A gas generator includes, a housing provided with a gas discharge port, an ignition chamber, accommodating an igniter and a transfer charge, provided on an end portion of the housing, a combustion chamber disposed within the housing and accommodating a gas generating agent, a rupturable closing member partitioning the combustion chamber from the ignition chamber and including a rupturable portion ruptured upon an actuation of the gas generator, and an inner tube extending from the closing member toward the gas discharge port inside the combustion chamber. The inner tube defines outside thereof a space containing the gas generating agent, and defines inside a hollow space. The inner tube is provided with a plurality of through holes. The inner tube includes one end communicating the hollow space with the ignition chamber to transfer the transfer charge in a burning state toward an opposite end when the rupturable portion is ruptured.

A gas generating composition for a safety device in a vehicle comprises an oxidant which comprises a basic mixed metal nitrate, wherein the basic mixed metal nitrate is based on a basic metal nitrate in which the metal of the basic metal nitrate is partly replaced with at least one further element.

The disclosure further states the use of such gas generating composition and of such basic mixed metal nitrate.

A gas generating composition for a safety device in a vehicle comprises an oxidant which comprises a basic mixed metal nitrate, wherein the basic mixed metal nitrate is based on a basic metal nitrate in which the metal of the basic metal nitrate is partly replaced with at least one further element.

The disclosure further states the use of such gas generating composition and of such basic mixed metal nitrate.

The present invention provides a gas generator, including: a housing with a gas discharge port; an igniter assembly and a gas generating agent in the housing; and a metallic cup of constant inner diameter covering the igniter to define a charging chamber. The igniter assembly includes a main body, including an ignition portion and a electro-conductive pin integrated with a metallic collar by a resin. The metallic collar has a fixing portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting inward from the bottom surface of the housing, and a guide portion. An inner circumferential wall surface of the metallic cup and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall of the metallic cup member and an outer circumferential wall surface of the guide portion.

The present invention provides a gas generator, including: a housing with a gas discharge port; an igniter assembly and a gas generating agent in the housing; and a metallic cup of constant inner diameter covering the igniter to define a charging chamber. The igniter assembly includes a main body, including an ignition portion and a electro-conductive pin integrated with a metallic collar by a resin. The metallic collar has a fixing portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting inward from the bottom surface of the housing, and a guide portion. An inner circumferential wall surface of the metallic cup and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall of the metallic cup member and an outer circumferential wall surface of the guide portion.

An additively manufactured solid fuel grain for a hybrid rocket engine having a cylindrical shape, defining a center combustion port and comprising a stack of fused layers of polymeric material suitable for hybrid rocket fuel. Each layer is formed as a plurality of fused abutting concentric beads of solidified material arrayed around the center port. An oxidizer is introduced into the solid fuel grain through the center port, with combustion occurring along the exposed surface area of the solid fuel grain center port wall. Each concentric bead possesses a surface pattern that increases the combustion surface area and when stacked forms a rifling pattern of undulations that induces oxidizer-fuel gas axial flow to improve combustion efficiency. The port wall surface pattern persists during the rocket engine's operation as the fuel phase changes from solid to gas and is ablated.

A gas generator for an airbag includes a first gas reserve with a first orifice, a first mechanism arranged for opening the first gas reserve, and a diffusion chamber arranged for diffusing the discharge gases. The generator additionally includes a mixing chamber comprising at least one first communication surface with the diffusion chamber. The gas generator further including a second mechanism comprising a second actuator and a mobile obturator between a first obstruction position, in which it obstructs a second communication surface with a diffusion chamber and a second passage position, in which the second communication surface is free.

A gas generator for an airbag includes a first gas reserve with a first orifice, a first mechanism arranged for opening the first gas reserve, and a diffusion chamber arranged for diffusing the discharge gases. The generator additionally includes a mixing chamber comprising at least one first communication surface with the diffusion chamber. The gas generator further including a second mechanism comprising a second actuator and a mobile obturator between a first obstruction position, in which it obstructs a second communication surface with a diffusion chamber and a second passage position, in which the second communication surface is free.

The present invention provides a gas generator, including: a cylindrical housing attached with an ignition device at one end and a diffuser portion, which has a gas discharge port, at the other end; and a combustion chamber charged with a molded article of a gas generating agent in the remaining space inside the cylindrical housing, the combustion chamber provided with a plurality of grooves serving as a gas discharge path, the plurality of the grooves serving as a gas discharge path being formed plurally and continuously in a longitudinal direction of the cylindrical housing and arranged in a circumferential direction of the cylindrical housing, a size of the grooves in the lateral direction being adjusted to be less than a minimum length of the molded article of the gas generating agent, and combustion gas, which is generated by combustion of the molded article of the gas generating agent at a time of actuation, flowing along the grooves serving as a gas discharge path and being discharged from the gas discharge port of the diffuser portion.

A device is disclosed for controlling a rate of gas pressure increase generated by a propellant for propelling a projectile from an upstream towards a downstream end of a gun barrel. The device includes a first surface area defined by the propellant and a deterrent applied to a second surface area defined by the first surface area, the second surface area being less than the first surface area. The arrangement is such that the second surface area defines a deterrent free third surface area of the propellant. A primer is operatively disposed relative to the third surface area such that when the primer is activated, the third surface area of the propellant is ignited. The arrangement is such that firstly, while the third surface area is burning and generating gas between the upstream end of the gun barrel and the projectile, the rate of gas pressure increase begins to propel the projectile towards the downstream end of the gun barrel. Secondly, the third surface area of the propellant while burning exposes a progressively increasing surface area of the propellant for burning together with an associated increased generation of gas, the increasing surface area of the propellant defining a concave crater, the crater having a wall which progressively increases in surface area during the burning such that the rate of increase in gas pressure continues to increase for accelerating the projectile towards the downstream end of the gun barrel.