Patent ID: 8468984
Filing Date: 2013-06-25
Classification: F02B,F02D

Abstract:
1. A variable compression ratio apparatus including an external piston, a piston pin mounted in the external piston, a crankshaft, and a connecting rod pivotally connecting the external piston with the crankshaft, the apparatus comprising: an internal piston including a slot and sliding up or down in close contact to an interior circumference of the external piston, wherein the piston pin passes through the slot of the internal piston and the external piston; a latching pin passing through the piston pin and selectively sliding therein; variable sliders disposed to selectively contact one of both ends of the latching pin, at both sides thereof to push the one of the both ends to the opposite side; and a support plate slidably supporting the variable sliders such that the variable sliders reciprocate in perpendicular direction to the length direction of the latching pin; wherein one end of a connecting arm selectively rotating is connected to the variable slider and a sliding direction of the variable sliders is controlled by rotation of the connecting arm; wherein an oil chamber is formed between the inside of the external piston and the top of the internal piston so as to selectively store oil therein to generate hydraulic pressure; and wherein a control channel is formed in the latching pin to receive oil from the oil supply channel formed in the connecting rod and oil in the control channel is selectively supplied into the oil chamber by reciprocation of the latching pin.