VIERZYLINDER-REIHENMOTOR FÜR FAHRZEUG UND MIT DEM MOTOR VERSEHENES FAHRZEUG

摘要

[Problem] To improve a degree of freedom in designing an engine, improve an acceleration feeling and make a driving sense extremely good as well as to make the engine compact. [Means for Resolution] A two-plane type crankshaft 3 is provided. The weight of crank webs for the respective cylinders is divided between left and right half webs (1a and 1b to 24a and 24b) and balance ratios k L and k R of the half webs for the respective cylinders are set so as to be (k L - 0.25) · (0.25 - k R ) ‰ D R / D L to form a track of a vector of a primary inertial couple into a substantial circle. A primary balancer 6 offsets the primary inertia couple.