PROBLEM TO BE SOLVED: To prevent only an edge part from being in contact with a cam surface so as to prevent stripe traces from being formed on the cam surface by protrudedly forming the height distribution of an area in contact with the sliding surface of a cam follower of a three dimensional cam, even if there exist a manufacturing error, in place of forming it linearly. ;SOLUTION: The cam surface 11a of an intake side cam is designed so that its tangential line 46 is formed protrudedly. By this, the edge part of a cam follower is not brought in contact strongly with the cam surface 11a, and the cam surface 11a is not damaged by the edge part. As a result, the edge part of the cam follower is not caught by the strap traces when the intake side cam is moved in its axial direction, and the switchover of the opening and closing timing and lift amount of the intake valve can be maintained smoothly.;COPYRIGHT: (C)1999,JPO
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