Gas generator for restraining device

摘要

The present invention provides a gas generator for a restraining device, including:
a housing;an ignition device chamber housing and an outer cylindrical wall portion disposed inside the housing; andan annular partition wall portion forming a space near a top plate between the ignition device chamber housing and the outer cylindrical wall portion,a portion defined by the top plate and a bottom plate of the housing, the ignition device chamber housing and the outer cylindrical wall portion is a combustion chamber charged with a gas generating agent;an inner cylindrical wall portion, disposed on the housing bottom plate and spaced from the annular partition wall portion, is provided inside the combustion chamber;the ignition device chamber and the combustion chamber communicate with each other by a first communication portion;the combustion chamber and the space communicate with each other by a gas-flow hole of the annular partition wall portion;the first communication portion and the inner cylindrical wall portion face each other in the radial direction of the housing; anda combustion product generated in the ignition device chamber passes through the first communication portion, then collides with the inner cylindrical wall portion, changes a flow direction toward the top plate, and passes through the gas-flow hole of the annular partition wall portion.

主权项

1. A gas generator for a restraining device, comprising:
a housing including a top plate, a circumferential wall provided with a gas discharge port and a bottom plate; a tubular ignition device chamber housing being disposed inside the housing to form an ignition device chamber, that accommodates an ignition device, and having one end opening closed; an outer cylindrical wall portion being disposed such that a gas discharge path in communication with the gas discharge port is formed between the circumferential wall and the outer cylindrical wall portion; an annular partition wall portion having a gas-flow hole and being disposed between the ignition device chamber housing and the outer cylindrical wall portion to form a space with the top plate; a combustion chamber enclosed by the top plate, the bottom plate, the ignition device chamber housing, and the outer cylindrical wall portion and being charged with a gas generating agent therein; an inner cylindrical wall portion arranged on the bottom plate and spaced from the ignition device chamber housing and the outer cylindrical wall portion, and also at a distance from the annular partition wall portion; the ignition device chamber and the combustion chamber communicating with each other by a first communication portion formed by an opening provided in a circumferential wall portion of the ignition device chamber housing on the bottom plate side; the combustion chamber and the space formed by the annular partition wall portion communicating with each other by the gas-flow hole of the annular partition wall portion; the space formed by the annular partition wall portion and the gas discharge path which communicates with the gas discharge port, communicating with each other by a second communication portion formed by an opening provided between the outer cylindrical wall portion and the top plate; the first communication portion and the inner cylindrical wall portion facing each other in a radial direction of the housing; and a combustion product, which is generated in the ignition device chamber, passing through the first communication portion, then colliding with the inner cylindrical wall portion, changing a flow direction toward the top plate where the second communication portion is provided, and passing through the gas-flow hole of the annular partition wall portion.