Patent ID: 8776736

Claim:
A variable compression ratio (VCR) apparatus, comprising: a piston; a connecting rod having one end coupled to the piston through a piston pin to transmit a motion of the piston to a crank shaft; a first eccentric link and a second eccentric link, each having one end eccentrically connected to the one end of the connecting rod through the piston pin; dual swing links, each having one end connected to the other end of the first eccentric link or the other end of the second eccentric link to pivot the eccentric links with respect to the piston pin; and a connecting assembly connecting the one end of the first eccentric link and the one end of the second eccentric link to each other; wherein the connecting rod has an assembling hole formed through the one end thereof, and wherein the connecting assembly includes: a circular boss foamed in the one end of the first eccentric link and protruding to be inserted into the assembling hole; and a plurality of assembling protrusions formed in the one end of the second eccentric link and arranged in a circumferential direction so as to be closely attached to an outer circumference of the boss.