JP2020157954A - Airbag device - Google Patents

Abstract

To provide an airbag device which can reduce the number of components, which can achieve reduction in weight, and which can be assembled easily.SOLUTION: An airbag 10 and an inflator 20 of an airbag device 9 are assembled to a holding plate part 31 of a mounting base 30. The airbag includes: a body part 11; and an inflow port part 12 which allows an expansion gas from the inflator to flow into the body part by inserting a tip 20a side of the inflator. In the holding plate part 31, the inflow port part 12 is arranged on the inner peripheral side and it has an inner diameter dimension where the tip 20a side of the inflator can be press-fitted in the inflow port part, and also, a press-fitting holding part 40 is disposed having an inner diameter dimension capable of holding the inflow port part in which the tip side of the inflator is inserted after press-fitting is inserted.SELECTED DRAWING: Figure 4

Description

The present invention relates to an airbag device mounted on a vehicle, and more particularly to an airbag device capable of easily assembling an airbag and an inflator to a mounting base.

Conventionally, for example, in an airbag device for knee protection, an airbag that inflows an expansion gas and expands from a folded state, an inflator that supplies the expansion gas to the airbag, and an airbag and an inflator are held. Then, it was configured to include a case as a mounting base to be mounted on the mounting site (see, for example, Patent Document 1). Further, in this airbag device, the inflator is configured to include a substantially cylindrical inflator body that discharges expansion gas and a substantially cylindrical retainer that holds the inflator body, and also includes a retainer and an inflator body. The airbag and the inflator were attached and fixed to the case using the bolts that were projected from. That is, in this airbag device, the inflator body and the retainer are arranged inside the folded airbag, and each bolt extending from the inflator body and the retainer is projected to the outside of the airbag to project the bolt. Was projected from the bottom wall of the case containing the folded airbag, and a nut was fastened to the tip of each bolt to assemble the inflator and the airbag to the case.

JP-A-2018-167996

However, in the conventional airbag device, the airbag and the inflator are assembled to the case as the mounting base by using a plurality of bolts and nuts, which increases the number of parts and increases the cost and weight. Furthermore, it was difficult to assemble easily because it was necessary to fasten nuts to a plurality of bolts.

An object of the present invention is to solve the above-mentioned problems, and to provide an airbag device that can reduce the number of component parts, reduce the weight, and can be easily assembled.

In the airbag device according to the present invention, an airbag that expands by inflowing an expansion gas, an inflator that supplies the expansion gas to the airbag, and the airbag and the inflator are held at a mounting portion. An airbag device configured with a mounting base, which can be mounted.
The inflator has a substantially cylindrical shape in which a gas discharge portion for discharging expansion gas is arranged on the tip side.
The airbag communicates with a main body portion that expands by inflowing expansion gas from a folded state, and the tip side of the inflator is inserted to insert the expansion gas from the inflator into the main body portion. It is configured with a tubular inflow port that allows the gas to flow into the section.
The mounting base includes a holding plate portion for arranging the folded main body portion on the front surface side and arranging and holding the inflow port portion and the inflator inserted into the inflow port portion on the back surface side. ,
The holding plate portion
The inlet portion can be arranged on the inner peripheral side, and the tip side of the inflator can be press-fitted into the inlet portion, or the inlet portion with the tip side of the inflator inserted can be press-fitted. Inner diameter and
A press-fitting holding portion having an inner diameter that can hold the inflow port portion into which the tip end side of the inflator is inserted after press-fitting.
It is characterized in that it is configured by arranging.

In the airbag device according to the present invention, whether the inflow port extending from the main body of the folded airbag is arranged in the press-fitting holding portion of the holding plate portion of the mounting base and the tip side of the inflator is press-fitted into the inflow port. Alternatively, if the inflow port portion with the tip end side of the inflator inserted is press-fitted into the press-fitting holding portion, the press-fitting holding portion can hold the inflow port portion into which the tip end side of the inflator is inserted after press-fitting. Since the inner diameter is set, the inlet portion of the airbag and the tip side of the inflator inserted into the inlet portion are held by the press-fitting holding portion with respect to the holding plate portion of the mounting base. It will be assembled. In such an assembly structure, it is possible to easily assemble by simply press-fitting the inflator and the inlet portion of the airbag into the press-fitting holding portion provided on the holding plate portion without using bolts or nuts. it can.

Therefore, in the airbag device according to the present invention, the number of component parts can be reduced, the weight can be reduced, and the inflator and the inlet portion of the airbag are simply press-fitted into the press-fitting holding portion for mounting. The airbag and inflator can be easily assembled to the base.

Then, in the airbag device according to the present invention, on the inner peripheral side of the press-fitting holding portion, on the outer peripheral surface side of the inflow port portion in a state where the tip side of the inflator is inserted by rising from the surrounding general portion. It is desirable that a plurality of beads to be pressed are arranged.

In such a configuration, the outer peripheral surface of the inflator to be press-fitted or the outer peripheral surface of the inflator is not slid on the entire inner peripheral surface of the press-fitting holding portion by interposing the inlet portion. Since it is sufficient to slide the outer peripheral surface of the inlet portion to be press-fitted or the outer peripheral surface of the inflator having the inlet portion interposed therein with respect to a portion having a narrow area at the tip of the bead, the holding force after press-fitting The inflator and the inlet portion of the airbag can be smoothly press-fitted into the press-fitting holding portion in a state in which the decrease in the pressure is suppressed.

Further, in the airbag device according to the present invention, the holding plate portion is made of sheet metal.
The back surface side is provided with a recess adjacent to the press-fitting holding portion and capable of accommodating approximately half of the inflow port portion and the inflator in the axially orthogonal direction with the tip end side of the inflator inserted.
The press-fitting holding portion is a half-split annular body that is divided into a recess side and a side that covers the recess around the axis of the inflator, and the two half-split annular bodies are the shafts of the inflator. It is desirable that they are arranged so as to be displaced along the center.

In such a configuration, although the press-fitting holding portion is displaced along the axis of the inflator, it is configured as a half-divided annular body having approximately half a circumference, and the tip side of the inflator is inserted into the airbag. The entire circumference around the inflow port can be wrapped and held. Of course, since the two half-divided annular bodies, which are divided into two approximately half circumferences, are offset along the axis of the inflator, when forming a recess for accommodating the inflator by press working in the holding plate made of sheet metal, Along the axis of the inflator, a concave half-split ring that is recessed on the front surface side of the holding plate and a convex half-split ring that covers the recess that protrudes on the back surface side of the holding plate. It may be shifted and plastically deformed so as to have unevenness, and both can be easily formed.

Further, in the airbag device according to the present invention, the winding portion, which can be wound so that the airbag presses the circumference of the inflow port portion into which the tip end side of the inflator is inserted, toward the inflator side, is described. It is configured to be arranged at the inflow port.
It is desirable that the mounting base is provided with a locking portion for locking the locked portion provided at the terminal of the winding portion after winding.

In such a configuration, if the terminal provided with the locked portion is locked to the surrounding locking portion to prevent the winding portion from unraveling and maintain the winding state, the winding portion provides air. Since the inflow port of the bag is pressed against the outer peripheral surface of the inflator, the inner peripheral side of the inflator is in close contact with the outer peripheral surface of the inflator to exhibit good gas sealing performance, and the press-fit holding portion is the outer periphery of the inflator. Even if the configuration is not such that the entire circumference of the surface in the circumferential direction can be satisfactorily sealed, leakage of expansion gas can be accurately prevented. Further, if the winding portion is locked to the mounting base, the movement of the winding portion along the axis of the inflator such as the wound inflator can be suppressed, and the inflator and the inflator can be assembled to the mounting base. The position can be stabilized.

It is a schematic vertical sectional view which shows the vehicle-mounted state of the airbag device for knee protection of one Embodiment which concerns on this invention. It is a schematic perspective view seen from the back surface side (upper surface side) of the airbag device of an embodiment. It is a schematic exploded perspective view of the airbag device of an embodiment. It is a schematic vertical sectional view of the airbag device of an embodiment, and is a schematic vertical sectional view along the left-right direction. It is a schematic vertical sectional view of the airbag device of an embodiment, and corresponds to the VV part of FIG. It is a schematic vertical sectional view of the airbag device of an embodiment, and corresponds to the VI-VI part of FIG. It is a schematic vertical sectional view of the airbag device of an embodiment, and corresponds to the part VII-VII of FIG. It is a schematic vertical sectional view of the airbag device of an embodiment, and corresponds to the part VIII-VIII of FIG. It is a figure explaining the state which arranges the inlet part of the airbag in the press-fitting holding part of the mounting base of embodiment, and inserts the tip end side of an inflator. It is a schematic vertical sectional view along the left-right direction in the airbag device of the modification of embodiment. It is a schematic vertical sectional view of the airbag device shown in FIG. 10, and corresponds to the XI-XI portion of FIG. It is a schematic vertical sectional view of the airbag device shown in FIG. 10, and corresponds to the XII-XII portion of FIG. It is a figure which shows the modification of the winding part and the locking part of the airbag of an embodiment. It is a figure which shows the other modification of the winding part and the locking part of the airbag of an embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the airbag device 9 of the embodiment is for knee protection and is an instrument panel in front of the passenger seat (as appropriate). , Abbreviated as instrument panel) 6, specifically, it is mounted below the grab box 7 arranged on the lower side of the instrument panel 6. The grab box 7 includes a box main body 7a and a door portion 7b that closes the rear of the box main body 7a, and the door portion 7b is arranged so as to be openable so as to rotate the upper edge side rearward. Further, an undercover 8 is arranged below the grab box 7, and a door arrangement wall portion 71 of the airbag cover 70 described later in the airbag device 9 is arranged in the opening 8a of the undercover 8. , The airbag device 9 is mounted on the lower side in front of the passenger seat.

As shown in FIGS. 1 to 8, the airbag device 9 introduces an expansion gas into the airbag 10 and expands from the folded state so as to protect the knees of the occupant seated in the passenger seat. An inflator 20 for supplying the expansion gas G (see FIG. 4), a mounting base 30 for holding the airbag 10 and the inflator 20 and being mounted on the front lower side of the passenger seat as a mounting site, and a folded airbag 10 It is configured to include an airbag cover 70 that covers and is held by the mounting base 30.

The front-rear, up-down, and left-right directions in the present specification substantially correspond to the directions in the vehicle-mounted state, and as shown in FIGS. 1 to 3, the substantially rectangular holding plate of the mounting base 30. The long direction of the portion 31 will be the left-right direction, the short direction will be the front-back direction, and the orthogonal direction of the holding plate portion 31 will be the up-down direction.

As shown in FIGS. 1, 3, 4, and 9, the airbag 10 communicates with the main body 11 that expands by inflowing the expansion gas G from the folded state, and the tip 20a of the inflator 20. It is configured to include a tubular (cylindrical in the embodiment) inflow port portion 12 for inserting the side and allowing the expansion gas from the inflator 20 to flow into the main body portion 11. In addition, on the inflow port portion 12 side of the main body portion 11, the constituent material of the peripheral wall of the main body portion 11 extends, and a connecting sheet portion 18 for connecting the main body portion 11 and the inflow port portion 12 is arranged (FIG. 4). ~ 6), the connecting sheet portion 18 extending from the inflow port portion 12 side held by the mounting base 30 is configured so that the left and right swing of the main body portion 11 during expansion can be suppressed as much as possible.

As shown by the alternate long and short dash line in FIG. 1, the main body portion 11 pushes open the door portions 72 (F, B) of the airbag cover 70, which will be described later, and protrudes rearward and upward from the mounting base 30 to accommodate the occupant. In front of the left and right knees, the undercover 8 and the door portion 7b, and further, the instrument panel 6 expands in a substantially rectangular plate shape along the left and right side portions of the door portion 7b. The main body 11 at the completion of expansion includes a lower portion 11b protruding downward from the mounting base 30, a reversing portion 11c that reverses upward from the lower portion 11b, and an upper portion 11a arranged on the front side of the occupant's knee. ..

The inflow port portion 12 is provided with a winding portion 15 in the vicinity of the opening 13 of the terminal. The wrapping portion 15 is integrally (formed by being integrally woven) with the material of the inlet portion 12 of the airbag 10 (a base cloth for a bag woven from synthetic fibers such as polyester and polyamide). It is flexible so that it can be wound around the outer peripheral surface 12a side of the inflow port portion 12 which is separately formed into the inflow port portion 12 by suturing) and into which the tip 20a side of the inflator 20 is inserted. It has a band shape with sex. The terminal (tip) 16 of the winding portion 15 has a locking projection 59 as a locking portion provided on the mounting base 30 so that the winding state of the winding portion 15 wound around the inflow port portion 12 can be maintained. A locking hole 17 is formed as a locked portion into which (see FIG. 7) is inserted.

The main body 11 of the airbag 10 is arranged on the surface (lower surface) 31a side of the holding plate 31 described later of the mounting base 30 in a folded state, and the inflow port 12 extending from the main body 11 is held. It is arranged on the back surface (upper surface) side of the holding plate portion 31 through the insertion hole 35 described later in the plate portion 31. Then, the inflow port portion 12 through which the insertion hole 35 is inserted is assembled and held in the holding plate portion 31 together with the inflator 20 in a state where the tip 20a side of the inflator 20 is inserted.

The inflator 20 has a substantially columnar shape, and is configured by disposing a gas discharge portion 22 provided with a plurality of gas discharge ports 22a for discharging the expansion gas G at the tip 20a. A connector 24 for connecting an operation signal line LW for inputting an operation signal is arranged on the end surface of the inflator 20 on the base portion 20b side (see FIG. 4).

The mounting base 30 is made of sheet metal such as a steel plate and includes a holding plate portion 31 having a substantially rectangular plate shape. The holding plate portion 31 is provided with an assembling seat 32 for assembling the inlet portion 12 of the airbag 10 and the inflator 20 along the left-right direction on the front edge side, and the periphery of the assembling seat 32 is substantially flat. The support seat 51 supports the main body 11 of the folded airbag 10.

The assembly seat 32 is configured to be provided with a recess 33 that is recessed downward in a half-divided columnar shape so that the inlet portion 12 of the airbag 10 and the inflator 20 can be stored. The recess 33 is capable of accommodating substantially half of the inflow port portion 12 and the inflator 20 in the axially orthogonal direction with the tip 20a side of the inflator 20 inserted.

The assembly seat 32 is provided with a press-fitting holding portion 40 for assembling and holding the inflator 20 and the inflow port portion 12. In the press-fitting holding portion 40 of the embodiment, the inflow port portion 12 extending from the main body portion 11 through the insertion hole 35 is arranged on the inner peripheral side, and the tip 20a side of the inflator 20 can be press-fitted into the inflow port portion 12. A substantially cylindrical shape having an inner peripheral surface 41 having an inner peripheral dimension dh having a dimension dh (see FIGS. 3 and 5) and an inflow port portion 12 into which the tip 20a side of the inflator 20 after press fitting is inserted. It is said.

In particular, the press-fitting holding portion 40 of the embodiment is a half-divided annular body 44, 46 divided into a recess 33 side and a side covering the recess 33 around the axial center IC of the inflator 20, and is divided into two halves. The annular bodies 44 and 46 are arranged at positions shifted along the axial center (axial direction) IC of the inflator 20. On the inner peripheral surface 41 side of the press-fitting holding portion 40, a plurality of plurality of parts that rise from the surrounding general portion 42 and are pressed against the outer peripheral surface 12a side of the inflow port portion 12 in a state where the tip 20a side of the inflator 20 is inserted. A bead 43 is arranged.

The lower half-split ring 44 is arranged adjacent to the insertion hole 35, and beads 43 extending along the axial center IC of the inflator 20 are arranged at two front and rear positions on the inner peripheral surface 44a side. The upper half-split ring body 46 is arranged so as to be separated from the half-split ring body 44 in a direction away from the insertion hole 35, and a bead 43 extending along the axial center IC of the inflator 20 is provided on the inner peripheral surface 46a side. It is configured by arranging it in two places, front and back.

In the press-fitting holding portion 40 composed of the half-split annular bodies 44 and 46, the lower side 41b of the inner peripheral surface 41 is composed of the half-split annular body 44, and the upper side 41a of the inner peripheral surface 41 is composed of the half-split annular body 46. The inner diameter dimension dh of the press-fitting holding portion 40 is composed of an inner peripheral surface 41 formed by connecting the top portions 43a of the beads 43 arranged on the inner peripheral surfaces 44a, 46a side of the half-split annular bodies 44, 46. ..

Further, the lower half-split ring 44 is provided with a slit 45 extending in the front-rear direction. A connecting sheet portion 18 of the airbag 10 is arranged in the slit 45.

The portion of the recess 33 of the assembly seat 32 away from the insertion hole 35 is a semi-cylindrical support portion 48, which is an outer peripheral surface 21 on the base portion 20b side away from the gas discharge portion 22 on the tip 20a side of the inflator 20. It is configured to support the lower 21b. Similar to the press-fitting holding portion 40, the support portion 48 is provided with bead 49s that are raised along the axial center IC of the inflator 20 so as to be separated from each other in the front-rear direction. , The lower side 21b of the outer peripheral surface 21 of the inflator 20 is supported. Further, the support portion 48 is also provided with a slit 45 along the axial center IC of the inflator 20 (see FIG. 8).
Further, the support portion 48 is pressed against the upper edge side of the concave portion 33 so as to sandwich the side surface portions 21c and 21c facing each other in the front-rear direction of the outer peripheral surface 21 in the axially orthogonal direction of the inflator 20. 50 is projected.

As described above, in the assembly seat 32, along the axial center (axial direction) IC of the inflator 20 to be assembled, the insertion hole 35, the lower half-split ring 44, and the upper half-circle ring are in order from the left end side. The holding plate portion 31 provided with the assembly seat 32 can be easily formed by providing holes and irregularities by pressing the flat plate-shaped sheet metal material in which the 46 and the support portion 48 are arranged. ..

Mounting bracket portions 53 (L, R) for mounting the airbag device 9 to the mounting portion are formed on the left and right sides of the holding plate portion 31 of the mounting base 30. A mounting hole 53a is penetrated through the mounting bracket portion 53 (L, R), and the airbag device 9 is grabbed by fixing a bolt 3 penetrating the mounting hole 53a to the bracket 2 on the body 1 side with a nut 4. It can be mounted on the lower front side of the passenger seat below the box 7. Reinforcing ribs 57 are projected upward on the front and rear edges of the mounting bracket portions 53 (L, R).

Further, the mounting base 30 has a connecting recess 55 opened at the front and rear edges of the support seat 51 to insert and hold the connecting convex portion 76 of the airbag cover 70.

Further, a locking portion that locks the terminal 16 by inserting it into a locking hole 17 as a locked portion of the terminal 16 of the winding portion 15 in the vicinity of the half-split annular body 46 on the upper surface side of the support seat 51. The locking projection 59 is projected (see FIG. 7).

As shown in FIGS. 3 to 8, the airbag cover 70 is made of a synthetic resin such as a polyolefin-based thermoplastic elastomer, and is formed from a rectangular plate-shaped door-arranged wall portion 71 and the front and rear edges of the door-arranged wall portion 71. It is configured to include a connecting wall portion 75 (F, B) extending upward. A thin-walled planned rupture portion 73 along the left-right direction is disposed on the door arrangement wall portion 71, and when the main body portion 11 of the airbag 10 expands, the planned rupture portion 73 is ruptured and the door opens on both front and rear sides. Parts 72 (F, B) are arranged. The front and rear connecting wall portions 75 (F, B) are provided with a plurality of connecting convex portions 76 inserted and locked in the connecting concave portions 55 of the mounting base 30 at the upper ends.

Explaining the assembly work of the airbag device 9 of the embodiment, first, the main body 11 of the airbag 10 is folded and wrapped with a wrapping material (not shown) for preventing the airbag from collapsing. Next, the main body 11 of the airbag 10 is arranged on the front surface 31a side of the holding plate 31 of the mounting base 30, and the inflow port 12 is taken out to the back surface 31b side of the holding plate 31 through the insertion hole 35 and air. Each of the connecting convex portions 76 of the connecting wall portions 75F and 75B is inserted and locked into the corresponding connecting recess 55 of the holding plate portion 31 so as to wrap the main body portion 11 with the bag cover 70.

Then, the inflow port portion 12 through which the insertion hole 35 is inserted is inserted into the inner peripheral side of the half-split annular bodies 44 and 46 of the press-fitting holding portion 40. At this time, the connecting sheet portion 18 of the airbag 10 is inserted into the slit 45 of the half-split annular body 44, and the winding portion 15 is loosely wound around the inflow port portion 12 (see FIG. 9). ). Then, the tip 20a side of the inflator 20 is inserted from the opening 13 of the inflow port 12 to the inner peripheral surface 12b side of the inflow port 12, and further, into the press-fitting holding portion 40 composed of the half-split annular bodies 46 and 44. While press-fitting to the predetermined position shown by the alternate long and short dash line in FIG. 9, the base 20b side of the inflator 20 is fitted between the locking claws 50 and 50, and the base 20b side of the inflator 20 is inside the support 48. It is arranged on the peripheral side. Then, since the press-fitting holding portion 40 has an inflow port portion 12 into which the tip 20a side of the inflator 20 is inserted after press-fitting has an inner diameter dimension dh that can be held, press-fitting is performed on the holding plate portion 31 of the mounting base 30. Using the holding portion 40, the inlet portion 12 of the airbag 10 and the tip 20a side of the inflator 20 inserted into the inlet portion 12 are assembled so as to be held, and the airbag device 9 is assembled. be able to. In the case of the embodiment, after the inflator 20 and the inflow port portion 12 are press-fitted into the press-fitting holding portion 40, the terminal 16 of the winding portion 15 is pulled to insert the locking projection 59 into the locking hole 17. The terminal 16 of the winding portion 15 is locked to the locking projection 59.

After that, the operation signal line LW is connected to the connector 24 on the base portion 20b side of the inflator 20, and the mounting bracket portions 53 (L, R) of the mounting base 30 are connected by using the bolts 3 and nuts 4. When attached to the bracket 2 on the body 1 side, the airbag device 9 can be mounted on a predetermined mounting portion below the grab box 7.

If the inflator 20 is activated after the airbag device 9 is mounted, the expansion gas G is discharged from the gas discharge port 22a of the gas discharge unit 22, and the expansion gas that flows into the airbag 10 through the inflow port portion 12 is discharged. The main body portion 11 is expanded and expanded by G, and the door portions 72F and 72B of the airbag cover 70 are pushed open and arranged on the front side of the knee of the passenger in the passenger seat.

Then, in the airbag device 9 of the embodiment, the inflow port portion 12 extending from the main body portion 11 of the folded airbag 10 is arranged in the press-fitting holding portion 40 of the holding plate portion 31 of the mounting base 30, and the inflow port portion is provided. When the tip 20a side of the inflator 20 is press-fitted into the inflator 20, the press-fitting holding portion 40 has an inner diameter dimension dh that can hold the inflow port portion 12 into which the tip 20a side of the inflator 20 is inserted after the press-fitting. The press-fitting holding portion 40 is used to hold the inlet portion 12 of the airbag 10 and the tip 20a side of the inflator 20 inserted into the inlet portion 12 with respect to the holding plate portion 31 of the mounting base 30. It will be assembled like this. In such an assembled structure, the inflator 20 and the inlet portion 12 of the airbag 10 are simply press-fitted into the press-fitting holding portion 40 provided in the holding plate portion 31 without using bolts or nuts. It can be easily assembled.

Therefore, in the airbag device 9 of the embodiment, the number of component parts can be reduced, the weight can be reduced, and the inflator 20 and the inflow port portion 12 of the airbag 10 are simply press-fitted into the press-fitting holding portion 40. Only by itself, the airbag 10 and the inflator 20 can be easily assembled to the mounting base 30.

In the embodiment, the case where the inflow port portion 12 is arranged on the inner peripheral side of the press-fitting holding portion 40 and the tip 20a side of the inflator 20 is press-fitted into the inflow port portion 12 is illustrated. If there is a space around the inflator, the inflow port portion 12 with the tip 20a side of the inflator 20 inserted may be press-fitted into the press-fitting holding portion 40. By the way, in this case, in the embodiment, the inflow port portion 12 in which the tip 20a side of the inflator 20 is inserted is inserted into the press-fitting holding portion 40 from the base portion 20b side of the inflator 20, and is inserted into the press-fitting holding portion 40. It may be press-fitted.

Further, in the airbag device 9 of the embodiment, the inflow port portion 12 in a state in which the tip 20a side of the inflator 20 is inserted by rising from the surrounding general portion 42 on the inner peripheral surface 41 side of the press-fitting holding portion 40. A plurality of beads 43 pressed toward the outer peripheral surface 12a side are arranged.

Therefore, in the embodiment, the outer peripheral surface 12a of the inflow port portion 12 to be press-fitted or the inflow port portion 12 is interposed with respect to the entire inner peripheral surface 41 of the press-fitting holding portion 40 to form the outer peripheral surface 21 of the inflator 20. The outer peripheral surface 12a of the inflow port portion 12 to be press-fitted with respect to the narrow area portion (top) 43a at the tip of the bead 43, or the outer peripheral surface of the inflator 20 having the inflow port portion 12 interposed therebetween without sliding. Since the 21) may be slid, the inflator 20 and the inflow port portion 12 of the airbag 10 can be smoothly press-fitted into the press-fitting holding portion 40 in a state where the decrease in the holding force after press-fitting is suppressed. it can.

Further, in the airbag device 9 of the embodiment, the holding plate portion 31 is made of sheet metal, and the tip 20a side of the inflator 20 is inserted on the back surface (upper surface) 31b side adjacent to the press-fitting holding portion 40. It is provided with a recess 33 capable of accommodating approximately half of the inflow port portion 12 and the inflator 20 in the direction orthogonal to the axis. Then, the press-fitting holding portion 40 is formed into half-divided annular bodies 44 and 46 which are divided into a recess 33 side and a side covering the recess 33 around the axial center IC of the inflator 20, and two half-split annular bodies 44. , 46 are arranged at positions shifted along the axial center (axial direction) IC of the inflator 20.

Therefore, in the embodiment, although the press-fitting holding portion 40 is deviated along the axial center (axial direction) IC of the inflator 20, it is configured as half-divided annular bodies 44 and 46 for approximately half a circumference, and the inflator. It is possible to wrap and hold the entire circumference around the inflow port portion 12 of the airbag 10 into which the tip 20a side of the 20 is inserted. Of course, since the two half-divided annular bodies 44 and 46, which are divided into two substantially half circumferences, are displaced along the axial (axial center) IC of the inflator 20, the holding plate portion 31 made of sheet metal is pressed. When forming the recess 33 for accommodating the inflator, the half-split annular body 44 on the recess 33 side recessed on the front surface 31a side of the holding plate portion 31 and the side covering the recess 33 protruding toward the back surface 31b side of the holding plate portion 31. The convex half-divided annular body 46 may be displaced along the axial center IC of the inflator 20 and plastically deformed so as to have unevenness, and both can be easily formed.

Further, in the airbag device 9 of the embodiment, the winding portion 15 can be wound so that the airbag 10 presses the periphery of the inflow port portion 12 into which the tip 20a side of the inflator 20 is inserted toward the inflator 20 side. , As a locking portion for locking the locking hole 17 as a locked portion provided on the terminal 16 of the winding portion 15 after winding, which is configured to be arranged at the inflow port portion 12. The locking projection 59 of the above is arranged.

Therefore, in the embodiment, the terminal 16 provided with the locking hole 17 as the locked portion is locked to the locking projection 59 as the surrounding locking portion, and the winding portion 15 is prevented from being unwound and wound. If the attached state is maintained, the inflow port portion 12 of the airbag 10 is pressed against the outer peripheral surface 21 of the inflator 20 by the winding portion 15, so that the inside of the inflow port portion 12 is pressed against the outer peripheral surface 21 of the inflator 20. Even if the peripheral surface 12b side is in close contact with each other to exhibit good gas sealing property, and the press-fitting holding portion 40 is not configured to satisfactorily seal the entire circumference of the outer peripheral surface 21 of the inflator 20 in the circumferential direction, the expansion gas can be accurately obtained. Leakage of G can be prevented. Further, if the winding portion 15 is locked to the mounting base 30, the movement of the winding portion 15 along the axis IC of the inflator 20 such as the wound inflator 20 can be suppressed, and the inflow port portion 12 and the inflator portion 12 and the like. The assembly position of the inflator 20 with respect to the mounting base 30 can be stabilized.

If the press-fitting holding portion 40 can press-contact the inflow port portion 12 with respect to the entire circumference of the outer peripheral surface 21 of the inflator 20 in the circumferential direction without providing a bead, good sealing performance can be exhibited. Therefore, the winding portion 15 May be configured so as not to provide.

Further, in the embodiment, the half-split annular body 44 is provided with a slit 45 through which the connecting sheet portion 18 of the airbag 10 is inserted, and the main body portion 11 of the airbag 10 is a communication portion with the inflow port portion 12. Not only that, the inflator 20 also supports the inflator 20 over almost the entire length of the inlet portion 12 in the axial direction, so that the main body 11 can be prevented from swinging to the left and right during expansion and expansion, and the main body of the airbag 10 can be prevented from swinging. The portion 11 is quickly and stably arranged in front of the passenger in the passenger seat.

Further, if the slit 45 of the half-split annular body 44 is slightly expanded at the initial stage of press-fitting of the inflator 20, it can contribute to smooth press-fitting of the inflator 20.

Further, in the embodiment, the mounting base 30 made of sheet metal is illustrated, but the mounting base 30A may be formed from a synthetic resin such as polypropylene by molding as in the airbag device 9A shown in FIGS. 10 to 12. .. In the synthetic resin mounting base 30A formed by molding, the press-fitting holding portion 40A formed in the holding plate portion 31A is not substantially cylindrically displaced along the axial center IC of the inflator 20, but is around the axial center IC. Since it can be formed into a cylindrical shape surrounding the above, it may be formed into a cylindrical shape connected in the circumferential direction. A plurality of (four in the example) beads 43 are formed on the inner peripheral surface 41 of the press-fitting holding portion 40A along the axial center IC of the inflator 20, and the inflator 20 into the press-fitting holding portion 40A is formed. It is configured so that the sliding resistance at the time of press-fitting such as can be suppressed.

Further, in the synthetic resin mounting base 30A that can be formed by molding, the locking claws 50A and 50A provided on the support portion 48 side of the recess 33 of the assembly seat 32 can also increase the holding force. The upper portion 21d beyond the wide diameter region of the side surface portion 21c of the inflator 20 can be formed so as to be sandwiched. That is, the separation distance CW of the locking claws 50A and 50A on both sides can be made smaller than the diameter dimension ID of the inflator 20 and the base portion 20b of the inflator 20 can be fitted from above.

In the embodiment, the winding portion 15 provided at the inflow port portion 12 of the airbag 10 is locked to the locking projection 59 provided on the front edge side of the support seat 51, which is shown in FIG. As shown, a locking projection 59B as a locking portion provided on the support seat 51 on the front side of the inflator 20 is inserted into the locking hole 17 of the terminal 16, and the winding portion 15B is engaged with the locking projection 59B. You may stop it. The locking projection 59B may be formed from pins, bolts, or the like provided on the support seat 51, or may be cut up from the support seat 51 to form the locking projection 59C as shown in FIG. Often, the locking projection 59C as the locking portion is inserted into the locking hole 17 as the locked portion of the terminal 16 of the winding portion 15C, and the winding portion 15C is locked to the locking projection 59C. May be good.

Further, in the embodiment, the airbag device 9 for protecting the knee of the passenger in the passenger seat has been described, but the airbag device is assembled to the mounting base by inserting an inflator into the inlet portion of the airbag. If so, the present invention may be applied not only to the airbag device for protecting the knee, but also to the airbag device for the passenger seat that protects the upper body of the passenger in the passenger seat.

9, 9A ... (for knee protection) Airbag device, 10 ... Airbag, 11 ... Main body, 12 ... Inlet, 15, 15B, 15C ... Winding, 16 ... Terminal, 17 ... (Locked) ) Locking hole, 20 ... Inflator, 20a ... Tip, 22 ... Gas discharge part, 30, 30A ... Mounting base, 31, 31A ... Holding plate part, 31a ... (Front surface) lower surface, 31b ... (Back surface) upper surface, 33 ... Recesses, 40, 40A ... Press-fit holding part, 41 ... Inner peripheral surface, 42 ... General part, 43 ... Beads, 44 ... (Lower) half-split ring, 46 ... (Upper) half-split ring, 59, 59B, 59C ... (Locking part) Locking protrusion,
IC ... (inflator) axis, dh ... (inflator) inner diameter, G ... expansion gas.

Claims (4)

It is configured to include an airbag that expands by inflowing expansion gas, an inflator that supplies expansion gas to the airbag, and a mounting base that holds the airbag and the inflator and is attached to a mounting portion. It is an airbag device that is used.
The inflator has a substantially cylindrical shape in which a gas discharge portion for discharging expansion gas is arranged on the tip side.
The airbag communicates with a main body portion that expands by inflowing expansion gas from a folded state, and the tip side of the inflator is inserted to insert the expansion gas from the inflator into the main body portion. It is configured with a tubular inflow port that allows the gas to flow into the section.
The mounting base includes a holding plate portion for arranging the folded main body portion on the front surface side and arranging and holding the inflow port portion and the inflator inserted into the inflow port portion on the back surface side. ,
The holding plate portion
The inlet portion can be arranged on the inner peripheral side, and the tip side of the inflator can be press-fitted into the inlet portion, or the inlet portion with the tip side of the inflator inserted can be press-fitted. Inner diameter and
A press-fitting holding portion having an inner diameter that can hold the inflow port portion into which the tip end side of the inflator is inserted after press-fitting.
An airbag device characterized in that it is configured by arranging. On the inner peripheral side of the press-fitting holding portion, a plurality of beads that are raised from the surrounding general portion and pressed against the outer peripheral surface side of the inflow port portion in a state where the tip end side of the inflator is inserted are arranged. The airbag device according to claim 1, wherein the airbag device is provided. The holding plate is made of sheet metal.
The back surface side is provided with a recess adjacent to the press-fitting holding portion and capable of accommodating approximately half of the inflow port portion and the inflator in the axially orthogonal direction with the tip end side of the inflator inserted.
The press-fitting holding portion is a half-split annular body that is divided into a concave portion side and a side that covers the concave portion around the axis of the inflator, and the two half-split annular bodies are the shafts of the inflator. The airbag device according to claim 1 or 2, wherein the airbag device is arranged at a position shifted along the heart. The airbag is configured by disposing a winding portion, which can be wound so as to press the periphery of the inflow port portion into which the tip end side of the inflator is inserted, toward the inflator side. ,
Any of claims 1 to 3, wherein a locking portion for locking the locked portion provided on the terminal of the winding portion after winding is arranged on the mounting base. The airbag device according to item 1.

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