| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and lightweight direct acting valve system capable of reducing a rotational axis directional dimension when fitting a switching means and a cam piece for adjacently arranging plural cams different in a cam profile in the rotational axis direction of a camshaft. SOLUTION: This direct acting valve system of an internal combustion engine has the cam piece 30 having first and second cam parts 37a and 37b adjacently arranged on the low speed cams 38a and 38b and the high speed cams 39a and 39b different in the cam profile, valve lifters 32a and 32b, and a driving piston 50 for selectively switching the cams for slidingly contacting with slipper parts 43a and 43b of the valve lifters 32a and 32b. Recessing cutout parts 42a1, 42a2 and 42b2 to the high speed cams 39a and 39b and a pair of arms 54a and 54b of the driving piston 50 in a noncontact state to the valve lifters pressed by sliding contact of the low speed cams 38a and 38b, are formed in the valve lifters 32a and 32b by a through-hole. |
