Gas generator

Patent metadata

Field	Value
Publication number	US-9896058-B2
Application number	US-201515509609-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Sep 29, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The present invention provides a gas generator including, an ignition device chamber, a gas inflow chamber, and a pressurized gas chamber being arranged from a first end fixed with an ignition device to a second end opposite thereto in a cylindrical housing, an inner circumferential wall surface of the cylindrical housing, from the ignition device chamber to the gas inflow chamber, having a first movement restricting portion, a second movement restricting portion and a stopping portion which are arranged in an axial direction at intervals in the above order so as to protrude, the second movement restricting portion having an ignition device chamber-side surface which is an inclined surface decreasing an inner diameter of the housing from the side of the ignition device chamber to the side of the gas inflow chamber and a gas inflow chamber-side surface whose angle (α1) with respect to the cylindrical housing is not more than 90 degrees, so that an axial cross-sectional shape of the second movement restricting portion is a triangle, a breaking device being arranged between the ignition device chamber and the gas inflow chamber and including a base whose outer circumferential surface abuts against an inner circumferential wall surface of the cylindrical housing and a distal end having an enlarged-diameter portion, and before actuation, the base being held between the first movement restricting portion and the second movement restricting portion, after actuation, the base being held between the surface of the second movement restricting portion whose angle α1 is not more than 90 degrees and the stopping portion.

First claim

The invention claimed is:

1. A gas generator comprising,
a cylindrical housing having a first end whose opening is fixed with an ignition device, and a closed second end on an axially opposite side of the first end, the cylindrical housing including an ignition device chamber provided with the ignition device, a gas inflow chamber having a gas discharge port, and a pressurized gas chamber,
the ignition device chamber, the gas inflow chamber and the pressurized gas chamber being arranged in the cylindrical housing, in the above order from the first end,
an inner circumferential wall surface of the cylindrical housing from the ignition device chamber to the gas inflow chamber, having a first movement restricting portion, a second movement restricting portion and a stopping portion which are arranged in an axial direction at intervals in the above order so as to protrude,
the second movement restricting portion having an ignition device chamber-side surface which is an inclined surface decreasing an inner diameter of the housing from the side of the ignition device chamber to the side of the gas inflow chamber and a gas inflow chamber-side surface whose angle (α 1 ) with respect to the cylindrical housing is not more than 90 degrees, so that an axial cross-sectional shape of the second movement restricting portion is a triangle,
a closing means closing between the pressurized gas chamber and the gas inflow chamber, the closing means including,
a fixing portion extended radially inward from the inner circumferential wall surface of the cylindrical housing and
a rupturable plate fixed to the fixing portion, and

a breaking device for the rupturable plate being arranged between the ignition device chamber and the gas inflow chamber, the breaking device including,
a base whose outer circumferential surface abuts against the inner circumferential wall surface of the cylindrical housing and
a rod which extends from the base towards the rupturable plate, the rod including a rod main body portion which extends from the base, and an enlarged-diameter portion which has a diameter enlarged radially at a distal end portion of the rod main body portion,

before actuation, the base of the breaking device being held between the first movement restricting portion and the second movement restricting portion to fix the breaking device,
after actuation, the base of the breaking device being held between the gas inflow chamber-side surface of the second movement restricting portion whose angle α 1 is not more than 90 degrees and the stopping portion to stop movement of the breaking device towards both sides in the axial direction.

2. The gas generator according to claim 1 , wherein the angle α 1 ranges from 45 to 90 degrees.

3. The gas generator according to claim 1 , wherein
the base and the rod are integrated in the breaking device, and
the base includes a disk portion having a through hole in a thickness direction thereof, and an outer circumferential surface of the disk portion abuts against the inner circumferential wall surface of the cylindrical housing so as to slide in the axial direction.

4. The gas generator according to claim 1 , wherein
the base and the rod are integrated in the breaking device, and
the base includes a disk portion having a through hole in a thickness direction thereof, and a cylindrical wall surface portion extending from an outer circumference of the disk portion towards the ignition device, and an outer circumferential surface of the cylindrical wall surface portion abuts against the inner circumferential wall surface of the cylindrical housing so as to slide in the axial direction.

Assignees

• Daicel Corp

Inventors

• Kobayashi Tomoharu
• Hanano Teppei

Classifications

• B60R21/274 Primary

  characterised by means to rupture or open the fluid source · CPC title

• B60R21/272 Primary

  with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators · CPC title

• B60R2021/2642

  comprising a plurality of combustion chambers or sub-chambers · CPC title

• B60R2021/26029

  Ignitors · CPC title