Patent ID: 7185615
Filing Date: 2007-03-06
Classification: F01L,F02B,F02D

Abstract:
1. A variable stroke engine comprising: a connecting rod having one end connected to a piston via a piston pin; a sub-rod connected to a crankshaft via a crankpin and connected to the other end of the connecting rod; a control rod connected at one end to the sub-rod at a position distal from a position where the sub-rod is connected to the connecting rod, the control rod having an arcuate body and a shaft hole defined at the other end of the control rod; and an eccentric shaft connected to the other end of the control rod, wherein the eccentric shaft is provided at a position eccentric relative to a rotating shaft to which power is transmitted from the crankshaft at a reduction ratio of ½, wherein an intake cam and an exhaust cam, which are separate and distinct from each other, are provided on the rotating shaft, wherein the valve operating mechanism includes the intake cam, the exhaust cam, first and second lifters, first and second pushrods, and first and second rocker arms, wherein the first pushrod is provided between the intake cam and the first rocker arm, and the second pushrod is provided between the exhaust cam and the second rocker arm, wherein the intake cam, the exhaust cam, and the eccentric shaft, which is disposed between the intake and exhaust cams, are integrally provided on the rotating shaft, and wherein outer diameters of the eccentric and rotating shafts are substantially equal to or less than an inner diameter of the shaft hole defined at the other end of the control rod and the outer diameter of the eccentric shaft covers an entirety of one of the intake and exhaust cams when viewed from a direction along an axis of the rotating shaft.