公开(公告)号：US20170284240A1

公开(公告)日：2017-10-05

申请号：US15473992

申请日：2017-03-30

Applicant: HONDA MOTOR CO., LTD.

Inventor： Yoshihiro TAKADA ,  Dai KATAOKA

IPC: F01L13/00 ,  F01L1/053

CPC classification number: F01L13/0063 ,  F01L1/022 ,  F01L1/026 ,  F01L1/053 ,  F01L1/185 ,  F01L13/0047 ,  F01L2001/0537 ,  F01L2013/0052 ,  F01L2013/105 ,  F01L2810/02

Abstract: An engine variable valve train includes a cam changeover mechanism for axially shifting a cylindrical cam carrier fitted on and around a camshaft for changing over cam lobes on the cam carrier to cause one of the cam lobes to selectively act on an engine valve for engine operation. The cam changeover mechanism includes changeover pins adapted to be advanced and retracted for engagement with or disengagement from a lead groove formed around the cam carrier, and with a changeover driving shaft constituting a linear motion cam mechanism for causing the changeover pins to selectively advance to engage with the lead groove. The cam carrier, while rotating with the cam shaft, is axially shifted by the action of the lead groove having the changeover pins selectively engaged therewith, so that the cam lobes are changed over and one of the cam lobe is made to act on the engine valve.