JP6548330B2 - Air bag device cover - Google Patents

Description

  The present invention relates to a cover body of an air bag apparatus provided with a groove-like tear line which is cleaved at the time of inflation and deployment of the air bag to form a door.

  2. Description of the Related Art Conventionally, an airbag apparatus is known which is disposed, for example, on an installation part such as an instrument panel of an automobile or a steering wheel. The air bag apparatus comprises a box-like case body, and the inside of the case body contains a folded air bag and an inflator for injecting a gas for inflating the air bag, and the case body The upper opening of the is covered by the cover body. In the cover body, a tear line is formed in a lid portion which is an opposing portion facing the air bag, and a portion surrounded by the tear line is defined as a planned door portion. Then, at the time of a collision of a car or the like, the airbag into which the inflation gas is blown from the inflator pushes up the door planned portion covering the bulging side of the airbag, and the tearing line is broken by the pressure of the inflation and the lid portion The door flap or door is configured to open.

  In such an air bag device, in order to promote the expansion of the door portion accompanying the expansion and expansion of the air bag, a convex portion is provided at a position corresponding to the tear line at the lid portion of the cover body. It is known that the pressure of the air bag is transmitted to the tear line by contacting the convex portions, thereby promoting tearing of the tear line (see, for example, Patent Document 1).

JP, 2001-88646, A (page 4-5, FIG. 4)

  However, in the case of the cover body of the above-mentioned airbag device, the load exerted by the reaction force from the convex portion on the surface of the inflated airbag is not taken into consideration, and the airbag needs to be additionally reinforced. Cost may increase.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a cover body of an air bag device capable of efficiently tearing a tear line while suppressing increase in cost and load on the air bag. .

The cover body of the air bag device according to claim 1 is provided at an opposite portion covering the stored air bag, and at a side opposite to the air bag of the opposite portion, which divides the opposite portion. A groove-like tear line which is cleaved at the time of inflation and deployment to form a door portion, and a pair of convex portions which constitute both sides of at least a part of the tear line and which project on the opposite side of the opposite portion. And the convex portion forming the pair is inclined so as to gradually project from the air bag side to the tear line side of the tear line side surface portion forming the side surface of the groove-like tear line and the opposing portion. the a said facing portion is deformed the tear line side portion is inclined portion in a state serving as the surface along the surface of the airbag hits the inflation and deployment of the airbag, wherein by inflation and deployment of the air bag The deformation of the facing portion upon cleavage of the aligned and forms a surface along the surface of the airbag.

Cover of airbag devices 請 Motomeko 2 in that in the cover of the airbag apparatus according to claim 1 Symbol mounting, comprising a plurality of skin members joined together at the ends, facing the airbag facing portion A cover covering at least a part of the side opposite to the side, and a recess corresponding to a part corresponding to at least a part of a tear line on the side opposite to the side facing the airbag of the opposite part; And an accommodating portion for accommodating the end portions of the skin members joined to each other, and a pair of convex portions are provided at positions corresponding to both sides of the accommodating portion on the side of the opposing portion facing the airbag. It is arranged.

According to the cover body of the air bag device according to claim 1, each convex portion is gradually projected from the air bag side of the opposing portion toward the tear line side from the tear line side surface portion forming the side surface of the grooved tear line. In which the opposite portion is deformed by inflation and deployment of the airbag so that the inclined portion becomes a surface along the surface of the airbag in a state where the side portion of the tear line abuts. The convex portion in contact with the bag forms a surface along the surface of the air bag by the deformation of the opposing portion, effectively transmitting the inflation pressure of the air bag to the tear line without applying a large load to the air bag, from the convex portion Effectively tearing the tear line while suppressing the cost increase such as reinforcement to the load of the air bag to the air bag and the load applied to the air bag from the convex portion Kill.

According to the cover of the airbag apparatus 請 Motomeko 2 wherein, in addition to the effect of the cover body of an airbag apparatus according to claim 1, a housing part for housing the ends joined together skin member of the epidermal body The opposing portion is recessed along the position corresponding to at least a part of the tear line on the side opposite to the side facing the airbag, and the pair of convex portions is on the side of the opposing portion facing the airbag. By arranging at the positions corresponding to both sides, the facing portion can be covered with a good appearance by the skin body, and both sides of the storage portion can be reinforced by the pair of convex portions, and thermal deformation of the facing portion can be suppressed.

It is sectional drawing which shows the expansion | deployment behavior of the airbag of one embodiment of the cover body of the airbag apparatus of this invention in order of (a) thru | or (c). It is an enlarged view of a part of Fig.1 (a). It is a disassembled perspective view of a cover body same as the above. It is a top view which shows a cover body same as the above from the air bag side. It is a perspective view which shows the installation state to the installation part of a cover body same as the above. It is a perspective view which shows the unfolded state of the door part of a cover body same as the above.

  Hereinafter, an embodiment of a cover body of an air bag device of the present invention will be described with reference to the drawings.

  In FIG. 5, reference numeral 10 denotes an air bag device, and the air bag device 10 is, for example, an air bag for passenger seat occupants provided in an opening 13 as an installed portion opened at the top of an instrument panel 12 of a car. The apparatus 10 is configured. And the instrument panel part 12 is provided in the front part of a compartment over substantially the full length of a vehicle width direction, and the front window glass which is not shown in figure is located above this instrument panel part 12. As shown in FIG. Then, an air bag device 10 is installed inside the instrument panel unit 12 so as to face the passenger on the passenger seat. Then, as shown in FIG. 1, the airbag device 10 is folded at the upper portion of the case body, an unshown case body which is an attached member and is also referred to as a retainer, an unillustrated inflator disposed at the lower portion of the case body. , And a cover 18 that covers the case opening of the upper part of the air bag 17 or the case body. Furthermore, a hook having a substantially C-shaped cross section or the like is attached to the outer side surface of the upper portion of the case body as a mounting portion to be engaged with the cover body 18. As the inflator, various types of inflators are used such as a combustion type (pyro type), a stored type which compresses and stores gas, and a hybrid type combining these. The case body of the airbag device 10 is attached to the vehicle body side member via a bracket (not shown).

  When the automobile equipped with the airbag device 10 collides, the air bag 17 is inflated by the gas supplied from the inflator, and the inflation pressure breaks the cover 18 so that the air bag 17 is inflated. The airbag 17 projects upward as a predetermined direction, and the airbag 17 inflates and deploys in front of the occupant. Hereinafter, the predetermined direction which is the bulging side of the air bag 17, that is, the occupant side is the upper side (the direction of arrow A shown in FIG. 1), the front side or the surface side, and the opposite side of the bulging side is the lower side (FIG. 1 The description will be made on the back side or the back side in the direction of arrow B). Further, although the front and back direction and both sides in a state in which the airbag apparatus 10 is attached to an automobile will be described as the front and rear direction and both sides, the attachment state of the airbag apparatus 10 is not limited to this configuration. It can also be mounted with the side facing back upwards or backwards.

  The cover 18 is also called an airbag grid or a lid, and as shown in FIG. 3, integrally includes a cover main body 21 and a skin 22 attached to the cover main body 21. A so-called seamless lid or an interior member called a seamless instrument panel, which is integrally formed with the instrument panel section 12 (FIG. 1), which is an interior panel of the present invention.

  The cover main body 21 shown in FIGS. 1 (a) to 1 (c) is formed of a single member or a plurality of members made of synthetic resin or the like, and includes a facing portion 25 which constitutes a part of the instrument panel portion 12. The mounting portion 26 is provided integrally with the facing portion 25 and to which the hook of the case body is attached.

  The facing portion 25 is also called a lid portion and covers the stored air bag 17 and is exposed to the outside from the opening portion 13 of the instrument panel portion 12 and elongated in the vehicle width direction at the front of the vehicle compartment The whole is formed in a substantially plate shape. The outer edge portion facing the inner edge portion of the opening 13 of the facing portion 25 has a rectangular shape in the present embodiment. Further, the opposing portion 25 has a tear line 31 as a fragile portion, and a tear line 31 as a weak portion on the back side, ie, the back side, which is the side opposite to the airbag 17, substantially facing the case opening of the upper portion of the case. Ribs 32 and 32 as convex portions positioned on both sides of 31 are formed, and portions divided by the tear line 31 form a pair of front and rear door scheduled portions 34 and 34. The outer side, that is, the portion surrounding the scheduled door portion 34, 34 is an outer shell portion 36 which is a non-expanded portion. Further, a storage portion 38 which is a groove portion for storing a part of the skin 22 is formed in the facing portion 25 on the surface side opposite to the side facing the air bag 17.

  The tear line 31 is a thin portion which can also be called a tear, a tear groove, a portion to be fractured, a groove to be cut, a line to line the door or a broken portion, which is more fragile than the portions 34 and 34 and the shell 36 and can be broken It is a weak part that is easy to deform. The tear line 31 can be formed into any shape as long as the airbag 17 can be expanded with a desired expansion characteristic. However, in the present embodiment, as shown in FIG. An end division line as a first straight portion 31a extending longitudinally linearly along the vehicle width direction, and a second tearing portion extending linearly in the front-rear direction at both ends of the straight portion 31a It has a substantially H shape having the portions 31 b and 31 b. The straight portion 31 a which is a part of the tear line 31 is located on the back side of the storage portion 38. Further, the end parting line parts 31 b and 31 b which are the other parts of the tear line 31 are formed along the vicinity of the inner edge of the mounting piece part 26. That is, on the rear surface side of the storage portion 38, the end division line portions 31b and 31b extend in a direction crossing (orthogonal to) the storage portion 38. And this tear line 31 is shape | molded by the shape of the cavity of a metal mold at the time of injection molding.

  The ribs 32, 32 shown in FIG. 1 serve as a butting portion against which the upper portion of the air bag 17 is abutted when the air bag 17 is inflated and deployed, and also reinforce the opposing portion 25. As shown in FIG. 4, the ribs 32 and 32 are continuously formed linearly along the front and rear sides of the linear portion 31 a of the tear line 31. The ribs 32 and 32 are located on the back side of the storage portion 38. That is, these ribs 32, 32 extend linearly along the left-right direction, and are spaced apart from each other at substantially equal intervals. Further, the ribs 32 and 32 are positioned inward of the mounting piece portion 26 and do not extend outward of the mounting piece portion 26. Furthermore, as shown in FIG. 1, these ribs 32 and 32 have a lower outer shell facing the air bag 17 on the first inclined surface 41 as a tear line side surface forming the side surface of the tear line 31 and the opposing portion 25. The second inclined surface portion 42 as a continuous inclined portion and the continuous portion 43 which is a projecting portion connecting the first inclined surface portion 41 and the second inclined surface portion 42 are formed.

  The first inclined surface portion 41 is inclined upward away from the air bag 17 from the continuous portion 43 (the second inclined surface portion 42 side) toward the center position of the tear line 31, that is, the end of the planned door portion 34. doing. Further, the inclination angle of the first inclined surface portion 41 with respect to the normal direction of the facing portion 25 is set to a predetermined angle, for example, 21.5 °. Therefore, the tear line 31 is a groove having a triangular cross section that opens downward at an acute angle, and in the present embodiment, the opening angle θ1 of the tear line 31 is a predetermined angle, for example 43 ° (FIG. 2). ).

  The second inclined surface portion 42 is a back surface of the facing portion 25 which is separated from the continuous portion 43 in the opposite direction to the first inclined surface portion 41, that is, the tear line 31 from the continuous portion 43 (the first inclined surface portion 41 side). Are inclined upward and spaced apart with respect to the air bag 17. The inclination angle θ2 of the second inclined surface portion 42 with respect to the back surface of the facing portion 25 is a predetermined angle, for example, 159 ° (FIG. 2).

  The continuous portion 43 is a top portion of the rib 32, that is, a portion protruding to the lowermost side (the air bag 17 side) with respect to the facing portion 25. The continuous portion 43 connects the first inclined surface portion 41 and the second inclined surface portion 42 in an arc shape. Therefore, each rib 32 is curved without being pointed at the top facing the air bag 17.

  Further, the door planned portions 34, 34 cover the bulging side of the air bag 17 folded and stored normally, and when bulging the air bag 17, the portions constituting the door portions 45, 45 (FIG. 1C) It is. The planned doors 34, 34 (doors 45, 45) can have any shape as long as the airbag 17 can be expanded with a desired expansion characteristic. However, in the present embodiment, each of the doors is divided by the tear line 31 It is formed in a square shape.

  The outer shell portion 36 is held by the instrument panel portion 12 without expanding even when the air bag 17 is inflated, thereby concentrating stress on the tear line 31 to assist the expansion of the door portions 45, 45. In this embodiment, the frame 34 has a quadrangular frame shape surrounding the door planner 34. Further, on the back surface side which is the back surface side of the outer shell portion 36, a plurality of locking convex portions 47 for locking the cover body 18 to the instrument panel portion 12 are provided in a projecting manner. The locking projections 47 are inserted into locking holes (not shown) provided at the inner edge of the opening 13 of the instrument panel 12.

  The storage portion 38 is recessed in the surface of the facing portion 25 in a groove shape. The storage portion 38 is formed in a rectangular shape in cross section, and is provided along a position corresponding to the straight portion 31 a of the tear line 31. That is, the ribs 32, 32 are disposed on the back surface of the facing portion 25 at positions corresponding to both sides of the storage portion 38. In the present embodiment, the storage portion 38 is formed longitudinally along the left-right direction. Further, the storage portion 38 is continuous over the entire left and right direction which is the longitudinal direction of the facing portion 25. Therefore, the storage portion 38 is positioned over the extension of the straight portion 31 a of the tear line 31. In other words, the storage portion 38 is continuous not only at the positions of the scheduled door portions 34 and 34 of the facing portion 25 but also across the outer shell 36 (FIG. 3).

  The mounting piece portion 26 can also be called a standing wall or a vertical wall for mounting a retainer, and is formed in, for example, a square cylindrical shape surrounding the tear line 31. Then, as shown in FIG. 3, a plurality of mounting holes 49 which are mounting portions and which are square-shaped rectangular holes are respectively formed in the front and back facing surface portions of the mounting piece portion 26 which are longitudinal. The hook provided on the case body is locked, and the cover body 18 and the case body are connected.

  The skin 22 covers the surface side of the facing portion 25 to improve the appearance and touch, and is formed, for example, in the form of a square sheet of natural leather, artificial leather, soft resin or the like. In the present embodiment, the skin 22 is provided with one skin member 51, which is a skin member, and another skin member 52, which is a skin member. The one and the other skin members 51 and 52 may be made of the same material, or may be made of different materials. One skin member 51 covers the entire front side of the facing portion 25 which is one side of the straight portion 31 a of the tear line 31. The other skin member 52 covers the entire rear side of the opposing portion 25 which is the other side of the straight portion 31 a of the tear line 31. Furthermore, as shown in FIG. 1A, the one and the other skin members 51 and 52 have one and the other of which the positions of mutually opposing edges are joined together along the position of the straight portion 31a of the tear line 31. It has become the turning parts 53 and 54 of. The one and the other folded parts 53 and 54 are one and the other winding parts which are folded and overlapped on the surface of the facing part 25 which is the back side of the one and the other skin members 51 and 52. Further, in the present embodiment, the one and the other folded back portions 53 and 54 are joined to each other via a sewn portion 56 which is a joining portion straddling the straight portion 31 a of the tear line 31. Furthermore, the one and the other folded back portions 53 and 54 are stored in the storage portion 38. For this reason, the skin 22 does not project upward at the positions of the one and the other skin members 51 and 52 and the other folded portions 53 and 54, and is substantially flush over the whole. The skin 22 (one and the other skin members 51 and 52) may be insert-molded integrally with, for example, the cover main body 21 or may be attached to the separately molded cover main body 21 in a post process. .

  The sewn portion 56 is provided so as to be breakable by the inflation pressure of the air bag 17 which causes the tear line 31 to break. The sewn portion 56 is housed in the storage portion 38, and is located above (directly above) the straight portion 31a of the tear line 31 along the front-back direction intersecting (orthogonal) with the straight portion 31a, It is arranged across the section 31a.

  Then, the air bag device 10 operates from the state shown in FIG. 1A, and when the gas is injected from the inflator to the air bag 17 and the air bag 17 expands or expands, the air bag 17 expands in the case. The inflating pressure contacts the continuous portions 43 and 43 of the ribs 32 and 32 projecting downward with respect to the opposing portion 25 and pushes up the planned door portions 34 and 34 of the opposing portion 25, whereby the airbag 17 is The expansion pressure acts to bulge and deform the planned door portions 34 and 34 of the facing portion 25 so as to gradually expand from both sides to the central portion. Therefore, as shown in FIG. 1B, the first inclined surface portions 41, 41 of the ribs 32, 32 which are both side surfaces of the tear line 31 abut each other, and the second inclined surface portions 42, 42 of the ribs 32, 32 substantially Continuously, along with the back surface side (airbag 17 side) of the facing portion 25, a flat or curved gentle surface S along the surface of the airbag 17 is formed, and the position along the straight portion 31 a of the tear line 31 In one and the other skin members 51 and 52, in the one and the other folded portions 53 and 54, stress concentrates on the sewn part 56 straddling the straight part 31a, and the sewn part 31 a of the tear line 31 is broken by the notch effect. The part 56 starts breaking. Then, the sewn portion 56 is fractured as the entire tear line 31 is broken, and the one and the other skin members 51, 52 are separated at positions excluding the one and the other end portions of the one and the other folded portions 53, 54. 34 are separated at the position of the tear line 31 (the straight portion 31a and the end dividing line portions 31b, 31b) to form the door portions 45, 45, and these door portions 45, 45 rotate or expand (see FIG. c) and FIG. 6), the air bag 17 bulges.

  As described above, according to the present embodiment, the surfaces S along the surface of the air bag 17 by the ribs 32, 32 in contact with the inflated air bag 17 due to the deformation of the facing portion 25 (the door planned portions 34, 34) To effectively transmit the inflation pressure of the air bag 17 to the tear line 31 (straight line portion 31a) without applying a large load to the air bag 17, for example, to the air bag 17 to reinforce the load from the ribs 32, 32. The tear line 31 can be efficiently cleaved while suppressing the cost increase such as applying, and suppressing the load applied to the air bag 17 from the ribs 32, 32 and the hooking of the ribs 32, 32 on the air bag 17.

  That is, in the case of a convex portion which is made to simply project toward the air bag 17 on the back side of the facing portion 25, when the inflated air bag 17 contacts the convex portion, a large load is applied to the surface of the air bag 17 from the convex portion. In the present embodiment, since the ribs 32, 32 form the surface S along the surface of the airbag 17, this load is not easily applied.

  Specifically, each rib 32 is moved from the side of the air bag 17 of the opposing portion 25 to the side of the tear line 31 (straight line portion 31 a), and the first inclined surface 41 forming the side surface of the grooved tear line 31 (straight line portion 31 a). It is configured to include the second inclined surface portion 42 inclined so as to gradually protrude, and the inflation and deployment of the air bag 17 deforms the facing portion 25 (the planned door portions 34 and 34) and the first inclined surface portion 41 abuts When the ribs 32 are in contact with the inflated air bag 17 by the second inclined surface portion 42 becoming a surface S along the surface of the air bag 17, a large load is applied to the air bag 17 from the ribs 32. The inflation pressure of the air bag 17 can be effectively transmitted to the tear line 31 without being applied.

  In addition, each rib 32 expands as compared with the case where the continuous portion 43 has a sharp shape by making the continuous portion 43 where the first inclined surface portion 41 and the second inclined surface portion 42 continue to be arc-shaped. It is possible to further reduce the load applied to the air bag 17 when contacting the air bag 17.

  Furthermore, the storage portion 38 for storing the folded back portions 53 and 54 of the skin members 51 and 52 of the skin body 22 is a tear line on the surface side opposite to the back surface side facing the airbag 17 of the opposite portion 25. 31 is recessed along the position corresponding to the linear portion 31a, and the pair of ribs 32, 32 are disposed at positions corresponding to both sides of the storage portion 38 on the back surface side facing the airbag 17 of the opposing portion 25 Thus, the facing portion 25 can be covered with the skin 22 in a substantially planar shape and can be covered with good appearance without swelling on the surface side at the position of the folded back portions 53 and 54. And the thermal deformation of the facing portion 25 can be suppressed.

  In the embodiment described above, the number of skin members is not limited to two, and three or more can also be used.

  Further, it can also be used as a cover of an air bag apparatus for a driver's seat or a cover of a knee air bag apparatus.

  The present invention can be suitably used, for example, as an air bag apparatus for a passenger seat.

10 Airbag device
17 Airbag
18 cover body
22 epidermal body
25 opposite part
31 Tea line
32 Rib as a convex part
38 Storage section
41 First inclined surface as tear line side surface
42 2nd inclined surface part as inclined part
45 door
51 One skin member which is a skin member
52 Other skin member S surface that is a skin member

Claims (2)

An opposing portion covering the stored air bag,
A groove-like tear line which is provided on the side facing the air bag of the opposite portion, which divides the opposite portion, and which is split at the time of inflation and deployment of the air bag to form a door portion;
It comprises both sides of at least a part of the tear line, and has a pair of convex portions provided on the side of the opposing portion facing the air bag,
The convex portion forming the pair is inclined so as to gradually project from the side of the air bag of the opposing portion toward the side of the tear line, and a side surface of the tear line that constitutes the side surface of the groove-like tear line. And an inclined portion which is a surface along the surface of the airbag in a state where the opposite portion is deformed by inflation and deployment and the tear line side surface portion abuts, and the tear portion is broken when the airbag is inflated and deployed. A cover body of an air bag device, which forms a surface along the surface of the air bag by deformation . An outer skin body including a plurality of skin members joined to each other at an end portion and covering at least a part of the opposite side to the side opposite to the side facing the airbag;
A storage section is provided along the position corresponding to at least a part of the tear line on the side opposite to the side opposite to the side facing the air bag of the facing portion, and stores the mutually joined ends of the skin members of the skin body. Have a department,
Protrusions paired, the cover of claim 1 Symbol placement of the air bag device, characterized in that on the side facing the airbag of the facing portions are disposed at positions corresponding to both sides of the housing part body.

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