Abstract: The invention relates to the field of hybrid generators for motor vehicle safety. The generator (101) comprises a cylindrical housing (2) closed by a closure ring (5) bearing an ignition device (8). An internal wall (12) bearing a central opening (14) and a hollow neck (16) in which is inserted a ring-shaped block (19) of solid ablatable fuel separates a reservoir chamber (17) containing pressurized air from a combustion and mixing chamber (18). Discharge holes (21) closed by breakable diaphragms (22) are arranged on the circumference of the combustion chamber (18). This generator has a very simple design and enables the inflating of cushions for protecting the occupants of motor vehicles.