| 摘要 |
PROBLEM TO BE SOLVED: To prevent a portion of a joint part adjacent to an opening from being impaired with a stress that is applied along with opening of a pressure regulation valve.SOLUTION: An inflatable part of an airbag 40 is segmented into an upstream inflatable part 47 and downstream inflatable part 48 using a segmentation member 50. A part of the segmentation member 50 is made as a pair of superposition parts 61 that are superposed on each other in a belt-like manner in the upstream inflatable part 47, and both of the superposition parts 61 are joined by a joint part 64 on the boundary portion with a non-superposition part 63. The segmentation member 50 is provided with a pressure regulation valve 70 that includes: an opening 71, which is formed by dissolving the joint of the superposition parts 61 by the joint part 64; and a pair of valve body parts 72 and 73 that sandwich the opening 71. Further, the superposition parts 61 is provided with a stress alleviation part 66 that alleviates a stress to be applied to a portion of the joint part 64 adjacent to the opening 71 along with opening of the pressure regulation valve 70. |
