Nissei Corporation


Introduction of equipment and proprietary technologies

HRH gear

What is the HRH gear

High Ratio Hypoid Gear

Difference between hypoid and High Ratio Hypoid Gear

 HypoidHigh Ratio Hypoid Gear
Number of teeth5 or more1 or more
Tooth profileInvoluteSpecial surface

Background of development

Are there any mechanisms that can achieve high reduction more easily?  A High Ratio Hypoid Gear can achieve up to 1/360 reduction by engagement of one pair  Comparative diagram between a bevel gear and a HRH gear

Performance of High Ratio Hypoid Gear – (1) Transmission efficiency

Improved by 20% compared with the worm mechanism  Comparative table of the transmission efficiency of the HRH gear and worm gear

Performance of High Ratio Hypoid Gear – (2) Strength

Both gear and pinion can be quenched  The strength is twice or more higher than that of the worm mechanism  Comparative diagram of the materials of the HRH gear and worm gear

Performance of High Ratio Hypoid Gear – (3) Compact design

The offset amount can be reduced, which enables about 30% space saving compared with the worm mechanism  Comparative diagram of the offset positions of the HRH gear and worm gear

Performance of High Ratio Hypoid Gear – (4) Cost

A single-step mechanism can achieve up to 360:1 reduction, contributing to competitive prices Comparative diagram of traditional multiple-step mechanism and single-step mechanism of High Ratio Hypoid Gear

Performance of High Ratio Hypoid Gear – (5) Example of use of an HRH gear (reducer for an automatic door)

About 60% reduction of the volume ratio/weight ratio  Comparative diagram of the volume ratios/weight ratios of competitors' products (worm type) and our products