JP5839501B2 - Bonding structure of synthetic resin parts - Google Patents

Description

  The present invention relates to a coupling structure of synthetic resin parts, for example, interior parts for a vehicle made of synthetic resin such as a door trim and a roof trim.

  In Patent Document 1, a notch groove formed in a side edge portion of one synthetic resin component is engaged with a boss portion provided on the other synthetic resin component, and an end portion of the boss portion is processed by, for example, ultrasonic welding. Thus, a technique is disclosed in which parts are bonded to each other in a polymerized state by heat caulking.

Japanese Patent Laid-Open No. 4-93226

  In the disclosed technique of Patent Document 1, since the molten resin material flows into the notch groove at the time of welding of the end portion of the boss portion, normal heat staking for passing the boss portion through the circular hole and welding the end portion is performed. In comparison, the amount of molten resin in the caulking head is small, and it cannot be denied that the bond strength is lowered.

  In order to compensate for this decrease in the volume of the caulking head, it is conceivable to increase the protruding height of the boss part and increase the amount of molten resin at the end part, but this is disadvantageous in terms of cost. In addition, the welding time becomes longer.

  Also, even if the amount of molten resin at the end of the boss is increased in this way, the molten resin material that has flowed into the notch groove has little contribution to caulking and is not expected to improve the bond strength. Can not.

  In view of the above, the present invention provides a synthetic resin component coupling structure that can compensate for the lack of a seating surface with respect to the fastening means around the notch groove of the synthetic resin component and increase the coupling strength.

  In the synthetic resin component joining structure according to the present invention, the notch groove formed in the side edge portion of the synthetic resin component is engaged with the boss portion protruding from the counterpart component side to superimpose these components, and the boss portion is A structure in which these parts are connected to each other by fastening means is basically used.

  The mating part is provided with a protrusion that fits into the notch groove of the synthetic resin part and has a tip that is substantially flush with the outer surface of the synthetic resin part. The main structure is that it is configured as a part of the seating surface with respect to the wearing means.

  According to the present invention, the protrusion on the counterpart part is fitted into the notch groove of the synthetic resin part, so that the tip of the protrusion constitutes a part of the seating surface with respect to the fastening means, and around the notch groove. Make up for the lack of a seating surface for the fastening means.

  Thereby, the fastening means can be firmly received around the notch groove, and the bonding strength of the synthetic resin component to the mating component can be increased.

The perspective view which shows 1st Embodiment of this invention. Cross-sectional explanatory drawing which follows the AA line of FIG. The perspective view which shows the state which caulked the edge part of the boss | hub part. Sectional drawing which follows the BB line of FIG. The perspective view which shows 2nd Embodiment of this invention. The perspective view which shows 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The first embodiment shown in FIGS. 1 to 4 exemplifies a joint portion of three trim members 1, 2, 3 in a door trim of an automobile.

  As the vehicle door trim, a trim upper end portion corresponding to the door waist portion is formed by partially combining three trim members 1, 2, and 3 according to specifications.

  The trim materials 1 to 3 are all molded with an appropriate synthetic resin material.

  The trim material 1 constitutes a center trim serving as a base of the door trim, and the trim material 2 constitutes an upper trim that is clip-connected to the center trim. As will be described later, the trim material 3 is coupled to the center trim and the upper trim in a tightened state to constitute an upper garnish that decorates the upper end portion of the trim.

  Therefore, in this embodiment, the center trim 1 and the upper trim 2 correspond to the counterpart parts, and the upper garnish 3 corresponds to the synthetic resin parts.

  The center trim 1 is integrally provided with cylindrical boss portions 4 at a plurality of locations that overlap the upper trim 2 and are arranged on the back side.

  A rib 5 that functions as a spacer that keeps the space between the reinforcement of the boss part 4 and the upper trim 2 constant is integrally formed in the standing base part of the boss part 4 in, for example, a cross shape around the boss part 4. Molded.

  A boss insertion hole 6 having a diameter slightly larger than the outer diameter of the boss part is formed in the upper trim 2 at a position corresponding to the boss part 4 described above.

  The center trim 1 and the upper trim 2 are a means for fixing a hidden clip or the like outside the figure at a portion where the boss portion 4 and the boss insertion hole 6 are inserted and engaged with each other and overlapped with each other. It is connected and fixed by.

  On the other hand, a notch groove 7 to be inserted into and engaged with the boss portion 4 is formed in the lower edge portion of the upper garnish 3 connected to the upper trim 2 so as to correspond to the boss portion 4.

  The notch groove 7 is formed in a substantially U-shaped groove edge shape that opens to the lower edge of the upper garnish 3 in relation to die cutting in the molding of the upper garnish 3.

  The upper garnish 3 is inserted into and engaged with the boss portion 4 projecting from the boss insertion hole 6 of the upper trim 2 to superpose the notch groove 7 on the upper trim 2, and fastening means described later via the boss portion 4. 10 combined.

Here, the upper trim 2 is integrally formed with a protrusion 8 that fits into the notch groove 7 of the upper garnish 3.

  The protrusion 8 protrudes in the vicinity of the boss insertion hole 6, and the tip end surface thereof is set to a height that is substantially flush with the outer surface of the upper garnish 3. The tip is configured as a part of the seating surface for the fastening means 10.

  In the present embodiment, as the above-described fastening means 10, for example, heat caulking for ultrasonic welding of the end portion of the boss portion 4 is adopted, and the peripheral edge portion of the notch groove 7 through which the boss portion 4 is inserted and the tip end of the protruding portion 8. The surface is melted together with the end portion of the boss portion 4, and the caulking head portion 11 is integrally welded.

  Therefore, the boss 4 described above is set to a dimension that protrudes outward from the notch groove 7 at a required height so that a caulking head 11 having a required volume can be obtained.

  According to the structure of the first embodiment, the protrusion 8 formed on the upper trim 2 is fitted into the notch groove 7 of the upper garnish 3, so that the tip of the protrusion 8 is a seating surface with respect to the fastening means 10. Since it constitutes a part, it is possible to compensate for the lack of the seating surface with respect to the fastening means 10 around the notch groove 7.

  Thereby, the fastening means 10 can be firmly received around the notch groove 7 and the bonding strength of the upper garnish 3 to the upper trim 2 can be increased.

  In particular, in the present embodiment, as the above-described fastening means 10, general-purpose heat caulking that is advantageous in terms of processing and work is used to join the synthetic resin parts together. The flow of the molten resin material into the groove 7 can be suppressed, and the volume reduction of the caulking head 11 can be prevented.

  FIG. 5 shows a second embodiment of the present invention. In this embodiment, the upper garnish 3 is directly coupled to the center trim 1.

  Therefore, the protrusion 8 constituting a part of the seating surface is in the above-described positional relationship with the center trim 1, that is, at a position corresponding to the notch groove 7 of the upper garnish 3 and close to or integrally with the boss 4. Projected to

  Therefore, even in the structure of the second embodiment, the same effects as those of the first embodiment can be obtained when the above-described heat caulking is adopted as the fastening means 10.

  FIG. 6 shows a third embodiment of the present invention. In this embodiment, a screw member 12 that is screwed to the end portion of the boss portion 4 is used as the fastening means 10, which is advantageous in terms of cost.

  For this reason, the boss portion 4 is formed with a protruding height whose tip is substantially flush with the outer surface of the upper garnish 3.

  Even in the case of the third embodiment, the tip of the protrusion 8 fitted in the notch groove 7 of the upper garnish 3 constitutes a part of the seat surface with respect to the screw member 12, and the lack of the seat surface around the notch groove 7 is prevented. In order to compensate, the head of the screw member 12 can be received firmly and the bonding strength of the upper garnish 3 can be increased.

  In this embodiment, the upper garnish 3 is directly coupled to the center trim 1 as in the second embodiment. However, the center trim 1, the upper trim 2, and the upper garnish 3 shown in the first embodiment are combined. It can also be applied to door trims that are designed to be joined together.

  In each of the above embodiments, the description has been given by taking, as an example, the trim material that constitutes the door trim of the automobile as the synthetic resin part and the counterpart part, but the present invention is not limited to this. In particular, the counterpart part does not necessarily need to be made of a synthetic resin, and can correspond to a part made of metal or wood. Moreover, although the projection part 8 disclosed the thing of a solid structure, it can also be set as the cavity structure which the side surface side of the other components 1 or 2 opened.

1 ... Center trim (parts)
2… Upper trim (parts)
3… Upper garnish (synthetic resin parts)
4 ... Boss part 7 ... Notch groove 8 ... Protrusion part 10 ... Fastening means 11 ... Heat caulking head 12 ... Screw member

Claims (3)

The notch groove formed on the side edge of the synthetic resin part is engaged with the boss part protruding from the counterpart part side to superimpose these parts, and the parts are connected to each other by the fastening means via the boss part. Structure,
On the side of the mating part, there is provided a projecting part that fits into the notch groove of the synthetic resin part, the tip of which is substantially flush with the outer surface of the synthetic resin part, and the tip of the projecting part is attached to the fastening means A synthetic resin component joining structure characterized by being configured as a part of a seating surface.   2. The synthetic resin component joining structure according to claim 1, wherein the boss portion is made of a synthetic resin material, and the fastening means is heat caulking for welding an end portion of the boss portion. The synthetic resin component joining structure according to claim 1, wherein the fastening means is a screw member screwed to an end portion of the boss portion.

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