Initiator for a gas generator of vehicle safety device

Patent metadata

Field	Value
Publication number	US-11760303-B2
Application number	US-202117233582-A
Country	US
Kind code	B2
Filing date	Apr 19, 2021
Priority date	Apr 19, 2021
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

An initiator for a gas generator of a vehicle safety device includes a cup defining an interior, a primary pyrotechnic material disposed in the interior of the cup, and a secondary pyrotechnic material disposed in the interior of the cup. A separator member hermetically separates the primary pyrotechnic material from the secondary pyrotechnic material.

First claim

What is claimed is:

1. An initiator for a gas generator of a vehicle safety device, the initiator comprising:
a cup defining an interior;
a primary pyrotechnic material disposed in the interior of the cup;
a secondary pyrotechnic material disposed in the interior of the cup;
a separator member hermetically separating the primary pyrotechnic material from the secondary pyrotechnic material;
a pair of electrical pins and a bridge wire, the bridge wire in direct contact with the primary pyrotechnic material of the initiator, the pair of electrical pins in reaction initiating communication with the primary pyrotechnic material through the bridge wire, and
an adaptor at least partially disposed in the interior of the cup, the adaptor holding the primary pyrotechnic material, the separator member connected to the cup through the adaptor
wherein the primary pyrotechnic material directly contacts a first side of the separator member and the secondary pyrotechnic material directly contacts a second side of the separator member, and
wherein the adaptor includes a central opening including a first portion containing the primary pyrotechnic material.

2. The initiator of claim 1 , wherein the separator member includes a weakened zone configured to open in response to ignition of the primary pyrotechnic material.

3. The initiator of claim 1 , wherein the separator member is constructed of metal.

4. The initiator of claim 1 , wherein the separator member includes a cylindrical sidewall extending from a disk-shaped portion, the cylindrical sidewall circumferentially surrounding a portion of the adaptor.

5. The initiator of claim 1 , wherein the cup includes a closed end and an open end, the cup having a cup sidewall secured to the separator member proximate the open end of the cup.

6. The initiator of claim 1 , wherein the adaptor, the cup and the separator member are each constructed of metal and the cup is welded to the adaptor and the separator member is welded to the adaptor and further wherein the adaptor is cylindrical in shape, the cup welded to the adaptor proximate a first axial end of the adaptor and the separator member welded to the adaptor proximate a second axial end of the adaptor.

7. The initiator of claim 1 , wherein the adaptor defines a cavity receiving the primary pyrotechnic material.

8. The initiator of claim 1 , wherein the adaptor includes a first axial end with a first outer diameter and a second axial end with a second outer diameter, the second outer diameter being greater than the first outer diameter, the separator member secured directly to the first outer diameter, the cup secured directly to the second outer diameter.

9. The initiator of claim 1 , wherein the cup defines an open axial end and a closed axial end, the separator member disposed in the cup completely between the open axial end and the closed axial end.

10. The initiator of claim 1 , wherein the adaptor includes an upper axial end, the central opening open at the upper axial end, the separator member abutting the upper axial end to close the central opening.

11. The initiator of claim 1 , wherein the separator member is formed separate from the cup and spaced from the cup.

12. The initiator of claim 1 , wherein the interior of the cup includes a first axial portion adjacent to a closed end of the cup and a second axial portion adjacent to an open end of the cup, the first axial portion filled with the secondary pyrotechnic material, and wherein the initiator further includes the adaptor at least partially disposed in the second axial portion of the interior of the cup, the adaptor holding the primary pyrotechnic material, the separator member secured to the adaptor.

13. A initiator for a gas generator of a vehicle safety device, the initiator comprising:
a cup defining an interior, the cup including a closed end, an open end, and a cylindrical sidewall extending therebetween;
a base member at least partially disposed in the cup, the base member including an axially extending opening, the axially extending opening having a portion containing a first pyrotechnic material, the cylindrical sidewall of the cup attached to the base member about a circumference of the base member;
a second pyrotechnic material disposed in the interior of the cup;
a separator member attached to the base member and closing one end of the axially extending opening to hermetically separate the first pyrotechnic material from the second pyrotechnic material;
a pair of electrical pins and a bridge wire, the bridge wire in direct contact with the first pyrotechnic material of the initiator, the pair of electrical pins in reaction initiating communication with the first pyrotechnic material through the bridge wire, and
an adaptor at least partially disposed in the interior of the cup, the adaptor holding the first pyrotechnic material, the separator member connected to the cup through the adaptor,
wherein the primary pyrotechnic material directly contacts a first side of the separator member and the second pyrotechnic material directly contacts a second side of the separator member, and
wherein the adaptor has and opening containing the primary pyrotechnic material.

14. The initiator of claim 13 , wherein the second pyrotechnic material is axially between the separator member and the closed end of the cup.

15. The initiator of claim 13 , wherein the separator member is welded to a first axial end of the base member.

16. The initiator of claim 13 , wherein the separator member is constructed of metal.

17. The initiator of claim 13 , wherein the base member, the cup and the separator member are each constructed of metal and wherein the cup is welded to the base member and the separator member is welded to the base member.

18. The initiator of claim 13 , wherein the interior of the cup includes a first axial portion adjacent to a closed end of the cup and a second axial portion adjacent to an open end of the cup, the first axial portion filled with the second pyrotechnic material, and wherein the initiator further includes the adaptor at least partially disposed in the second axial portion of the interior of the cup, the adaptor holding the first pyrotechnic material, the separator member secured to the adaptor.

19. An initiator for a gas generator of a vehicle safety device, the initiator comprising:
a cup defining an interior;
a primary pyrotechnic material disposed in the interior of the cup;
a secondary pyrotechnic material disposed in the interior of the cup;
a separator member hermetically separating the primary pyrotechnic material from the secondary pyrotechnic material;
a pair of electrical pins and a bridge wire, the bridge wire in direct contact with the primary pyrotechnic material of the initiator, the pair of electrical pins in reaction initiating communication with the primary pyrotechnic material through the bridge wire; and
an adaptor disposed in the interior of the cup, the adaptor including an upper portion radially surrounding the primary pyrotechnic material,
wherein the primary pyrotechnic material directly contacts a first side of the separator member and the secondary pyrotechnic material directly contacts a second side of the separator member.

20. The initiator of claim 19 , wherein the separator member includes a planar disk shaped portion flush against an upper surface of the adaptor, the disk shaped portion closing an opening in the adaptor containing the primary pyrotechnic material.

Assignees

• Autoliv Asp Inc

Inventors

• Peremarty Francois
• Hubbard Ryan Mark
• Wayment Mason
• Guymon Jesse
• Carver Paul Robert

Classifications

• B60R21/264 Primary

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

• B60R21/2644 Primary

  using only solid reacting substances, e.g. pellets, powder · CPC title

• B60R2021/26029

  Ignitors · CPC title

• F42B3/12

  Bridge initiators {(F42B3/103, F42B3/11, F42B3/195 take precedence; electric ignitors in propellant charges F42C19/12)} · CPC title

• F42C19/02

  Fuze bodies; Fuze housings · CPC title