Patent ID: 7966982
Filing Date: 2011-06-28
Classification: F01L

Abstract:
1. A fixation structure for a valve system rotation shaft of an internal combustion engine, the fixation structure being designed to rotatably fix a camshaft for driving an engine valve mounted on a cylinder head of the internal combustion engine to the cylinder head through the use of a lower cam holder and a cam cap, and to fix the lower cam holder, which is formed separately from the cylinder head, to the cylinder head, comprising: a holder fixation section formed in the cylinder head for securing the lower cam holder; and a cover connection section for connecting a base end of an external wall of a head cover at the peripheral side of the holder fixation section; said cover connection section extends toward the head cover rather than toward the holder fixation section in a manner so as to cover the circumference of the lower cam holder fixed to the holder fixation section; and a connection to the holder fixation section is established with the base end of the external wall of the head cover abutted on a leading end of the cover connection section.