eixo de manivela para motor alternado e método de projeto do mesmo

a presente invenção refere-se a eixos de manivela a serem montados em motores alternados tais como motores automotivos, motores marinhos e motores de múltiplos propósitos usados, por exemplo, em geradores de energia, bem como a um método para projetar esses eixos de manivela. Each of Crank arms (A) of a crankshaft has an asymmetric shape with respect to a crank arm centerline (Ac) connecting an axis of the crank pin (P) to an axis of the journal (J), and each of the crank arms has a maximum flexural rigidity at a point of time when the load onto the crank pin due to the combustion pressure reaches a maximum. When each of the crank arms (A) is divided by the crank arm centerline (Ac) into a right arm portion (Ar) and a left arm portion (Af), in each section of each of the crank arms (A) on a plane perpendicular to the crank arm centerline (Ac) at a position outward of the axis of the crank pin (P), an area moment of inertia of one of the right and the left arm portions that is in a side that is subjected to the maximum load is greater than an area moment of inertia of the other arm portion that is in a side opposite to the side that is subjected to the maximum load, and in each section of each of the crank arms (A) on a plane perpendicular to the crank arm centerline at a position inward of the axis of the crank pin (P), the area moment of inertia of the arm portion that is in the side opposite to the side that is subjected to the maximum load is greater than the area moment of inertia of the arm portion that is in the side that is subjected to the maximum load. The crankshaft has an increased flexural rigidity and a reduced weight.