Gas generator

Patent metadata

Field	Value
Publication number	US-2018043854-A1
Application number	US-201615559732-A
Country	US
Kind code	A1
Filing date	Apr 5, 2016
Priority date	Apr 24, 2015
Publication date	Feb 15, 2018
Grant date	—

Abstract

The present invention provides a gas generator including, in a cylindrical housing, a gas generation chamber accommodating a gas generating agent and an ignition device, the ignition device being disposed at a first end surface of the cylindrical housing, and a second end surface, which is axially opposite to the first end surface, being closed by a closing member, the closing member having a fragile portion formed such that a part thereof is ruptured when the first surface on the side of the gas generation chamber receives a pressure of a gas including a combustion gas, and the ruptured portion is bent and opened to the axially opposite side of the first surface, a gas discharge port for the combustion gas being formed by the ruptured portion which is bent and opened from a surface of a non-ruptured portion after the part of the closing member is ruptured along the fragile portion, a control device restricting an angle between the second surface of the closing member and the bent ruptured portion to be 5 degrees to 85 degrees, the control device being a member which is adjusted to have such a distance that the bent ruptured portion is in contact therewith, or a support portion which is formed to protrude from the second surface of the closing member at a position such as to be in contact with the ruptured portion.

First claim

1 . A gas generator comprising, in a cylindrical housing, a gas generation chamber accommodating a gas generating agent as a gas generating source and an ignition device,
the ignition device being disposed at a first end surface of the cylindrical housing, and a second end surface, which is axially opposite to the first end surface of the cylindrical housing, being closed by a closing member, the closing member having a first surface on the side of the gas generation chamber and a second surface on the back side of the first surface, the closing member having a fragile portion formed such that a part thereof is ruptured when the first surface receives a pressure of a gas including a combustion gas, and the ruptured portion is bent and opened to an axially opposite side of the first surface, a gas discharge port for the combustion gas being formed by the ruptured portion which is bent and opened from a surface of a non-ruptured portion after the part of the closing member is ruptured along the fragile portion, a control device restricting an angle between the second surface of the closing member and the bent ruptured portion to be 5 degrees to 85 degrees, the control device being,
a member which is adjusted to have such a distance that the bent ruptured portion of the closing member is in contact therewith, or
a support portion which is formed to protrude from the second surface of the closing member at a position such as to be in contact with the bent ruptured portion.

2 . A gas generator comprising, in a cylindrical housing, a gas generation chamber accommodating a gas generating agent as a gas generating source, and a diffuser portion provided with a gas discharge port,
a closing member closing between the gas generation chamber and the diffuser portion, the closing member having a first surface on the side of the gas generation chamber and a second surface on the back side of the first surface, the closing member having a fragile portion formed such that a part thereof is ruptured when the first surface receives a gas pressure from the gas generating source, and the ruptured portion is bent and opened toward the diffuser portion, a gas discharge path leading to a gas discharge port being opened by the ruptured portion which is bent and opened from a surface of a non-ruptured portion after the part of the closing member is ruptured along the fragile portion, a control device restricting an angle between the second surface of the closing member and the bent ruptured portion to be 5 degrees to 85 degrees, the control device being,
a wall surface of the diffuser portion which is adjusted to have such a distance that the bent ruptured portion of the closing member is in contact therewith, or
a support portion which is formed to protrude from the second surface of the closing member at a position such as to be in contact with the bent ruptured portion.

3 . The gas generator according to claim 2 , wherein the gas generation chamber is a combustion chamber accommodating the gas generating agent and the ignition device,
the part of a closing member is ruptured and opened when the first surface receives the gas pressure of a combustion gas generated in the combustion chamber, so that a combustion gas discharge path leading to the gas discharge port is opened.

4 . A gas generator comprising, in a cylindrical housing, a gas generation chamber and a diffuser portion provided with a gas discharge port,
the gas generation chamber being a combination of a combustion chamber accommodating a gas generating agent and an ignition device, and a pressurized gas chamber filled with a gas, the combustion chamber being arranged on the side of a first end surface of the cylindrical housing, the diffuser portion which is provided with the gas discharge port being arranged on the side of a second end surface which is axially opposite to the first end surface of the cylindrical housing, and the pressurized gas chamber being arranged between the combustion chamber and the diffuser portion, a first closing member closing between the combustion chamber and the pressurized gas chamber, and a second closing member closing between the pressurized gas chamber and the diffuser portion, the first closing member having a first surface on the side of the combustion chamber and a second surface on the back side of the first surface, which is on the side of the pressurized gas chamber, the second closing member having a first surface on the side of the pressurized gas chamber and a second surface on the back side of the first surface, which is on the side of the diffuser portion, the first closing member having a fragile portion formed such that a part thereof is ruptured when the first surface receives a combustion gas pressure generated in the combustion chamber, and the ruptured portion is bent and opened toward the pressurized gas chamber, after the part of the first closing member is ruptured along the fragile portion, the ruptured portion being bent from a non-ruptured portion and opened so that a gas discharge path from the combustion chamber to the pressurized gas chamber is opened, a control device restricting an angle between the second surface of the first closing member and the bent ruptured portion to be 5 degrees to 85 degrees, the control device being a support portion which is formed to protrude from the second surface of the first closing member at a position such as to be in contact with the bent ruptured portion, the second closing member having a fragile portion formed such that a part thereof is ruptured when the first surface receives a gas pressure of a combustion gas generated in the combustion chamber and a pressurized gas, and the ruptured portion is bent and opened toward the diffuser portion, after the part of the second closing member is ruptured along the fragile portion, the ruptured portion being bent from a non-ruptured portion and opened so that a gas discharge path from the pressurized gas chamber to the diffuser portion is opened, a control device restricting an angle between the second surface of the second closing member and the bent ruptured portion to be 5 degrees to 85 degrees, the control device being,
a wall surface of the diffuser portion which is adjusted to have such a distance that the bent ruptured portion of the second closing member is in contact therewith, or
a support portion which is formed to protrude from the second surface of the second closing member at a position such as to be in contact with the bent ruptured portion.

5 . A gas generator comprising, in a cylindrical housing, a gas generation chamber and a diffuser portion provided with a gas discharge port,
the gas generation chamber being a combination of a combustion chamber accommodating a gas generating agent and an ignition device, and a pressurized gas chamber filled with a gas, the combustion chamber being arranged on the side of a first end surface of the cylindrical housing, the pressurized gas chamber being arranged on the side of a second end surface which is axially opposite to the first end surface of the cylindrical housing, and the diffuser portion being arranged between the combustion chamber and the pressurized gas chamber, a first closing member closing between the combustion chamber and the diffuser portion, and a second closing member closing between the diffuser portion and the pressurized gas chamber, the first closing member having a first surface on the side of the combustion chamber and a second surface on the back side of the first surface, which is on the side of the diffuser portion, the first closing member having a fragile portion formed such that a part thereof is ruptured when the first surface receives a combustion gas pressure generated in the combustion chamber, and the ruptured

Assignees

• Daicel Corp

Inventors

• Kobayashi Tomoharu
• Fukumoto Kenji

Classifications

• B60R21/261

  with means other than bag structure to diffuse or guide inflation fluid · CPC title

• B60R21/264 Primary

  using instantaneous generation of gas, e.g. pyrotechnic (B60R21/268 takes precedence) · 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

• B60R2021/26029

  Ignitors · CPC title

• B60R21/274

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