| 摘要 |
PROBLEM TO BE SOLVED: To optimize especially a supporting structure of a control shaft to the cylinder head, with the control shaft positioned higher than a driving shaft on the upper side of the cylinder head, in the supporting structure of a variable valve train to the cylinder head, arranged on the upper side of the cylinder head. SOLUTION: The control shaft 5 of a lift/operating angle varying mechanism 2 being the variable valve train is rotatably supported by a control shaft bearing wall 21 and a bearing cap 15. The control shaft bearing wall 21 has: a control shaft bearing part 22 composing a bearing for the control shaft together with the bearing cap 15; and a partition wall part 23 whose both ends in the width direction of the cylinder head 1 project to further outer side of the control shaft bearing part 22. The end part of a cap fastening bolt 14 fastening the bearing cap 15 to the control shaft bearing part 22 reaches the partition wall part 23. Screw meshing force generated in the end part of the cap fastening bolt 14 is thereby received by the partition wall part 23 wider than the control shaft bearing part 22, and screw meshing stress applied to the control shaft bearing wall 21 is relatively reduced. COPYRIGHT: (C)2008,JPO&INPIT
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