Patent ID: 6499454
Filing Date: 2002-12-31
Classification: F01L

Abstract:
A variable-valve-actuation (VVA) apparatus for an internal combustion engine, comprising:a driving shaft that rotates in synchronism with a crankshaft; a crank cam arranged at an outer periphery of the driving shaft; a valve operating (VO) cam which actuates an engine valve in accordance with a swing motion; and a rocker arm having an end swingably mounted to an eccentric control cam at a first pivotal point, the rocker arm being rotatably mounted to the crank cam and the VO cam at a second pivotal point and a third pivotal point, respectively, the rocker arm transmitting a driving force of the crank cam to the VO cam by operation of the swing motion, wherein a lift of the engine valve produced by the VO cam being varied by changing a rocking fulcrum of the rocker arm through rotation control of the control cam, and wherein the second pivotal point and the third pivotal point being located on the side of another end of the rocker arm, the second pivotal point and the third pivotal point being disposed adjacent to each other.