Igniter assembly and method for assembling igniter assembly

Patent metadata

Field	Value
Publication number	US-12038258-B2
Application number	US-202217697385-A
Country	US
Kind code	B2
Filing date	Mar 17, 2022
Priority date	Sep 20, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

An igniter assembly includes an igniter of an electric ignition type including: an ignition portion including an igniting agent; a holding portion made of resin and covering at least a portion of the ignition portion and holding the ignition portion; and an electro-conductive pin configured to energize the ignition portion, and also includes an igniter collar made of metal and to which the igniter is attached. The igniter collar includes a fixing portion surrounding the holding portion to fix it. The holding portion includes a protrusion portion formed continuously around a periphery of the holding portion and formed integrally with the holding portion. The protrusion portion is press-attached to the fixing portion in a state where the holding portion is fixed to the fixing portion.

First claim

The invention claimed is:

1. An igniter assembly, comprising:
an igniter of an electric ignition type including,
an ignition portion including an igniting agent,
a holding portion made of resin, covering at least a portion of a periphery of the ignition portion and holding the ignition portion, and
an electro-conductive pin configured to energize the ignition portion; and

an igniter collar made of metal and to which the igniter is attached, wherein
the igniter collar includes a fixing portion surrounding the holding portion to fix the holding portion,
the holding portion includes a surrounded surface surrounded by the fixing portion, the holding portion includes a protrusion portion protruding from the surrounded surface toward the fixing portion and formed continuously around a periphery thereof and formed integrally with the holding portion, wherein the protrusion portion has a deformed rib shape protruding from a contour of the surrounded surface, and
the protrusion portion is press-attached to the fixing portion in a state where the holding portion is fixed to the fixing portion.

2. The igniter assembly according to claim 1 , wherein
in the state where the holding portion is fixed to the fixing portion, the protrusion portion is pressed against the fixing portion and deformed in a direction along a height of the rib shape to be air-tightly brought into close contact with the fixing portion.

3. The igniter assembly according to claim 2 , wherein
the ignition portion includes,
a tubular peripheral wall portion,
a lid portion closing one end of the tubular peripheral wall portion, and
an accommodating space formed with the tubular peripheral wall portion and the lid portion and accommodating therein the igniting agent,

the lid portion is disposed in a manner such that the lid portion is located at a side toward which a combustion product of the igniting agent is discharged when the igniter is actuated,
the holding portion includes,
an inclined portion inclined downward of the igniter assembly and surrounding at least a portion of a periphery of the tubular peripheral wall portion and crimped at a tip end portion of the fixing portion,
an opposing portion opposed to a bottom surface portion of the fixing portion, and
a peripheral wall portion connecting the inclined portion and the opposing portion,

the protrusion portion is formed on at least any one of the inclined portion, the peripheral wall portion, or the opposing portion, and
the fixing portion surrounds at least a portion of the inclined portion, the peripheral wall portion, and the opposing portion to fix the holding portion.

4. The igniter assembly according to claim 2 , wherein
a plurality of the protrusion portions are formed on the holding portion,
the plurality of the protrusion portions include a first protrusion portion and a second protrusion portion, and
the first protrusion portion and the second protrusion portion are formed concentrically with respect to a center axis of the ignition portion and have different heights protruding from the holding portion.

5. The igniter assembly according to claim 2 , wherein
the fixing portion includes a groove portion formed at a position corresponding to the protrusion portion, and
in a case where the protrusion portion is press-attached to the fixing portion, the protrusion portion is fitted into the groove portion and is deformed into a shape corresponding to a shape of the groove portion.

6. The igniter assembly according to claim 1 , wherein
the ignition portion includes,
a tubular peripheral wall portion,
a lid portion closing one end of the tubular peripheral wall portion, and
an accommodating space formed with the tubular peripheral wall portion and the lid portion and accommodating therein the igniting agent,

the lid portion is disposed in a manner such that the lid portion is located at a side toward which a combustion product of the igniting agent is discharged when the igniter is actuated,
the holding portion includes,
an inclined portion inclined downward of the igniter assembly and surrounding at least a portion of a periphery of the tubular peripheral wall portion and crimped at a tip end portion of the fixing portion,
an opposing portion opposed to a bottom surface portion of the fixing portion, and
a peripheral wall portion connecting the inclined portion and the opposing portion,

the protrusion portion is formed on at least any one of the inclined portion, the peripheral wall portion, or the opposing portion, and
the fixing portion surrounds at least a portion of the inclined portion, the peripheral wall portion, and the opposing portion to fix the holding portion.

7. The igniter assembly according to claim 6 , wherein
a plurality of the protrusion portions are formed on the holding portion,
the plurality of the protrusion portions include a first protrusion portion and a second protrusion portion, and
the first protrusion portion and the second protrusion portion are formed concentrically with respect to a center axis of the ignition portion and have different heights protruding from the holding portion.

8. The igniter assembly according to claim 6 , wherein
the fixing portion includes a groove portion formed at a position corresponding to the protrusion portion, and
in a case where the protrusion portion is press-attached to the fixing portion, the protrusion portion is fitted into the groove portion and is deformed into a shape corresponding to a shape of the groove portion.

9. The igniter assembly according to claim 1 , wherein
a plurality of the protrusion portions are formed on the holding portion,
the plurality of the protrusion portions include a first protrusion portion and a second protrusion portion, and
the first protrusion portion and the second protrusion portion are formed concentrically with respect to a center axis of the ignition portion and have different heights protruding from the holding portion.

10. The igniter assembly according to claim 9 , wherein
the fixing portion includes a groove portion formed at a position corresponding to the protrusion portion, and
in a case where the protrusion portion is press-attached to the fixing portion, the protrusion portion is fitted into the groove portion and is deformed into a shape corresponding to a shape of the groove portion.

11. The igniter assembly according to claim 9 , wherein
the second protrusion portion is provided radially inward of the first protrusion portion with respect to the center axis of the ignition portion, and
the second protrusion portion has a higher height protruding from the holding portion than the first protrusion portion.

12. The igniter assembly according to claim 1 , wherein
a cross-sectional shape of the protrusion portion in a protruding direction from a surface of the holding portion is a rectangle shape, a trapezoid shape, or a semicircular shape, and a width of the cross-sectional shape is greater than a height of protrusion from a front surface.

13. The igniter assembly according to claim 1 , wherein
the fixing portion includes a groove portion formed at a position corresponding to the protrusion portion, and
in a case where the protrusion portion is press-attached to the fixing portion, the protrusion portion is fitted into the groove portion and is deformed into a shape corresponding to a shape of the groove portion.

14. The igniter assembly according to claim 1 , wherein
the protrusion portion is formed as a plurality of protrusions discontinuing in a circumferential direction of the holding portion before the plurality of

Assignees

• Daicel Corp

Inventors

• Yonezawa Kenichi

Classifications

• B60R2021/26029

  Ignitors · CPC title

• B60R21/2644 Primary

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

• F16B4/00

  Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits (restricted to metal parts or objects B23P11/02); Non-releasable friction-grip fastenings (F16B2/00 takes precedence) · CPC title

• F42B3/12 Primary

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

• B60R21/264

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