron-based sintered material Fe1.5Cr0.2Mo with pyrohydrolysis as additional treatment, in case of crossed helical gears concerning wear resistance and other damage types under different speed and load.