Drive unit for a belt pretensioner in a safety belt system for v

Details Drive unit for a belt pretensioner in a safety belt system for v Drive unit for a belt pretensioner in a safety belt system for v

1994-03-03

1995-09-19

Husar, Stephen F.

Power plants

One shot explosion actuated expansible chamber type motor

Having shock absorbing, damping or slow down means for...

280806, 297480, F02N 1300

Patent

active

054507235

ABSTRACT:
A belt pretensioner for vehicle safety belt systems is provided with a drive unit which comprises a pyrotechnic gas generator (12) and a piston and cylinder unit (16, 20). The piston (20) is arranged at a first end (161) of the cylinder (16) and is connected with a cable (22). By means of the gas pressure produced by the gas generator (12) the piston is accelerated towards the second, tapered end (162) of the cylinder (16). A sleeve-like insert (18) is arranged in the tapered cylinder end. The insert (18) has ribs and grooves alternating in the peripheral direction to offer sufficient room for plastic deformation.

REFERENCES:
patent: 4573322 (1986-03-01), Fohl
patent: 5145209 (1992-09-01), Lenzen

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