Actuator for airbag device
An actuator is attached to a side of a housing portion and couples a coupling means extending from an airbag. The actuator includes a holding part that holds a squib, and a cap part disposed on the other end side of the holding part so as to face the squib. The holding part includes a cylindrical part that covers a proximal part side of the squib over an entire circumference. The cap part includes a ceiling part, and a peripheral wall part having a cylindrical shape extending from a peripheral edge of the ceiling part and covering an inner peripheral side of the cylindrical part. When the ceiling part receives the pressure of a combustion gas generated when the squib operates, the cap part moves the ceiling part while detaching the peripheral wall part from the cylindrical part, whereby the coupling to the coupling means can be released.
1 . An actuator for an airbag device that is attached to a side of a housing portion housing an airbag which is folded,
the actuator having a configuration in which an inflated state of the airbag can be controlled by coupling a coupling means extending from the airbag and by maintaining or releasing a coupled state to the coupling means, and
the actuator comprising: a squib; a holding part that holds the squib on one end side; and a cap part that is disposed on an other end side of the holding part so as to face the squib,
wherein
the holding part includes a cylindrical part capable of covering a side on at least a proximal part side of the squib over an entire circumference,
the cap part
includes a ceiling part arranged to face the squib, and a peripheral wall part having a cylindrical shape extending from a peripheral edge of the ceiling part and arranged to cover an inner peripheral side or an outer peripheral side of the cylindrical part, is configured to close the other end side of the holding part, wherein the peripheral wall part is arranged on the inner peripheral side of the cylindrical part, and
is configured to be attached to the holding part by locking the peripheral wall part to the cylindrical part, and when attached to the holding part, an inserted state where the cylindrical part or the peripheral wall part is inserted into an insertion hole formed on a tip side of the coupling means can be maintained, and
when the ceiling part receives a pressure of a combustion gas generated when the squib operates, coupling to the coupling means can be released by moving the ceiling part while detaching the peripheral wall part from the cylindrical part, wherein
a locking recess part or a locking projection that can be locked to each other is formed on an inner peripheral surface side of the cylindrical part or an outer peripheral surface side of the peripheral wall part, respectively,
both the locking recess part and the locking projection are formed over an entire circumference of the cylindrical part or the peripheral wall part,
the locking projection includes inclined surfaces on both end sides in a direction in which the peripheral wall part is inserted into the cylindrical part,
the locking recess part includes inclined surfaces formed to correspond to the inclined surfaces of the locking projection,
the locking projection is provided on the outer peripheral surface side of the peripheral wall part,
the locking recess part is provided on the inner peripheral surface side of the cylindrical part,
a cross-sectional of the locking projection in a direction in which the peripheral wall part is inserted into the cylindrical part has a flat, substantially trapezoidal shape,
a width dimension of the locking projection along the direction in which the peripheral wall part is inserted into the cylindrical part and the width dimension of the locking recess part are substantially same, and
a protrusion amount by which the locking projection protrudes is smaller than a recess amount by which the locking recess part recedes.
2 . The actuator for the airbag device according to claim 1 , wherein
the cap part is formed by curving an inner peripheral surface side, stretching from the peripheral wall part to the ceiling part, into a hemispherical shape.
3 . The actuator for the airbag device according to claim 1 , wherein
an inclination angle of the inclined surfaces with respect to the outer peripheral surface side of the peripheral wall part in the direction in which the peripheral wall part is inserted into the cylindrical part is about 20 degrees.
4 . An actuator for an airbag device that is attached to a side of a housing portion housing an airbag which is folded,
the actuator having a configuration in which an inflated state of the airbag can be controlled by coupling a coupling means extending from the airbag and by maintaining or releasing a coupled state to the coupling means, and
the actuator comprising: a squib; a holding part that holds the squib on one end side; and a cap part that is disposed on an other end side of the holding part so as to face the squib,
wherein
the holding part includes a cylindrical part capable of covering a side on at least a proximal part side of the squib over an entire circumference,
the cap part
includes a ceiling part arranged to face the squib, and a peripheral wall part having a cylindrical shape extending from a peripheral edge of the ceiling part and arranged to cover an inner peripheral side or an outer peripheral side of the cylindrical part, is configured to close the other end side of the holding part, and
is configured to be attached to the holding part by locking the peripheral wall part to the cylindrical part, and when attached to the holding part, an inserted state where the cylindrical part or the peripheral wall part is inserted into an insertion hole formed on a tip side of the coupling means can be maintained, and
when the ceiling part receives a pressure of a combustion gas generated when the squib operates, coupling to the coupling means can be released by moving the ceiling part while detaching the peripheral wall part from the cylindrical part, wherein
the cap part is formed by curving an inner peripheral surface side, stretching from the peripheral wall part to the ceiling part, into a hemispherical shape,
there is a gap between the squib and the cap part, and
a separation distance between a radial center of the inner peripheral surface side and a cover of the squib in a state in which the cap part is attached to the holding part and the cover faces the inner peripheral surface side is greater than or equal to a radial dimension of the cover.
5 . The actuator for the airbag device according to claim 4 , wherein
the peripheral wall part is arranged on the inner peripheral surface side of the cylindrical part, and is configured such that a region on a tip side portion of the peripheral wall part covers a side surface of the squib with no gap.