Patent ID: 8857389

Claim:
An internal combustion engine, comprising: a crankshaft, said crankshaft being configured to transmit a rotational driving force to a valve gear; a cam driving gear mechanism including a driving gear and a driven gear, said driving gear and driven gear being configured to transmit the driving force by meshing with each other; an eccentric supporting shaft rotatably supporting at least one of the driving gear and the driven gear on an outer circumference thereof, said eccentric supporting shaft having a central axis eccentric with respect to a center of an access of rotation of the driving gear or the driven gear rotatably supported, said eccentric supporting shaft being configured in the internal combustion to be fixed at a predetermined rotational angle position about the central axis, and to adjust an amount of clearance between a pair of the driving gear and the driven gear; said internal combustion engine further comprising: a base shaft fixed therein, wherein the eccentric supporting shaft is fitted over the base shaft such that the central axis of the eccentric supporting shaft coincides with an axis of the base shaft; and a backlash adjusting device, said backlash adjusting device including an adjusting portion configured to allow an inner circumference of the eccentric supporting shaft to be fitted over an outer circumference of the base shaft at the predetermined rotational angle position with respect to the base shaft, and a fixing portion configured to fix the eccentric supporting shaft to the base shaft by a fixing device attached to the base shaft on the axis of the base shaft.