JP5159291B2 - Fastening structure of resin parts - Google Patents

Description

  The present invention relates to a fastening part structure for resin parts, and more particularly to a fastening part structure for resin parts in which a collar is hot-pressed into an insertion hole of the resin parts.

  In recent years, in the field of transportation machinery such as automobiles, lightweight and easy-to-mold resin parts have been replaced and applied to components that used metal parts to reduce the overall structure and increase the degree of freedom in shape design. Many efforts are being made to improve the quality of life. In particular, recently, research and development on engineering plastics has been accelerated, and material properties such as strength and environmental resistance have been greatly improved, and the movement of such material replacement is rapid.

  However, since the rigidity and strength of resin parts have certain limits, it is necessary to apply a combination of metal parts to parts that require high yield strength exceeding the rigidity and strength of the resin. As described above, when a metal part is combined with a resin part and applied, it is extremely important to firmly and securely attach the metal part to the resin part in order to ensure the reliability of the whole part. .

In view of such a situation, a recess or insertion hole for housing a metal part in a resin part is formed, and a knurled part formed of a plurality of fine grooves on a wall surface, or an unevenness formed by appropriately combining a collar part and a groove part A proposal has been made to improve the pressure-bonding force by hot-pressing a metal part having a portion into a recess or insertion hole of a resin part (see Patent Documents 1 to 3).
JP-A-8-300393 JP 11-156944 A Japanese Patent Laid-Open No. 2002-1824

  However, what is proposed in Patent Document 1 is a knurled portion formed of a plurality of fine grooves on the surface of a cylindrical metal part in a configuration in which a cylindrical metal part is hot-pressed into a housing hole of a resin injection molded product. In order to hold the metal parts that are hot-pressed into the accommodation holes more firmly, the resin melted at the time of hot-pressing is inserted into a plurality of fine grooves in the knurled portion. That is, with such a configuration, the resin that has entered into and fixed to a plurality of fine grooves in the knurled part only functions to prevent the metal parts from being removed, and the retaining strength has a certain limit.

  In addition, what is proposed in Patent Document 2 is a structure in which a cylindrical metal part is hot-pressed into an insertion hole of a resin part such as a thermostat of a thermostat, and a plurality of fine grooves are formed on the surface of the cylindrical metal part. And a plurality of groove-shaped recesses, and the resin melted at the time of hot pressing is allowed to enter into the plurality of fine grooves of the knurled part and also into the plurality of groove-shaped recesses, and into the receiving hole. It is the structure which is going to hold | maintain the metal component hot-pressed more firmly. With such a configuration, it is possible to hold a metal part that is hot-pressed into the insertion hole more firmly than the configuration proposed in Patent Document 1, but a plurality of groove-shaped recesses are formed in addition to the knurled portion. This is complicated and there is room for improvement in terms of manufacturing process and cost.

  In addition, what is proposed in Patent Document 3 is a structure in which a stepped cylindrical metal part is hot-pressed into an insertion hole of a resin molded product, and a plurality of fine grooves are formed on the surface of each recess of the stepped cylindrical metal part. And a plurality of flanges for partitioning the respective recesses so that the resin melted at the time of hot press-fitting enters a plurality of fine grooves in the knurled part and the plurality of flanges are inserted into the wall of the insertion hole. It is the structure which tries to hold | maintain the metal component penetrated into the part and heat-pressed in the accommodation hole more firmly. With such a configuration, it is possible to hold a metal part that is hot-pressed into the insertion hole more firmly than the configurations proposed in Patent Documents 1 and 2, but in addition to the knurled portion, a plurality of flanges are formed. However, it is very complicated to make it stepped as a whole, and there is room for further improvement in terms of manufacturing process and cost.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a fastening structure for a resin component that can reliably prevent a collar that has been hot-pressed into an insertion hole of the resin component with a simpler configuration. And

In order to achieve the above object, the present invention provides a resin component main body that can cause creep, an insertion hole provided in the resin component main body, and a collar in which a fastening member passes through the insertion hole by being hot-pressed into the insertion hole. In the fastening part structure of the resin part provided with, the wall part of the insertion hole may cause a deformation part that deforms so as to protrude in the radial direction of the insertion hole by the creep of the resin part body, The collar has a large-diameter portion and a small-diameter portion that is continuous with the large-diameter portion and extends outward in the axial direction toward the opening end side of the insertion hole, and only the large-diameter portion is the insertion hole. while the Ru mounted and pressed by the heat press-fitted into the wall, the small diameter portion, the occurrence of the deformation portion due to the creep of the resin component body without being heat pressed into the wall of the insertion hole The collar is inserted by the deforming part Characterized in that it is retained from.

  The resin component main body corresponds to the cylinder head attachment end 3 of the intake manifold 1, and the large diameter portion of the collar corresponds to the color main body portions 21 and 31.

In addition to the first feature, the present invention has a second feature that the small-diameter portion is a tapered portion that is continuous from the large-diameter portion and has a diameter that gradually decreases outward in the axial direction .

The present invention, in addition to the second feature, the small diameter portion, the third feature, further continuously from the tapered portion having a small cylindrical portion extending in the axial direction outwardly.

  According to the present invention, in addition to the second or third feature, the one end portion of the insertion hole has a tapered portion whose diameter gradually increases starting from a boundary line where the large diameter portion is connected to the tapered portion or its vicinity. It has the 4th characteristic to have.

According to the first feature of the present invention, the wall portion of the insertion hole provided in the resin component main body may cause a deformation portion that deforms so as to protrude in the radial direction of the insertion hole due to creep of the resin component main body. The collar has a large-diameter portion and a small-diameter portion that is continuous with the large-diameter portion and extends outward in the axial direction toward the opening end side of the insertion hole, and only the large-diameter portion is the wall portion of the insertion hole. a while and pressed by the heat press-Ru is mounted, the small diameter portion is to permit the generation of deformation portion due to creep of the resin component body without being heat pressed into the wall of the insertion hole, the collar, the deformable portion Since it is prevented from coming off from the insertion hole, the collar that has been hot-pressed into the insertion hole of the resin component can be reliably removed with a simpler configuration.

According to the second feature of the present invention, the small-diameter portion of the collar is a tapered portion that is continuous from the large-diameter portion of the collar and whose diameter gradually decreases outward in the axial direction. Without providing a processed portion, a concave and convex portion where a collar portion and a groove portion are appropriately formed, it is possible to reliably prevent a collar that has been hot-pressed into the insertion hole of the resin component while suppressing the manufacturing cost by a simple manufacturing process.

  According to the third feature of the present invention, the small-diameter portion of the collar further includes a small cylindrical portion that continues from the tapered portion of the collar and extends outward in the axial direction. Space can be narrowed as desired, the effect of preventing the deformed portion from being pulled out by creeping of the resin component body can be increased, and the collar press-fitted into the insertion hole of the resin component can be more reliably prevented.

  According to the fourth feature of the present invention, the one end portion of the insertion hole provided in the resin component main body is a tapered portion whose diameter gradually increases starting from a boundary line where the large diameter portion of the collar continues to the tapered portion or its vicinity. Therefore, even if the insertion hole provided in the resin component main body has a taper portion to improve the insertability of the collar, the deformation portion due to creep of the resin component main body is securely It is possible to exert an influence on the tapered portion and the small cylindrical portion, and it is possible to reliably prevent the collar that has been hot-pressed into the insertion hole of the resin component.

  Hereinafter, with reference to the drawings as appropriate, a resin part fastening portion structure according to an embodiment of the present invention will be described in detail.

  FIG. 1 is a side view of a vehicle intake manifold that is a resin component in an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along line XX of FIG. FIG. 3 is a partial cross-sectional view of the collar inserted into the insertion hole of the intake manifold according to the present embodiment, and FIG. 4 is a partial cross-sectional view of a collar according to a modification of the present embodiment.

  As shown in FIG. 1, a vehicle intake manifold 1 will be described as an example of the resin component in the present embodiment. Of course, the resin component is not limited to the intake manifold, and may be another structure as long as it has a fastening portion having a collar insertion hole to be described later in detail. Moreover, as a kind of the resin material, a composite material in which a fiber material is mixed with a resin can be used in addition to an engineering plastic such as polyamide according to specifications.

  In such a vehicle intake manifold 1, a throttle body (not shown) is fixed to a throttle body mounting end 2 and a cylinder head mounting end 3 is fixed to an engine cylinder head (not shown). In this configuration, the air that has flowed in from the throttle body mounting end 2 passes through the intake manifold 1 while adjusting the flow velocity and pressure, and flows from the cylinder head mounting end 3 to the cylinder head. Here, the intake manifold 1 has a three-piece structure including a first joining member 4, a second joining member 5, and a third joining member 6, each of which is a molded product made of resin, and the first joining member 4 and the second joining member 6. The joining member 5 and the first joining member 4 and the third joining member 6 are joined together and integrated. Of course, the intake manifold 1 is not limited to such a three-piece structure, and other joining structures may be adopted as long as the intake manifold 1 functions as an intake manifold.

  Here, a fastening member such as a bolt (not shown) is inserted into and fixed to the cylinder head mounting end 3 of the intake manifold 1 with respect to the cylinder head through a collar, which will be described in detail later. A penetrating insertion hole 10 is provided. The insertion hole 10 is not limited to being provided in the cylinder head attachment end 3, and the same configuration may be applied to the throttle body attachment end 2.

  As shown in FIG. 2, the insertion hole 10 of the cylinder head mounting end 3 is provided with a tapered portion 11 at one end of the insertion hole 10, in which the diameter of the insertion hole 10 gradually increases and expands for easy insertion of the collar. . More specifically, the tapered portion 11 has a shape in which the diameter of the insertion hole 10 gradually increases from the boundary line 12 at one end portion of the insertion hole 10 and expands. The boundary line 12 is provided with an R-shaped portion having a predetermined curvature between the wall portion of the insertion hole 10 and the taper portion 11 so that the wall portion of the insertion hole 10 changes gently into the taper portion 11. Is not to be excluded. When the R-shaped portion is thus provided, the boundary line 12 is virtual, and the position where the wall portion of the insertion hole 10 and the taper portion 11 virtually intersect is the position of the boundary line 12. In the drawing, the tapered portion 11 is provided on the cylinder head side of the insertion hole 10, but of course it is not limited to this, and the side far from the cylinder head in consideration of the balance with the fastening member and the like. It is also possible to provide a tapered portion 11 on the surface. Further, the tapered portion 11 is for simply inserting the collar, and it is not always necessary to provide the collar as long as the collar can be inserted by working with a work jig or the like.

  As shown in FIG. 3, the collar 20 to be inserted into the insertion hole 10 of the cylinder head mounting end 3 is a metal cylindrical member, and has a collar main body portion 21 which is a cylindrical portion at the center thereof. At both ends thereof, there are tapered portions 22 that are continuous from the collar body portion 21 and whose outer diameter gradually decreases. More specifically, the collar main body portion 21 has an outer diameter having a predetermined press-fitting allowance with respect to the insertion hole 10 of the cylinder head mounting end 3, and the tapered portion 22 extends from the boundary line 23 to the outside of the collar main body portion 21. It has a shape in which the diameter gradually decreases rather than the diameter. Further, an insertion hole 24 penetrating the collar 20 is provided inside the collar 20, and a fastening member for fixing the intake manifold 1 to the cylinder head is an insertion hole 10 in the cylinder head mounting end 3. After being inserted into the insertion hole 24 of the collar 20 inserted into the cylinder head, the cylinder head is tightened and the intake manifold 1 is fastened and fixed to the cylinder head. The collar 20 may be used by processing an iron pipe material, or may be used by rounding and joining an iron plate material into a cylindrical shape. Note that the boundary line 23 excludes the provision of an R-shaped portion having a predetermined curvature between the collar main body 21 and the tapered portion 22 so that the collar main body 21 gradually changes to the tapered portion 22. It is not a thing. When the R-shaped portion is provided in this way, the boundary line 23 is virtual, and the position where the collar main body portion 21 and the taper portion 22 virtually intersect is the position of the boundary line 23.

  As a modified example of the collar inserted into the insertion hole 10 of the cylinder head mounting end 3, there is a structure shown in FIG.

  As shown in FIG. 4, the collar 30 of the modified example inserted into the insertion hole 10 of the cylinder head mounting end 3 has a smaller diameter than the collar main body at both ends of the collar 20 shown in FIG. The difference is that a small cylindrical portion is additionally provided, and the other structures are the same. That is, the collar 30 is also a metal cylindrical member, and has a collar body portion 31 that is a large-diameter cylindrical portion at the center, and is continuous from the collar body portion 31 toward both ends thereof and has an outer diameter. And a small cylindrical portion 33 which is continuous from the tapered portion 32 at both ends thereof and whose outer diameter is smaller than the outer diameter of the collar main body portion 31. More specifically, the collar main body 31 has an outer diameter having a predetermined press-fitting allowance with respect to the insertion hole 10 of the cylinder head mounting end 3, and the taper portion 32 extends from the boundary line 34 to the outside of the collar main body 31. The small cylindrical portion 33 has a shape that maintains a constant outer diameter that is smaller than the outer diameter of the collar main body portion 31 from the boundary line 35. An insertion hole 36 that penetrates the collar 30 is also provided inside the collar 30, and a fastening member for fixing the intake manifold 1 to the cylinder head is an insertion hole 10 in the cylinder head mounting end 3. After being inserted into the insertion hole 36 of the collar 30 inserted into the cylinder head, the cylinder head is tightened and the intake manifold 1 is fastened and fixed to the cylinder head. The collar 30 may also be used by processing an iron pipe material, or by rounding and joining an iron plate material into a cylindrical shape. The boundary line 34 excludes the provision of an R-shaped portion having a predetermined curvature between the collar main body 31 and the taper 32 so that the collar main body 31 changes smoothly to the taper 32. It is not a thing. When the R-shaped portion is provided in this way, the boundary line 34 is virtual, and the position where the collar main body portion 31 and the taper portion 32 virtually intersect is the position of the boundary line 34. Such a situation is the same between the tapered portion 32 and the small cylindrical portion 33 also at the boundary line 35.

  The structure in which the collars 20 and 30 are inserted into the insertion hole 10 of the cylinder head mounting end 3 of the intake manifold 1 is the intake manifold 1, that is, a resin part fastening portion structure.

  Next, the effect | action of the fastening part structure of the resin component in this embodiment is first demonstrated in detail with reference to FIG.5 and 6 from the collar 20 shown in FIG.

  5 is a cross-sectional view showing a state in which the collar 20 shown in FIG. 3 is inserted into the insertion hole 10 of the cylinder head mounting end 3 of the intake manifold 1. FIG. 6 shows the intake manifold 1 from the state shown in FIG. It is sectional drawing which shows the state in which the deformation | transformation part was formed resulting from the creep around the insertion hole 10 of the cylinder head attachment edge part 3 of FIG.

  As shown in FIG. 5, the collar 20 has one end portion having the tapered portion 22 opposed to the end portion having the tapered portion 11 of the insertion hole 10 of the cylinder head mounting end portion 3, and then the tapered portion 11. It is inserted along the wall portion of the insertion hole 10 from the end portion having the insertion hole, and the insertion is completed when the entirety is accommodated in the insertion hole 10. Here, the collar 20 is heated to a high temperature by applying heat or high frequency, and the collar 20 is hot-pressed into the insertion hole 10 of the cylinder head mounting end 3 while maintaining the high-temperature state and with a predetermined press-fitting allowance. In such an insertion-completed state, the collar 20 is pressure-bonded to the wall portion of the insertion hole 10 of the cylinder head mounting end 3, and the binding force received from the insertion hole 10 side is mainly applied to the collar main body 21 portion. Yes. In such an insertion completion state, the position of the boundary line 12 where the tapered portion 11 where the diameter of the insertion hole 10 of the cylinder head mounting end 3 gradually increases and expands and the diameter of the collar main body portion 21 of the collar 20 are the same. The position of the boundary line 23 where the taper portion 22 gradually decreases starts to substantially coincide with the tolerance range. Here, the position of the boundary line 12 and the position of the boundary line 23 coincide with each other within the tolerance range. In detail, the position of the boundary line 12 is the position of the boundary line 23 in consideration of the retaining characteristics of the collar 20 described later. Or the position of the boundary line 12 is set so as to vary more in the vicinity of the outer side of the insertion hole 10 than the position of the boundary line 23. Further, when the insertion is completed, both end portions of the collar 20 and both end portions of the cylinder head mounting end portion 3 corresponding to them are in the surface positions.

  When the collar 20 as shown in FIG. 5 is inserted into the insertion hole 10 of the cylinder head mounting end 3 by hot-pressing, the collar body 21 is inserted through the wall of the insertion hole 10. This means that a binding force is acting, and this means that a compressive force is acting on the cylinder head mounting end 3 from the wall of the insertion hole 10. In the state where the collar 20 is inserted into the insertion hole 10 of the cylinder head mounting end 3 as described above, that is, in a state where the cylinder head mounting end 3 receives a compressive force from the wall portion of the insertion hole 10, 1 is mounted on a vehicle as a finished product and used over time. Then, due to the change with the passage of time, deformation due to creep occurs around the insertion hole 10 of the Linder head mounting end 3.

  FIG. 6 shows a state of deformation around the insertion hole 10 of the end portion 3 of the Linda head mounting due to such creep. As shown in FIG. 6, deformation due to creep occurs around the insertion hole 10 of the Linder head mounting end 3, and upper and lower deformed portions 3 a and 3 b are formed toward the tapered portion 22 of the collar 20. In other words, the deformable portions 3 a and 3 b extend in a space between the wall portion of the insertion hole 10 and the tapered portion 22 of the collar 20, and the collar 20 has the tapered portion 22, so that its formation is allowed. It is what is done.

  In FIG. 6, the upper deformable portion 3 a is located at the boundary line 12 where the tapered portion 11 starts when the diameter of the insertion hole 10 of the cylinder head mounting end 3 gradually increases and expands when the collar 20 is completely inserted. Since the position of the boundary line 23 where the tapered portion 22 where the diameter of the collar main body portion 21 of the collar 20 gradually decreases starts within the tolerance range, the cylinder head mounting end 3 is substantially matched. It is formed so as to be deformed along the tapered portion 22 of the collar 20 above the boundary line 12 where the tapered portion 11 starts from the wall portion of the insertion hole 10, and presses the tapered portion 22 of the collar 20. Give bondage power. In this state, if a load is applied that causes the collar 20 to be pulled upward, the collar main body portion 21 and the taper portion 22 move upward and try to come out of the insertion hole 10. The surrounding deformed portion 3a is deformed by receiving stress in the shear direction. This means that the collar body 21 and the tapered portion 22 receive a downward resistance force in the drawing from the deformable portion 3a, and the collar 20 has a binding force received from the wall portion of the insertion hole 10 and the tapered portion 11. Thus, the shearing force is received from the deformed portion 3a in the lower part of the drawing, and the insertion hole 10 is prevented from being pulled out. Here, since the deformation amount of the deformation portion 3a communicates with the taper portion 11 whose diameter is enlarged above the insertion hole 10, the collar 20 has the taper portion 22, and the taper portion 11 of the insertion hole 10 Considering that the distance from the tapered portion 22 of the collar 20 is increased, the space between the tapered portion 11 and the collar 20 is set to be filled at a predetermined level necessary for preventing the collar 20 from being removed.

  On the other hand, since the lower deformed portion 3b in FIG. 6 is not provided with a taper portion below the insertion hole 10 of the cylinder head mounting end portion 3, when the collar 20 is completely inserted, the taper portion of the collar 20 is simply provided. 22 is formed so as to be deformed along the belt 22 and gives a binding force for pressing the tapered portion 22 of the collar 20. In this state, if a load is applied that causes the collar 20 to fall downward, the collar main body portion 21 and the taper portion 22 move downward and try to come out of the insertion hole 10. The surrounding deformed portion 3b is deformed by receiving stress in the shear direction. This means that the collar body 21 and the tapered portion 22 receive the upward resistance force in the drawing from the deformable portion 3b, and the collar 20 has a binding force received from the wall portion of the insertion hole 10 and the tapered portion 11. Thus, the shearing force from the upper part in the figure is received from the deformed portion 3b, and the insertion hole 10 is prevented from being pulled out. Here, since the amount of deformation of the deforming portion 3 b is not provided with a taper portion below the insertion hole 10, the space between the wall portion of the insertion hole 10 and the collar 20 is a predetermined amount necessary for retaining the collar 20. It is enough to set it to fill at the level of. Further, since the space between the insertion hole 10 and the collar 20 in the deformable portion 3b is narrower than that of the upper deformable portion 3a, the shear resistance that the collar 20 receives from the deformable portion 3b is the upper deformable portion. The value is larger than that received from 3a.

  Next, the effect | action of the fastening part structure of the resin component in this embodiment is demonstrated in detail with reference to FIG.7 and 8 about the collar 30 of the modification shown in FIG.

  7 is a cross-sectional view showing a state in which the collar 30 shown in FIG. 4 is inserted into the insertion hole 10 of the cylinder head mounting end 3 of the intake manifold 1. FIG. 8 shows the intake manifold 1 from the state shown in FIG. It is sectional drawing which shows the state in which the deformation | transformation part was formed resulting from the creep around the insertion hole 10 of the cylinder head attachment edge part 3 of FIG.

  As shown in FIG. 7, the collar 30 has one end portion having the tapered portion 32 and the small cylindrical portion 33 opposed to the end portion having the tapered portion 11 of the insertion hole 10 of the cylinder head mounting end portion 3. After that, it is inserted along the wall portion of the insertion hole 10 from the end portion having the tapered portion 11, and the insertion is completed when the entirety is accommodated in the insertion hole 10. Here, the collar 30 is heated to a high temperature by application of heat or high frequency, and is hot-pressed into the insertion hole 10 of the cylinder head mounting end 3 with a predetermined press-fitting allowance, similar to the collar 20. In such an insertion-completed state, the collar 30 is pressure-bonded to the wall portion of the insertion hole 10 of the cylinder head mounting end 3, and the binding force received from the insertion hole 10 side is mainly applied to the collar body portion 31. In this insertion completion state, the position of the boundary line 12 where the diameter of the insertion hole 10 of the cylinder head mounting end 3 gradually increases and expands and the tapered portion 11 starts and the diameter of the collar body 31 of the collar 30 gradually decrease. The position of the boundary line 34 where the taper portion 32 is started substantially coincides within the tolerance range, and the setting of the tolerance is the same as that in the collar 20. Further, when the insertion is completed, both end portions of the collar 30 become surface positions with both end portions of the cylinder head mounting end portion 3 as in the case of the collar 20.

  When the collar 30 as shown in FIG. 7 is inserted into the insertion hole 10 of the cylinder head mounting end 3 by heat-pressing, the collar 30 is inserted through the wall of the insertion hole 10. This means that a binding force is acting, and this means that a compressive force is acting on the cylinder head mounting end 3 from the wall portion of the insertion hole 10. Similarly to the case of the collar 20, deformation due to creep occurs around the insertion hole 10 of the attachment end 3.

  FIG. 8 shows a state of deformation around the insertion hole 10 of the end portion 3 of the Linda head mounting due to such creep. As shown in FIG. 8, deformation due to creep occurs around the insertion hole 10 of the Linda head mounting end 3, and upper and lower deformed portions 3 c and 3 d are formed toward the tapered portion 32 and the small cylindrical portion 33 of the collar 30. The In other words, the deformable portions 3c and 3d are projected and extend into the space between the wall portion of the insertion hole 10 and the tapered portion 32 and the small cylindrical portion 33 of the collar 30, and the collar 30 has the tapered portion 32 and the small cylindrical portion. Since the portion 33 is included, the formation thereof is allowed.

  In FIG. 8, the upper deformed portion 3 c is located at the boundary line 12 where the tapered portion 11 starts when the diameter of the insertion hole 10 of the cylinder head mounting end 3 gradually increases and expands in the state where the collar 30 is completely inserted. Since the position of the boundary line 34 where the tapered portion 32 where the diameter of the collar body portion 31 of the collar 30 gradually decreases coincides within the tolerance range, the cylinder head mounting end portion 3 is substantially matched. It is deformed so as to extend along the tapered portion 32 of the collar 30 and also along the small cylindrical portion 33 continuous to the tapered portion 32 above the boundary line 12 where the tapered portion 11 starts from the wall portion of the insertion hole 10. It is formed and provides a binding force that presses the tapered portion 32 and the small cylindrical portion 33 of the collar 30. In this state, if a load is applied that causes the collar 30 to be pulled upward, the collar main body portion 31 and the tapered portion 32 move upward and try to come out of the insertion hole 10. The surrounding deformed portion 3c is deformed by receiving stress in the shear direction. This means that the collar main body 31 and the tapered portion 32 receive a downward resistance force in the drawing from the deformable portion 3c, and the collar 30 is added to the binding force received from the wall portion of the insertion hole 10 and the tapered portion 11. Thus, the shearing force in the lower part of the figure is received from the deforming part 3c, and the insertion hole 10 is prevented from being pulled out.

  Here, the deformation amount of the deformation portion 3 c is communicated with the taper portion 11 whose diameter is expanded above the insertion hole 10, and the collar 30 has the taper portion 32. As in the case of the collar 20, the distance is set in consideration of an increase in the distance from the tapered portion 32. However, since the collar 30 is provided with a small cylindrical portion 33 in addition to the tapered portion 32, the distance from the insertion hole 10 to the tapered portion 11 is correspondingly shortened at the upper end portion of the collar 30. In consideration of the above, the deformation amount of the deformation portion 3 c is set so as to fill the space between the taper portion 11 and the collar 30 at a predetermined level necessary for preventing the collar 30 from being removed. Of course, when the deformation amount of the deformation portion 3c of the collar 30 is set to be the same as the deformation amount of the deformation portion 3a of the collar 20, the space between the taper portion 11 of the insertion hole 10 and the collar 30 is a small cylindrical portion. Since the portion 33 is narrower than that in the collar 20, the binding force by which the tapered portion 32 and the small cylindrical portion 33 of the collar 30 are pressed increases, and the shear resistance force that the collar 30 receives from the deformable portion 3 c is It becomes larger and is more securely prevented from being inserted into the insertion hole 10.

  On the other hand, since the lower deformed portion 3d in FIG. 8 is not provided with a taper portion below the insertion hole 10 of the cylinder head mounting end portion 3, when the collar 30 is completely inserted, the taper portion of the collar 30 is simply provided. 32 is the same as in the case of the collar 20, but since the small cylindrical portion 33 is further provided, it is formed so as to be deformed along the small cylindrical portion 33, and the tapered portion 32 and the small cylinder of the collar 30 are formed. A binding force for pressing the portion 33 is applied. In this state, if a load is applied that causes the collar 30 to fall downward, the collar main body 31 and the tapered portion 32 move downward and try to come out of the insertion hole 10. The surrounding deforming portion 3d is deformed by receiving stress in the shear direction. This means that the collar main body 31 and the tapered portion 32 receive an upward resistance force in the drawing from the deformable portion 3d, and the collar 30 has a binding force received from the wall portion of the insertion hole 10 and the tapered portion 11. Thus, the shearing force is received from the deformed portion 3d in the upper part of the drawing, and the insertion hole 10 is prevented from being pulled out.

  Here, since the amount of deformation of the deforming portion 3d is not provided with a taper portion below the insertion hole 10, the space between the wall portion of the insertion hole 10 and the collar 30 is required for retaining the collar 30. It is enough to set it to fill at the level of. Further, since the space between the insertion hole 10 and the collar 30 in the deformable portion 3d is narrower than that in the upper deformable portion 3c, the shear resistance that the collar 30 receives from the deformable portion 3d is the upper deformable portion. It becomes a large value compared with what is received from 3c. Of course, when the deformation amount of the deformation portion 3d of the collar 30 is set to the same amount as the deformation amount of the deformation portion 3b of the collar 20, the space between the insertion hole 10 and the collar 30 becomes the small cylindrical portion 33. Since it is narrower than that of the collar 20 provided, the binding force that the tapered portion 32 and the small cylindrical portion 33 of the collar 30 are pressed increases, and the shear resistance that the collar 30 receives from the deforming portion 3d increases. , The insertion hole 10 is more securely retained.

  Next, the retaining characteristics of the fastening part structure of the resin component in the present embodiment will be described in detail with reference mainly to FIG. Here, in addition to the collars 20 and 30 described above, a collar 40 shown in FIG. 9 is also used as a comparative example.

  FIG. 9 is a partial cross-sectional view of a collar 40 of a comparative example in the present embodiment, and FIG. 10 is a characteristic diagram of the retaining load of the fastening portion structure in the present embodiment.

  As shown in FIG. 9, the collar 40 of the comparative example is a cylindrical member made of metal such as iron, and has a collar main body portion 41 that is a cylindrical portion at the center portion, but has tapered portions at both ends thereof. Is not provided, but merely a chamfered portion C is provided. An insertion hole 42 that penetrates the collar 40 is provided inside the collar 40.

  When measuring the retaining characteristics of the fastening part structure of the resin part in the present embodiment, the vehicle intake air having the cylinder head mounting end 3 shown in FIG. 1 and including the insertion hole 10 shown in FIG. Manifold 1 was prepared. Further, as a collar to be inserted into the intake manifold 1, a collar 20 shown in FIG. 3, a collar 30 shown in FIG. 4, and a collar 40 shown in FIG. 9 as a comparative example were prepared. The intake manifold 1 was made of polyamide, and the collars 20, 30, and 40 were made by processing iron pipe materials into respective shapes.

  Next, the collars 20, 30, 40 of such a configuration are arranged along the wall portion of the insertion hole 10 from the end portion having the tapered portion 11 of the insertion hole 10 of the cylinder head mounting end portion 3 as shown in FIG. Then, the whole was accommodated in the insertion hole 10. At the time of such hot press-fitting, the collars 20, 30, 40 are heated to a predetermined temperature and the high temperature state is kept equal, and the press-fitting allowance to the insertion hole 10 is set to be equal. It is set to a predetermined value that makes the press-fitting effective. Further, the collars 20 and 30 have the tapered portion 11 of the insertion hole 10 and the tapered portions 21 and 31 of the collars 20 and 30 set within the predetermined tolerance range described above. Further, when the insertion is completed, both end portions of the collars 20, 30, and 40 and both end portions of the cylinder head mounting end portion 3 corresponding to them are in the surface positions.

  Next, the intake manifold 1 in a state where the collars 20 and 30 have been inserted as described above is put in a thermostat, and it is equal time until the deformed portion 3a by creep shown in FIG. 6 and the like is formed. A predetermined time has elapsed. The collar 40 is not provided with the taper portions 22 and 32 and the small cylindrical portion 33, and the collar main body portion 41 is in close contact with the wall portion of the insertion hole 10, so that the deformed portion due to creep is effective. The collars 20 and 30 are put in the thermostat for a time equal to the time when the collars 20 and 30 are put in the thermostat.

  And in a state where the cylinder head mounting end portion 3 of the intake manifold 1 is gripped and fixed to the collars 20 and 30 formed with the deformed portion 3a or the like by creep after a predetermined time has passed in the thermostat as described above, A load was applied so as to escape upward in the figure in FIG. Here, the reason why the load was applied so as to be pulled out upward in the figure in FIG. 6 and the like is that the upper part where the tapered part 11 is formed in the insertion hole 10 of the cylinder head mounting end 3 is inserted in comparison with the lower part. Since the space between the hole 10 and the collars 20 and 30 is large, the proportion of the deformed portion 3a and the like in the space is low, that is, the shear resistance force that is effective for preventing the deformed portion 3a and the like is small, and the load is lower. This is because the collars 20 and 30 are thought to fall out of the insertion hole 10. Further, the collar 40 is not effectively deformed by creep, but the cylinder 40 of the intake manifold 1 is attached by using a thing in which the time equal to that of the collars 20 and 30 is passed in the thermostat. A load was applied in the same manner with the end 3 held and fixed.

  In this state, the cylinder head mounting end 3 of the intake manifold 1 is held and fixed to the collars 20, 30, and 40 that have passed for a predetermined time in the thermostatic bath, and the upper part of FIG. When a load is applied to the collar 20, the load F in which the collars 20, 30, and 40 have fallen out of the insertion hole 10 is measured, and the result is shown in FIG. Here, in order to see the effect of the deformed portion 3a and the like caused by creep, the collars 20 and 30 are deformed from the boundary line 12 where the tapered portion 11 of the insertion hole 10 starts to the upper end portion of the insertion hole 10. A plurality of test pieces were set so that the deformed portion lengths M1 and M2 in which the same existed were changed within a predetermined range. Specifically, the overall length L1 (7.9 mm) of the collars 20 and 30 and the length L2 (1.9 mm) of the tapered portions 22 and 32 shown in FIGS. A plurality of test pieces are produced by changing the taper angle A of 22 and 32 and the length L3 of the small cylindrical portion 33 of the collar 30, and the load F at which the collars 20 and 30 come out of the insertion hole 10 and fall off is measured. did. For the collar 40, the total length L1 was set equal to that of the collars 20 and 30, and the chamfering angle C was changed while the chamfering length of the chamfered portion C was kept constant at 1 mm. The other dimensions of the collars 20, 30, and 40 were constant values of an outer diameter of 10 mm and diameters of the insertion holes 24, 36, and 42 of 7 mm.

  As shown in the characteristic line a of FIG. 10, the load F that the collar 20 has fallen out of the insertion hole 10 is about 230 to 250 N within a range where the deformed portion length M1 is about 0.45 to 1.0 mm. . Further, as shown by the characteristic line b in FIG. 10, the load F in which the collar 30 falls out of the insertion hole 10 is about 300 to 450 N within a range where the deformed portion length M2 is about 0.45 to 1.3 mm. became. Such a value is practically sufficient as a load bearing load. Further, when creep is generated around the insertion hole 10, the insertion hole 10 itself is also elongated, and the pressure-bonding property between the wall portion and the collar main body portions 21 and 31 is lowered and the binding force is reduced. This can compensate for the decrease in binding power. Note that the collar 30 has a small cylindrical portion 33 that is not provided in the collar 20 because the collar 30 has a larger falling load F than the collar 20 and a larger inclination. Accordingly, the space between the taper portion 11 of the insertion hole 10 and the collar 30 is narrow, correspondingly, the shear resistance force applied to the collar 30 by the deformable portion 3c is large, and the inclination increases as the deformed portion length M2 increases. This is considered to be because In addition, when the characteristic lines a and b are extrapolated to a state where the deformed portion length is zero, that is, the deformation is not caused by creep, the load F at which the collars 20 and 30 come out of the insertion hole 10 and fall off becomes about 225N. However, this value indicates that the collars 20 and 30 in the initial state in which the insertion hole 10 is not deformed and the wall portion of the insertion hole 10 is crimped to the collar main body parts 21 and 31 are detached from the insertion hole 10 and dropped off. It corresponded to the load to do. Further, the characteristic a and the characteristic b are averaged, and the extrapolated characteristic is shown in a line c in FIG. 10 for reference.

  On the other hand, as shown by characteristic d in FIG. 10, the load F in which the collar 40 has fallen out of the insertion hole 10 is deformed at a portion where the wall portion of the insertion hole 10 is slightly deformed by the chamfered portion C of the collar 40. Even when viewed as the part length, the deformed part length was about 50 to 70 N within a very small range of about 0.1 to 0.3 mm, which was not a practically sufficient value. This is because, when the load F is applied in a state where substantially no deformed portion is generated, the collar 40 is coupled to the insertion hole 10 at an early stage in the insertion hole 10 due to a decrease in the binding force accompanying the increase in the length of the hole. It is thought that slipping occurred and the resistance to removal was reduced.

  As can be understood from the characteristics a to d in FIG. 10, the collar 20 having the tapered portion 22 in addition to the collar main body portion 21 is formed from the deformation portion 3 a in addition to the binding force received from the wall portion of the insertion hole 10 and the tapered portion 11. The collar 30 having a taper portion 32 and a small cylindrical portion 33 in addition to the collar main body portion 31 can be effectively prevented from being removed from the insertion hole 10 by receiving a downward shear resistance in the figure. In addition to the binding force received from the wall portion of the hole 10 and the taper portion 11, the deformation portion 3 c receives a shear resistance force in the lower part of the figure, and can be prevented from being pulled out from the insertion hole 10.

  In the present invention, the type, arrangement, number, and the like of the members are not limited to the above-described embodiments, and the constituent elements thereof are appropriately replaced with those having the same operational effects, and the gist of the invention is not deviated. Of course, it can be appropriately changed within the range.

  As described above, according to the fastening part structure of the resin part of the present embodiment, it is possible to reliably prevent the collar press-fitted into the insertion hole of the resin part while suppressing the manufacturing cost by a simple manufacturing process. It is expected that it can be widely applied to the fastening part structure of resin parts because of its general-purpose universal character.

It is a side view of the intake manifold for vehicles which is a resin part in the embodiment of the present invention. It is an expanded sectional view by the XX line of FIG. It is a fragmentary sectional view of the collar inserted in the insertion hole of the intake manifold in this embodiment. It is a fragmentary sectional view of the color of the modification in this embodiment. FIG. 4 is a cross-sectional view showing a state where the collar shown in FIG. 3 is inserted into an insertion hole of an intake manifold. FIG. 6 is a cross-sectional view illustrating a state in which a deformed portion is formed due to creep around the insertion hole of the intake manifold from the state illustrated in FIG. 5. FIG. 5 is a cross-sectional view showing a state where the collar shown in FIG. 4 is inserted into an insertion hole of an intake manifold. FIG. 8 is a cross-sectional view illustrating a state in which a deformed portion is formed due to creep around the insertion hole of the intake manifold from the state illustrated in FIG. 7. It is a fragmentary sectional view of the comparative example color in this embodiment. It is a characteristic view of the retaining load of the fastening part structure in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Vehicle intake manifold 2 ......... Throttle body attachment end 3 ......... Cylinder head attachment end 3a ... Deformation part 3b ... Deformation part 3c ... Deformation part 3d ... Deformation part 4 ......... First joining member 5... 2nd joining member 6... 3rd joining member 10 .. Insertion hole 11... Tapered portion 12 .. Boundary line 20 .. Collar 21. 23 …… Boundary line 24 …… Insertion hole 30 …… Collar 31 …… Collar body part 32 …… Taper part 33 …… Small cylindrical part 34 …… Boundary line 35 …… Boundary line 36 …… Insertion hole 40 …… Color 41 …… Color body 42 …… Insertion hole C ……… Chamfer

Claims (4)

In a fastening part structure of a resin part comprising: a resin part body capable of generating creep; an insertion hole provided in the resin part body; and a collar that is hot-pressed into the insertion hole and through which a fastening member passes. ,
The wall portion of the insertion hole may generate a deformation portion that deforms so as to protrude in the radial direction of the insertion hole due to the creep of the resin component main body, and the collar is formed on the large diameter portion and the large diameter portion. A small-diameter portion that extends continuously outward in the axial direction toward the opening end side of the insertion hole, and only the large-diameter portion is attached by being crimped to the wall portion of the insertion hole by hot pressing. On the other hand, the small diameter portion allows the deformation portion to be generated by the creep of the resin component main body without being hot-pressed into the wall portion of the insertion hole, and the collar is formed by the deformation portion. A resin part fastening part structure characterized in that it is prevented from coming off from an insertion hole. 2. The fastening structure of a resin part according to claim 1, wherein the small-diameter portion is a tapered portion that is continuous from the large-diameter portion and has a diameter that gradually decreases outward in the axial direction . The small diameter portion, the fastening portion structure of the resin component according to claim 2, characterized by further continuously from the tapered portion having a small cylindrical portion extending in the axial direction outwardly. 4. The resin component according to claim 2, wherein one end portion of the insertion hole has a taper portion whose diameter gradually increases starting from a boundary line where the large diameter portion continues to the taper portion or its vicinity. Fastening part structure.

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