JP2007155014A - Component fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a component fixing structure for preventing the rattling of a resin component resin molded, if having a dimensional tolerance, when an engaging protrusion engages with an engaging portion. <P>SOLUTION: A pair of elastically deformable protruded convex portions 2c, 2d are integrally formed in an engaging hole 2 of an engaging pawl 3. An engaging face 5a of the engaging protrusion 5 is formed in an inclined shape with its central portion protruded and inclined toward both sides. When the engaging protrusion 5 engages with the engaging hole 2, the convex portions 2c, 2d are pressed against the inclined engaging face 5a of the engaging protrusion 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a component fixing structure that engages and fixes an engagement surface of an engagement protrusion formed on the other resin component to an engagement portion provided on a plate-like engagement claw formed on one resin component. .

As a component fixing structure for easily fixing two resin components, an engagement protrusion formed on the other resin component in an engagement hole provided on a plate-shaped engagement claw formed on one resin component has been conventionally used. There is known a fixing structure for engaging and fixing (see, for example, Patent Document 1).
JP 2005-291265 A

  By the way, in the fixing structure (part fastening structure) as in Patent Document 1, a clearance is generated when the engaging protrusion is engaged with the engaging hole due to the dimensional tolerance of the resin part to be resin-molded. May cause rattling.

  That is, for example, as shown in FIGS. 9 to 11, the engaging claw 100 having the engaging hole 100 a is inclined with the one resin component 101 integrally formed on the upper surface 101 a and the vertical wall-like engaging surface 102 a. When the engaging protrusion 102 having the back surface 102b is fixed to the other resin part 103 integrally formed on the upper surface 103a, the resin is formed when the engaging surface 102a of the engaging protrusion 102 is engaged with the engaging hole 100a. A slight gap a is generated between the engagement hole 100a and the engagement surface 102a of the engagement protrusion 102 due to a dimensional tolerance at the time of molding, thereby causing rattling.

  Accordingly, the present invention provides a component fixing structure capable of preventing the occurrence of rattling when the engaging protrusion is engaged with the engaging portion even when the resin component to be molded has a dimensional tolerance. Objective.

  In order to achieve the above object, the present invention provides one resin part integrally formed with an engaging claw having an opened engaging portion and the other formed integrally with an engaging protrusion engaged with the engaging portion. A part fixing structure for fixing the one resin part and the other resin part by engaging an engaging surface of the engaging protrusion with the engaging part, A pair of elastically deformable protruding projections are formed integrally with the engaging portion, and the engaging surface of the engaging protrusion is formed in a slope shape so that the central portion protrudes and inclines toward both sides. Then, when the engaging protrusion is engaged with the engaging portion, the convex portions are brought into pressure contact with the inclined engaging surface of the engaging protrusion.

  According to the present invention, when the engaging protrusion is engaged with the engaging portion, the pair of elastically deformable protruding protrusions integrally formed with the engaging portion is the inclined engaging surface of the engaging protrusion. Even if there is a dimensional tolerance in the resin part that is molded with the resin, the dimensional tolerance of the resin part can be absorbed by the elastic deformation of the protruding convex part that is in pressure contact with the inclined engaging surface. Generation of rattling can be prevented.

Hereinafter, the present invention will be described based on the illustrated embodiments.
<Embodiment 1>
FIG. 1 is a schematic perspective view showing a main part of a resin component fixed by a component fixing structure according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a plate-like engagement claw 3 having an engagement hole 2 as an engagement portion is integrally formed on the upper surface 1 a of one resin component 1. On the upper surface 4a, an engagement protrusion 5 that is engaged with the engagement hole 2 is formed integrally. In addition, on the outer surface of the resin component 1, engagement claws 3 having the engagement holes 2 are formed at a plurality of locations. On the outer surface of the resin component 4, the engagement claws 3 (engagement holes 2) are formed. A plurality of engaging protrusions 5 are formed in accordance with the position. The resin component 1 and the resin component 4 described above are, for example, housings of various devices assembled to an instrument panel of a vehicle.

  The tip lower surface 3a on the tip side of the engaging claw 3 having elasticity is inclined toward the rear side. Slit-like grooves 2a and 2b are formed on both sides of the engagement hole 2 on the distal end side toward the distal end side of the engagement claw 3, and the engagement claws 3 are formed on the inner sides of the respective groove portions 2a and 2b. Convex portions 2c and 2d projecting toward the base end side are integrally formed. The convex portions 2 c and 2 d are elastically deformable in the left-right direction of the resin component 1.

  As shown in FIGS. 1 and 2, the vertical wall-like engagement surface 5 a of the engagement protrusion 5 has a central portion protruding forward and its both sides formed in a slope shape. The upper surface 5b of the engagement protrusion 5 is formed in a pentagonal shape with both side surfaces short, and the back surface 5c of the engagement protrusion 5 is inclined toward the rear side (the side opposite to the upper surface 5b). Further, inclined surfaces 5d and 5e are formed between the engaging surface 5a and the upper surface 5b of the engaging protrusion 5 so as to be lowered toward the engaging surface 5a.

  Next, the component fixing structure according to the above-described embodiment will be described.

  As shown in FIG. 1, the engaging claws 3 and the engaging protrusions 5 are aligned, and one resin component 1 is directed from the back surface 5 c side of the engaging protrusion 5 toward the other resin component 4 in the direction of arrow A. By moving, the inclined lower surface 3a of the engaging claw 3 moves while sliding on the inclined rear surface 5c of the engaging protrusion 5.

  When the resin component 1 is further moved in the direction of arrow A, as shown in FIG. 3, the lower end surface 3a of the engagement claw 3 gets over the rear surface 5c of the engagement protrusion 5, and the upper surface 5b and the inclined surfaces 5d, 5e The engagement hole 2 provided in the engagement claw 3 is engaged with the engagement protrusion 5.

  That is, as shown in FIGS. 3 and 4, the both ends of the inclined surface of the engagement surface 5 a of the engagement protrusion 5 are in pressure contact with the convex portions 2 c and 2 d of the engagement hole 2, so that the engagement hole 2 is engaged. One resin component 1 and the other resin component 4 are fixed by engaging with the protrusion 5. At this time, both end sides of the inclined surface of the engagement surface 5a of the engagement protrusion 5 are in pressure contact with the inner ends of the protrusions 2c and 2d of the engagement hole 2, so that the protrusions 2c and 2d are in the outward direction (arrows). B1 and B2 direction).

  As a result, even if there is a dimensional tolerance between the resin-molded engagement hole 2 (engagement claw 3) and the engagement protrusion 5, the engagement hole 2 provided in the engagement claw 3 is engaged with the engagement protrusion 5. In this case, since the dimensional tolerance between the engagement hole 2 (engagement claw 3) and the engagement protrusion 5 can be absorbed by the elastic deformation of the projections 2c and 2d, the occurrence of backlash can be prevented.

  Moreover, since the inclined surfaces 5d and 5e which go down to the front surface 5a side are formed between the front surface 5a and the upper surface 5b of the engagement protrusion 5, the engagement holes 2 (convex portions 2c and 2d) provided in the engagement claw 3 are formed. ) Can be smoothly pushed into and engaged with the front end surface 5a of the engaging protrusion 5.

When the engagement state between the engagement hole 2 and the engagement protrusion 5 is released, the engagement claw 3 is elastically deformed upward by lifting the lower end surface 3a of the engagement claw 3 upward. The engagement state between the joint hole 2 and the engagement protrusion 5 can be released.
<Embodiment 2>
In the second embodiment of the present invention, as shown in FIG. 5, one resin component 1 is integrally formed with a plate-like engagement claw 7 having an engagement portion 6 opened in a concave shape on the distal end side. . In addition, the shape of the engagement protrusion 5 integrally formed on the upper surface of the other resin component 4 is the same as that of the first embodiment.

  On both sides of the front end portion of the engaging portion 6, elastically deformable convex portions 6 a and 6 b that protrude so as to face inward are formed. In addition, the front end lower surface 7a on the front end side of the engaging claw 7 is inclined toward the rear side.

  Next, the component fixing structure according to the present embodiment will be described.

  As shown in FIG. 5, the positions of the engaging claws 7 and the engaging protrusions 5 are aligned, and one resin part 1 is directed from the back surface 5 c side of the engaging protrusion 5 toward the other resin part 4 in the direction of arrow A. By moving, the inclined lower surface 7a of the engaging claw 7 moves while sliding on the inclined rear surface 5c of the engaging protrusion 5.

  When the resin component 1 is further moved in the direction of arrow A, as shown in FIG. 6, the tip lower surface 7a of the engagement claw 7 gets over the rear surface 5c of the engagement projection 5, and the upper surface 5b and the inclined surfaces 5d, 5e. The engaging portion 6 provided on the engaging claw 7 engages with the engaging protrusion 5 by moving while sliding on the engaging claw 7.

  That is, as shown in FIG. 6, the both ends of the inclined surface of the engaging surface 5 a of the engaging protrusion 5 are in pressure contact with the convex portions 6 a and 6 b of the engaging portion 6, so that the engaging portion 6 contacts the engaging protrusion 5. By engaging, one resin part 1 and the other resin part 4 are fixed. At this time, both end sides of the inclined surface of the engagement surface 5a of the engagement protrusion 5 are in pressure contact with the inner ends of the protrusions 6a and 6b of the engagement portion 6, so that the protrusions 6a and 6b are in the forward direction (arrows). Elastically deforms in the C direction).

Thereby, even if there is a dimensional tolerance between the engaging portion 6 (engaging claw 7) and the engaging projection 5 which are resin-molded, the engaging portion 6 provided on the engaging claw 7 is engaged with the engaging projection 5. In this case, since the dimensional tolerance between the engaging portion 6 (engaging claw 7) and the engaging protrusion 5 can be absorbed by the elastic deformation of the convex portions 6a and 6b, the occurrence of rattling can be prevented.
<Embodiment 3>
FIG. 7 is a schematic perspective view showing a main part of a resin component fixed by the component fixing structure according to Embodiment 3 of the present invention.

  As shown in FIG. 7, a plate-like engagement claw 11 having an engagement hole 10 and elastically deformable protrusions 12 a and 12 b on both sides of the engagement claw 11 are formed on the upper surface 1 a of one resin component 1. The upper surface 4a of the other resin component 4 is integrally formed with an engagement protrusion 13 engaged with the engagement hole 10 and protrusions 14a and 14b with which the protrusion pieces 12a and 12b are pressed. Is formed. In addition, the engaging claw 11 and the projecting pieces 12a and 12b protrude from the upper surface 1a of the resin component 1 through a step portion 11a formed integrally corresponding to their thicknesses.

  Note that the outer surface of the resin component 1 is formed with an engaging claw 11 having an engagement hole 10 and projection pieces 12a and 12b at a plurality of locations. A plurality of engagement protrusions 13 are formed in accordance with the position of the claw 11 (engagement hole 10), and a plurality of protrusions 14a, 14b are formed in accordance with the positions of the protrusion pieces 12a, 12b.

  The tip lower surface 11b on the tip side of the engaging claw 11 having elasticity is inclined toward the rear side. The outer sides of the protruding pieces 12a and 12b are slightly curved toward the inner side, and when one resin component 1 is moved to the other resin component 4 side, the outer sides of the protruding pieces 12a and 12b are the protruding portions 14a and 14b. Press in so that it is inside. The engaging surface 13a of the engaging protrusion 13 is formed in a vertical wall shape, and the back surface 13b of the engaging protrusion 13 is inclined rearward.

  Next, the component fixing structure according to the above-described embodiment will be described.

  As shown in FIG. 7, the positions of the engaging claws 11 and the engaging protrusions 13 are aligned, and one resin part 1 is directed from the back surface 13 b side of the engaging protrusion 13 toward the other resin part 4 in the direction of arrow A. By moving, the inclined lower end surface 11ba of the engaging claw 11 moves while sliding on the inclined rear surface 13b of the engaging protrusion 13.

  When the resin component 1 is further moved in the direction of arrow A, as shown in FIG. 8, the resin component 1 moves while sliding on the upper surface 13 c of the engagement protrusion 13, and the engagement hole 10 provided in the engagement claw 11. Engages with the engaging surface 13a of the engaging protrusion 13, and the one resin component 1 and the other resin component 4 are fixed. At this time, the outer sides of the projecting pieces 12a and 12b are in pressure contact with the corners of the projecting parts 14a and 14b, whereby the projecting pieces 12a and 12b are elastically deformed in the inner directions (arrow C1 and C2 directions), respectively.

Thereby, even if there is a dimensional tolerance between the engagement hole 10 (engagement claw 11) and the engagement projection 13 formed by resin molding, the engagement hole 10 provided in the engagement claw 11 is the engagement surface of the engagement projection 13. When engaged with 13a, the dimensional tolerance between the engagement hole 10 (engagement claw 11) and the engagement protrusion 13 is absorbed by the elastic deformation of the protrusions 12a and 12b pressed against the corners of the protrusions 14a and 14b. Therefore, the occurrence of rattling can be prevented.
.

The schematic perspective view which shows the principal part of the resin component fixed by the component fixing structure which concerns on Embodiment 1 of this invention. The top view which shows the engagement protrusion provided in the upper surface of the other resin component in Embodiment 1 of this invention. The top view which shows the component fixing structure which concerns on Embodiment 1 of this invention. FIG. 4 is a cross-sectional view taken along the line II in FIG. 3. The schematic perspective view which shows the principal part of the resin component fixed by the component fixing structure which concerns on Embodiment 2 of this invention. The top view which shows the component fixing structure which concerns on Embodiment 2 of this invention. The schematic perspective view which shows the principal part of the resin component fixed by the component fixing structure which concerns on Embodiment 3 of this invention. The top view which shows the component fixing structure which concerns on Embodiment 3 of this invention. The schematic perspective view which shows the principal part of the resin component fixed by the component fixing structure in a prior art example. The top view which shows the component fixing structure in a prior art example. II-II sectional view taken on the line of FIG.

Explanation of symbols

1 One resin part 2, 10 Engagement hole (engagement part)
2c, 2d, 6a, 6b Protrusions 3, 7, 11 Engagement claws 4 Other resin parts 5, 13 Engagement protrusions 5a Engagement surfaces 6 Engagement parts 12a, 12b Protrusion pieces 14a, 14b Protrusions

Claims (1)

One engaging resin claw having an engaging part that is open, and the other resin part integrally forming an engaging projection that engages with the engaging part, A part fixing structure for engaging the engaging surface of the engaging protrusion with the part and fixing the one resin part and the other resin part;
A pair of elastically deformable protrusions are formed integrally with the engaging portion, and the engaging surface of the engaging protrusion is formed in a slope shape so that the central portion protrudes and inclines toward both sides. Forming and engaging each of the convex portions with the slope-like engaging surface of the engaging protrusion when the engaging protrusion is engaged with the engaging portion,
A component fixing structure characterized by that.

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