Daicel Chemical Industries, Ltd.

Daicel Corporation

Fuji Filter Manufacturing Co., Ltd.

Masato Hirooka

Naoki Matsuda

Koji Yamamoto

Masayuki Yamazaki

Mikio Yabuta

Yoshiaki Nishikawa

Yasunori Iwai

Kenji Numoto

Kazuya Koyama

Naoki Daicel Chemical Industries Ltd Matsuda

A cylindrical filter for a pyrotechnic device, including a gas generating agent or pressurized gas as a gas generation source, includes a first annular end surface, a second annular end surface positioned opposite to the first annular end surface, and a cylindrical wall surface between the first annular end surface and the second annular end surface. At least one of the first and second annular end surfaces includes a weakened portion. The weakened portion, when provided in the first annular end surface, includes a first annular wall portion protruding from the first annular end surface and has a thickness less than a thickness of the first annular end surface. The weakened portion, when provided in the second annular end surface, includes a second annular wall portion protruding from the second annular end surface and has a thickness less than a thickness of the second annular end surface.

Cylindrical filter for pyrotechnic device, manufacturing method for cylindrical filter, and pyrotechnic device using cylindrical filter

A gas generator includes, a housing having a first container including a first bottom surface portion and a second container including a second bottom surface portion, the housing being formed by joining the first container and the second container, and an igniter attached to a mounting hole formed in the second bottom surface portion of the second container, the mounting hole including a passing region in the mounting hole, through which the igniter is passing, and a tip region around the passing region, the tip region being located, in a radial direction of the housing, outside an imaginary outer contour line when the igniter is projected onto the second bottom surface portion, in which paired edge portions intersect with each other to form a tip portion having a convex shape protruding outward in the radial direction of the housing on the outermost side of the region.

Gas generator

The present invention provides a retainer for retaining, from outside, a housing of a gas generator including a circumferential wall provided with no flange, the retainer including a combination of a first retainer and a second retainer,

Retainer and gas generator

The present invention provides a gas generator, including an outer shell housing having a top plate, a bottom plate and a circumferential wall provided with a gas discharge port, a combustion chamber accommodating a gas generating agent, a cylindrical filter and an ignition device disposed in a cup-shaped ignition device chamber housing, the bottom surface of the cup-shaped ignition device chamber housing facing the top plate and an end surface of the opening thereof abutting against the bottom plate, a length from an upper end surface to a lower end surface of the cylindrical filter being shorter than a distance from the top plate to the bottom plate of the outer shell housing, and the cylindrical filter being disposed such that the upper end surface faces the top plate and the lower end surface faces the combustion chamber, a cup-shaped cover member which has a bottom surface, a circumferential wall and an opening, further being disposed between the cup-shaped ignition device chamber housing and the cylindrical filter.

An apparatus including and igniter comprises:

Apparatus including igniter

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 mm, 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.

Filter for an air bag gas generator

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.

Gas generator for air bag

A gas generator for an air bag, includes: a housing having a gas discharging hole; an ignition unit activated upon an impact, the ignition unit including at least one igniter and at least one transfer charge, the transfer charge being a mixture of a transfer charge power and a gas generating agent molded article, and the gas generating agent molded article generates a gas of at least 1.2 moles/100 g; and a combustion chamber accommodating a gas generating agent which is ignited and burnt to generate a combustion gas.

The present invention relates to a pyrotechnic actuator, containing:

Pyrotechnic actuator

A dual-type gas generator for inflating air bags is provided in which a first igniter structure having a first combustion chamber accommodating a first gas generating material and a second igniter structure having a second combustion chamber accommodating a second gas generating material both exhaust, when activated, to exhaust gas to a common filter chamber. When the igniter structures are intended to be activated separately and with a time lag, gas generated in the first chamber often flows into the second chamber and may ignite the second gas generating material. This malfunction can be prevented by various flame-transferring preventing structures that preclude direct flow of gas from the first chamber into the second chamber through the common filter chamber.

Growing community of inventors

Tatsuno, Japan

Masato Hirooka