METHOD FOR SETTING ECCENTRICITY OF CARDAN JOINT, AND PROPELLER SHAFT HAVING THE CARDAN JOINT

摘要

PROBLEM TO BE SOLVED: To reduce the primary vibromotive force of the thrust, and to realize low vibration and noise level. ;SOLUTION: In an eccentricity setting method of a Cardan joint, a first shaft S1 provided with a first yoke Y1 arranged opposite to a shaft end, a second shaft S2 provided with a second yoke Y2 arranged opposite to the shaft end, and a spider SP which is turnably connected to the first yoke and the second yoke. The eccentricity of the spider Sp is set so that the eccentricity Δ₂ of the spider SP in the opposite direction of the second yoke Δ₂ is larger than or equal to the eccentricity Δ₁ of the spider SP in the opposite direction to the first yoke Yl when (k₁-I₁ω²) is larger than or equal to (k₂-I₂ω²)γ² where k₁ is the pitching rigidity, I₁ is the pitching inertia, l₁ is the shaft length of the first shaft S1, k₂ is the pitching rigidity, I₂ is the pitching inertia, l₂ is the shaft length of the second shaft S2, ω is the rotational angular velocity of the first and second shafts, and γ=l₁/l₂.;COPYRIGHT: (C)1997,JPO