JP2011220376A - Assembly manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly manufacturing method in which components are assembled to each other while suppressing backlash.SOLUTION: The method for manufacturing an assembly 100 is configured as follows. A locking claw 41 provided on a fastening member 40 is inserted into a locking hole 21 provided in a non-fastening member 20 so as to lock the locking claw to the locking hole 21. Consequently, the fastening member 40 is assembled to the non-fastening member 20, thereby manufacturing the assembly. The inner-peripheral wall surface 24a of the locking hole 21 and the outer-peripheral wall surface 44a of the locking claw 41 are formed of materials having deflection temperatures under load different from each other. The inner-peripheral wall surface 24a formed of a PC resin having a higher deflection temperature under load is provided with a protrusion 25 protruding toward the outer-peripheral wall surface 44a formed of an ABS resin having a lower deflection temperature under load. The locking claw 41 is locked to the locking hole 21 so as to bring the protrusion 25 into contact with the outer-peripheral wall surface 44a. In that state, the temperature of the outer-peripheral wall surface 44a is raised so as to form a complementary recess 45, having a shape for complementing the protrusion 25, on the outer-peripheral wall surface 44a.

Description

  The present invention relates to a method of manufacturing an assembly in which a member having a locking claw is locked to a member having a locking hole.

  Conventionally, in an assembly composed of a plurality of members, a locking hole is provided in one of the plurality of members, and a locking claw provided in the other member is locked in the locking hole. A structure in which these members are assembled together is known (see, for example, Patent Documents 1 and 2). In these structures, the locking claw and the locking hole are elastically deformed, and the locking claw is inserted and locked in the locking hole. Therefore, a gap is secured between the locking claw and the locking hole so that the locking claw can be reliably inserted into the locking hole. For this reason, the assembly is assembled in a state where the members are loosened.

  In order to eliminate the gap between the locking claw and the locking hole, the snap-fit mounting structure disclosed in Patent Document 1 further includes a dimension maintaining member. Specifically, a recess that is recessed along the insertion direction is provided at an end of the locking claw that is on the distal end side in the insertion direction into the locking hole. By pushing the dimension maintaining member into the concave portion, the locking claw is pushed and spread in the direction intersecting the axial direction of the locking hole and pressed against the locking hole. As a result, the gap generated between the locking claw and the locking hole in the direction intersecting the axial direction of the locking hole is eliminated.

  Further, in the assembly relating to the throttle control device disclosed in Patent Document 2, a seal member is sandwiched between a member having a locking claw and a member having a locking hole. The seal member urges the member including the locking claw in the direction of separating from the member including the locking hole by being sandwiched between the members. As a result, the latching claw is pulled in the direction of coming out of the latching hole along the axial direction of the latching hole, so that the gap generated between the latching claw and the latching hole in this axial direction is eliminated. The

JP 2004-332762 A JP 2004-132232 A

  In the configurations disclosed in Patent Document 1 and Patent Document 2, in order to eliminate the gap generated between the locking claw and the locking hole, it is necessary to add configurations such as a dimension maintaining member and a seal member. Absent. Therefore, when these configurations are applied, the number of parts of the assembly increases. In addition, in the configuration disclosed in Patent Document 1, the gap in the axial direction of the locking hole can be eliminated by adding a dimension maintaining member, but the clearance in the axial direction of the locking hole can be eliminated. It will not lead to the resolution of. Therefore, in this axial direction, the locking claw and the locking hole can be displaced relative to each other.

  On the other hand, in the configuration disclosed in Patent Document 2, although the gap in the axial direction of the locking hole can be eliminated by adding the seal member, the gap in the direction intersecting with the axial direction can be eliminated. Absent. Therefore, the locking claw and the locking hole can be displaced relative to each other in the axial crossing direction. As described above, in the assembly assembled using the structures described in Patent Document 1 and Patent Document 2, the looseness between the members has not been reliably eliminated.

  This invention is made in view of the said problem, Comprising: After suppressing the increase in a number of parts, it is providing the manufacturing method of the assembly assembled | attached in the state by which parts were suppressed in looseness. .

  In order to achieve the above object, according to the first aspect of the present invention, a locking claw provided in the second member is inserted into a locking hole provided in the first member, and is locked in the locking hole. A method of manufacturing an assembly by assembling the second member to the first member, wherein the inner peripheral wall surface of the locking hole and the outer peripheral wall surface facing the inner peripheral wall surface of the locking claw are resins having different load deflection temperatures. Low heat resistance formed by a resin material with a low deflection temperature under the inner and outer wall surfaces, formed on a high heat resistant wall surface formed with a material that has a higher deflection temperature under the inner and outer wall surfaces. Providing a protruding part that protrudes toward the wall surface, and by locking the locking claw in the locking hole, the low heat resistant wall surface is heated by raising the temperature of the low heat resistant wall surface while the protruding part is in contact with the low heat resistant wall surface. Shape that complements the protrusion The manufacturing method of the assembly and forming a complementary recess.

  According to the present invention, the inner peripheral wall surface of the locking hole and the outer peripheral wall surface facing the inner peripheral wall surface of the locking claw are formed of resin materials having different load deflection temperatures. Therefore, by raising the temperature of the low heat resistant wall surface having a low load deflection temperature among these wall surfaces, only this low heat resistant wall surface can be brought into a plastically deformable state. In the state in which the locking claw is locked in the locking hole, the protrusions of the high heat resistant wall surface having a high load deflection temperature out of the inner peripheral wall surface and the outer peripheral wall surface protrude toward the low heat resistant wall surface, and the low heat resistant wall surface Touching. Therefore, the supplementary recessed part which complements the shape of a projection part is formed in the low heat-resistant wall surface heated up by being pushed and plastically deformed by a projection part.

  The complementary recess formed as described above has a shape that exactly complements the shape of the protrusion, and is in close contact with the protrusion. Therefore, the inner peripheral wall surface of the locking hole and the outer peripheral wall surface of the locking claw are unlikely to be relatively displaced from each other both in the axial direction of the locking hole and in the direction intersecting the axial direction. Therefore, it is possible to manufacture an assembly in which the second member is assembled to the first member in a state where looseness is suppressed while suppressing an increase in the number of parts.

  In the invention according to claim 2, the low heat resistant wall surface is the outer peripheral wall surface of the locking claw, and the high heat resistant wall surface is the inner peripheral wall surface of the locking hole, and the outer peripheral wall surface is raised by raising the temperature of the outer peripheral wall surface. A complementary concave portion having a shape that is complementary to the portion is formed.

  In general, the inner peripheral wall surface of the locking hole is formed so as to be easily spread with the insertion of the locking claw so that the locking claw can be inserted smoothly. Therefore, when the inner peripheral wall surface of the locking hole is a low heat-resistant wall surface having a low deflection temperature under load, there is a possibility that the entire inner peripheral wall surface is plastically deformed by being pushed from the protrusion.

  Therefore, as in the present invention, by forming the inner peripheral wall surface of the locking hole with a resin material having a high deflection temperature, the plastic deformation of the entire inner peripheral wall surface due to the temperature rise to form the complementary recess is obviated. Can be prevented. Therefore, the complementary recess is reliably formed on the outer peripheral wall surface of the locking claw, which is a low heat resistant wall surface, by pressing with the protrusion. Therefore, in order to reliably form the complementary recess, it is preferable to form the inner peripheral wall surface of the locking hole with a resin material having a high deflection temperature under load.

  In the invention according to claim 3, the peripheral edge of the opening opposite to the side where the locking claw is inserted among the pair of openings of the locking hole protruding from the outer peripheral wall surface and penetrating the first member. The protrusion is formed by forming a locking projection that can contact the portion and a relief groove extending along the axial direction of the locking hole in the locking projection, and inserting a locking claw into the locking hole. Passes through the escape groove.

  In the form in which the protruding portion protrudes from the inner peripheral wall surface of the locking hole, when the locking claw is inserted into the locking hole, the side opposite to the side where the locking claw is inserted among the pair of openings of the locking hole There is a possibility that the locking projection that can contact the peripheral edge of the opening contacts the projection and damages the projection. Therefore, in the embodiment in which the protrusion is provided on the inner peripheral wall surface of the locking hole as in the present invention, when the locking claw is inserted into the locking hole, the escape groove for allowing the protrusion to pass is provided as the outer periphery of the locking claw. It is good to provide in the latching convex part which protrudes from a wall surface. In this way, by adopting a configuration in which the protruding portion passes through the escape groove, contact between the protruding projection and the protruding portion around the escape groove can be avoided, so that the protruding portion is hardly damaged by the locking convex portion. . Therefore, the protrusion can reliably contact the outer peripheral wall surface of the locking claw, and can form a complementary recess on the outer peripheral wall surface whose temperature has been raised. Therefore, it is possible to reliably manufacture an assembly in which the second member is assembled to the first member in a state where the looseness is suppressed.

  In the invention according to claim 4, one protrusion protruding from the high heat resistant wall surface is brought into contact with the low heat resistant wall surface, and the temperature of the low heat resistant wall surface is raised to form one complementary recess on the low heat resistant wall surface. It is characterized by doing.

  According to this invention, when there is one protrusion protruding from the high heat resistant wall surface, the force by which the protrusion presses the low heat resistant wall surface is not dispersed. Therefore, the protrusion can apply a high stress to the contact portion of the low heat resistant wall surface. As described above, the shape of the complementary recess formed in the low heat resistant wall surface is a shape that accurately complements the shape of the protrusion. Thereby, the mutual relative displacement of an outer peripheral wall surface and an inner peripheral wall surface is suppressed reliably. Therefore, it is possible to manufacture an assembly in which the second member is assembled to the first member in a state where the looseness is suppressed.

  In the invention according to claim 5, the plurality of protrusions provided side by side in the direction intersecting the axial direction of the locking hole on the high heat resistant wall surface are brought into contact with the low heat resistant wall surface, and the temperature of the low heat resistant wall surface is increased. A plurality of complementary recesses are formed in the low heat-resistant wall surface.

  According to this invention, by arranging a plurality of protrusions in a direction intersecting the axial direction of the locking holes, the protrusions provided side by side suppress the rotation of the locking claws around the axial direction. . Therefore, the protrusions and the complementary recesses that are in close contact with each other include the inner circumferential wall surface of the locking hole and the locking claw in the rotation direction around the axial direction in addition to the axial direction of the locking hole and the direction intersecting the axial direction. Relative displacement with the outer peripheral wall surface can be suppressed. Therefore, it is possible to manufacture an assembly in which the second member is assembled to the first member in a state in which the looseness is reliably suppressed.

  The invention according to claim 6 is characterized in that the protruding portion is formed in a tapered shape in which the cross-sectional area decreases as it goes toward the tip in the protruding direction.

  According to the present invention, the protrusion and the low heat-resistant wall surface in the state before forming the complementary recess by forming the protrusion in a tapered shape in which the cross-sectional area decreases as it goes toward the tip in the protrusion direction. The contact area with can be reduced. For this reason, in a state where a high stress is applied to the contact portion between the protruding portion and the low heat resistant wall surface, the temperature of the low heat resistant wall surface can be raised to form a complementary recess. Therefore, the complementary concave portion is reliably formed on the low heat resistant wall surface, and the complementary concave portion and the protruding portion can be reliably adhered to each other. As described above, the protrusions and the complementary recesses that are more securely attached to each other can reliably suppress the relative displacement between the outer peripheral wall surface of the locking claw and the inner peripheral wall surface of the locking hole. Therefore, it is possible to manufacture an assembly in which the second member is assembled to the first member in a state in which the looseness is reliably suppressed.

  The invention according to claim 7 is characterized in that the locking claw of the second member formed of acrylonitrile-butadiene-styrene resin is locked in the locking hole of the first member formed of polycarbonate resin.

  As in the present invention, acrylonitrile-butadiene-styrene resin and polycarbonate resin have different deflection temperatures under load. Therefore, among these resins, the second member, which is provided with a locking claw with acrylonitrile-butadiene-styrene resin, which is a resin with a low deflection temperature, is provided with a locking hole with polycarbonate resin, which is a resin with a high deflection temperature. Each of the first members to be formed may be formed. When the temperature of the second member is raised to near the deflection temperature under load of acrylonitrile-butadiene-styrene resin, the protrusion made of polycarbonate resin that does not soften near the temperature is formed on the outer peripheral wall surface of the softened locking claw. Can be reliably formed. Therefore, in order to reliably manufacture an assembly in which the second member is assembled to the first member in a state where the looseness is suppressed, the second member is made of acrylonitrile-butadiene-styrene resin, and the first member is made of polycarbonate resin. It is preferable to form.

It is a perspective view which shows the whole image of the assembly by 1st embodiment of this invention. It is a top view of the non-fastening member by a first embodiment of the present invention. It is a figure which shows the structure of the non-fastening member by 1st embodiment of this invention, Comprising: It is the III-III sectional view taken on the line of FIG. It is a figure for demonstrating the characteristic part of a non-fastening member, Comprising: It is the figure which expanded the part shown by the arrow IV of FIG. It is a figure which shows the structure of the fastening member by 1st embodiment of this invention, Comprising: It is (a) front view, (b) side view, (c) back view, (d) bottom view, (e) perspective view. . It is a figure for demonstrating the process of manufacturing the assembly by 1st embodiment of this invention. It is a figure for demonstrating the characteristic part of this invention, Comprising: It is the figure which expanded the part shown by the arrow VII of FIG.6 (c). It is a figure for demonstrating the characteristic part of this invention, Comprising: It is the figure which expanded the part shown by the arrow VIII of FIG.6 (d). It is a top view of the non-fastening member by a second embodiment of the present invention. It is a figure for demonstrating the assembly by 3rd embodiment of this invention, Comprising: (a) The front view of a fastening member, (b) It is a side view of a fastening member.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. Moreover, when only a part of the configuration is described in each embodiment, the other modes described in advance can be applied to the other portions of the configuration. Furthermore, not only the combination of the parts that clearly indicate that the combination is possible in each embodiment, but also the combination of the parts that are not explicitly described is possible unless the combination is particularly troublesome.

(First embodiment)
An assembly 100 manufactured according to the first embodiment of the present invention is shown in FIG. This assembly 100 inserts the locking claw 41 provided in the fastening member 40 into the locking hole 21 provided in the non-fastening member 20 and locks the fastening member 40 in the non-fastening member 20. It is manufactured by being assembled to the fastening member 20. First, the configuration of the non-fastening member 20 and the fastening member 40 will be described below.

  First, the structure of the non-fastening member 20 is demonstrated based on FIGS.

  The non-fastening member 20 is formed of, for example, a thermoplastic resin such as polycarbonate (PC) resin, and includes inner peripheral wall surfaces 24 a and 24 b and a protruding portion 25 in addition to the above-described locking holes 21. The locking hole 21 is a hole in which the cross section in the direction orthogonal to the axial direction is a rectangular cross section having a long shape, and penetrates the non-fastening member 20. A part of the fastening member 40 is secured to the peripheral portions 22a and 23 of the pair of openings 22 and 23 formed by the locking holes 21 by locking the fastening member 40 (see FIG. 1) to the non-fastening member 20. Can contact. The locking hole 21 is formed by four inner peripheral wall surfaces extending from one opening 22 to the other opening 23 along the axial direction of the locking hole 21.

  One of the four inner peripheral wall surfaces that form these locking holes 21 is an inner peripheral wall surface 24 a on which the protrusion 25 is formed. The inner peripheral wall surface 24a is one of a pair of outer peripheral wall surfaces 44a and 44b extending along the longitudinal direction of the opening 22 (see FIG. 2). Further, in the direction in which the outer peripheral wall surfaces 44a and 44b are separated from each other, the locking hole 21 is configured to be easily expanded by an external force. The deformation of the locking hole 21 is due to the elasticity of the non-fastening member 20. The reason why such a structure is adopted is to allow the engaging claw 41 to be smoothly inserted when the engaging claw 41 is inserted into the engaging hole 21.

  One protrusion 25 protrudes from the inner peripheral wall surface 24a toward the other opposing outer peripheral wall surface 44b along the direction orthogonal to the surface direction of the inner peripheral wall surface 24a (for example, about 0.2 mm). . The protrusion 25 is formed so that the shape in a cross section along the axial direction of the locking hole 21 and perpendicular to the inner peripheral wall surface 24a is a triangle, and the taper is reduced so that the cross-sectional area decreases toward the tip in the protruding direction. It has a shape. Further, the base portion of the protrusion 25 has a length (see FIG. 3) along the axial direction of the locking hole 21 that is longer than a length along the longitudinal direction of the opening 22 (see FIG. 2). Is formed.

  Next, based on FIG. 5, the structure of the fastening member 40 is demonstrated, referring FIG.2 and FIG.3.

  The fastening member 40 is made of acrylonitrile-butadiene-styrene (ABS) resin, which is a resin material different from that of the non-fastening member 20. This ABS resin is a resin material having a deflection temperature under load (see JIS K 6300, etc.), which is one of the indices indicating the heat resistance of a resin material, lower than that of PC resin. It will be in the state in which plastic deformation by receiving is possible. Specifically, the deflection temperature under load of the ABS resin is about 90 ° C., and the deflection temperature under load of the PC resin is about 130 ° C.

  The fastening member 40 has a head portion 42 in addition to the locking claw 41 described above. The locking claw 41 extends from the head 42 and is supported by the head 42 at the base end in the extending direction. The locking claw 41 can be inserted into the locking hole 21 in a direction in which the extending direction is along the axial direction of the locking hole 21. The cross-sectional shape of the locking claw 41 in the direction orthogonal to the extending direction corresponds to the shape of the locking hole 21 in the direction orthogonal to the axial direction, and is a rectangular shape. In addition, the distal end of the locking claw 41 in the extending direction is formed in a tapered shape with a gradually decreasing cross-sectional area toward the end surface of the distal end so that the insertion into the opening 22 of the locking hole 21 is facilitated. .

  In addition, the locking claw 41 includes an insertion main body 43, an outer peripheral wall surface 44a, a locking projection 47, a relief groove 48, and the like. The insertion main body 43 is a quadrangular columnar portion that is positioned inside the locking hole 21 when the locking claw 41 is inserted into the locking hole 21 and has four outer peripheral wall surfaces. Of these four outer peripheral wall surfaces, the one that faces the inner peripheral wall surface 24a of the locking hole 21 by inserting the locking claw 41 into the locking hole 21 is the outer peripheral wall surface that faces the outer peripheral wall surface 44a and the inner peripheral wall surface 24b. The wall surface 44b.

  Of these outer peripheral wall surfaces 44a, 44b, the outer peripheral wall surface 44a comes into contact with the tip in the protruding direction of the protruding portion 25 protruding from the inner peripheral wall surface 24a by the insertion of the locking claw 41 into the locking hole 21. Note that the direction perpendicular to the extending direction of the locking claw 41 and along the outer peripheral wall surface 44a is the longitudinal direction of the locking claw 41 (see FIGS. 5A and 5C). Moreover, let the direction orthogonal to the outer peripheral wall surface 44a be the thickness direction of the locking claw 41 (see FIG. 5B).

  A pair of locking projections 47 are provided at the distal ends of the locking claws 41 in the extending direction. The pair of locking projections 47 protrude from the outer peripheral wall surface 44 a and the outer peripheral wall surface 44 b in directions opposite to each other along the thickness direction of the locking claw 41. In the thickness direction of the locking claw 41, the length between the front end surfaces of the locking projections 47 in the protruding direction is made larger than the length in the width direction of the opening 22 of the locking hole 21. Each locking projection 47 is formed with an end face 47 a that faces the head 42 and can contact the peripheral edge 22 a of the opening 23. Each locking projection 47 has its end surface 47a in contact with the peripheral edge 23a of the opening 23 on the side opposite to the side on which the locking claw 41 is inserted, thereby separating from the locking hole 21. The movement of the locking claw 41 can be restricted.

  The escape groove 48 is formed in the locking convex portion 47 that protrudes from the outer peripheral wall surface 44 a facing the inner peripheral wall surface 24 a among the pair of locking convex portions 47. The escape groove 48 is located at the center of the outer peripheral wall surface 44a in the longitudinal direction of the locking claw 41, and is provided at a position corresponding to the position where the protrusion 25 is provided on the inner peripheral wall surface 24a (FIG. 5 ( a) and (d)). The escape groove 48 is formed along the extending direction of the locking claw 41. By inserting the extending direction of the locking claw 41 along the axial direction of the locking hole 21 during insertion, the shaft of the locking hole 21 is formed. It becomes a groove extending along the direction. Further, the inner method of the cross section of the relief groove 48 in the direction orthogonal to the extending direction of the locking claw 41 is made larger than the outer method of the protruding portion 25 when the protruding portion 25 is projected along the axial direction. . Therefore, the dimension of the protrusion 25 in the height direction is smaller than the dimension of the relief groove 48 in the depth direction (for example, about 0.25 millimeter). Thereby, the protrusion 25 can pass through the escape groove 48 by inserting the locking claw 41 into the locking hole 21.

  The head portion 42 is formed larger than the opening 22 of the locking hole 21 so as not to enter the locking hole 21. The head 42 is formed with an end surface 42 a that faces the end surface 47 a of the locking projection 47 in the extending direction of the locking claw 41. The end surface 42 a can be restricted from moving the locking claw 41 in the insertion direction by contacting the peripheral edge 22 a of the opening 22 of the locking hole 21.

  The operation of assembling the fastening member 40 to the non-fastening member 20 described so far, and further detailed configurations of the non-fastening member 20 and the fastening member 40 will be described below with reference to FIGS.

  When insertion of the locking claw 41 of the fastening member 40 into the locking hole 21 of the non-fastening member 20 is started, the distal end of the locking claw 41 formed in a tapered shape and the peripheral edge 22a of the opening 22 are formed. Contact (FIG. 6 (a)). If the insertion of the locking claw 41 into the locking hole 21 is continued, the dimension d1 in the thickness direction of the locking projection 47 (see FIG. 5B) rather than the dimension D1 in the width direction of the opening 22 (see FIG. 4). )) Is large, the opening 22 is expanded in the width direction along the tapered shape at the tip of the locking claw 41 (FIG. 6B). The locking claw 41 fits into the locking hole 21 while expanding the inner circumferential wall surface 24b away from the opposed inner circumferential wall surface 24a.

  Further, when the insertion of the locking claw 41 into the locking hole 21 is continued, the protrusion 25 passes through the escape groove 48 formed in the locking projection 47. According to the fact that the dimension in the depth direction of the escape groove 48 is made larger than the dimension in the height direction of the projection 25, the projection 25 does not contact the locking projection 47, Can pass through. And the latching convex part 47 comes out of the latching hole 21 from the opening 23 of the latching hole 21 (FIG.6 (c)). According to detachment of the locking projection 47 that has pushed the locking hole 21 in the width direction from the locking hole 21, the locking hole 21 has a dimension in the width direction and insertion of the locking claw 41 is started. It tries to return to dimension D1 before.

  Here, the dimension D2 between the tip in the protruding direction of the protrusion 25 and the inner peripheral wall surface 24b in a state where no stress is applied to each inner peripheral wall surface 24a, 24b is between the outer peripheral wall surface 44a and the outer peripheral wall surface 44b. It is smaller than the dimension d2 in the thickness direction (see FIG. 5B). Therefore, when the shape of the locking hole 21 is restored, the tip in the protruding direction of the protrusion 25 is in contact with the outer peripheral wall surface 44a of the locking claw 41, and stress is applied to the contact portion of the outer peripheral wall surface 44a. (FIG. 7).

  On the other hand, the locking protrusion 47 that has passed through the locking hole 21 is brought into contact with the peripheral edge 23 b of the opening 23 to restrict the end of the locking claw 41 from the locking hole 21. Further, the end surface 42a of the head portion 42, which faces the end surface 47a of the locking convex portion 47 in the extending direction of the locking claw 41, also contacts the peripheral edge portion 22a of the opening 22, so that the locking claw 41 moves in the insertion direction. To regulate.

  The protrusion 25 is brought into contact with the outer peripheral wall surface 44a by locking the locking claw 41 in the locking hole 21 through the above steps. Thus, the outer peripheral wall surface 44a is heated by heating the fastening member 40 in a state where the protruding portion 25 and the outer peripheral wall surface 44a are in contact with each other. Specifically, in a heating furnace set to an ambient temperature of, for example, 70 ° C. or more near the 90 ° C. load deflection temperature of the ABS resin and lower than the load deflection temperature of the PC resin is 100 ° C. or less. The non-fastening member 20 and the fastening member 40 are inserted. Thereby, as the temperature of the outer peripheral wall surface 44a approaches 90 ° C., which is the deflection temperature under load of the ABS resin forming the fastening member 40, the outer peripheral wall surface 44a becomes in a state capable of plastic deformation. At this time, the inner peripheral wall surface 24a on which the protrusion 25 is formed is a resin material different from the outer peripheral wall surface 44a, and is formed of a PC resin having a deflection temperature under load of about 130 ° C., so that plastic deformation is possible. It will not be a state. In this way, by forming the inner peripheral wall surface 24a and the outer peripheral wall surface 44a with resin materials having different deflection temperatures under load, only the outer peripheral wall surface 44a can be made in a plastically deformable state.

  When the temperature of the outer peripheral wall surface 44a is increased, the protrusions 25 are gradually buried in the outer peripheral wall surface 44a (FIGS. 6D and 8). And the complementary recessed part 45 which is a hollow of the shape which complements the projection part 25 is formed in the part which was contacting the projection part 25 of the outer peripheral wall surface 44a. The complementary recess 45 is formed by plastic deformation of the outer peripheral wall surface 44a pushed by the protrusion 25, and thus complements the shape of the protrusion 25 accurately. Therefore, the protrusion 25 and the complementary recess 45 are in close contact with each other. Thus, the assembly of the fastening member 40 to the non-fastening member 20 is completed, and the assembly 100 is manufactured.

  According to the first embodiment described so far, the complementary recessed portion 45 having a shape that accurately complements the shape of the protruding portion 25 is formed on the outer peripheral wall surface 44 a and is in close contact with the protruding portion 25. Therefore, the inner peripheral wall surface 24a of the locking hole 21 and the outer peripheral wall surface 44a of the locking claw 41 are hardly displaced relative to each other both in the axial direction of the locking hole 21 and in the direction intersecting with the axial direction.

  In addition, in the first embodiment, since the protrusion 25 passes through the escape groove 48, it is possible to avoid contact between the protrusions 25 around the escape groove 48 and the protrusions 25. 25 becomes difficult to be damaged. Therefore, the protrusion 25 can reliably contact the outer peripheral wall surface 44a of the locking claw 41, and the complementary concave portion 45 can be formed in the outer peripheral wall surface 44a whose temperature has been raised. Thereby, the relative displacement of the outer peripheral wall surface 44a and the inner peripheral wall surface 24a is reliably suppressed.

  Moreover, according to 1st embodiment, the force which the projection part 25 presses the outer peripheral wall surface 44a of the latching claw 41 is not disperse | distributed because the projection part 25 which protrudes from the inner peripheral wall surface 24a of the locking hole 21 is one. . Therefore, the protrusion 25 can apply high stress to the contact portion of the outer peripheral wall surface 44a. As described above, the shape of the complementary recess 45 formed in the outer peripheral wall surface 44a is a shape that accurately complements the shape of the protrusion 25. Thereby, the relative displacement of the outer peripheral wall surface 44a and the inner peripheral wall surface 24a is reliably suppressed.

  Further, according to the first embodiment, the protrusion 25 is tapered before the complementary recess 45 is formed by reducing the cross-sectional area toward the tip in the protruding direction. 25 and the contact area between the outer peripheral wall surface 44a can be reduced. For this reason, in the state which applied the high stress to the contact part of the projection part 25 and the outer peripheral wall surface 44a, the outer peripheral wall surface 44a can be heated up and the complementary recessed part 45 can be formed. Therefore, the complementary recessed part 45 is reliably formed in the outer peripheral wall surface 44a, and the complementary recessed part 45 and the projection part 25 can be reliably adhered to each other. As described above, the protrusions 25 and the complementary recesses 45 that are more securely attached to each other ensure relative displacement between the outer peripheral wall surface 44 a of the locking claw 41 and the inner peripheral wall surface 24 a of the locking hole 21. Can be suppressed.

  Therefore, it is possible to manufacture the assembly 100 in which the fastening member 40 is assembled to the non-fastening member 20 in a state where looseness is suppressed without increasing the number of parts for fastening.

  In addition, according to the first embodiment, since the fastening member 40 is heated to raise the temperature of the outer peripheral wall surface 44a, the fastening member 40 can obtain the same effect as the annealing treatment. If it demonstrates in detail, the internal strain at the time of shaping | molding will be accumulate | stored in the fastening member 40 formed of a resin material. By heating the fastening member 40 in such a state to near the deflection temperature at which the plastic deformation can be performed, the internal structure is homogenized and the internal strain is relieved, whereby the residual stress can be removed. This residual stress can cause deformation of the fastening member 40 over time. Therefore, by removing the residual stress of the fastening member 40, the deformation of the fastening member 40 over time can be suppressed. Therefore, the assembly 100 in which the fastening member 40 is assembled to the non-fastening member 20 can maintain the state in which these members 40 and 20 are assembled together without loosening for a long period of time.

  In addition, according to the first embodiment, the inner peripheral wall surfaces 24 a and 24 b of the locking hole 21 are formed so as to be easily spread with the insertion of the locking claw 41. Therefore, when the inner peripheral wall surface 24a of the locking hole 21 is formed of a resin material having a low load deflection temperature, the entire inner peripheral wall surface 24a on which the stress acts by the protrusion 25 is plastically deformed, There is a possibility that the complementary recess 45 is not formed.

  Therefore, by forming the inner peripheral wall surface 24a of the locking hole 21 from a resin material having a high deflection temperature, plastic deformation of the entire inner peripheral wall surface 24a due to the temperature rise for forming the complementary recess 45 is obviated. It can be prevented. Therefore, the complementary recess 45 can be reliably formed on the outer peripheral wall surface 44 a of the locking claw 41 by pressing the protrusion 25. As described above, in order to reliably form the complementary recess 45, it is preferable to form the inner peripheral wall surface 24a of the locking hole 21 from a resin material having a high deflection temperature under load.

  And as a combination of the resin material which forms the non-fastening member 20 and the fastening member 40, the combination of ABS resin and PC resin like 1st embodiment is good. By raising the temperature of the fastening member 40 to near 90 ° C., which is the deflection temperature under load of the ABS resin, the protruding portion 25 made of PC resin that does not soften in the vicinity of the temperature is formed on the outer peripheral wall surface 44 a of the softened locking claw 41. The complementary recess 45 can be reliably formed. Therefore, in order to reliably manufacture the assembly 100 in which the fastening member 40 is assembled to the non-fastening member 20 in a state where the looseness is suppressed, the fastening member 40 is formed of ABS resin and the non-fastening member 20 is formed of PC resin. It is preferable to do.

  Furthermore, in the first embodiment, after the complementary recess 45 is formed, even when the fastening member 40 is removed from the non-fastening member 20, the fastening member 40 is again locked to the non-fastening member 20, thereby The complementary recesses 45 can be in close contact with each other. Therefore, even if it is a case where attachment / detachment of the fastening member 40 to the non-fastening member 20 is repeated, the fastening member 40 can be returned to the assembly 100 in a state where the fastening member 40 is attached to the non-fastening member 20 in a state where looseness is suppressed. it can.

  In the first embodiment, the non-fastening member 20 is described in the “first member” described in the claims, the inner peripheral wall surface 24a is described in the “high heat resistant wall surface” in the claims, and the fastening member 40 is described in the claims. The outer peripheral wall surface 44a corresponds to the “low heat resistant wall surface” recited in the claims.

(Second embodiment)
The second embodiment of the present invention shown in FIG. 9 is a modification of the first embodiment. Two protrusions 225 substantially the same as the protrusions 25 of the first embodiment are formed on the inner peripheral wall surface 224a of the non-fastening member 220 according to the second embodiment. These two protrusions 225 are provided along the longitudinal direction of the opening 222 of the locking hole 221 in a direction intersecting the axial direction of the locking hole 221 on the inner peripheral wall surface 224a of the locking hole 221. ing.

  When the fastening member 40 is inserted into the non-fastening member 220, the two protruding portions 225 are in contact with the outer peripheral wall surface 44a of the fastening member 40. Under this state, similarly to the first embodiment, by heating the non-fastening member 220 and the fastening member 40 to raise the temperature of the outer peripheral wall surface 44a, two complementary recesses 245 are formed in the outer peripheral wall surface 44a.

  By providing two protrusions 225 side by side as in the second embodiment described so far, the protrusions 225 provided side by side rotate the locking claw 41 around the locking hole 221 in the axial direction. Suppress. Therefore, the protrusion 225 and the complementary recess 245 that are in close contact with each other include the inner peripheral wall surface 224a and the outer peripheral wall surface 44a in the rotation direction around the axial direction in addition to the axial direction of the locking hole 221 and the direction intersecting the axial direction. Relative displacement can be suppressed. Therefore, it is possible to manufacture the assembly 200 in which the fastening member 40 is assembled to the non-fastening member 220 in a state where the looseness is reliably suppressed.

  In the second embodiment, the non-fastening member 220 corresponds to the “first member” recited in the claims, and the inner peripheral wall surface 224a corresponds to the “high heat resistant wall surface” recited in the claims.

(Third embodiment)
The third embodiment of the present invention shown in FIG. 10 is another modification of the first embodiment. In the third embodiment, the non-fastening member 320 is formed of an ABS resin that is a resin material having a low load deflection temperature. Further, the fastening member 340 is formed of a PC resin that is a resin material having a high deflection temperature under load. Hereinafter, the configuration of the non-fastening member 320 and the fastening member 340 according to the third embodiment will be described in detail.

  The inner peripheral wall surface 324a of the locking hole 321 of the non-fastening member 320 is not provided with a configuration corresponding to the protruding portion 25 of the first embodiment. On the other hand, a protrusion 345 corresponding to the protrusion 25 of the first embodiment is provided on the outer peripheral wall surface 344a of the locking claw 341 of the fastening member 340. The protrusion 345 is located at the center in the longitudinal direction of the locking claw 341 (FIG. 10A), and the shape thereof is substantially the same as the protrusion 25 of the first embodiment. When the locking claw 341 is locked in the locking hole 321, the protruding portion 345 has a shape that protrudes toward the inner peripheral wall surface 324a that faces the outer peripheral wall surface 344a, and contacts the inner peripheral wall surface 324a. To do. The configuration corresponding to the relief groove 48 provided in the locking projection 47 of the first embodiment corresponding to the provision of the protrusion 345 on the locking claw 341 is the same as the locking groove of the third embodiment. The nail 341 is not formed.

  By engaging the locking claw 341 of the fastening member 340 with the above configuration in the locking hole 321 of the non-fastening member 320, the protruding portion 345 comes into contact with the inner peripheral wall surface 324a. In this state, the inner peripheral wall surface 324a is heated by heating the non-fastening member 320 in a state where the protrusion 345 and the inner peripheral wall surface 324a are in contact with each other. As the temperature of the inner peripheral wall surface 324a approaches 90 ° C., which is the deflection temperature under load of the ABS resin forming the non-fastening member 320, the inner peripheral wall surface 324a becomes in a state that can be plastically deformed. At this time, the outer peripheral wall surface 344a on which the protrusion 345 is provided is formed of PC resin, so that it cannot be plastically deformed. Thus, by forming the inner peripheral wall surface 324a and the outer peripheral wall surface 344a with resin materials having different deflection temperatures under load, only the inner peripheral wall surface 324a can be made in a plastically deformable state.

  When the temperature of the inner peripheral wall surface 324a is increased in a state where the protruding portion 345 is in contact, the protruding portion 345 is gradually buried in the inner peripheral wall surface 324a (FIG. 10B). And the complementary recessed part 325 which is a hollow of the shape which complements the projection part 345 is formed in the part which was contacting the projection part 345 of the outer peripheral wall surface 344a. The complementary recess 325 is formed by plastic deformation of the inner peripheral wall surface 324a pushed by the protrusion 345, and thus accurately complements the shape of the protrusion 345. Therefore, the protrusion 345 and the complementary recess 325 are in close contact with each other. Thus, the assembly of the fastening member 340 to the non-fastening member 320 is completed, and the assembly 300 is manufactured.

  As in the third embodiment described so far, the fastening member 340 may be provided with the protruding portion 345 and the complementary recessed portion 325 may be formed on the inner peripheral wall surface 324a of the non-fastening member 320. Even if it is such a form, the projection part 345 forms the complementary recessed part 325 of the shape which complemented the shape correctly, and can closely_contact | adhere with the said complementary recessed part 325. FIG. Therefore, the inner peripheral wall surface 324a of the locking hole 321 and the outer peripheral wall surface 344a of the locking claw 341 are hardly displaced relative to each other both in the axial direction of the locking hole 321 and in the direction intersecting with the axial direction. Therefore, the assembly 300 in which the fastening member 340 is assembled to the non-fastening member 320 can be manufactured without increasing the number of parts for fastening.

  In the third embodiment, the non-fastening member 320 is described in the “first member” described in the claims, the inner peripheral wall surface 324a is described in the “low heat resistant wall surface” in the claims, and the fastening member 340 is described in the claims. The outer peripheral wall surface 344a corresponds to the “high heat resistant wall surface” recited in the claims.

(Other embodiments)
As mentioned above, although one Embodiment of this invention was described, this invention is limited to this embodiment and is not interpreted and can be applied to various embodiment within the range which does not deviate from the summary.

  In the first and second embodiments, the non-fastening member is formed of a PC resin having a high load deflection temperature, and the fastening member is formed of an ABS resin having a low load deflection temperature. In the third embodiment, the non-fastening member is formed of an ABS resin having a low load deflection temperature, and the fastening member is formed of a PC resin having a high load deflection temperature. As described above, as long as the deflection temperatures under load of the materials forming the non-fastening member and the fastening member are different from each other, either the deflection temperature under load of the non-fastening member or the fastening member may be high.

  Moreover, in the said embodiment, although PC resin was used as a resin material with a high load deflection temperature, and ABS resin was used as a resin material with a low load deflection temperature, respectively, the material of a non-fastening member and a fastening member was demonstrated. There is no limitation to these resins. Furthermore, the form using the thermoplastic resin etc. which are hard to produce the softening by a heat | fever as a resin material with a high deflection temperature under load may be sufficient.

  In the first and third embodiments, only one protrusion is formed on the wall surface on the side having a higher heat resistance temperature. On the other hand, in the second embodiment, two protrusions are formed on the wall surface on the side having a higher heat resistance temperature. However, the number and arrangement of the protrusions formed on the inner peripheral wall surface of the locking hole or the outer peripheral wall surface of the locking claw are not limited to those in the above embodiment. For example, three or more protrusions may be formed, and may not be located at the center of the locking hole opening or the locking claw in the longitudinal direction.

  In the said embodiment, the projection part was made into the taper shape from which a cross-sectional area reduces as it goes to the front-end | tip of a protrusion direction. However, the shape of the protruding portion is not limited to the shape of the above embodiment, and may be, for example, a hemispherical protruding portion or a rectangular columnar protruding portion.

  In the above, the example which applied this invention to the method of manufacturing the assembly of the general purpose structure which assembles | attaches a fastening member to a non-fastening member was demonstrated. However, the present invention is not limited to the assembly as in the above embodiment, and may be applied to a structure including various fastening structures. For example, it may be used for a decorative part that is small and difficult to be fastened with screws, specifically, an ornament indicating the manufacturer of the vehicle in the vehicle. In a vehicle with a lot of vibration, looseness generated between members can be a factor in generating noise. Therefore, the present invention can further exert the effect of assembling members without loosening by being used for manufacturing an assembly used in a vehicle.

20, 220, 320 Non-fastening member (first member), 21, 221, 321 Locking hole, 22, 23, 222 Opening, 22a, 23a Peripheral part, 24a, 224a Inner peripheral wall surface (high heat resistant wall surface), 24b Peripheral wall surface, 324a Inner peripheral wall surface (low heat resistant wall surface), 25, 225 Projection, 325 Complementary recess, 40, 340 Fastening member (second member), 41, 341 Locking claw, 42 Head, 42a End surface, 43 Insertion Main body, 44a outer peripheral wall surface (low heat resistant wall surface), 44b outer peripheral wall surface, 344a outer peripheral wall surface (high heat resistant wall surface), 45, 245, 345 complementary concave portion, 47 locking convex portion, 47a end surface, 48 escape groove, 100, 200, 300 assembly

Claims (7)

By inserting a locking claw provided in the second member into a locking hole provided in the first member and locking the locking member in the locking hole, the second member is assembled to the first member. A method of manufacturing comprising:
The inner peripheral wall surface of the locking hole and the outer peripheral wall surface facing the inner peripheral wall surface in the locking claw are formed of resin materials having different load deflection temperatures,
Of the inner peripheral wall surface and the outer peripheral wall surface, a low heat resistance wall formed by a resin material having a low load deflection temperature among the inner peripheral wall surface and the outer peripheral wall surface. Providing a protrusion that protrudes toward the heat-resistant wall,
The protrusion is complemented to the low heat-resistant wall surface by raising the temperature of the low heat-resistant wall in a state where the protrusion is brought into contact with the low heat-resistant wall surface by engaging the locking claw with the locking hole. A method for manufacturing an assembly is provided, wherein a complementary recess having a shape to be formed is formed. The low heat resistant wall surface is the outer peripheral wall surface of the locking claw,
The high heat resistant wall surface is the inner peripheral wall surface of the locking hole,
The method of manufacturing an assembly according to claim 1, wherein the complementary concave portion having a shape complemented by the protrusion is formed on the outer peripheral wall surface by raising the temperature of the outer peripheral wall surface. In the locking claw,
A locking projection that protrudes from the outer peripheral wall surface and can abut on the peripheral edge of the opening opposite to the side where the locking claw is inserted, of the pair of openings of the locking hole that penetrates the first member. When,
Forming a relief groove extending along the axial direction of the locking hole in the locking projection,
3. The method of manufacturing an assembly according to claim 2, wherein the protruding portion passes through the escape groove by inserting the locking claw into the locking hole.   One of the protrusions protruding from the high heat resistant wall surface is in contact with the low heat resistant wall surface, and the temperature of the low heat resistant wall surface is raised to form one complementary recess in the low heat resistant wall surface. The manufacturing method of the assembly as described in any one of Claims 1-3.   In the high heat resistant wall surface, a plurality of the protrusions arranged in a direction intersecting the axial direction of the locking hole are brought into contact with the low heat resistant wall surface, and the low heat resistant wall surface is heated to increase the temperature. The method for manufacturing an assembly according to any one of claims 1 to 3, wherein a plurality of the complementary recesses are formed on a low heat resistant wall surface.   The method of manufacturing an assembly according to claim 1, wherein the protruding portion is formed in a tapered shape in which a cross-sectional area decreases as it goes toward a tip in a protruding direction.   The locking claw of the second member formed of acrylonitrile-butadiene-styrene resin is locked in the locking hole of the first member formed of polycarbonate resin. A method for manufacturing the assembly according to claim 1.

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