Gas generator

A gas generator comprising:

• an elongated cylindrical housing containing a combustion chamber which a gas generating agent is arranged and a filter chamber in which a filter is arranged and having one end portion and another end portion in an axial direction closed;
• an igniter assembled to the one end portion of the housing, for burning the gas generating agent;
• a partition member axially dividing a space in the housing so as to form the combustion chamber at a position on a side of the one end portion of the housing and to form the filter chamber at a position on a side of the other end portion of the housing;
• and
• a sealed container accommodating the gas generating agent in a hermetically sealed state,
• wherein
• the housing having in a portion defining the filter chamber, a gas discharge opening for discharging, a gas to outside,
• the filter having a hollow portion extending along the axial direction of the housing and reaching an axial end surface located on a side of the combustion chamber,
• the sealed container being made of a member composed of a material lower in mechanical strength than the partition member such that at least a part of a portion of the sealed container opposed to the hollow portion of the filter bursts or melts with increase in pressure or temperature of the combustion chamber as a result of the burning of the gas generating agent,
• the partition member being made of a member composed of a material higher in mechanical strength than the sealed container such that at least a part of a portion of the partition member opposed to the hollow portion of the filter bursts with increase in pressure in the combustion chamber as a result of the burning of the gas generating agent to provide a communication hole which allows communication between the combustion chamber and the filter chamber,
• the sealed container is arranged such that an axial end portion located on a side of the filter chamber abuts on the axial end surface of the filter located on the side of the combustion chamber, and
• the partition member is arranged in the sealed container to abut on the axial end portion of the sealed container located on the side of the filter chamber.