JP2006140011A - Waterproof grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof grommet obtaining a cable with good manufacturing property and assembling workability in a cable component for a hybrid electric vehicle. <P>SOLUTION: The waterproof grommet comprises a shield base member made of a conductive material and a wire seal member made of an elastic insulation material. The shield base member includes an auxiliary machine contacting surface contacted and fixed on a chassis wall surface of a connection auxiliary machine, and a cylindrical part formed perpendicular to the auxiliary machine contacting surface. The wire seal member inserted and coupled in the cylindrical part includes an insertion-coupling surface sticking on an inner peripheral wall of the cylindrical part, an auxiliary machine facing surface facing to the chassis wall surface of the connection auxiliary machine, an annular first convex part formed on the auxiliary machine facing surface, an electric wire penetrating hole with an opening arranged inside of the annular first convex part, and an annular second convex part formed along the inner peripheral wall of the electric wire penetrating hole. The waterproof to a cable terminal part is achieved by crimping the first convex part to the chassis wall surface of the connection auxiliary machine and also crimping the second convex part to the cable. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a cable component for a hybrid electric vehicle, and relates to a waterproof grommet for realizing a cable excellent in manufacturability and assembly workability.

As shown in FIG. 5, two types of high voltage cables for electric vehicles are generally used: a DC cable 102 that connects the high voltage battery 100c and the inverter 100b, and an AC cable 101 that connects the inverter 100b and the motor 100a. ing. Among these, for the AC cable 101 connecting the inverter 100b and the motor 100a, a three-phase AC method (three-phase AC cable) that allows easy control of the motor 100a is used, and this AC cable 101 is mainly arranged in the engine room. It was.
The three-phase AC cable 101 arranged in the engine room has an exterior (shield) for shielding noise in addition to the energization function for each polarity. The shield is grounded to the vehicle body via the housing wall surface 110 of the connection auxiliary machine 100 (motor 100a or inverter 100b). Further, the terminal portion 101a of the AC cable 101 is connected to a connection auxiliary device in a state where waterproofness is ensured, and the motor 100a and the inverter 100b are energized through the AC cable 101. As described above, various AC cables having a shield earth connection function and a waterproof function have been developed. (For example, see Patent Document 1)

According to the prior art, as shown in FIG. 6, a sheet metal in which an end 103 a of a flat mesh shield 103 covering three AC cables 101 is fixed to a casing wall surface 110 of a connection auxiliary machine (for example, an inverter). By attaching to the component 104, a shielded earth connection was achieved.
That is, the shield end 103a is fixed to the sheet metal part 104 using the ferrule 105, and the sheet metal part 104 is fixed to the casing wall surface 110 of the connecting auxiliary machine using the bolt 106. Thus, the current accumulated in the shield 103 that shields noise is conducted to the wall surface 110 of the casing, and the shield ground connection is secured.
According to the prior art, through-holes through which the AC cables 101 pass are formed in the casing wall surface 110 of the connection auxiliary machine, the AC cables 101 are passed through the through-holes by waterproofing, and the cable terminal portions 101a are connected. Connected to a connected accessory.
That is, the wire seal 107 is provided on the outer periphery of the AC cable disposed in the through hole in the wall surface of the housing, the resin for fixing the wire seal 107 to the cable side is molded, and the resin and the cable are further fixed. By providing a wire seal 107 for waterproofing, waterproofing is achieved in one through-hole through which one AC cable 101 passes, and this waterproofing process is applied to each cable so that it is connected to a connection accessory. The cable terminal portion 101a is waterproofed.
JP 2002-260773 A

In the prior art, in order to waterproof the terminal portion of the AC cable connected to the connection auxiliary machine, a through-hole through which one AC cable passes is formed in the wall surface of the casing for the number of cables, and each cable is further connected. Each had to be waterproofed. Accordingly, in the case of a three-phase AC cable, it is necessary to assemble and process the three cables, which causes an increase in cost and deterioration in assembling workability.
In addition, since the through holes into which the AC cable provided with the wire seal 107 is fitted must be formed on the wall surface of the housing for the number of cables, the surface area of the housing wall must be designed to be large, and a plurality of through holes In order to ensure the strength even if the holes are formed, the wall surface of the housing has to be thickened.

  Therefore, the waterproof grommet according to the present invention is a waterproof grommet composed of a shield base member made of a conductive material and a wire seal member made of an elastic insulating material, and the shield base member is grounded to the casing wall surface of the connection accessory. The wire seal member fitted into the cylinder portion is in close contact with the inner peripheral wall of the cylinder portion. A fitting surface to be connected, an accessory facing surface facing the housing wall surface of the connecting accessory, an annular first convex portion formed on the accessory facing surface, and an inner side of the annular first convex portion A shield base member tube having an end portion of a shield that has an electric wire through hole in which an opening is disposed and an annular second convex portion formed along an inner peripheral wall of the electric wire through hole and shields cable noise Auxiliary equipment grounding Is secured to the wall surface of the connecting accessory by grounding and securing a shield earth connection, and the first convex portion of the wire seal member fitted in the cylindrical portion is crimped to the housing wall surface of the connecting accessory. At the same time, the second convex portion is crimped to a cable penetrating the electric wire through hole, thereby waterproofing the cable terminal portion connected to the connection auxiliary machine.

According to the waterproof grommet of the present invention, the end of the shield that shields the noise of the cable is attached to the outer periphery of the cylindrical portion of the shield base member made of a conductive material, and the auxiliary equipment grounding surface of the shield base member is connected to the auxiliary equipment Since it is grounded and fixed to the wall surface of the housing, a shield earth connection can be secured.
The wire seal member made of an elastic insulating material fitted into the cylindrical portion of the shield base member has an annular first convex portion formed on the surface facing the auxiliary machine and an opening inside the annular first convex portion. And an annular second convex portion formed on the inner peripheral wall of the electrical wire through hole, and the first convex portion is crimped to the casing wall surface of the connection auxiliary machine, thereby the annular shape. Inundation of water into the first convex portion is prevented and the second convex portion is crimped to a cable passing through the electric wire through hole, thereby preventing water from entering the electric wire through hole.
That is, in the waterproof grommet according to the present invention, each of the wire through-holes can be formed by simply passing the cable through the wire through-hole of the wire seal member made of an elastic insulating material fitted into the cylindrical portion of the shield base member made of a conductive material. The terminal portions of a plurality of cables penetrating can be waterproofed together. For this reason, for example, in an engine, a plurality of AC cables can be routed together in a state where a shield ground connection function and a waterproof function are ensured, so that assembly workability can be improved and costs can be reduced. be able to.
In addition, since the cable terminal portion can be waterproofed by the wire seal member fitted in the cylindrical portion of the shield base member, there is no need to apply waterproof treatment to the through hole in the housing wall surface of the connection auxiliary machine. There is no need to provide a through hole for each cable on the wall of the housing. In other words, it is only necessary to form a through-hole through which a plurality of cables are penetrated collectively on the casing wall surface of the connection auxiliary machine, which improves the assembly workability and reduces the surface area of the casing wall surface. The wall surface can also be made thinner.

  A waterproof grommet according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view for explaining the structure of a waterproof grommet 10 according to the present invention.
A waterproof grommet 10 according to the present invention includes a shield base member 1 made of a conductive material and a wire seal member 2 made of an elastic insulating material.
The shield base member 1 includes an auxiliary machine grounding surface 11 that is grounded and fixed to a casing wall surface 110 of a connected auxiliary machine, and a cylindrical tube portion 12 that is formed perpendicular to the auxiliary machine grounding surface 11. The end 3a of the shield 3 that shields the noise of the cable is attached to the outer periphery of the cylindrical portion 12. An auxiliary machine grounding surface 11 is formed with an auxiliary machine fixing hole 13 into which a bolt 5 for fixing the shield base member 1 to the housing wall surface 110 of the connected auxiliary machine is inserted.
The wire seal member 2 is fitted in the cylindrical portion 12 of the shield base member 1, and the fitting surface 24 that is in close contact with the inner peripheral wall of the cylindrical portion 12 and the auxiliary device that faces the housing wall surface 110 of the connecting auxiliary device. It has a facing surface 25 and a wire through hole 26 through which the cable 20 inserted through the inside of the shield 3 attached to the shield base member 1 passes. One cable 20 passes through one electric wire through hole 26.

Both ends of the cylindrical portion 12 of the shield base member 1 are open, and the auxiliary equipment facing surface 25 of the wire seal member 2 fitted in the cylindrical portion 12 is disposed in the opening on the connecting auxiliary equipment side. In the waterproof grommet 10 in which the wire seal member 2 is fitted in the cylindrical portion 12 of the shield base member 1, the annular first convex portion 21 formed on the auxiliary device facing surface 25 is an auxiliary device of the shield base member 1. It protrudes from the ground plane 11.
Thus, when the waterproof grommet 10 is attached to the casing wall surface 110 of the connected auxiliary machine, the auxiliary machine grounding surface 11 of the shield base member 1 is grounded and fixed to the casing wall surface 110 and the wire seal member 2 is fixed. The annular first convex portion 21 formed on the auxiliary device facing surface 25 is pressure-bonded to the housing wall surface 110.
Note that the opening 26 a of the electric wire through hole through which the cable 20 passes is disposed inside the annular first convex portion 21.

An annular second convex portion 22 is formed on the inner peripheral wall of the wire through hole 26 of the wire seal member 2 so as to make a round along the inner peripheral wall.
Thereby, when the cable 20 is passed through the wire through hole 26, the annular second convex portion 22 formed on the inner peripheral wall of the wire through hole is crimped to the cable 20.

  That is, by connecting the annular first convex portion 21 formed on the wire seal member 2 to the casing wall surface 110 of the connection auxiliary machine, the connection is made between the casing wall surface 110 of the connection auxiliary machine and the waterproof grommet 10. Infiltration into the cable terminal portion 20a connected to the auxiliary machine is prevented, and the annular second convex part 22 is crimped to the cable 20 to connect to the connected auxiliary machine from the electric wire through hole 26 through which the cable 20 passes. Inundation into the cable terminal portion 20a is prevented.

  FIG. 2 is a view showing the shield base member 1 and the wire seal member 2 constituting the waterproof grommet 10 according to the embodiment of the present invention.

The shield base member 1 shown in FIG. 2A is formed so as to be perpendicular to the center of the auxiliary machine grounding surface 11 and the auxiliary machine grounding surface 11 that contacts the housing wall surface 110 of a connected auxiliary machine such as a motor or an inverter. And a cylindrical cylindrical portion 12 formed. In this embodiment, the cylindrical cylindrical portion 12 is formed on the shield base member 1, but the cylindrical portion shape is not limited to the cylindrical shape, and for example, a cylindrical portion having an elliptical cylindrical section shape is formed. May be.
The shield base member 1 is made of a conductive material such as metal.
The auxiliary machine grounding surface 11 is formed with two auxiliary machine fixing holes 13 into which bolts 5 for fixing the shield base member 1 to the casing wall surface 110 of the connected auxiliary machine are inserted.
Further, a wire seal grounding portion 14 is formed around the opening of the cylindrical portion, and the grounding surface 11 of the auxiliary machine is recessed, and the wire seal grounding portion 14 includes an outer edge portion 25a of the auxiliary device facing surface 25 of the wire seal member 2. Two seal fixing holes 15 are formed to engage with the engaging protrusions 27 formed in.

FIG. 2B is a view showing the wire seal member 2 according to the embodiment of the present invention.
The wire seal member 2 according to this embodiment is formed in a columnar shape in accordance with the inner peripheral shape of the cylindrical portion 12 of the shield base member 1, and a fitting surface 24 that is in close contact with the inner peripheral wall of the cylindrical portion 12. And an auxiliary machine facing surface 25 facing the housing wall surface 110, and an electric wire through hole 26 through which the cable 20 passes. In this embodiment, the three wire through holes 26 are arranged in a triangular shape (triangular shape) in the cylindrical wire seal member 2, but the inner peripheral cross-sectional shape of the cylindrical portion 12 of the shield base member 1 is, for example, elliptical. May be designed so that the wire seal member 2 is formed in an elliptical column shape in accordance with the inner peripheral shape of the cylindrical portion, and the three electric wire through holes 26 are linearly arranged.
The wire seal member 2 is made of an elastic insulating material such as resin, silicon resin, or rubber material.
Further, in the wire seal member 2 according to this embodiment, an annular first convex portion 21 is formed on the auxiliary machine facing surface 25, and an opening 26 a of an electric wire through hole 26 through which one cable 20 passes is formed inside. One is arranged.
Furthermore, an engagement protrusion 27 is formed on the outer edge portion 25a of the auxiliary device facing surface 25. Then, the cylindrical wire seal member 2 is fitted into the cylindrical tube portion 12 of the shield base member 1, and the engagement protrusion 27 is engaged with the seal fixing hole 15 of the shield base member 1. The shield base member 1 and the wire seal member 2 are fixed.

  With reference to FIG. 3, the waterproof grommet by the Example of this invention is demonstrated.

As shown in FIG. 3, in the waterproof grommet 10 according to the embodiment of the present invention, the end portion (shield end portion) 3a of the flat mesh-like shield 3 covering a plurality of (three) cables 20 energized between the connecting accessories. Is attached to the outer periphery of the cylindrical portion 12 of the shield base member 1, and the ferrule 4 is fitted on the outer side thereof, thereby fixing the shield 3 to the shield base portion 1.
Further, the bolt 5 is inserted into the auxiliary machine fixing hole 13 formed in the auxiliary machine grounding surface 11 of the shield base member 1 and tightened to tighten the auxiliary machine grounding surface 11 to the casing wall surface 110 of the connected auxiliary machine. Ground and fix to.
As a result, the current accumulated in the shield 3 that shields the noise of the cable 20 energizing between the connected auxiliary machines is conducted to the casing wall surface 110 of the connected auxiliary machine via the shield base member 1 made of a conductive material. A ground connection is ensured.
In addition, since the wire seal member 2 made of an elastic insulating material is disposed in the cylindrical portion 12 of the shield base member 1, the current accumulated in the shield 3 is conducted to the cable 20 via the shield base member 1. There is no fear.

Furthermore, in the waterproof grommet 10 according to the embodiment of the present invention, the annular first convex portion 21 formed on the auxiliary device facing surface 25 of the wire seal member 2 fitted into the cylindrical portion 12 of the shield base member 1 is connected to the auxiliary auxiliary device. By pressure bonding to the housing wall surface 110, water intrusion from between the housing wall surface 110 and the waterproof grommet 10 is prevented (first waterproof structure), and an annular second convex formed in the electric wire through hole 26. By crimping the portion 22 to the cable 20, water intrusion from the wire through hole 26 is prevented (second waterproof structure), and the waterproofing of the cable terminal portion 20 a connected to the connection auxiliary machine is prevented by these two waterproof structures. I am trying.
In this embodiment, the shield base member 1 and the wire seal member 2 are firmly bonded by crimping the annular third convex portion 23 formed on the fitting surface 24 of the wire seal member 2 to the inner peripheral wall of the cylindrical portion 12. And the waterproofing between the shield base member 1 and the wire seal member 2 is achieved (third waterproof structure).

And while crimping | bonding the 1st convex part 21 to the housing | casing wall surface 110 of a connection auxiliary machine, and crimping | bonding the 2nd convex part 22 to the cable 20 which penetrates the electric through-hole 26, the waterproof to the cable terminal part 20a is carried out. Since this can be achieved collectively, it is not necessary to provide waterproofing in the through-holes of the casing wall surface 110 of the connection auxiliary machine.
Therefore, in the embodiment shown in FIG. 3, instead of forming a through hole for each cable in the housing wall surface 110 as in the prior art, one cable through which three cables 20 penetrate through the housing wall surface 110 together. A through hole was formed, and each cable terminal portion 20a penetrating the through hole was connected to a connection auxiliary machine.

The waterproof structure of the waterproof grommet 10 according to the present invention will be described with reference to the wire seal member 2 shown in FIG.
4A is a plan view of the wire seal member 2, FIG. 4B is a cross-sectional view taken along the line AA of FIG. 4A, and FIG. 4C is FIG. It is BB sectional drawing of.

The cylindrical wire seal member 2 shown in FIG. 4 includes a fitting surface 24 that is in close contact with the inner peripheral wall of the cylindrical portion 12 of the shield base member 1 and an auxiliary device facing surface 25 that faces the housing wall surface of the connected auxiliary device. And three wire through holes 26 through which one cable 20 passes.
An annular first convex portion 21 is formed on the auxiliary device facing surface 25, and three wire through-hole openings 26a are arranged inside the annular first convex portion 21 (FIG. 4A). )).
The openings 26a (circular shape) of the three electric wire through holes are arranged in a triangular shape so as to be 120 ° apart from the center of the annular first convex portion 21.

In the waterproof grommet 10 in which the wire seal member 2 is fitted in the cylindrical portion 12 of the shield base member 1, the annular first convex portion 21 is disposed so as to protrude from the auxiliary machine ground surface 11 of the shield base member 1. Is done.
Thus, when the waterproof grommet 10 is attached to a connecting accessory such as a motor or an inverter, the accessory grounding surface 11 of the shield base member 1 is grounded and fixed to the housing wall surface 110 of the connecting accessory, and the wire An annular first convex portion 21 formed on the auxiliary device facing surface 25 of the seal member 2 is pressure-bonded to the housing wall surface of the connecting auxiliary device, and between the housing wall surface 110 and the waterproof grommet 10, the annular first protrusion 21 is formed. It is possible to prevent water from entering the inside of the one convex portion 21.
That is, the three cable terminal portions 20a connected to the connection auxiliary machine are made by passing the cables 20 through the three electric wire through holes 26 in which the openings 26a are arranged inside the first convex portion 21, respectively. It can be waterproofed together.

Each of the electric wire through holes 26 is formed with three annular second convex portions 22 that make a round along the inner peripheral wall thereof (see FIGS. 4B and 4C).
In addition, it is preferable to form so that the internal diameter of the electric wire through-hole 26 of the part in which the cyclic | annular 2nd convex part 22 was formed is a little smaller than the cable diameter of the cable 20 which penetrates the electric wire through-hole 26.
Thereby, the annular second convex portion 22 formed on the inner peripheral wall of the electric wire through hole 26 is crimped to the cable 20 penetrating the electric wire through hole 26, and the electric wire through hole 26 through which the cable 20 passes It is possible to prevent water from entering the inside of the second protrusion 22 (on the side of the connected auxiliary machine).
That is, the cable terminal portion 20a connected to the connection auxiliary machine can be waterproofed by passing the cable 20 inserted through the shield 3 through the wire through hole 26 of the wire seal member 2.

Furthermore, in this embodiment, three annular third convex portions 23 that make a round along the fitting surface are formed on the fitting surface 24 of the wire seal member 2 (FIGS. 4B and 4C). See).
The outer diameter of the annular third convex portion 23 is preferably formed to be slightly larger than the inner diameter of the cylindrical portion 12.
Thus, when the wire seal member 2 is fitted to the cylindrical portion 12 of the shield base member 1, the annular third convex portion 23 is crimped to the inner peripheral wall of the cylindrical portion 12, and the shield base member 1 and the wire seal member 2 and the shield base member 1 and the wire seal member 2 can be waterproofed.
In this embodiment, the shield base member 1 and the wire seal member are engaged by engaging the engagement protrusions 27 formed on the outer edge portion 25a of the auxiliary machine facing surface 25 with the seal fixing holes 15 of the shield base member 1. 2 is fixed.

It is a figure explaining the structure of the waterproof grommet by this invention. It is a figure which shows the shield base member and wire seal member which comprise a waterproof grommet. It is a figure explaining the waterproof grommet by the Example of this invention. It is a figure which shows a wire seal member. It is a figure explaining wiring of the cable for high voltages in an electric vehicle. It is a figure explaining the cable components by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield base member 11 Auxiliary machine grounding surface 12 Tube part 13 Auxiliary machine fixing hole 14 Wire seal grounding part 15 Seal fixing hole 2 Wire seal member 21 1st convex part 22 2nd convex part 23 3rd convex part 24 Fitting Surface 25 Auxiliary machine facing surface 26 Wire through hole 26a Opening 3 Shield 3a Shield end 4 Ferrule 5 Bolt 20 Cable 20a Cable terminal 110 Housing wall surface

Claims (3)

A waterproof grommet (10) comprising a shield base member (1) made of a conductive material and a wire seal member (2) made of an elastic insulating material,
The shield base member (1) includes an auxiliary machine ground plane (11) that is fixed to the casing wall surface (110) of the connected auxiliary machine and a cylindrical portion that is formed perpendicular to the auxiliary machine ground plane. (12)
The wire seal member (2) fitted in the cylinder part (12) is fitted on the fitting surface (24) closely contacting the inner peripheral wall of the cylinder part (12) and the housing wall surface (110) of the connection auxiliary machine. Auxiliary machine facing surface (25) facing each other, an annular first convex part (21) formed on the auxiliary machine opposing surface (25), and an opening (inside of the annular first convex part (21)) 26a) has a wire through hole (26) in which the wire is formed, and an annular second convex portion (22) formed along the inner peripheral wall of the wire through hole (26).
The end (3a) of the shield (3) that shields the noise of the cable is attached to the outer periphery of the cylindrical portion (12) of the shield base member (1), and the auxiliary machine ground plane (11) is connected to the housing of the connected auxiliary machine. Secure the shield ground connection by grounding and fixing to the body wall,
Furthermore, while crimping the 1st convex part (21) of the wire seal member (2) fitted in the said cylinder part (12) to the housing | casing wall surface (110) of a connection auxiliary machine, a 2nd convex part (22) is attached. A waterproof grommet characterized by waterproofing the cable terminal portion (20a) connected to the connection auxiliary machine by crimping to the cable (20) penetrating the electric wire through hole (26).   The annular third convex portion (23) formed along the fitting surface (24) of the wire seal member (2) is crimped to the inner peripheral wall of the cylindrical portion (12) of the shield base member (1), and The waterproof grommet according to claim 1, wherein a wire seal member (2) is fitted into the cylindrical portion (12).   The waterproof grommet according to claim 1 or 2, wherein the openings (26a) of the three electric wire through holes are arranged inside the annular first convex portion (21).

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