Patent ID: 8997705
Filing Date: 2015-04-07
Classification: F01L,Y10T

Abstract:
1. A variable valve actuation apparatus of an internal combustion engine configured to vary an operating characteristic of an engine valve permanently biased in a direction closing of the engine valve by a valve spring, by changing an angular position of a second member relative to a first member, comprising; an electric motor in which a state of rotation of the electric motor is controlled responsively to a control signal; an eccentric rotation member configured to rotate eccentrically with respect to a center of rotation of an output shaft of the electric motor by torque transmitted from the electric motor; an inner peripheral meshing member integrally connected to one of the first and second members and having an internal toothed portion formed on its inner periphery; a plurality of rolling elements rotatably installed on an outer peripheral surface of the eccentric rotation member and circumferentially arranged substantially at regular intervals, and configured such that a meshing point of the plurality of rolling elements with the inner peripheral meshing member circumferentially shifts by eccentric rotary motion of the eccentric rotation member; and a cage integrally connected to the other member of the first and second members and having a plurality of lugs for circumferentially partitioning the respective rolling elements, while permitting a radial displacement of each of the rolling elements, wherein a radial clearance C