(57) A valve driving apparatus using a direct driving type valve lifter is disposed between
a cam (803) and a valve (105,117,118,217,317,417,517,617,717,807), said apparatus
comprising: a guide hole (123,213,313,413,513,613,713,806) and a direct driving type
valve lifter (101,214,314,414,514,614,714,811) including a tappet portion (103,216,316,416,516,616,716,813),
and a guide portion (104,215,315,415,515,615,715,812) having one end portion coupled
to said tappet portion and housed within said guide hole so as to slide freely therein
to the axial direction of said poppet valve in an interlocked manner; wherein a diameter
(r) of said guide portion is formed to be smaller than a diameter (R) of said tappet
portion; characterized in that said valve lifter (101,214,314,414,514,614,714,811)
is inclined in a direction perpendicular to a rotational axis of the cam relative
to the head bolt (109) for securing the cylinder head; and said valve lifter is arranged
so as to be adjacent to the head bolt in a planar view.
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