Abstract
At present, many gears have involute tooth profiles which are easy to manufacture and are able to maintain constant gear speed even when the center distance changes. However the involute tooth profile has some disadvantages: it causes a high contact stress by meshing with two convex surfaces, and it also generates an undercut when gears have a small number of teeth. On the other hand, a cycloid tooth profile gear is also able to transmit a uniform motion. The cycloid tooth profile gear has greater tooth surface strength (except at the pitch point) due to the mesh with the convex and the concave surfaces, and it also has high bending strength. In this study, we investigated the wear of a cycloid tooth profile gear, using a power circulating-type gear testing machine, and measure the change in tooth profile of the test gears. Furthermore, we develop a computer program to predict the amount of the wear on the tooth surface for the spur gears. The method employs two equations: one based on Soda's wear model under lubricated condition; the other derived from the ploughing wear model. Using these equations, the wear depth on the tooth surface was calculated with changing of the contact stress, the sliding velocity, the oil film thickness, etc. The calculated value of the wear agreed with the experimental result.
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