Patent ID: 6295962
Filing Date: 2001-10-02
Classification: F02B,F16F,Y10T

Abstract:
A crankshaft and piston arrangement for a combustion engine, comprising a piston pivotally connected to a crankshaft by a connecting rod, and two balance means each comprising a balance means connecting rod connected to the crankshaft and a balance arm having a longitudinal axis and pivotally connected to the balance means connecting rod, the balance arm being pivotally connectable at an end remote from the balance means connecting rod to the engine and wherein the longitudinal axes of the balance arms extend in substantially opposite directions to one another and are substantially perpendicular to a plane through the crankshaft rotational axis (C) and centre of the piston when the piston is at substantially mid-stroke, and rotate in opposite directions to one another in use, and each balance means is substantially diametrically opposed to a piston with respect to the crankshaft rotational axis thereby operably to balance forces generated by the acceleration and deceleration of the piston in use, and the L/R ratios for the piston connecting rod and the balance means connecting rod are substantially equal, wherein the balance mass is substantially provided in the region of the balance means connecting rod thus to produce a force substantially equal in magnitude to the force generated by the motion of the piston.