Patent ID: 7753018

Claim:
A valve timing control device for an internal combustion engine comprising: a driving rotational member configured to be driven by a crankshaft of the engine; a driven rotational member configured to be connected to an intake camshaft for transmitting a torque from the driving rotational member to the driven rotational member; a plate rotatable relative to each of the driving and driven rotational members, the plate having a guide whose diameter reduces in a circumferential direction; a plurality of movable operating members engaged with the guide to be displaceable along the guide, for varying an installation angle between the driving and driven rotational members by way of movement of each of the movable operating members in a substantially radial direction of the camshaft; and a speed increasing-and-decreasing mechanism adapted to adjust the installation angle between the driving and driven rotational members by way of the radial movement of each of the movable operating members, created by accelerating and decelerating rotary motion of the plate relative to the driving rotational member.