Vehicle fastening structure

Abstract

To provide a vehicle fastening structure in which mechanical fastening with bolts and joining with an adhesive are combined and which can maintain a good-fastened state.SOLUTION: A vehicle fastening structure includes: a bolt hole 36 which is opened in a facing surface 20A of a fastening target member 20 facing a fastened member and into which a bolt can be screwed; a bolt stepped portion 38 protruding from the facing surface 20A toward the fastened member to surround a hole edge of the bolt hole 36 and being in contact with the fastened member; and an adhesive stepped portion 40 which protrudes from the facing surface 20A toward the fastened member and into which an adhesive is placed. The adhesive stepped portion 40 is divided into multiple parts and arranged around the bolt stepped portion 38 with a gap with respect to the bolt stepped portion 38.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vehicle fastening structure. [Background technology]

[0002] Patent Document 1 discloses a fastening structure for a cylinder block and an oil pan in a vehicle engine. Specifically, in a structure in which the oil pan and the cylinder block are fixed with bolts and nuts, an adhesive application surface is provided on the flange of the cylinder block, onto which a sealing adhesive is applied. Patent Document 1 also discloses a groove formed between the adhesive application surface and the fastening hole, through which a release agent can pass. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-316574 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the structure of Patent Document 1, the adhesive application surface is arranged continuously around the flange, which may cause the adhesive to spread to the fastening hole during bonding, making it impossible to maintain a good fastening state of the bolt fastening.

[0005] The present invention aims to provide a vehicle fastening structure that combines mechanical fastening using bolts and joining using an adhesive, and that can maintain a good fastened state. [Means for solving the problem]

[0006] The vehicle fastening structure of claim 1 has a bolt hole that is opened in an opposing surface of a fastening target component that faces a fastened component and into which a bolt can be screwed, a bolt step portion that protrudes from the opposing surface toward the fastened component to surround the edge of the bolt hole and contact the fastened component, and an adhesive step portion that protrudes from the opposing surface and into which adhesive is placed, and the adhesive step portion is divided into multiple parts and arranged around the bolt step portion with gaps between them.

[0007] In the vehicle fastening structure according to claim 1, a bolt hole is opened in the facing surface of the fastening target member that faces the fastened member, and a bolt can be screwed into this bolt hole. A bolt step protrudes from the facing surface of the fastening target member toward the fastened member, surrounding the edge of the bolt hole and contacting the fastened member. An adhesive step protrudes from the facing surface of the fastening target member toward the fastened member, and an adhesive is disposed in the adhesive step. Because the bolt step and the adhesive step protrude from the facing surfaces, respectively, the adhesive can be prevented from spreading around the bolt hole.

[0008] Furthermore, the adhesive step portions are divided into a plurality of portions and arranged around the bolt step portion with gaps between them, so that the adhesive can enter the gaps between adjacent adhesive step portions, preventing the adhesive from spreading to unintended areas and maintaining a good fastening state of the fastening target components.

[0009] The vehicle fastening structure of claim 2 is the same as claim 1, wherein the opposing surfaces include a first opposing surface that faces the fastened member in the vehicle width direction and a second opposing surface that faces the fastened member in the vehicle vertical direction.

[0010] In the vehicle fastening structure of claim 2, the fastening target member is fastened to the fastened portion on two surfaces, the first opposing surface and the second opposing surface, making it possible to attach the fastening target member in the vehicle width direction and the vehicle vertical direction.

[0011] The vehicle fastening structure of claim 3 is the same as claim 2, in which the first opposing surface is provided with a step portion for the bolt and a step portion for the adhesive, and the second opposing surface is provided with at least the step portion for the adhesive.

[0012] In the vehicle fastening structure according to claim 3, a step portion for bolt and a step portion for adhesive are provided on a first opposing surface of the fastening target member that faces the fastened member in the vehicle width direction, so that the fastening can be performed with a bolt and an adhesive on the first opposing surface. Also, at least a step portion for adhesive is provided on a second opposing surface of the fastening target member that faces the fastened member in the vehicle vertical direction, so that the fastening can be performed with at least an adhesive on the second opposing surface.

[0013] The vehicle fastening structure of claim 4 is the same as claim 1, in which the bolt holes are formed in multiple positions along the fore-and-aft direction of the vehicle, and are formed in staggered positions so that adjacent bolt holes are offset in the up-and-down direction of the vehicle.

[0014] In the vehicle fastening structure of claim 4, adjacent bolt holes are formed in staggered positions so that they are offset in the vertical direction of the vehicle, so that the fastening state can be maintained well against external forces input in both the vertical direction and the longitudinal direction of the vehicle, compared to when the bolt holes are arranged in a straight line.

[0015] A vehicle fastening structure according to claim 5 is in any one of claims 1 to 4, wherein the fastening target member is a vehicle frame member formed by die casting and constituting a vehicle frame.

[0016] In the vehicle fastening structure according to claim 5, the fastening target member is a vehicle frame member formed by die-casting, which makes it difficult to join by welding, etc. However, even such a vehicle frame member can be firmly fixed to the fastened member using bolts and adhesive. [Effects of the Invention]

[0017] As described above, the vehicle fastening structure according to the present invention can maintain a good fastened state in a vehicle fastening structure that combines mechanical fastening using bolts and joining using an adhesive. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a front part of a vehicle in which a vehicle fastening structure according to an embodiment is adopted; [Figure 2] 1 is a perspective view showing a vehicle fastening structure according to an embodiment; [Figure 3] FIG. 2 is a perspective view showing a fastening target member in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] A vehicle fastening structure according to an embodiment will be described with reference to the drawings.

[0020] Fig. 1 is a perspective view showing the front of a vehicle employing a vehicle fastening structure according to an embodiment. Note that the arrows FR, UP, and RH in Fig. 1 respectively indicate the vehicle forward direction, vehicle upward direction, and vehicle right direction of a vehicle 10 to which the vehicle fastening structure is applied. In the following description, unless otherwise specified, when the front-rear, up-down, and left-right directions are used, they refer to the front-rear direction of the vehicle, the up-down direction of the vehicle, and the left-right direction (width direction) of the vehicle, respectively.

[0021] As shown in Fig. 1, a vehicle 10 to which the vehicle fastening structure of this embodiment is applied is equipped with a pair of left and right rockers 12. The rockers 12 are provided on both sides in the vehicle width direction and are vehicle frame members that extend in the front-to-rear direction of the vehicle. The rockers 12 correspond to fastened members in the present invention.

[0022] The left and right rockers 12 are connected in the vehicle width direction by a cross member 14 and a cross member 16. The cross member 14 is a long member with a closed cross section structure that extends in the vehicle width direction, with one end fixed to the right rocker 12 and the other end fixed to the left rocker 12. A vehicle seat (not shown) is attached to the cross member 14.

[0023] The cross member 16 is disposed behind the cross member 14 and is an elongated member having a closed cross section and extending in the vehicle width direction. One end of the cross member 16 is fixed to the right rocker 12, and the other end is fixed to the left rocker 12.

[0024] A front module 18, which serves as a fastening target member, is connected to the front end of the rocker 12. The front module 18 is a vehicle frame member formed by die casting that constitutes the frame of the front part of the vehicle. The front module 18 includes a pillar lower section 20, a dash section 22, a front side member section 24, and a suspension tower section 26.

[0025] The pillar lower sections 20 are provided in a pair on the left and right sides and are located at the rear of the front module 18, each extending in the vertical direction of the vehicle. The rocker 12, which serves as a member to be joined, is attached to the pillar lower sections 20. Furthermore, an upper pillar section (not shown) is attached to the upper end of the pillar lower section 20.

[0026] The dash portion 22 connects the left and right pillar lower portions 20 in the vehicle width direction and separates the interior and exterior of the vehicle. A pair of front side member portions 24 are provided on the left and right, each extending from the dash portion 22 toward the front of the vehicle. A bumper reinforcement (not shown) is attached to the front end of the front side member portion 24.

[0027] The suspension tower section 26 is formed in a roughly box shape with an open lower side of the vehicle and a circular hole (not shown) formed on the top surface, and is configured to be able to support a shock absorber (not shown).

[0028] Fig. 2 is a perspective view showing the vehicle fastening structure according to the embodiment, illustrating the fastening portion between the pillar lower portion 20 and the rocker 12. As shown in Fig. 2, the rocker 12 is configured to include an upper surface 12A facing upward in the vehicle, a lower surface 12C facing downward in the vehicle, and a side surface 12B that vertically connects the upper surface 12A and the lower surface 12C.

[0029] A plurality of through holes 12D are formed in the side surface 12B of the rocker 12 on the inner side in the vehicle width direction at the front end thereof. In this embodiment, as an example, four through holes 12D are formed. Each of the four through holes 12D is a circular hole that penetrates the side surface 12B in the plate thickness direction, and is formed alternately above and below along the vehicle front-rear direction. Bolts 100 are inserted into these through holes 12D.

[0030] The pillar lower portion 20 is formed in a shape that contacts the upper surface 12A of the rocker 12 and the outer side surface 12B of the vehicle width direction, so that the lower end of the pillar lower portion 20 is formed in an approximately L-shape when viewed from the front-to-rear direction of the vehicle.

[0031] Fig. 3 is a perspective view showing the pillar lower portion 20 as a fastening target member in the embodiment. As shown in Fig. 3, the pillar lower portion 20 is provided with a first opposing surface 20A that faces the side surface 12B of the rocker 12 in the vehicle width direction, and a second opposing surface 20B that faces the top surface 12A of the rocker in the vehicle up-down direction. In addition, the pillar lower portion 20 has a plurality of ribs 21 that extend from the second opposing surface 20B toward the upper and front of the vehicle.

[0032] Here, a plurality of bolt holes 36 are opened in the first opposing surface 20A of the pillar lower portion 20, and in this embodiment, as an example, four bolt holes 36 are opened. The bolt holes 36 are each formed in a position facing a through hole 12D formed in the rocker 12. Specifically, the bolt holes 36 are formed along the vehicle longitudinal direction, and are also formed in staggered positions such that adjacent bolt holes 36 are shifted in the vehicle vertical direction. These bolt holes 36 are provided with threads into which bolts 100 can be threaded.

[0033] Here, the pillar lower portion 20 has a protruding portion 32 located outward in the vehicle width direction from the first opposing surface 20A, and a cylindrical connecting portion 34 is formed between the protruding portion 32 and the first opposing surface 20A. The cylindrical connecting portion 34 connects the protruding portion 32 and the first opposing surface 20A at the position of the bolt hole 36, and a thread groove is formed on the inner wall of this cylindrical connecting portion 34. In other words, the protruding portion 32 is provided to fasten the pillar lower portion 20 to the rocker 12 with a bolt.

[0034] The first opposing surface 20A is provided with a bolt step 38 and an adhesive step 40. The bolt step 38 protrudes from the first opposing surface 20A inward in the vehicle width direction (toward the rocker 12), and is an annular portion that surrounds the hole edge of the bolt hole 36 and contacts the side surface 12B of the rocker 12. In this embodiment, a bolt step 38 is provided on the hole edge of each of the four bolt holes 36.

[0035] The four bolt step portions 38 are set to protrude from the first opposing surface 20A to approximately the same height, and the surfaces that come into contact with the rocker 12 are formed to be approximately flat. Therefore, when the pillar lower portion 20 and the rocker 12 are assembled, the four bolt step portions 38 are configured to come into surface contact with the side surface 12B of the rocker 12.

[0036] The adhesive step portion 40 protrudes from the first opposing surface 20A toward the inside in the vehicle width direction (toward the rocker 12), and is configured so that an adhesive (not shown) can be placed therein. In addition, the adhesive step portion 40 of this embodiment is divided into multiple portions and placed around the bolt step portion 38 with a predetermined gap between them and the bolt step portion 38. The adhesive placed in the adhesive step portion 40 is not limited to a liquid adhesive that hardens under predetermined conditions, and a wide range of adhesives such as double-sided tape and thermosetting resins can be used.

[0037] In this embodiment, as an example, six adhesive step portions 40 are arranged on the first opposing surface 20A along the vehicle longitudinal direction, with a predetermined gap provided between adjacent adhesive step portions 40. The six adhesive step portions 40 are set to protrude to approximately the same height from the first opposing surface 20A, and are formed slightly lower than the bolt step portion 38.

[0038] The rearmost adhesive step 40 is formed in a substantially rectangular shape. The second adhesive step 40 adjacent to the front of this adhesive step 40 is adjacent to the rear of the rearmost bolt step 38, and its front and lower corners are curved in a substantially arc shape to match the shape of the bolt step 38.

[0039] The third adhesive step 40 adjacent to the front of this adhesive step 40 is adjacent to the front part of the rearmost bolt step 38, and its rear and lower corner is curved in a substantially arc shape to follow the shape of the bolt step 38. In addition, this adhesive step 40 is also adjacent to the rear part of the second-from-rearmost bolt step 38, and its front and upper corner is curved in a substantially arc shape to follow the shape of the bolt step 38.

[0040] The fourth adhesive step 40 adjacent to the front of this adhesive step 40 is adjacent to the front of the second-to-rear bolt step 38, and its rear and upper corner is curved in a substantially arc shape to follow the shape of the bolt step 38. In addition, this adhesive step 40 is also adjacent to the rear of the third-to-rear bolt step 38, and its front and lower corner is curved in a substantially arc shape to follow the shape of the bolt step 38.

[0041] The fifth adhesive step 40 adjacent to the front of this adhesive step 40 is adjacent to the front of the third-rearmost bolt step 38, and its rear and lower corner is curved in a substantially arc shape to follow the shape of the bolt step 38. In addition, this adhesive step 40 is also adjacent to the rear of the fourth-rearmost bolt step 38, and its front and upper corner is curved in a substantially arc shape to follow the shape of the bolt step 38.

[0042] The sixth adhesive step portion 40 adjacent to the front of this adhesive step portion 40 is adjacent to the front of the fourth bolt step portion 38 from the rear, and the rear and upper corner is curved in an approximately arc shape to follow the shape of the bolt step portion 38.

[0043] Further, two recesses 50 are formed in the first opposing surface 20A. One recess 50 is formed in a position adjacent to the rearmost bolt step portion 38, and the other recess 50 is formed in a position adjacent to the third bolt step portion 38 from the rearmost.

[0044] On the other hand, a plurality of bolt step portions 44 and a plurality of adhesive step portions 42 are provided on the second opposing surface 20B of the pillar lower portion 20. The bolt step portions 44 and the adhesive step portions 42 protrude from the second opposing surface 20B toward the lower side of the vehicle (the rocker 12 side), and are configured so that an adhesive (not shown) can be placed thereon.

[0045] The bolt step portions 44 are provided at two locations, at the front and rear of the second opposing surface 20B, and are each formed in a substantially rectangular shape. Each bolt step portion 44 is formed so as to surround the edge of the bolt hole 52.

[0046] In this embodiment, five adhesive step portions 42 are provided along the vehicle front-rear direction, and a predetermined gap is provided between adjacent adhesive step portions 42. The five adhesive step portions 42 are set to protrude to approximately the same height from the second opposing surface 20B and are formed slightly lower than the bolt step portion 44.

[0047] The five adhesive step portions 42 are formed in substantially the same rectangular shape. A bolt step portion 44 is provided between the rearmost adhesive step portion 42 and the second-to-rearmost adhesive step portion 42.

[0048] (action) Next, the operation of the vehicle fastening structure according to this embodiment will be described.

[0049] In the vehicle fastening structure according to this embodiment, a bolt hole 36 is opened in a first opposing surface 20A of the pillar lower portion 20 that faces the rocker 12, and a bolt 100 (see FIG. 2) can be screwed into this bolt hole 36. In addition, a bolt step 38 protrudes from the first opposing surface 20A of the pillar lower portion 20 toward the rocker 12, and the bolt step 38 surrounds the edge of the bolt hole 36 and contacts the rocker 12.

[0050] Furthermore, an adhesive step 40 protrudes from the first opposing surface 20A of the pillar lower portion 20 toward the rocker 12, and adhesive is disposed in the adhesive step 40. Because the bolt step 38 and the adhesive step 40 each protrude from the first opposing surface 20A in this way, it is possible to prevent the adhesive from spreading to the periphery of the bolt hole 36 when assembling the pillar lower portion 20 and the rocker 12.

[0051] Furthermore, the adhesive step portions 40 are divided into multiple portions and arranged around the bolt step portion 38 with gaps between them. This allows the adhesive to enter the gaps between adjacent adhesive step portions 40, preventing the adhesive from spreading to unintended areas, and maintaining a good fastening state between the pillar lower portion 20 and the rocker 12.

[0052] In particular, in this embodiment, the pillar lower section 20 is fastened to the rocker 12 on two surfaces, the first opposing surface 20A and the second opposing surface 20B, so the pillar lower section 20 can be attached in the vehicle width direction and the vehicle up-down direction. In addition, the first opposing surface 20A is provided with the bolt step 38 and the adhesive step 40, so the first opposing surface 20A can be fixed with the bolt 100 and adhesive.

[0053] Furthermore, the second opposing surface 20A is also provided with a bolt step 44 and an adhesive step 42, so that both the first opposing surface 20A and the second opposing surface 20B can be fixed with bolts and adhesive.

[0054] Furthermore, in this embodiment, adjacent bolt holes 36 are formed in staggered positions so that they are offset in the vertical direction of the vehicle, so that the fastening state can be maintained well against external forces input in both the vertical direction and the longitudinal direction of the vehicle, compared to when the bolt holes 36 are arranged in a straight line.

[0055] Furthermore, in this embodiment, the front module 18 including the pillar lower section 20 is a vehicle frame member formed by die-casting, which makes it difficult to join by welding or the like. However, even such a vehicle frame member can be firmly fixed to a fastened member using bolts and adhesive. In this way, the vehicle fastening structure according to this embodiment, which combines mechanical fastening using bolts and joining using adhesive, can maintain a good fastened state.

[0056] Although the vehicle fastening structure according to the embodiment has been described above, it is needless to say that it can be embodied in various forms without departing from the spirit and scope of the present invention. For example, in the above embodiment, four bolt holes 36 are formed in the first opposing surface 20A, but the number of bolt holes 36 is not limited to this.

[0057] In the above embodiment, the first opposing surface 20A is provided with six divided adhesive step portions 40, but this is not limited thereto. For example, the number of adhesive step portions 40 may be five or less, or seven or more. Furthermore, in the above embodiment, the second opposing surface 20A is provided with two bolt step portions 44 and five adhesive step portions 42, but this is not limited thereto, and the number of bolt step portions 44 and adhesive step portions 42 may be changed as appropriate. Furthermore, a configuration may be provided in which only adhesive step portions 42 are provided without providing bolt step portions 44.

[0058] Furthermore, in the above embodiment, the shapes of the bolt step portions 38, 40 and the adhesive step portions 40, 42 are not particularly limited and may be other shapes. Furthermore, in the above embodiment, the fastening target member is the pillar lower portion 20 of the front module 18, but this is not limited thereto and the fastening target member may be applied to other portions. For example, the fastened member may be a vehicle frame member that constitutes the rear portion of the vehicle. In this case, the present invention is applied to the fastening structure between the rear end portion of the rocker and the rear module.

[0059] The following notes are provided regarding the above embodiment.

[0060] (Appendix 1) a bolt hole that opens in a surface of the fastening target member that faces the fastened member and into which a bolt can be screwed; a bolt step portion that protrudes from the opposing surface toward the fastened member, surrounds the edge of the bolt hole, and comes into contact with the fastened member; an adhesive step portion on which an adhesive is placed, the adhesive step portion protruding from the opposing surface toward the fastened member; and The adhesive step portion is divided into a plurality of portions and arranged around the bolt step portion with gaps between them. Vehicle fastening structure. (Appendix 2) The vehicle fastening structure described in Appendix 1, wherein the opposing surfaces include a first opposing surface that faces the fastened member in the vehicle width direction and a second opposing surface that faces the fastened member in the vehicle vertical direction. (Appendix 3) The first opposing surface is provided with the bolt step portion and the adhesive step portion, 3. The vehicle fastening structure according to claim 2, wherein at least the adhesive step portion is provided on the second opposing surface. (Appendix 4) The vehicle fastening structure described in any one of Appendix 1 to Appendix 3, wherein the bolt holes are formed in multiple positions along the vehicle longitudinal direction, and adjacent bolt holes are formed in staggered positions so as to be offset from each other in the vehicle vertical direction. (Appendix 5) 5. The vehicle fastening structure according to any one of appendices 1 to 4, wherein the fastening target member is a vehicle frame member formed by die casting and constituting a vehicle frame. [Explanation of symbols]

[0061] 12 Rocker (fastened member) 18 Front module (fastening target components, vehicle frame components) 20A First opposing surface 20B 2nd facing surface 36 bolt holes 38, 44 Stepped section for bolts 40, 42 Stepped portion for adhesive 100 volts

Claims

1. a bolt hole that opens in a surface of the fastening target member that faces the fastened member and into which a bolt can be screwed; a bolt step portion that protrudes from the opposing surface toward the fastened member, surrounds the edge of the bolt hole, and comes into contact with the fastened member; an adhesive step portion on which an adhesive is placed, the adhesive step portion protruding from the opposing surface toward the fastened member; and The adhesive step portion is divided into a plurality of portions and arranged around the bolt step portion with gaps between them. Vehicle fastening structure.

2. 2. The vehicle fastening structure according to claim 1, wherein the opposing surfaces include a first opposing surface that faces the fastened member in the vehicle width direction, and a second opposing surface that faces the fastened member in the vehicle vertical direction.

3. The first opposing surface is provided with the bolt step portion and the adhesive step portion, The vehicle fastening structure according to claim 2 , wherein at least the adhesive step portion is provided on the second opposing surface.

4. 2. The vehicle fastening structure according to claim 1, wherein the bolt holes are formed in a plurality of positions along the longitudinal direction of the vehicle, and adjacent bolt holes are formed in staggered positions so as to be offset from each other in the vertical direction of the vehicle.

5. 5. The vehicle fastening structure according to claim 1, wherein the fastening target member is a vehicle frame member formed by die casting and constituting a vehicle frame.

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