Press-fit fixing structure

Abstract

To obtain a press-fit fixing structure that can stabilize the axial force of a fastening member inserted into a metal fastening member that is press-fitted into a through-hole formed in a resin part. [Solution] At one end of the through-hole 22, a burr containment space 26 is provided between the inner circumferential surface 22B1 of the through-hole 22 and the outer circumferential surface 24A of the collar 24 to accommodate burrs 28 generated from the dash panel 20.

Description

Technical Field

[0001] The present invention relates to a press-fitting and fixing structure.

Background Art

[0002] Patent Document 1 below discloses an invention related to a press-fitting and fixing structure of a resin member with a metal collar. In this press-fitting and fixing structure of a resin member with a metal collar, a cylindrical main body of the metal collar (fastening member) is press-fitted into a through-hole formed in the resin member, and the metal collar and the resin member are joined with an adhesive. And a shaft portion of the fastening member is inserted through this metal collar.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, depending on the dimensions and manufacturing accuracy of the main body of the metal collar and the through-hole of the resin member, burrs may be generated when the main body of the metal collar is press-fitted into the through-hole of the resin member. And when fastening the fastening member, it is considered that the fastening member may bite into this burr, making it difficult to stabilize the axial force of this fastening member.

[0005] However, in the above prior art, no countermeasure is taken against the generation of burrs when the main body of the metal collar is press-fitted into the through-hole of the resin member, and there is room for improvement in terms of stabilizing the axial force of the fastening member.

[0006] In consideration of the above facts, an object of the present invention is to obtain a press-fitting and fixing structure capable of stabilizing the axial force of a fastening member inserted into a metal fastening member press-fitted into a through-hole formed in a resin part.

Means for Solving the Problems

[0007] The press-fit fixing structure according to the first embodiment comprises a resin part having a through portion formed therein, and a cylindrical metal fastening member press-fitted into the through portion, wherein a burr-receiving space is secured at one end of the through portion between the inner circumferential surface of the through portion and the outer circumferential surface of the fastening member to accommodate burrs generated from the resin part.

[0008] According to the press-fit fixing structure of the first embodiment, a through-hole is formed in the resin part, and a cylindrical metal fastening member is press-fitted into this through-hole.

[0009] Incidentally, depending on the dimensions and manufacturing precision of the fastening members and the penetrations of the resin parts, burrs may be generated when the fastening member is press-fitted into the penetration of the resin part. Furthermore, when fastening a fastening member by inserting it into the fastening member, the fastening member may bite into the burrs generated in the penetration of the resin part, making it difficult to stabilize the axial force of the fastening member.

[0010] In this embodiment, a burr-receiving space is provided at one end of the through-hole of the resin part, between the inner circumferential surface of the through-hole and the outer circumferential surface of the fastening member, to accommodate burrs generated from the resin part.

[0011] Therefore, in this embodiment, even if burrs are generated when the fastening member is press-fitted into the penetration of the resin member, these burrs will be contained within the burr containment space. As a result, when fastening a fastening member by inserting it into the fastening member, it is possible to suppress the fastening member from biting into the burrs generated in the penetration of the resin member.

[0012] The press-fit fixing structure according to the second embodiment is the press-fit fixing structure according to the first embodiment, wherein the through portion has an enlarged diameter portion at one end, and the burr-receiving space is secured between the inner circumferential surface of the enlarged diameter portion and the outer circumferential surface.

[0013] According to the press-fit fixing structure of the second embodiment, the through portion formed in the resin member has an enlarged diameter portion at one end thereof, where the inner diameter is larger. A burr-receiving space is secured between the inner circumferential surface of the enlarged diameter portion and the outer circumferential surface of the fastening member.

[0014] Therefore, when a fastening member is press-fitted into the penetration portion of the resin member from the other end of the penetration portion, any burrs generated on the inner circumference of the penetration portion will be contained within the burr-receiving space secured between the inner circumference of the enlarged diameter portion and the outer circumference of the fastening member.

[0015] The press-fit fixing structure according to the third embodiment is a press-fit fixing structure according to the first embodiment, wherein the fastening member has a reduced diameter portion at one end, and the burr-receiving space is secured between the inner circumferential surface and the outer circumferential surface of the reduced diameter portion.

[0016] According to the press-fit fixing structure of the third embodiment, the fastening member has a reduced-diameter portion at one end of the through-hole formed in the resin member, where the outer diameter is smaller. A burr-receiving space is secured between the inner circumferential surface of the through-hole and the outer circumferential surface of the reduced-diameter portion.

[0017] Therefore, when a fastening member is press-fitted into the penetration of the resin member from the other end of the penetration, any burrs generated on the inner circumference of the penetration will be contained within the burr-receiving space secured between the inner surface of the penetration and the outer surface of the reduced-diameter portion of the fastening member. [Effects of the Invention]

[0018] As described above, the press-fit fixing structure according to the present invention has the excellent effect of being able to stabilize the axial force of a fastening member inserted into a metal fastening member that is press-fitted into a penetration formed in a resin part. [Brief explanation of the drawing]

[0019] [Figure 1] This is a schematic exploded perspective view showing the configuration of the front part of the vehicle body to which the press-fit fixing structure according to the first embodiment is applied. [Figure 2] It is a front view schematically showing the configuration of a dash panel of a vehicle body to which the press-fitting and fixing structure according to the first embodiment is applied. [Figure 3] It is a cross-sectional view schematically showing the configuration of a main part of a vehicle body to which the press-fitting and fixing structure according to the first embodiment is applied (a cross-sectional view showing a state cut along line 3-3 in FIG. 2). [Figure 4] It is a cross-sectional view schematically showing the press-fitting process of a fastening member in a vehicle body to which the press-fitting and fixing structure according to the first embodiment is applied, where (A) shows the first step and (B) shows the second step. [Figure 5] It is a cross-sectional view schematically showing the press-fitting process of a fastening member in a vehicle body to which the press-fitting and fixing structure according to the second embodiment is applied, where (A) shows the first step and (B) shows the second step.

Mode for Carrying Out the Invention

[0020] <First Embodiment><000009​​​​​​​​​​​​The side component 14 includes a suspension tower section 14A, a wheelhouse section 14B, and a side member section 14C. The suspension tower section 14A is box-shaped with an open underside and a circular through-hole 18 formed on its upper surface, and supports a shock absorber (not shown).

[0024] The wheel well section 14B is provided integrally with the suspension tower section 14A and has a spherical shape that can accommodate a part of the tire (not shown).

[0025] The side member portion 14C is positioned on the underside of the vehicle body of the suspension tower portion 14A and is integrally provided with the suspension tower portion 14A and the wheel house portion 14B. This side member portion 14C extends in the longitudinal direction of the vehicle body, and when viewed from the front of the vehicle body, its cross-sectional shape is U-shaped with the outer side in the width direction of the vehicle body open.

[0026] On the other hand, the connecting portion 16 has its thickness in the longitudinal direction of the vehicle body and extends in the width direction of the vehicle body, and is positioned along the leading edge of the aforementioned center part, separating the passenger compartment (not shown) and the power unit room 10A on the underside of the vehicle body. Furthermore, the upper peripheral edge of the connecting portion 16 is recessed so as to protrude toward the underside of the vehicle body, and a "dash panel 20," which is a resin part whose main part is made of resin, is positioned in this area.

[0027] As shown in Figure 2, the dash panel 20 has a thickness direction in the longitudinal direction of the vehicle body and is an isosceles trapezoid shape that widens from the lower side to the upper side of the vehicle body when viewed from the longitudinal direction of the vehicle body, and separates the passenger compartment and the power unit room 10A at the upper side of the vehicle body of the connection part 16.

[0028] Furthermore, the dash panel 20 has multiple "through-holes 22" formed around its periphery, and as shown in Figure 3, metal "collars 24" serving as fastening members are attached to these through-holes 22. In this embodiment, the press-fit fixing structure according to this embodiment is applied to attach the collars 24 to the through-holes 22.

[0029] More specifically, the collar 24 is cylindrical with a uniform cross-sectional shape in its axial direction X. On the other hand, the through-section 22 is composed of a general section 22A that constitutes its main part, and an "enlarged diameter section 22B" that constitutes one end of the general section 22A and has a larger inner diameter than the general section 22A.

[0030] Furthermore, the inner circumferential surface 22A1 of the general section 22A is in close contact with the outer circumferential surface 24A of the collar 24, and a burr containment space 26 is secured between the inner circumferential surface 22B1 of the enlarged diameter section 22B and the outer circumferential surface 24A.

[0031] The burr containment space 26 contains the "burrs 28" that were generated inside the through-hole 22 when the collar 24 was pressed in. The dash panel 20 is attached to the front part 12 by inserting the shaft of a fastening member such as a bolt through the collar 24 which is arranged along its periphery, and screwing this shaft into a female threaded part or nut provided on the front part 12.

[0032] Next, the press-fitting process of the collar 24 into the through-hole 22 in this embodiment will be explained using Figure 4. As shown in Figure 4(A), in the first step of this press-fitting process, the collar 24 is heated to approximately the melting point of the resin constituting the dash panel 20, and the collar 24 is positioned relative to the through-hole 22 at the other end of the through-hole 22.

[0033] Furthermore, the general portion 22A of the through portion 22 decreases in diameter from the other end to the one end of the through portion 22 before the collar 24 is pressed in, and the inner diameter of the outermost end of the general portion 22A is set to be approximately 0.9 times the length of the outer diameter of the collar 24. In addition, the inner diameter of the enlarged portion 22B is set to be approximately 1.1 times the length of the outer diameter of the collar 24.

[0034] Then, as shown in Figure 4(B), in the second step of the press-fitting process described above, the collar 24 is press-fitted into the through-hole 22. At this time, although burrs 28 are generated when the resin on the inner circumferential surface 22A1 of the general section 22A is scraped off by the collar 24, the burrs 28 are contained within the burr-receiving space 26 and fixed to the inner circumferential surface 22B1 of the enlarged diameter section 22B.

[0035] (Operation and effects of this embodiment) Next, the operation and effects of this embodiment will be described.

[0036] In this embodiment, as shown in Figures 2 and 3, a through-hole 22 is formed in the dash panel 20, and a cylindrical, metal collar 24 is press-fitted into this through-hole 22.

[0037] Incidentally, depending on the dimensions and manufacturing precision of the collar 24 and the through-hole 22 of the dash panel 20, burrs may be generated when the collar 24 is press-fitted into the through-hole 22. Furthermore, when a fastening member is inserted into the collar 24 and fastened, the fastening member may catch on the burrs generated in the through-hole 22 of the dash panel 20, making it difficult to stabilize the axial force of the fastening member.

[0038] In this embodiment, at one end of the through-hole 22, a burr-receiving space 26 is provided between the inner circumferential surface 22B1 of the through-hole 22 and the outer circumferential surface 24A of the collar 24 to accommodate burrs 28 generated from the dash panel 20.

[0039] Therefore, in this embodiment, even if burrs 28 are generated when the collar 24 is press-fitted into the through-hole 22 of the dash panel 20, these burrs 28 will be contained within the burr-receiving space 26. As a result, when fastening a fastening member is inserted into the collar 24 and fastened, it is possible to suppress the fastening member from biting into the burrs generated in the through-hole 22.

[0040] More specifically, in this embodiment, as also shown in Figure 4(A), the through-hole 22 formed in the dash panel 20 has an enlarged diameter portion 22B at one end. A burr-receiving space 26 is secured between the inner circumferential surface 22B1 of the enlarged diameter portion 22B and the outer circumferential surface 24A of the collar 24.

[0041] Therefore, when the collar 24 is press-fitted into the through-hole 22 of the dash panel 20 from the other end of the through-hole 22, the burrs 28 generated on the inner circumference side of the through-hole 22 will be contained in the burr-receiving space 26 secured between the inner circumference surface 22B1 of the enlarged diameter portion 22B and the outer circumference surface 24A of the collar 24.

[0042] Thus, in this embodiment, the axial force of the fastening member inserted into the metal collar 24, which is press-fitted into the through-hole 22 formed in the dash panel 20, can be stabilized.

[0043] <Second Embodiment> The press-fit fixing structure according to the second embodiment of the present invention will be described below with reference to Figure 5. Note that components identical to those in the first embodiment described above will be given the same reference numerals and their descriptions will be omitted.

[0044] The press-fit fixing structure according to this embodiment is similar to the first embodiment described above in that, as shown in Figure 5(B), metal "collars 32" as fastening members are attached to multiple "through-holes 30" formed on the periphery of the dash panel 20. On the other hand, the configuration of the through-holes 30 and collars 32 differs from that of the first embodiment described above.

[0045] More specifically, the collar 32 is basically cylindrical with a circular cross-section when viewed from the axial direction X, and is composed of a general part 32A that constitutes the main part and a "reduced diameter part 32B" that constitutes one end in the axial direction X and has a smaller outer diameter than the general part 32A.

[0046] On the other hand, before the collar 32 is pressed in, the through portion 30 decreases in diameter from the other end towards the one end, and the inner diameter of the outermost end is set to be about 0.9 times the length of the outer diameter of the general portion 32A of the collar 32.

[0047] Furthermore, a burr containment space 34 is provided between the inner circumferential surface 30A of the through-hole 30 and the outer circumferential surface 32B1 of the reduced diameter portion 32B of the collar 32. The burr containment space 34 contains the burrs 36 that are generated inside the through-hole 30 when the collar 32 is press-fitted.

[0048] Next, the process of press-fitting the collar 32 into the through-hole 30 in the embodiment will be described. As shown in Figure 5(A), in the first step of this press-fitting process, the collar 32 is heated to approximately the melting point of the resin constituting the dash panel 20, and the collar 32 is positioned relative to the through-hole 30 at the other end of the through-hole 30.

[0049] Then, as shown in Figure 5(B), in the second step of the press-fitting process described above, the collar 32 is press-fitted into the through-hole 30. At this time, although burrs 36 are generated as the resin on the inner circumferential surface 30A of the through-hole 30 is scraped by the collar 32, the burrs 36 are contained within the burr-receiving space 34 and are fixed to the part of the through-hole 30 on one end of the inner circumferential surface 30A.

[0050] In this configuration, the collar 32 has a reduced-diameter portion 32B at one end of the through-hole 30 formed in the dash panel 20, where the outer diameter is smaller. A burr-receiving space 34 is secured between the inner circumferential surface 30A of the through-hole 30 and the outer circumferential surface 32B1 of the reduced-diameter portion 32B.

[0051] Therefore, when the collar 32 is press-fitted into the through portion 30 from the other end of the through portion 30, the burr 36 generated on the inner circumference side of the through portion 30 will be contained in the burr-retaining space 34 secured between the inner circumferential surface 30A of the through portion 30 and the outer circumferential surface 32B1 of the reduced diameter portion 32B of the collar 32. In other words, this embodiment also produces the same operation and effect as the first embodiment described above.

[0052] In the embodiments described above, the press-fit fixing structure according to each embodiment was applied to attach the collar to the dash panel 20. However, the press-fit fixing structure according to each embodiment may also be applied to attach the collar to resin members other than the dash panel 20.

[0053] Furthermore, the components attached to the resin component are not limited to collars. For example, the press-fit fixing structure according to each embodiment may be applied to attach tapped blocks or the like to the resin component. [Explanation of symbols]

[0054] 20. Dash panel (plastic parts) 22 Penetration section 22B Expanded diameter part 22B1 Inner surface 24 Collars (fastening components) 24A Outer surface 26 Bali accommodation space 28 Bali 30 Penetration section 30A inner surface 32 Collars (fastening components) 32B Reduced diameter part 32B1 Outer surface 34 Bali accommodation space 36 Bali

Claims

1. A resin part with a through-hole formed there It comprises a cylindrical, metal fastening member that is press-fitted into the aforementioned penetration, At one end of the through-hole, a burr-receiving space is provided between the inner circumferential surface of the through-hole and the outer circumferential surface of the fastening member to accommodate burrs generated from the resin part. Press-fit fixing structure.

2. The aforementioned through portion has an enlarged diameter portion at one end where the inner diameter is larger. The burr containment space is secured between the inner circumferential surface and the outer circumferential surface of the enlarged diameter portion. The press-fit fixing structure according to claim 1.

3. The fastening member has a reduced diameter portion at one end where the outer diameter is smaller. The burr containment space is secured between the inner circumferential surface and the outer circumferential surface of the reduced diameter portion. The press-fit fixing structure according to claim 1.

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