| 摘要 |
<p>Drive systems equipped with a combustion engine, as used in small vehicles and in tools, emit unpleasantly high levels of noxious substances and noise. According to the invention, noise emission is reduced by an expansion chamber in the exhaust system, which is connected to the combustion chamber via the valves during the expulsion of the exhaust gases and to the atmosphere for at least part of the remaining time. In addition, a small vehicle is described which is fitted with such a drive system which can be taken everywhere with it. For this purpose, the small vehicle is collapsible, its frame comprising a front section and a rear section, which can be folded together through a hinge in a swivelling axis parallel to the small wheels. The swivelling lever can likewise be pivoted and aligned with a swivelling axis parallel to the small wheels on the front section of the frame.</p> |
