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    • 6. 发明专利
    • DE4304492A1
    • 1993-08-19
    • DE4304492
    • 1993-02-15
    • TAKATA CORP
    • HIRUTA MITSUHIKOYOSHIDA RYOICHINISHIZAWA MUNEOHIRAMATSU KOJIHAMAUE TETSUYA
    • B60R22/46
    • The pretensioner comprises a frame 2, a belt take-up shaft 1 rotatably mounted on the frame, and a rotary actuator 30 mounted on the frame and including a pressure chamber Q, a rotating member 31 and a gas generator 4 for supplying pressurized gas to the pressure chamber to impart rotation to the rotating member. A clutch 51, 52 is interposed between the rotating member and the take-up shaft and, in order to reduce the overall axial dimension of the pretensioner, is received in a space S within the chamber Q. The driving force of the rotating member is produced by gas pressure supplied to the pressure chamber via hole 30 to act on vane 312. Moreover, the gas pressure forces pawl or key 52 into engagement with ratchet wheel 51 to engage the clutch whereby the driving force is transmitted to the take-up shaft. Thus the take-up shaft rotates and tightens the belt. Many other designs and arrangements of the pawl and ratchet are disclosed as well as clutches of the friction type (Figs. 5 to 7) and ball-and-wedge type (Figs. 4A, 4B).