Patent ID: 7472670

Claim:
A valve timing controller for an internal combustion engine which adjusts valve timing of at least one of an intake valve and an exhaust valve opened/closed by a camshaft on the basis of torque transmission from a crankshaft to the camshaft, comprising: a first rotational element rotating in association with the crankshaft; a second rotational element rotating in association with the camshaft; an external gear rotating integrally with the first rotational element; an internal gear performing a planetary motion while engaging with the external gear from a direction of an outer periphery of the external gear; a guide-rotational element relatively rotating to the first rotational element by receiving the planetary motion of the internal gear, the guide-rotational element being provided with a guide-groove having a constant width and extending on the guide-rotational element; a moving element engaging with the guide-groove in such a manner as to slide therein when the guide-rotational element relatively rotates to the first rotational element; and a phase changing means including a first arm member connected to the first rotational element by a revolute pair, and a second arm member connected to the second rotational element by a revolute pair and the first arm member by a revolute pair through the moving element, the phase changing means changing a relative rotational phase between the first rotational element and the second rotational element by moving the moving element to rotate the first arm member and the second arm member; wherein when the guide-rotational element relatively rotates with respect to the first rotational element, the guide-groove biases the moving element in a direction in which the moving element slides with respect to a radial line connecting a center of the guide-rotational element and the moving element.