Patent ID: 9458742
Filing Date: 2016-10-04
CPC Classification: F01L

Claim Text:
1. A variable valve mechanism for an internal combustion engine, the variable valve mechanism comprising: a control shaft configured to be displaced in an axial direction of the control shaft, the control shaft being configured to change a maximum lift amount of an engine valve of the internal combustion engine according to displacement of the control shaft in the axial direction; and a cam including a cam surface of the cam, the cam surface configured to abut with the control shaft, the cam being configured to displace the control shaft in the axial direction due to rotation of the cam, the cam surface including change zones and retention zones, the cam surface in the change zones being configured to change the maximum lift amount along with the rotation of the cam, the cam surface in the retention zones being configured to retain the maximum lift amount along with the rotation of the cam, respective lengths of the retention zones in a rotation direction of the cam being set such that respective length of the retention zones in the rotation direction increases as the maximum lift amount retained by the retention zones increases.