Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
In order to confirm the effect of the difference in module sizes of micro-cross-helical-gears on the load-carrying-capacity, we compare the failure modes of module 0.1 mm and module 0.2 mm. We carried out acceleration endurance test on a micro-cross-helical-gear under the lubricant dropping condition only at the start of the experiment. As a result, in case of module 0.2 mm, extremely minute wear powder was spread thinly over the entire tooth surface, which was quite different from the tendency of wear powder in modules 0.1 mm. Micro-crossed-helical-gear of module 0.2 mm had failed tooth tips due to progressive wear, module 0.1 mm showed progressive wear, but did not experience failures at the tooth tips. This is most likely due to the influence of the micro-crossed-helical gear specifications, especially the same tooth width. A comparison was also made in terms of the area of the contact ellipse, and it was found that the increase in contact area per step was larger for the module 0.2 mm. This means that the maximum Hertzian pressures increase per step is also larger, and the magnitude of the load applied to the tooth surface during a single test is also different for each module. Therefore, differences in modules may affect the area of the contact ellipse and the associated maximum Hertzian pressure, which may also have an effect on lifetime.
