| 摘要 |
A variable compression ratio device having a piston, a crankshaft, a connecting rod including a small end portion connected to the piston, may include a piston pin fixed to the connecting rod and fixed thereto, a receiving hole formed inside the piston and rotatably receiving the piston pin, wherein the receiving hole includes a convex portion and a concave portion, at least a variable pin slidably coupled to the piston pin and slidably coupled to the interior circumference of the receiving hole, wherein the at least a variable pin has a protrusion, and an oil supply passage selectively supplying oil to apply hydraulic pressure to the at least a variable pin, wherein the protrusion of the at least a variable pin is selectively coupled to the convex portion or the concave portion of the receiving hole.
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