프리텐셔너가 장착된 시트벨트 시스템의 관성잠김 안전버클 개발

To improve passenger safety, seatbelt systems with pre-tensioner that tightens seatbelt webbing using explosive just before collision are widely used these days. Even though seatbelt must not unlatched without passenger's operation, explosive power of pre-tensioner can cause unlocking of a buckle. To prevent the unlocking, an Anti-g mass that blocks displacement of the release button has been attached to the buckle. In this study, the dynamics and statics of locking mechanism associated with operation of Anti-g buckle has been theoretically investigated, and important design variables that affect the operation of Anti-g buckle have been identified. Through the total seatbelt system's dynamic simulation using force and displacement inputs obtained from seatbelt sled test, design of the proposed Anti-g buckle has been validated.