Patent ID: 9347342
Filing Date: 2016-05-24
CPC Classification: F01L

Claim Text:
1. A valve gear of an engine, comprising: a camshaft having a shaft portion and a cam element portion, the cam element portion being coupled to the shaft portion so as to rotate integrally with the shaft portion and to move in an axial direction of the shaft portion; and an operational device operative to move the cam element portion of said camshaft in the axial direction relative to the shaft portion, wherein said cam element portion comprises two cam portions for each valve which have a common base circle and different-shaped nose portions, which are provided adjacently to each other in the axial direction, the two cam portions operative to control opening/closing of the valve being configured to be switchable when moved in the axial direction on the shaft portion, said cam element portion further comprises an end-face cam which is provided at an end face, in the axial direction, of the cam element portion, the end-face cam having a lift portion which is configured to project in the axial direction such that the amount of projection of the lift portion increases gradually along a rotational direction of the cam element portion in a specified phase range, said operational device comprises an operational member which is arranged beside said cam element portion, the operational member being configured to be driven by an actuator so as to take an operative position in which the operational member projects to a position facing said end-face cam of the cam element portion and contacts the lift portion of the end-face cam so as to move the cam element portion along the shaft portion in an opposite direction to an arrangement side of said operational member, and a retreat position in which the operational member retreats from said position facing the end-face cam, and said cam element portion further comprises a slant portion, the slant portion being positioned on a rotary-delay side from a maximum-lift portion of the end-face cam and slanting inward toward the rotary-delay side from an outer peripheral face of the end-face cam.