JP5546314B2 - Resin molded product for vehicles with engaging part - Google Patents

Description

  The present invention relates to a resin molded product for a vehicle with an engagement portion in which an engagement portion such as a boss for use in connection with a mating member is integrally formed.

In a vehicle including the airbag device 82, for example, a resin passenger airbag grid 9 in which a boss 92 is erected on a housing 91 formed on the back surface 9a side as shown in FIG. 12 may be used. The passenger airbag 9 is connected and fixed to the instrument panel 71 with screws 72 via bosses 92. The airbag device 82 using the passenger airbag grid 9 has a structure that protects the occupant by opening the airbag door portion 86 and popping out the bag 82a when the vehicle collides (FIG. 13). Reference numeral 81 is an airbag guide frame, reference numeral 81a is a through hole provided in the frame 81, reference numeral 83 is an airbag case, reference numeral 83a is a hook, reference numeral 84 is a bracket, and reference numeral 85 is reinforcement.
By the way, when the airbag door portion 86 is deployed, the passenger airbag 9 is pushed up and deformed as indicated by the black arrow in FIG. The screw connection structure to the instrument panel 71 by the passenger airbag grid main body 90, the casing 91 constituted by the plate-like portion, and the boss 92 is difficult to absorb the displacement amount at the time of deformation of the passenger airbag grid 9. In the worst case, the base 91a of the casing 91, which is the weakest in strength, may be peeled off. As a countermeasure against peeling, a method of increasing the plate thickness of the casing 91 is also conceivable. However, in this case, since the casing 91 lands on the design back surface 9a of the passenger airbag grid product 9, this time, appearance defects such as sink marks are induced on the design surface side.
Under such circumstances, an invention that addresses the problem while taking measures against sink marks has also been proposed (for example, Patent Document 1).

JP 2001-237562 A

  Patent Document 1 is a resin-molded housing that accommodates electrical circuit components. As described in claim 1, “a rib that supports the electrical circuit components is formed on the back surface of the resin-molded housing. The rib is formed integrally with the body, and the rib includes a rib portion formed thinner than the resin-molded casing, and a boss portion formed integrally on the rib portion, The rib portion is joined to the resin molded casing. Further, in the paragraph 0126, “The rib portion 3B has a box shape, in this example, as shown in FIG. In the example, by bonding to the back surface of the decorative cover body 1a), the bonding area to the resin molded housing is made larger than the rib 2A shown in FIG. 5, and the mechanical strength of the rib 2B with respect to the resin molded housing 1 is increased. The invention is disclosed.

  However, the shape of the rib portion of Patent Document 1 is still insufficient to absorb the impact when the airbag door is deployed. If it demonstrates in FIG. 13, at the time of airbag door expansion | deployment, it was necessary to improve the tensile strength of the vertical direction which can endure peeling by the casing base 91a (in patent document 1, the rib part base). There is a limit to increasing the tensile strength against the displacement amount of the passenger air backgrid 9 when it is deformed. In addition, in resin molded products for vehicles such as passenger airbag grids, unlike resin molded products that contain electrical circuit components, the vehicle is subjected to severe conditions such as vibration and impact during running of the vehicle, and air bag doors. Because of the impact force at the time of deployment, it needed higher strength to withstand pressure from various angles.

  The present invention solves the above-mentioned problem, and prevents the occurrence of sink marks on the product design surface side, but also has a structure that can absorb the amount of displacement by itself, ensuring the prevention of peeling at the base of the frame and contributing to quality improvement. It aims at providing the resin molded product for vehicles with an engaging part which can be performed.

In order to achieve the above object, the gist of the invention described in claim 1 is that a pair of leg pieces are provided on the back surface of the plate-like part of the resin molded product for a vehicle, and the upper portions of both leg pieces are placed between each other. A vehicle molded resin product with an engaging portion in which a casing formed by connecting the two with a top plate is integrally formed, and further, an engaging portion that stands on the top plate and is integrally formed for connection with a mating member is formed. The pair of leg pieces are arranged to face each other, and a curved plate portion having a front view arc shape and / or a plate-like inclined portion that is inclined with respect to the back surface of the plate-like portion is formed on each of the both leg pieces. Furthermore, the both inclined portions related to the pair of leg pieces are parallel plate portions extending from the back surface of the plate-like portion in the same direction while maintaining equal intervals, and the curved plate portion or / And the position of the engaging portion varies relative to the back surface of the plate-like portion in the vertical direction due to the bending deformation of the inclined portion. The engaged portion with a vehicle for a resin molded product, characterized in that there was Unishi.

  The resin molded product for a vehicle with an engagement portion according to the present invention has a structure capable of absorbing the amount of displacement generated by an impact or the like while preventing an appearance defect from occurring on the product design surface side. An object of the present invention is to provide a resin molded product for a vehicle with an engagement portion that can reliably prevent peeling and contribute to quality improvement.

It is a schematic perspective view of the resin molded product for vehicles with an engaging part which concerns on the reference form 1. FIG. FIG. 2 is a partially enlarged perspective view of FIG. 1. FIG. 2 is a perspective view of one housing illustrated in FIG. 1. It is a front view of the housing of FIG. FIG. 4 is a partial cross-sectional explanatory view showing a state when deformation of a resin molded product occurs in a screw connection structure to a mating member by the housing of FIG. 3. FIG. 3 is a cross-sectional view illustrating a state in which a gap is generated between the mating member and the housing, and (b) is an explanatory cross-section in which the housing is screwed to the mating member from the state of (a). FIG. FIG. 7 is a cross-sectional view for explaining a comparison in the case of using a conventional housing instead of FIG. (A), (b) is a front view of a casing of another embodiment different from the casings of FIGS. 3 to 6, corresponding to FIG. 4. It is a front view of the housing of Embodiment 2, and is a figure corresponding to FIG. FIG. 10 is a partial cross-sectional explanatory diagram illustrating a state in which a resin molded product is deformed in the screw connection structure to the mating member by the housing of FIG. It is a front view of the housing of Embodiment 3, and is a figure corresponding to FIG. It is explanatory sectional drawing of a prior art. It is explanatory sectional drawing of a prior art.

Hereinafter, the resin molded product for vehicles with an engaging part which concerns on this invention is explained in full detail.
(1) Reference form 1
1 to 8 are reference forms of a resin molded product for vehicles with an engaging portion, FIG. 1 is an overall perspective view thereof, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a perspective view of a housing. Is a front view of the housing of FIG. 3, FIG. 5 is a partial cross-sectional explanatory view showing a state in which the resin molded product is deformed by screw connection between the housing and the mating member, and FIG. FIG. 7 is an explanatory cross-sectional view of a state in which a gap is generated between the case and (b) is an explanatory cross-sectional view in which the case is screw-connected from the state of (a) to the mating member, and FIG. 7 is a conventional case in place of FIG. FIG. 8 is a view showing another aspect of the chassis instead of the chassis shown in FIG. FIG. 1 is simplified by showing only a few main housings with engagement portions, and illustration of reinforcing standing ribs provided on the back surface of the plate-like portion is omitted. In order to make the drawings easy to understand, the leg pieces of the frame are drawn thick.

The resin molded product 1 for a vehicle with an engaging portion of the present embodiment (hereinafter also simply referred to as “resin molded product”) is applied to a passenger airbag grid as an interior product for a vehicle. The vehicle resin molded product 1 is a passenger airbag grid having an opening 12 for opening the airbag. The resin molded product 1 is a plate-like injection molded product made of a thermoplastic resin as shown in FIG. 1 and includes a housing 2 and an engaging portion 6.
A separately formed airbag guide frame body 81 is bonded and fixed to the back surface 11b of the plate-like portion 11 of the resin molded product 1 in the form of a substantially rectangular tube frame (FIGS. 1 and 2). The outer flange 811 of the frame 81 adheres to the plate-like part back surface 11b. An H-shaped slit 86a as shown in FIG. 2 is provided in the bottom plate 810 of the frame body 81c to form two airbag door portions 86. Reference numeral 86b denotes a constricted portion connecting the two airbag door portions 86. On the back surface 11b of the resin molded product 1 arranged in the frame 81c, for example, a groove (not shown) having a substantially U-shaped cross section in which the groove bottom fits in front of the design surface 11a is provided in accordance with the slit 86a. . This is because when the airbag door portion 86 is deployed, the plate-like portion 11 of the frame body 81 c of the resin molded product 1 is smoothly transferred to the opening portion 12.

  A plurality of casings 2 are provided on the back surface 11b of the plate-like portion 11 of the resin molded product 1 outside the frame body 81 (FIGS. 1 and 2). A pair of leg pieces 3 are provided on the plate-like part back surface 11b so as to be spaced apart from each other, and a housing 2 formed by connecting upper portions of both leg pieces 3 with a top plate 4 is integrally formed. The housing 2 is composed of a leg piece 3 and a top plate 4, and a pair of leg pieces 3 are arranged to face each other. Each leg piece 3 is formed with a plate-like inclined portion 31 that is inclined with respect to the plate-like portion back surface 11b.

Specifically, the pair of leg pieces 3 are arranged opposite to each other in parallel, and an inclined part 31 that is inclined with respect to the back surface 11b of the plate-like part 11 is formed in each leg piece 3 in an equal cross-sectional shape in the longitudinal direction. (Fig. 3). Each leg piece 3 of the housing 2 is provided with a plate-like inclined portion 31 that has an equal cross-sectional shape in the direction perpendicular to the paper surface and is inclined upward with respect to the plate-like portion back surface 11b in the front view of FIG.
The housing 2 according to the present embodiment has a shape in which one of the inclined portions 31 related to the pair of leg pieces 3 is in a front view and the other is in a front view. As shown in FIG. 4, it is assumed that the front side view of the left side of the paper surface <the inclined portion 31 of the shape and the front view of the right side of the paper surface> has the inclined portion 31. Both inclined portions 31 extend from the plate-like portion back surface 11b in a reverse C shape when viewed from the front. An extended swash plate portion 31a that gradually moves upward from the counterpart inclined portion 31 is extended. The distal end of the extended swash plate portion 31a becomes a bent portion 35, and thereafter, the extended swash plate portion 31a extends in the shape of a letter C in front view. A reduced swash plate portion 31b that gradually approaches the counterpart inclined portion 31 toward the tip is extended. Further, the upper rims of the reduced swash plate portions 31b bend inward and extend horizontally, and a plate-like top plate 4 like an upper cover is integrally formed above both leg pieces 3. The left and right symmetrical housing 2 as shown in FIG. The casing 2 provided with the top plate 4 on the leg pieces 3 is formed integrally with the leg piece 3 so as to place the top plate 4 on the both leg pieces 3 (FIG. 6). ). In FIG. 4, the shape of the housing 2 with the plate-like portion 11 added is a hollow hexagon, and the opening 20 in front of the paper surface is part of the through hole 2 c that penetrates the housing 2 in the direction perpendicular to the paper surface. It has become.
The thickness t ₁ of the leg piece 3 is formed to be 40% or less of the thickness t ₂ of the plate-like portion 11 that becomes the base of the leg piece 3 (FIG. 4). When the thickness t ₂ of the plate-like portion 11 exceeds 40%, the sink mark on the design surface 11a of the plate-like portion 11 becomes readily released.

Further, a boss 6 a that is an engaging portion 6 that serves for connection with the instrument panel main body 71 that is a counterpart member stands on the surface 4 a of the top plate 4. The boss 6a is molded integrally with the resin molded product 1 when the resin molded product 1 is molded, like the housing 2. Similarly to FIG. 12, the resin molded product 1 is connected and fixed to the instrument panel main body 71 by screws 72 via the bosses 6a. Reference numeral 61 denotes a cylindrical portion as a boss body, reference numeral 62 denotes a boss hole, and reference numeral 63 denotes a reinforcing rib of the boss 6a.
The engaging portion 6 may be a rod-like or shaft-like protrusion used for connection with the mating member 71, and may be a clip 6b as shown in FIGS. 1 and 2, for example. Reference numeral 66 denotes a locking portion provided in the clip main body 65.

In the resin molded product 1 in which the engaging portion 6 and the housing 2 provided with the inclined portion 31 are integrally molded, the position of the engaging portion 6 is the plate-like portion 11 due to the bending deformation of the inclined portion 31. It is made to change relative to the back surface in the vertical direction. According to the external force applied to the plate-shaped part back surface 11b in the vertical direction, the inclined part 31 has a structure that can be expanded and contracted by the elastic deformation of the resin as shown in FIG.
FIG. 5 shows that the plate-like portion 11 of the resin molded product 1 is moved upward from the solid line position by the external force in the direction of the white arrow from the initial chain line position where the resin molded product 1 is connected and fixed to the counterpart member 71 with the screw 72. Show the state. The inclined portion 31 having a “<” shape when viewed from the front extends in the vertical direction in FIG. 5 to absorb the amount of displacement of the plate-like portion 11 due to the external force.

Further, another example in which the position of the engaging portion 6 is relatively changed in the vertical direction with respect to the back surface 11b of the plate-like portion 11 due to the bending deformation of the inclined portion 31 will be shown.
When the resin molded product 9 having the general casing 91 as shown in FIG. 7A is attached to the mating member 71 with the screw 72, an installation error gap ε may occur in the field. When the screw ε is left while leaving the gap ε between the end surface 921 of the boss cylindrical portion 92 and the counterpart member 71 as it is, the plate-like portion 90 warps as shown in FIG. On the other hand, when the resin molded product 1 is attached to the mating member 71 with the screw 72 as shown in FIG. 6 (a), the inclined portion 31 extends as shown in FIG. The height of the housing 2 is increased and the gap ε is absorbed. Since the inclined portion 31 extends by the gap ε, the plate-like portion 11 is not warped, and the flat surface of FIG.

3 to 6 show the housing 2 having a shape in which one of the inclined portions 31 of the leg piece 3 is in the shape of the front view and the other in the shape of the front view. In the front view of FIG. 4, an extended swash plate portion 31 a that gradually moves away from the counterpart inclined portion 31 is first extended from the plate-like portion back surface 11 b to the opposite inclined portion 31, and the tip thereof becomes a bent portion 35. Is a shape in which a reduced swash plate portion 31b that gradually approaches the counterpart inclined portion 31 extends in a letter C shape when viewed from the front.
Instead of this, for example, as shown in FIG. 8 (a), the housing 2 has a reduced slant that the both inclined portions 31 first approach the counterpart inclined portion 31 from the plate-shaped rear surface 11b toward the front end in a letter C shape as viewed from the front. The plate portion 31b is extended, and the tip of the plate portion 31b becomes a bent portion 35, and this time, the extended swash plate portion 31a that extends away from the counterpart inclined portion 31 is extended in the shape of an inverted C in front view toward the tip. be able to.
In addition, the housing 2 has a slanted portion 31 having a <shaped,> shaped unit comprising the expanded swash plate portion 31a, the bent portion 35, and the reduced swash plate portion 31b of FIGS. The shape can be repeated multiple times (here, twice). Similar to FIGS. 3 to 6, due to the bending deformation of the inclined portion 31, the position of the engaging portion 6 varies relative to the back surface 11 b of the plate-like portion 11 in the vertical direction.

In FIGS. 4 and 8, both are through holes 2c penetrating through the inside of the housing 2 from the opening 20 on the front side of the housing 1 in the direction perpendicular to the paper surface. However, the housing of FIGS. You may provide a standing wall in the back side of 2 to such an extent that bending deformation is not inhibited. Further, the leg piece 3 is only the <-,>-shaped plate-like inclined portion 31. In addition to the inclined portion 31, for example, the leg piece 3 including a plate-like standing portion vertically raised on the plate-like portion 11 is used. It can also be. This is because the amount of bending deformation of the inclined portion 31 is reduced by the amount of the standing portion introduced, but the effect of the present invention can be obtained.
It is desirable that the standing wall is not connected to the leg piece 3 and does not hinder the deformation of the leg piece 3. Further, the standing wall may be inclined with respect to the plate-like portion 11.

(2) Embodiment 2
In this embodiment, the housing 2 is a resin molded product 1 different from the reference embodiment 1, FIG. 9 is a front view of the housing 2, and FIG. 10 shows the engaging portion 6 of the housing 2 to the mating member 71 with screws 72. FIG. 3 is a partial cross-sectional explanatory view showing a state in which deformation is generated in the resin molded product 1 after being connected and fixed.

Unlike the reference form 1, the resin molded product 1 of the present embodiment has leg pieces 3 constituting the housing 2 as shown in FIG. The pair of leg pieces 3 are arranged to face each other, and a plate-like inclined portion 31 that is inclined with respect to the back surface 11b of the plate-like portion 11 is formed on each of the both leg pieces 3, as in the first embodiment . Accordingly, both inclined portions 31 are extended in the same direction with an equal interval. Both inclined portions 31 related to the pair of leg pieces 3 are parallel plate portions 37 extending from the back surface 11b of the plate-like portion 11 while maintaining equal intervals in the same direction. The position of the engaging portion 6 is changed relative to the back surface 11 b of the plate-like portion 11 in the vertical direction by the bending deformation of the parallel plate portion 37. The parallel plate portion 37 as the inclined portion 31 extends as shown in FIG. 10 according to the external force applied in the vertical direction with respect to the plate-like portion back surface 11b.
FIG. 10 shows that the plate-like portion 11 of the resin molded product 1 is moved downward to the solid line position by the external force in the direction of the white arrow from the initial chain line position where the resin molded product 1 is connected and fixed to the mating member 71 with screws. Show the state. When the plate-like portion 11 is moved, the plate-like parallel plate portion 37 that is inclined in the same direction with respect to the back surface 11b of the plate-like portion 11 rises from the inclined state and absorbs the displacement of the plate-like portion 11 due to external force. . In the present embodiment, the parallel plate portion 37 itself is the leg piece 3. Other configurations are the same as those in the first embodiment , and the description thereof is omitted. The same reference numerals as those in the reference form 1 denote the same or corresponding parts.

(3) Embodiment 3
In this embodiment, the housing 2 is a resin molded product 1 different from the reference embodiment 1 and the embodiment 2, and is a resin molded product 1 having the housing 2 as shown in FIG. A pair of leg pieces 3 constituting the housing 2 is a curved plate portion 38 having a front view arc shape as shown in the figure. The curved plate portion 38 has an equal cross-sectional shape in the direction perpendicular to the paper surface when viewed from the front in FIG. 11, and the bulging portions 38a of both curved curved plate portions 38 are projected outward. A casing 2 in which the upper portions of a pair of leg pieces 3 composed of standing bent plate portions 38 are connected to each other by a top plate 4 is integrally formed on the plate-like portion back surface 11 b of the resin molded product 1. The engaging part 6 is integrally formed. Thus, due to the bending deformation of the curved plate portion 38, the position of the engaging portion 6 is relatively changed in the vertical direction with respect to the plate-like portion back surface 11b. Other configurations are the same as those in the first embodiment , and the description thereof is omitted. The same reference numerals as those in the reference form 1 denote the same or corresponding parts.

(4) Effect Since the resin molded product 1 configured as described above forms the plate-like inclined portion 31 that is inclined with respect to the bent plate portion 38 and the plate-like portion back surface 11b, the bent plate 38 of the leg piece 3 and / or the inclined portion. The part 31 is easily bent and deformed with respect to the plate-like back surface 11b. A pair of leg pieces 3 are arranged to face each other, a curved plate 38 and / or a plate-like inclined portion 31 inclined with respect to the back surface 11b of the plate-like portion 11 is formed, and the engaging portion 6 is an upper surface of the top plate of the housing 2 4a, and the bending plate portion 38 and the inclined portion 31 are bent and deformed so that the position of the engaging portion 6 is changed relative to the back surface of the plate-like portion 11 in the vertical direction. Can easily absorb the amount of displacement.
If the housing 91 of FIG. 13 has an impact displacement, there is a risk of peeling at the root 91a. However, the housing 2 according to the present invention has the curved plate portion 38 and the inclined portion 31 before the housing base 29 is peeled off. The amount of displacement is absorbed by elastic deformation. Even when the passenger airbag grid 9 is pushed up and deformed when the airbag door 86 is deployed, the curved plate portion 38 and the inclined portion 31 extend due to bending deformation and smoothly absorb the displacement at the time of deformation. Conventionally, when the airbag door portion 86 is deployed, the strength of the housing 2 according to the resin molded product 1 is not countered by increasing the strength of the case where the housing base 29 is peeled off and the strength is insufficient. The leg pieces 3 are deformed and expanded by themselves to absorb the displacement and solve the problem.
Meanwhile, since the leg 3 is formed by more than 40% of the wall thickness t ₂ of the plate-like portion 11 as a ground plane, never sink marks occur in the design surface 1a side of the resin molded article 1. The appearance of the design is not impaired.
Usually, there are a plurality of housings 2, and the passenger airbag grid is fixedly supported to the instrument panel. However, the stress concentrated on a part of the housings 2 due to the bending plate portion 38 or the inclined portion 31 being bent and deformed. Can be dispersed in a plurality of housings 2. In addition, kinetic energy is converted into thermal energy by resin deformation, and stress applied to the base of the housing 2 is reduced.

In addition, since the resin molded product 1 is a resin molded product for vehicles, it is placed in a harsh environment. In the vehicle resin molded product 1 in which the engaging portion 6 stands on the housing 2, the housing 2 receives external forces such as vibration and impact from all directions when the vehicle travels. The resin molded product 1 like the reference form 1 and the embodiment 2 has the curved plate portion 38 and the inclined portion 31 on the leg piece 3, and applies external force, compression force, etc. from various directions including the left and right lateral directions. In the resin molded product 1 for a vehicle placed in a severe environment, it can respond smoothly from the movement of the curved plate portion 38 and the inclined portion 31 and is extremely effective.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. Shape, size of resin molded product 1, housing 2, leg piece 3, inclined portion 31, parallel plate portion 37, curved plate portion 38, top plate 4, reinforcing rib 5, engaging portion 6, mating member 71, etc. The number, material, etc. can be appropriately selected according to the application. For example, although the leg piece 3 having the curved plate portion 38 or the inclined portion 31 is used in the embodiment, the curved plate portion 38 and the inclined portion 31 can be used in combination with the leg piece 3. Moreover, although embodiment uses the passenger airbag grid for the resin molded product 1, it is not limited to this, Of course, It can apply to various resin molded products for vehicles (vehicle interior products).

1 Resin molded products for vehicles (resin molded products)
11 Plate-like part 11b Back side (Plate-like part back side)
2 Housing 3 Leg piece 31 Inclined portion 37 Parallel plate portion 38 Curved plate portion 4 Top plate 6 Engaging portion 71 Mating member (instrument panel body)

Claims (1)

On the back surface of the plate-shaped portion related to the resin molded product for vehicles, a pair of leg pieces are provided apart from each other, and a casing formed by connecting the upper portions of both leg pieces with a top plate is formed integrally. A resin molded product for an automotive vehicle with an engagement portion that is raised on a top plate and integrally formed with an engagement portion for connection with a mating member,
A pair of the leg pieces are disposed to face, and each of the legs piece, plate-like inclined portion inclined with respect to the rear surface of the curved plate portion or / and the plate portion of the front view arc is formed, further, a pair The two inclined portions according to the leg pieces are parallel plate portions that are extended from the back surface of the plate-like portion in the same direction while maintaining equal intervals, and the curved plate portion and / or the inclined portion. The vehicle molded resin product with an engaging portion, wherein the position of the engaging portion is relatively changed in the vertical direction with respect to the back surface of the plate-like portion due to the bending deformation of the vehicle.

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