Patent ID: 9260983
Filing Date: 2016-02-16
CPC Classification: F01L

Claim Text:
1. A valve control apparatus for an internal combustion engine, comprising: a first engine valve biased in a closing direction of the first engine valve by a biasing force of a first valve spring; a second engine valve biased in a closing direction of the second engine valve by a biasing force of a second valve spring; a first drive cam provided on a drive shaft and configured to rotate integrally with the drive shaft, the drive shaft being configured to rotate in synchronization with a crankshaft; a second drive cam provided on the drive shaft and configured to rotate integrally with the drive shaft; a swing cam configured to swing; a transmission mechanism configured to convert a rotational motion of the first drive cam into a swinging force and to transmit the swinging force to the swing cam; a first swing arm configured to open the first engine valve by being pressed by a swing of the swing cam; a second swing arm configured to open the second engine valve by being pressed by a rotation of the second drive cam; a control mechanism configured to vary a swing amount of the swing cam by varying an attitude of the transmission mechanism; and a connection changeover mechanism configured to connect and disconnect the first swing arm with and from the second swing arm, wherein a lift characteristic of the second engine valve as determined by the configuration of the second swing arm for opening the second engine valve by being pressed by the second drive cam is one fixed lift curve, and wherein the one fixed lift curve has a lift amount and a working angle which are smaller than a minimum lift amount and a minimum working angle within a lift characteristic of the first engine valve as determined by the configuration of the first swing arm for opening the first engine valve by being pressed by the swing cam.