JP3611063B2 - Case internal / external connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal / external connection structure for a case in which, for example, electrical components arranged on the inside and outside of a case containing a liquid are connected by electric wires.
[0002]
[Prior art]
As this type of structure, one disclosed in Japanese Patent Publication No. 2-29654 is known. As shown in FIG. 5, the housing 2 is liquid-tightly fitted to the side wall of the case 1 via the rubber ring 3, and the electric wire 4 is inserted through the housing 2. However, in FIG. 5, the space on the right side of the side wall of the case 1 is a liquid storage space. However, with this alone, the liquid in the case 1 may leak from the gap between the electric wire 4 and the insertion hole 5, so a resin material injection chamber 6 is formed on the inner surface of the housing 2, and an epoxy material, for example, is formed here. 7 is injected to fill the gap between the electric wire 4 and the insertion hole 5. Further, if the electric wire 4 is a covered electric wire, the liquid in the case 1 may leak through the electric wire 4 due to capillary action, so that a part of the covering is peeled off in the resin material injection chamber 6. Therefore, the movement of the liquid due to the capillary phenomenon was prevented.
[0003]
On the other hand, when the epoxy material 7 is injected into the resin material injection chamber 6, it is necessary to position the electric wire 4 with respect to its length direction in order to ensure that the peeled core wire portion 8 is embedded in the epoxy material 7. There is. For this reason, the positioning material 9 is caulked to the peeled core wire portion 8 and the positioning material 9 is pressed against the bottom surface of the resin material injection chamber 6 to perform the injection work of the epoxy material 7.
[0004]
[Problems to be solved by the invention]
By the way, depending on the usage environment, other devices may be arranged around the housing. In that case, it is desirable to keep the housing from protruding as much as possible from the side wall of the case. Therefore, it is necessary to reduce the depth of the resin material injection chamber. The depth of the resin material injection chamber is set to a dimension at which at least the peeled core wire part can be embedded, and the dimension H is a sheath terminal of the electric wire 4 connected to the core wire part 8 as shown in FIG. It is determined from the distance A between 4a and 4b and the dimension B for guaranteeing liquid-proof property from the positional deviation and dimensional error of the electric wire 4. Here, the dimension B is a fixed value determined by the product standard such as the shape of the housing and the quality assurance level. Therefore, in order to reduce the depth of the resin material injection chamber 6 in terms of configuration, the distance B, that is, both sides of the core wire portion 8 is used. It must be performed by bringing the coated terminals 4a and 4b of the continuous electric wires 4 as close as possible. However, since the positioning fitting 9 is arranged coaxially with the electric wire 4 in the conventional configuration, the positioning fitting 9 may get in the way and get closer than that when the coated terminals 4a and 4b of the electric wire 4 are brought close to each other. could not. Therefore, in the conventional configuration, the distance A cannot be made smaller than the length dimension C of the positioning fitting 9, and the depth dimension H of the resin material injection chamber 6 is added to the dimension B plus the length dimension C of the positioning fitting 9. It could not be made smaller than the size.
[0005]
On the other hand, if the length C of the positioning fitting 9 is shortened, the coated terminals 4a and 4b of the electric wire 4 can be brought close to each other, so that the distance A is reduced and the depth of the resin material injection chamber 6 can be reduced. However, in this case, there is a drawback that it is difficult to perform the caulking operation of the positioning fitting 9.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a case internal / external connection structure that can reduce the size of the housing in a structure for connecting the inside and outside of the case with an electric wire. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the case internal / external connection structure of the present invention has a housing attached in a state of penetrating the side surface of the case, and the housing is formed with a filler injection chamber into which a filler is injected. In the internal / external connection structure of the case in which the covered electric wire connecting the electrical components arranged inside and outside the case is attached in a state of passing through the housing through the filler injection chamber, the covered electric wire in the filler injection chamber A part of the skin is peeled off to become a bracket fixing part, and a positioning bracket for positioning the length of the covered electric wire is fixed to the bracket fixing part by engaging with the housing, and the positioning bracket is fixed to the bracket. It has the characteristics that it is distribute | arranged so that it may not be located on the axis line of the covered wire | conductor connected to the both sides of a part (invention of Claim 1).
Moreover, you may set the length dimension of a positioning metal fitting longer than the distance between the coating | coated terminals connected to the both ends of a metal fitting fixed part (invention of Claim 2).
[0007]
[Operation and effect of the invention]
According to the first aspect of the invention, since the positioning fitting is fixed to the electric wire, the positioning of the electric wire in the length direction can be performed by engaging the positioning fitting with the housing. In addition, since the positioning fitting is disengaged from the axis of the electric wire connected to both sides of the fitting fixing portion, the covered terminals of the electric wires connected to both sides of the fitting fixing portion can be made as close as possible without being obstructed by the positioning fitting. Therefore, the depth of the resin material injection chamber can be reduced without being constrained by the positioning fitting, and the housing can be downsized.
According to the invention of claim 2, since the length dimension of the positioning fitting is set to be longer than the distance between the covering terminals connected to both ends of the fixing part, the covering terminals are connected as much as possible to reduce the size of the housing. Even if they are brought close to each other, it is possible to prevent the caulking work of the positioning metal fitting from becoming difficult.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment embodying the internal / external connection structure of the case of the present invention will be described with reference to FIGS.
The structure of the present embodiment is applied to a structure for connecting the inside and outside of a vehicle mission case.
[0009]
As shown in FIG. 1, a through hole 12 is formed in a side wall of a mission case 11 filled with oil, and a resin housing 13 is fitted therein. The housing 13 has a substantially central portion of the outer peripheral surface that is recessed over the entire periphery, and the opening edge of the through hole 12 is fitted into the recess 14. Also, a rubber ring mounting groove 15 is formed in the recess 14 over the entire circumference, and the rubber ring 16 is tightly inserted therein in a compressed state. That is, the housing 13 is oil-tightly fitted into the through hole 12 of the mission case 11.
[0010]
In the housing 13, a partition wall 17 is provided substantially at the center, and a resin material injection chamber 18 is formed in the upper portion of the housing 13 (right side in FIG. 1). An electric wire insertion hole 19 is formed in the substantially central portion of the partition wall 17 from the inside of the mission case 11 to the resin material injection chamber 18, and the electric parts arranged inside the mission case 11 and the outside are arranged there. The electric wire 20 which connects an electrical component is inserted. Moreover, the epoxy material 24 is inject | poured in the resin material injection | pouring chamber 18, and the circumference | surroundings of the electric wire 20 are hardened in the state which pulled in the electric wire 20 inside. As a result, the gap portion between the electric wire 20 and the electric wire insertion hole 19 is completely embedded, and oil leakage from the gap portion is prevented.
[0011]
The electric wire 20 has a wire diameter substantially equal to that of the electric wire insertion hole 19 and is configured by covering a core wire obtained by combining a plurality of strands with a vinyl material. The intermediate portion of the electric wire 20 is peeled off in the resin material injection chamber 18 and the core wire 21 is exposed, and the exposed core wire 21 is bent at a substantially right angle from one coated terminal 20a. After that, it is folded at a predetermined position and extends to the other covered terminal 20b. That is, in the resin material injection chamber 18, the core wire 21 is formed to protrude in a T shape with respect to the electric wire 20. The protruding core wire 21 portion is hereinafter referred to as a bracket fixing portion 22. In this way, part of the electric wire 20 is peeled off in the resin material injection chamber 18 and the core wire 21 is peeled off in order to strip the core wire 21 into which the epoxy material 24 injected into the resin material injection chamber 18 is more combined. This is because the oil that has penetrated and solidified and has penetrated into the electric wire 20 due to capillary action can be completely shut off here.
[0012]
A positioning fitting 23 for positioning the electric wire 20 in the length direction is caulked to the fitting fixing portion 22. That is, as shown in FIG. 2, the positioning fitting 23 is caulked and fixed in a direction orthogonal to the axis X of the electric wire 20, and is disposed at a position off the axis X of the electric wire 20. The positioning fitting 23 is pressed against the bottom surface of the resin material injection chamber 18 so that the electric wire 20 can be positioned in the length direction.
[0013]
Next, the procedure for assembling the electric wire 20 to the housing 13 will be described. First, a predetermined portion of the electric wire 20 is peeled off by a predetermined length, and the exposed core wire 21 is bent with respect to the electric wire 20 so as to have a T shape, thereby forming the above-described bracket fixing portion 22. Then, the positioning bracket 23 is caulked to the bracket fixing portion 22. Further, after that, the electric wire 20 is inserted into the electric wire insertion hole 19 of the housing 13 from the inside (right side in FIG. 1), and the positioning fitting 23 is made of resin at the end protruding to the opposite side (left side in FIG. 1). Pull until engaged with the bottom surface in the material injection chamber 18. Thereby, the electric wire 20 is positioned. When the epoxy material 24 is injected into the resin material injection chamber 18 until it is flush with the upper surface of the housing 13, the assembling work of the electric wire 20 is completed.
[0014]
Here, the depth H of the resin material injection chamber 18 needs to be large enough to embed the bracket fixing portion 22 as in the prior art, and it is provided on both sides of the bracket fixing portion 22 as shown in FIG. It is determined by the distance A between the coated terminals 20a and 20b of the continuous electric wire 20 and the dimension B which is a fixed value in the standard for assuring the oil resistance from a dimensional error or the like. However, in this embodiment, since the positioning fitting 23 is arranged at a position off the axis X of the electric wire 20 connected to the fitting fixing portion 22, the covering terminal 20a of the electric wire 20 without being obstructed by the positioning fitting 23, 20b can be brought close as much as possible, and the distance A can be made smaller than the length dimension C of the positioning fitting 23.
[0015]
Therefore, the depth of the resin material injection chamber 18 can be reduced as compared with the conventional configuration, and the housing 13 can be downsized. Moreover, since the injection amount of the epoxy material 24 can be reduced by reducing the depth of the resin material injection chamber 18, the cost can also be reduced. Furthermore, since the length dimension C of the positioning fitting 23 is set to be larger than the distance A between the covering terminals 20a and 20b, the positioning fitting can be used even if the covering terminals 20a and 20b are brought close to each other and the housing 13 is downsized. 23 does not become difficult to perform the caulking work.
[0016]
In addition, this invention is not limited to the said embodiment, For example, it can deform | transform and implement as follows, These embodiments also belong to the technical scope of this invention. (1) In the above embodiment, the metal fitting fixing part 22 protrudes in a T shape with respect to the electric wire 20, and the positioning metal fitting 23 is fixed thereto. Therefore, the positioning fitting 23 is fixed by caulking in a direction perpendicular to the axis X of the electric wire 20 and a position deviating from the axis X. However, as shown in FIG. 3, the peeled core wire (metal fitting fixing portion) 31 is bent 360 degrees so as to form a ring shape, and the positioning metal fitting 32 is caulked so as to be substantially parallel to the axis X of the electric wire 33. It may be a configuration.
[0017]
(2) Also, as shown in FIG. 4, the peeled core wire (fitting fixing part) 41 is bent into a clamp shape, and the positioning wires 42 are peeled off from both sides of the core wire 41. The structure may be caulked in a direction orthogonal to X1 and X2.
[0018]
(3) Further, the wire 43 and the wire 44 connected to both sides of the core wire 41 in FIG. 4 are not parallel, or the positioning fitting 23 is not in a direction orthogonal to the axis X of the wire 20 in FIG. In short, it is arranged at a position deviated from the axis of the electric wire connected to both sides of the core portion where the positioning fitting is peeled off, and the covered terminals can be brought closer without being restricted by the positioning fitting. If it is a thing.
[0019]
(4) In the above embodiment, the electric wire 20 is a single wire that extends from the inner side to the outer side of the mission case 11, and a predetermined part of the electric wire 20 is peeled to form the bracket fixing portion 22. Two wires with different wire diameters on the inside and outside, or two wires with different materials, are prepared, the ends of each wire are peeled off, and a caulking connection is made using a positioning fitting. .
[0020]
(5) In the above embodiment, the case inner / outer connection structure of the present invention is applied to the transmission case 11 in the vehicle. However, the present invention is required to have liquid tightness such as oil tightness and water tightness. Widely applied for structural ones.
In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the entirety of an embodiment.
FIG. 2 is an enlarged side view showing a caulking position of a positioning metal fitting.
FIG. 3 is an enlarged side view showing another embodiment (a configuration in which a peeled core portion has a ring shape).
FIG. 4 is an enlarged side view showing another embodiment (a configuration in which a peeled core wire portion has a clamp shape).
FIG. 5 is a cross-sectional view showing a conventional example.
FIG. 6 is an enlarged side view showing a caulking position of a conventional positioning fitting.
[Explanation of symbols]
11 ... Mission case
13 ... Housing 18 ... Resin material injection chamber (filler injection chamber)
20, 33, 43, 44 ... Electric wire (covered electric wire)
22: Bracket fixing part (metal fixing part)
21, 31, 41 .. core wire (fixed bracket part)
23, 32, 42 ... positioning bracket X, X1, X2 ... axis

Claims (2)

A housing is attached in a state of penetrating the side of the case, and a filler injection chamber into which a filler is injected is formed in the housing, and a covered electric wire for connecting electrical components arranged on the inside and outside of the case In the internal / external connection structure of the case attached in a state of penetrating the housing through the filler injection chamber,
A part of the covered electric wire in the filling material injection chamber is peeled off to form a metal fitting fixing portion, and the metal fitting fixing portion is positioned in the longitudinal direction of the covered electric wire by engaging with the housing. An internal / external connection structure for a case, in which a metal fitting is fixed and the positioning metal fitting is arranged so as not to be positioned on an axis of a covered electric wire connected to both sides of the metal fitting fixing portion. 2. The internal / external connection structure for a case according to claim 1, wherein a length dimension of the positioning metal fitting is set to be longer than a distance between covered terminals connected to both end portions of the metal fitting fixing portion.

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