Cylindrical Worm Gear Research Articles

A New Type Double-Enveloping Worm Gears : 1st Report, Fundamental Analysis on the Tooth Engagement Action

The author designed a new type double-enveloping worm gears. In this new type the worm is a conventional hourglass worm, but the number of teeth of the worm wheel and the center distance are smaller than the conventional type. In this paper the design principle is presented. With Hindley type worms, surfaces of action or lines of contact of the new worm gears are theoretically obtained and compared with those of the following two types of worm gears : (1) the cylindrical worm gears having a worm thread of a straightsided axial section. (2) the Hindley worm gears. The following conclusion is obtained. It may be considered that the new worm gears is a general form of the above mentioned two types of the conventional worm gears, and can be properly designed to circumvent the defects of the latter two types without sacrificing the desirable features as a worm gears.

A New Type Double-Enveloping Worm Gears : 2nd Report, Sample Gears and Equipments for the Performance Test

In the 1st report a fundamental analysis on the tooth engagement action of the new worm gears is presented. In order to confirm the practicability of this new worm gears, an experiment comparing performances of this worm gears with those of a well-known "Cone Drive Gears" and a conventional cylindrical worm gears is planned. In this report, preparations of these sample gears and equipments such as the worm gear performance tester, the torque meters and the wear measuring instrument are described. Results of the experiment will be reported in the succeeding reports.

Proposal for a Standard Design for General Industrial Coarse-Pitch Cylindrical Worm Gearing

Abstract This paper suggests a method of standardizing general industrial coarse-pitch cylindrical worm gear drives, particularly the worm diameter and tooth proportions, to eliminate the present situation where no recognized standard exists. The suggestions contained in this paper do not insist on a single worm diameter for each pitch or center distance but rather a limited group of worms that will cover the range of good design.