Patent ID: 7100556

Claim:
A variable valve timing controller for an internal combustion engine, the variable valve timing controller being disposed in a system in which torque of a driving shaft is transmitted to a driven shaft adjusting an opening and closing timing of an intake valve and/or an exhaust valve, comprising: a phase adjusting mechanism that includes a first rotating member rotating in synchronization with the driving shaft, a second rotating member rotating in synchronization with the driven shaft around a rotating center which is common to the first rotating member, a first arm pivoting on the first rotating member to form a revolute pair, and a second arm pivoting on the second rotating member and the first arm to form revolute pairs; and a control means adjusting the relative rotational phase between the first rotating member and the second rotating member by controlling a movement of the revolute pair formed by the first arm and the second arm wherein the revolute pair formed by the first arm and the first rotating member is defined as a first pair, the revolute pair formed by the second arm and the second rotating member is defined as a second pair, and the revolute pair formed by the first arm and the second arm is defined as a third pair, a distance between the first pair and the third pair is defined as a distance L1, a distance between the second pair and the third pair is defined as a distance L2, and a ratio L1/L2 is established within a range of 0.5 to 2.