| 摘要 |
<p>The belt pretensioner drive (30) has an electric motor (3), a spindle shaft (4) and a driven gear (21) coupled with a winding shaft (1). A worm gear (20) is provided, over which the driven gear is driven by the spindle shaft. A helical cut external toothing (22) of the driven gear cogs with a torque-proof screw (24) for forming the worm gear. The screw is mounted on the spindle shaft. The external toothing of the driven gear has two tooth sections (22a,22b). The former tooth section has a tooth with a constant geometry. The latter tooth section is formed with increasing root circle diameter or increasing head circle diameter or increasing tooth thickness.</p> |
