Abstract
This report introduces a numerical method for calculating the tooth bearing and the angle trans-mission accuracy in worm gears. In this method, the tooth surface of the worm wheel is represented by the set of points on lines of contact between the basic helicoid of the hob and the worm wheel surface. Taking account of the case where edge contact occurs, the worm wheel surface is limited by contour lines of the worm wheel. The clearance between the surface of worm wheel and that of worm is defined to be measured along the circumference of the wheel. By using the clearance, the tooth bearing and the angle transmission accuracy are calculated. The experimental measuring device is also introduced. On this device, worm gears can be placed according to the mounting dimensions, which can be varied to cause intentional errors of the center distance, the axial position of wheel and the shaft angle. As an example, the tooth modified worm gears, the worm of which is finish-ground, is taken. It is shown that the calculated results agree with the experimental ones.
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