| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject structure capable of efficiently reducing its weight while having a ballanced torsional rigidity by forming a hollow hole for reducing the mass thereof that is provided to a crankpin in a shape for improving the balance of the rigidity through equalization of shearing stress generating in a crankshaft. SOLUTION: In a crankshaft structure formed with mass reducing hollow holes 10a, 10b extending toward the center of a crankpin 22 from a shoulder 34 of a crankarm 34 of a crankshaft 20, the holes 10a, 10b are formed in such a way that axes Xa, Xb of the holes 10a, 10b are inclined so that wall thicknesses on the sides A1, A2 where a maximum shearing stressτt generates when a maximum torsional torque TAmax acts may be thicker than wall thicknesses on the sides B3, B4 where a shearing stressτc generates when a minimum torsional torque TCmin acts.
|
