Variable valve operating apparatus for internal combustion engine

摘要

A variable valve operating apparatus for an internal combustion engine includes a drive camshaft, and a driven cam lobe that is rotatably supported by the drive camshaft. The variable valve operating apparatus further includes a control sleeve that has a raceway surface, a center of which is eccentric with respect to a center of rotation of its own. The variable valve operating apparatus further includes a link mechanism that is connected to each of the drive camshaft and the driven cam lobe and has a control roller which is in contact with the raceway surface. The variable valve operating apparatus further includes an actuator that drives the control sleeve. The variable valve operating apparatus further includes a control amount of the actuator is controlled to change a moving amount of the raceway surface in the above described plane direction in accordance with an operation condition of an internal combustion engine.

主权项

1. A variable valve operating apparatus for an internal combustion engine, comprising:
a drive camshaft that is rotationally driven by a rotational force of a crankshaft; a driven cam lobe that is concentric with the drive camshaft, and is rotatably supported by the drive camshaft; a guide member that has a raceway surface formed so as to surround the drive camshaft; a link mechanism that is connected to each of the drive camshaft and the driven cam lobe, has a contact member which is in contact with the raceway surface, and changes a rotation angle of the driven cam lobe with respect to the drive camshaft in association with a positional change of the contact member with respect to a center of rotation of the drive camshaft; a contact maintaining device that maintains contact between the contact member that revolves around the drive camshaft and the raceway surface, while the drive camshaft makes one rotation; an actuator that moves the raceway surface in a plane direction orthogonal to an axial line of the drive camshaft; and a controller that is configured to control a control amount of the actuator to change a moving amount of the raceway surface in the plane direction, in accordance with an operation condition of the internal combustion engine, wherein, in a state in which a center of the raceway surface is eccentric from a center of rotation of the drive camshaft, a distance of the contact member with respect to the center of rotation of the drive camshaft is changed while the drive camshaft makes one rotation.