Tensioning device for use in belt retractor for safety belt in motor vehicle, has piston element slidably arranged in channel and comprising elastic sealing element connected with dimensionally stable spherical base body

摘要

The device (10) has a channel (16) connecting a gas generator (17) to a belt winding shaft (12), and a force transmission unit (19) movably arranged in the channel and for driving the shaft by actuation of the gas generator. A piston element (21) is slidably arranged in the channel, and has an elastic sealing element connected with a dimensionally stable spherical base body. The base body is made of metal, and is completely surrounded by the sealing element. The sealing element is made of a polymer material.