Cable watertight structure

Abstract

To provide a water cut-off structure of a cable by which water cut-off performance with respect to a cable is well obtained and work for passing the cable through an insertion hole of a packing is easily performed and also mass productivity of the cable and the packing is not damaged.SOLUTION: A water cut-off structure of a cable comprises a packing 1 which has an insertion hole 1c through which a cable 4 is inserted, and a washer 2 which is attached to an object 3, compresses and deforms the packing 1 between an object 3 and itself and pushes the insertion hole 1c to an outer peripheral surface of the cable 4. The packing 1 has a long shape in which a length in a first direction along the object 3 is larger than a length in a second direction crossing with the first direction along the object 3. The insertion hole 1c has a long shape in which a bore in the first direction is larger than a bore in the second direction.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a water stop structure for a cable.

Background Art

[0002] For example, when connecting a cable to an object (such as an electric device) for transmitting an electric signal or supplying power, a water stop structure for preventing water from entering the object through the cable is provided at the end of the cable drawn out from the object.

[0003] As such a water stop structure for a cable, Patent Document 1 discloses a water stop structure including a waterproof packing (packing) and a fixture (washer), the waterproof packing being provided with a hole (insertion hole) through which an electric wire (cable) passes, and the fixture being attached to the waterproof packing so as to press the peripheral portion of the hole of the waterproof packing around the electric wire.

[0004] The conventionally used water stop structure for a cable is one that makes the inner peripheral surface of the insertion hole adhere closely to the outer peripheral surface of the cable by compressing and deforming the packing with a washer, and the cable is passed through the insertion hole before the packing is compressed and deformed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, if the inner diameter of the insertion hole in the packing is made larger than the outer diameter of the cable in order to facilitate the process of passing the cable through the hole, a gap may be created between the inner surface of the insertion hole and the outer surface of the cable even when the packing is compressed and deformed with a washer, potentially resulting in insufficient waterproofing performance. On the other hand, if the inner diameter of the insertion hole is made smaller than the outer diameter of the cable, it becomes difficult to pass the cable through the insertion hole in the packing. Furthermore, in mass production, there will be dimensional variations in the cable and packing, but if we try to achieve both waterproofing performance and ease of work as described above, the outer diameter of the cable and the inner diameter of the insertion hole must be strictly controlled, and it is expected that many will fall outside the allowable dimensional range, which presents difficulties in terms of mass production.

[0007] In view of these conventional problems, the present invention aims to provide a cable watertight structure that provides sufficient watertight performance for cables, allows for easy insertion of cables through the packing holes, and does not impair the mass production capabilities of cables and packings. [Means for solving the problem]

[0008] The present invention relates to a cable watertight structure for sealing the end of a cable pulled out from an object, comprising: a packing having a through-hole through which the cable is inserted; and a washer attached to the object, which compresses and deforms the packing between itself and the object, pressing the through-hole against the outer surface of the cable, wherein the packing has an elongated shape in which the length in a first direction along the object is greater than the length in a second direction along the object and intersecting the first direction, and the through-hole has an elongated shape in which the inner diameter in the first direction is greater than the inner diameter in the second direction. The packing comprises a base portion that is compressed and deformed between the object and the washer on one side of the object, and a convex portion that protrudes from the base portion and is inserted into an opening provided in the object, and protrudes through the opening to the other side of the object, the insertion hole passing through the base portion and the convex portion. .

[0010] Furthermore, the present invention relates to a cable watertight structure for sealing the end of a cable pulled out from an object, comprising: a packing having a through-hole through which the cable is inserted; and a washer attached to the object, which compresses and deforms the packing between itself and the object, pressing the through-hole against the outer surface of the cable, wherein the packing has an elongated shape in which the length in a first direction along the object is greater than the length in a second direction along the object and intersecting the first direction, the through-hole has an elongated shape in which the inner diameter in the first direction is greater than the inner diameter in the second direction, the packing comprises a base that compresses and deforms between the object and the washer, and a protrusion that protrudes from the base and is inserted into an opening provided in the object, and the through-hole penetrates the base and the protrusion. The insertion hole is composed of a first insertion hole that penetrates the base and a second insertion hole that penetrates the protrusion, the first insertion hole is an elongated hole in which the inner diameter in the first direction is larger than the inner diameter in the second direction, and the second insertion hole is a circular hole in which the inner diameter in the first direction and the inner diameter in the second direction are equal. ru.

[0011] Furthermore, the present invention relates to a cable watertight structure for sealing the end of a cable pulled out from an object, comprising: a packing having a through-hole through which the cable is inserted; and a washer attached to the object, which compresses and deforms the packing between itself and the object, pressing the through-hole against the outer surface of the cable, wherein the packing has an elongated shape in which the length in a first direction along the object is greater than the length in a second direction along the object and intersecting the first direction, the through-hole has an elongated shape in which the inner diameter in the first direction is greater than the inner diameter in the second direction, the packing comprises a base that compresses and deforms between the object and the washer, and a protrusion that protrudes from the base and is inserted into an opening provided in the object, and the through-hole penetrates the base and the protrusion. The through hole is composed of a first through hole penetrating the base and a second through hole penetrating the protrusion, the first through hole being elongated with an inner diameter in the first direction greater than the inner diameter in the second direction, the second through hole being elongated with an inner diameter in the first direction greater than the inner diameter in the second direction at the base of the protrusion, and circular with an inner diameter equal to the inner diameter in the first direction at the tip of the protrusion. ru. [Effects of the Invention]

[0012] According to the watertight sealing structure of the cable section of the present invention, sufficient watertight sealing performance for the cable can be obtained, the work of passing the cable through the insertion hole of the packing can be performed easily, and the mass production of the cable and packing is not impaired. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows a packing in relation to a cable watertight structure according to one embodiment of the present invention. [Figure 2] This figure shows a washer in relation to a cable watertight structure according to one embodiment of the present invention. [Figure 3] This figure shows a fixing plate related to a cable watertight structure according to one embodiment of the present invention. [Figure 4] This figure shows the state of the packing before it is compressed and deformed, relating to a cable water-stopping structure according to one embodiment of the present invention. [Figure 5] This figure shows the state after the packing has been compressed and deformed, relating to a cable water-stopping structure according to one embodiment of the present invention. [Figure 6] This figure shows a modified example of the packing shown in Figure 1. [Figure 7] This figure shows a further modified example of the packing shown in Figure 1. [Modes for carrying out the invention]

[0014] Hereinafter, a water stop structure of a cable according to an embodiment of the present invention will be described while referring to the accompanying drawings. In each of the accompanying drawings, the directions of X, Y, and Z are indicated to show the directional relationship between the drawings. Note that the drawings shown in the accompanying drawings are schematic, and the thickness, width, ratio between each part, etc. may be different from those actually implemented. For the sake of convenience, in the following description, the description will be made in the directions shown in the drawings, but the present invention is not limited to use only in the illustrated directions.

[0015] First, each member constituting the water stop structure of the cable according to the present embodiment will be described. The water stop structure of the cable of the present embodiment is composed of the packing 1 shown in FIG. 1 and the washer 2 shown in FIG. 2. The packing 1 and the washer 2 are applied to the fixing plate 3 (a structure used for an electric device and corresponding to the "object" in this specification) shown in FIG. 3. Further, the cable 4 shown in FIG. 4 is drawn out from the fixing plate 3.

[0016] In FIG. 1, (a) is a plan view of the packing 1, (b) is a cross-sectional view taken along A - A, and (c) is a cross-sectional view taken along B - B. The packing 1 of the present embodiment is formed of an elastic material (for example, silicone rubber) and can be compressed and deformed when pressure is applied.

[0017] As shown in FIG. 1(a), the packing 1 has a long shape in which the length in the first direction (the X direction shown in the present embodiment) in the horizontal plane is larger than the length in the second direction (in the present embodiment, the Y direction orthogonal to the X direction) intersecting in the same plane as the first direction, and in the present embodiment, it is a rounded rectangle (a shape surrounded by two straight lines of equal length and parallel and two semi-circles). Note that the long shape is not limited to the illustrated shape, and includes, for example, an oval shape, a rectangular shape, a shape with rounded corners of a rectangle, an egg shape, etc. Also, the above-described second direction only needs to intersect with the first direction (that is, not parallel to the first direction), and the packing 1 includes various shapes excluding a circular shape.

[0018] Also, as shown in FIGS. 1(b) and 1(c), the packing 1 of the present embodiment includes a base portion 1a that is a rounded rectangle as described above, and a convex portion 1b that is located at the center of the base portion 1a and protrudes from the lower surface of the base portion 1a. The shape of the convex portion 1b in plan view of the bottom surface is a long shape in which the length in the X direction is larger than the length in the Y direction, and is an ellipse in the present embodiment. Further, the convex portion 1b of the present embodiment is formed so as to have a reduced diameter from the base portion connected to the base portion 1a toward the tip portion.

[0019] And at the center of the packing 1, an insertion hole 1c is provided that penetrates the base portion 1a and the convex portion 1b in the vertical direction, and through which the above-described cable 4 is inserted. The shape of the insertion hole 1c in plan view is a long hole shape in which the inner diameter in the X direction is larger than the inner diameter in the Y direction, and is an ellipse in the present embodiment. Note that the long hole shape is not limited to the illustrated shape, and includes, for example, a rounded rectangle, a rectangle, a shape obtained by rounding the corners of a rectangle, an oval shape, and the like. The relationship between the inner diameter in the X direction, the inner diameter in the Y direction, and the outer diameter of the cable 4 will be described later. Here, the portion of the insertion hole 1c that penetrates the base portion 1a is referred to as a first insertion hole 1d, and the portion of the insertion hole 1c that penetrates the convex portion 1b is referred to as a second insertion hole 1e. The first insertion hole 1d and the second insertion hole 1e have the same shape in the present embodiment.

[0020] Also, the packing 1 includes two screw insertion holes 1f that penetrate the base portion 1a in the vertical direction at a position shifted in the X direction from the insertion hole 1c. The screw insertion hole 1f of the present embodiment is circular in plan view as shown in FIG. 1(a).

[0021] In FIG. 2, (a) is a plan view of the washer 2, (b) is a cross-sectional view taken along C-C, and (c) is a cross-sectional view taken along D-D. The washer 2 of the present embodiment is formed of a metal plate.

[0022] As shown in Figure 2(a), the washer 2 has a rounded rectangular top wall 2a whose length in the X direction is greater than its length in the Y direction. The top wall 2a is substantially the same shape as the base 1a of the packing 1 described above. At the center of the top wall 2a is a washer-side insertion hole 2b which is circular in plan view and penetrates the top wall 2a in the vertical direction. In this embodiment, the inner diameter of the washer-side insertion hole 2b is larger than the inner diameter in the X direction of the insertion hole 1c. Furthermore, the top wall 2a has two washer-side screw insertion holes 2c which are circular in plan view and penetrate the top wall 2a in the vertical direction, offset in the X direction from the washer-side insertion hole 2b.

[0023] The washer 2 also includes a peripheral wall 2d provided on the outer edge of the top wall 2a. A flange 2e extending radially outward is provided at the tip of the peripheral wall 2d.

[0024] In Figure 3, (a) is a partial plan view showing a part of the fixing plate 3, and (b) is a partial cross-sectional view along EE. The fixing plate 3 in this embodiment is made of a metal plate.

[0025] The fixing plate 3 is circular in plan view and has an opening 3a that penetrates the fixing plate 3. In this embodiment, the inner diameter of the opening 3a is larger than the outer diameter in the X direction at the base of the protrusion 1b. The fixing plate 3 also has two mounting holes 3b that are burred out from the lower surface of the fixing plate 3 and have screw grooves on their inner circumferential surfaces, offset in the X direction from the opening 3a.

[0026] Cable 4 is used, for example, to transmit electrical signals or supply power, and is electrically connected to electrical equipment (not shown) located below the fixing plate 3, and is routed upwards through the opening 3a to the fixing plate 3.

[0027] In this embodiment, the cable 4 is shaped to have a circular cross-sectional shape. The outer diameter of the cable 4 is smaller than the inner diameter of the insertion hole 1c in the X direction, and is approximately the same as the inner diameter in the Y direction.

[0028] Next, the method for assembling the packing 1, washer 2, fixing plate 3, and cable 4 described above will be explained. When assembling these, as shown in Figure 4, the packing 1 should be positioned with the protrusion 1b facing downwards, the washer 2 with the flange 2e facing downwards, and the fixing plate 3 with the burring of the mounting hole 3b facing downwards. With these parts in place, the fixing plate 3, packing 1, and washer 2 should be stacked in that order. Note that the connection between the cable 4 and the electrical equipment (not shown) may be made in advance, or it may be made after attaching the washer 2, etc., to the fixing plate 3.

[0029] Then, the fixing plate 3, packing 1, and washer 2 are stacked in that order, and the cable 4 is inserted through the insertion hole 1c and the washer-side screw insertion hole 2c. As described above, the inner diameter of the washer-side insertion hole 2b is larger than the inner diameter of the insertion hole 1c in the X direction. Also, the outer diameter of the cable 4 is smaller than the inner diameter of the insertion hole 1c in the X direction, and is approximately the same as the inner diameter in the Y direction. In other words, the cable 4 is inserted through the washer-side insertion hole 2b without resistance. Furthermore, as shown in Figure 4(b), the outer surface of the cable 4 and the inner surface of the insertion hole 1c in the Y direction may come into contact, while as shown in Figure 4(a), there is a gap between the outer surface of the cable 4 and the inner surface of the insertion hole 1c in the X direction. Therefore, no significant resistance is generated when inserting the cable 4 into the insertion hole 1c, and the cable 4 can be inserted smoothly into the insertion hole 1c.

[0030] Subsequently, as shown in Figure 5, the screws S are inserted through the screw insertion holes 2c and 1f on the washer side, and the screws S are fastened through the mounting holes 3b of the fixing plate 3. When the screws S are rotated to fasten them through the mounting holes 3b, the washer 2 moves toward the fixing plate 3 until the lower surface of the flange 2e contacts the upper surface of the fixing plate 3, causing the base 1a of the packing 1 to undergo compression deformation between the fixing plate 3 and the washer 2. Here, since the base 1a has a long shape in which the length in the X direction is greater than the length in the Y direction, when it undergoes compression deformation, the amount of deformation in the X direction is greater than the amount of deformation in the Y direction. That is, the insertion holes 1c (especially the first insertion hole 1d) provided in the base 1a deform more in the X direction than in the Y direction. Therefore, the through-hole 1c, which was initially an elongated hole with an inner diameter in the X direction larger than the inner diameter in the Y direction, will become closer to a circular shape as its inner diameter in the X direction decreases. This allows the inner surface of the through-hole 1c to be in close, almost uniform contact with the outer surface of the cable 4 inserted through the through-hole 1c over its entire circumference. In particular, the packing 1 of this embodiment has a protrusion 1b that extends from the base 1a. When the base 1a deforms significantly in the X direction due to compression deformation, the protrusion 1b connected to the base 1a also deforms significantly in the X direction. As a result, both the first through-hole 1d and the second through-hole 1e will become closer to a circular shape as their inner diameters in the X direction decrease. In other words, according to this embodiment, the long through-hole 1c extending from the first through-hole 1d to the second through-hole 1e will be in close contact with the cable 4.

[0031] Furthermore, when the base 1a of the packing 1 is compressed and deformed, the inner diameter of the screw insertion hole 1f provided in the base 1a also decreases, allowing the inner surface of the screw insertion hole 1f to be in close contact with the outer surface of the screw S.

[0032] As described above, with the cable watertight structure according to this embodiment, the work of inserting the cable 4 through the insertion hole 1c of the packing 1 is easy, and when the packing 1 and washer 2 are attached to the fixing plate 3, the inner surface of the insertion hole 1c can be brought into close contact with the outer surface of the cable 4, and the inner surface of the screw insertion hole 1f can be brought into close contact with the outer surface of the screw S, so sufficient watertight performance can be obtained. Furthermore, even if the inner diameter of the insertion hole 1c of the packing 1 and the outer diameter of the cable 4 vary slightly, the effect of making it easy to insert the cable 4 through the insertion hole 1c and the effect of bringing the inner surface of the insertion hole 1c into close contact with the outer surface of the cable 4 are maintained. In addition, the packing 1 of this embodiment has a protrusion 1b on the base 1a, and the insertion hole 1c is longer because it penetrates the base 1a and the protrusion 1b, so the area in contact between the outer surface of the cable 4 and the inner surface of the insertion hole 1c is increased, which can further improve watertight performance.

[0033] The packing 1 described above may be a packing 1B as shown in Figure 6. Here, Figure 6(a) is a plan view of packing 1B, Figure 6(b) is a cross-sectional view along A2-A2, and Figure 6(c) is a cross-sectional view along B2-B2. Packing 1B comprises the base 1a, the protrusion 1b, and the first insertion hole 1d described above, while the portion of the insertion hole 1c that penetrates the protrusion 1b is composed of a second insertion hole 1eB. In plan view, the shape of the second insertion hole 1eB is a circular hole with an inner diameter equal to the inner diameter in the X direction and the inner diameter equal to the inner diameter in the Y direction. In this embodiment, the inner diameter of the circular hole of the second insertion hole 1eB is equal to the inner diameter of the first insertion hole 1d in the Y direction.

[0034] Even with such a packing 1B, when inserting the cable 4 into the insertion hole 1c, there is a gap between the outer surface of the cable 4 and the inner surface of the first insertion hole 1d in the X direction, so the cable 4 can be smoothly inserted into the insertion hole 1c. Although the inner diameter of the second insertion hole 1eB and the outer diameter of the cable 4 are approximately the same, the length of the second insertion hole 1eB is shorter than that of the first insertion hole 1d, so there is not much resistance when inserting the cable 4.

[0035] Then, when the screw S is fastened with the packing 1B positioned between the fixing plate 3 and the washer 2, as in the state shown in Figure 5, the base 1a of the packing 1B is compressed and deformed between the fixing plate 3 and the washer 2. As described above, since the base 1a is elongated in the X direction and longer in the Y direction, the first through hole 1d deforms more in the X direction than in the Y direction. Initially, the first through hole 1d was elongated in the X direction, with its inner diameter in the X direction being larger than its inner diameter in the Y direction, but as the inner diameter in the X direction decreases, it approaches a circular shape.

[0036] Incidentally, since the protrusion 1b of the packing 1B is connected to the base 1a, when the base 1a deforms significantly in the X direction due to compression deformation, the protrusion 1b will also deform in a similar manner. However, since the protrusion 1b is not directly sandwiched between the fixing plate 3 and the washer 2, it may not deform as much as the base 1a. On the other hand, in this embodiment, the second insertion hole 1eB that penetrates the protrusion 1b of the packing 1B is circular, and the inner diameter of the second insertion hole 1eB is equal to the inner diameter in the Y direction of the first insertion hole 1d, which is approximately the same as the outer diameter of the cable 4. Therefore, even if the amount of deformation of the protrusion 1b is insufficient, the inner surface of the second insertion hole 1eB can be brought into close contact with the outer surface of the cable 4.

[0037] The packing 1 described above may be a packing 1C as shown in Figure 7. Here, Figure 7(a) is a plan view of packing 1C, Figure 7(b) is a cross-sectional view along A3-A3, and Figure 7(c) is a cross-sectional view along B3-B3. Packing 1C comprises the base 1a, the protrusion 1b, and the first insertion hole 1d described above, while the portion of the insertion hole 1c that penetrates the protrusion 1b is composed of a second insertion hole 1eC. In plan view, the shape of the second insertion hole 1eC is an elongated hole at the base of the protrusion 1b, where the inner diameter in the X direction is larger than the inner diameter in the Y direction. From there, it gradually approaches a circular hole shape towards the tip of the protrusion 1b, where the inner diameter in the X direction and the inner diameter in the Y direction are equal. In this embodiment, the shape at the base of the protrusion 1b is the same as that of the first insertion hole 1d. Furthermore, the inner diameter of the second insertion hole 1eC, which is circular at the tip of the protrusion 1b, is equal to the inner diameter of the first insertion hole 1d in the Y direction.

[0038] Even with such a packing 1C, when inserting the cable 4 into the insertion hole 1c, there is a gap between the outer surface of the cable 4 and the inner surface of the first insertion hole 1d in the X direction, so the cable 4 can be smoothly inserted into the insertion hole 1c. The tip of the protrusion 1b of the second insertion hole 1eC is circular, and its inner diameter is approximately the same as the outer diameter of the cable 4, but the rest of the hole is elongated, so there is not much resistance when inserting the cable 4.

[0039] When the screw S is fastened with the packing 1C placed between the fixing plate 3 and the washer 2, the base 1a of the elongated packing 1C is compressed and deformed between the fixing plate 3 and the washer 2, causing the elongated insertion hole 1c to approach a circular shape. Here, the protrusion 1b is not directly sandwiched between the fixing plate 3 and the washer 2, so it may not deform as much as the base 1a. Also, it is expected that the amount of deformation at the protrusion 1b at this time will decrease as it moves away from the base 1a (from the root of the protrusion 1b towards the tip). On the other hand, in this embodiment, although the packing 1C has an elongated shape at the root of the protrusion 1b where the inner diameter in the X direction is larger than the inner diameter in the Y direction, it gradually approaches a circular shape towards the tip of the protrusion 1b, and at the tip of the protrusion 1b it has a circular shape where the inner diameter in the X direction and the inner diameter in the Y direction are equal. Therefore, even if the amount of deformation of the protrusion 1b is insufficient, the inner surface of the second insertion hole 1eC can be brought into close contact with the outer surface of the cable 4.

[0040] Although one embodiment of the present invention has been described above, the present invention is not limited to such specific embodiments, and unless otherwise specifically limited in the above description, various modifications and changes are possible within the scope of the spirit of the present invention as described in the claims. For example, the configurations of the embodiments described above can be added or deleted as appropriate, and the configuration of one embodiment can be provided in other embodiments. Furthermore, the effects in the embodiments described above are merely illustrative of the effects that may arise from the present invention, and do not mean that the effects of the present invention are limited to the effects described above.

[0041] For example, the packing 1 described above had a protrusion 1b on its base 1a, but the protrusion 1b may be omitted. Also, the protrusion 1b was shaped to decrease in diameter from the base to the tip in consideration of ease of attachment to the opening 3a provided in the fixing plate 3, but it may also protrude with the same shape from the base to the tip. [Explanation of Symbols]

[0042] 1, 1B, 1C: Packing 1a: Base 1b: Convex part 1c: Through hole 1d: First insertion hole 1e, 1eB, 1eC: Second insertion hole 2: Washer 3: Fixing plate (object) 3a:Aperture 4: Cable

Claims

1. A cable watertight structure for sealing the end of a cable pulled out from an object, A packing having an insertion hole through which the cable is inserted, The device comprises a washer that is attached to the object and compresses and deforms the packing between itself and the object, thereby pressing the insertion hole against the outer surface of the cable, The packing has a long shape in which the length in the first direction along the object is greater than the length in the second direction that intersects the first direction along the object. The insertion hole is elongated, with an inner diameter in the first direction being larger than the inner diameter in the second direction. The packing comprises a base portion that is compressed and deformed between the object and the washer on one side of the object, and a convex portion that protrudes from the base portion and is inserted into an opening provided in the object, and protrudes through the opening to the other side of the object. The aforementioned insertion hole penetrates the base and the protrusion, forming a waterproofing structure for the cable.

2. A cable watertight structure for sealing the end of a cable pulled out from an object, A packing having an insertion hole through which the cable is inserted, The device comprises a washer that is attached to the object and compresses and deforms the packing between itself and the object, thereby pressing the insertion hole against the outer surface of the cable, The packing has a long shape in which the length in the first direction along the object is greater than the length in the second direction that intersects the first direction along the object. The insertion hole is elongated, with an inner diameter in the first direction being larger than the inner diameter in the second direction. The packing comprises a base portion that is compressed and deformed between the object and the washer, and a protrusion that extends from the base portion and is inserted into an opening provided in the object. The aforementioned through hole penetrates the base portion and the protrusion portion. The aforementioned through hole is composed of a first through hole that penetrates the base and a second through hole that penetrates the protrusion. The first insertion hole is elongated, with an inner diameter in the first direction being larger than the inner diameter in the second direction. A cable watertight structure in which the second insertion hole is a circular hole in which the inner diameter in the first direction and the inner diameter in the second direction are equal.

3. A cable watertight structure for sealing the end of a cable pulled out from an object, A packing having an insertion hole through which the cable is inserted, The device comprises a washer that is attached to the object and compresses and deforms the packing between itself and the object, thereby pressing the insertion hole against the outer surface of the cable, The packing has a long shape in which the length in the first direction along the object is greater than the length in the second direction that intersects the first direction along the object. The insertion hole is elongated, with an inner diameter in the first direction being larger than the inner diameter in the second direction. The packing comprises a base portion that is compressed and deformed between the object and the washer, and a protrusion that extends from the base portion and is inserted into an opening provided in the object. The aforementioned through hole penetrates the base portion and the protrusion portion. The aforementioned through hole is composed of a first through hole that penetrates the base and a second through hole that penetrates the protrusion. The first insertion hole is elongated, with an inner diameter in the first direction being larger than the inner diameter in the second direction. A cable watertight structure, wherein the second insertion hole is an elongated hole at the base of the protrusion where the inner diameter in the first direction is larger than the inner diameter in the second direction, and a circular hole at the tip of the protrusion where the inner diameter in the first direction and the inner diameter in the second direction are equal.

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