JP2007022482A - Instrument panel for vehicle and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument panel for a vehicle and its manufacturing method capable of preventing depression of a door part by external force and maintaining deployment property of a door part well even if a tear line position is deviated. <P>SOLUTION: In the instrument panel 1 for the vehicle, a lid part 22 of a case 21 of an airbag device 20 is contacted/mounted, the frame-like tear lines 12a, 13e, 22c are provided on a base material layer 13', a skin layer 12' and the lid part 22 of the case 21 of the airbag device 20 respectively and inner sides of the tear lines 12a, 13e, 22c are made to a door part 11a for airbag deployment. These tear lines 12a, 13e, 22c are provided such that the tear line 13e of the base material layer 13' is positioned at the inner side of the tear line 12a of the skin layer 12' and the tear line 22c of the lid part 22 is positioned at the inner side of the tear line 13e of the base material layer 13'. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle instrument in which an outer surface side is a skin layer, an inner surface side is a base material layer, and a lid portion of an airbag device case is attached to a surface of the base material layer on the side opposite to the skin layer. The present invention relates to a vehicle interior technology field.

  A vehicle may be provided with an airbag device inside the instrument panel for the purpose of protecting passengers in the event of a collision with an obstacle. In this case, the instrument is installed so that the airbag can be deployed in the vehicle interior. The instrument panel is provided with a door part that can be opened to the passenger compartment side by the deployment pressure of the airbag. For example, in Patent Document 1, the door part is provided with an instrument so as not to impair the appearance of the instrument panel. What is formed integrally with the panel is disclosed.

  That is, the instrument panel 110 according to Patent Document 1 includes a skin layer 111 and a base material layer 112 that constitute an outer surface and an inner surface, as shown in FIG. 15, and these layers 111 and 112 are adhesive layers 113. It is adhered by. The base material layer 112 is provided with a rectangular opening 112a for releasing an airbag, and a step 112b is provided around the opening 112a. In addition, a lid member 114 having a slightly smaller shape than the opening 112a is fitted into the opening 112a, and one side 114a thereof is fixed to the step 112b together with the flange 120a of the airbag case 120 with a bolt 131 and a nut 132. Thus, the one side 114a side is configured as a hinge. Further, on the surface of the skin layer 111 on the side of the adhesive layer 113, a side portion 114b facing the one side portion 114a of the lid member 114 and a tear line 111a are provided inside the side portions on both sides of the side portion 114b. The lower portion of the tear line 111a is a planned fracture portion T of the adhesive layer 113, and a door portion 110a is formed by the inner portion of the tear line 111a and the planned fracture portion T and the lid member 114. When the airbag 121 is deployed, the lid member 114 is pressed by the airbag 121, and the tear line 111a of the skin layer 111 and the planned fracture portion T of the adhesive layer 113 located immediately below the fracture are broken, and the door The part 110a is configured to open around the one side part 114a.

  On the other hand, for example, the instrument panel 140 shown in FIG. 16 has a skin layer 141, a base material layer 142, and an adhesive layer 143 over almost the entire surface. A lid 144 of the case of the airbag device is attached to the base material layer 142 using a structural adhesive 145. Each of these layers 141 to 144 is provided with square-shaped tear lines 141a to 144a at the same position, and the inside of these tear lines 141a to 144a is a door portion 140a that can be opened when the airbag is deployed.

Japanese Patent Laid-Open No. 10-024792

  By the way, in the instrument panel 110 described in Patent Document 1, since the tear line 111a of the skin layer 111 is provided inside the side portion 114b of the lid member 114, the side portion 114b is opened when the door portion 110a is opened. However, it catches on the peripheral part (outer part of the tear line 111a) of the door part 110a in the skin layer 111, and it is difficult to obtain favorable openness. Further, when the door portion 110a is opened, the adhesive layer 113 above the side portion 114b of the lid member 114 is compressed with the skin layer 111 to cause cohesive failure, and fragments of the adhesive layer 113 that have caused the cohesive failure. However, there is a risk of scattering to the outside.

  On the other hand, in the one shown in FIG. 16, since the tear lines 141a to 144a are provided at the same positions of the layers 141 to 144, the door portion 140a inside the tear lines 141a to 144a is provided as in Patent Document 1. There will be no problems such as scattering due to cohesive failure of the adhesive layer 143 at the time of opening, or a catch on the skin layer 141, but if an external force is applied from the skin layer 141 side, the door portion 140a may sink. Further, the instrument panel 140, for example, injects an adhesive into a space between the skin layer 141 and the base material layer 142 in which the tear lines 141a and 142a are formed in advance and set in the upper mold and the lower mold. However, if the positions of the tear layer 141a and 142a of the set skin layer 141 and the base material layer 142 are shifted due to an error at the time of formation, the skin layer 141 of the manufactured instrument panel 140 The positions of the tear line 141a and the tear line 142a of the base material layer 142 do not coincide with each other, and the same problem as that described in Patent Document 1 may occur. Further, since the misalignment of the tear line can also occur when the airbag case is attached to the instrument panel 140, there is a similar problem in this case.

  Therefore, the present invention provides an instrument panel for a vehicle and a method for manufacturing the same that can prevent the door portion from collapsing due to an external force and can maintain the deployability of the door portion even when the tear line position is shifted. The issue is to provide.

  In order to solve the above-described problems, the present invention is configured as follows.

  First, in the invention described in claim 1 of the present application, the outer surface side is a skin layer, the inner surface side is a base material layer, and the lid portion of the case of the airbag device is on the surface of the base material layer on the side opposite to the skin layer. The base material layer, the skin layer, and the lid of the case of the airbag device are each provided with a frame-like tear line, and the inside of the tear line is for airbag deployment. The vehicle instrument panel is a door part of the vehicle, and these tear lines are located on the inner side of the tear line of the skin layer and the lid part on the inner side of the tear line of the base layer. The tier line is provided so as to be located.

  The invention according to claim 2 is the invention according to claim 1, wherein the distance between the tear line of the skin layer and the tear line of the base material layer is the same as the tear line of the base material layer and the airbag device. It is characterized by being made smaller than the distance between the lid portion of the case and the tear line.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the door portion has a rectangular shape, and one of the side portions forms a hinge. And the distance between at least the skin layer and the tear line of the base material layer among the tear lines of the side portions facing the one side portion is based on the skin layer and the base layer on the side portions on both sides of the one side portion. It is characterized by being made smaller than the interval between the tear lines of the material layer.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein an adhesive layer is provided between the base material layer and the skin layer to adhere both. In addition, the adhesive layer is provided with a tear line at the same position as the base material layer.

  Furthermore, in the invention of claim 5, in the invention of claim 4, the tear line of the skin layer is formed by a continuous groove provided on the base material layer side, and the base material layer and The tear line of the adhesive layer is formed by intermittent slits.

  In the invention according to claim 6, the outer surface side is a skin layer, the inner surface side is a base material layer, and the lid portion of the case of the airbag device is in contact with the surface of the base material layer on the side opposite to the skin layer. The base material layer, the skin layer, and the lid of the case of the airbag device are each provided with a frame-like tear line, and the inside of the tear line is an airbag deployment door. A method for manufacturing an instrument panel of a vehicle, wherein the tear line of the base material is located inside the tear line of the skin, and the inner side of the tear line of the base material, as the skin, the base material, and the lid part. Is provided so that the tear line of the lid portion is located, and the distance between the tear line of the skin and the tear line of the base material is the distance between the tear line of the base material and the tear line of the lid portion of the case of the airbag device. Has been smaller than A plurality of partition portions that are higher than the thickness of the base material at least on the inner surface corresponding to the slits forming the tear line of the base material. First, in one of the molds, the base material is set with the slits penetrating the partition part, and the other mold is set with a skin material, Both molds are clamped and an adhesive is injected into the space between the base material and the skin material. After the adhesive is cured, the mold is opened, and the molded product of the instrument panel body is taken out. A lid portion of the case of the airbag device is attached to the surface on the side opposite to the skin layer on the base material layer side.

  Next, the effect of the present invention will be described.

  First, according to the first aspect of the present invention, the tear line has the tear line of the base material layer located inside the tear line of the skin layer, and the tear line of the lid portion inside the tear line of the base material layer. Even if an external force is applied from the skin layer side, the external force is applied to the peripheral part of the door layer component part (inner part of the tear line of the skin layer) and the base material layer. Due to the overlap with the peripheral part of the door part (the outer part of the tear line of the base material layer), the peripheral part of the door part of the base material layer (the outer part of the tear line of the base material layer), and the door part of the lid part It is received by overlapping with the peripheral portion (the outer portion of the tear line of the lid portion), and the door portion is prevented from being depressed.

  In addition, when the door part is opened, the door part constituent part of the lid part and the door part constituent part of the base material layer will not be rubbed or caught on the peripheral part of the door part of the skin layer side. The deployability of the door part is good. Also, for example, even when an adhesive layer is provided between the base material layer and the skin layer, the adhesive layer is not compressed at the peripheral portion of the door portion of the skin layer, and the adhesive layer It is also possible to prevent cohesive failure and scattering of the broken adhesive layer due to this.

  In addition, if the interval between the tear lines is set appropriately, even if a dimensional error occurs in the formation position of the tear layer of the base material layer, the skin layer, and the lid, the base material is placed inside the tear line of the skin layer. The layer tear line is located, and the relationship in which the tear line of the lid portion is located inside the tear line of the base material layer is maintained, and the above-described effect is achieved.

  By the way, if the gap between the tear line of the skin layer and the tear line of the base material layer is larger than necessary, in other words, the overlap of the door part of the skin layer and the peripheral part of the door part of the base material layer is more than necessary. If it is large, the base material layer is pressed by the skin layer, and the openability of the door may be deteriorated. In addition, if the gap between the tear line of the base material layer and the tear line of the lid portion is too small, the door portion constituting portion of the lid portion is configured as the door portion constitution of the base layer when the airbag device is attached to the instrument panel. It may be difficult to attach to the part and may not fit.

  However, according to the invention of claim 2, the distance between the tear line of the skin layer and the tear line of the base material layer is such that the tear line of the base material layer and the tear line of the lid portion of the case of the airbag device Since the distance between the tear line of the skin layer and the tear line of the base material layer is relatively small, it is possible to improve the opening of the door portion. In addition, since the gap between the tear line of the base material layer and the tear line of the lid portion of the case of the airbag device is relatively large, there is a slight displacement when the airbag device case is attached to the instrument panel body. However, it becomes easy to attach the door part component part of a cover part to the door part component part of a base material.

  According to the invention described in claim 3, the door portion has a rectangular shape, and a tear line is provided so that any one side portion constitutes a hinge, and is opposed to the one side portion. The distance between at least the skin layer and the base material layer among the tear lines of each side is smaller than the distance between the skin layer and the base material layer at both sides of the one side. Therefore, when the airbag is deployed, it starts to break from the tear line of the side facing the one side, and then the sides on both sides of the side start to break. Therefore, the door part opens favorably.

  And according to invention of Claim 4, while the adhesive bond layer which adhere | attaches both is provided between the said base material layer and skin layer, this adhesive layer is the same as a base material layer. Since the tear line is provided at the position, the adhesive layer is not compressed at the door portion peripheral portion of the layer on the skin layer side when the door portion is opened, and the adhesive layer is coherently broken. Scattering around the broken adhesive layer can also be prevented.

  By the way, if each tier line is made intermittent, it is possible to surely resist the external force applied to the door part, but the openability of the door part is sacrificed. On the other hand, if each tear line is continuous, the openability of the door portion is good, but it is vulnerable to external force applied to the door portion.

  However, according to the invention described in claim 5, the tear line of the skin layer is formed by a continuous groove provided on the base material layer side, and the tear line of the base material layer and the adhesive layer is intermittent. Since it is formed with slits, it can better resist the external force applied to the door part by the base material layer and the adhesive layer, and the skin layer will be smoothly broken when the airbag is deployed, The openability of the door portion is further improved.

  Further, according to the invention described in claim 6, as the skin, the base material, and the lid portion, the tear line of the base material is located inside the tear line of the skin, and the lid portion is located inside the tear line of the base material. The tear line is located so that the distance between the skin tear line and the base material tear line is smaller than the distance between the base material tear line and the tear line of the lid of the case of the airbag device. And one of the molds for joining the skin and the base material has a plurality of at least higher than the thickness of the base material corresponding to the slits constituting the tear line of the base material on the inner surface. Using the one with the partition part standing upright, first, while setting the base material in the state where the slit penetrates the partition part, the skin material is set in the other mold, Then tighten both molds and Adhesive is injected into the space between the skin and the skin material, and after the adhesive is cured, the mold is opened, the molded product of the instrument panel body is taken out, and the anti-skin layer side on the base material layer side of the molded product An instrument panel is manufactured by attaching the lid portion of the case of the airbag device to the surface.

  In addition, an instrument panel having a tear line in the adhesive layer can be easily manufactured only by positioning the partition portion in the space between the base material layer and the skin layer in a clamped state. Also, in that case, if the height of the partitioning part is set to a length that makes the tip abut on the surface of the skin layer on the base material layer side when clamping, a slit-like tear line penetrating the base material layer can be easily formed. Can be molded.

  First, the instrument panel 1 which concerns on embodiment of this invention is demonstrated. As shown in FIG. 1, the instrument panel 1 is disposed in a front passenger seat in a left-hand drive specification vehicle, and includes an instrument panel main body 11 (hereinafter simply referred to as “panel main body 11”), As shown in FIG. 2, the panel body 11 includes a case 21 of the airbag device 20 attached to the surface of the panel body 11 on the side opposite to the passenger compartment.

  As shown in FIG. 2, the panel body 11 includes a skin layer 12 ′ composed of a skin material 12 constituting the front surface side (side facing the passenger compartment) of the panel body 11 and a base material 13 constituting the back surface side. And a cured layer 14 ′ of an adhesive 14 (not shown in the figure, but provided for convenience of explanation) for bonding the skin material 12 and the base material 13. It is comprised with the laminated body which becomes. As shown in FIG. 3, the skin layer 12 'includes a skin layer 15' constituting the surface and a foam layer 16 'made of a foam material having cushioning properties. In addition, as the skin material 12, what was previously shape | molded by the well-known powder slush molding and the base material 13 by the well-known injection molding in the shape of an instrument panel, respectively is used. The layer 14 'in which the adhesive 14 is cured is formed by cooling and curing a molten hot melt adhesive. The skin material 12, the base material 13, and the adhesive 14 are unified with a polypropylene material in order to facilitate recycling.

  As shown in FIG. 1, the base material 13 as a material is provided with four nozzle insertion holes 13a, 13b, 13c, 13d through which nozzles 41, 51, 61, 71 described later are inserted. The adhesive 14 is also filled in the nozzle insertion holes 13a to 13d at the time of molding.

  Here, as shown in FIG. 3, the lid portion 22 of the case 21 of the airbag device 20 is bonded to the base material layer 13 ′ via the structural adhesive layer 19 ′. As shown in FIG. 1, the lid portion 22 is provided with a rectangular opening 22a for releasing an airbag in a frame 22d for housing the airbag device 20, and the opening 22a includes the opening 22a. A cover member 22b slightly smaller than the opening 22a is disposed, and a flange 22f is disposed on the outer periphery of the frame body 22d. The cover member 22b and the flange 22f are attached to the base material layer 13 'by the structural adhesive 19 ( The reference numerals are not shown in the figure, but are attached for convenience of explanation). Here, the edge portion of the opening 22a and the edge portion of the lid member 22b are connected by a flexible connecting portion 22e having an upper side portion having a substantially U-shaped cross section, and a gap provided on the other side is a lid. A tier line 22c of the portion 22 is configured.

  The layers 12 ', 13' and 14 'of the panel body 1 are provided with tear lines 12a, 13e and 14a at positions where the case 21 of the airbag device 20 is disposed. The inner portions of the tear lines 12a, 13e, 14a, and 22c constitute the door portion 11a of the panel body 11.

  As shown in FIGS. 1, 3, and 5, the tear line 12 a of the skin layer 12 ′ is provided on a side portion other than the upper side portion, and is configured by a continuous V-shaped groove. Further, the tear lines 13e, 14a of the base material layer 13 'and the adhesive layer 14' are provided at the same position in the surface direction on all sides, and are intermittent slits 13s, 13s, 14s, ... having connecting portions in the middle. 14 s.

  In this case, as shown in FIG. 1, the tear lines 12a, 13e, and 14a are located on the inner side of the tear line 12a of the skin layer 12 ', and the tear line 13e of the base layer 13' is located on the inner side of the base layer 13 '. It is provided so that the tear line 22c of the cover part 22 may be located inside the tear line 13e. Therefore, the peripheral portion of the inner portion of the tear line 12a in the skin layer 12 '(the door portion constituting portion in the skin layer 12') is the outer portion of the tear line 13e in the base material layer 13 '(the door portion in the base material layer 13'). The peripheral portion of the inner portion of the tear line 13e in the base material layer 13 '(the door portion constituting portion in the base material layer 13') overlaps with the outer portion (flange 22f) of the tear line 22c in the lid portion 22. overlapping.

  The distances L1 and L2 between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' are as shown in FIGS. 1, 3, and 5, as shown in FIGS. And the distance M between the lid portion 22 of the case 21 and the tear line 22c.

  Further, the distance L2 between the tear layers 12a and 13e of the skin layer 12 'and the base material layer 13' in the lower side portion is equal to the tear lines 12a and 13e of the skin layer 12 'and the base material layer 13' in the left side portion and the right side portion. The interval is smaller than L1.

  Further, as described above, the upper side portion is not provided with the tear line of the skin layer 12 ′, and is configured as the hinge portion 11 b of the door portion 11 a together with the flexible connection portion 22 e of the case 21.

  Next, the molding apparatus 30 for the instrument panel 1 will be described.

  As shown in FIG. 6, the molding device 30 is supported by a drive means (not shown) so as to be movable in the vertical direction and is fixed to a movable upper die 31 on which a base material 13 is set and a support member (not shown). It has a pair of molds with a lower mold 32 on the fixed side on which the skin material 12 is set.

  A plurality of adhesive injection devices 40 that inject the adhesive 14 into the space X (see FIGS. 9 and 10) formed between the skin material 12 and the base material 13 by clamping the mold on the outer surface of the upper mold 31. , 50, 60, 70 (see FIG. 7) are attached via brackets 33.

  As shown in FIG. 6, the adhesive injection device 50 controls a nozzle 51 slidably inserted into a nozzle insertion hole 31 a provided in the upper mold 31 and supply of the adhesive 14 to the nozzle 51. It has an applicator 52, a nozzle lifting mechanism 53 that lifts and lowers the nozzle 51 and the applicator 52, and an adhesive tank 44 (see FIG. 7). As shown in FIG. 7, the applicator 52 includes a pump 52a that transfers the adhesive 14 in the adhesive tank 44 to the nozzle 51 side, and an electromagnetic valve 52b that controls the supply of the adhesive 14 to the nozzle 51 side. It is configured. The nozzle raising / lowering mechanism 53 is composed of an air cylinder. In addition, you may comprise this raising / lowering mechanism 53 using a hydraulic cylinder, an electric motor, etc. FIG. The other adhesive injection devices 40, 60, and 70 have the same configuration as the adhesive injection device 50, and a description thereof will be omitted.

  A plurality of partition plates 34... 34 are erected on the inner surface of the upper die 31 at positions corresponding to the slits 13 s.

  As shown in FIG. 7, the molding apparatus 30 has a controller 100, which is a pump 42 a, 52 a, 62 a of an applicator 42, 52, 62, 72 of an adhesive injection device 40, 50, 60, 70. 72a and solenoid valves 42b, 52b, 62b, 72b to control the supply of the adhesive 14 to the nozzles 41, 51, 61, 71 and the nozzle lifting mechanisms 43, 53, 63, 73 The nozzles 41, 51, 61, 71 and the applicators 42, 52, 62, 72 are moved up and down. The controller 100 is connected to a start switch for starting the operation of the adhesive injection devices 40, 50, 60 and 70.

  Next, a method for manufacturing the instrument panel 1 will be described. In addition, as the skin material 12 and the base material 13, those in which the tear lines 12a and 13e are previously formed are used.

  First, the method of forming the panel body 11 will be described. As shown in FIGS. 6 and 8, the upper mold 31 and the lower mold 32 are opened, and the base material 13 is slit on the inner surface of the upper mold 31 and the slits 13s. While setting it in the state penetrated to board 34 ... 34, the skin material 12 is set to the inner surface of the lower mold | type 32. FIG.

  Next, as shown in FIG. 9, the upper die 31 and the lower die 32 are clamped. Here, the height N of the partition plates 34... 34 is set such that the tips 34 a of the partition plates 34... 34 abut against the inner surface of the skin material 12 when the mold is clamped as shown in FIG.

  Next, the start switch is turned on. Then, the controller 100 controls the adhesive injection devices 40, 50, 60, and 70 as follows.

  First, the controller 100 controls the lifting mechanisms 43, 53, 63, 73 of the adhesive injection devices 40, 50, 60, 70, and the nozzles 41, 51, 61, 71 and the applicators 42, 52, 62, 72. The nozzles 41, 51, 61, 71 are moved into the adhesive injection space X through the nozzle insertion holes 31 a... 31 a of the upper mold 31 and the nozzle insertion holes 13 a, 13 b, 13 c, 13 d of the base 13. Insert to a predetermined depth.

  Next, the controller 100 sequentially controls the applicators 42, 52, 62 and 72 to start supplying the adhesive 14. The injection period of the adhesive 14 is predetermined for each nozzle 41, 51, 61, 71 as shown in FIG. Specifically, the nozzle 41 is set from time t0 to time t3, the nozzle 51 is set from time t1 to time t5, the nozzle 61 is set from time t1 to time t4, and the nozzle 71 is set from time t3 to time t6. Yes. The purpose of this is to distribute the adhesive 14 almost evenly throughout the space while discharging the air in the adhesive injection space X to the outside of the space X.

  Next, when a predetermined time has elapsed after the completion of the injection of the adhesive 14 into the space X, the nozzle lifting mechanism 43, 53, 63, 73 of the adhesive injection device 40, 50, 60, 70 is controlled to control the nozzle 41. , 51, 61, 71 are raised and retreated in the nozzle insertion holes 31 a... 31 a of the upper die 31. The predetermined time is set to a time during which the adhesive 14 injected into the space X can be sufficiently solidified. Accordingly, the adhesive 14 is solidified in a state where the adhesive 14 does not reach the portion where the partition plates 34... 34 are located in the space X, and the base material layer 13 ′ is formed on the adhesive layer 14 ′ formed by solidification. The slits 14s... 14s are formed at the same positions as the slits 13s.

  Next, the operator opens the upper mold 31 and the lower mold 32 and removes the molded panel body 11.

  Next, the lid 22b of the case 21 is positioned on the inner side of the tear line 13e in the base material layer 13 'of the panel body 11, and the flange 22f of the case 21 is positioned on the outer side of the tear line 13e in the base material layer 13'. And affixed with the structural adhesive 19. As a result, the instrument panel 1 is manufactured.

  Next, test results for setting an appropriate value for the interval L will be described. The following results show an example of a large number of results. The conditions other than the distance L are as follows: the thickness of the skin layer 15 ′ of the skin layer 12 ′ is 0.6 mm, the remaining thickness between the bottom and the surface of the V-shaped groove of the skin layer 15 ′ is 0.5 mm, The thickness of the foam layer 16 'is 0.5mm, the thickness of the adhesive layer 14' is 1.0mm, the thickness of the base material layer 13 'is 2.5mm, the slits 3s of the base material layer 13' and the adhesive layer 14 ', The width of 4 s is 1 mm, and the temperature is 10 ° C. (−10 ° C.) below freezing point.

  First, in the first example shown in FIG. 12, the distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is 5.0 mm on the left side and 3.0 mm on the right side. In this case, the adhesive layer 14 'in the vicinity of the left side portion caused cohesive failure, and the left side portion of the lower side portion was broken outside the tear line 12a.

  In the second example shown in FIG. 13, the distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is 7.0 mm on the left side and 2.0 mm on the right side. In this case, the adhesive layer 14 'in the vicinity of the left side portion caused cohesive failure.

  In the third example shown in FIG. 14, the distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is 4.0 mm on the left side and 3.0 mm on the right side. In this case, the problem of cohesive failure and tearing outside the tear line did not occur.

  From these test results, the distance L between the tear line 12a of the skin layer 12 ′ and the tear line 13e of the base material layer 13 ′ is within the range of 3.5 mm + 0, −2.0 on the left side and the right side ( That is, it was found that the most preferable range is 1.5 mm to 3.5 mm) and the lower side is within the range of 1.5 mm + 0, −1.5 (that is, 0 mm to 1.5 mm).

  As described above, according to the present embodiment, the tear lines 12a, 13e, and 22c are positioned on the inner side of the tear line 12a of the skin layer 12 as shown in FIG. Since the tear line 22c of the lid portion 22 is provided inside the tear line 13e of the base material layer 13, even when an external force is applied from the skin layer 12 'side, this external force is applied to the skin layer 12 'And the peripheral portion of the door portion constituting portion (the inner portion of the tear line 12a of the skin layer 12') and the peripheral portion of the door portion of the base material layer 13 '(the outer portion of the tear line 13e of the base material layer 13') The overlap and the overlap of the peripheral portion of the door portion constituting portion of the base material layer 13 '(the outer portion of the tear line 13e of the base material layer 13') and the peripheral portion of the door portion of the lid portion 22 (flange 22f) are received. So that the depression of the door portion 11a is prevented.

  Further, when the door portion 11a is opened, the door portion constituting portion (the lid material 22b) of the lid portion 22 is not rubbed or caught on the peripheral portion of the door portion 11a in the skin layer 12 ′ and the base material layer 13 ′. As a result, the deployability of the door portion 11a is good. Even when the adhesive layer 14 ′ is provided between the base material layer 13 ′ and the skin layer 12 ′, the adhesive layer 14 ′ is compressed around the door portion of the skin layer 12 ′. Therefore, the cohesive failure of the adhesive layer 14 ′ and the scattering of the adhesive layer 14 ′ broken thereby can be prevented.

  Further, if the distances L (L1, L2) and M are set appropriately, there will be some dimensional error in the formation positions of the base layer 13 ', the skin layer 12', and the tear lines 13e, 12a and 22c of the lid portion 22. Even in this case, the tear line 13e of the base material layer 13 'is positioned inside the tear line 12a of the skin layer 12', and the tear line 22c of the lid portion 22 is positioned inside the tear line 13e of the base material layer 13 '. The relationship is maintained and the above effect is achieved.

  By the way, if the distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is larger than necessary, in other words, the door portion constituting part of the skin layer 2 'and the base material layer 3'. When the overlap with the peripheral portion of the door portion is large, the base material layer 13 ′ is pressed by the skin layer 12 ′, and the openability of the door portion 11 a may be deteriorated. Further, if the distance between the tear line 22c of the lid portion 22 and the tear line 13e of the base material layer 13 'is too small, the door portion constituting part of the case 21 is attached when the case 21 of the airbag device 20 is attached to the panel body 11. It is difficult to attach the (cover material 22b) to the door portion constituting portion of the base material layer 13 ', and there is a possibility that it will not fit.

  However, according to the present embodiment, the distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is equal to the tear line 13e of the base material layer 13 'and the airbag device 20. The distance L between the tear line 12a of the skin layer 12 'and the tear line 13e of the base material layer 13' is relatively smaller than the distance M between the lid portion 22 of the case 21 and the tear line 22c. Therefore, the opening of the door portion 11a can be improved, and the tear line 13e of the base material layer 13 'and the tear line 22c of the lid portion 22 of the case 21 of the airbag device 20 can be provided. Since the interval M is relatively large, even if a positional deviation occurs slightly when the airbag device 20 is attached to the panel body 11, it is based on the door portion constituting portion (the lid member 22 b) of the lid portion 22. It is well attached to the door structure portion of the layer 13 '.

  Further, the distance L2 between the tear layers 12a and 13e of the skin layer 12 'and the base material layer 13' in the lower side portion is equal to the tear lines 12a and 13e of the skin layer 12 'and the base material layer 13' in the left side portion and the right side portion. Since the distance is smaller than the interval L1, when the airbag is deployed, the tear lines 12a and 13e on the lower side start to break, and then the tear lines 12a and 13e on the left side and the right side start to break. . Therefore, the door part 11a will open favorably.

  Further, the tear line 12a of the skin layer 12 'is formed by a continuous groove provided on the surface of the base material layer 13', and the tear lines 13e of the base material layer 13 'and the adhesive layer 14', Since 14a is formed by the intermittent slits 13s, 13s, 14s, 14s, the substrate layer 13 'and the adhesive layer 14' can resist the external force applied to the door portion 11a, and the airbag. The skin layer 12 ′ is smoothly broken during the expansion of the door portion 11, so that the opening of the door portion 11 a is further improved.

  Further, according to the manufacturing method according to the present embodiment, the tear line 14a can be easily provided on the adhesive layer 14 ′ by simply positioning the partition plates 34... 34 in the adhesive injection space X with the mold clamped. The instrument panel 1 can be manufactured. In the present embodiment, the case 21 of the airbag device 20 is attached to the instrument panel main body 11 by adhesion using the structural adhesive 19, but may be vibration welded.

  Finally, correspondence between the constituent elements of the claims and the constituent elements of the embodiment will be described. It should be noted that those that are obvious from the explanation of the reference numerals and the like are excluded. First, the instrument panel corresponds to the instrument panel 1 and includes an instrument panel body 11 and a case 21 of the airbag device 20. The distance between the tear layer tear line and the base material layer tear line corresponds to the distance L (L1, L2) between the skin layer tear line and the base material layer tear line. The distance between the tear line and the tear line of the cover part corresponds to the distance M between the tear line of the base material layer and the tear line of the cover part.

  The present invention relates to a vehicle instrument in which an outer surface side is a skin layer, an inner surface side is a base material layer, and a lid portion of an airbag device case is attached to a surface of the base material layer on the side opposite to the skin layer. It can be widely applied to the ment panel.

It is a top view (surface side) of the instrument panel which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing of the manufacturing apparatus of the instrument panel which concerns on embodiment of this invention. It is a control block diagram of the manufacturing apparatus. It is explanatory drawing of the set of the base material and skin material to an upper mold | type and a lower mold | type. It is a figure which shows the mold clamping state of the manufacturing apparatus. It is an expanded sectional view of a tear line formation part in a mold clamping state. It is a time chart which shows the timing of adhesive agent injection from each nozzle. It is a figure which shows the result of the test for setting the suitable space | interval of the tear line of a skin layer, and the tear line of a base material layer (1st example). It is a figure which shows the result of the test for setting the suitable space | interval of the tear line of a skin layer, and the tear line of a base material layer (2nd example). It is a figure which shows the result of the test for setting the suitable space | interval of the tear line of a skin layer, and the tear line of a base material layer (3rd example). It is a figure which shows the 1st example of the instrument panel which concerns on a prior art. It is a figure which shows the 2nd example of the instrument panel which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument panel 11 Panel main body 11a Door part 12 Skin material 12 'Skin layer 12a Tier line 13 Base material 13' Base material layer 13e Tier line 13s ... 13s Slit 14 Adhesive 14 'Adhesive layer 14a Tier line 20 Airbag apparatus 22 Lid 31 Upper mold 32 Lower mold 34 ... 34 Partition (partition)
L, L1, L2 Distance between tear line tear line and base material layer tear line M Distance between base material layer tear line and lid tear line

Claims (6)

The outer surface side is a skin layer, the inner surface side is a base material layer, and the lid portion of the case of the airbag device is attached to the surface of the base material layer on the side opposite to the skin surface. Each of the layers and the lid portion of the case of the airbag device is provided with a frame-like tear line, and an inner side of the tear line is an instrument panel of a vehicle having a door portion for airbag deployment. And
These tear lines are provided so that the tear line of the base material layer is located inside the tear line of the skin layer, and the tear line of the lid portion is located inside the tear line of the base material layer. The instrument panel of the vehicle. An instrument panel for a vehicle according to claim 1,
The distance between the tear line of the skin layer and the tear line of the base material layer is smaller than the distance between the tear line of the base material layer and the tear line of the lid portion of the case of the airbag device. The instrument panel of the vehicle to be used. An instrument panel for a vehicle according to claim 1 or claim 2,
The door portion has a rectangular shape, and a tear line is provided so that any one side portion constitutes a hinge,
And the interval between the tear lines of at least the skin layer and the base material layer among the respective tear lines of the side parts facing the one side part is that of the tear line of the skin layer and the base material layer on the side parts on both sides of the one side part. An instrument panel for a vehicle, characterized in that it is smaller than the interval. An instrument panel for a vehicle according to any one of claims 1 to 3,
An adhesive layer is provided between the base material layer and the skin layer, and a tear line is provided at the same position as the base material layer. The instrument panel of the vehicle to be used. An instrument panel for a vehicle according to claim 4,
The tear line of the skin layer is formed by continuous grooves provided on the base material layer side,
A vehicle instrument panel, wherein a tear line of the base material layer and the adhesive layer is formed by intermittent slits. The outer surface side is a skin layer, the inner surface side is a base material layer, and the lid portion of the case of the airbag device is attached to the surface of the base material layer on the side opposite to the skin surface. Manufacturing of an instrument panel for a vehicle in which a frame-like tear line is provided on each of the layers and the lid portion of the case of the airbag device, and the inside of the tear line is a door portion for airbag deployment A method,
The skin, the base material, and the lid portion are provided so that the tear line of the base material is located inside the tear line of the epidermis and the tear line of the lid portion is located inside the tear line of the base material. The distance between the tear line and the tear line of the base material is smaller than the distance between the tear line of the base material and the tear line of the lid portion of the case of the airbag device,
In addition, one of the molds for joining the outer skin and the base material is provided with a plurality of partition portions standing on the inner surface corresponding to the slits constituting the tear line of the base material at least higher than the thickness of the base material. Use
First, the base material is set on the one mold in a state in which the slit penetrates the partition part, and the skin material is set on the other mold,
After that, both molds are clamped and an adhesive is injected into the space between the base material and the skin material,
After the adhesive is cured, open the mold, take out the molded product of the instrument panel body,
A method for manufacturing an instrument panel for a vehicle, comprising: attaching a lid portion of the case of the airbag device to a surface of the molded article on the side of the substrate layer on the substrate layer side.

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