Abstract: The present invention provides an actuator including: a housing having an igniter housing and a cylinder, an igniter accommodated inside the igniter housing and a piston provided inside the cylinder to be slidable, the piston having a rod and an enlarged surface portion formed on one end surface or an outer peripheral surface of the rod, and part of the piston, which includes the other end of the rod, protruding outside the housing before activation, the igniter disposed such that the central axis direction of the igniter and the central axis direction of the rod of the piston are different from each other, wherein, during the activation of the igniter, the piston slides inside the cylinder by pushing the enlarged surface portion by a combustion product generated due to activation of the igniter, and the protruding portion of the piston is retracted inside the housing due to the sliding of the piston.

Abstract: A filter for a gas generator in which the manufacture is simple, which has an adequate filter performance and cooling performance and, furthermore, which has high reliability with little damage caused in actuation of the gas generator, is provided. The filter for an air bag gas generator comprises a first layer formed from helically wound wire rods having a cross-sectional area of 0.03 to 0.8 mm2, in such a way that the pitch angle of wire rods vertically superposed in the radial direction is symmetrical, and a second layer that exists on the outer side of the first layer in the radial direction and is formed to have a finer filter particle size than the first layer using a wire rod narrower than the wire rod that forms the first layer.

Abstract: The present invention provides a pyrotechnic actuator comprising a cylindrical housing, both ends of which are open, an electric ignition device disposed to block an opening portion at one end of the cylindrical housing, and a piston and piston rod inserted into the cylindrical housing to be capable of an axial motion, the cylindrical housing having in a peripheral surface thereof a gas discharge port, the gas discharge port being blocked by the piston prior to activation and opened by the motion of the piston after activation.

Abstract: A gas generator for an airbag producing no malfunction is provided. When the first combustion gas generated in the first combustion chamber 30 enters the filter chamber 50, most of the gas is discharged through the gas discharge port 52, however, part of the combustion gas flows into the second through hole 62. This combustion gas flows through the vent hole 76 into the second combustion chamber 40 after changes its flow direction by the gas-flow inhibiting member 80 inside the second cap member 75. At this time, the temperature of the gas is lowered, so that the second gas generating agent 43 is never burnt.

Abstract: The gas generator includes, a housing having a gas discharge port, a first combustion chamber defined by the housing, a first gas generating agent adapted to generate gas to inflate an air bag, the first gas generating agent having a first combustion temperature and disposed in the first combustion chamber, a second gas generating agent adapted to generate gas to inflate the air bag, the second gas generating agent having a second combustion temperature lower than the first combustion temperature and disposed in the first combustion chamber, and a first ignition unit for directly igniting at least one of the first gas generating agent and the second gas generating agent.

Abstract: The present invention provides a gas generator, relating to a gas generator for a side air bag or the like, in which the gas purification and cooling efficiency in a filter can be enhanced, the filter is not an obstacle in the release of the gas and the structure is simple. A gas generator for an airbag, in which an inner cylindrical member is stored in a housing, wherein the inner cylindrical member has a second outside diameter portion abutting against the inner peripheral surface of the housing, and a first outside diameter portion that is smaller in outside diameter than the second outside diameter portion, the tip end of the first outside diameter portion side abuts against the closed end portion (one end portion) of the housing, the filter is provided on the outside of the inner cylindrical member in the radial direction of the first outside diameter portion, and the ignition means is provided on the opposite end portion (the other end) from the closed end portion of the housing.

Abstract: The present invention provides a gas generator for an air bag capable of easily adjusting a volume ratio of two combustion chambers while reducing the gas generator in size. A diameter of an inner cylinder 15 disposed in a housing 11 is increased and reduced depending upon its vertical position. Thus, the volume ratio of the first combustion chamber 20 and the second combustion chamber 25 can be changed without changing the height of the housing 11 itself.

Abstract: The present invention provides a gas generator for an air bag in which an operating performance is excellent and an amount of NOx to be generated is reduced. The gas generator for an air bag comprises a housing having a gas discharging hole, an ignition means activated by an impact, and a combustion chamber accommodating a gas generating agent (its combustion temperature is 1000 to 3000° C.) which is ignited and burnt to generate a combustion gas, wherein the ignition means includes an igniter and a transfer charge, the transfer charge is a mixture of transfer charge powder (mixture powder of boron and niter) and gas generating agent molded article, and the gas generating agent molded article generates a gas of 1.2 moles/100 g or more.