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1.曲轴单拐在对称弯曲载荷作用下,实心单拐的最大弯曲应力发生在轴颈过渡圆角单拐对称面处。在等弯矩下|σ_L|>|σ_z|,在三角形弯矩下|σ_L|<|σ_z|。2.当轴颈为圆柱形空心时,随着主轴颈空心度的增加,连杆轴颈圆角处最大弯曲应力σ_(Lmax)逐渐下降,且其峰值点逐渐向对称面两侧偏移,在空心度K≤0.6时,偏移角ψ≤25°,而主轴颈圆角处最大应力σ_(Zmax)则相应增加,但峰值点不变。同样,随着连杆轴颈空心度的增加,σ_(Zmax)逐渐降低,且峰值点向两侧偏移,在空心度K≤0.6时,偏移角ψ≤25°,而σ_(Lmax)则相应增加,但峰值点不变。当两者同为空心时,在空心度K≤0.5时,σ_(Lmax)和σ_(Zmax)同时降低,K>0.5以后则同时回升,峰值点也同时向对称面两侧偏移,当空心度K≤0.6时,偏移角ψ≤30°。
1. Crankshaft single-turn Under the symmetrical bending load, the maximum bending stress of solid single-turn occurs at the single-turn symmetry plane of journal transition fillet. Under constant bending moment | σ_L |> | σ_z |, under the triangular bending moment | σ_L | <| σ_z |. When the journal is a cylindrical hollow, the maximum bending stressσ_ (Lmax) at the fillet of the connecting rod journal gradually decreases with the increase of the hollowness of the main journal, and its peak point gradually shifts to both sides of the symmetry plane. When the hollow degree K≤0.6, the deviation angle ψ≤25 °, while the maximum stress σ_ (Zmax) at the main journal fillet increases correspondingly, but the peak point does not change. Similarly, with the increase of hollowness of connecting rod journal, σ_ (Zmax) gradually decreases and the peak points deviate to two sides. When the hollow degree K≤0.6, the deviation angle ψ≤25 ° and σ_ (Lmax) The corresponding increase, but the peak point unchanged. When the two are both hollow, σ Lmax and σ Zmax both decrease when the hollow degree K is less than or equal to 0.5. When K> 0.5, they return at the same time, and the peak points are also offset to both sides of the symmetry plane. Degree K ≤ 0.6, the offset angle ψ ≤ 30 °.