| 摘要 |
<p>Rotary driving unit for a belt tensioner in a safety belt system. The belt is inserted over a driving reel (1) with a gripping surface (2) which is rotatively pressed against the belt (3) when the system is activated. When the length of belt to be inserted equals 180 mm, the outer diameter of a single-stage rotary piston cylinder used as driving reel equals 70 mm, or if a double-stage rotary piston cylinder is used, a diameter of only 40 mm is required. An alternative drive of the driving reel consists of a cable driven by a pyrotechnic linear cylinder. This kind of belt tensioning does not interfere with the mechanism of the retractors, works independently from the retractors, is easily combined with a belt clamp which works only in case of an accident, is very compact and economic, thanks to its simple mechanical design comprising few parts only. In a very economic construction with only a few additional parts the belt tensioner can also be used after being activated as belt retainer, so that the same element, after tensioning the belt, also takes up the load resulting from an accident.</p> |
