A crankshaft for a v-type internal combustion engine

Details A crankshaft for a v-type internal combustion engine A crankshaft for a v-type internal combustion engine

F - Mech Eng,Light,Heat,Weapons

16

C

F16C 3/20 (2006.01) F16F 15/24 (2006.01)

Patent

CA 2486201

A crankshaft (1) includes a first to a sixth crank pin (4146), a first to a fourth main journal (21-24) and a first to a ninth crank arm (61-69). At least the first, the second, the eighth and the ninth crank arms (61, 62, 68, 69) have respective integral counterweights (61', 62', 68', 69') for balancing the crankshaft (1). In order to reduce bending stress on the areas where the second and the eighth crank arms (62, 68) are connected to the respective pairs of adjacent crank pins (41-42, 45-46), the axial dimensions of the first and the ninth crank arms (61, 69) are reduced, being substantially the same as those of the adjacent crank arms (62 , 68) in order that the axial length of the two end spans of the crankshaft is the same as that of the intermediate span. In order to balance the crankshaft (1), two additional counterweights (71, 72) are arranged outwardly of the end journals (21, 24) and their axial dimensions are comparable to those of the end crank arms (61, 69).

Le vilebrequin (1) selon la présente invention comprend six manetons (41-46), quatre tourillons principaux (21-24) et neuf bielles (61-69). Au moins les première, seconde, huitième et neuvième bielles (61, 62, 68, 69) présentent des contrepoids (61', 62', 68', 69') solidaires par construction, respectifs, permettant d'équilibrer le vilebrequin (1). Afin de réduire la contrainte de flexion sur les zones où les seconde et huitième bielles (62, 68) sont reliées aux paires respectives de manetons adjacents (41-42, 45-46), les dimensions axiales des première et neuvième bielles (61, 69) sont réduites, de manière à être sensiblement identiques à celles des bielles adjacentes (62, 68), de sorte que la longueur axiale des deux portées d'extrémités du vilebrequin est identique à celle de la portée intermédiaire. Afin d'équilibrer le vilebrequin (1), deux contrepoids (71, 72) supplémentaires sont situés à l'extérieur des tourillons d'extrémité (21, 24) et leurs dimensions axiales sont comparables à celles des bielles d'extrémité (61, 69).

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