JP2006234035A - Fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve fitting performance while reducing an insertion load and facilitate the removing work in a fitting structure of two components. <P>SOLUTION: When a second member 22 is inserted into a recessed part 14 of a first member 12, a claw part 40 of the second member is engaged to a fitting hole 18 of the first member, and a pressing part 42 of the second member abuts on a projecting part 24 of the first member, which makes the first member and the second member be fitted to each other. Once being in the fitting status, the second member never unintentionally drop out of the first member though the force acts to the direction for pulling the second member out of the first member because of the claw part 40 engaged with the fitting hole 18. Though a wall composing the recessed part is to be deformed, the engagement status of the fitting hole and the claw part never be unintentionally released as the pressing part 42 of the second member abutting on the projecting part 24 of the first member prevents the deformation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin component fitting structure, and more particularly to a fitting structure having high fitting performance.

As a fitting structure for fitting resin parts to each other without using screws, there is a resin part fixing structure disclosed in Patent Document 1, for example. This is provided with a boss part on one member and a through hole and a fitting part on the other member. When the boss part is inserted into the through hole and fitted with the fitting part, the two parts are It is comprised so that it may mutually be fixed.
Utility model registration No. 3068533

  However, in the above-described conventional example, the locking plate is configured to be fitted to the boss portion by the elasticity of the thin portion, so that a manufacturing error is large, or the thin portion is deteriorated with time, and the elasticity is weak. The resin may creep or deform at a high temperature, which may cause rattling in the fitting state between the fitting portion and the boss portion, which may cause abnormal noise.

  In addition, in the resin component fitting structure, generally, there is a relationship that, if an attempt is made to increase the holding force (fitting force) in the fitted state, the insertion load required to fit the components also increases. On the contrary, when the insertion load is reduced, the fitting force is also reduced.

  There is one that increases the fitting force while reducing the insertion load, dividing the insertion part into two parts and creating a fitting state by combining three parts, but the cost increases due to the increase in the number of parts Was invited.

  Furthermore, due to the recent increase in awareness of environmental issues, efforts to recycle parts are being actively conducted, and the resin parts fitting structure is also required to be easy to remove. It was.

  In view of the above facts, an object of the present invention is to make it difficult to remove the fitting without increasing the insertion load and facilitate the removal operation in the two-part fitting structure.

  The invention of claim 1 is configured to be capable of being inserted into the concave portion of the first member having a concave portion and a fitting hole formed in a wall constituting the concave portion, and to the first member. A claw portion that is configured to be engageable with the fitting hole in the insertion state and configured to be elastically deformable in a direction of being detached from the fitting hole when removed, and the insertion portion into the first member in the insertion state. And a second member having a pressing portion that contacts the first member and prevents deformation of the wall constituting the concave portion.

  In the fitting structure according to claim 1, when the second member is inserted into the recess of the first member, the claw portion of the second member is engaged with the fitting hole of the first member, and the second member The presser part comes into contact with the first member, and the first member and the second member are engaged. The insertion load required for fitting the first member and the second member is not particularly large, and can be inserted with a normal force.

  Once in the fitted state, even if force acts in the direction of pulling out the second member from the first member, the claw portion is locked in the fitting hole, so that it does not unintentionally come out, Even if the wall forming the recess is deformed, the holding portion of the second member that is in contact with the first member prevents this, so that the engagement state between the fitting hole and the claw portion is unintentionally released. Never happen.

  Thus, in the fitting structure according to claim 1, the fitting is difficult to come off, and the fitting state is caused by the engagement between the claw part and the fitting hole, and the separation preventing structure by the holding part and the projection part. Since it is produced, it does not induce creep deformation under high temperature, and the fitting performance does not deteriorate.

  Further, when removing the claw, it is only necessary to elastically deform the claw in a direction in which the claw is removed from the fitting hole. Therefore, the removal operation is easy and the parts can be reused.

  The invention according to claim 2 is the fitting structure according to claim 1, further comprising a protruding portion that is formed to protrude from the outer wall on the back surface side of the wall constituting the recess, and the pressing portion of the second member is In the insertion state to the first member, it is formed at a position where it abuts on the protrusion.

  In the fitting structure according to claim 2, when the second member is inserted into the first member, the protrusion formed on the first member comes into contact with the holding portion of the second member, so that the holding portion is the first holding portion. The frictional force is smaller than that in the case where the outer wall of the member abuts over a wide range, and the insertion load required to insert and fit the second member into the first member can be suppressed.

  According to a third aspect of the present invention, in the fitting structure according to the first or second aspect, when the first member and the second member are fitted and the claw portion is engaged with the fitting hole. In addition, a convex portion is formed on the bottom surface of the concave portion so that the claw portion is pressed and urged against the inner wall of the fitting hole.

  The shape of the top of the convex portion may be a ridge shape, or the top of the convex portion may be a dot or a plane, such as a cone or a truncated cone.

  In the fitting structure according to claim 3, a convex portion is formed on the bottom surface of the concave portion of the first member, and the second member in contact with the convex portion is easily elastically deformed. Since the claw portion is pressed and urged against the inner wall of the fitting hole by elasticity, the insertion load can be made smaller than when there is no convex portion. Moreover, there is no backlash between the first member and the second member in the fitted state, and no abnormal noise is generated.

  As described above, according to the fitting structure of the present invention, in the two-part fitting structure, the fitting can be made difficult to remove without increasing the insertion load, and the removal work can be easily performed. It has the excellent effect of being able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The fitting structure 10 according to the present embodiment includes a first member 12 and a second member 22 in FIGS. 1 to 4.

  A recess 14 is formed in the first member 12, and the recess 14 includes a first inner wall 16 that is an example of a wall constituting the recess 14, a second inner wall 26 that faces the first inner wall 16, and a first inner wall. 16 and the second inner wall 26 are formed of a side wall 50 formed continuously at both ends, and a bottom surface 28 located at the deepest portion.

  As shown in FIG. 1, a flat plate portion 34 having ribs 32 extends on the back side of the bottom surface 28, and a bent portion having ribs 36 continues from the entrance of the recess 14 to the first inner wall 16. The part 38 extends. In addition, the shape of the part which does not participate in the fitting with the 2nd member 22 among the 1st members 12 is arbitrary, and it changes into various shapes as needed.

  The first member 12 has a concave portion 14 and a fitting hole 18 formed in the first inner wall 16 of the concave portion 14, and the respective portions are integrally molded using, for example, a general resin. .

  As shown in FIG. 2, in the recess 14, the second inner wall 26 so that the distance between the first inner wall 16 and the second inner wall 26 facing the first inner wall 16 gradually decreases in the depth direction of the recess 14. Is inclined with respect to the arrow I direction (insertion direction) (the first inner wall 16 is parallel to the arrow I direction). The first inner wall 16 may be inclined with respect to the arrow I direction, and the first inner wall 16 and the second inner wall 26 may be inclined with respect to the arrow I direction.

  The fitting hole 18 is formed, for example, in a substantially center of the first inner wall 16 so as to penetrate in a square shape.

  Further, the first member 12 has a protrusion 24 that is formed to protrude from the outer wall 20 that is the back surface side of the first inner wall 16.

  The protrusion 24 is formed in, for example, a rectangular parallelepiped shape at one place in the center in the width direction of the outer wall 20 on the entrance side of the recess 14 with respect to the fitting hole 18, for example. Note that the shape, position, and number of the protrusions 24 are not limited thereto, and ribs may be provided for reinforcement.

  At the center in the width direction of the bottom surface 28 which is the deepest part of the recess 14, for example, a convex part 30 having a ridge line parallel to the depth direction of the fitting hole 18 is formed as shown in FIG. 3.

  In addition, the shape of the top of the convex portion 30 is not limited to the ridge line shape, and the top of the convex portion is point-like or planar like a cone, a square pyramid, a truncated cone, a square frustum, a spherical surface, or the like. It may be a thing.

  Windows 16 </ b> A and 28 </ b> A are formed on the first inner wall 16 and the bottom surface 28.

  Next, as shown in FIGS. 1 and 2, the second member 22 includes a lower surface 52 having a claw portion 40, side surfaces 54 that are continuous on both sides in the width direction of the lower surface 52, and an upper surface that is continuous with the side surfaces 54 on both sides. 56 and the distal end portion 44 are formed in a convex shape so that they can be inserted into the concave portion 14 of the first member 12.

  The lower surface 52, the side surface 54, and the upper surface 56 are each formed in a shape along the first inner wall 16, the side wall 50, and the second inner wall 26 of the first member 12. The tip portion 44 is formed, for example, in a planar shape and is configured to be elastically deformed moderately.

  A flat plate portion 48 extends on the side of the second member 22, and a stopper portion 46 is formed on the inner side of the second member 22, but does not participate in the fitting with the first member 12. The shape of these portions is arbitrary, and can be changed to various shapes as necessary.

  In addition, the second member 22 is configured to be engageable with the fitting hole 18 in the inserted state into the first member 12, and the claw portion 40 is formed to be elastically deformable in a direction away from the fitting hole 18. A holding portion 42 that contacts the protrusion 24 and prevents the deformation of the first inner wall 16 in the inserted state into the first member 12. For example, the above-described portions are integrally formed using a general resin, for example. is there.

  As shown in FIG. 4, for example, the claw portion 40 is formed in a cantilever shape by forming a slit 58 in the lower surface 52, and the second member 22 is allowed to be inserted into the first member 12. However, the second member 22 is disengaged from the fitted first member 12 so as not to be allowed except when a removal operation is performed and an excessive load is applied. Yes.

  As shown in FIG. 2, the pressing portion 42 sandwiches the protruding portion 24 of the first member 12 between the pressing portion 42 and the claw portion 40 in a state where the second member 22 is inserted into the first member 12. In order to achieve this, it is formed so as to be separated from the lower surface 52 by the sum of the height of the protrusion 24 and the thickness of the first inner wall 16 where the protrusion 24 is located, and projecting in the direction of arrow I.

  In order to prevent the presser part 42 from being caught by the protrusion 24 when the second member 22 is pulled out, the presser part 42 is formed in parallel with the arrow I direction, and the end edge 42A of the presser part 42 has, for example, a circular arc shape in cross section. It is preferable to be formed.

In the above configuration, the protrusion 24 of the first member 12 is sandwiched between the pressing portion 42 and the claw portion 40. However, the present invention is not limited to this. For example, the protrusion 24 is eliminated, The pressing portion 42 may be in direct contact with the outer wall 20 of the first member 12, or a hole may be formed in the protruding portion 24 so that a pin corresponding to the pressing portion 42 enters the hole.
(Function)
The present embodiment is configured as described above, and the operation thereof will be described below. 1 and 2, the position of the claw portion 40 of the second member 22 and the position of the fitting hole 18 of the first member 12 are matched, and the second member 22 is in the direction of arrow I with respect to the first member 12. When the second member 22 is inserted toward the second inner wall 26, the second member 22 is guided by the second inner wall 26 of the recess 14, and the claw portion 40 is pressed against the first inner wall 16.

  The claw portion 40 moves over the first inner wall 16 due to its own elastic deformation, and when it reaches the fitting hole 18, it returns to the natural state in the direction of arrow L and engages with the fitting hole 18.

  When the claw portion 40 gets over the first inner wall 16, as shown in FIG. 5, when the presser portion 42 gets over the protruding portion 24 in the arrow K direction and the claw portion 40 engages with the fitting hole 18, The protrusion 24 is sandwiched between the pressing portion 42 and the pressing portion 42.

  As a result, even if the first inner wall 16 tries to deform in the direction of the arrow M, the presser portion 42 that is in contact with the protruding portion 24 prevents this, so the engagement state between the fitting hole 18 and the claw portion 40 is intended. It will not be released without it, and it is difficult to release the fitting.

  At the moment when the claw portion 40 is engaged with the fitting hole 18, a moderation sound is generated by hitting the first inner wall 16 by the claw portion 40. Z)).

  Further, when the second member 22 is inserted into the first member 12 and fitted, the tip 44 of the second member 22 is first shown in FIG. 4 before the claw portion 40 engages with the fitting hole 18. Comes into contact with the convex portion 30 of the bottom surface 28.

  Since the claw portion 40 does not enter the fitting hole 18 just by abutting, when the second member 22 is further pushed in, the tip end portion 44 is elastically deformed within the gap f with the convex portion 30 as a fulcrum, thereby The claw portion 40 further advances and can enter the fitting hole 18 for the first time.

  At this time, the elastic deformation amount of the tip portion 44 still remains, and the claw portion 40 is pressed and urged against the inner wall 18A of the fitting hole 18 by the elasticity of the tip portion 44 while being engaged with the fitting hole 18. It becomes a state. For this reason, no rattling occurs in the fitted state, and no abnormal noise is generated.

  Since the elastic deformation of the tip portion 44 is caused by using the convex portion 30 as a fulcrum, a large elastic deformation can be caused by a small pushing force, and the second member 22 is guided by the inclined second inner wall 26. Therefore, the first member 12 and the second member 22 can be fitted with a small insertion load.

  When removing the second member 22 from the first member 12, as shown in FIG. 2, the claw portion 40 is elastically deformed in the direction of the arrow R and detached from the fitting hole 18, so that it can be easily removed in the removal direction O. Can be pulled out. At this time, since the stopper portion 46 limits the deformation amount of the claw portion 40, the claw portion 40 is not broken and the possibility of reusing parts is high.

  In FIG. 4, a large gap is formed between the side wall 50 of the recess 14 and the side surface 54 of the second member 22, but this gap is drawn in an exaggerated manner, and it is preferable that the gap is small. .

In a fitting structure, it is a perspective view which decomposes | disassembles and shows the 1st member and the 2nd member. FIG. 2 is a cross-sectional view taken along the line 2-2 in FIG. 1 showing a fitting structure in a fitting state. It is a partially broken perspective view which shows the recessed part of a 1st member. FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 2 showing a fitting structure in a fitting state. When inserting a 2nd member in a 1st member, while a nail | claw part gets over a 1st inner wall, it is sectional drawing which shows that a pressing part gets over a projection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fitting structure 12 1st member 14 Recessed part 16 1st inner wall (wall which comprises a recessed part)
18 fitting hole 22 second member 24 projecting portion 26 second inner wall 28 bottom surface 30 convex portion 40 claw portion 42 presser portion

Claims (3)

A first member having a recess and a fitting hole formed in the wall constituting the recess;
The first member is configured to be insertable into the recess, is configured to be engageable with the fitting hole in the inserted state into the first member, and can be elastically deformed in a direction away from the fitting hole when removed. A second member having a configured claw portion, and a pressing portion that contacts the first member in the inserted state to the first member and prevents deformation of the wall that forms the recess;
A fitting structure characterized by comprising: The first member has a protrusion that is formed to protrude from the outer wall that is the back side of the wall that constitutes the recess,
The presser part of the second member is formed at a position where the presser part comes into contact with the protruding part when fitted with the first member;
The fitting structure according to claim 1.   When the first member and the second member are fitted and the claw is engaged with the fitting hole, the claw is pressed against the inner wall of the fitting hole. The fitting structure according to claim 1, wherein a convex portion is formed on the bottom surface.

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