An initiator for a gas generator of a vehicle safety device includes a cup defining an interior, a primary pyrotechnic material disposed in the interior of the cup, and a secondary pyrotechnic material disposed in the interior of the cup. A separator member hermetically separates the primary pyrotechnic material from the secondary pyrotechnic material.

Provided are a gas generant composition, a preparation method, and a gas generator containing the composition. The gas generant composition includes components having the following contents, in percent by mass: 40% to 60% of guanidine nitrate, 25% to 50% of basic copper nitrate, 0% to 7% of ammonium perchlorate, 1% to 10% of a slag-forming agent, and 0.05% to 5% of a release agent/lubricant, the slag-forming agent is used as a form-retaining agent, so that the tablets can retain their form before combustion very well after combustion, thereby completely avoiding burning of an inflatable bag due to melting and splashing of the combusted tablets. Moreover, ammonium perchlorate is used as auxiliary oxidizers, thereby reducing the amount of basic cupric nitrate used and reducing molten copper residues. The gas generant composition is mainly used in a gas generator for vehicle airbag.

A gas generator including an igniter, a combustion chamber, and a restriction part, the igniter including an accommodating chamber accommodating an explosive therein, an ignition portion provided in the accommodating chamber, and a separating part including a pressure receiving surface, the separating part being configured to be separable from the igniter and movable in a predetermined direction, the combustion chamber being configured to burn a gas generating agent filled outside the accommodating chamber, by the combustion of the explosive, the restriction part provided in a predetermined position in the predetermined direction from the igniter and restricting a movement of the separating part, and the separating part including a guide that directs the combustion product of the explosive by the pressure receiving surface toward the igniter, in a state where the movement of the separating part in the predetermined direction is restricted by the restriction part.

A tablet, a gas generator and a gas generating device are provided, wherein the tablet comprise a tablet body, the tablet body comprises opposite first and second sides, the tablet body is provided with a vent hole running from the first side to the second side, the first side is provided with a first positioning structure, and the second side is provided with a second positioning structure that cooperates with the first positioning structure. By the smart design of the tablet structure, the present disclosure can effectively simplify the structure of the gas generator and reduce the manufacturing cost.

The invention relates to a propellant element for a gas generator for use in a safety device in the form of a coated pellet (24), wherein the coated pellet (24) comprises a core (20) made of a first pyrotechnical material (46) and a coating (22) made of a second pyrotechnical material (48) and enveloping the core (20), wherein the first pyrotechnical material (48) differs from the second pyrotechnical material (48) and wherein the core (20) includes an edge portion (26) projecting in the radial direction which extends through the coating (22) up to an outer contour (28) of the coated pellet (24), wherein the edge portion (26) is formed along a circumferential direction of the coated pellet (24) and has a smaller expansion than the core (20) in the axial direction of the coated pellet (24).

The disclosure relates to a gas generator for a vehicle safety system, comprising an ignition unit, a propellant configured in a combustion chamber in a form of a propellant bed extending along a longitudinal axis of the gas generator. A sleeve having an axial opening protrudes into the propellant bed such that it surrounds the ignition unit at least partially and portions of the propellant are stored inside and outside the sleeve.

An inflator for generating inflation gases for a safety device includes a housing having an internal cavity including a combustion chamber and a filter chamber. A filter is disposed in the filter chamber. A separating member is disposed in the housing on a first axial side of the filter and separates the filter chamber from the combustion chamber. An insulating member is disposed in the filter chamber on a second axial side of the filter. The second axial side is opposite the first axial side. The separating member is coupled to the insulating member.

A dual stage inflator a dual stage inflator for an inflatable vehicle safety device includes a housing defining a first chamber containing a first gas generant material. An ignitor cup is disposed in the first chamber and defines an interior containing an ignitor material. A first ignitor device extends into the interior of the ignitor cup. A combustion cup and a lid are disposed in the first chamber and cooperate to define a second chamber containing a second gas generant material. The combustion cup includes a cup sidewall extending between a first axial end and a second axial end. The first axial end is an open end. The lid is normally in a closed position relative to the combustion cup to close the open end of the combustion cup and is moveable away from the combustion cup in response to an increase of pressure within the combustion cup for venting combustion gas out of the combustion cup. A second ignitor device extends into the combustion cup and closes the second axial end of the combustion cup. The combustion cup includes a first axially extending portion adjacent the first axial end having a first outer diameter and a second axially extending portion adjacent the second axial end having a second outer diameter greater than the first outer diameter. The lid includes a lid sidewall extending in an axial direction and radially overlapping at least a portion of the combustion cup including the first outer diameter.

A gas generator for use for a safety device in vehicles comprises a pyrotechnical propelling charge, wherein the propelling charge is formed from a first and at least a second master batch which are in a mixed state in a filling. Each master batch has a plurality of molded propellant bodies having defined geometry and having a relative quickness. The relative quickness RQ2 of the second master batch is less than the relative quickness RQ1 of the first master batch, wherein RQ2=RQ1.Math.fq and fq≤0.9. The invention further relates to a method for producing the propelling charge.

A gas generator in which, between an ignition device and an inner cylindrical member, on a side of the lid wall portion, a transfer charge chamber is formed, and on a side of another end portion of a peripheral wall portion, a flow space is formed, the flow space being a space configured to allow combustion gas to flow in from the transfer charge chamber when an igniter is actuated, and being a space configured to allow the combustion gas to flow out to the outside of the inner cylindrical member when the igniter is actuated, and a total cross-sectional area of an inflow path serving a flow path through which the combustion gas flows from the transfer charge chamber into the flow space is configured to be smaller than a cross-sectional area of the flow space.