Patent ID: 6349684
Filing Date: 2002-02-26
Classification: F01B,F16H

Abstract:
A crank-connecting rod mechanism for an internal combustion engine or the like having a compression stroke and an expansion stroke, comprising an assembly of:a shaft rotating about its axis; a first crank fixed to said shaft; a crank pin fixed to said first crank, which extends parallel to but at a first radial distance from said shaft; a second crank rotatably mounted on the first crank pin, which is fixed to a second crank pin having an axis at a second radial distance from the axis of the first crank pin, wherein the first and second cranks are in such relative positions that, at an uppermost point of the compression stroke, the first crank is positioned at 0Â° and the second crank is positioned at substantially 90Â° such that the first and the second cranks are both positioned at substantially 180Â° at the end of the expansion stroke; a connecting rod which is rotatably mounted on the second crank pin; and rotary means for causing the second crank to rotate relative to the first crank upon rotation of the shaft, wherein the rotary means is so arranged that the second crank rotates at half the speed, albeit in an opposite direction, of the first crank.