| 摘要 |
PURPOSE:To make suction and exhaust passages hermetically sealable positively at the time of valve closing as well as to improve the extent of engine performance, by forming at least two valve passages in these suction and exhaust passages, while installing spherical suction and exhaust valve interposing by in each valve passage, and connecting each valve independently to valve driving parts. CONSTITUTION:Two suction passages 9 and exhaust passages 10 are formed each to one cylinder, and a spherical suction valve 13 and a spherical exhaust valve 14 are rockably installed in each of these passages 9 and 10 with an orthogonal direction with the longgitudinal direction as the center. Each base shaft projectingly installed in one end of each of these suction and exhaust valves 13 and 14 as one body, and valve driving shaft pipes 19 and 20 are solidly attached to these base shafts. And suction and exhaust driven gears 21 and 22 are formed in these 19 and 20 as one body, while these gears 21 and 22 are engaged with suction and exhaust drive gears 36 and 37 solidly formed to cam followers 34 and 35 coming into contact with cams 31 and 32 and making them rock. These cams 31 and 32 are rotated and driven by rotation of a crankshaft via a drive gear 28 and both suction and exhaust valve cam gears 29 and 30.
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