JP2016181992A - Holding structure of splice of wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration of the housing section in an electric connection box for housing and holding a splice.SOLUTION: In a structure for housing and holding a splice 5 provided in a wiring harness, while applying a cap 15, in a housing cylinder 8 provided in an electric connection box, the housing cylinder is projected integrally, as a cylindrical body having an open lower surface and an upper surface closing wall, from the bottom wall of the resin case 6 of the electric connection box, and a rubber or resin holding member 10 having elasticity is previously inserted and held in place in the housing cylinder. The holding member is cylindrical and has a peripheral wall, the diameter of which increases from the head at the upper end toward the lower end opening, and press holds a pair of locking blades 10e, 10d, spreading downward from the opposite position to the peripheral edge of the head circumference of head, by projecting and pressing against the inner surface of a holding cylinder, and enhances the pressing force of the locking blades against the inner surface of the holding cylinder, by pushing in the splice applied with a cap from the lower end opening of the holding member in the housing cylinder, and expanding the upper part of the peripheral wall from which the locking blades are projecting.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure for holding a splice portion of a wire harness, and more specifically, a protective resin cap is placed on the splice portion (core wire connection portion of a plurality of electric wires) of the wire harness so that the inside of an electric connection box can be visually inspected. It is for holding and holding.

  As a connection portion between wires of a wire harness that is routed in a vehicle, there is a splice portion that connects resistance wires or ultrasonic welding the core wires that are peeled off and exposed at the end of the wire. When the splice part is accommodated in an electric connection box mounted on a vehicle, the splice part is held and held in a holding part provided in a case of the electric connection box.

  The applicant has provided an electrical junction box 100 shown in FIG. 4 in Japanese Patent Application Laid-Open No. 11-252747, assuming that a splice portion holding portion of this type of wire harness is provided in the electrical junction box. The electrical junction box 100 is integrally provided with a holding portion 103 formed of a cylindrical protruding portion upward from the bottom wall 102 of the case 101. A waterproof cover 202 is put on the electric wire connecting portion 201 formed of the terminal concentration splice portion of the wire harness 200 and is inserted from the lower surface opening 103 a of the holding portion 103. An opening 103c for appearance is provided in the center of the upper surface wall 103b of the holding portion 103 so that the waterproof cover 202 in the holding portion 103 can be visually confirmed through the opening 103c from above.

  The waterproof cover 202 that covers the wire connecting portion 201 is made of a synthetic rubber cap, and holds the outer surface of the waterproof cover 202 in elastic contact with the inner surface of the holding portion 103.

Japanese Patent Laid-Open No. 11-252747

  If the holding part 103 is integrally provided in the electric connection box 100, the electric wire connecting part 201 covered with the waterproof cover 202 can be held only by being inserted from below, and the holding state can be seen from above the case 101. There is an advantage that can be inspected. And since the holding | maintenance part 103 is a cylindrical shape which opened the lower surface and closed the upper wall, there exists an advantage which can integrally mold the case 101 with a metal mold | die easily.

  However, since the outer surface of the rubber waterproof cover 202 covering the electric wire connecting portion 201 is only elastically brought into contact with the inner surface of the holding portion 103 and is held in the holding portion 103, it is waterproofed from the holding portion 103 due to vehicle vibration or the like. There is a problem that the wire connecting portion 201 covered with the cover 202 is likely to fall off. However, if the electric wire connecting portion 201 and / or the waterproof cover locking portion is provided in the holding portion 103, an undercut is likely to occur, and a slide die is required as a mold, resulting in a high manufacturing cost.

  The present invention has been made in view of the above problems, and a wire connecting portion (splice portion) covered with a cap does not easily fall off while a simple cylindrical holding portion similar to Patent Document 1 is provided integrally with a case. The challenge is to do so.

In order to solve the above-described problems, the present invention provides a holding structure for a connecting portion of a wire harness in which a cap provided on a splice portion provided in a wire harness is received and held in a receiving tube provided in an electric connection box mounted on a vehicle. Because
The housing cylinder is integrally protruded as a cylindrical body having an upper surface closing wall at the lower surface opening from the bottom wall of the resin case of the electrical junction box, and provided with an appearance inspection hole in the upper surface closing wall,
An elastic rubber or resin holding member is inserted and held in advance in the housing cylinder, and the holding member has a cylindrical shape in which the peripheral wall expands downward from the upper end head toward the lower end opening. A pair of locking blades projecting downward from the opposing position of the peripheral edge of the portion, and press and hold the outer surface of the pair of locking blades and the lower outer peripheral surface of the peripheral wall against the inner surface of the holding cylinder And
The spliced portion covered with the cap is pushed from the lower end opening of the holding member in the accommodating cylinder, and the upper part of the peripheral wall projecting the locking blade is inflated, so that the engagement to the inner surface of the accommodating cylinder is performed. Provided is a structure for holding a splice portion of a wire harness that is configured to increase the pressing force of a vane portion.

As described above, the housing cylinder that is integrally formed with the case of the electrical junction box has a simple shape in which only a cylindrical body projects from the bottom wall of the case. This is not necessary and can prevent an increase in manufacturing cost. A separate holding member is inserted in advance into this simple-shaped receiving cylinder, and the holding member is pressed against the outer receiving cylinder and the inner cap-covering splice, respectively, so that the cap-covering splice is removed from the receiving cylinder. The holding force is applied to prevent the part from dropping off due to vehicle vibration.
When the cap covering splice is inserted into the holding member, the upper portion of the holding member expands in the direction orthogonal to the pair of locking blades. Whether or not is inserted can be reliably inspected.

The splice portion of the wire harness is provided in a wire group of the wire harness connected to the electrical junction box, and the splice portion is resistance-welded or ultrasonically welded or crimped to the core wires exposed from the ends of the plurality of wires. It is formed by crimping with a terminal.
Covering the splice part with the resin cap, the inner diameter of the cap is not more than the outer diameter of the splice part, and is spread and adhered during insertion, and the outer diameter of the cap is the insertion state of the splice part The inner diameter of the holding member is set to be equal to or larger than that, and the holding member is pressed against the housing cylinder.

  Note that a splice portion that is not covered with a cap may be inserted into the holding member that is inserted and held in advance in the housing cylinder. In addition, when being routed to other vehicle types, the cap is put on the splice part, and the process of covering the cap in the process of forming the splice part is often provided continuously. Insertion into a holding member that is held in advance in the housing cylinder increases.

  To the outer peripheral surface of the cap that covers the splicing portion and the locking force to the inner peripheral surface of the housing cylinder by providing fine irregularities on the outer peripheral surface and inner peripheral surface of the holding member or by applying a matte treatment to increase the friction coefficient The locking force may be increased.

  As described above, in the present invention, the housing cylinder integrally formed with the case of the electrical junction box has a simple shape in which a cylindrical body is protruded from the bottom wall of the case, and thus can be molded with the upper and lower molds. The slide mold is not necessary, and the manufacturing cost can be prevented from increasing. A separate holding member is inserted in advance into this simple-shaped receiving cylinder, and the holding member is pressed against the outer receiving cylinder and the inner cap-covering splice, respectively, so that the cap-covering splice is removed from the receiving cylinder. The holding force is applied to prevent the part from dropping off due to vehicle vibration. When the cap covering splice is inserted into the holding member, the upper portion of the holding member expands in the direction orthogonal to the pair of locking blades. Whether or not is inserted can be reliably inspected.

The relay box which accommodates and hold | maintains the splice part of embodiment of this invention is shown, (A) is a top view, (B) is the BB sectional drawing of (A), (C) is a principal part enlarged view. The holding member inserted in the accommodation cylinder of the said relay box is shown, (A) is a front view, (B) is a top view. The state which has inserted the splice part which covered the cap on the said holding member is shown, (A) is sectional drawing, (B) is a top view. It is a perspective view which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
In the embodiment, a terminal concentration splice portion 5 (hereinafter, abbreviated as a splice portion) provided in a plurality of wires 4 in a wire group constituting a wire harness 3 in an electric junction box including a relay box 1 mounted on an automobile. Holding and holding.

The case 6 of the relay box 1 is made of a resin molded product, and includes a peripheral wall 6a and a bottom wall 6b. A plurality of relay mounting portions 7 are integrally projected from the upper surface of the bottom wall 6b, and a housing cylinder that houses and holds a splice portion. 8 is integrally projected upward.
While the relay is inserted into the relay mounting portion 7, the relay connecting electric wire 2 constituting the wire harness 3 is inserted into the relay mounting portion 7 from below, and provided to some of the electric wires 4 constituting the wire harness 3. After the splice portion 5 is inserted and held in the receiving cylinder 8 from below, an upper cover and a lower cover (not shown) are joined to the case 6 and assembled.

  The housing cylinder 8 erected upward from the bottom wall 6b of the case is a cylindrical body, and a lower surface opening 8a for inserting the splice portion is provided at the position of the bottom wall 6b and the upper end is closed by the upper surface closing wall 8b. An appearance inspection hole 8c is provided in the center of the upper surface closing wall 8b. The vertical length of the housing cylinder 8 is substantially equal to the vertical length of the splice portion 5 of the wire harness.

  An elastic rubber or resin holding member 10 is inserted and held in advance in the housing cylinder 8 of the case. The holding member 10 is a flexible tube body having a head 10a at one end of the peripheral wall 10b and an insertion opening 10h at the lower end. The holding member 10 has a cylindrical shape in which the peripheral wall 10b expands downward from the upper end head portion 10a toward the lower end opening. When pressed against the inner surface along the lower surface opening 8a, the head portion 10a has a length positioned with a gap in the upper surface closing wall 8b, and the outer diameter of the head portion 10a is equivalent to the appearance inspection hole 8c.

A pair of locking blade portions 10d and 10e are provided so as to protrude downward from the opposing position of the periphery of the head 10a of the holding member 10. The locking blade portions 10d and 10e are curved so that the central portion in the length direction is curved outward, and the curved portions are pressed against the inner surface of the housing cylinder 8 to be in pressure contact.
In this manner, the locking blade portions 10d and 10e at the upper part of the peripheral wall 10b of the holding member 10 are pressed against the inner peripheral surface 8i of the housing cylinder 8, and the entire periphery of the lower end 10c of the peripheral wall is pressed against the inner peripheral surface 8i of the storage cylinder 8. Thus, the separate holding member 10 is firmly held only by being inserted into the housing cylinder 8 formed integrally with the case from below.

  The splicing portion 5 provided at the ends of the plurality of electric wires 4 constituting the wire harness 3 from the insertion opening 10h is inserted into the holding member 10 by covering the holding member 10 with a flexible resin cap 15. Hold on. The cap 15 is provided with a head portion 15b at one end of a cylindrical peripheral wall 15a and an insertion opening 15c at the other end. The length of the cap 15 is substantially equal to the length of the holding member 10.

  The splice portion 5 peels off the insulation coating of the ends of the plurality of electric wires 4 to expose the core wires 4a, and the core wires 4a are resistance-welded to form splice portions including concentrated weld portions 4e, and a plurality of splice portions are formed. The electric wire 4 is converged in a circular cross section. The outer diameter of the splice portion 5 is slightly larger than the inner diameter of the peripheral wall of the cap 15, and the splice portion 5 is pushed into the cap 15 so that the splice portion 5 does not fall by its own weight from the cap 15. Note that a tape winding piece may protrude from a part of the periphery of the insertion opening 15 c of the cap 15, and an adhesive tape may be wound around the electric wire of the splice portion 5 and fixed.

  In a state where the cap 15 is put on and fixed to the splice portion 5, the flexible cap 15 swells, and the outer periphery thereof is set to about −0.5 mm from the inner diameter of the housing cylinder 8, toward the inner circumferential surface of the housing cylinder 8. The holding member 10 is pressed against the peripheral wall 10b with a strong force.

The operation of accommodating the splice portion 5 of the wire harness 4 in the relay box 1 is performed by holding the splice portion 5 covered with the cap 15 in the holding member 10 that is inserted and held in advance in the accommodating cylinder 8 of the relay box 1. It is only pushed upward through the lower surface opening 8a and the insertion opening 10h.
In this pushing operation, as shown in FIG. 3 (A), the peripheral wall 10b of the holding member 10 whose diameter is expanded downward swells to have the same upper and lower diameters, and the upper retaining blade portions 10d and 10e are accommodated in the housing cylinder. Press firmly against the inner surface of 8. And the peripheral wall 10b of the orthogonal direction which does not provide the latching blade | wing parts 10d and 10e is expanded outward, and it will be in the state shown to FIG. 3 (B). Thereby, the upper surface shape of the holding member 10 that can be seen from the upper appearance inspection hole 8c is changed from the state shown in FIG. 2B to the state shown in FIG. Therefore, in the state of FIG. 3B, it can be confirmed that the splice portion 5 is accommodated and held in the accommodating cylinder 8.

With the above configuration, the housing cylinder 8 provided integrally with the case 6 in the electrical junction box composed of the relay box 1 has a simple shape in which a cylindrical body projects from the bottom wall of the case 6. Can be molded with upper and lower molds, slide molds are not necessary, and manufacturing costs can be prevented from rising.
By simply inserting the splice portion 5 covered with the cap 15 into the housing cylinder 8 having a simple shape, the configuration becomes the same as that of the Patent Document 1, and the splice portion 5 may fall off the housing tube 8 due to vehicle vibration or the like. There is.
In the present invention, the holding member 10 having elasticity is pushed into the housing cylinder 8, the upper locking blade portions 10 d and 10 e and the lower peripheral edge of the peripheral wall 10 b are pressed against the inner peripheral surface of the housing cylinder 8, and the cap 15 is put on. The spliced portion 5 is pushed into the holding member 10 to expand the peripheral wall 10b in the outer diameter direction, and the pressing force of the locking blade portions 10d and 10e and the peripheral wall 10b against the inner peripheral surface of the housing cylinder 8 is reinforced. In this manner, the holding member 10 is inserted and held in advance in the simple-shaped housing cylinder 8 and the cap-covering splice portion is pushed into the holding member 10, so that the holding member 10 and the cap coating are more strongly attached to the housing cylinder 8. Since the splice is pressed, it can be reliably prevented from falling off due to vibration or the like.

  Furthermore, since the holding member 10 is formed of elastic rubber or resin and has flexibility, even if the sizes of the splice portion 5 and the cap 15 to be covered are slightly different, the holding cylinder 8 is deformed by the deformation of the holding member 10. Can be securely held inside.

The present invention is not limited to the above-described embodiment, and the splice portion provided on the electric wire of the wire harness may be formed by ultrasonic welding, or a plurality of core wires are crimped using a crimped crimp terminal provided with a barrel. A part may be formed.
Further, when the size of the holding splice part is large and the housing cylinder 8 and the holding member 10 are large, three locking blade parts protruding from the peripheral wall of the holding member 10 are spaced 120 degrees apart, or 90 You may provide four pieces at intervals.

  Furthermore, fine irregularities are provided on the inner peripheral surface and the outer peripheral surface of the peripheral wall 10b of the holding member 10, or a matte treatment is performed to increase the coefficient of friction, and the outer peripheral surface of the peripheral wall 10b of the holding member 10 and the inner peripheral surface of the receiving cylinder 8; The fixing force between the inner peripheral surface of the peripheral wall 10b of the holding member 10 and the outer peripheral surface of the cap 15 may be increased.

DESCRIPTION OF SYMBOLS 1 Relay box 3 Wire harness 4 Electric wire 5 Splice part 6 Case 8 Housing cylinder 8c Visual inspection hole 10 Holding member 10d, 10e Locking blade part 15 Cap

Claims (1)

A holding structure of a connecting portion of a wire harness for storing and holding a cap on a splice portion provided in a wire harness in a receiving cylinder provided in an electric connection box mounted on a vehicle,
The housing cylinder is integrally protruded as a cylindrical body having an upper surface closing wall at the lower surface opening from the bottom wall of the resin case of the electrical junction box, and provided with an appearance inspection hole in the upper surface closing wall,
An elastic rubber or resin holding member is inserted and held in advance in the housing cylinder, and the holding member has a cylindrical shape in which the peripheral wall expands downward from the upper end head toward the lower end opening. A pair of locking blades projecting downward from the opposing position of the peripheral edge of the portion, and press and hold the outer surface of the pair of locking blades and the lower outer peripheral surface of the peripheral wall against the inner surface of the holding cylinder And
The spliced portion covered with the cap is pushed from the lower end opening of the holding member in the accommodating cylinder, and the upper part of the peripheral wall projecting the locking blade is inflated, so that the engagement to the inner surface of the accommodating cylinder is performed. A structure for holding a splice portion of a wire harness that is configured to increase the pressing force of a stationary blade portion.

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