Load Capacity of Polyacetal(POM)Internal Gears

―Issues of JIS B 1759 Appeared in Running Tests for Internal Gears―

Abstract

The present paper describes running tests of internal gears made of polyacetal. The results are analyzed on the basis of JIS B 1759 in order for their load capacity to be evaluated. As a result, polyacetal internal gears have much higher load capacity than external gears. Actual contact ratios, whose calculations include effects of tooth deformation, and smaller meshing losses in internal gears than external gears cannot explain the reason. In addition, the present paper presents key points to be considered in the design of the jig for internal gears to be tested.