| 摘要 |
This V-type engine has first and second banks of cylinders, each odd in number, with first intake and exhaust cam shafts provided along the first cylinder head and second intake and exhaust cam shafts provided along the second cylinder head. One of the first intake and exhaust cam shafts, and one of the second intake and exhaust cam shafts, is rotationally driven from the crank shaft. A first intake cam shaft gear wheel is provided on the first intake cam shaft at a longitudinal position between the middle cylinder of the first bank of cylinders and the next cylinder to the rear from the middle cylinder, and a first exhaust cam shaft gear wheel, meshed with this first intake cam shaft gear wheel, is provided on the first exhaust cam shaft at a similar longitudinal position between the middle cylinder of the first bank of cylinders and the next cylinder to the rear therefrom. A second intake cam shaft gear wheel is provided on the second intake cam shaft at a longitudinal position between the middle cylinder of the second bank of cylinders and the next cylinder to the front from the middle cylinder, and a second exhaust cam shaft gear wheel, meshed with this second intake cam shaft gear wheel, is provided on the second exhaust cam shaft at a similar longitudinal position between the middle cylinder of the second bank of cylinders and the next cylinder to the front therefrom. Thereby, the bulges corresponding to these meshed pairs of gear wheels are brought as close together as practicable.
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