JP4514528B2 - Shock absorbing member - Google Patents

Description

  The present invention relates to an impact absorbing member, and more specifically, presents a long rib structure including a first rib extending along a longitudinal direction and a plurality of second ribs intersecting the first rib, The present invention relates to an impact absorbing member disposed inside a portion facing a passenger compartment of a vehicle.

  For example, FIG. 9 is a schematic perspective view showing the side portion of the driver's seat in the roof side portion 14 facing the passenger compartment of the vehicle body 10 of an automobile (vehicle), with the vehicle body constituent members omitted, and FIG. FIG. 9 is a sectional view taken along line XX of FIG. A roof side rail 16, which is one of the vehicle body components forming the skeleton structure of the vehicle body 10, extends on the roof side portion 14 that extends in the front-rear direction of the vehicle body 10 on the left and right sides of the roof portion 12. A body panel (not shown) constituting the outer surface of the vehicle body is located outside the roof side rail 16. A molded ceiling member 20, which is one of vehicle interior members molded into a required shape, is mounted on the roof portion 12 in the passenger compartment 18 in a state of covering the roof side rail 16 described above.

  On the other hand, in various automobiles produced in recent years, various measures are taken to reduce occupant injury when a side collision accident occurs as well as occupant injury reduction when a frontal collision accident occurs. That is, when a side collision accident occurs in which another vehicle collides with the side of the vehicle, the head H of the occupant thrown sideways due to the reaction caused by the collision just collides with the roof side portion 14 described above. For this reason, a technique for reducing the injury of the occupant's head H by placing an impact absorbing member EA1 having an impact absorbing function inside the roof side portion 14 has been put into practical use. Here, as the above-described shock absorbing member EA1, for example, hard urethane, aluminum pipe, honeycomb board, and a rib structure made of synthetic resin are adopted. The synthetic resin rib structure as exemplified in 9 is suitably employed. For example, Patent Document 1 discloses an injury mitigation measure in which an impact absorbing member is attached to the roof side portion.

  As illustrated in FIGS. 9 and 11, the shock absorbing member EA1 having a rib-like structure has an outer shape that can be accommodated in the space 22 defined between the roof side rail 16 and the molded ceiling member 20 described above. For example, the total length L is 600 mm or more. The shock absorbing member EA1 is disposed not only on the side portion of the driver's seat in the roof side portion 14, but also on the side portion of the passenger seat, the left and right side portions of the rear seat, and the like. The outer shape and size are set according to the inner shape. The shock absorbing member EA is specifically molded from polypropylene having a flexural modulus of about 590 MPa based on an injection molding technique, and intersects the first rib 30 extending along the longitudinal direction and the first rib 30. A plurality of second ribs 32 are integrally formed with a lattice shape, and the thicknesses of the ribs 30 and 32 are each set to about 1 mm. Therefore, when the head H of the occupant collides with the roof side portion 14, the impact force is applied through the molded ceiling member 20, so that the first rib 30 and / or the second rib 32 are buckled. Thus, shock absorption is intended.

  In the past, such an impact absorbing member EA1 has been mounted in such a manner that it is directly fixed to the roof side rail 16 of the vehicle body 10 with a screw or the like. For this reason, in the automobile assembly line, the work of attaching the shock absorbing member EA1 to the roof side rail 16 and the work of attaching the molded ceiling member 20 to the roof portion 12 are separate processes, and therefore the number of assembly work steps increases. It was hindering efficiency. Therefore, in recent years, the shock absorbing member EA1 is attached and fixed to the back surface 20B of the above-described molded ceiling member 20 in advance, and the shock absorbing member EA is simply attached to the molded ceiling member 20 in the assembly line. The method of completing the installation at the same time has come to be adopted.

  FIG. 12 is an explanatory view exemplifying a schematic configuration of an apparatus implemented for attaching and fixing the preformed impact absorbing members EA1 and EA1 to the left and right side edges of the back surface 20B of the molded ceiling member 20. FIG. This device 50 is pivotally mounted on the main body 52 formed with a set surface 52A for setting the molded ceiling member 20 and on the left and right sides of the set surface 52A so as to be rotatable, and sets the impact absorbing member EA1. And support bodies 54 and 54 on which a set surface 54A is formed. That is, the molded ceiling member 20 is set on the set surface 52A of the main body 52, and the shock absorbing member EA1 is set on the set surface 54A of each support 54 (FIG. 13). The impact absorbing member EA1 is brought into contact with and held at a required position on the side edge of the back surface 20B of the molded ceiling member 20 (FIG. 14). In this state, the impact absorbing member EA is formed by an adhesive such as hot melt. It is designed to be attached and fixed. In the apparatus 50 shown in the figure, as shown in FIG. 15, a total of four positioning fixing pins 56 (56A, 56B, 56C, 56D) are projected on the set surface 54A of the support body 54, and also absorb the shock. The member EA1 has a total of four fitting holes 34 (34A, 34B, 34C, 34D) formed in a wall portion formed in a rectangular portion defined by the first rib 30 and the second rib 32. Each of the positioning fixing pins 56 (56A, 56B, 56C, 56D) is inserted into the corresponding fitting holes 34 (34A, 34B, 34C, 34D), so that the impact absorbing member EA1 with respect to the support 54 is Positioning and set fixing are achieved.

JP-A-11-268666

  By the way, as described above, the above-mentioned shock absorbing member EA1 made of synthetic resin that exhibits a rib structure has a total length L of 600 mm or more, and the first rib 30 and the second rib 32 are as thin as about 1 mm. Therefore, when the injection molding technique is used for integral molding, molding distortion is likely to occur, and in particular, the degree of expansion / contraction of the first rib 30 extending in the longitudinal direction increases. For this reason, the distances S1, S2, S3 of the positioning fixing pins 56 (56A, 56B, 56C, 56D) described above are equal to the distances L1, L2, L3 of the fitting holes 34 (34A, 34B, 34C, 34D). In many cases, they do not coincide with each other, and when the shock absorbing member EA1 is set on the set surface 54A of the support 54, the shock absorbing member EA1 is forcibly deformed so that each positioning fixing pin 56 (56A, 56B, 56C, 56D) Corresponding fitting holes 34 (34A, 34B, 34C, 34D) had to be fitted. In other words, the shock absorbing member EA1 has a proper length L when it is set on the support 54, but remains in a state in which internal stress is expressed because it is forcibly deformed.

  On the other hand, the molded ceiling member 20 described above includes a core material 24 made of urethane foam, resin felt, or the like, a surface material 26 such as a nonwoven fabric laminated on the surface of the core material 24 (an outer surface facing the passenger compartment 18), and a core. It has a three-layer structure composed of a back material 28 such as a nonwoven fabric laminated on the back surface (the outer surface facing the roof side rail 16) of the material 24, and a three-layer structure composed of the core material 24, the surface material 26 and the back material 28. Is formed into an inner shape of the roof portion 12 based on a hot press or the like. Therefore, the molded ceiling member 20 has a thickness of about 3 to 5 mm and is lightweight and has an appropriate shape retaining property, but the rigidity of the core material 24, the front surface material 26, and the back surface material 28 is not so high. Therefore, when an external force is applied, distortion due to bending deformation or torsional deformation is likely to occur.

  For this reason, after the impact absorbing member EA1 is attached and fixed to the molded ceiling member 20 in the device 50 described above, when the integrated impact absorbing member EA1 and the molded ceiling member 20 are removed from the device 50, the corresponding Since the shock absorbing member EA1 returns to its original shape so as to eliminate internal stress, the molded ceiling member 20 has a problem of distortion due to bending deformation and / or twisting deformation. Accordingly, (a) wrinkles or the like are generated on the surface 20A of the molded ceiling member 20 to cause a deterioration in the texture of the molded ceiling member 20, or (b) the molded ceiling member 20 is not properly aligned with the roof portion 12. Various inconveniences such as the inability to perform a smooth assembly operation of the ceiling member 20 have occurred.

  In view of this, the present invention provides an impact absorbing member that is capable of adjusting the length along the longitudinal direction so that the entire length can be easily adjusted, thereby enabling proper attachment and fixing to the vehicle interior member. The purpose is to do.

In order to solve the above-mentioned problems and achieve the intended purpose, the present invention provides:
A first body extending along the longitudinal direction and a plurality of second ribs intersecting with the first rib are integrally formed in a lattice shape to form a long rib structure and face the passenger compartment of the vehicle and a shock absorbing member disposed between the vehicle interior member,
The first rib and the second rib define a fitting hole for fitting with a positioning fixing pin protruding from a device used when the shock absorbing member is fixedly attached to the back surface of the vehicle interior member. In each of the shock absorbing members formed in the wall portion formed in the rectangular portion ,
It said first rib between the fitting hole, so as to permit expansion and contraction deformation along the longitudinal direction of the first rib, provided bent or curved portion which opens in a direction crossing the longitudinal direction,
The bent or curved portion is characterized in that the formation width is set to be the same as the width dimension of the first rib provided continuously to the bent or curved portion .

  According to the shock absorbing member of the present invention, since the deformed portion is provided at the required position of the first rib extending in the longitudinal direction, the overall length can be easily optimized by adjusting the length based on the deformation of the deformed portion. There is an advantage to become. Therefore, since internal stress does not appear in the shock absorbing member when fixing to the back surface of the molded ceiling member, which is a vehicle interior member, it is possible to prevent the molded ceiling member from being deformed after fixing and fixing the molded vehicle body. There are beneficial effects such as the efficiency of assembling the ceiling member.

  Next, the shock absorbing member according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. In the present embodiment, an impact absorbing member having the same outer shape and size as the conventional impact absorbing member EA1 illustrated in FIGS. 9 and 11 will be described. Further, a roof side rail 16 which is one of vehicle body constituent members extending to the roof side portion 14, a molded ceiling member 20 installed on the roof portion 12 so as to face the roof side portion 14, and the like, FIG. 15, the same members and parts as those already described are denoted by the same reference numerals and described.

  FIG. 1 is a schematic perspective view showing the overall shape of an impact absorbing member EA according to a preferred embodiment. The shock absorbing member EA of the present embodiment is set to an outer shape and size that can be accommodated in the space 22 defined between the roof side rail 16 and the molded ceiling member 20 described above. For example, the total length L is 600 mm or more. It is long. Then, it is attached and fixed in advance to the rear surface 20B of the molded ceiling member 20 that is a vehicle interior member installed so as to face the roof side portion 14, and the assembly of the molded body 10 to the vehicle body 10 is performed simultaneously with the assembly work of the vehicle body 10. It is disposed on the roof side portion 14. Such an impact absorbing member EA is formed from polypropylene having a flexural modulus of about 590 MPa, for example, based on an injection molding technique, and extends along the longitudinal direction of the impact absorbing member EA and intersects with the first rib 30. Thus, a plurality of second ribs 32 positioned at appropriate intervals along the longitudinal direction of the first rib 30 are formed in a lattice shape.

  The first rib 30 has a uniform thickness as a whole and is set to about 1 mm, and the first rib 30 extends continuously from the front end to the rear end of the shock absorbing member EA and intermittently extends. In addition, in the impact absorbing member EA of the present embodiment, a total of three first ribs 30 are formed extending substantially in parallel. That is, the first rib 30 located at the center in the vertical direction extends continuously over the entire length L of the shock absorbing member EA, and the other first and lower first ribs 30, 30 are , Intermittently extending in the middle part. Since each first rib 30 has a space 22 defined by the roof side rail 16 and the molded ceiling member 20 for each part, the width dimension is different for each part along the longitudinal direction. Has changed somewhat.

  Each of the second ribs 32 is set to have a thickness of approximately 1 mm, and the first ribs 30 extend in parallel at the intervals in the longitudinal direction of the first ribs 30 as appropriate. Is formed. Since each second rib 32 has a different cross-sectional shape of the space 22 defined by the roof side rail 16 and the molded ceiling member 20 for each part, the second ribs 32 have individual shapes. There are many things that are different.

  In addition, in the impact absorbing member EA of the present embodiment, a total of four attachment portions 36 for attaching and fixing to the molded ceiling member 20 are formed in the intermediate portion, the front portion, and the rear end portion in the longitudinal direction. These attachment portions 36 are basically the same as the conventional shock absorbing member EA1 illustrated in FIG. 11, and apply an adhesive such as hot melt on the outer surface thereof. By subsequently pressing the molded ceiling member 20 against the rear surface 20B, the molded ceiling member 20 is bonded to the molded ceiling member 20, and the impact absorbing member EA is fixedly attached to the molded ceiling member 20.

  Further, in the shock absorbing member EA of the present embodiment, a wall portion is formed in a rectangular portion defined by the first rib 30 and the second rib 32 at the longitudinal intermediate portion, the front portion, and the rear end portion. The fitting holes 34 (34A, 34B, 34C, 34D) corresponding to the positioning fixing pins 56 projecting from the set surface 54A of the support body 54 of the apparatus 50 are respectively formed in these wall portions. ing. Each fitting hole 34 (34A, 34B, 34C, 34D) is basically the same as that formed in the conventional shock absorbing member EA1 illustrated in FIG. 11, and each positioning fixing pin 56 (56A, 56B). , 56C, 56D) are correspondingly inserted and fitted so that the shock absorbing member EA can be set and positioned with respect to the support 54.

  And in the impact-absorbing member EA of a present Example, as illustrated in FIG. 1 and FIG. 2, the expansion / contraction along the longitudinal direction of the said 1st rib 30 is carried out to the required position of the 1st rib 30 extended in the longitudinal direction. An expansion / contraction deformation part (deformation part) 40 that allows deformation is provided. Accordingly, it is possible to adjust the length of the first rib 30 by deforming the shape of the expansion / contraction deformation portion 40, and thus the length of the entire shock absorbing member EA can be adjusted. Can be adjusted freely within the required range.

  Specifically, at a total of three locations between the four fitting holes 34 (34A, 34B, 34C, 34D) described above, the first ribs 30 extending at those portions are stretched and deformed. 40, 40 is provided, and the expansion / contraction deformation part 40 is also provided on the connecting rod 38 that extends substantially parallel to the first rib 30 and connects the attachment parts 36, 36. . Thereby, the shock absorbing member EA can adjust the distances L1, L2, and L3 between the fitting holes 34 (3A34B34C34D), and can adjust the full length L freely. The shock absorbing member EA has a length adjustment region 42 that is a portion where the expansion / contraction deformation portion 40 is formed and a general region that is a portion other than the length adjustment region 42 because the expansion / contraction deformation portion 40 is newly provided. 44 for convenience.

Aforementioned elastic deformation portion 40, as illustrated in FIG. 2, is a bent shape that exhibits substantially U-shape which opens in a direction crossing the extending direction of the first rib 30 (the longitudinal direction), the first rib When an external force along the longitudinal direction is applied to 30, the corner portion 40 </ b> A is bent and the opening interval of the opening portion is changed, so that expansion / contraction deformation is expressed. For example, the center expansion / contraction deformation part 40 will be described. When the shock absorbing member EA is pressed from the front and rear ends, as illustrated in FIG. The opening interval is reduced, thereby reducing the interval L2 between the adjacent fitting holes 34 (34B, 34C), the first rib 30 is shortened, and the overall length L of the shock absorbing member EA is reduced. Further, when the impact absorbing member EA is pulled in the longitudinal direction, as illustrated in FIG. 5, each expansion / contraction deformation portion 40 is expanded and bent, and the opening interval of the open portion is greatly changed. The interval L2 between the adjacent fitting holes 34 (34B, 34C) is enlarged, the first rib 30 is extended and deformed, and the overall length L of the shock absorbing member EA is increased. Although not shown, the other front and rear expansion / contraction deformation portions 40, 40 are similarly deformed.

  As shown in FIG. 3, each expansion / contraction deformation portion 40 has a small corner portion 40 </ b> A, and can be easily expanded or contracted simply by applying an appropriate tensile force or pressing force. It is considered that when it is bent and deformed, it is held in its shape and does not elastically return to its original shape. Therefore, the impact absorbing member EA is held without being expanded and contracted after the length adjustment.

  Further, as illustrated in FIG. 2, the formation width W <b> 1 of the expansion / contraction deformation portion 40 formed on each first rib 30 is substantially the same as the width W of the first rib 30 connected to the expansion / contraction deformation portion 40. They are set the same. For this reason, since the expansion / contraction deformation portion 40 has the same degree of rigidity as the first rib 30, the length adjustment region 42 in which the expansion / contraction deformation portion 40 is formed has the same impact as the other general regions 44. Has absorption performance. Therefore, even if the head H of the occupant collides with the length adjustment area 42, the same obstacle mitigation effect as that when colliding with the general area 44 can be achieved.

  As described above, since the shock absorbing member EA of the present embodiment is provided with the expansion / contraction deformation portion 40 at a required position of the first rib 30 extending in the longitudinal direction, each fitting hole 34 (34A, 34B, 34C, 34D). The intervals L1, L2, and L3 can be freely adjusted, and even if there is a molding distortion at the time of molding by an injection molding machine (not shown), the total length L can be easily adjusted by adjusting the length based on the deformation of each expansion / contraction deformation part 40. It is possible to optimize. Thus, when the shock absorbing member EA is set on the set surface 54A of the support 54 in the apparatus 50 described above, the shock absorbing member EA is appropriately pulled or compressed in the longitudinal direction as illustrated in FIG. However, by adjusting the distances L1, L2, L3 between the respective fitting holes 34 (34A, 34B, 34C, 34D), the fitting holes 34 (34A, 34B, 34C, 34D) are adjusted to the corresponding positioning fixing pins 56 ( 56A, 56B, 56C, 56D), and the shock absorbing member EA can be set on the support 54 without causing internal stress.

  Accordingly, the shock absorbing member EA attached and fixed to the back surface 20B of the molded ceiling member 20 based on the processes illustrated in FIGS. 12 to 14 is almost free when it is removed from the support 54 because no internal stress remains. Does not deform. That is, when the shock absorbing member is attached and fixed to the back surface 20B of the molded ceiling member 20, no internal stress is generated in the shock absorbing member EA, so that the molded ceiling member 20 after the fixing is removed from the main body 52 of the apparatus 50. In addition, distortion due to bending deformation or torsional deformation does not occur. Accordingly, there is no inconvenience that wrinkles or the like are generated on the surface 20A of the molded ceiling member 20 to cause deterioration of the texture, and the molded ceiling member 20 has an appropriate shape. Accordingly, the assembly work of the molded ceiling member 20 to the vehicle body 10 can be efficiently performed.

Incidentally, the form of the extendable deformation portion 40 described above is not intended to be limited to bent shape exhibiting illustrated substantially U-shaped in FIGS. 1 and 2, based on the length adjustment of the first rib 30 As long as the overall length adjustment of the shock absorbing member EA can be suitably performed, the configurations illustrated in FIGS. 7 and 8 may be used. For example, FIG. 7 is an illustration of a stretch deformation portion 40 which is the opening direction has semicircular bay song shape crossing the longitudinal direction of the first rib 30, the longitudinal direction with respect to the first rib 30 When an external force along is applied, the curved portion (arc portion) is deformed and the opening interval is changed, so that expansion / contraction deformation is expressed. The 8 an illustration of a stretch deformation portion 40 of generally V-shaped bent shape which opens in a direction intersecting the longitudinal direction of the first rib 30, the longitudinal direction with respect to the first rib 30 When an external force along is applied, the bent portion is deformed and the opening interval is changed, so that expansion / contraction deformation is expressed.

  In the above-described embodiment, the shock absorbing member EA disposed on the side portion of the driver's seat in the roof side portion is illustrated. However, the shock absorbing member targeted by the present application is the side of the passenger seat in the roof side portion 14. And those disposed on the left and right side portions of the rear seat in the roof side portion 14.

  Further, the impact absorbing member targeted by the present application is not limited to the one disposed inside the roof side portion 14 described above, and the portion facing the passenger compartment 18, for example, the one disposed inside the pillar portion, etc. included.

  An impact absorbing member according to the present invention has a long rib structure including a first rib extending along a longitudinal direction and a plurality of second ribs intersecting the first rib, and is provided in a passenger compartment of a vehicle. It is arranged inside the facing part and can be implemented in various types of automobiles such as passenger cars.

It is the schematic perspective view which showed the whole shape of the impact-absorbing member which concerns on a suitable Example. It is the elements on larger scale of FIG. It is explanatory drawing which illustrated the form and deformation | transformation aspect of the expansion-contraction deformation part. It is explanatory drawing which showed that expansion-contraction deformation | transformation deform | transforms by contraction by applying a force so that an impact-absorbing member may be compressed along a longitudinal direction. It is explanatory drawing which showed that expansion-contraction deformation deform | transforms by applying force so that it may pull an impact-absorbing member along a longitudinal direction. It is explanatory explanatory drawing which showed the state which sets an impact-absorbing member to the set surface of the support body in an apparatus, adjusting length. It is explanatory drawing which illustrated the expansion-contraction deformation part of another form. Furthermore, it is explanatory drawing which illustrated the expansion-contraction deformation part of another form. It is the schematic perspective view which showed the side part of the driver's seat in the roof side part of a vehicle body in the state which abbreviate | omitted the vehicle body structural member. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is a schematic perspective view which shows the whole shape of the conventional impact-absorbing member. It is a schematic explanatory drawing of the apparatus used in order to attach and fix an impact-absorbing member on the back surface of a molded ceiling member. It is explanatory drawing which showed the state which sets a molded ceiling member to the main body of an apparatus, and sets an impact-absorbing member to a support body. It is explanatory drawing which showed the state which rotates a support body, presses an impact-absorbing member on the back surface of a shaping | molding ceiling member, and attaches and fixes this impact-absorbing member with adhesives, such as a hot melt. FIG. 12 is an explanatory perspective view illustrating a state in which the conventional shock absorbing member illustrated in FIG. 11 is set on the set surface of the support in the apparatus.

Explanation of symbols

14 Roof side part 20 Molded ceiling member (vehicle interior member)
30 1st rib 32 2nd rib 40 Expansion / contraction deformation part (deformation part)
42 Length adjustment area 44 General area

Claims (2)

A first rib (30) extending along the longitudinal direction and a plurality of second ribs (32) intersecting with the first rib (30) are integrally formed in a lattice shape to form a long rib structure. Presented, an impact absorbing member (EA) disposed between the vehicle body (10) facing the passenger compartment of the vehicle and the vehicle interior member (20) ,
A fitting hole for fitting the impact absorbing member (EA) to a positioning and fixing pin (56) protruding from a device (50) used when attaching and fixing the rear surface (20B) of the vehicle interior member (20). (34) in the shock absorbing member (EA) respectively drilled in the wall portion formed in the rectangular portion defined by the first rib (30) and the second rib (32) ,
Said first rib (30) between the fitting hole (34), to allow for expansion and contraction deformation along the longitudinal direction of the first rib (30), opened in a direction crossing the longitudinal direction Provide a bent or curved shape part (40),
The bent or curved portion (40) has the same width (W1) as the width (W) of the first rib (30) connected to the bent or curved portion (40). An impact-absorbing member characterized by being made . The vehicle interior member (20) is impact-absorbing member of claim 1, wherein a molded ceiling member.

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