AIR BAG APPARATUS

• US 20130334800A1
• Filed: 06/12/2013
• Published: 12/19/2013
• Est. Priority Date: 06/13/2012
• Status: Active Grant

• Current Assignee: Daicel Corporation
• Original Assignee: Daicel Corporation
• Inventors: YAMAZAKI, Masayuki, UEDA, Masayuki
• Granted Patent: US 8,876,158 B2
• Time in Patent Office: Days
• US Class Current: 280/736
• CPC Class Codes: B60R 2021/2612 Gas guiding means, e.g. ducts
• CPC Class Codes: B60R 21/217 Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid
• CPC Class Codes: B60R 21/263 using a variable source, e.g. plural stage or controlled output hybrid inflators B60R21/272

Abstract

The present invention provides an air bag apparatus including:

• • a base plate, two gas generators, a cover member covering the two gas generators so as to form a gap, an air bag accommodated in contact with the base plate,
  • a hollow formed in the base plate and provided with a communication hole, the hollow accommodating the two gas generators such that a space is provided between two gas generators and another gap, for communicating with the communication hole, is formed,
  • the air bag accommodated such that a gas inlet thereof enclose the communication hole from the other side of the base plate,
  • the air bag, the base plate and the cover member being integrally fixed, and
  • a sealed gas discharge path formed by the cover member and the base member, and leading from the gas discharge port of the two gas generators to the gas inlet of the air bag.

Claims

1. An air bag apparatus comprising:

a base plate, two gas generators, a first gas generator and a second gas generator, fixed to one side of the base plate;

a cover member covering the two gas generators from the same side as the one side of the base plate;

an air bag accommodated in contact with the base plate;

a hollow formed in the one side of the base plate and provided with a communication hole,

the two gas generators being arranged in the hollow with a space therebetween, such that a gap, for communicating with the communication hole, is formed between the hollow and a gas discharge port of the respective gas generators,

the cover member covering the two gas generators such as to form a gap between the cover member and the gas discharge port of the respective gas generators,

the air bag accommodated such that a gas inlet thereof encloses the communication hole in the hollow from the other side of the base plate,

the air bag, the base plate and the cover member being integrally fixed by fastening, with a fastening member, the base plate, the cover member and a frame shaped air bag attachment member which is arranged to abut against the gas inlet in an inside of the airbag,

the two gas generators being fixed by the hollow of the base plate and the cover member, and

a sealed gas discharge path formed by the cover member and the base plate, and leading from each gas discharge port of the two gas generators to the gas inlet of the air bag.

2. The air bag apparatus according to claim 1, wherein

each of the two gas generators has a columnar outer shape and a plurality of gas discharge ports in an annular region on a circumferential surface near one end surface, and the circumferential surface in the annular region provided with the gas discharge ports has a smaller outer diameter than that of circumferential surfaces of the remaining portion,

the two gas generators are disposed in the hollow of the base plate with the space therebetween, such that the end surfaces, on the side where the plurality of gas discharge ports are provided, face each other,

the base plate, the two gas generators, and the cover member are disposed such that an annular gap is formed between the circumferential surface of the annular region provided with the gas discharge ports and an inner surface of the cover member, and between the circumferential surface of the annular region provided with the gas discharge ports and a surface of the hollow of the base plate, and

the annular gap communicates with the communication hole formed in the hollow of the base plate, thereby forming the gas discharge path.

3. The air bag apparatus according to claim 2, wherein

the space between the end surfaces of the two gas generators has a distance of 0.1 to 2 times an outer diameter of the gas generators.

4. The air bag apparatus according to claim 1, comprising

at least one of a protrusion protruding in the hollow of the base plate and a protrusion protruding from the inner surface of the cover member,

the protrusion being positioned in the space between the two gas generators and abutted against the two gas generators.

5. The air bag apparatus according to claim 2, comprising:

at least one of a protrusion protruding in the hollow of the base plate and a protrusion protruding from the inner surface of the cover member,

the protrusion being wider in a bottom side than in a top side thereof,

the protrusion being positioned in the space between the two gas generators and abutted against the two gas generators, and

the annular regions of the two gas generators, or the annular gaps thereof being communicated with each other.

7. The air bag apparatus according to claim 3, comprising:

at least one of a protrusion protruding in the hollow of the base plate and a protrusion protruding from the inner surface of the cover member,

the protrusion being wider in a bottom side than in a top side thereof,

the protrusion being positioned in the space between the two gas generators and abutted against the two gas generators, and

the annular regions of the two gas generators, or the annular gaps thereof being communicated with each other.

6. An air bag apparatus comprising:

a base plate having an opening;

two gas generators;

a cover member covering the two gas generators;

an air bag accommodated in contact with the base plate;

a retainer for retaining the air bag and a gas generator,

the retainer including a flat plate portion and a hollow formed in one side of the flat plate portion, the hollow provided with a plurality of communication holes,

the two gas generators being arranged, with a space therebetween, inside the opening of the base plate and in the hollow of the retainer, and having a gap for communicating with a communication hole between the hollow and a gas discharge port of the respective gas generators,

the cover member covering the two gas generators such as to form a gap between the cover member and the gas discharge port of the respective gas generators,

as to the air bag, the retainer, the base plate and the cover member,

the retainer being inserted into the air bag from an gas inlet of the air bag, and disposed such that the flat plate portion abuts against the gas inlet in an inside of the airbag,

the retainer, the air bag, the base plate and the cover member being integrally fixed by a fastening member,

the two gas generators being fixed by the hollow of the retainer, the opening of the base plate and the cover member,

a sealed gas discharge path formed by the cover member, the base plate and the retainer, and leading from the gas discharge port of a plurality of gas generators to the gas inlet of the air bag.