JP2003111245A - Waterproof structure for cable insertion opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof structure for a cable insertion opening capable of preventing the entry of liquid such as water to the inside or the like of a cable. SOLUTION: A cylindrical part 11a of a cable insertion molded body 11 integrally molded of a material having elasticity or flexibility is tightly inserted in the cable insertion opening. A flange 11b, which is integrally molded to the base board of the cylindrical part 11a and brought into contact with the external surface of a case, is sandwiched between a first case 3 and a second case 7. In the opening 11c sided to the flange 11b of the cylindrical part 11a, a plurality of fins 11e are provided, each of which is supported at its one side by the marginal part 11d of the opening 11c and is arranged along the marginal part 11d. A seal material 13a, which is charged in the cylindrical part 11a of the cable insertion molded body 11 from the opening 11c in the reverse side of the flange 11b of the cylindrical part, is cured and forms a sealing part 13 in the cylindrical part 11a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a cable insertion port that prevents a liquid such as water from entering a case such as a terminal box.

[0002]

2. Description of the Related Art A cable having a connecting member such as a connector attached to its tip is inserted into the case from the tip of the cable through a cable insertion opening formed in a wall of the case. The size of the insertion port is set so that a connecting member such as a connector attached to the cable can be inserted.

[0003]

However, since the size of the connecting member such as the connector attached to the cable is usually larger than the diameter of the cable, the cable attached with the connecting member such as the connector is placed inside the case. After the insertion, a gap is formed between the cable and the inner wall surface of the cable insertion port. Therefore, there is a problem that liquid such as water enters the inside of the case through the gap formed between the cable and the inner wall surface of the cable insertion port.

It is an object of the present invention to provide a waterproof structure for a cable insertion port which can prevent a liquid such as water from entering the inside of a case or the like.

[0005]

A waterproof structure for a cable insertion port, which is an object of improvement of the present invention, is a cable insertion port in which a cable having a connecting member such as a connector attached to a tip thereof is formed on a wall portion of a case. In the cable insertion structure part inserted from the tip of the cable into the inside of the case through, a liquid such as water is prevented from entering the inside of the case from the cable insertion structure part.

In the present invention, the cable insertion structure is provided with the cable insertion molded body fitted to the cable insertion port. This cable insertion molded body is integrally molded with a material having elasticity or flexibility, and is tightly inserted into the cable insertion port, and is integrally provided at the base of the cylindrical portion to contact the outer surface of the case. Flange part to
A plurality of fins are provided, one side of which is supported by an edge portion of the opening portion near the flange portion of the cylindrical portion and arranged along the edge portion of the opening portion. Then, the molded body for cable insertion has an outer peripheral surface of the cable with the plurality of fins inclined to the tip side of the cable with the tip of the cable being inserted into the opening from the flange side and drawn into the case. Is in contact with. In the molded body for cable insertion, the sealing material filled from the opening portion on the side opposite to the flange portion of the tubular portion cures to form a seal portion inside the tubular portion.

According to this structure, the plurality of fins inclined toward the tip side of the cable function as a stopper of the sealing material and a part of the waterproof member. Therefore, the sealing material with which the tubular portion is filled accumulates on the plurality of fins to reliably form the sealing portion. As a result, according to the present invention, the plurality of fins and the seal portion can surely close the gap formed between the cable and the cable insertion port, and prevent the liquid from entering the case. .

Further, in the above-mentioned molded body for inserting a cable, the cross-sectional shape of the tubular portion is determined so that the connecting member provided at the tip of the cable can pass through the tubular portion. The cross-sectional shape of the tubular portion is determined in this manner so that the connecting member having a size larger than the diameter of the cable can be inserted into the case while being attached to the tip of the cable.

Further, the plurality of fins of the above-mentioned molded body for cable insertion substantially closes the opening of the tubular portion on the side of the flange portion when the cable is not present inside the tubular portion. By substantially closing the opening of the tubular portion on the flange side in this way, when forming a plurality of fins when forming a cable insertion molded body, the plurality of fins should be the largest possible. It is possible to maximize the area of the fin that contacts the outer peripheral surface of the cable. Therefore, the slit formed between two adjacent fins can be made as small as possible, and the function of the fin as a stopper for the sealing material can be maximized.

An annular wall portion may be integrally formed on the outer wall surface of the case so as to surround the cable insertion port. A flange portion of the molded body for cable insertion is fitted in the annular wall portion. If the thickness of the flange when uncompressed is made larger than the height of the annular wall, the flange will be in contact with another case in a compressed state to exert a waterproof function on the flange as well. be able to.

As a sealing material filled from the opening of the tubular portion of the molded body for cable insertion, it is externally passed through a slit formed between two adjacent fins of a plurality of fins in contact with the outer surface of the cable. It is preferable to use one having a viscosity that does not leak. By setting the viscosity of the sealing material in this way, the slits formed between two adjacent fins of the plurality of fins can be reliably closed with the sealing material.

When the present invention is applied to waterproof the cable insertion portion between the first device and the second device, it is as follows. First, the target of application is a first device in which a cable having a connecting member such as a connector attached to its tip is provided in the first case and is pulled out from the cable outlet to the outside of the first case, A second device attached to the first case of the first device and having a second case having a cable insertion port into which the cable is inserted from the tip to the inside; From the device side to the inside of the second case of the second device through the cable insertion port provided in the case to prevent the liquid that has infiltrated between the first case and the second case from entering. It has a waterproof structure.

Also in this case, the cylindrical portion integrally formed of a material having elasticity or flexibility and tightly inserted into the cable insertion port, and integrally provided on the base portion of the cylindrical portion are provided.
The flange portion sandwiched between the outer surface of the case and the outer surface of the second case, and one side is supported by the edge portion of the opening portion near the flange portion of the tubular portion and arranged along the edge portion of the opening portion. A molded body for cable insertion having a plurality of fins is used.
Then, with the tip of the cable inserted into the opening from the flange side and drawn into the case, the plurality of fins are in contact with the outer peripheral surface of the cable in a state of being inclined toward the tip side of the cable. Further, the sealing material filled from the opening on the side opposite to the flange portion of the tubular portion is hardened to form a seal portion inside the tubular portion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a waterproof structure for a cable insertion opening of the present invention. 2A is a plan view of an example of a cable insertion molded body used in the present embodiment.
2B is a cross-sectional view taken along the line AA of FIG. In these figures, the cable 1 is a sheath cable in which motor power lines and encoder cables are bundled. A connecting member 2 such as a connector having a size larger than the diameter of the cable 1 is attached to the tip 1a of the cable 1. The first case 3 is a bracket or an encoder cover, and is a case of the first device 5. The first case 3 has a cable outlet 3a for pulling out the cable 1 from the inside of the first case 3. The shape of the cable outlet 3a is set to a size such that the cable 1 and the connecting member 2 attached to the cable 1 can be pulled out.

On the other hand, the second case 7 is a case of a terminal box as the second device 9. In the second case 7, the first
A cable insertion port 7a which is attached to the first case 3 of the device 5 and into which the cable 1 is inserted from the tip 1a is provided. The shape and dimensions of the cable insertion port 7a are set so that the tubular portion 11a of the cable insertion molded body 11 is tightly fitted.

The cable insertion molding 11 is integrally molded of a material having elasticity or flexibility. Examples of the material having elasticity or flexibility include rubber and thermoplastic resin. In this example, the cable insertion molding 11 is made of rubber. The cable insertion molded body 11 includes a tubular portion 11a, a flange portion 11b, and a plurality of fins 13e. The tubular portion 11a is tightly inserted into the material cable insertion port 7a. The flange portion 11b is integrally provided on the base portion of the tubular portion 11a and is sandwiched between the outer surface of the first case 3 and the outer surface of the second case 7. One side of the plurality of fins 11e is supported by the edge 11d of the opening 11c near the flange 11b of the tubular portion 11a, and the fins 11e are arranged along the edge 11d of the opening 11c. In the embodiment of the present invention, the six fins 11 are provided.
e. The number of fins can be appropriately determined according to the diameter of the cable 1 and the size or shape of the connecting member attached to the cable 1.

When the tip of the cable 1 is inserted into the opening 11c from the side of the flange 11b and pulled into the case, the six fins 11e are inclined toward the tip of the cable 1 and the outer periphery of the cable 1 is extended. It is in contact with the surface 1a.

In the embodiment of the present invention, the tubular section 11a has a substantially elliptical cross-sectional shape, but the connecting member 2 provided at the tip of the cable 1 is the tubular section 1.
The shape may be circular or rectangular as long as it can pass through the inside of 1a, and the cross-sectional shape of the tubular portion 11a can be freely determined according to the shape of the connecting member 2.

The plurality of fins 11e substantially close the opening of the tubular portion 11a on the flange portion 11b side when the cable 1 is not present inside the tubular portion 11a. This is because six fins are formed by forming a plurality of slits (cuts) in the closing plate so as to close the opening of the tubular portion 11a.

On the outer wall surface 7b of the second case 7,
An annular wall portion 7c is integrally formed so as to surround the cable insertion port. The flange portion 11b of the cable insertion molded body 11 is fitted in the annular wall portion 7c, and the outer surface 3b of the first case 3 is in contact with the end surface of the annular wall portion 7c. The thickness of the flange portion 11b before connecting the first case and the second case is the same as that of the annular wall portion 7.
It is larger than the height dimension of c. Therefore, the flange portion 11b is compressed in the thickness direction when the first case and the second case are combined. As a result, the flange also has a sealing function (function as packing).

The seal portion 13 is formed inside the tubular portion 13a by filling and hardening the sealing material from the opening 13c on the opposite side of the flange portion 13b of the tubular portion 13a. In the embodiment of the present invention, as a sealing material with which the opening 13c is filled, leakage occurs to the outside through a slit 11f formed between two adjacent fins of a plurality of fins 11e in a state of being in contact with the outer surface of the cable 1. A silicon resin having a viscosity that does not come out is used.

The plurality of screws 15 are a plurality of male screws.
The plurality of screws 15 include the second case 7 and the flange portion 11.
It penetrates through b and is screwed into a female screw portion provided in the first case 3. As a result, the second case 7 and the first case 3 are joined together. The annular wall portion 7c also functions as a stopper for preventing the flange portion from being compressed more than necessary due to over-tightening of the plurality of male screws 15.

[0023]

According to the waterproof structure of the cable insertion port of the present invention, since the plurality of fins contacting the outer peripheral surface of the cable and the seal portion filled with the seal material are provided,
It is possible to prevent a liquid such as water from entering the inside of the case through the cable insertion port of the case where the cable is inserted.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an example of an embodiment of a waterproof structure for a cable insertion opening of the present invention.

FIG. 2A is a plan view of the cable insertion molded body of the present invention, and FIG. 2B is a front sectional view of the cable insertion molded body of the present invention.

[Explanation of symbols]

1 cable 1a Cable tip 1b Cable outer peripheral surface 2 Connection member 3 first case 3a Cable outlet 3b Outer surface of first case 5 First equipment 7 Second case 7a Cable insertion port 7b outer wall 7c Ring wall 9 Second equipment 11 Molded body for cable insertion 11a tube 11b Flange part 11c opening 11d Edge of opening 11e Multiple fins 11f slit 13 Seal part 13a Seal material 15 multiple screws

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhito Yamaura             1-15-1 Kitaotsuka, Toshima-ku, Tokyo Sanyo             Electric Co., Ltd. F-term (reference) 4E352 AA06 AA16 BB02 CC02 CC12                       CC33 CC36 CC52 CC56 DD04                       DD05 DD11 DR02 DR13 DR25                       DR26 DR39 DR40 GG04                 5G361 AA06 AB09 AC01 AC11 AE01                 5G363 AA01 BA02 CA05 CA14 CB08                       DC02

Claims (9)

[Claims] 1. A cable insertion structure portion in which a cable having a connecting member such as a connector attached to a tip is inserted into the case from the tip through a cable insertion opening formed in a wall of the case, A waterproof structure of a cable insertion opening for preventing liquid such as water from entering from the cable insertion structure into the inside of the case, wherein the cable insertion structure is a cable insertion member attached to the cable insertion opening. A molded body for cable insertion, wherein the molded body for cable insertion is integrally molded with a material having elasticity or flexibility, and a tubular portion tightly inserted into the cable insertion port, and a base portion of the tubular portion. A flange portion provided integrally and in contact with the outer surface of the case, and one edge supported by an edge portion of the opening portion of the tubular portion near the flange portion, and the edge portion of the opening portion. Along and a plurality of fins disposed in the state in which the leading end is drawn into the inserted and the casing to the opening portion from the flange portion side of the cable,
The plurality of fins are in contact with the outer peripheral surface of the cable in a state of being inclined toward the tip side of the cable, and the sealing material filled from the opening on the side opposite to the flange portion of the tubular portion is cured. A waterproof structure for the cable insertion port is characterized in that a seal portion is formed inside the tubular portion. 2. The waterproof structure for a cable insertion port according to claim 1, wherein a cross-sectional shape of the tubular portion is determined such that a connecting member provided at a tip of the cable can pass through the tubular portion. . 3. The fin according to claim 2, wherein the plurality of fins substantially close the opening of the tubular portion on the side of the flange portion when the cable is not present inside the tubular portion. Waterproof structure of the cable insertion port described. 4. An annular wall portion is integrally formed on the outer wall surface of the case so as to surround the cable insertion port, and the flange portion of the cable insertion molded body is provided inside the annular wall portion. The waterproof structure of the cable insertion port according to claim 1, which is fitted. 5. The sealing material is provided between adjacent two of the plurality of fins in a state of being in contact with an outer surface of the cable.
The waterproof structure for a cable insertion port according to claim 1, wherein the cable insertion port has a viscosity that does not leak outside through a slit formed between the fins. 6. A first device, wherein a cable having a connecting member such as a connector attached to a tip thereof is provided in the first case and is drawn out of the first case from a cable outlet, A second device attached to the first case of the first device and provided with a second case having a cable insertion port into which the cable is inserted from the tip end thereof. The second device through the cable insertion port provided in the second case from the first device side.
Is a waterproof structure for preventing liquid that has entered the inside of the second case of the device from between the first case and the second case, and has elasticity or flexibility. Between a cylindrical portion integrally formed of a material and tightly inserted into the cable insertion port, and between a outer surface of the first case and an outer surface of the second case integrally provided on a base portion of the cylindrical portion. For inserting a cable, which includes a flange portion to be sandwiched and a plurality of fins, one side of which is supported by an edge portion of the opening portion of the cylindrical portion near the flange portion and arranged along the edge portion of the opening portion. A molded body, wherein the tip of the cable is inserted into the opening from the flange portion side and pulled into the case,
The plurality of fins are in contact with the outer peripheral surface of the cable in a state of being inclined toward the tip side of the cable, and the sealing material filled from the opening on the side opposite to the flange portion of the tubular portion is cured. The waterproof structure is characterized in that a seal portion is formed inside the tubular portion. 7. The waterproof structure according to claim 6, wherein a cross-sectional shape of the tubular portion is determined such that a connecting member provided at a tip of the cable can pass through the tubular portion. 8. An outer wall surface of the second case is integrally formed with an annular wall portion so as to surround the cable insertion port, and the flange portion of the cable insertion molded body is formed into the annular shape. The waterproof structure according to claim 1, wherein the waterproof structure is fitted in the wall portion, and an outer surface of the first case is in contact with an end surface of the annular wall portion. 9. The second case uses the plurality of screws penetrating the second case and the flange portion and screwed into the female screw portion provided in the first case. The waterproof structure according to claim 8, wherein the waterproof structure is attached to the case 1.