Patent ID: 8397683

Claim:
A variable compression ratio device for an internal combustion engine, comprising: a rotatable control shaft configured to selectively vary a compression ratio of the internal combustion engine in accordance with a rotational displacement; a plurality of links that connect a piston of the internal combustion engine to a crankshaft; a control link that connects one of the plurality of the links to an offset point that is offset from a rotation axis of the control shaft, the control link rotating with respect to the control shaft; a linear actuator comprising a housing and an actuator rod that elongates and contracts relative to the housing; and a connecting link that connects the control shaft to the actuator rod, the connecting link being rotatably connected to the control shaft via a first connecting pin having a center axis offset from the rotation axis of the control shaft, and the connecting link being rotatably connected to the actuator rod via a second connecting pin disposed parallel to the first connecting pin.