| 摘要 |
PROBLEM TO BE SOLVED: To provide a webbing winding device capable of efficiently moving a moving member by gas pressure and lowering gas pressure in a cylinder after the end of movement of a pretensioner.SOLUTION: A webbing winding device 10 is configured such that the sealing performance of a cylinder 38 by a first piston 50 is higher than that of the cylinder 38 by a second piston 56 provided closer to the axial base end side of the cylinder 38 than the first piston 50. Thus, a first moving member 52 can be efficiently moved by gas pressure until the first piston 50 is moved to a vehicle rear side behind the opening 74 of the cylinder 38. After the first piston 50 is moved to the vehicle rear side behind the opening 74 of the cylinder 38, gas pressure in the cylinder 38 can be lowered by discharging gas from the opening 74 side of the cylinder 38.SELECTED DRAWING: Figure 2 |
