TAILIEUCHUNG - Planetary cycloid roller gear reducer

In this paper we present some results of the shaping tooth profile and the method of the relationships between gear parameters and of the analysis for properties of the planetary cycloid roller gear reducer. | Vietnam Journal of Mechanics, NCST of Vietnam Vol. 24, 2002, No 2 (115 - 122) PLANETARY CYCLOID ROLLER GEAR REDUCER NGUYEN THIEN PHUC Hanoi University of Technology ABSTRACT. In this paper we present some results of the shaping tooth profile and the method of the relationships between gear parameters and of the analysis for properties of the planetary cycloid roller gear reducer. 1. Introduction A tendency to replace sliding friction by rolling friction has contributed to the development of machinery. The ball spline and ball screw are the innovative linear motion system. However, the introduction of rolling contact to rotational motion by gear was never achieved. A planetary cycloid gear reducer, utilizing rolling contact for gear is presented following. A sectional drawing of the planetary cycloid roller gear reducer is shown in Fig. 1. 115 There are four basic components: 1-the input shaft with eccentric and bearing; 2-cycloid disks; 3-a ring gear housing with rollers; 4-an output shaft with drive rollers. The planetary cycloid pin gear reducer was first developed by Sanhikov [1] in the year 1948. Today, there are very few manufacturers producing the planetary cycloid pin gear reducer wit h some changes. CENTA Transmission Ltd (USA) and HAPDONG Machinery Co. (Korea) are among the mentioned above manufacturers. However, we know only their marketing informations from Internet. The following are our reseaches on the method of formation gear profile and its manufacturing, on the establishment of the relationships between gear parameters and on t he analysis for properties of the planetary cycloid roller gear reducer. y x Fig. 2 2. Operating principle The basic concept and principle of operation are as follows . The cycloid disk is mounted on t he eccentric bearing which rotates at the speed of the input shaft causing the cycloid disk to roll around the inside of the ring gear housing. As there is one less cycloid tooth on the disk than the number of

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