Patent ID: 7383803
Filing Date: 2008-06-10
Classification: F01L,Y10T

Abstract:
1. A valve timing control device for an internal combustion engine comprising: a driving rotational member driven by a crankshaft of the engine; a driven rotational member connected to an intake camshaft to transmit 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; an installation-angle adjusting mechanism comprising a movable operating member 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 the movable operating member 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 the movable operating member created by accelerating and decelerating rotary motion of the plate with respect to the driving rotational member depending on an energizing-and-deenergizing state of an electromagnetic-force generator, the plate being rotated to adjust the installation angle between the driving and driven rotational members to a phase-retard side, when the electromagnetic-force generator is kept in its deenergized state.