摘要 |
The present invention relates to an actuator (4, 14) for a hood lifting arrangement, the actuator (4, 14) comprising a housing (5, 15) and a piston (6, 16) which is adapted to at least partly be positioned in the housing (5, 15) and comprising a piston head (7, 17) which has a cross-sectional area that exceeds the cross-sectional area of at least a part of the piston (6, 16) that follows the piston head (7, 17) in a direction (P, P) of the pistons displacement after activation of the actuator (4, 14). The piston head (7, 17) divides the housing (5, 15) in a first (8, 18) and second part (9, 19). The actuator (4, 14) further comprising a pyrotechnic charge (13, 26) arranged to provide an expanding gas pressure on the piston (6, 16) after activation. Then, the piston (6, 16) is displaced in said direction (P, P). During a first period of time (t1, t1) directly after activation, less gas is allowed to pass between the first part (8, 18) and the second part (9, 19) than during at least a first part of a following second period of time (t2, t2'). |
申请人 |
AUTOLIV DEVELOPMENT AB;GOETSTEN, HENRIK;AXELSSON, PETER;EDHOLM, JAKOB |
发明人 |
GOETSTEN, HENRIK;AXELSSON, PETER;EDHOLM, JAKOB |