HOW DOES A SEAT BELT PRETENSIONER WORK?
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A modern seat belt does more than just restrain you—it can tighten rapidly during a crash.
🔹 Retractor & Spool — Stores the belt
🔹 Pretensioner — Removes belt slack during a crash
🔹 Pawl & Ratchet — Locks the belt
🔹 Load Limiter — Helps control belt force on the occupant
💥 Crash detected → ECU triggers pretensioner → Gas generates force → Belt tightens → Spool locks
⚠️ Pretensioners are safety-critical pyrotechnic devices. Never attempt to test or disassemble one without the proper service procedure.
💬 Did you know your seat belt had this much technology inside?
#SeatBelt #CarSafety #Automotive #SafetySystems #Mechanics
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