This article deals with the effects of the contact ratio ε on transmission errors of trochoidal gears (which consist of a roller gear anda cam gear). First, the experiments and multibody analysis (MBA) for the transmission errors of two types of single-row trochoidal gears (types A and B gears) were carried out. The type A gear is a commercial trochoidal gear with ε = 1.1 and the type B gear is a trochoidal gear with ε = 2.1 (by increasing the number of teeth). The experimental and MBA results showed that the peak-to-peak value TEP-P of the transmission errors of the type B gear (with ε = 2.1) was lower than the type A gear (with ε = 1.1). The TEP-P of types A and B gears increased as the rotational speed of the roller gear increased. However, the increasing rate of the measured TEP-P of the type B gear due to an increase of the rotational speed was less than that of the type A gear. Increasing the contact ratio due to an increase in the number of teeth in a single-row trochoidal gear (such as a type B gear) decreases the strength of the teeth and rollers. To overcome this problem, as a new transmission error reduction method, a double-row trochoidal gear (type C gear), having two times the contact ratio of the type A single-row trochoidal gear was presented and its transmission error was examined. The experimental and MBA results showed that the TEP-P of the transmission errors of the type C double-row trochoidal gear were lower than that of the type A single-row trochoidal gear. Therefore, it is clear that using a double-row trochoidal gear is effective for reducing the transmission errors of trochoidal gears.
Effects of Contact Ratio on Transmission Errors of Trochoidal Gears
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 14, 2013; final manuscript received February 20, 2014; published online April 1, 2014. Assoc. Editor: Mihai Arghir.
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Ohta, H., Kurita, M., and Kishi, K. (April 1, 2014). "Effects of Contact Ratio on Transmission Errors of Trochoidal Gears." ASME. J. Tribol. July 2014; 136(3): 031101. https://doi.org/10.1115/1.4027130
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