Patent ID: 8387573
Filing Date: 2013-03-05
Classification: F02D

Abstract:
1. A variable compression ratio device that includes a piston, a piston pin mounted to the piston, a crankshaft, and a connecting rod of which one end is connected to the piston by the piston pin and of which the other end is rotatably coupled to the crankshaft, the variable compression ratio device comprising: an eccentric ring rotatably coupled in a ring at the one end of the connecting rod, wherein the inner circumference thereof rotatably contacts with the outer circumference of the piston pin and the center of the inner circumference thereof is biased from the center of the outer circumference thereof; an operating pin that longitudinally reciprocates in the piston pin; variable sliders that selectively contact one of both ends of the operating pin under a cylinder to push the one of both ends to the opposite side; and a guide plate that slidably supports the variable sliders such that the variable sliders vertically reciprocate with respect to the movement direction of the operating pin, wherein, one end of a variable shaft selectively rotating is connected to the variable slider and a sliding direction of the variable slider is controlled by the rotation of the variable shaft.