Fastening method and fastening device

Abstract

To improve rigidity and sealing performance of a body component of a vehicle while reducing the number of parts.SOLUTION: The fastening method includes a step of measuring dimensions of the rocker 21, a step of measuring dimensions of the cast 22, a step of selecting the shim 24 to be assembled to the rocker 21, a step of assembling the shim 24 to the rocker 21, a step of assembling the rocker 21 and the cast 22, and a step of fastening the rocker 21 and the shim 24. The method includes a step of fastening the rocker 21 and the cast 22 to each other, and a step of injecting an adhesive between the rocker 21 and the cast 22, and in the step of selecting the shim 24, the shim 24 having a predetermined shim thickness t is selected according to the distance of the gap S when the rocker 21 and the cast 22 are assembled, and the distance of the adjusted gap W from the shim 24 to the cast 22 is adjusted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a method and device for fastening a vehicle body. [Background technology]

[0002] BACKGROUND ART In recent years, vehicle components formed by joining a first module base and a second module base are used in the vehicle manufacturing process.

[0003] Patent document 1 describes a joining method that can join two partial modules with high precision even when the two partial modules are manufactured separately and there is variation in the angle and front-to-back position of the left and right joining surfaces of each partial module. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-023036 Summary of the Invention [Problem to be solved by the invention]

[0005] For vehicle component modules, a rocker is joined in a square shape for purposes such as battery protection, and then multiple casts are fastened together with assembly bolts. However, due to issues with the machining precision of the parts, there is a large gap between the rocker and the cast, which can cause stress to be generated between the rocker and the cast when the bolts are fastened. Furthermore, if this stress exceeds the allowable stress, damage to these modules is likely to occur.

[0006] Furthermore, when bolting, adhesive is applied to the bolt fastening surface to ensure strength, and then the cast is attached to the rocker. At this time, the minimum precision or lateral movement of these parts can cause the gap to become small or almost nonexistent, scraping off the adhesive and making it impossible to ensure the desired strength.

[0007] The present disclosure provides a fastening method and a fastening device that improves the rigidity and sealing performance of vehicle body components while reducing the number of parts. [Means for solving the problem]

[0008] The fastening method disclosed herein is a fastening method for a vehicle body structure formed by combining a rocker and a cast, and includes the steps of measuring the dimensions of the rocker, measuring the dimensions of the cast, selecting a shim to be assembled to the rocker, assembling the shim to the rocker, assembling the rocker and the cast, fastening the rocker and the shim with bolts and fastening the rocker and the cast with bolts, and injecting adhesive between the rocker and the cast, and the step of selecting the shim involves selecting a shim having a predetermined shim thickness depending on the gap distance when assembling the rocker and the cast, and adjusting the adjusted gap distance from the shim to the cast. This allows the gap between the locker and the cast to be adjusted using a shim.

[0009] In addition, the fastening device according to the present disclosure is a fastening device for a vehicle body structure formed by combining a rocker and a cast, and includes a rocker dimension measuring unit that measures the dimensions of the rocker, a cast dimension measuring unit that measures the dimensions of the cast, a shim selection unit that selects a shim to be assembled to the rocker, a shim assembly unit that assembles the shim to the rocker, a rocker cast assembly unit that assembles the rocker and the cast, a bolt fastening unit that fastens the rocker and the shim with bolts and also fastens the rocker and the cast with bolts, and an adhesive injection unit that injects adhesive between the rocker and the cast, and the shim selection unit selects the shim having a predetermined shim thickness according to the distance of the gap when assembling the rocker and the cast, and adjusts the distance of the adjusted gap from the shim to the cast. This allows the gap between the locker and the cast to be adjusted using a shim. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a fastening method and a fastening device that improves the rigidity and sealing performance of vehicle body components while reducing the number of parts. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram showing a configuration block and an operation flow of a fastening device according to a first embodiment. FIG. [Figure 2] FIG. 1 shows an object to be fastened by a related fastening device. [Figure 3] 1 is a diagram showing an object to be fastened by the fastening device according to the first embodiment; [Figure 4] 10 is a graph showing an example of an adjusted gap W adjusted to within a predetermined range by setting a shim thickness t according to an initial gap S according to the first embodiment. [Figure 5] FIG. 2 is a perspective view showing an example of adhesive injection according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing details of adhesive injection according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Embodiment 1 A fastening device 1 for a vehicle body according to this embodiment will be described below with reference to the drawings. Fig. 1(a) shows the configuration of the fastening device 1, and Fig. 1(b) is a diagram showing an example of the operation flow of the fastening device 1.

[0013] 1, the fastening device 1 includes a rocker dimension measuring section 11, a cast dimension measuring section 12, a shim selecting section 13, a shim assembling section 14, a rocker cast assembling section 15, a bolt fastening section 16, and an adhesive injection section 17. The objects to be fastened will be described as a rocker 21, a first cast (Fr cast) 22, a second cast (Rr cast) 23, and a shim 24.

[0014] 2(a), when viewed from a specific direction, the direction in which one of the two opposing sides of the locker 21 extends is the X direction, and the direction in which the other two opposing sides extend is the Y direction, and the X and Y directions are perpendicular to each other. Furthermore, the direction perpendicular to the X and Y directions is the Z direction, and the Z direction may be described as the up-down direction.

[0015] The rocker dimension measuring unit 11 measures the dimensions of the rocker 21. As shown in Figures 2(a) to 2(c) and 3(a) and 3(c), the rocker 21 is a component configured in a square shape. Note that Figure 2 shows a related vehicle component that is assembled without using a shim 24, while Figure 3 shows a component according to the present disclosure that is assembled using a shim 24. Note that the rocker dimension measuring unit 11 measures the rocker dimension Wr.

[0016] The cast dimension measuring unit 12 measures the dimensions of the Fr cast 22 and the Rr cast 23. Here, Figures 2(b) and 3(a) are perspective views showing the state in which the Fr cast 22 and the Rr cast 23 are attached to the locker 21. The cast dimension measuring unit 12 measures the cast dimension Wc. Here, it is particularly assumed that the Fr cast 22 and the Rr cast 23 are attached to the locker 21 in that order, and the dimension of the cast attached to the locker 21 is referred to as the cast dimension Wc. In the following, for simplicity of explanation, the Fr cast 22 may be attached, but the same applies to the Rr cast 23.

[0017] Note that Figure 2(b) is an example of a state in which shims 24 are not sandwiched between the rocker 21 and the Fr cast 22, and between the rocker 21 and the Rr cast 23, while Figure 3(a) shows a state in which shims 24 are sandwiched between the rocker 21 and the Fr cast 22, and between the rocker 21 and the Rr cast 23.

[0018] The shim selection unit 13 calculates the initial gap S before adjustment, which is the gap between the rocker 21 and the Fr cast 22, based on the rocker dimension Wr measured by the rocker dimension measurement unit 11 and the cast dimension Wc measured by the cast dimension measurement unit 12, and also calculates the gap W after adjustment, thereby selecting a shim 24 having the optimal shim thickness t.

[0019] In the arrangement of Fig. 2(b), the locker dimension Wr is the width of the locker 21 in the Y direction at the position where the cast 22 is attached, and the cast dimension Wc is the width of the cast 22 in the Y direction at the position where the locker 21 is attached. Fig. 2(c) is an enlarged view of the location where the locker 21 and the cast 22 are assembled, i.e., the vicinity of the ends of the locker 21 and the cast 22 in the Y direction.

[0020] Here, the fastening device 1 shall calculate the initial gap S by Wr - Wc. Also, the fastening device 1 shall calculate the adjusted gap W by W = (Wr - Wc) - t. In other words, the adjusted gap W = the initial gap S - the shim thickness t.

[0021] Here, FIG. 3(c) is a top view showing an example of the initial gap S and the adjusted gap W of the Fr cast 22 attached to the rocker 21. That is, FIG. 3(c) is an enlarged view of the vicinity of the end in the Y direction when the rocker 21 and the cast 22 are attached as shown in FIG. 3(a).

[0022] As shown in FIGS. 4(a) and 4(b), the shim selection unit 13 selects a shim 24 with a predetermined shim thickness t such that C < W < A, B in the relationship of the adjusted gap W with the upper limit A set from the stress applied to the rocker 21 and the cast 22, the upper limit B set from the allowable value of the adhesive outflow, and the lower limit C set from the air bleeding condition during adhesive injection. FIGS. 4(a) and 4(b) will be described later.

[0023] Note that FIG. 3(b) is an example of the selected shim 24, and it has a flat plate surface 24a, a bolt insertion part 24b through which a bolt can be inserted into the flat plate surface 24a to fix the rocker 21 and the shim 24, and a hole-shaped injection hole 24c into which the adhesive can be injected.

[0024] The shim assembly part 14 is, for example, an assembly part that moves the shim 24 to the attachment position on the rocker 21. Note that the shim 24 may be attached to the cast 22 instead of the rocker 21. In that case, the shim assembly part 14 moves the shim 24 to the attachment position on the cast 22. Hereinafter, the shim 24 will be described as being attached to the rocker 21.

[0025] The rocker - cast assembly part 15 is, for example, an assembly part that moves the rocker 21 and the cast 22 to a position where they can be assembled.

[0026] The bolt fastening portion 16 is a fastening portion that fastens the rocker 21 and the shim 24 with a bolt. The bolt fastening portion 16 also fastens the rocker 21 and the cast 22 with a bolt.

[0027] The adhesive injection section 17 is a fastening section between the rocker 21 and the cast 22, and is a filling device that injects adhesive into the gap adjusted by the shim 24.

[0028] The operation of the fastening device 1 will be described below with reference to FIG.

[0029] The locker dimension measuring unit 11 measures the dimensions of the locker 21 (step S1). Next, the cast dimension measuring unit 12 measures the dimensions of the cast 22 (step S2).

[0030] Next, the shim selection unit 13 selects the shim thickness for the shim 24 to be used (step S3).

[0031] 4(a) is a diagram showing the size of the initial gap S, a state in which a shim 24 having a shim thickness appropriate for the initial gap S is used from among a plurality of shims 24, and the adjusted gap W calculated by using the shim 24. Here, it is assumed that one shim 24 is selected from a plurality of shims 24 having five different shim thicknesses.

[0032] Furthermore, Figure 4(b) is an enlarged view of the adjusted gap W, showing the state in which two upper limits, upper limit A and upper limit B, and lower limit C, have been set. Here, upper limit A is the length of the gap at which the stress generated in the rocker 21 and the cast 22 when the bolt is tightened is below the allowable value. Upper limit B is the length of the gap at which the outflow of adhesive from between the rocker 21 and the cast 22 when the adhesive is injected is below the allowable value. Lower limit C is the length of the gap at which air can be easily released from between the rocker 21 and the cast 22 when the adhesive is injected.

[0033] In FIG. 4(b), upper limit A is greater than upper limit B, but upper limit B may be greater than upper limit A. Typically, the smaller of upper limits A and B is used.

[0034] In this way, the shim selector 13 selects a shim 24 having an appropriate shim thickness from the multiple shims so that the adjusted gap W is greater than the lower limit C and smaller than the upper limits A and B. As described above, the adjusted gap W is a value calculated by the formula: adjusted gap W = initial gap S - shim thickness t.

[0035] In summary, the shim selection unit 13 can select a shim 24 having a shim thickness t so that the adjusted gap W is a distance that ensures the amount of adhesive injected after the bolt is tightened. Specifically, the shim selection unit 13 can set a lower limit C to limit the length of the adjusted gap W so that the gap allows air to escape between the rocker 21 and the cast 22, and can set an upper limit B to limit the adhesive outflow when the adhesive is injected to a predetermined allowable value or less. The shim selection unit 13 can also set an upper limit A depending on the stress applied to the rocker 21 and the cast 22. Furthermore, the shim selection unit 13 can select a shim 24 having a shim thickness t to be used so that the adjusted gap W satisfies the conditions of these limits A to C.

[0036] Next, the shim assembly unit 14 assembles the rocker 21 with the selected shim 24 (step S4). Next, the rocker cast assembly unit 15 assembles the rocker 21 with the cast 22 (step S5). Next, the bolt fastening unit 16 fastens the shim 24 to the rocker 21 with bolts, and fastens the rocker 21 to the cast 22 with bolts (step S6).

[0037] Next, the adhesive injector 17 injects adhesive into the gap, which is the fastening portion between the rocker 21 and the cast 22 and has been adjusted by the shim 24 (step S7).

[0038] 3(b), shim 24 has injection hole 24c, and the area of ​​injection hole 24c on the surface of shim 24 is defined as area V. Using area V and initial gap S, the injection amount of adhesive is determined as a target filling amount = V × S.

[0039] Figures 5(a) to 5(d) are diagrams showing examples of states in which adhesive is injected into injection hole 24c. Figure 5(a) shows the start of injection, Figure 5(b) shows the early stage of injection, Figure 5(c) shows the later stage of injection, and Figure 5(d) shows the state when injection is complete.

[0040] As shown by the arrows in Figure 5(b), when adhesive is injected from the adhesive injection section 17 into the injection hole 24c between the rocker 21 and the cast 22, air escapes from the minute gaps at locations other than the bolt insertion section 24b. On the other hand, as shown by the arrows in Figure 5(d), as the amount of adhesive injected into the injection hole 24c by the adhesive injection section 17 increases, the adhesive itself begins to leak out of the minute gaps. Therefore, the fastening device 1 adjusts the injection of the adhesive to an appropriate filling amount using the target filling amount V x S and the allowable leakage value Q, etc.

[0041] Specifically, Fig. 6 is a graph showing an example of the configuration of adhesive injection unit 17 and the conditions for injecting the adhesive. Specifically, Fig. 6(a) shows an example of the configuration of adhesive injection unit 17, and Fig. 6(b) shows an enlarged view of the shim 24 and the vicinity of injection hole 24c. In Fig. 6(c), the horizontal axis represents the amount of adhesive injected or time, and the vertical axis represents the power of drive motor 31 (described later) or the magnitude of pressure applied to the adhesive in injection cylinder 32.

[0042] 6(a), adhesive injection section 17 has a drive motor 31, an injection cylinder 32, a nozzle 33, and a pressure gauge 34. Injection cylinder 32 is operated by the driving force received from drive motor 31, and the adhesive filled therein is injected via nozzle 33 into injection hole 24c of shim 24 disposed at the fastening portion between rocker 21 and cast 22. Note that pressure gauge 34 can measure the pressure applied to the adhesive within injection cylinder 32 or nozzle 33.

[0043] As shown in FIG. 6(b), the distance between the surface of the shim 24 facing the cast 22 and the cast 22 is the adjusted gap W. Here, as shown in FIG. 6(c), if the adjusted gap W is too small (gap 4), the air from the injected adhesive will not escape properly, causing pressure to rise before filling, and making it impossible to inject the desired amount of adhesive. In this case, by appropriately setting the lower limit C in FIG. 4(b) so that the adjusted gap W exceeds the lower limit C, the gap between the rocker 21 and the cast 22 can be made into a gap that allows air to escape properly.

[0044] Furthermore, if the adjusted gap W is too large (gap 1 in Figure 6(c)), even after injection is complete, a large amount of adhesive will leak out of the gap, preventing the pressure from rising above the predetermined threshold P, which is an undesirable condition. In this case, by appropriately setting the upper limit B in Figure 4(b) so that the adjusted gap W does not exceed the upper limit B, the gap between the rocker 21 and the cast 22 can be made to be a gap in which adhesive leakage is below the allowable value.

[0045] Therefore, in the adhesive injection section 17, when the adjusted gap W is set appropriately (gap 2 and gap 3 in Figure 6(c)), the outflow of adhesive from the gap can be kept within the allowable value Q, and injection can be completed when the pressure on the adhesive exceeds a predetermined threshold value P.

[0046] 6(a), the adhesive injection section 17 is provided on the locker 21 side, and the nozzle 33 is shown as being arranged through a nozzle through-hole provided in the locker 21, but this is not limiting. In other words, the adhesive injection section 17 may be configured to be provided on the cast 22 side.

[0047] From the above, the fastening device 1 can provide a shim 24 having an appropriate shim thickness t between the rocker 21 and the cast 22. In other words, the fastening device 1 determines to use a shim 24 having a predetermined shim thickness t depending on the length of the gap S that occurs between the rocker 21 and the cast 22 when the shim 24 is not sandwiched. This allows the fastening device 1 to adjust the distance between the shim 24 attached to the rocker 21 and the cast 22, and the adjusted gap W becomes a gap that guarantees the amount of adhesive to be injected.

[0048] Therefore, in the fastening device 1, when adhesive is injected between the rocker 21 and the cast 22, particularly toward the injection hole 24c provided in the shim 24, a sufficient amount of adhesive can be injected so that the bond between the rocker 21 and the cast 22 is sufficiently strong while suppressing the amount of adhesive that leaks out from the gap between the shim 24 and the cast 22.

[0049] This makes it possible to improve the rigidity and sealing performance of the vehicle body components while reducing the number of parts.

[0050] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the sake of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0051] For example, as described above, the shim 24 may be attached to the cast 22 instead of being attached to the rocker 21. That is, the fastening method includes the steps of selecting the shim 24 to be assembled to the cast 22, assembling the shim 24 to the cast 22, assembling the rocker 21 and the cast 22, fastening the cast 22 and the shim 24 with bolts and fastening the rocker 21 and the cast 22 with bolts, and injecting adhesive between the rocker 21 and the cast 22. In this way, the shim 24 having the shim thickness t can be selected according to the distance of the initial gap S when assembling the rocker 21 and the cast 22, and the distance of the adjusted gap W from the shim 24 to the rocker 21 can be adjusted. [Explanation of symbols]

[0052] 1 Fastening device 11 Locker dimension measurement section 12 Cast dimension measurement section 13 SIM selection section 14 Shim assembly section 15 Rocker cast assembly section 16 Bolt fastening part 17 Adhesive injection section 21 Locker 22 First Cast (Fr Cast) 23 Second Cast (Rr Cast) 24 Sim 24a flat plate surface 24b Bolt insertion part 24c injection hole 31 Drive motor 32 Injection cylinder 33 nozzle 34 Pressure gauge Q tolerance S initial gap V area W Adjusted gap Wc cast dimensions Wr locker dimensions t Shim thickness

Claims

1. A method for fastening a body structure of a vehicle body formed by combining a rocker and a cast, measuring the dimensions of the rocker; measuring the dimensions of the cast; selecting a shim to be assembled to the rocker; Assembling the shim to the rocker; Assembling the rocker and the cast; fastening the rocker and the shim together with bolts and fastening the rocker and the cast together with bolts; and injecting an adhesive between the rocker and the cast; The step of selecting a shim comprises: According to the distance of the gap when assembling the rocker and the cast, the shim having a predetermined shim thickness is selected, and the distance of the adjusted gap from the shim to the cast is adjusted. Fastening method.

2. Instead of assembling the shim to the rocker, the shim is assembled to the cast, selecting a shim to be assembled to the cast; Assembling the shim to the cast; Assembling the rocker and the cast; fastening the cast and the shim with bolts and fastening the rocker and the cast with bolts; and injecting an adhesive between the rocker and the cast; According to the distance of the gap when assembling the rocker and the cast, the shim having a predetermined shim thickness is selected, and the distance of the adjusted gap from the shim to the rocker is adjusted. The fastening method according to claim 1 .

3. The step of selecting a shim comprises: Selecting the shim having a shim thickness that ensures that the gap after adjustment is a distance that guarantees the amount of adhesive that will be injected after the bolt is tightened. The fastening method according to claim 2.

4. The step of selecting a shim comprises: The lower limit of the length of the adjusted gap is set so that the gap allows air to escape between the rocker and the cast, and the upper limit of the length of the adjusted gap is set so that the outflow of adhesive when the adhesive is injected is limited to a predetermined allowable value or less, and the shim having a shim thickness that satisfies both the lower limit and the upper limit is selected. The fastening method according to claim 3.

5. A fastening device for a body structure of a vehicle body formed by combining a rocker and a cast, a locker dimension measuring unit that measures the dimensions of the locker; a cast dimension measuring unit that measures the dimensions of the cast; a shim selection unit that selects a shim to be assembled to the rocker; a shim assembly section that assembles the shim to the rocker; a rocker cast assembly unit that assembles the rocker and the cast; a bolt fastening portion that fastens the rocker and the shim with a bolt and fastens the rocker and the cast with a bolt; an adhesive injection unit that injects adhesive between the rocker and the cast; The shim selection unit According to the distance of the gap when assembling the rocker and the cast, the shim having a predetermined shim thickness is selected, and the distance of the adjusted gap from the shim to the cast is adjusted. Fastening device.

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