Patent ID: 8726858

Claim:
A variable compression ratio internal combustion engine comprising: a main engine body; a housing attached to a side wall of the main engine body; a variable compression ratio mechanism configured to vary an engine compression ratio according to a rotational position of a first control shaft that is rotatably disposed inside the main engine body; an actuator disposed outside of the main engine body and configured to vary and maintain the rotational position of the first control shaft; and a linking mechanism linking the actuator to the first control shaft, the linking mechanism being at least partially disposed outside of the main engine body and including a second control shaft rotatably supported to the housing by a bearing to rotate in conjunction with the first control shaft, the bearing including a pair of split bearing bodies having a halved structure that rotatably holds the second control shaft therebetween, and at least the split bearing body that is farther from the main engine body being configured as a separate member that is higher in rigidity than the housing; and the bearing being fixed to the side wall of the main engine body by fixing bolts that pass through both of the split bearing bodies and thread into the side wall of the main engine body.