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Mechanical Engineering

JLDavis

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  1. For the gear head designer crowd.

     

    I am designing a reduction unit that is powered by a V8 engine which has torque impulses every 90 degrees. Nominal max torque is 600 ft lbs, so peak probably 1200 ft lbs. Spline in question is on the driven shaft so this sees 2400 ft lbs due to 2:1 reduction. Spline is 20/40 involute on a 2.25 Dia 4130 (assume 100kpsi tensile) hollow shaft. The max spline lengrth is 1.5 inches. Shaft splines drive a 7075 aluminum hub, assume 80K tensil strength. Here is the question, assuming 25 % spline engagement, what is the torque safety factor of the splined coupling? Your help and comments appreciated. BEST regards Jerry Davis

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