| 摘要 |
The nozzle cap (12) has a first part (13) fixed to the motor, and a relatively moveable second part (14) with larger diameter. A closed volume (15) is charged with a gaseous fluid to move the second part from storage to operational position. The closed volume is at least partially formed by a rolled diaphragm arrangement located between the moveable cap part and a stationary part of the propulsion unit (10) or the vehicle. The arrangement contains one diaphragm (16), which extends mainly rotary-symmetrical relative to the longitudinal axis of the propulsion unit and completely around the nozzle cap. A second diaphragm (17) forms an additional seal for the volume.
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