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in life as the geometry is changed from the optimum. Fig. 8 shows the variation in drive life and component lives with location on the ratio constraint boundary. The maximum life is achieved as a trade-off among the component lives. The sun and driven track of the first row rollers increase in life while the remaining components decrease in life as B and C increase. The loss of life for the smaller values of (B, Q was due to high stress on the high-speed sun element. The loss of life at the higher values of (B, Q was due to high stress caused by less effective toggle action and the resultant need for higher normal loads to preclude slip at the planet/planet and planet/ring contacts. The multiroller traction drive reported in [5] had a [B/d6, C/d6] = [0.322, 0.194]. The calculated drive life was 94 percent of the optimum.

journal of mechanical design

Discussion: “Constrained Fatigue Life Optimization of a Nasvytis Multiroller Traction Drive” (Coy, J. J., Rohn, D. A., and Loewenthal, S. H., 1981, ASME J. Mech. Des., 103, pp. 423–428)