JPH11240405A - Cover body of air bag unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts by integrating engaging members and conventional disengagement prevention members by forming disengagement prevention portions in the engaging members, and steeply simplify the assembly process wherein an ornamental body is affixed to a cover portion in a cover body of an air bag unit to which an ornamental body of a separate member is attached to a cover portion which covers an air bag. SOLUTION: The cover body of an air bag unit has a cover portion 22 which covers an air bag and an ornamental member 31 which is attached to this cover portion 22. This ornamental member 31 is provided with an ornamental body 33 located on the surface of the cover portion 22, a leg portion 35 which protrudes from this ornamental body 33 and passes through the cover portion 22, and an insertion hole 34b located on the back side of the cover portion 22 into which the leg portion 35 may be inserted. The ornamental member 31 is also provided with an engaging member 34 which engages with a claw portion 35a formed at the tip of the leg portion 35. Flex prevention means 34c is formed integrated with the engaging member 34, and prevents the claw portion 35a from flexing to the inside of the insertion hole 28b after the ornamental body 33 has been engaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover body of an airbag device to which a decorative member is attached.

[0002]

2. Description of the Related Art Conventionally, an inflator for injecting gas,
An airbag device including an airbag that is inflated and deployed by the gas and a cover body that covers the airbag is used. The airbag is housed inside the cover body in a small folded state, and is inflated by the pressure of gas injected from the inflator upon collision of a car or the like, so that the cover formed of a soft resin is formed. -The body covering is torn apart and deployed to the front of the occupant or the like. Further, the airbag device is, for example, an airbag device incorporated in a central pad body of a steering wheel to protect a driver of an automobile from a collision impact.
An airbag device for a passenger on the front passenger seat built in the instrument panel, an airbag device for the rear seat built in the seatback of the front seat, or an airbag device provided beside the door or the seat for frontal collision Various aspects such as those described above have been developed and put into practical use.

In this type of airbag device,
For the purpose of decoration, a decorative mark such as a logo mark or car name,
2. Description of the Related Art There is known a configuration in which a cover portion of an airbag device is formed integrally with a covering portion.

However, in the configuration in which the decorative mark is formed integrally with the cover body, the decorative mark has the same texture and color tone as the entire cover body, and therefore is less noticeable and has a poor decorative effect. Have a problem.

When such a decorative mark is constituted by a decorative part separate from the covering part of the cover body,
It is necessary to firmly attach the decorative component to the covering portion made of a soft resin that deploys at a high speed when the airbag device operates.

In this regard, for example, a configuration described in Japanese Patent Application Laid-Open No. Hei 9-11838 is known. And this structure is provided with the covering part which covers an airbag, and the decorative component attached to this covering part, this decorative part is the decorative body arrange | positioned at the surface side of the said covering part, and this decorative body A leg portion projecting from and penetrating the covering portion, and a locking member disposed on the back side of the covering portion and coupled to the leg portion,
A retaining member is provided for retaining the retaining member by retaining to the leg portion.

However, in the above configuration, since the plate as the locking member and the retaining ring as the pull-out member constitute separate parts, the assembling process of attaching the decorative part to the covering part is complicated. With this configuration, even if the process is improved, it is difficult to further simplify the assembly process.

Further, for example, a configuration described in Japanese Patent Application Laid-Open No. 9-11833 is known. In this configuration, a separate decorative component is attached to the covering portion of the cover main body, and the decorative component includes a plate as an annular decorative body and an engaging body, and a plurality of legs forming leg portions. A decorative body is arranged on the front side of the covering part, and a plate is arranged on the back side. The shaft is inserted from the front side of the decorative body, and the stopper is integrally formed on the plate. The decorative component can be securely attached to the covering portion by engaging with the engaging hole as a member to prevent the decorative component from falling off.

However, in this configuration, by rotating the plate as an engaging body in a predetermined direction or moving the plate in a predetermined direction, the shaft constituting the leg portion is engaged with the engaging hole as a retaining portion. In this configuration, it is necessary to engage with and prevent the detachment, and the assembly process of attaching the decorative component to the covering portion is complicated, and it is difficult to further simplify the assembly process.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a cover body for an airbag device, in which a decorative member as a separate member is attached to a covering portion for covering the airbag. It is an object of the present invention to reduce the number of parts by integrating a stopper member and a conventional retaining member, and to greatly simplify an assembly process of attaching a decorative body to a covering portion.

[0011]

The cover body of the airbag device according to the present invention has a covering portion for covering the airbag, and a decorative member attached to the covering portion. A decorative body arranged on the front side of the covering portion, a leg protruding from the decorative body and penetrating the covering portion, and an insertion hole arranged on the back side of the covering portion and through which the leg portion can be inserted. And a locking member that engages with a claw portion formed at the tip of the leg portion, wherein the locking member has the claw portion inside the insertion hole after the decorative body is locked. A deflection preventing means for preventing bending is formed integrally. Further, it has a covering portion that covers the airbag, and a decorative member attached to the covering portion, and the decorative member is provided with a decorative body disposed on the surface side of the covering portion, and protruding from the decorative body. A leg portion penetrating the covering portion, and an insertion member disposed on the back surface side of the covering portion and provided with an insertion hole through which the leg portion can be inserted, and engaged with a claw portion formed at the tip of the leg portion. And a holding portion for holding a separate bending preventing means on the back surface of the locking member so that the claw portion does not bend inside the insertion hole after the decorative body is locked. Is formed. Furthermore, it has a covering portion for covering the airbag, and a decorative member attached to the covering portion, and the decorative member is provided with a decorative body disposed on the surface side of the covering portion and protruding from the decorative body. A leg portion penetrating the covering portion, and an insertion member disposed on the back surface side of the covering portion and provided with an insertion hole through which the leg portion can be inserted, and engaged with a claw portion formed at the tip of the leg portion. And engaging with the legs arranged on the back side of the locking member to prevent the claws from bending inside the insertion hole after the decorative body is locked. It is characterized by having a body bending preventing means.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a steering wheel of an automobile.
It comprises a steering wheel body 2 and an airbag device 3 mounted on the upper side of the steering wheel body 2 on the occupant side.

The steering wheel body 2 is
An annular rim portion (ring portion) 5 that is a grip steering portion, a boss portion 6 located inside the rim portion 5, and a rim portion 5
And three spokes 7 to which the boss 6 is connected.

A boss 4 fitted to the steering shaft 10 is disposed below the steering wheel body 2 on the vehicle body side, and the boss 4 and the core metal 51 of the rim portion are connected to each other. It is formed integrally by casting a die-cast metal, and a spoke for connecting the cored bar 51 and the boss 40 is formed.
The core metal 71 of the locking portion is formed. A skin portion 8 made of a soft synthetic resin or the like is formed on the outer peripheral portion of the core metal 51 of the rim portion 5 and the outer peripheral portion of the core metal 71 of the spoke portion 7 on the rim portion 5 side. ing.

As shown in FIGS. 1 to 3, the airbag device 3 includes a metal base plate 11,
The base plate 11 is attached to the steering wheel body 2 via a bracket or the like. The base plate 11 has an upper plate portion 11a having a substantially rectangular planar shape and a peripheral wall portion 11b bent downward from a peripheral edge of the upper plate portion 11a. The upper plate portion 11a is formed with a circular inflator mounting hole 11c and a plurality of mounting through holes 11d located around the inflator mounting hole 11c. An inflator 12, which is fitted into the inflator mounting hole 11c from below and injects gas, is mounted. Further, the upper surface of the upper plate 11a is covered with an airbag 14 so as to cover the upper side of the inflator 12.
Is mounted in a small folded state.

The inflator 12 has a substantially cylindrical main body portion 12a, and a plurality of gas injection ports 12b are formed at predetermined intervals on the outer peripheral portion of the gas discharge portion above the main body portion 12a. Have been. Further, a flange portion 12c is protruded from the outer periphery of the main body portion 12a.
A plurality of mounting holes 12d are formed in 2c.

Further, the airbag 14 has an inflation
The outer edges of an annular lower fabric material having an opening 14a through which the gas discharge portion of the filter 12 is inserted, and an upper fabric material having a circular shape having the same outer diameter as the lower fabric material are formed. It is sewn and formed into a bag shape. Also, as shown in FIG.
The peripheral portion of the opening 14a is reinforced by overlapping and sewing a cloth material, and a plurality of mounting through holes 14b are formed around the opening 14a.

Inside the airbag 14, an annular bag holder 16 for pressing the opening 14a of the airbag 14 is inserted. And this bag holder 1
The bolts 17 attached to the base plate 6 are respectively inserted into the mounting holes 14b of the airbag 14, the mounting holes 11d of the upper plate 11a of the base plate 11, and the mounting holes 12d of the inflator 12. The nut 18 is screwed in from the lower surface of the flange portion 12c in order to inflation.
An airbag 14 is fixedly fastened to the base plate 11 together with the base plate 12.

Furthermore, bracket portions 11e, each of which is attached to the boss plate 9, are formed on the peripheral wall portions 11b on both sides of the base plate 11.

As shown in FIGS. 1 to 3, a cover body 21 is attached to the base plate 11 so as to cover the folded airbag 14.
The cover body 21 is made of a thermoplastic elastomer.
The boss portion 6 and the sports body which are integrally formed by an injection molding method using a synthetic resin such as
The cover 7 has a covering portion 22 that covers a part of the covering portion 7, and a substantially rectangular tubular mounting wall portion 23 that projects downward from the back surface of the covering portion 22.

The cover body 21 is formed on the mounting wall 23 and the peripheral wall 11b with the mounting wall 23 fitted on the outside of the peripheral wall 11b of the base plate 11. The mounting wall 23 is fixed to the peripheral wall 11b of the base plate 11 by inserting a rivet (not shown) into the through holes 23a and 11f and caulking.

Further, as shown in FIGS. 1 to 4, a decorative member mounting portion 28 is integrally formed substantially at the center of the covering portion 22 of the cover body 21, and the decorative member mounting portion 28 is formed.
, A decorative member 31 is attached.

The decorative member mounting portion 28 has an annular recess 28a in which the surface side of the covering portion 22 is annularly recessed.
Are formed, and a through hole 28b communicating with the back surface side is formed at the center of the inside of the annular concave portion 28a. . The decorative member 31 is composed of a decorative body 33 having a disk shape and having legs 35 on the back surface, and a disk-shaped locking member 34 having a slightly larger diameter than the decorative body 33. .

The decorative body 33 is a disc-shaped member made of a thermoplastic resin such as ABS resin or polypropylene resin or various elastomers, and has leg portions 35 formed on the back surface thereof. Is inserted into the through hole 28b of the covering portion 22, and the disc-shaped portion is fitted into the annular concave portion 28a of the decorative member mounting portion 28.

The decorative body has a pair of leg portions 35 projecting from the back surface thereof, and a thicker nail portion 35a is formed at the tip of the leg portion 35 in a direction outward from the nail portion 35a. ing.

Then, the leg 35 is connected to the through hole 2 of the covering portion 22.
8b, the leg 35 is bent inward in the through hole 28b, and in this state, the leg 35 is
b, so that the claw portion 35a at the tip is exposed on the back surface side of the cover body 21.

On the other hand, as shown in FIGS. 3 and 4, the locking member 34 is made of, for example, a metal such as iron, aluminum, or stainless steel, or a thermoplastic resin such as ABS resin or polypropylene, and a circular plate made of an elastomer. The diameter of the main body is slightly larger than the diameter of the circular plate of the decorative body 33. The locking member 34 has a coating 2
Insertion hole 3 formed substantially equal to the inner diameter of the second through hole 28b
4b is formed, and a push-in portion 34a is integrally formed as a bending prevention means for preventing the claw portion 35a from bending inside the insertion hole 34b after the decorative body 33 is locked. In this embodiment, the pushing portion 34a is a disk-shaped portion extending from the insertion hole 34b to the center inside, and the pushing portion 34a is formed by pushing and bending the extending portion 34c to form the pair of claws 35a. It is pushed inward and acts as a deflection preventing means. Therefore, the outer diameter of the disc-shaped push-in portion 34 a is
It is slightly smaller than the inside diameter.

Therefore, in order to attach the decorative member 31 to the covering portion 22 of the cover main body 21, first, the locking member 34 is arranged at a predetermined position on the back side of the cover main body 21, and at the same time, The leg 35 of the decorative body 33 is inserted into the through hole 28b and the insertion hole 34b of the locking member 34 to cover
The decorative body 33 is fitted into the annular concave portion 28a of the decorative member mounting portion 28 of the main body 21 from the front side, and the claw portion 3 at the tip of the leg 35
5a is inserted into the insertion hole 34b of the locking member 34 (see FIG. 5A).

Then, in this state, the pushing portion 34a of the locking member 34 is pushed and bent (see FIG. 6A). Then
The pushing portion 34a is inserted inside the pair of claws 35a, and the claws 35a are engaged and locked by the locking members 34, so that the legs 35 are prevented from coming off.

Further, at this time, since the pushing portion 34a is pushed inside the pair of claws 35a, the claws 35a can be prevented from being bent inside the insertion hole 34b and the through hole 28b. Has become.

As shown in FIG. 3, a tear line 38, which is more fragile than other portions of the covering portion 22, is formed on the back surface of the covering portion 22 of the cover body 21. And
The tear line 38 is a central breaking line 3 extending in both directions.
8a and the center parting line 38a.
And a pair of side break lines 38b extending in the front-rear direction in the vicinity of both side portions of each of the first and second side portions is formed in a substantially H-shaped plane. The center breaking line 38a extends from the annular concave portion 28a of the covering portion 22 at a predetermined distance from the annular concave portion 28a.
It is formed so as to form a letter shape and to pass around. The center breaking line 38a may be formed in various shapes such as a straight line, a gentle curve, or a U-shape in a plane that bypasses the decorative member 31 in addition to the substantially V-shaped plane. Can be.

In the airbag device 3, when a vehicle collides, the igniter of the inflator 12 is activated by a signal from a collision diagnosis unit (not shown).
By burning the filled propulsion system, nitrogen gas or the like is rapidly injected into the inside of the airbag 14 from a gas injection port 12b formed on the peripheral surface of the inflator 12, and the folded airbag 14 is rapidly agitated. Swell. Then, due to the pressure of the inflation, the tear line 38 is broken from the center of the center breaking line 38a, and the covering portion 22 of the cover body 21 is torn along the tear line 38 to form a pair of front and rear doors. A piece is formed. Further, when the airbag 14 is inflated, these door pieces are developed back and forth while the decorative member 31 is held on one side of the front door to form a projecting opening of the airbag 14, and the air is passed through the projecting opening. The bag 14 projects and inflates and deploys to the front side of the occupant.

In the above embodiment, the locking member 3
Reference numeral 4 denotes a circular insertion hole 34b and a disc-shaped push-in portion 3.
4a was formed (see FIG. 6 (C)), which was
This corresponds to the fact that the pair of leg portions 35 of the decorative body 33 are formed in a substantially arc-shaped cross section as shown in FIG. For example, as shown in FIG. 5B, a pair of legs 3
When 5 'is formed to have a substantially rectangular cross section, a locking member 34' having a square hole-shaped insertion hole 34b 'and a square dish-shaped insertion portion 34a' is preferable (FIG. 6 ( B)).

Further, in the above embodiment, the decoration 3
A pair of (that is, two) leg portions 35 are protruded from the back surface of 3. For example, as shown in a decorative body 33 ″ shown in FIG. It can also be protruded at a position. Since the leg 35 "of the decorative body 33" is also formed in a substantially arc-shaped cross section, it is preferable that the locking member has a shape shown in FIG. 6 (C).

In the above embodiment, the decoration 33
A pair of leg portions 35 are protrudingly provided on the back surface of FIG.
As shown in a decorative body 33 ″ ″ shown in FIG.
Can be projected at circularly symmetric positions. This decoration 3
3 ″ ″, like a locking member 34 ″ ″ shown in FIG.
Substantially square hole-shaped insertion hole 34b '''and square dish-shaped push-in portion 3
4a "" is a locking member 3 formed circularly symmetrically at a predetermined position.
4 ″ ′ corresponds.

In the above-described embodiment, the push-in portion 34a as the deflection preventing means is formed integrally with the locking member 34. However, for example, like the annular deflection preventing member 40 shown in FIG. The locking member 44 is provided with a separate bending preventing means. The locking member 44 has three holding portions 44a for holding the separate bending preventing member 40 at three circularly symmetric positions. The insertion holes 44b having a substantially rectangular shape can also be formed at three locations at predetermined intervals alternately with the holding portions 44a at circularly symmetric positions.

Further, as shown in FIGS. 9 and 10, bending prevention members 50 and 60 are inserted from the back side as separate bending prevention means into the locking member 54 having a round hole-shaped insertion hole 54b. Thus, it can be engaged with the leg 135. This engagement is performed by an engagement recess 135 formed inside the leg 135.
f, head 50g (or 60g) and shaft 50h (or 6
0h) is formed by engaging an annular engaging projection 50f (or 60f) with the shaft of the deflection preventing member 50 (or 60) made of Oh). Since the deflection preventing member 60 shown in FIG. 10 is configured to cover the claw portion 135a with the head 60g, the claw portion 135 is expanded when the airbag is deployed.
It is possible to prevent the tip of a from breaking.

[0038]

According to the cover body of the airbag device of the present invention, since the claws are prevented from being bent inside the insertion hole after the decorative body is locked, the bending preventing means is provided. It is possible to easily and reliably attach a soft decorative body made of various elastomer resins to the covering portion. Further, by integrating the deflection preventing means with the locking member, it is possible to reduce the number of parts, simplify the assembling process, and reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a steering wheel provided with an airbag device of the present invention.

FIG. 2 is a cross-sectional view of the airbag device of the present invention.

FIG. 3 is an exploded perspective view showing an example of an embodiment of a cover body of the airbag device of the present invention.

FIG. 4 is an enlarged exploded perspective view showing an embodiment of a cover body of the present invention.

FIG. 5A is a sectional view of a part of a cover body of the present invention, and FIG.
(D) is a rear view showing the embodiment of the decorative body.

FIG. 6A is a partial cross-sectional view for explaining the operation of the pushing portion of the present invention, and FIGS. 6B and 6C are perspective views showing an embodiment of the locking member of the present invention.

7A is a partial cross-sectional view showing another embodiment of the cover body of the present invention, FIG. 7B is a rear view of the decorative body, and FIG. 7C is a rear view of the locking member. .

8A is a cross-sectional view of a part of the cover body, FIG. 8B is a rear view of the cover body, FIG. 8C is a perspective view of the locking member, and FIG. 8D is a perspective view of the bending prevention member. .

FIG. 9 is a partial cross-sectional exploded perspective view showing another embodiment of the cover body of the present invention.

FIG. 10 is a partial cross-sectional exploded perspective view showing another embodiment of the cover body of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering wheel main body 3 Airbag device 4 Boss 5 Rim section 6 Boss section 7 Spoke section 8 Skin section 10 Steering shaft 11 Base plate 11a Upper plate section 11b Peripheral wall section 11c Inflation Mounting hole 11d Mounting hole 11e Bracket part 11f Through hole 12 Inflator 12a Main body part 12b Gas injection port 12c Flange part 12d Mounting through hole 14 Airbag 14a Opening 14b Mounting through hole 16 Bag holder 17 Bolt 18 Nut 21 Cover − Body 22 Covering part 23 Mounting wall part 23a Through hole 28 Decorative member mounting part 28a Annular concave part 28b Through hole 31 Decorative member 33,133 Decorative body 34 Locking member 34a Push-in part 34b Insertion hole 34c Extension part 35,135 Leg 35a Claw part 38 Tear line 38a Center breaking line 38b Side breaking line 40, 50, 60 Deflection prevention member 44, 54 Locking member 44a Retaining part 44b Insertion hole 51 Core metal 71 Core metal

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 16, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 9

FIG. 10

FIG. 6

FIG. 7

FIG. 8

Claims (3)

[Claims] 1. A covering member for covering an airbag, and a decorative member attached to the covering member. The decorative member includes a decorative member disposed on a surface side of the covering member, and a decorative member. A leg portion protruding and penetrating the covering portion; and an insertion hole which is disposed on the back side of the covering portion and through which the leg portion can be inserted, and engages with a claw portion formed at the tip of the leg portion. And a locking member, wherein the locking member is integrally formed with a bending preventing means for preventing the claws from bending into the insertion hole after the decorative body is locked. A cover body for an airbag device, characterized in that: 2. A covering member for covering the airbag, and a decorative member attached to the covering member. The decorative member includes a decorative member arranged on the surface side of the covering member, and a decorative member. A leg portion protruding and penetrating the covering portion; and an insertion hole which is disposed on the back side of the covering portion and through which the leg portion can be inserted, and engages with a claw portion formed at the tip of the leg portion. A locking member, and a back surface of the locking member holds a separate bending preventing means for preventing the nail portion from bending into the insertion hole after the decorative body is locked. A cover body of an airbag device, wherein a holding portion is formed. 3. A cover member for covering the airbag, and a decorative member attached to the cover member, wherein the decorative member includes a decorative member arranged on a surface side of the cover member and a decorative member. A leg portion protruding and penetrating the covering portion; and an insertion hole which is disposed on the back side of the covering portion and through which the leg portion can be inserted, and engages with a claw portion formed at the tip of the leg portion. And a locking member, which is disposed on the back side of the locking member and engages with the leg,
A cover body for an airbag device, further comprising a separate bending preventing means for preventing the claws from bending inside the insertion hole after the decorative body is locked.