JP2010023708A - Support structure and interior trim member for automobile equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure capable of reliably supporting a reinforcement member with a low contact pressure and inhibiting a noise generation and an interior trim member for automobile equipped with the same. <P>SOLUTION: The support structure 1 includes a front plate 2, a rear plate 3, and a reinforcing member 4. The rear plate 3 is arranged to oppose the front plate 2, and provided with a groove 12 on an opposed surface 17 facing the front plate 2. The reinforcing member 4 extends between the groove of the rear plate 3 and the front plate 2. The groove 12 of the rear plate 3 is formed by a pair of ridge lines 23, which alone oppose each other, in a cross section perpendicular to a direction in which the reinforcement member 4 extends. At the cross section, the reinforcement member 4 is secured immovably in the width direction and the height direction of the groove 12, by contacting the front plate 2 at a single contact point 24 and contacting the pair of the ridge lines 23 of the rear plate 3 at two contact points 25, 26. Furthermore, in other cross sections, the reinforcing member 4 is movably held in the width direction and the height direction of the groove 12, because of its being able to contact at least one of the front plate 2 and the groove 12 of the rear plate 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a support structure and an automobile interior member including the support structure.

  2. Description of the Related Art Conventionally, a hollow molded product having a structure supported by a plurality of support members, in particular, a blow molded hollow molded product has been widely used for an automobile deck board or the like. As an advantage of adopting the hollow molded article, it is possible to reduce the weight because the inside is hollow even if the deck board has a predetermined thickness.

  In the case of producing a hollow molded article by blow molding, first, a thermoplastic resin plasticized by heating is extruded into a cylindrical form called Paris. Then, the upper and lower sides of the parison are sealed and air is blown into the inside, and the parison is pressed with a male-male pair mold having a required shape. Further, the pressure is applied by air to press the Paris against the mold surface. By cooling the parison, a required hollow molded article having a hollow portion surrounded by the front plate, the back plate, and the outer peripheral standing wall plate, which are support members, is obtained. In this hollow molded product, it is often performed that a skin material such as a nonwoven fabric is stuck on the design surface at the same time as molding or after molding.

  However, the hollow molded product is lightweight, but is easily deformed when subjected to a load because it is hollow inside. In order to suppress this deformation, if necessary, the distance between the two plates is regulated by joining the front and back plates partially (in the form of dots, lines, or planes) between the outer peripheries of Paris. To be done. This joining between the two plates increases the strength of the entire hollow molded article.

  In particular, when a heavy load is placed on a structure such as a large hollow molded product or an automobile deck board, a plurality of reinforcing members can be provided to reinforce the structure. Much done. As the reinforcing member, a long pipe having a circular cross section (for example, a steel pipe), a pipe having a square cross section, or the like is used. As a method for supplying the reinforcing member, after forming the hollow molded product, a part of the outer wall of the molded product is cut out and the reinforcing member is inserted into a predetermined position (see Patent Document 1), or the reinforcing member is sandwiched and molded simultaneously with the molding. There is a way to do it. For example, Patent Documents 2 to 4 disclose techniques relating to positioning of a reinforcing member in a hollow molded article. In these patent documents, a technique for restricting the position of the reinforcing member by giving a required shape to the front plate or the back plate and further bringing the front plate and the back plate into contact with the outer periphery of the reinforcing member is disclosed. .

  In this kind of support structure of the reinforcing member disposed in the hollow molded article, there is a problem of abnormal noise caused by the contact between the reinforcing member and the hollow molded article. This abnormal noise is a relatively high-pitched sound when a slight deformation occurs in the hollow molded product (for example, when a heavy load is placed on a car deck board).

  Conventionally, the cause and the solution of the abnormal noise have not been sufficiently studied. Therefore, as a result of intensive studies by the inventor of the present invention, it has been found that the cause of the abnormal noise is a peeling sound when the contact of the front plate or the back plate in contact with the reinforcing member is separated from the reinforcing member. In particular, it has been found that when the contact pressure at the contact portion increases, the front plate or back plate and the surface of the reinforcing member come into close contact with each other, and a click sound is heard when they are peeled off.

Further, as a result of repeating the experiment, it was found that the boundary value of the contact pressure for generating the peeling noise was 281 N / mm ² , and no peeling noise was generated at a contact pressure less than this value. This boundary value varies depending on the combination of the material and the surface condition (painting, etc.) of at least one of the front plate and the back plate of the hollow molded product and the reinforcing member. At least, the combination of the most common polypropylene resin and unpainted steel pipe is completely reproducible. It has been found that other material combinations generally hold. The combination of materials confirmed this time is when the reinforcing member is Fe, Al, or Ti, and the plate is polypropylene resin, modified PPO resin, ABS resin, AES resin, or HIPS resin.

Therefore, as a method for suppressing abnormal noise (peeling noise), the contact pressure at the contact point between at least one of the front plate and the back plate and the reinforcing member may be reduced to less than 281 N / mm ² . If the purpose is only to suppress peeling noise, the lower the contact pressure, the better the purpose.
JP 2006-205686 A Japanese Utility Model Publication No. 63-51719 Japanese Patent No. 2552642 Japanese Patent No. 3472460

However, the reinforcing member needs to be supported by a pressure of 30 N / mm ² or more, and when the supporting pressure is 0 N / mm ² or less, that is, when both the plates and the reinforcing member are not in contact with each other, a rattling noise may occur. There is also.

  In the conventional design considering such abnormal noise generation, it is difficult to control the contact pressure between the two plates and the reinforcing member. The reason will be described with reference to FIG. 6 (see Patent Document 2). First, when the annular reinforcing member 6 is viewed in cross section, the periphery thereof is surrounded by an outer wall 21 corresponding to a back plate having little flexibility and a lower surface 22 corresponding to a front plate. Yes. That is, the reinforcing member 6 and the lower surface 22 and the outer wall 21 are in contact with each other at four contact points. Further, the lower surface 22 and the outer wall 21 are in contact with each other over the entire length of the reinforcing member 6. As a result, even if at least one of the outer wall 21 and the lower surface 22 becomes thicker, for example, by about 0.5 mm due to manufacturing errors, these members are not easily deformed. Therefore, the reinforcing member 6 and the outer wall 21 and the lower surface 22 The contact pressure between the contacts tends to increase rapidly.

  Another is that a large number of grooves 24 a and 24 b are formed in the upper surface 23 corresponding to the back plate at short intervals along the longitudinal direction of the reinforcing member 6. If the interval between the groove portions 24a and 24b where the outer wall 21 and the lower surface 22 are joined to both sides is narrow, the outer wall 21 and the lower surface 22 are not easily deformed as described above. For this reason, it has been found by experiments of the inventors that a portion where the contact pressure between these components 21 and 22 and the reinforcing member 6 is extremely high is likely to occur. In Patent Document 2, this increase in contact pressure is not considered.

  The present invention has been made in view of the above circumstances, and provides a support structure capable of reliably supporting a reinforcing member with a low contact pressure and suppressing the generation of abnormal noise, and an automotive interior member including the same. With the goal.

  The support structure of one embodiment of the present invention includes a plate-like first support member, and a second support member that is disposed to face the first support member and has a groove on the surface facing the first support member. And a reinforcing member extending between the groove portion of the second supporting member and the first supporting member, and the groove portion of the second supporting member is mutually in a cross section orthogonal to the extending direction of the reinforcing member. The reinforcing member is formed of only a pair of opposing ridge lines, and the reinforcing member is, in one section, a groove portion by contacting the first support member at one contact point and contacting the pair of ridge lines of the second support member at two contact points. And the reinforcing member can be in contact with at least one of the first support member and the groove portion of the second support member in a cross section excluding one cross section. It is held movably in the width direction and the height direction.

  An automobile interior member of one embodiment of the present invention includes the above-described support structure.

  The reinforcing member of the support structure according to the present invention has one contact point on the front plate which is the first support member in one section of the back plate which is the second support member provided with the groove formed by the pair of ridge lines. As well as being in contact with the pair of ridge lines of the back plate with two contact points, the groove portion is held stationary in the width direction and the height direction. Further, the reinforcing member is held movably in the width direction and the height direction of the groove portion by being able to contact at least one of the groove portion of the front plate and the back plate in a cross section excluding one cross section.

  Thereby, the reinforcing member of the conventional support structure is in contact with both the front plate and the back plate over the entire length, but according to the support structure of the present invention, the reinforcing member is formed by a pair of ridge lines. Only one cross section of the back plate provided with a groove portion is in contact with both the front plate and the back plate. Furthermore, in the cross-sectional location other than this cross-section, the reinforcing member is movable in the width direction and the height direction of the groove portion by being able to contact at least one of the groove portion of the front plate and the back plate. Therefore, the contact area between the front plate and the back plate of the reinforcing member in the support structure of the present invention is reduced as compared with the conventional case. Therefore, the reinforcing member is less likely to be restrained by the front plate and the back plate, and thus is easily elastically deformed between the front plate and the back plate.

  Moreover, in the location of the back board provided with the groove part formed of a pair of ridgeline, a reinforcement member and both boards are contacting with a total of three contacts. As a result, the number of contacts is reduced by one compared to the contact by the four contact points between the reinforcing member and the front and back plates in the conventional support structure. Further, in the conventional support structure, the reinforcing member and the back plate are in contact with each other at three points. In the support structure of the present invention, the reinforcing member and the back plate are in contact with each other at two points. Therefore, when a load is applied to the support structure from the outside, the reinforcing member and the back plate come into contact with each other on the surface in the vicinity region including the contact. However, the contact pressure at the contact points on the back plate is reduced because the contact area is smaller than that in the prior art.

  Furthermore, when a load is applied to the support structure, due to the presence of a groove formed by a pair of ridge lines in the back plate and a space formed by arranging the front plate and the back plate to face each other, The back plate is easily bent and elastically deformed to the front plate side. Therefore, since the back plate is easily elastically deformed even when a dimensional error in manufacturing occurs in the reinforcing member or the back plate, the contact between the back plate and the reinforcing member is alleviated. Therefore, it is possible to prevent the contact pressure from becoming excessively high at a specific location on the back plate. Therefore, the configuration of such a support structure can reliably support the reinforcing member with a low contact pressure.

Furthermore, since the contact pressure at the contact point between at least one of the front plate and the back plate and the reinforcing member is set to less than 281 N / mm ² as described above, the generation of abnormal noise can be suppressed.

  Therefore, it is possible to provide a support structure that can reliably support the reinforcing member with a low contact pressure and suppress the generation of abnormal noise, and an automobile interior member including the support structure.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows an external view in which a support structure according to an embodiment of the present invention is applied to a deck board that is an automobile interior member. FIG. 2 shows a perspective view of the back plate constituting the support structure according to the embodiment of the present invention. FIG. 3 shows a detailed view of a support structure according to an embodiment of the present invention. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 1, and corresponds to a groove installation location formed by a pair of ridge lines of the back plate in FIG. FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB in FIG. 1, and corresponds to the low rib portion of the back plate in FIG. FIG. 3C is a cross-sectional view taken along the line IIIC-IIIC in FIG. 1 and corresponds to the position of the high collar portion of the back plate in FIG. 2 formed by joining the back plate and the front plate.

  The support structure 1 that is a hollow molded product is configured by a front plate 2 that is a first support member, a back plate 3 that is a second support member, a reinforcing member 4, and a standing wall plate (not shown). Yes. In FIG. 1, the application portion of the support structure 1 according to an embodiment of the present invention is the vertical direction in the drawing (the depth direction of the deck board and the direction perpendicular to the longitudinal axis 5 of the tubular reinforcing member 4). Although it is three places, it is not limited to this form. That is, the support structure 1 of the present invention may be provided in at least one place in at least one direction of the depth direction of the deck board and the width direction orthogonal thereto.

The flat front plate 2 is disposed on the surface 6 side of the deck board on which a heavy object is placed (see FIG. 1). A non-woven skin material (made of polyethylene fiber and having a weight of 350 g / m ² per unit area) is attached to the surface 6 at the same time as molding in order to impart designability and scratch resistance. The skin material may be a woven fabric or a knitted fabric in addition to the nonwoven fabric. Furthermore, a form in which the skin material is not attached is also possible.

  The back plate 3 is disposed on the back side of the deck board opposite to the front surface 6 shown in FIG. As shown in FIG. 2, the back plate 3 includes a low collar part 7, a high collar part 8, a flat part 11, and a groove part 12.

  The low collar portion 7 and the high collar portion 8 extend in the longitudinal direction of the back plate 3 (the direction along the longitudinal axis 5 of the reinforcing member 4). Each low collar portion 7 is formed in a long rectangular parallelepiped shape due to the shape of the groove portion 12 and the flat portion 11. Each of the high collar portions 8 has a height of the collar higher than that of each of the low collar portions 7, and is disposed between the respective low collar portions 7 in the longitudinal direction of the groove portion 12. Each of the high collar portions 8 shown in FIG. 2 has an elliptical cross section, but is not limited to this shape, and may be formed in a circular shape or a polygonal shape. It is preferable that the length of each collar part 7 and 8 is 15-30 mm, and it is preferable that the width | variety is 3-10 mm. Note that the length of the flange portions 7 and 8 affects the rigidity in the lateral direction (width direction) of the deck board as a product. When the collar parts 7 and 8 are long, the rigidity is strong, and when the collar parts 7 and 8 are short, the rigidity tends to be weak. Further, the width of the flanges 7 and 8 affects the rigidity in the vertical direction (depth direction) of the product. When the distance between the low collar part 7 and the high collar part 8 is wide, the rigidity is strong, and when the distance is narrow, the rigidity tends to be weak. The distance is preferably 30 to 300 mm, and the distance between the low collar part 7 and the high collar part 8 is determined so that the reinforcing member 4 is reliably supported in accordance with the required specifications of the support structure 1. Further, with regard to this distance, the distance between the heights 8 is an important numerical value. The concave portion 13 of the groove 12 shown in FIG. 2 (corresponding to the location of the opposing surface 17 having a pair of ridges 23 as shown in FIG. 3A and corresponding to the location where the two contacts 25 and 26 are formed) First, a case where it is in the middle of two adjacent high eaves portions 8 is assumed. In this case, the distance between the high collar portions 8 is L when the distance between the end of each high collar portion 8 and each contact point 25, 26 on the pair of ridges 23 is L (see FIG. 2). It is twice the distance. On the other hand, the case where a pair of ridgeline 23 on the opposing surface 17 is not in the middle of the two high eaves parts 8 is assumed. In this case, when the distance between the ends of the two high collar sections 8 and the pair of ridge lines 23 is long and L is the short distance, the distance between the high collar sections 8 Becomes L + L ′. As a result of the study, 2L or L + L ′ is desirably 120 mm or more. When this value is less than 120 mm, the contact pressure rises rapidly, and as a result, peeling noise is likely to occur.

  The low collar portion 7 includes a region 14 that extends in a direction parallel to the flat portion 11 from the groove portion 12, and a separation region 16 that extends in a direction orthogonal to the flat portion 11 from an edge 15 of the region 14. With such a configuration, the low collar portion 7 is formed in a U-shaped cross section. The flat part 11 extends from the separation region 16 of the low collar part 7 to the side opposite to the groove part 12 side. The groove portion 12 extends in the longitudinal direction of the back plate 3 between the plurality of flange portions 7 and 8, and is formed in a U-shaped or V-shaped cross section. A concave portion 13 is provided at one location of the groove portion 12, and a facing surface 17 having a pair of ridge lines 23 is formed on the surface on the surface side opposite to the surface on which the concave portion 13 is provided (see FIG. 3 (a)). As shown in FIG. 2, the groove 12 is arranged such that two triangular pyramid-shaped concave regions abut each other's vertices. As shown in each drawing of FIG. 3, the reinforcing member 4 is disposed in the groove 12 where the recess 13 is provided.

  The reinforcing member 4 is disposed between the front plate 2 and the back plate 3 and functions to reinforce the support of heavy objects by the front plate 2 and the back plate 3. In the support structure 1 shown in FIG. 1, three reinforcing members 4 (long pipes having a circular cross section having a length substantially equal to the width of the molded product along the width direction) are parallel to each other in the depth direction of the deck board. Has been placed. At least one reinforcing member 4 is required, and the necessary number can be applied to a required location depending on the strength required for the reinforcing member 4 and the usage. The shape of the reinforcing member 4 is most preferably circular in cross section. However, in addition to a circle, an oval shape or a substantially circular shape with a rounded corner may be used. Furthermore, a polygonal shape including a quadrangle can also be employed. About the size of the reinforcement member 4, it is preferable that an outer diameter dimension is 15.9 mm. More preferably, it is 8 to 15.9 mm. The length of the reinforcing member 4 in the longitudinal direction is preferably slightly shorter than the length of the support structure 1 (length in the width direction of the deck board). Steel is most suitable for the material of the reinforcing member 4. However, the material is not limited to this material, and a metal or resin (polyurethane resin or polyamide-based resin) other than iron can be used as the material of the reinforcing member 4 when necessary strength can be ensured. Various coatings may be applied to the outer peripheral surface 18 of the reinforcing member 4.

  The standing wall plate is a member that connects the front plate 2 and the back plate 3, and a hollow space 19 is formed by the front plate 2, the back plate 3, and the standing wall plate. Further, the standing wall plate corresponds to the outer peripheral wall of the support structure 1, and a plurality of rows of rib-like standing walls (not shown) are arranged in a direction parallel to the reinforcing member 4 at an intermediate position of the outer peripheral wall.

  The size of the support structure 1 configured as described above has a width of 840 mm, a depth length of 680 mm, and a thickness of 25 mm at 11 flat portions of the back plate 3. The thickness of the front plate 2 is 3.0 mm, the back plate 3 is 2.0 mm, and the standing wall is 2.0 mm. The distance between the front plate 2 and the back plate 3 is equal to the height of the hollow space 19 and is 20.0 mm. The back plate 3 is 33% thinner than the front plate 2, and this is formed at the same time as molding by changing the drawing ratio during molding to deepen the drawing. The method of making the thickness of the back plate 3 thinner than the thickness of the front plate 2 is not limited to the change of the drawing condition at the time of molding. That is, for example, the thickness of the back plate 3 can be controlled to be thinner than that of the front plate 2 by reducing the thickness of the Paris or adjusting the temperature at the time of molding. The material of the support structure 1 is made of PP resin, and the flexural modulus is 850 MPa. Other preferable materials include PE resin, PET resin, and PVC resin. In particular, the support structure 1 is more preferably made of a thermoplastic resin having a flexural modulus in the range of 830 to 2800 MPa.

  Next, a support structure according to an embodiment of the present invention will be described in more detail with reference to FIG. In addition, each sectional view shown in FIG. 3 is a sectional view orthogonal to the direction in which the reinforcing member 4 extends.

  In the cross section shown in FIG. 3A, the back plate 3 is disposed so as to be separated from the front plate 2 so as to face the surface 21 opposite to the surface 6 which is the design surface of the front plate 2. In this cross section, the back plate 3 includes a groove portion 12 having a facing surface 17 facing the surface 21 of the front plate 2 of the groove portion 12. The groove 12 is formed by only a pair of ridge lines 23 on the facing surface 17 that face each other across the vertex 22 and extend from the vertex 22 toward the front plate 2. In the reinforcing member 4, a pair of ridge lines 23 extending between the plurality of flange portions 7, 8 of the back plate 3 and the front plate 2 pass through the longitudinal axis 5 of the reinforcing member 4 and are orthogonal to the front plate 2. It is formed symmetrically with respect to the line. When the reinforcing member 4 comes into contact with the back plate 3 on the pair of ridge lines 23 formed in this way, the contact between the reinforcing member 4 and the back plate 3 becomes stable. Thereby, the contact pressure between the reinforcing member and the back plate can be equalized. The pair of ridge lines 23 are in contact with the outer peripheral surface 18 of the reinforcing member 4 in the vicinity of the intermediate position. The pair of ridge lines 23 on the facing surface 17 are preferably straight lines or part of a curve having a radius of curvature larger than the radius of curvature of the cross-sectional shape of the reinforcing member 4. By making the pair of ridge lines 23 into a shape of a part of this straight line or curve, the contact between the back plate 3 and the reinforcing member 4 can be made dotted. Therefore, excessive adhesion between the back plate 3 and the reinforcing member 4 can be avoided. The thickness of the back plate 3 is preferably 33% of the surface thickness. However, the thickness of the back plate 3 may be 5% or more smaller than the thickness of the front plate 2 without being limited to this value. Further, the back plate 3 is connected to the pair of ridge lines 23 on both sides in the width direction of the groove portion 12 and is connected to the lower ridge portion 7 closer to the front plate 2 than the pair of ridge lines 23, and to the low ridge portion 7. A flat portion 11 that is farther from the front plate 2 than the portion 7. About the height and width of the low collar part 7, according to the outer diameter of the reinforcement member 4 included, it is suitable that these heights and widths are about 0.5 mm and larger than the outer diameter dimension of the reinforcement member 4. . Thereby, it is desirable that the low collar portion 7 and the reinforcing member 4 do not contact each other.

  Next, the contact relationship between each component in the support structure which concerns on this invention is demonstrated in detail. First, in the cross section shown in FIG. 3 (a), the outer peripheral surface 18 of the reinforcing member 4 in the support structure 1 is in contact with the surface 21 of the front plate 2 at one contact 24 and the opposing surface 17 of the back plate 3. The upper pair of ridges 23 are in contact with the two contact points 25 and 26. Accordingly, the reinforcing member 4 is held immovably in the width direction and the height direction of the groove portion 12 of the back plate 3 by the front plate 2 and the back plate 3. The two contact points 25 and 26 are formed by contact between the groove portion 12 formed by pushing the flat portion 11 of the back plate 3 in the direction of the apex 22 from both ends and the reinforcing member 4. A pair of ridge lines 23 at each of the two contact points 25 and 26 of the back plate 3 are inclined at a relative angle of less than 45 degrees with respect to a tangent line of the surface 21 of the front plate 2 at one contact point 24 of the front plate 2. ing. The opposing surface 17 including the pair of ridge lines 23 may be in surface contact (interference) with the outer peripheral surface 18 of the reinforcing member 4 instead of point contact. With respect to the contact thickness (interference amount) of both members in the diameter direction of the reinforcing member 4, the nominal dimension in design is preferably 0 mm to 1.5 mm. Furthermore, it is more preferable to set to 0.3 mm to 1.3 mm in consideration of an error of the actual product. In practice, when there is an interference part due to such surface contact, the opposing surface 17 including the pair of ridge lines 23 bends in the direction of the front plate 2, so that when a load is applied from the outside, the back plate 3 and the reinforcing member 4 can be absorbed.

  Next, in the cross section shown in FIG. 3 (b), the front plate 2 and the back plate 3 are not in contact with each other. The height is reduced, and a low collar portion 7 is formed. In the low collar portion 7, the back plate 3 is spaced from the front plate 2 by 5 to 10 mm. The low collar portion 7 is formed by being sandwiched between the high collar portions 8 adjacent to the groove portion 12 side. Further, the low flange portion 7 has a function of floating the groove portion 12 of the back plate 3 contacting the reinforcing member 4 from the front plate 2 to bend easily, and bringing the surface 21 of the front plate 2 into contact with the reinforcing member 4 at a predetermined angle. Have Accordingly, the reinforcing member 4 is held movably in the width direction and the height direction of the groove portion 12 by being able to contact at least one of the front surface 21 of the front plate 2 and the groove portion 12 of the back plate 3. In addition, there is no limitation about the depth of the low collar part 7, The depth of the low collar part 7 may be set so that the angle of a pair of ridgeline 23 may become a predetermined angle.

  Further, in the cross section in FIG. 3C, the front plate 2 and the back plate 3 are joined at two points. It is enlarged and the high collar part 8 is formed. Further, in the high collar portion 8, the reinforcing member 4 may be in contact with the front plate 2 at one point and may not be in contact with the back plate 3. Furthermore, in the high collar part 8, it can also be set as the structure in which the reinforcement member 4 does not contact the front board 2 and the back board 3 at all. The function of the high collar portion 8 is to maintain the front plate 2 and the back plate 3 by a predetermined distance. If the support structure 1 is deformed due to a load, or if a load is placed on the top plate 2 of the support structure 1 applied to a car deck board, the top plate 2 The space between the back plate 3 cannot be regulated. Therefore, there is a possibility that the reinforcement member 4 cannot be supported due to the large deformation of the support structure 1. Further, the high collar portion 8 is also necessary as a mechanism for bringing the reinforcing member 4 into contact with the surface 21 of the front plate 2 with a predetermined contact pressure. On the other hand, when there are too many high flange portions 8, which are portions where the front plate 2 and the back plate 3 are joined, excessive contact pressure is likely to be generated in the portion on the surface 21 that supports the reinforcing member 4. In this way, the reinforcing member 4 is held movably in the width direction and the height direction of the groove portion 12 by being able to contact at least one of the front surface 21 of the front plate 2 and the groove portion 12 of the back plate 3. .

  As described above, the reinforcing member 4 of the support structure 1 according to the present invention has the first cross section of the back plate 3 that is the second support member provided with the groove portion 12 formed by the pair of ridge lines 23. By making contact with the front plate 2, which is a supporting member, with one contact 24, and by making contact with the pair of ridges 23 of the back plate 3 with two contacts 25, 26, the groove portion 12 is held immovably in the width direction and height direction. ing. Further, the reinforcing member 4 is held movably in the width direction and the height direction of the groove portion 12 by being capable of contacting at least one of the front plate 2 and the groove portion 12 of the back plate 3 in a cross section excluding one cross section. Yes.

  Thereby, although the reinforcement member of the conventional support structure has contacted both the front board and the back board over the full length, according to the support structure 1 of this invention, the reinforcement member 4 is a pair of ridgeline 23. It is in contact with both the front plate 2 and the back plate 3 with only one cross section of the back plate 3 provided with the groove portion 12 formed in (1). Further, at a cross-sectional location other than this cross-section, the reinforcing member 4 can contact at least one of the front plate 2 and the groove 12 of the back plate 3 so that the groove 12 can be moved in the width direction and the height direction. ing. Therefore, the contact area of the reinforcing member 4 with the front plate 2 and the back plate 3 in the support structure 1 of the present invention is reduced as compared with the conventional case. Therefore, the reinforcing member is less likely to be restrained by the front plate and the back plate, and thus is easily elastically deformed between the front plate and the back plate.

  Moreover, in the location of the back plate 3 provided with the groove portion 12 formed by the pair of ridge lines 23, the reinforcing member 4 and the two plates are in contact with each other at a total of three contact points. As a result, the number of contacts is reduced by one compared to the contact by the four contact points between the reinforcing member and the front and back plates in the conventional support structure. Further, in the conventional support structure, the reinforcing member and the back plate are in contact with each other at three points, but in the support structure 1 of the present invention, the reinforcing member 4 and the back plate 3 are in contact with each other at two points. Therefore, when a load is applied to the support structure 1 from the outside, the reinforcing member 4 and the back plate 3 come into contact with each other on the surface in the vicinity region including the contacts 25 and 26. However, the contact pressure at the contact points on the back plate is reduced because the contact area is smaller than that in the prior art.

  Further, when a load is applied to the support structure 1, the groove portion 12 formed by the pair of ridge lines 23 in the back plate 3, and the front plate 2 and the back plate 3 are arranged to face each other. Due to the presence of the space 19, the back plate is easily bent and elastically deformed to the front plate side. Therefore, since the back plate is easily elastically deformed even when a dimensional error in manufacturing occurs in the reinforcing member or the back plate, the contact between the back plate and the reinforcing member is alleviated. Therefore, it is possible to prevent the contact pressure from becoming excessively high at a specific location on the back plate. Therefore, the configuration of such a support structure can reliably support the reinforcing member with a low contact pressure.

Next, the contact pressure generated at the contact point between the reinforcing member 4 and the back plate 3 will be described more specifically with reference to FIG. FIG. 4A is an explanatory diagram showing the interrelationship between the contact pressure P ₀ generated by the contact between the back plate 3 and the reinforcing member 4, the vertical component P ₁ and the horizontal component P ₂ thereof. FIG. 4B is an explanatory diagram showing changes of the contact pressure P ₀ , the vertical component P ₁ , and the horizontal component P ₂ of FIG. 4A with respect to the ridge line inclination angle.

The contact pressure P ₀ generated at the two contact points 25, 26 of the back plate 3 acts in a direction orthogonal to the pair of ridge lines 23. The contact pressure P ₀ includes a vertical component P ₁ that is perpendicular to the ridge line at one contact 24 of the front plate 2 and a horizontal component P ₂ that is orthogonal to the vertical component P ₁ . As shown in FIG. 4, the vertical component P ₁ larger than the horizontal component P _2, the contact pressure P ₀ is less than 281N / mm ^2, the vertical component P ₁ is less than 245 N / mm ^2, and a horizontal component P ₂ is 200 N / it is preferably in the range below mm ^2. Further, more preferably _{^{84N / mm 2 <P 1 <}} 236N / mm 2 and a horizontal component P ₂ with respect to _{^{30N / mm 2, <P 1}} <157N / mm 2 with respect to the vertical component P _1. The vertical component P ₁ can be set larger than the horizontal component P _{2 in} the support structure 1 of the present invention because the ridge lines at the two contact points 25 and 26 between the back plate 3 and the reinforcing member 4 are the front plate 2. This is based on the structural feature of being inclined at an angle of less than 45 degrees with respect to the tangent line at one contact point 24. That is, in the support structure 1 of the present invention, the horizontal component P ₂ of the contact pressure P ₀ can be reduced as compared with the conventional structure.

Further, the contact pressure P ₀ with reference to FIG. 5, illustrating the relationship between a peeling noise due to peeling from two plates of the reinforcing member 4. FIG. 5A is an explanatory diagram showing the relationship between the amount of interference between the reinforcing member 4 and the back plate 3 and the presence or absence of peeling noise with respect to the contact pressure. FIG. 5B is an explanatory diagram showing the influence of the distance between the high collar portion 8 and the two contact points 25 and 26 on the back plate 3 on the generation of peeling noise.

As shown in FIG. 5 (a), it was found from the experimental results that peeling noise is likely to occur when the contact pressure P ₀ is 281 N / mm ² or more. Accordingly, the design is made so that the contact pressure is less than 281 N / mm ^{2 in the} state where the reinforcing member 4 and the back plate 3 interfere with each other with the designed interference amount of 0.8 mm.

However, in the actual product, it is inevitable that a slight error occurs in the thickness and shape of the component. From the experimental value based on the experiment, it is considered that the error of the interference amount due to this error does not exceed ± 0.5 mm with respect to the design value at the maximum. Therefore, even when the interference amount is 0.3 mm at the minimum value and 1.3 mm at the maximum value, the risk of generating abnormal noise can be eliminated by designing the contact pressure to be less than 281 N / mm ^2. I understand.

In the four-point support form of the prior art when the same material configuration as that of the support structure according to the embodiment of the present invention is adopted, when the amount of interference between the back plate and the reinforcing member becomes large, the contact pressure is increased. because the gradient is greater had gotten a 281N / mm ² or more is a boundary value of noise generation. It has been difficult for a conventional support structure to be designed to be less than this boundary value.

On the other hand, in the support structure according to the embodiment of the present invention, since the gradient of increase in the contact pressure with respect to the increase in the interference amount is gentle, the interference amount between the back plate and the reinforcing member is 1.3 mm which is the maximum value. Even so, the contact pressure is less than 281 N / mm ² . The reason why the contact structure according to an embodiment of the present invention has a gentler increase in contact pressure is as follows: (1) The ridgeline is lifted at the lower ridge, and the front and back plates are placed near the ridgeline. There is no constrained joint point, and the ridgeline is easily bent and deformed. (2) Even when the interference of the reinforcing member to the left or right ridgeline on the back plate increases, the back plate can be deformed in the direction of the opposite ridge line. It has been considered that there is an effect of equalizing the pressure, and (3) the horizontal component P ₂ of the contact pressure P ₀ can be particularly difficult to increase due to the inclined ridgeline.

As described above, in the support structure according to one embodiment of the present invention, the contact pressure at the contact point between at least one of the front plate and the back plate and the reinforcing member is set to be less than 281 N / mm ² , Generation of abnormal noise can be suppressed.

  Therefore, it is possible to provide a support structure that can reliably support a reinforcing member with a low contact pressure and can suppress the generation of abnormal noise and an automobile interior member including the support structure according to the embodiment of the present invention. it can.

It is the external view which applied the support structure which concerns on one Embodiment of this invention to the deck board which is an interior member for motor vehicles. It is a perspective view which shows the backplate which comprises the support structure which concerns on this invention. 3A is a cross-sectional view taken along the line IIIA-IIIA in FIG. 1, and corresponds to a groove installation location formed by a pair of ridge lines of the back plate in FIG. FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB in FIG. 1, and corresponds to the low rib portion of the back plate in FIG. FIG. 3C is a cross-sectional view taken along the line IIIC-IIIC in FIG. 1 and corresponds to the position of the high collar portion of the back plate in FIG. 2 formed by joining the back plate and the front plate. (A), the contact pressure P ₀ caused by contact with the back plate and the reinforcing member is an explanatory diagram showing the interrelationship of the vertical component P ₁ and the horizontal component P _2. (B) is an explanatory diagram showing a change with respect to the contact pressure P _0, ridge inclination angle of the vertical component P _1, and a horizontal component P ₂ of (a). (A) is explanatory drawing which shows the relationship between the presence or absence of peeling sound generation | occurrence | production with respect to the amount of interference between a reinforcement member and a backplate, and contact pressure. (B) is explanatory drawing which shows the influence which the distance between a high collar part and two contacts in a back plate has on peeling sound generation | occurrence | production. It is the perspective view and sectional drawing which show the conventional support structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support structure 2 Front plate 3 Back plate 4 Reinforcement member 5 Longitudinal axis 6 Surface 7 Low collar portion 8 High collar portion 11 Flat portion 12 Groove portion 13 Recessed portion 14 Region 15 Edge 16 Separation region 17 Opposing surface 18 Outer peripheral surface 19 Hollow space 21 Surface 22 vertices 23 ridgelines 24 1 contact point 25, 26 2 contact points

Claims (9)

A plate-like first support member;
A second support member disposed opposite to the first support member and having a groove provided on a surface facing the first support member;
A reinforcing member extending between the groove portion of the second support member and the first support member;
Have
The groove portion of the second support member is formed by only a pair of ridge lines facing each other in one cross section orthogonal to the extending direction of the reinforcing member,
In the cross section, the reinforcing member is in contact with the first support member at one contact point, and is in contact with the pair of ridge lines of the second support member at two contact points. The immobilization member is held stationary in the height direction, and the reinforcing member is capable of contacting at least one of the first support member and the groove portion of the second support member in a cross section excluding the one cross section. The groove is held movably in the width direction and the height direction,
Support structure.   The support structure according to claim 1, wherein a relative angle formed between each tangent at the two contact points and the first support member is less than 45 degrees.   The contact pressure of the second support member at each of the two contact points is such that a vertical component in a direction perpendicular to the first support member is larger than a horizontal component orthogonal to the vertical component in the one cross section. The support structure according to claim 1 or 2. The contact pressure is less than 281N / mm ^2, wherein the vertical component is less than 245 N / mm ^2, and the horizontal component is in the range of less than 200 N / mm ^2, the support structure according to claim 3.   5. The support structure according to claim 1, wherein the pair of ridge lines are formed symmetrically with respect to an imaginary line that passes through a longitudinal axis of the reinforcing member and is orthogonal to the first support member. 6. .   The second support member is connected to the pair of ridge lines on both sides in the width direction of the groove portion in the one cross section, and the flange portions closer to the first support member than the pair of ridge lines, The support structure according to any one of claims 1 to 5, further comprising a flat portion connected to the flange portion and farther from the first support member than the flange portion. The flange portion of the second support member has a cross section excluding the one cross section, and a plurality of high flange portions joined to the first support member, and a plurality of low ribs spaced from the first support member. And
When the distance between each of the plurality of high collar portions and each of the two contact points on the pair of ridge lines is L, 2L is 120 mm or more.
The support structure according to claim 6.   The support structure according to any one of claims 1 to 7, wherein a plate thickness of the second support member is 5% or more thinner than a plate thickness of the first support member.   The interior member for motor vehicles provided with the support structure of any one of Claim 1 to 8.

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