HSOAR Group 

en.china-hsoar.com

World No. 4 Precision reduction technology, which breaks the gear drive monopoly, and bring vector double cycloidal reduction rolling ball motion to the world Robotics, Space research, medical service, old people care robot, automation etc fields.
It reveals the absolutely true cycloid eccentric motion during the speed reduction, with all steel balls as drive media, which distribute and roll evenly during the eccentric motion on cycloid disk to produce differential reduction,  also this high precision reducer is made of bearing steel with a design life about 100,000 hours. The rolling features zero backlash, no dead end, full contact. Include total 4 parts very simple on structure, and process chain, easy for putting into mass production. The two cycloids are in different frequencies thus bring no vibration. 
The operation principle is more like rolling ball bearing.