Wire harness sealing plug

Abstract

The present invention provides a wire harness sealing plug comprising: a sealing plug body which is attached to a motor housing and which is in sealing contact with the housing through an outer peripheral surface; one or more harness holes for holding a harness, the harness holes being formed by penetrating through the inner and outer surfaces of the sealing plug body; and one or more sealing parts formed by reducing the diameter of the inner wall of the wire harness hole toward the inner side, each sealing part having a sealing surface extending by a predetermined distance in the axial direction of the wire harness hole, the sealing surfaces being in sealing contact with the wire harness, and the sum of the lengths of all the sealing surfaces in sealing contact with the wire harness being E, E being the sum of the lengths of all the sealing surfaces in sealing contact with the wire harness, and E being the sum of the lengths of all the sealing surfaces in sealing contact with the wire harness. The axial length of the wire harness hole is set as G, and the value of E / G is 0.05-0.8.

Description

Technical Field

[0001] The present invention relates to a wire harness sealing plug, and more particularly to a wire harness sealing plug for a drive motor of a new energy vehicle. Background Art

[0002] The wire harness sealing plug is used to seal the motor housing. As Figure 1 shown, the wire harness sealing plug 200 is installed in a through hole in the housing 1 and seals the housing 1. One end of the wire harness 3 passing through the wire harness sealing plug 200 is located outside the motor housing (i.e., above in Figure 1 ), and the other end is located inside the motor housing (i.e., below in Figure 1 ). Figure 2 FIG. shows one example of using a wire harness sealing plug, which is a schematic view when observing the wire harness sealing plug from above the housing. Among them, the wire harness passes through a wire harness hole 204 formed in the wire harness sealing plug 200. As Figure 3 、 Figure 4 shown, the wire harness 3 contacts a plurality of sealing lips 205 inside the wire harness hole 204, thereby sealing the inside and outside of the housing.

[0003] However, when using the above-mentioned wire harness sealing plug to seal the motor housing, the sealing performance sometimes decreases or even fails, resulting in air outside the housing (outer side) entering the housing interior (inner side) or liquid such as cooling oil inside the housing leaking to the outside of the housing. This may cause a significant reduction in the cooling efficiency of the cooling system of the motor, leading to overheating and damage of the motor. After external air, dust, water vapor, etc. enter the housing interior, it will cause the liquid such as cooling oil to deteriorate more severely, thereby reducing the working efficiency of the cooling and lubrication systems, and further affecting the life of the motor.

[0004] In addition, the wire harness sealing plug is usually made of rubber and has low strength and cannot resist the pressure impact in the axial direction X. Therefore, as Figure 5 shown, in order to resist the pressure impact in the axial direction X and ensure the sealing performance, a limiting structure 206 needs to be provided on the motor housing 1, thereby preventing the wire harness sealing plug from sliding in the through hole of the motor housing. However, the formation of the limiting structure makes the structure of the motor housing complex, increases the difficulty of the processing technology, and reduces the productivity. Summary of the Invention (Problems to be Solved by the Invention)

[0005] As described above, there is room for further improvement in the sealing performance of the existing wire harness sealing plug. Moreover, in order to improve the productivity, it is necessary to further simplify the production process. Therefore, the present invention provides a wire harness sealing plug with reliable sealing performance. In addition, the present invention can also provide a wire harness sealing plug that not only has reliable sealing performance but also improves the production efficiency. (Solutions for Solving the Problems)

[0006] The present inventor has studied the above-mentioned existing wire harness sealing plugs, and in particular, has deeply explored the reasons for the decline in sealing performance. It is found that when the strength of the wire harness is low, the leakage phenomenon sometimes becomes serious. Further research reveals that a wire harness with low strength is prone to bending when passing through the wire harness hole. As shown in Figure 6 , a gap is generated between the bent wire harness and the sealing lip, resulting in a decrease in sealing performance or even sealing failure. However, if the wire harness hole diameter is further reduced to avoid wire harness bending, it will increase the difficulty of threading the wire and reduce the productivity. After in-depth research, the present inventor found that by increasing the contact distance between the sealing lip and the wire harness and controlling this contact distance within a certain range, not only does it not affect the threading efficiency, but it can also further improve the sealing effect between the sealing lip and the wire harness. Thus, the present invention is achieved.

[0007] Specifically, the present invention can be implemented through the following embodiments. [1] A wire harness sealing plug, comprising: a sealing plug body, which is installed on the motor housing and is in sealing contact with the housing through its outer peripheral surface; one or more wire harness holes, which are used to hold the wire harness and are formed by penetrating the inner and outer surfaces of the sealing plug body. The wire harness holes include one or more sealing portions, which are formed by reducing the diameter of the inner wall of the wire harness hole inward. The sealing portion has a sealing surface extending a predetermined distance along the axial direction of the wire harness hole, and this sealing surface is in sealing contact with the wire harness. In the wire harness hole, when the sum of the distances of the sealing surfaces in sealing contact with the wire harness is set as E, and the axial length of the wire harness hole is set as G, the value of E / G is 0.05 to 0.8. In this specification, the "inner wall of the wire harness hole" refers to the inner surface that has not been reduced in diameter. The above-mentioned multiple wire harness holes can have the same structure. There are no particular limitations on the number and arrangement position of the wire harness holes, and they can be arbitrarily selected according to actual needs. It should be noted that in the case where the entire sealing portion is in sealing contact with the wire harness, the sealing surface constitutes the sealing portion. The number of sealing portions can be selected according to the axial length of the wire harness hole. [2] In the above-mentioned wire harness sealing plug, the wire harness hole can vertically penetrate the inner and outer surfaces of the sealing plug body and have a cylindrical inner surface (i.e., the inner wall), and the sealing portion can be two or more, and the sealing surface is preferably a smooth cylindrical surface. [3] In the above-mentioned wire harness sealing plug, when the outer diameter of the wire harness is set as the inner diameter of the sealing surface is , then [4]In the above-mentioned wire harness sealing plug, the wire harness hole may further include a bent portion, which is an inclined surface formed by inclining the inner wall of the wire harness hole towards the inside. One end of the bent portion is connected to the inner wall of the wire harness hole, and the other end is connected to the sealing surface. The acute angle formed by the bent portion and the plane where the sealing surface is located is preferably 5° to 45°. The bent portion is formed by inclining the inner wall of the wire harness hole towards the inside at an acute angle, that is, in the radial direction of the wire harness hole, the inner wall of the wire harness hole, the bent portion, and the sealing portion do not overlap. In addition, the acute angle formed by the bent portion and the sealing surface means the angle formed inside the wire harness hole by the extended surface of the bent portion and the sealing surface along the axial direction of the wire harness hole. [5]In the above-mentioned wire harness sealing plug, let the outer diameter of the wire harness be The inner diameter of the wire harness hole is It should be noted here that the inner diameter of the above-mentioned wire harness hole refers to the inner diameter of the inner wall of the wire harness hole. [6]In the above-mentioned wire harness sealing plug, it may further include a reinforcing member, which is arranged in the sealing plug main body. The sealing plug main body may be made of rubber, and the compression ratio of the wire harness sealing plug when it is installed on the motor housing is 5% to 35%. By arranging the reinforcing member, the wire harness sealing plug in the present invention does not need to form a limiting structure on the housing, thereby simplifying the manufacturing process of the wire harness sealing plug and improving the production efficiency. In order to improve the strengthening effect, it is preferable that the reinforcing member is arranged in the center of the sealing plug main body. [7]In the above-mentioned wire harness sealing plug, the reinforcing member is a metal skeleton, and the metal skeleton includes a first reinforcing portion extending along the axial direction and a second reinforcing portion formed by extending from one end of the first reinforcing portion towards the radial inside. The first reinforcing portion is arranged at a position close to the radial outside in the sealing plug main body. There is no particular limitation on the shape of the above-mentioned first reinforcing portion. For example, it can be formed in a cylindrical shape. There is no particular limitation on the shape of the second reinforcing portion. For example, it can be formed in a ring shape so as to surround all the wire harness holes. There is no particular limitation on the cross-sectional shape of the metal skeleton. For example, it can be formed in an inverted L shape. In addition, the above-mentioned second reinforcing portion can be coplanar with the sealing plug main body. By such an arrangement, the reinforcing member can be reliably and easily positioned during the manufacturing process. [8]In the above-mentioned wire harness sealing plug, the outer peripheral surface of the sealing plug main body has an outer peripheral sealing portion that is in sealing contact with the housing, and the outer peripheral sealing portion extends along the inside and outside direction of the housing. As long as reliable sealing between the wire harness sealing plug and the housing can be ensured, there is no particular limitation on the structure of the above-mentioned outer peripheral sealing portion. For example, it can be formed as a cylindrical surface extending along the inside and outside direction of the housing. [9]In the above-mentioned wire harness sealing plug, the outer peripheral surface of the sealing plug body is recessed radially inward at at least one end to form a recess. When the wire harness sealing plug is installed on the motor housing, the recess can accommodate the part of the wire harness sealing plug that is compressed and extruded in the inner and outer directions of the housing. The existence of the above-mentioned recess leaves a gap between the outer peripheral surface of the wire harness sealing plug and the housing, so that when the wire harness sealing plug is installed on the housing, it can accommodate the part of the sealing plug body that is extruded and deformed due to interference fit.

[10] In the above-mentioned wire harness sealing plug, the ratio of the total axial length of each sealing surface to the wire harness hole is 0.02 - 0.8. By setting the ratio of the length of each sealing surface to the wire harness hole within the above range, the balance between the sealing performance between the wire harness and the wire harness hole and the insertion efficiency when the wire harness passes through the wire harness hole can be further ensured. (Advantages of the Invention)

[0008] Through the wire harness sealing plug of the present invention, the sealing reliability between the wire harness and the sealing surface can be improved, and further, the strength of the wire harness sealing plug can be improved, the structure of the wire harness sealing plug can be simplified, thereby improving the production efficiency. Description of the Drawings

[0009] Figure 1 A schematic diagram showing a wire harness sealing plug installed on a motor housing in the prior art. Figure 2 Showing the wire harness sealing plug as viewed from above the housing Figure 1 A schematic diagram of the wire harness sealing plug shown. Figure 3 Showing Figure 2 A - A cross - sectional view of the wire harness sealing plug shown. Figure 4 Showing Figure 3 An enlarged view of the part shown at B in Figure 5 Showing the limiting structure formed in the housing. Figure 6 A schematic diagram showing a wire harness bent in the prior art. Figure 7 A schematic diagram of the wire harness sealing plug according to an embodiment of the present invention. Figure 8 Showing Figure 7 A C - C cross - sectional view of the wire harness sealing plug shown. Figure 9 Showing Figure 8 An enlarged view of the part shown at D in Figure 10 Showing the relationship between the axial distance of the sealing surface and the length of the wire harness hole. Figure 11Schematic diagram showing the installation of the wire harness sealing plug of the present invention on the motor housing. Figure 12 Schematic diagram showing the diameters of the wire harness sealing plug of the present invention before and after compression. Figure 13 Stereogram showing an example of the metal skeleton of the present invention. Figure 14 Stereogram showing the wire harness sealing plug of the present invention. Figure 15 Show the inner diameter of the inner wall of the wire harness hole and the sealing surface. Description of the Marks

[0010] 1 Housing; 2, 200 Wire harness sealing plug; 3 Wire harness; 4, 204 Wire harness hole; 5 Sealing part (surface); 6 Metal skeleton; 61 First reinforcing part; 62 Second reinforcing part; 7 Bending part; 205 Sealing lip; 206 Limiting structure; X Axial direction of the wire harness hole. Detailed implementation mode

[0011] The following will explain the implementation mode of the present invention in detail based on the drawings.

[0012] Figure 7 It is a plan view when observing the wire harness sealing plug 2 from the inside of the housing, Figure 8 It is a sectional view of the wire harness sealing plug 2. In the wire harness sealing plug 2 with a circular shape in the plan view, 8 wire harness holes 4 with a cylindrical inner surface are provided. In Figure 7 In the shown plan view, 4 wire harness holes are arranged at equal intervals on the large-diameter circumference concentric with the wire harness sealing plug 2, and the other 4 wire harness holes are arranged at equal intervals on the small-diameter circumference concentric with the wire harness sealing plug 2, and the connection line between the center of each wire harness hole and the center of the wire harness sealing plug 2 divides the circumference into eight equal parts.

[0013] As Figure 7 , Figure 8 shown, in the wire harness sealing plug 2, the metal skeleton 6 is arranged in the center of the sealing plug main body, and the metal skeleton 6 is arranged concentrically with the sealing plug main body. As Figure 8 , Figure 13 shown, the metal skeleton 6 includes a cylindrical first reinforcing part 61 and a circular second reinforcing part 62. The first reinforcing part 61 is located on the radially outer side of the sealing plug main body, and the second reinforcing part 62 extends from one end of the first reinforcing part 61 to the radially inner side and surrounds all the wire harness holes. The outer surface of the second reinforcing part 62 is coplanar with the outer surface of the sealing plug main body ( Figure 8 is the lower surface in

[0014] As Figure 8 , Figure 9As shown, the wire harness hole 4 vertically penetrates through the inner and outer surfaces of the sealing plug body, and the wire harness 3 passes through the wire harness hole 4. A part of the inner wall (inner surface) of the wire harness hole 4 is reduced in diameter towards the inside of the wire harness hole 4 to form a sealing portion, and this sealing portion has a sealing surface 5, and this sealing surface 5 contacts the outer surface of the wire harness 3 to achieve sealing. The axial end portions of the sealing surface (portion) 5 are respectively connected to the bending portions 7, and these bending portions 7 are formed by inclining the inner wall of the wire harness hole 4 inward by 5° to 45°.

[0015] In the present invention, by appropriately extending the sealing contact distance between the sealing surface 5 and the wire harness 3 along the axial direction X, it is possible to reliably improve the sealing performance between the wire harness 3 and the wire harness hole 4 while not affecting the insertion efficiency of the wire harness passing through the wire harness hole. In the present invention, the wire harness hole may include one or more sealing surfaces. As Figure 10 shown, it may include more than 2 sealing surfaces, and the sealing contact distances between each sealing surface and the wire harness are respectively set as E1, E2, E3,.... The above E1, E2, E3,... may be the same or different. Considering the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, when the length of the wire harness hole 4 along the axial direction X is G and the sum of the sealing contact distances between each sealing surface 5 and the wire harness 3 along the axial direction X is E (that is, E1 + E2 + E3 +...), the ratio of E / G is preferably 0.05 to 0.8, more preferably 0.1 to 0.6. When the ratio of E / G is lower than 0.05, the contact distance between the sealing surface 5 and the wire harness 3 along the axial direction X is short, and it is difficult to reliably hold the wire harness 3 along the axial direction X. The wire harness 3 may be bent inside the wire harness hole 4, resulting in a decrease in the sealing performance between the sealing surface 5 and the wire harness 3 or even sealing failure. When the ratio of E / G is greater than 0.8, the contact distance between the sealing surface 5 and the wire harness 3 along the axial direction X is too long. Although the wire harness 3 can be more reliably held along the axial direction X, it may lead to an increase in the difficulty of passing the wire harness through, that is, a decrease in the insertion efficiency of the wire harness, thereby reducing the production efficiency. When the ratio of E / G is in the range of 0.05 to 0.8, especially in the range of 0.1 to 0.6, the sealing surface can correct the extension state of the wire harness in the wire harness hole, so that it does not bend and always maintains an axial extension along the wire harness hole, so that the sealing surface can reliably make a sealing contact with the wire harness, and at the same time does not affect the insertability of the wire harness passing through the wire harness hole. Thus, the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole (sealing surface) can be reliably achieved. It should be noted that in Figures 8 - 10 this case, the sealing surface is the sealing portion.

[0016] In addition, in order to further improve the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, it is preferred that as Figure 10 shown, each sealing surface is arranged at equal intervals in the axial direction of the wire harness hole.

[0017] In consideration of the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, the ratio of the distance (E1 or E2 or E3 or...) at which each sealing surface is in sealing contact with the wire harness to the length G of the wire harness hole is preferably 0.02 to 0.8, that is, E1 / G, E2 / G, E3 / G... are respectively 0.02 to 0.8. When the above ratio is less than 0.02, the contact distance between each sealing part and the wire harness along the axial direction is short, and it is sometimes difficult to reliably hold the wire harness along the axial direction, resulting in the possibility that the wire harness may be bent in the wire harness hole, thereby reducing or even invalidating the sealing performance between the sealing part (surface) and the wire harness. When the above ratio is greater than 0.8, the contact distance between the sealing part (surface) and the wire harness along the axial direction is too long, which may lead to an increase in the difficulty of passing the wire harness through, that is, the insertion efficiency of the wire harness is reduced, thereby reducing the production efficiency. In consideration of further improving the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, the values of E1 / G, E2 / G, E3 / G... are more preferably 0.05 to 0.6, and particularly preferably 0.1 to 0.5.

[0018] In the present invention, when the outer diameter of the wire harness is and the inner diameter of the sealing surface is it is preferred that the following relationship exists: By making the outer diameter of the wire harness and the inner diameter of the sealing surface satisfy the above relationship, the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole can be improved. In order to further reliably improve the balance between the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, it is preferably 9% to 40%.

[0019] In the present invention, when the outer diameter of the wire harness is and the inner diameter of the wire harness hole is it is preferred that the following relationship exists: By making the outer diameter of the wire harness and the inner diameter of the wire harness hole satisfy the above relationship, the structure of the wire harness hole can be optimized, so that the material used can be minimized as much as possible when manufacturing the wire harness sealing plug. At the same time, the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole can be taken into account. In order to further optimize the structure of the wire harness hole and take into account the insertion efficiency when the wire harness passes through the wire harness hole and the sealing performance between the wire harness and the wire harness hole, it is preferably 3% to 40%.

[0020] Inside the harness hole 4, the angle (acute angle) F formed between the bent portion 7 and the surface where the sealing surface 5 is located is not particularly limited, and is preferably 5° to 45°, and particularly preferably 10° to 35°. When the outer diameter of the harness, the inner diameter of the sealing surface, and the inner diameter of the harness hole satisfy the above relationship, by making the angle F satisfy the above range, the setting of the sealing surface in the harness hole can be further optimized, so that the insertion efficiency of the harness when passing through the harness hole and the sealing between the harness and the harness hole can be taken into account while minimizing the overall manufacturing material of the harness sealing plug.

[0021] The wiring harness sealing plug of the present invention is installed in the through hole of the motor housing by interference fit. Figure 11 As shown, the wire harness sealing plug 2 includes a metal skeleton 6, which is arranged in the sealing plug body near the outer peripheral side to improve the overall strength of the wire harness sealing plug 2. The outer surface of the second reinforcement part 62 is coplanar with the outer surface of the sealing plug body, thereby enabling the metal skeleton to be reliably and easily positioned during the manufacturing process.

[0022] In order to take into account both installation and sealing properties, the compression rate of the harness sealing plug 2 when installed in the housing is preferably 5% to 35%, and particularly preferably 8% to 30%. Figure 11 As shown, no limiting structure is formed on the housing. However, since the wire harness sealing plug of the present invention includes a reinforcing member and the compression rate of the wire harness sealing plug satisfies the above range, even if a limiting structure is not formed on the housing, the wire harness sealing plug 2 can reliably resist the axial impact force and prevent the wire harness sealing plug from sliding in the through hole of the motor housing, thereby ensuring the sealing of the wire harness sealing plug to the housing without affecting the installation of the wire harness sealing plug. When the compression rate of the wire harness sealing plug is lower than 5%, the sealing of the wire harness sealing plug to the through hole of the housing may be reduced, and when the compression rate of the wire harness sealing plug is higher than 35%, the rubber of the outer peripheral part of the sealing plug body may be damaged after compression, thereby shortening the service life of the wire harness sealing plug.

[0023] like Figure 11 As shown, the outer peripheral surface of the sealing plug body has a cylindrical surface extending in the inner and outer directions of the housing, and the cylindrical surface contacts the inner surface of the through hole of the housing as an outer peripheral sealing portion, thereby reliably sealing the inside and outside of the housing. The outer peripheral surface of the sealing plug body is reduced in diameter radially inward at the outer end to form a recessed portion. By forming this recessed portion, on the one hand, it is convenient to install the wiring harness sealing plug, and on the other hand, by forming a gap between the outer peripheral surface of the sealing plug body and the inner surface of the through hole of the housing, it is possible to accommodate the portion of the rubber sealing plug body that is deformed due to interference fit.

[0024] Next, combine Figure 12 The measurement of the compression rate of the harness sealing plug is described. The diameter of the harness sealing plug 2 before installation, that is, the diameter before compression is defined as The diameter of the wire harness seal plug 2 after being installed in the through-hole of the housing in an interference fit manner, that is, the compressed diameter (the diameter of the through-hole), is set to If the radial distance between the outer peripheral surface of the first reinforcing portion 61 of the metal skeleton 6 centered thereon and the outer peripheral surface of the seal plug main body is set to K, the compression rate of the wire harness seal plug 2 after being installed in the housing is expressed as: In the present invention, as described above, the compression rate is preferably 5% to 35%, and particularly preferably 8% to 30%.

[0025] There is no particular limitation on the manufacturing method of the wire harness seal plug of the present invention. For example, it can be manufactured by molding methods such as injection molding, injection molding, and compression molding. When the wire harness seal plug includes a reinforcing member, first, the reinforcing member is centered and positioned in the mold, and then rubber is filled into the mold, thereby manufacturing the wire harness seal plug of the present invention. Industrial Applicability The wire harness seal plug of the present invention can be used, for example, as a wire harness seal plug for a driving motor of a new energy vehicle.

Claims

1. A wiring harness sealing plug, comprising: A sealing plug body, which is mounted on the motor housing and is in sealing contact with the housing through an outer peripheral surface; One or more harness holes are used to hold the harness and are formed by penetrating the inner and outer surfaces of the sealing plug body. The wire harness sealing plug is characterized in that: The harness hole includes one or more sealing parts formed by reducing the diameter of the inner wall of the harness hole inward, the sealing part having a sealing surface extending a predetermined distance in the axial direction of the harness hole, the sealing surface being in sealing contact with the harness, The total length of the sealing surface in seal contact with the harness is defined as E, and the axial length of the harness hole is defined as G. The value of E / G is 0.05 to 0.

8.

2. The wire harness sealing plug according to claim 1, wherein: The harness hole vertically penetrates the inner and outer surfaces of the sealing plug body and has a cylindrical inner surface. The sealing surface is formed as a cylindrical surface.

3. The wire harness sealing plug according to claim 1 or 2, wherein: Assume the outer diameter of the harness is The inner diameter of the sealing surface is 4. The wire harness sealing plug according to any one of claims 1 to 3, wherein: The harness hole includes a bent portion, which is an inclined surface formed by tilting the inner wall of the harness hole toward the inner side of the harness hole, one end of the bent portion is connected to the inner wall of the harness hole, and the other end is connected to the sealing surface. The acute angle formed by the bending portion and the surface where the sealing surface is located is 5° to 45°.

5. The wire harness sealing plug according to any one of claims 1 to 4, wherein: Assume the outer diameter of the harness is The inner diameter of the harness hole is 6. The wire harness sealing plug according to any one of claims 1 to 5, wherein: The invention also includes a reinforcing member, which is arranged in the sealing plug body, and the sealing plug body is made of rubber. The compression rate of the harness sealing plug when installed in the motor housing is 5% to 35%.

7. The wire harness sealing plug according to claim 6, wherein: The reinforcement member is a metal frame including a first reinforcement portion extending along the axial direction and a second reinforcement portion formed by extending radially inwardly from one end of the first reinforcement portion, and the first reinforcement portion is arranged radially outside the sealing plug body.

8. The wire harness sealing plug according to any one of claims 1 to 7, wherein: The outer peripheral surface of the sealing plug body has an outer peripheral sealing portion that is in sealing contact with the motor housing, and the outer peripheral sealing portion extends in the inner and outer directions of the motor housing.

9. The wire harness sealing plug according to any one of claims 1 to 8, wherein: The outer peripheral surface of the sealing plug body is recessed radially inward at at least one end to form a recessed portion.

10. The wire harness sealing plug according to any one of claims 1 to 9, wherein: The ratio of each sealing surface to the axial length of the harness hole is 0.02 to 0.8.

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