sealing structure

Abstract

It can suppress the delamination of liquid sealants. [Solution] The seal structure seals the space between a first seal portion on the first surface of a first component and a second seal portion on the second surface of a second component. A liquid sealant that hardens at room temperature is placed between the first seal portion and the second seal portion. Groove-shaped first liquid reservoirs are formed on both sides of the first seal portion, extending parallel to the first seal portion. Groove-shaped second liquid reservoirs are formed on both sides of the second seal portion, facing the first liquid reservoirs, and extending parallel to the second seal portion.

Description

Technical Field

[0001] The present disclosure relates to a sealing structure for sealing between a first surface of a first component and a second surface of a second component.

Background Art

[0002] A sealing structure is known in which a liquid sealant is disposed between a first surface of a first component and a second surface of a second component to seal therebetween (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above sealing structure, for example, due to vibration or the like, the liquid sealant may be extruded outward before curing, resulting in a risk of seal failure.

[0005] The present disclosure has been made in view of such problems, and a main object thereof is to provide a sealing structure capable of suppressing seal failure of a liquid sealant.

Means for Solving the Problems

[0006] One aspect of the present invention for achieving the above object is a sealing structure for sealing between a first seal portion on a first surface of a first component and a second seal portion on a second surface of a second component, wherein a liquid sealant that cures at room temperature is disposed between the first seal portion and the second seal portion, groove-shaped first liquid reservoirs extending parallel to the first seal portion are formed on both sides of the first seal portion, On both sides of the second sealing portion, and facing the first liquid reservoir, groove-shaped second liquid reservoirs are formed that extend parallel to the second sealing portion. sealing structure That is the case. On this flight, The liquid sealant may be a moisture-curing FiPG (Formed In Place Gasket). On this flight, The first component may be a die-cast component, and the second component may be a rocker component. On this flight, Multiple first sealing portions and first liquid reservoirs on both sides of the first sealing portion are formed on the first surface of the first component. Multiple second sealing portions and second liquid reservoirs on both sides of the second sealing portion may be formed on the second surface of the second component. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a sealing structure that can suppress the failure of liquid sealants. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a schematic configuration of the seal structure according to this embodiment. [Figure 2] This figure shows the state in which vibration is input to the seal structure and the sealant between the first seal portion 4 and the second seal portion is compressed. [Figure 3] This figure shows the state in which vibration is input to the seal structure, causing the sealant in the first seal portion and the sealant between the seal portions to expand. [Figure 4] This figure shows an example of the shapes of the first and second parts according to this embodiment. [Figure 5] This figure shows an experiment to verify the effects of the seal structure according to this embodiment. [Figure 6] This figure shows an example of a configuration in which multiple first and second sealing portions and first and second liquid reservoirs are formed. [Modes for carrying out the invention]

[0009] This embodiment will be described below with reference to the drawings. Figure 1 is a diagram showing the schematic configuration of the seal structure according to this embodiment. The seal structure 1 according to this embodiment seals the space between the first seal portion 4 on the first surface 3 of the first part 2 and the second seal portion 7 on the second surface 6 of the second part 5. For example, the first part 2 is a die-cast part, and the second part 5 is a rocker part of a vehicle. Note that a die-cast part is a part that is molded by die-casting.

[0010] A liquid sealant 8 that hardens at room temperature is placed between the first seal portion 4 and the second seal portion 7. The liquid sealant 8 is, for example, a humidity-curing FiPG (Formed In Place Gasket).

[0011] In conventional body structures (monocoque), the body shell is formed first, and then the components are mounted onto that body shell. For this reason, thermosetting sealants were used. On the other hand, in the new body structure, each module is completed and assembled separately.

[0012] For this reason, the liquid sealant 8 used is a room-temperature curing type, as described above. This type of sealant 8 has a long curing time, and it is required to maintain seal quality in an uncured state throughout multiple processes.

[0013] Furthermore, for example, vibration input to the first part 2 and the second part 5 can cause pumping between the first part 2 and the second part 5. This pumping can push the sealant 8 filled between the first seal part 4 and the second seal part 7 outwards, which conventionally could cause seal failure, leading to air entrapment and seal defects.

[0014] In contrast, in the seal structure 1 according to the present embodiment, on both sides of the first seal portion 4, groove-shaped first liquid reservoirs 9 extending parallel to the first seal portion 4 are formed. Further, on both sides of the second seal portion 7 and facing the first liquid reservoirs 9, groove-shaped second liquid reservoirs 10 extending parallel to the second seal portion 7 are formed.

[0015] Thereby, it is possible to suppress the phenomenon in which the sealant 8 is extruded from between the first seal portion 4 and the second seal portion 7 due to the pumping phenomenon as described above. Therefore, the problem of seal breakage with respect to the vibration input as described above can be solved.

[0016] For example, when assuming that the width W of the first seal portion 4 and the second seal portion 7 is 3 mm and the distance (initial thickness) h0 between the first surface 3 of the first component 2 and the second surface 6 of the second component 5 is 2 to 4 mm, depending on the seal structure 1 and the magnitude of the input vibration, the depth h of the first liquid reservoirs 9 and the second liquid reservoirs 10 may be about 6 mm.

[0017] Further, as described above, if the first liquid reservoirs 9 and the second liquid reservoirs 10 are in an inverse phase relationship at the same position, the counterboring amount of the first liquid reservoirs 9 and the second liquid reservoirs 10 may be adjusted to 1 to 2 mm.

[0018] Note that, among the first liquid reservoirs 9 and the second liquid reservoirs 10, counterboring may be provided only in one of them, but the suppression effect is greater when counterboring is evenly provided in both of them in a balanced manner. Therefore, it is more preferable to provide counterboring evenly in both the first liquid reservoirs 9 and the second liquid reservoirs 10.

[0019] Subsequently, the operation when vibration is input to the seal structure 1 according to the present embodiment will be described with reference to FIGS. 2 and 3. In the following description, it is assumed that counterboring is provided in both the first liquid reservoirs 9 and the second liquid reservoirs 10.

[0020] When vibration is input to the seal structure 1, the sealant 8 between the first seal portion 4 and the second seal portion 7 will repeatedly alternate between a compressed state and an expanded state.

[0021] Figure 2 shows the state in which vibration is applied to the seal structure and the sealant between the first seal portion and the second seal portion is compressed. Figure 3 shows the state in which vibration is applied to the seal structure and the sealant between the first seal portion 4 and the second seal portion is expanded.

[0022] As shown in Figure 2, when the sealant 8 is compressed, the distance between the first sealing portion 4 and the second sealing portion 7 decreases. As a result, the sealant 8 between the first sealing portion 4 and the second sealing portion 7 is pushed outwards.

[0023] The sealant 8 that is pushed outwards is trapped in the first liquid reservoir 9 and the second liquid reservoir 10. As a result, the sealant 8 between the first sealing portion 4 and the second sealing portion 7 is less likely to spread outwards.

[0024] In this way, when the sealant 8 is compressed, the first liquid reservoir 9 and the second liquid reservoir 10 can prevent the sealant 8 from separating from the first sealing portion 4 and the second sealing portion 7.

[0025] On the other hand, as shown in Figure 3, when the sealant 8 expands, the distance between the first sealing portion 4 and the second sealing portion 7 increases. As a result, there is insufficient sealant 8 between the first sealing portion 4 and the second sealing portion 7. Therefore, the sealant 8 in the first liquid reservoir 9 and the second liquid reservoir 10 outside the first sealing portion 4 and the second sealing portion 7 is drawn between the first sealing portion 4 and the second sealing portion 7 by surface tension.

[0026] Thus, the first liquid reservoir 9 and the second liquid reservoir 10 have the role of supplying the sealant 8 when the sealant 8 expands. This makes it possible to suppress sealing defects caused by air being trapped between the first seal portion 4 and the second seal portion 7 due to the inability to supply the sealant 8.

[0027] Figure 4 shows an example of the shapes of the first and second parts according to this embodiment. The first part 2 is a die-cast part and has the characteristic of being easily molded if it has a simple shape. The second part 5 is a rocker part, and is shown as an example of a part molded from an extruded material.

[0028] For example, as shown in Figure 4, the width of the first seal portion 4 and the second seal portion 7 is 3 mm, and the opening width of the first liquid reservoir portion 9 and the second liquid reservoir portion 10 on both sides is 2 mm. The depth of the grooves of the first liquid reservoir portion 9 and the second liquid reservoir portion 10 is 1 to 2 mm. The draft angle of the first liquid reservoir portion 9 is 3 to 5 degrees, and the draft angle of the second liquid reservoir portion 10 is 0 to 5 degrees.

[0029] Next, we will explain the experiment conducted to verify the effects described above. In this experiment, as shown in the upper diagram of Figure 5, we compared (a) the case in which the sealant 8 is placed between a pair of planes and vibration is applied, and (b) the case in which the sealant 8 is placed between a plane and a rib and vibration is applied.

[0030] In this comparison, we used a graph with the initial thickness (mm) on the vertical axis and the vibration amplitude pp (mm) on the horizontal axis to confirm the difference in the OK region where no sealing defects occur for cases (a) and (b) above.

[0031] As shown in the lower graph of Figure 5, it can be confirmed that in case (b), the OK area is larger compared to case (a).

[0032] This is because the sealing area (S>S) is greater in case (b) than in case (a). l This is because, as the size of the sealant decreases, the force pushing the sealant 8 outwards during compression decreases, making it easier for the sealant 8 to remain in the seal area. Since the extruded sealant 8 also remains near the seal area, it can be easily supplied to the seal area during expansion.

[0033] Therefore, it can be seen that even in case (a), the same effect as in case (b) can be expected by providing liquid reservoirs on both sides of the sealing portion.

[0034] Furthermore, in the above embodiment, assembly variations such as misalignment of the first part 2 and the second part 5 and the application position of the sealant 8 may be taken into consideration. In this case, as long as the width of the first and second sealing portions 4 and 7 can be secured, as shown in Figure 6, a first sealing portion 22 and a plurality of first liquid reservoirs 23 on both sides of the first sealing portion 22 may be formed on the first surface 21 of the first part 20, and a second sealing portion 26 and a plurality of second liquid reservoirs 27 on both sides of the second sealing portion 26 may be formed on the second surface 25 of the second part 24.

[0035] In this way, by forming multiple first and second sealing portions 22, 26 and first and second liquid reservoir portions 23, 27, robustness of the seal between the first and second sealing portions 22, 26 can be ensured.

[0036] While several embodiments of this disclosure have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0037] 1. Seal structure 2. Part 1 3 Front page 4. First seal section 5. Part 2 6 Side 2 7. Second seal section 8. Sealant 9. First liquid reservoir section 10 Second liquid reservoir 20 Part 1 21 Page 1 22 First seal section 23. First liquid reservoir section 24 Part 2 25 Side 2 26 Second seal section 27 Second liquid reservoir

Claims

1. A sealing structure that seals the space between a first sealing portion on the first surface of a first component and a second sealing portion on the second surface of a second component, A liquid sealant that hardens at room temperature is placed between the first sealing portion and the second sealing portion. A groove-shaped first liquid reservoir is formed on both sides of the first seal portion, extending parallel to the first seal portion. On both sides of the second sealing portion, and facing the first liquid reservoir, groove-shaped second liquid reservoirs are formed that extend parallel to the second sealing portion. Seal structure.

2. The seal structure according to claim 1, The aforementioned liquid sealant is a moisture-curing FiPG (Formed In Place Gasket). Seal structure.

3. The seal structure according to claim 1, The first part is a die-cast part, and the second part is a rocker part. Seal structure.

4. The seal structure according to claim 1, Multiple first sealing portions and first liquid reservoirs on both sides of the first sealing portion are formed on the first surface of the first component. On the second surface of the second component, a plurality of the second sealing portion and the second liquid reservoir portions on both sides of the second sealing portion are formed. Seal structure.

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