CYLINDRICAL FILTER FOR GAS GENERATOR

• US 20110300030A1
• Filed: 05/27/2011
• Published: 12/08/2011
• Est. Priority Date: 06/08/2010
• Status: Active Grant

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: HATOMOTO, Atsushi
• Granted Patent: US 8,672,350 B2
• Time in Patent Office: Days
• US Class Current: 422/187
• CPC Class Codes: B01D 2275/105 Wound layers
• CPC Class Codes: B01D 2279/10 for air bags, e.g. inflators therefor
• CPC Class Codes: B01D 39/12 of wire gauze; of knitted wire; of expanded metal
• CPC Class Codes: B01D 46/2403 characterised by the physical shape or structure of the filtering element
• CPC Class Codes: B01D 46/528 using wound sheets B01D46/527 takes precedence
• CPC Class Codes: B60R 2021/26011 using a filter through which the inflation gas passes
• CPC Class Codes: Y10T 29/49604 Filter

Abstract

The present invention provides a cylindrical filter for a gas generator, including:

• • a plurality of layers made of a porous metal plate in which a compressive strength (S1) of a predetermined region in at least one end in the height direction is set smaller than a compressive strength (S2) of a portion other than the S1 region,
  • the porous metal plate being selected from the group consisting of expanded metal, metal lath, and perforated metal, and
    the S1 region corresponding to a region of 5 to 20% in length from both ends with respect to the overall height.

Claims

1. A cylindrical filter for a gas generator, comprising:

a plurality of layers made of a porous metal plate in which a compressive strength (S1) of a predetermined region in at least one end in the height direction is set smaller than a compressive strength (S2) of a portion other than the S1 region,

the porous metal plate being selected from the group consisting of expanded metal, metal lath, and perforated metal, and

the S1 region corresponding to a region of 5 to 20% in length from both ends with respect to the overall height.

2. The cylindrical filter for a gas generator according to claim 1, wherein a difference between S1 and S2 is a difference due to an opening area of holes per unit area in the region S1 being set greater than an opening area of holes per unit area in the S2 region.

3. The cylindrical filter for a gas generator according to claim 1, wherein

a difference between S1 and S2 is a difference due to;

an opening area of holes per unit area in the S1 region being set greater than an opening area of holes per unit area in the S2 region, and

a thickness in the range of S1 being set smaller than a thickness in the range of S2.

4. The cylindrical filter for a gas generator according to claim 1, wherein a difference between S1 and S2 is a difference due to a thickness in the region of S1 being set smaller than a thickness in the S2 region.

5. The cylindrical filter for a gas generator according to claim 1, wherein the porous metal plate is rolled plural times so as to form a cylindrical shape and a rolling end is welded and fixed.

6. A gas generator, comprising a housing, a solid gas generating agent as a gas source and the cylindrical filter according to claim 1, disposed in the housing, wherein

the both ends of the cylindrical filter in the height direction are in press-contact with an inner wall surface of the housing and the filter is fixed to the housing by squashing the S1 region of the cylindrical filter in the axial direction, and

a member for preventing leakage of combustion gas from a press-contact portion of the cylindrical filter and the housing is not disposed at the press-contact portion.