JP2009168192A - Seal structure of pipe insertion opening of waterproof vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure of a pipe insertion opening of a waterproof vessel, preventing water from penetrating into the inside of the waterproof vessel by preventing a grommet from being ridden up with respect to high-pressure water flowing from all directions to the pipe insertion opening. <P>SOLUTION: This seal structure 19 of the pipe insertion opening of the waterproof vessel seals by the grommet 20 a clearance between the pipe insertion opening 18 of the waterproof vessel 12 storing an inverter 11 and a pipe 16 inserted into the pipe insertion opening 18 and exposed from the waterproof vessel. A flange 17 is provided in a position brought into contact with the grommet 20 on the outer peripheral surface of the pipe 16. Further in the seal structure 19, there exist three seal portions, that is, a seal portion 24 for the inner wall of the pipe insertion opening, in which the grommet 20 is pushed to and brought into contact with the inner wall of the pipe insertion opening 18, a seal portion 23 for the outer peripheral surface of the pipe, in which the grommet is pushed to and brought into contact with the outer peripheral surface of the pipe, and a seal portion 25 for the outer wall of the waterproof vessel, in which the grommet is pushed to and brought into contact with the outer wall of the waterproof vessel around the pipe insertion opening. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a seal structure of a pipe insertion port of a waterproof container, particularly a seal structure in which a grommet is installed in a gap between the waterproof container and the pipe, and the outer peripheral surface of the pipe inserted into the pipe insertion port contacts the grommet The present invention relates to a seal structure in a pipe outer peripheral surface seal portion.

  There are several electronic components installed in the engine room of the vehicle, but these electronic components are stored in a waterproof container and severe waterproof measures are taken because they cause malfunctions and breakdowns when wet. . As an electronic component installed in the engine room of a vehicle, for example, an inverter in a hybrid vehicle can be cited. The inverter is installed in a waterproof container because it may cause a short circuit if the printed circuit board gets wet. However, because of the large amount of heat generated, the inverter is attached to the cooling water connected to the cooler. The introduction pipe protrudes from the pipe insertion port of the waterproof container.

  The waterproofing of the piping insertion port is ensured by a seal structure in which a grommet is installed in the gap between the waterproof container and the piping, but when the vehicle body is washed with high pressure, high-pressure water enters from the opening of the engine room and the piping insertion port The high pressure water hits directly on the seal structure and the grommet swells, and the water may penetrate into the waterproof container. In piping with protrusions such as ribs for quick connectors on the outer peripheral surface, such as piping for introducing cooling water in inverter coolers, the grommet is used to straddle the ribs when the grommet is fitted into the piping. If the high-pressure water hits directly from the pipe insertion direction against the pipe outer peripheral surface seal part where the pipe outer peripheral surface is in contact with the grommet, the grommet swells up. It is easy to happen.

  In view of such a situation, several seal structures have been proposed. For example, in Patent Document 1, in a rotating electrical machine in which a lead wire is inserted through a grommet and taken out of an end frame, the end frame has a mounting seat surface for mounting the grommet. First and second projecting walls projecting outward from the outer peripheral surface of the end frame are provided on both sides of the attached grommet in the circumferential direction and on the rear end side in the axial direction. A rotating electrical machine is disclosed in which both sides in the circumferential direction and the rear end side in the axial direction of the grommet are covered in a substantially U shape. According to this structure, when the high pressure water directly hits the end frame from the side of the grommet and from the rear end in the axial direction, the first and second protruding walls receive the high pressure water. It is possible to prevent the direct hit of high-pressure water against the seal portion that comes into contact. Patent Document 2 discloses a grommet that seals between a through-hole such as a pipe insertion port formed in a wall portion of a waterproof container and the like and an insertion member such as a pipe that passes through the through-hole, and is in contact with the insertion member A grommet having an obtuse angle of the pressure acting side surface in the sealing portion is disclosed.

JP 2004-260930 A JP2004-40940

  However, the seal structure of Patent Document 1 cannot cope with direct hitting of high-pressure water from the pipe insertion direction, and high-pressure water directly hits the pipe outer peripheral surface seal portion where the outer peripheral surface of the pipe contacts the grommet. Can not be prevented from drowning. In addition, the pipe insertion port inner wall seal portion where the waterproof container and the grommet are in contact with each other cannot cope with the direct hit of high-pressure water from the pipe insertion direction, and the grommet may be swollen. Even in the seal structure using the grommet of Patent Document 2, it is difficult to prevent the grommet from rolling up when high-pressure water directly hits from a shallow angle with respect to the pipe insertion direction. The high-pressure water may be used not only for washing the car body but also for cleaning the inside of the engine room, in which case there is a possibility that the high-pressure water directly hits the pipe insertion port from any direction. As described above, according to the conventional technology, it is not possible to cope with a direct hit of high-pressure water from a specific direction, that is, a pipe insertion direction.

  An object of the present invention is to provide a waterproof container capable of preventing the grommets from rising and preventing water from entering the waterproof container even for high-pressure water coming from all directions with respect to the pipe insertion port. It is to provide a seal structure for a pipe insertion port.

  The sealing structure of the piping insertion port of the waterproof container according to the present invention includes a waterproof container having a piping insertion port placed in an engine room of a vehicle, piping inserted into the piping insertion port of the waterproof container, and a grommet. In the sealing structure of the pipe insertion port of the waterproof container, the grommet has a pipe insertion port inner wall seal portion that is pressed against and contacted with the inner wall of the pipe insertion port and a pipe outer surface seal portion that is pressed against and contacted with the outer peripheral surface of the pipe. And it has a flange which shields high pressure water with respect to a pipe peripheral surface seal part of a grommet on a pipe peripheral surface.

  Moreover, it is preferable that a flange is arrange | positioned so that it may contact with the edge part of the piping outer peripheral surface sealing part of a grommet, or adjoins with a predetermined distance.

  The seal structure of the pipe insertion port of the waterproof container according to the present invention is a line-of-sight angle formed by the line of sight from the opening surface of the engine room to the end of the pipe outer peripheral surface seal part of the grommet and the central axis of the pipe at the pipe insertion port In a region within 45 degrees, at least a part of the flange is set to have a protruding height of the flange and a predetermined distance between the flange and the end of the pipe outer peripheral surface seal portion of the grommet. It is preferable.

  Moreover, it is preferable that a grommet has a waterproof container outer wall seal part which presses and contacts the waterproof container outer wall around a piping insertion port.

  Furthermore, the waterproof container preferably has a guard that shields high-pressure water against the waterproof container outer wall seal portion of the grommet on the outer wall adjacent to the end portion of the waterproof container outer wall seal portion of the grommet with a predetermined distance.

  The sealing structure of the pipe insertion port of the waterproof container according to the present invention includes the pipe insertion port inner wall seal part that is pressed against and contacted with the inner wall of the pipe insertion port, and the pipe outer peripheral surface seal part that is pressed against and contacted with the pipe outer peripheral surface. Therefore, even when high-pressure water directly hits the seal structure from any direction, water does not easily enter the waterproof container. Since the pipe which is a constituent element of the seal structure according to the present invention has a flange which shields high-pressure water against the pipe outer peripheral surface seal portion of the grommet on the pipe outer peripheral surface, the pipe is connected to the pipe outer peripheral surface seal portion of the grommet. It is possible to reduce the direct hit of high-pressure water coming from the insertion direction.

  Further, since the flange is disposed so as to be in contact with or adjacent to the end of the pipe outer peripheral surface seal part of the grommet with a predetermined distance, high-pressure water coming from the pipe insertion direction with respect to the pipe outer peripheral surface seal part of the grommet. The direct hit can be greatly reduced.

  The seal structure of the pipe insertion port of the waterproof container according to the present invention is a line-of-sight angle formed by the line of sight from the opening surface of the engine room to the end of the pipe outer peripheral surface seal part of the grommet and the central axis of the pipe at the pipe insertion port In a region within 45 degrees, at least a part of the flange shields the high-pressure water, and the predetermined height of the flange and the predetermined distance between the flange and the end of the pipe outer peripheral surface sealing portion of the grommet are set. Therefore, the direct hit of the high-pressure water coming from that region does not occur on the pipe outer peripheral surface seal portion of the grommet.

  Moreover, since the grommet has a waterproof container outer wall seal portion that is pressed against and contacts the outer wall of the waterproof container around the pipe insertion port, direct hit of high pressure water against the pipe insertion port inner wall seal part of the grommet does not occur.

  Further, the waterproof container has a guard that shields high-pressure water against the waterproof container outer wall seal portion of the grommet on the adjacent outer wall in contact with the end of the waterproof container outer wall seal portion of the grommet or at a predetermined distance. The direct hit of the high-pressure water coming from the direction orthogonal to the pipe insertion direction can be significantly reduced with respect to the container outer wall seal portion.

  Therefore, according to the sealing structure of the pipe insertion port of the waterproof container according to the present invention, the grommets can be prevented from rising even in high-pressure water coming from all directions with respect to the pipe insertion port, and into the waterproof container. It becomes possible to prevent water from entering.

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram showing an arrangement of a waterproof container 12 storing an inverter 11 in an engine room 10 of a hybrid vehicle. As shown in FIG. 1, the waterproof container 12 storing the inverter 11 is arranged on the left front side in the engine room. The engine room 10 has large openings 13 at the front and lower parts of the vehicle, and high-pressure water enters the engine room 10 from the openings 13 during high-pressure car washing. Therefore, the high-pressure water may directly hit the waterproof container 12 in which the inverter 11 is stored. In the following, the electronic component stored in the waterproof container 12 will be described as the inverter 11, but the electronic component may be various electronic control units (ECU) such as a motor and an engine, various sensors, a battery, and the like. .

  FIG. 2 is a diagram illustrating an appearance of the inverter 11. The inverter 11 is a power conversion device that converts high voltage DC power and AC power such as a motor generator. Since the inverter 11 may cause a short circuit when the printed wiring board 14 gets wet, it is stored in the waterproof container 12 and installed in the engine room 10 as described above.

  Since the inverter 11 generates a large amount of heat, a cooler 15 is attached, and a pipe 16 for introducing cooling water (Long Life Coolant; LLC, hereinafter referred to as LLC) is installed in the cooler 15. The pipes 16 are respectively installed on both side surfaces of the cooler 15, and LLC is introduced into the cooler 15 from the left side pipe 16 (IN side pipe), and the LLC is introduced from the right side pipe 16 (OUT side pipe). Discharged. The waterproof container 12 is disposed in the engine room 10 with the left side surface of the inverter 11 facing the front of the vehicle. A flange 17 described later is provided on the outer peripheral surface of the pipe 16.

  FIG. 3 is a diagram illustrating an appearance of the waterproof container 12 to which a seal structure 19 (hereinafter referred to as a seal structure 19) of the pipe insertion port 18 of the waterproof container 12 is applied. An inverter 11 is stored in the waterproof container 12, and a pipe 16 protrudes from a pipe insertion port 18 of the waterproof container 12. Since the diameter of the pipe insertion port 18 is larger than the diameter of the pipe 16, a grommet 20 that closes the gap is installed. A rubber hose 21 that returns to the LLC supply tank is connected to the pipe 16 by a simple connecting device 22. A flange 17 that covers the entire outer peripheral surface is provided on the outer peripheral surface of the pipe 16 so as to be in contact with the grommet 20.

  As described above, the seal structure 19 seals the gap between the pipe insertion port 18 of the waterproof container 12 that stores the inverter 11 and the pipe 16 that is inserted through the pipe insertion port 18 and comes out of the waterproof container with the grommet 20. The structure has a flange 17 at a position in contact with the grommet 20 on the outer peripheral surface of the pipe 16. In the following, in addition to FIG. 3, the components of the seal structure 19 and the arrangement of the components will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view of the seal structure 19. FIG. 5 is a cross-sectional view showing the relationship between the opening 13 of the engine room 10 and the seal structure 19.

  The waterproof container 12 is a member having a function of storing and sealing an electronic device such as the inverter 11 and preventing water from entering the inside. The waterproof container 12 is provided with a space in which the inverter 11 can be stored and a pipe insertion port 18 for taking out the pipe 16 to the outside. The pipe insertion port 18 is a hole penetrating the wall surface of the waterproof container, and the diameter of the pipe insertion port 18 is set larger than the diameter of the pipe 16. The pipe insertion port 18 is provided on each of the left side surface and the right side surface (not shown) of the waterproof container 12, and one pipe 16 is arranged from each side.

  As the waterproof container 12, an aluminum material container is used from the viewpoints of light weight and heat dissipation, but is not limited thereto. In addition to the pipe insertion port 18, two cables 33 connected to the motor generator are drawn out from the waterproof container 12. In addition, the insertion port of these two cables is installed so that the high pressure water coming from any opening part 13 of the engine room 10 may not hit directly. Even when high-pressure cleaning is performed in the engine room 10, the direct hit of high-pressure water is shielded by surrounding structures and the like.

  The pipe 16 is a member having a function of introducing LLC into the cooler 15 attached to the inverter 11 stored in the waterproof container 12. The pipe 16 has a straight cylindrical shape, and has a hollow portion through which LLC flows. The length of the pipe 16 is not particularly limited, but it is necessary to ensure a length that does not hinder the removal of the simple connection device 22 from the viewpoint of improving workability of maintenance. As the material of the pipe 16, stainless steel is exclusively used, but a material such as resin can also be used.

  The pipe 16 has a flange 17 on the outer peripheral surface of the pipe. The flange 17 is configured to cover the entire outer peripheral direction of the pipe 16 and has a function of shielding high-pressure water with respect to the pipe outer peripheral surface seal portion 23 of the grommet described later.

  A method of forming the flange 17 on the outer peripheral surface of the pipe 16 is not particularly limited, but bulging or beading of the pipe 16 can be applied. Both bulge processing and bead processing are processing methods for expanding the whole or a part of the piping outward. Bulge processing is a method of filling a desired working portion of the pipe 16 to the outside by filling the internal cavity of the pipe 16 with a working fluid such as oil and applying high pressure to the filled working fluid. The bead processing is a method in which a mandrel is placed in the internal cavity of the pipe 16, and a roller is pressed against the outer periphery for molding. In any method, a mold having a concave portion or a convex portion corresponding to the shape and size of the flange 17 is used. The flange 17 can also be formed on the outer peripheral surface of the pipe 16 by attaching a member that forms the flange 17 on the outer peripheral surface of the pipe 16 by welding or the like. The size and arrangement of the flange 17 will be described later.

  The grommet 20 is a member having a function of closing the gap between the waterproof container 12 and the pipe 16 at the pipe insertion opening 18. Therefore, the waterproof container 12 is tightly sealed by the grommet 20, and water can be prevented from entering the inside. As shown in FIG. 3, the grommet 20 is a rubber member having a donut shape with a hole into which the pipe 16 is fitted. Since it is a rubber member, it has elasticity and can be deformed.

  The grommet 20 is inserted into the pipe insertion port 18 after being fitted into the pipe 16 protruding from the pipe insertion port 18. As shown in FIG. 4, the seal structure 19 includes a pipe insertion port inner wall seal portion 24 where the grommet 20 is pressed against and contacted with the inner wall of the pipe insertion port 18, and a pipe outer peripheral surface seal portion which is pressed against and contacted with the pipe outer peripheral surface. There are three seal portions of the waterproof container outer wall seal portion 25 that are pressed against and contact the outer wall of the waterproof container around the pipe insertion port 23.

  The pipe insertion opening inner wall seal portion 24 is a part of the grommet 20 where the inner wall of the pipe insertion opening 18, that is, the thickness portion of the wall of the waterproof container 12 and the grommet 20 come into contact. The grommet 20 has a diameter (hereinafter, referred to as an outer diameter) inserted into the pipe insertion port 18 that is slightly larger than the diameter of the pipe insertion port 18. Since the grommet 20 is a rubber member as described above, the grommet 20 has elasticity, can be deformed in shape, and can be inserted into the pipe insertion port 18 smaller than the outer diameter. Therefore, since the grommet 20 that has been deformed and inserted into the pipe insertion port 18 attempts to return to its original shape, the grommet 20 is pressed against and contacts the inner wall of the pipe insertion port 18.

  The strength with which the grommet 20 is pressed against the inner wall of the pipe insertion port 18 is mainly determined from the relationship between the outer diameter of the grommet 20 and the diameter of the pipe insertion port 18 and the elasticity of the grommet 20. If the pressing strength is increased, the sealing performance of the pipe insertion port inner wall seal portion 24 is preferably increased. Therefore, when the elastic performance of the grommet 20 is the same, it is preferable that the outer diameter of the grommet 20 is large as long as it can be inserted into the pipe insertion port 18. If the elasticity is too high, the grommet easily deforms and rises when high-pressure water hits directly, so it is necessary to select an appropriate one.

  The pipe outer peripheral surface seal portion 23 is a part of the grommet 20 where the outer peripheral surface of the pipe 16 and the grommet 20 are in contact with each other. The grommet 20 has a diameter of the donut-shaped hole (hereinafter referred to as an inner diameter) slightly smaller than the diameter of the pipe 16. Similar to the pipe insertion opening inner wall seal portion 24, the grommet 20 is pressed against and contacts the outer peripheral surface of the pipe 16.

  The strength with which the grommet 20 is pressed against the outer peripheral surface of the pipe 16 is weaker than in the case of the pipe insertion opening inner wall seal portion 24. Since the flange 17 and the rib 26 for the simple connection device are provided on the outer peripheral surface of the pipe 16, the flange 17 and the rib 26 for the simple connection device are straddled when the grommet 20 is fitted into the pipe 16. Because it becomes. Accordingly, the ratio of the diameter of the pipe 16 in the pipe outer peripheral surface seal portion 23 to the inner diameter of the grommet 20 is larger than the ratio of the outer diameter of the grommet 20 to the diameter of the pipe insertion port 18. As with the pipe insertion opening inner wall seal portion 24, the inner diameter of the grommet 20 is preferably small as long as it can be fitted into the pipe 16.

  As described above, the flange 17 has a structure that covers the entire outer peripheral direction of the pipe 16, and the height protruding from the outer peripheral surface of the pipe is constant over the entire outer peripheral direction. The projecting height of the flange 17 is set to the same height as the rib 26 for the simple connecting device.

  The flange 17 is provided at a position in contact with or adjacent to the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet 20. The position of the flange 17 is such that the line-of-sight angle formed by the line of sight 29 from the engine room opening surface 28 to the end 27 of the grommet pipe outer peripheral surface seal 23 and the pipe central axis 30 at the pipe insertion port is within 45 degrees. In this area, it is possible to determine that at least a part of the flange shields the high-pressure water. Here, the line of sight 29 is a straight line drawn from any one of the opening surfaces 28 of the engine room, and passes through the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet. The central axis 30 of the pipe at the pipe insertion port means a straight line passing through the center of the internal cavity of the pipe 16 located at the pipe insertion port 18 in the pipe insertion direction. The line-of-sight angle can be rephrased as an angle with respect to the pipe insertion direction at the pipe insertion port, and the line-of-sight angle of 45 degrees means an intermediate direction between the pipe insertion direction and the direction perpendicular to the pipe insertion direction. The central axis 30 is a straight line parallel to the pipe insertion direction unless the pipe 16 is bent, and the line-of-sight angle is determined by the line-of-sight line 29.

  As shown in FIG. 5, when the flange 17 and the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet 20 are in contact with each other, the line of sight 29 where the line-of-sight angle is within 45 degrees is naturally a part of the flange. Will pass through the department.

  In the above description, the flange 17 is described as being in contact with the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet 20, but may be adjacent to each other with a predetermined distance. As described above, the predetermined distance can be determined based on the fact that the line of sight 29 having a line of sight angle of 45 degrees passes through the flange 17.

  The waterproof container outer wall seal portion 25 is a portion where the outer wall surface of the waterproof container 12 and the grommet 20 are in contact with each other. The grommet 20 is pressed against and contacts the outer wall of the waterproof container around the pipe insertion opening. The strength of this pressing depends on the force applied to the grommet 20 when the grommet 20 is inserted into the pipe insertion port 18 regardless of the outer diameter or inner diameter of the grommet 20.

  The waterproof container outer wall seal portion 25 has a role of shielding the direct hit of high-pressure water coming from the pipe insertion direction with respect to the pipe insertion port inner wall seal portion 24. The waterproof container outer wall seal portion 25 is directly hit by high-pressure water from all directions. Since the high-pressure water coming from the pipe insertion direction acts in a direction to improve the sealing performance, the grommet 20 does not swell even if hit directly. On the other hand, when high-pressure water coming from a direction orthogonal to the pipe insertion direction hits directly, the grommet 20 may swell, so the protruding height of the grommet 20 from the outer wall surface of the waterproof container 12 is low. Is preferred.

  As shown in FIG. 5, the waterproof container has a guard 31 that shields high-pressure water against the waterproof container outer wall seal part of the grommet on the adjacent outer wall in contact with the end of the waterproof container outer wall seal part of the grommet or at a predetermined distance. Can be provided. The protruding height of the guard 31 and the predetermined distance from the end portion 32 of the waterproof container outer wall seal portion 25 are determined from the same viewpoint as in the case of the flange 17.

  The operation of the seal structure 14 having the above-described configuration, particularly the high-pressure water shielding effect of the flange 17 will be described in detail below with reference to FIGS. FIG. 6 is a diagram illustrating a state in which high-pressure water directly strikes the pipe outer peripheral surface seal portion 23 of the seal structure 19. FIG. 7 is a diagram illustrating a state in which high-pressure water directly strikes the waterproof container outer wall seal portion 25.

  As shown in FIG. 6A, when the flange 17 does not exist on the outer peripheral surface of the pipe 16, high-pressure water (α) coming from the pipe insertion direction is against the end portion 27 of the pipe outer peripheral surface seal portion 23. Direct hit and the grommet 20 is drowned. When the grommet 20 is rolled up, the pipe outer peripheral surface seal portion 23 does not function and water enters the inside of the waterproof container 12.

  On the other hand, as shown in FIG. 6B, when the flange 17 exists on the outer peripheral surface of the pipe 16, the high-pressure water (α) and (β) coming from the pipe insertion direction is removed from the pipe outer peripheral surface seal portion 23. A direct hit to the end portion 27 can be prevented. Since the flange 17 is provided in contact with the end portion 27 of the pipe outer peripheral surface seal portion 23, the high-pressure water (α) and (β) coming from the pipe insertion direction directly hits the flange 17 and the flange 17 has a high pressure. Shield water. Therefore, the high-pressure water (α) and (β) coming from the pipe insertion direction does not directly hit the end portion 27 of the pipe outer peripheral surface seal portion 23, and the grommet 20 does not swell.

  When the high-pressure water comes from a direction (γ) orthogonal to the pipe insertion direction, the high-pressure water directly hits the end portion 27 of the pipe outer peripheral surface seal portion 23. However, since the high-pressure water (γ) coming from the direction orthogonal to the pipe insertion direction acts in a direction to improve the sealing performance, the grommet 20 does not swell even if hit directly.

  As described above, in the pipe outer peripheral surface seal portion 23, the possibility that the grommet 20 is swollen is high when the high-pressure water (α) and (β) coming from a direction with a line-of-sight angle of 45 degrees or less hits directly. . As shown in FIG. 6B, the flange 17 is arranged so that the flange 17 and the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet 20 are in contact with each other. Is not directly hit by the pipe outer peripheral surface seal portion 23. On the other hand, the flange 17 may be disposed adjacent to the end portion 27 of the pipe outer peripheral surface seal portion 23 of the grommet 20 with a predetermined distance. Even in this case, as described above, the line-of-sight line 29 having a line-of-sight angle of 45 degrees can be determined using the flange 17 as a guideline. There is no direct hit on the outer peripheral surface seal portion 23. Therefore, the piping outer peripheral surface seal portion 23 does not cause the grommets 20 to swell due to the high pressure water.

  As shown in FIG. 7, the pipe insertion port inner wall seal portion 24 is shielded from high-pressure water coming from all directions by the waterproof container outer wall seal portion 25 and does not hit directly. On the other hand, the waterproof container outer wall seal portion 25 is directly hit by high-pressure water from all directions.

  In the waterproof container outer wall seal portion 25, the grommets 20 may be rolled up when high-pressure water (γ) coming from a direction orthogonal to the pipe insertion direction hits directly. However, since the direction in which the force is applied to the grommet 20 by the high pressure water and the direction (A) in which the grommet 20 is pressed against the inner wall of the pipe insertion port are contradictory, the influence of the high pressure water direct impact is small. In addition, as described above, since the protruding height of the grommet 20 from the outer wall surface of the waterproof container 12 is extremely low, the pipe insertion port inner wall seal part 24 protected by the waterproof container outer wall seal part 25 is not affected.

  As described above, according to the seal structure 19, it is possible to prevent the grommet from rolling up and prevent water from entering the waterproof container even for high-pressure water coming from all directions with respect to the pipe insertion port. Is possible.

It is a figure which shows arrangement | positioning of the waterproof container which stored the inverter in the engine room of a hybrid vehicle. It is a figure which shows the external appearance of an inverter. It is a figure which shows the external appearance of the waterproof container to which the seal structure of the piping insertion port of a waterproof container is applied. It is sectional drawing of the seal structure of the piping insertion port of a waterproof container. It is sectional drawing which shows the relationship between the opening part of an engine room, and the seal structure of the piping insertion port of a waterproof container. It is a figure which shows a mode that high pressure water hits directly with respect to the piping outer peripheral surface seal part 23 of the seal structure of the piping insertion port of a waterproof container. It is a figure which shows a mode that high pressure water hits directly with respect to the waterproof container outer wall seal part 25 of the seal structure of the piping insertion port of a waterproof container.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Engine room, 11 Inverter, 12 Waterproof container, 13 Opening part, 14 Printed wiring board, 15 Cooler, 16 Piping, 17 Flange, 18 Piping insertion port, 19 Seal structure of piping insertion port of waterproofing container, 20 Grommet, 21 Rubber hose, 22 Simple connection tool, 23 Grommet pipe outer peripheral surface seal part, 24 Grommet pipe insertion port inner wall seal part, 25 Grommet waterproof container outer wall seal part, 26 Quick connector rib, 27 Grommet pipe outer peripheral surface seal part End portion, 28 Open surface, 29 Line of sight, 30 Center axis of piping at piping insertion port, 31 Guard, 32 End portion of grommet waterproof container outer wall seal portion, 33 Cable connected to motor generator.

Claims (5)

A waterproof container having a pipe insertion port placed in an engine room of a vehicle, a pipe inserted into the pipe insertion port of the waterproof container, and a grommet, the grommet being pressed against and contacted with the inner wall of the pipe insertion port In the seal structure of the pipe insertion port of the waterproof container having the pipe outer peripheral surface seal part that is pressed against and contacted with the inner wall seal part of the insertion port and the pipe outer peripheral surface,
Piping has a flange which shields the high pressure water with respect to the piping outer peripheral surface sealing part of a grommet on the outer peripheral surface of piping, The sealing structure of the piping insertion port of a waterproof container characterized by the above-mentioned. In the sealing structure of the pipe insertion port of the waterproof container according to claim 1,
A sealing structure for a pipe insertion port of a waterproof container, wherein the flange is disposed so as to be in contact with or adjacent to an end of a pipe outer peripheral surface seal part of the grommet with a predetermined distance. In the seal structure of the pipe insertion port of the waterproof container according to claim 1,
In a region where the line-of-sight angle formed by the line of sight from the opening of the engine room to the end of the grommet pipe outer peripheral seal and the central axis of the pipe at the pipe insertion opening is within 45 degrees, at least part of the flange is at high pressure A sealing structure for a pipe insertion port of a waterproof container, wherein a protruding height of the flange and a predetermined distance between the flange and the end of the pipe outer peripheral surface sealing part of the grommet are set so as to shield water. In the sealing structure of the pipe insertion port of the waterproof container according to any one of claims 1 to 3,
The grommet has a waterproof container outer wall seal portion that is pressed against and contacts the outer wall of the waterproof container around the pipe insertion opening. In the sealing structure of the pipe insertion port of the waterproof container according to any one of claims 1 to 4,
The waterproof container has a guard for shielding high-pressure water against the waterproof container outer wall seal part of the grommet on the outer wall adjacent to the end part of the waterproof container outer wall seal part of the grommet or at a predetermined distance. The piping structure of the pipe insertion port.

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