Linear drive
AssigneeTRW Automotive GmbH
InventorsSimon Schreiber, Hermann Grau, Krzysztof Krukowski
Life of this patent
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Abstract
A linear drive, especially for a belt tensioner, includes a housing (10) including a piston seat (12), a piston element (16) accommodated in the piston seat (12) and a pyrotechnical drive element adapted to supply gas for displacing the piston element (16). The inner wall of the piston seat (12) includes a groove (30) extending in the displacing direction (R) of the piston element (16) through which gas can flow off the piston seat (12).
Claims8
1-10. (canceled)
A linear drive, especially for a belt tensioner, comprising a housing (10) including a piston seat (12), a piston element (16) connected to a gear rack (22) being movably accommodated in the piston seat (12) and a pyrotechnical drive element adapted to supply gas for displacing the piston element (16),
- wherein the inner wall of the piston seat (12) includes a groove (13) extending in the displacing direction (R) of the piston element (16) through which gas can flow off the piston seat (12),
- and the groove (30) being configured so as to allow a gas flow into the housing (10) ahead of the piston element (16) viewed in the displacing direction (R),
- and wherein the length of the groove ranges from 35 mm to 70 mm.
Dependencies are inferred from the claim text.