JPH06223900A - Leading out structure of lead wire from inside of liquid container - Google Patents

Abstract

PURPOSE:To obtain the leading out structure of a lead wire, with which the leak of the filling material is prevented without making any change of a design even if some change of the diameter of the lead wire is required and with which the inserting work of the lead wire is facilitated. CONSTITUTION:The insertion hole 42 of a lead wire is formed as the inner hole of a taper cylindrical body 44, which is projected in the direction for separating from a housing recessed part 15 to be filled with the filling material 17 and whose diameter is reduced more as it comes closer to the tip thereof. The peripheral surface of this taper cylindrical body 44 is also provided with plural slits 46, extended from the tip edge to the base end side, in the circumferential direction at equal intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead wire lead-out structure for leading out wire harnesses for solenoid operation and lead wires of various sensors from a liquid container such as a vehicle transmission case.

[0002]

2. Description of the Related Art As a conventional example of this type of structure, the actual construction of Shokai 61
The one described in JP-A-107165 is known.

In this structure, as shown in FIG. 10, the lead wire holding member 5 is liquid-tightly fixed to the lead wire lead-out hole 3 formed in the wall 1 of the liquid container, and the lead wire formed in the lead wire holding member 5 is fixed. A lead wire 9 composed of a plurality of core wires and an insulating coating is inserted into the insertion hole 7, and an insulating coating peeling portion 11 is provided in the middle of the lead wire 9 adjacent to the insertion portion.
The crimping metal fitting 13 is caulked, and the crimping metal fitting 13 is positioned in the accommodating recess 15 formed in the lead wire holding member 5 and the accommodating recess 15 is filled with the filler 17, as shown in FIG. Is.

The lead wire 9 is provided with the insulating coating peeling portion 11 and is molded with the filling material 17 to form the lead wire 9.
This is to prevent the oil from leaking from the liquid container through the action of the capillary phenomenon between the core wires. In this case, since the filler 17 has to enter the slight gap between the core wires, an epoxy resin having a low viscosity is mainly used as the filler 17.

In this conventional example, the crimp fitting 13 is provided for connecting the inner and outer lead wires, but in addition to this, the positioning of the lead wire 9 in the longitudinal direction is performed by this. Therefore, the crimping metal fitting 1 is not attached to the middle stripped portion (the portion where the core wire is exposed by stripping the insulating coating in the middle of the lead wire) for the purpose of positioning only, not for connecting the inner and outer lead wires.
3 may be provided. If the positioning accuracy of the crimp fitting 13 is poor in the state where it is solidified with the filling material 17, the lead wire 9 may not be connected to another device.
This positioning needs to be performed accurately.

FIG. 12 shows another conventional example. This example also has basically the same structure as the above-mentioned conventional example, but the insertion hole 27 is formed as an inner hole of a cylindrical body 29 protruding in a direction away from the accommodation recess 15. Others have the same function, so
The same functional parts are designated by the same reference numerals and the description thereof will be omitted.

Further, Japanese Patent Laid-Open No. 3-37975 discloses that
As shown in FIG. 13, there is shown a structural example in which the insertion hole 30 of the lead wire 9 and the housing recess 32 of the crimp fitting 13 are formed in the elastic member 34.

[0008]

By the way, as described above, a filler having a low viscosity is used because it is necessary to penetrate the filler into a slight gap between the core wires. Therefore, if the gap between the insertion hole and the lead wire is large, there is a problem that the filler leaks out through the gap.

If this gap is too small, it becomes difficult for the lead wire to be inserted. Therefore, the diameter of the insertion hole is set for the lead wire so that an appropriate gap size can be secured.

However, the design of the size of the insertion hole has to be changed every time the diameter of the lead wire changes, which is very troublesome.

FIG. 14 shows the results of an experiment in which the state of leakage of the filler was investigated when the gap between the lead wire and the insertion hole was made different. The degree of leakage is A (no leakage at all), B (filler material has come out to the hole end of the insertion hole), C (filler material has slightly leaked from the hole end of the insertion hole), D (hole end) 2) or more) and E (flicker-like filler leaked from the hole end) were divided into 5 stages, and the number of occurrences was sampled. The results shown in the figure were obtained. Among these, since the A rank and the B rank pass without any problem, it can be understood that the clearance is up to about 0.2 mm as the allowable limit.

As described above, since leakage of the filling material increases even if the gap size is slightly increased, it is necessary to strictly control the gap size. Therefore, the lead wire needs to be changed depending on the diameter of the lead wire. The design of the holding member had to be changed.

Further, in the case where the insertion hole and the accommodating recess are formed in the elastic member as in the technique of Japanese Patent Laid-Open No. 3-37975, there is no fear of leakage of the filling material, but on the other hand, the lead wire to the insertion hole is eliminated. There was a problem that it was difficult to insert.

In consideration of the above circumstances, the present invention can prevent the leakage of the filling material without changing the design even if the diameter of the lead wire is slightly changed, and the lead wire insertion work can be performed. It is an object of the present invention to provide a lead wire derivation structure that can be easily performed.

[0015]

According to the present invention, a lead wire holding member is liquid-tightly fixed in a lead wire lead-out hole formed in a wall of a liquid container, and a plurality of core wires are inserted in insertion holes formed in the lead wire holding member. A lead wire consisting of an insulating coating and an insulating coating is inserted, an insulating coating peeling portion is provided on the lead wire adjacent to the insertion portion, a crimping metal fitting is crimped to the insulating coating peeling portion, and the crimping metal fitting is attached to the lead wire holding member. In a lead wire lead-out structure from a liquid container which is positioned in the formed housing recess and is filled with a filling material in the housing recess, a lead wire insertion hole is projected in a direction away from the housing recess, and a tip is provided. It is characterized in that it is formed as an inner hole of a taper cylindrical body that decreases in diameter as it goes to, and a plurality of slits extending from the leading edge to the base end side are formed at equal intervals in the circumferential direction on the peripheral wall of the taper cylindrical body. .

[0016]

In the lead wire lead-out structure having the above structure, the insertion hole is formed as the inner hole of the tapered cylindrical body, and the peripheral wall is formed with a plurality of slits. The degree of opening changes to allow the lead wire to be inserted. At this time, since the diameter of the tapered cylindrical body is reduced toward the tip, the insertion resistance does not become excessive and the gap between the lead wire does not become excessive regardless of the diameter of the lead wire. If the diameter of the lead wire is large, the slit will be wide open, but the gap between the inner circumference of the insertion hole and the outer circumference of the lead wire will be reduced accordingly. Will fit in. In addition, since the insertion hole is tapered and tapered, the filling material does not easily leak regardless of the size of the gap.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the lead wire lead-out structure of the embodiment, FIG. 2 is an enlarged view of a main part thereof, FIG. 3 is a perspective view of a lead wire holding member, and FIG. 4 is a front view of the lead wire holding member. .

In this embodiment, the insertion hole 42 of the lead wire 9 provided in the lead wire holding member 40 projects in the direction away from the accommodating recess 15 and has a tapered cylindrical body 44 whose diameter decreases toward the tip.
It is formed as an inner hole of. Moreover, a plurality of slits 46 extending from the front end edge toward the base end side are formed on the peripheral wall of the tapered cylindrical body 44 at equal intervals in the circumferential direction. Other than that, Fig. 1
Since it has the same configuration as the conventional example of No. 2, the same reference numerals are given to the same components and the description thereof will be omitted.

To obtain this lead wire lead-out structure, the lead wire 9 is inserted into the insertion hole 42 from the accommodation recess 15 side. Then, the slit 46 is opened and the peripheral wall of the tapered cylindrical body 44 is bent, thereby absorbing the difference in diameter of the lead wire 9 and allowing the lead wire 9 to be easily inserted. At this time, although the slit 46 is opened, the gap as a whole falls within a certain range, so that leakage of the filler 17 injected later is prevented.

Next, the relationship between the slit 46 and the gap will be described.

The taper cylinder 44 having the slit 46 shown in FIGS. 5, 6 and 7 is subjected to force F by passing a lead wire.
Opens from the center to the outside and becomes the following relationship. Here, φA is the hole diameter when the slit is closed, φB is the hole diameter when the diameter is expanded by passing the lead wire, and α is the overlap amount of the lead wire corresponding to the displacement amount when the diameter is expanded.

ΦB = φA + α Next, the relation of the gap is shown as follows.
It is as follows.

First, the gap between the lead wire and the insertion hole is represented by the absolute value of α. Further, when the displacement amount of the slit is represented by Δt, the gap t of the slit is t = t1 + Δt. t1 is a gap in the initial state.

When the lead wire diameter is larger than φB, the value of Δt is about COSθ × (absolute value of α) / 2 × 2 = (absolute value of α) ×
It is expressed as COSθ. Here, θ is an angle determined by the number of slits.

FIG. 8 and FIG. 9 show the relationship between the value of Δt and the (absolute value of α) based on this. Figure 8 shows 4
When the slit is provided so as to divide, FIG. 9 shows the case where the slit is provided so as to divide the peripheral wall into eight. From these tables, (absolute value of α) <Δt can be proved. That is, it can be seen that the tapered tubular body is formed, and the more slits there are, the more difficult it is to form a gap. As a result, the following conclusions will be drawn when comparing the case of using the above-mentioned 8-division taper cylinder and the case of using the conventional straight hole.

That is, in the conventional product, assuming that the hole diameter is φA, the range from the lead wire diameter (φA-0.3) to φA can be used, and the width of the range is 0.3 mm, but it is divided into eight. In this embodiment, the hole diameter is φA and the initial gap value t1
= 0.1, the maximum value Δt of Δt + t1 ≦ 0.3 can be set to 0.191. Since the absolute value of α corresponding to this is 0.5 from the table of FIG. 9, the lead wire diameter (φA−
A range of 0.3) to (φA + 0.5) can be used.
In other words, the corresponding wire change width is 0.8, and the range of lead wire diameters used is wider than in conventional products.

[0028]

As described above, according to the present invention,
Even if the diameter of the lead wire is slightly changed, the gap through which the filler leaks can be set within a certain range, and the leakage of the filler can be prevented. Therefore, it is not necessary to redesign the diameter of the insertion hole according to the change in the diameter of the lead wire, and the range of the diameter of the lead wire that can be used is expanded. Further, since the opening degree of the slit is changed according to the diameter of the lead wire and the insertion resistance is adjusted, the insertion workability does not deteriorate regardless of the diameter of the lead wire.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part of an embodiment of the present invention.

FIG. 3 is a perspective view of a lead wire holding member according to an embodiment of the present invention.

FIG. 4 is a front view of a lead wire holding member according to an embodiment of the present invention.

FIG. 5 is a front view of the taper cylinder for explaining the operation of the taper cylinder in the embodiment of the present invention.

FIG. 6 is a front view of the tapered cylindrical body in another state for explaining the operation of the tapered cylindrical body in the embodiment of the present invention.

FIG. 7 is a side view of the taper cylinder for explaining the operation of the taper cylinder in the embodiment of the present invention.

FIG. 8 is a diagram for explaining the operation of the tapered cylindrical body in the embodiment of the present invention.

FIG. 9 is another table for explaining the operation of the tapered cylinder in the embodiment of the present invention.

FIG. 10 is a side sectional view showing a conventional lead wire lead-out structure.

11 is a cross-sectional view showing the main parts of FIG.

FIG. 12 is a side sectional view showing another conventional lead wire lead-out structure.

FIG. 13 is a side sectional view showing still another conventional lead wire lead-out structure.

FIG. 14 is a graph showing the results of examining the leakage occurrence state of the filler due to the gap between the lead wire insertion hole and the lead wire, which is a problem here.

[Explanation of symbols]

 1 Wall of Liquid Container 3 Lead Wire Derivation Hole 9 Lead Wire 11 Insulation Coating Peeling Part 13 Crimping Metal Fitting 17 Filling Material 40 Lead Wire Holding Member 42 Insertion Hole 44 Tapered Cylindrical Body 46 Slit

Claims (1)

[Claims] 1. A lead wire holding member is liquid-tightly fixed to a lead wire lead-out hole formed in a wall of a liquid container, and a lead wire composed of a plurality of core wires and an insulating coating is provided in an insertion hole formed in the lead wire holding member. Through, the insulating wire peeling portion is provided on the lead wire adjacent to the insertion portion, the crimping metal fitting is crimped to the insulating wire peeling portion, and the crimping metal fitting is positioned in the accommodating recess formed in the lead wire holding member. In a lead wire lead-out structure from a liquid container in which a filling material is filled in the accommodating recess, a taper tube that projects the insertion hole of the lead wire in a direction away from the accommodating recess and reduces the diameter toward the tip. The lead wire from the inside of the liquid container is characterized in that it is formed as an inner hole of the body and a plurality of slits extending from the front end edge to the base end side are formed on the peripheral wall of the tapered cylindrical body at equal intervals in the circumferential direction. Derived structure.