The Characteristic Analysis of the Worm Gear Set Generated by Disc-Type Cutter

• Main Authors: Jian-Yu Huang, 黃健育
• Other Authors: Ray-Quen Hsu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/90157857443010487890

碩士 === 國立交通大學 === 機械工程系所 === 95 === Worm gear sets can conquer the tooth undercutting problem, which occurs due to the small number of teeth of conventional gear sets with some special modules. Therefore, worm gear sets can provide high gear ratio that spur and helical gear sets could not offer. Besides, the worm gear set has a larger contact ratio which enables its loading capability. In order to increase the contact ratio of a worm gear set, the worm gear set can be generated with a non-ninety-degree crossing angle. This kind of generating method not only increase the contact ratio of worm gear sets, but also make the transmission mechanism more compact. In this research, the mathematical model of a worm gear set is developed based on the theory of gearing and the technique of computer aided design. The worm is generated by a disc-type grinding wheel and worm gear is generated by a fly-cutter. Based on the developed mathematical model, a computer graph of the worm gear set is presented. Besides, tooth contact analysis of the worm gear set is also performed to calculate the location of the contact points. Meanwhile, contact patterns and transmission errors of the worm gear set with assemble errors are also investigated. The analysis results are most helpful to the designers and manufacturers.