JP4267771B2 - Waterproof cable terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable terminal portion that is introduced into a waterproof case by wiring or the like in an electric vehicle and a terminal is connected in the waterproof case.
[0002]
[Prior art]
A conventional cable terminal portion of this type is shown in FIG. In the figure, 10 is a cable, 12 is a conductor exposed by stripping the end of the cable 10, 14 is an insulator, 16 is a shield layer, and 18 is a jacket. Reference numeral 20 denotes a waterproof part attached to the outer periphery of the end of the cable 10, and 22 denotes a terminal crimped to the conductor 12 of the cable 10.
[0003]
The waterproof part 20 includes a cylindrical part 26 attached to the outer periphery of the jacket 18 of the cable 10 via a waterproof packing 24, and a plug part 30 having a seal ring 28 on the outer periphery for closing a cable introduction hole of a counterpart waterproof case (described later). And a fixing portion 32 to the waterproof case. A retainer 34 is attached to the rear end of the cylindrical portion 26 to prevent the waterproof packing 24 from falling off, and a stop ring 36 is attached to the tip of the plug portion 30 to prevent the sealing ring 28 from falling off. The waterproof component 20 is made of metal (a die-cast product such as an aluminum alloy), the waterproof packing 24 and the seal ring 28 are made of silicon rubber, and the retainer 34 and the stop ring 36 are made of plastic such as PBT (polybutylene terephthalate).
[0004]
The waterproof component 20 includes a pinched elastic contact member 38 attached to the inner peripheral surface of the plug portion 30, and an inner sleeve 40 attached to the outer periphery of the cable insulator 14 and having one end inserted inside the shield layer 16. And is electrically connected to the shield layer 16 via. The shield layer 16 is pressure-bonded to the inner sleeve 40 by caulking the outer sleeve 42 attached to the outer side thereof. The inner sleeve 40 and the outer sleeve 42 are made of brass. Bolt holes 32 a are formed in the fixing portion 32 of the waterproof component 20.
[0005]
Next, a method for attaching the cable terminal configured as described above to the counterpart device will be described with reference to FIG. 44 is a waterproof case of the counterpart device made by die-casting aluminum alloy or the like. A cable introduction hole 46 and a female screw hole 48 that does not penetrate through the case are formed on the side surface of the waterproof case 44. The cable terminal portion is inserted into the cable introduction hole 46 from the terminal 22, and after fitting the plug portion 30 into the cable introduction hole 46, a bolt (not shown) inserted through the bolt hole 32 a of the fixing portion 32 is inserted. By screwing into the female screw hole 48, the waterproof case 44 is fixed. In this state, since the seal ring 28 on the outer periphery of the plug portion 30 is pressed against the inner peripheral surface of the cable introduction hole 46, the cable introduction hole 46 is sealed in a watertight manner. The shield layer 16 of the cable 10 is electrically connected (grounded) to the waterproof case 44 via the waterproof component 20.
[0006]
When the cable terminal portion is fixed to the waterproof case 44 as described above, the terminal 22 is arranged on the counterpart terminal 50 installed in the waterproof case 44, so that a bolt (not shown) is inserted into the bolt hole 22a of the terminal 22. The terminal 22 can be tightened and connected to the counterpart terminal 50 by being screwed into the female screw hole 50a of the counterpart terminal 50. This work is performed through the work opening 52 of the waterproof case 44. Although only one cable terminal portion is shown in FIG. 4, when there are a plurality of cable introduction holes 46 as shown, the cable terminal portion is attached to each of them. After the cable terminal portions are attached to all the cable introduction holes 46, the work openings 52 are sealed.
[0007]
The working opening 52 is sealed as follows. That is, a seal ring 56 is fitted into a groove 54 dug around the work opening 52, a cover 58 is put on the groove 54, and then a bolt (not shown) is inserted into a bolt hole 58a of the cover 58 to provide a waterproof case. Screw into 44 female screw holes 60. As a result, the lid 58 is fixed to the waterproof case 44 in a watertight manner.
[0008]
[Problems to be solved by the invention]
The conventional waterproof cable terminal has the above-described configuration, but this has the following problems. That is, in order to connect the terminal crimped to the cable conductor to the counterpart terminal in the waterproof case, the waterproof case is provided with a work opening, and this work opening must be sealed after the terminal is connected. Therefore, sealing parts such as a lid and a seal ring are required, which increases costs. The cable terminal must be attached from the side of the waterproof case with the cable introduction hole and from the top side of the work opening. When the waterproof case is installed in a narrow space It is difficult to secure a space for performing work.
[0009]
In view of the above problems, the object of the present invention is to eliminate the work opening of the waterproof case, reduce the work and parts necessary for sealing the work opening, and easily secure the work space. An object of the present invention is to provide a waterproof cable terminal unit.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the present invention attaches a waterproof part to the outer periphery of the end portion of the cable, and in a waterproof cable terminal portion in which a terminal is attached to the conductor exposed at the end portion of the cable.
The waterproof part includes a cylindrical part attached to the outer periphery of the outer sheath of the cable via a waterproof packing, a plug part having a substantially circular cross section that closes the cable introduction hole of the waterproof case containing the counterpart terminal, and the cable introduction hole. It has a seal ring on the outer periphery of the plug part pressed against the inner peripheral surface and a fixing part to the waterproof case, and it can rotate around the cable and can slide in the cable axis direction. And
The terminal is bent in an L shape so that the bolt hole faces the same direction as the cable axis at a position away from the cable axis,
The plug part of the waterproof part is provided eccentric to the cable so that the shortest distance Q from the cable axis to the outer peripheral surface is smaller than the distance P from the cable axis to the bolt hole of the terminal,
As a result, when the position of the waterproof part in the circumferential direction is determined so that the bolt hole of the terminal protrudes outside the outer periphery of the plug portion when viewed from the cable axis direction, the terminal bolt hole is screwed to the mating terminal. It looks like
It is characterized by this.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show an embodiment of the present invention. In FIG. 1 and FIG. 2, since the same code | symbol is attached | subjected to the substantially same part as the prior art example shown in FIG.3 and FIG.4, the overlapping description is abbreviate | omitted.
[0012]
The terminal 22 of the cable end portion is bent and formed into an L shape so that the bolt hole 22a is separated from the cable axis by a distance P and faces the same direction as the cable axis while being crimped to the conductor 12. For this reason, the cable introduction hole 46 of the waterproof case 44 is formed larger than before so that the L-shaped terminal 22 can be inserted. Further, the plug portion 30 of the waterproof part 20 is also formed larger than the conventional one in accordance with the cable introduction hole 46. The same applies to the seal ring 28 and the stop ring 36.
[0013]
The plug portion 30 is formed eccentrically with respect to the cable 10. The degree of eccentricity is set so that the shortest distance Q from the cable axis to the outer peripheral surface of the plug portion 30 is smaller than the distance P from the cable axis to the bolt hole 22a of the terminal 22.
[0014]
Since the plug portion 30 is considerably larger than the outer diameter of the cable 10 as described above, the inner cylindrical portion 62 is formed integrally with the cable 10 inside the plug portion 30. A hook-shaped elastic contact member 38 is attached to the inner peripheral surface of the inner cylindrical portion 62, and the elastic contact member 38 is in contact with a metal sleeve 64 that is crimped to the outer periphery of the shield layer 18 of the cable 10. As a result, the waterproof component 20 is electrically connected to the shield layer 18. The metal sleeve 64 can be formed, for example, by tightly winding a metal strip such as brass on the shield layer 18 and pressing it. In this state, the waterproof component 20 can rotate around the cable 10 and can slide in the cable axial direction.
[0015]
When attaching the cable terminal configured as described above to the counterpart device, the waterproof part 20 is first rotated around the cable 10 and the bolt hole 22a of the terminal 22 is plugged when viewed from the cable axial direction. The position of the waterproof component 20 in the circumferential direction is determined so as to protrude outward from the outer periphery of the portion 30, and the waterproof component 20 is slid rearward and retracted from the final mounting position. In this state, the cable terminal portion is inserted from the terminal 22 into the cable introduction hole 46, and the terminal 22 is brought into contact with the counterpart terminal 50 in the waterproof case 44 (at this time, the plug portion 30 is in front of the cable introduction hole 46). is there). Thereafter, the terminal 22 is tightened and connected to the counterpart terminal 50 by screwing the bolt 22 (not shown) into the female screw hole 50a of the counterpart terminal 50 through the bolt hole 22a of the terminal 22. The bolt hole 22a of the terminal 22 protrudes outside the outer periphery of the plug portion 30 and is visible from the rear of the waterproof part 20, and the bolt tightening tool can also be used without any trouble, so that this work can be easily performed as usual. It can be carried out.
[0016]
After the terminal 22 is tightened and connected, the waterproof component 20 is rotated around the cable 10 so that the bolt hole 32a of the fixing portion 32 is aligned with the female screw hole 48 of the waterproof case 44, and the waterproof component 20 is advanced in that state. Then, the plug portion 30 is pushed into the cable introduction hole 46. Next, when a bolt (not shown) is screwed into the female screw hole 48 through the bolt hole 32 a of the fixing portion 32, the waterproof component 20 is fixed to the waterproof case 44. In this state, since the seal ring 28 on the outer periphery of the plug portion 30 is pressed against the inner peripheral surface of the cable introduction hole 46, the cable introduction hole 46 is sealed in a watertight manner. The shield layer 16 of the cable 10 is electrically connected (grounded) to the waterproof case 44 via the waterproof component 20.
[0017]
As described above, this cable terminal portion can be tightened and connected to the terminal 22 from the cable introduction hole 46 of the waterproof case 44, so that there is no need to provide a work opening in the waterproof case as in the past, and the work opening is sealed. Since work and sealing parts are not required, costs can be reduced. Further, since the cable terminal portion can be attached only from the side surface of the waterproof case 44 where the cable introduction hole 46 is located, it is easy to secure the work space.
[0018]
In the above embodiment, the case where two cable introduction holes of the waterproof case are provided is shown. However, since the number of cable introduction holes is determined according to the function of the counterpart device, it may be 3 or more. The shape of the cable introduction hole is not limited to a circle, but may be an oval or an ellipse. Further, the present invention can be similarly applied to a cable terminal portion that does not require a shield layer to be connected.
[0019]
【The invention's effect】
As described above, according to the present invention, since the terminal can be tightened and connected from the cable introduction hole of the waterproof case, there is no need to provide a work opening in the waterproof case as in the prior art, and the work opening is sealed. Stop work and sealing parts can be reduced. For this reason, cost reduction can be aimed at. In addition, since the cable terminal portion can be attached only on the side of the waterproof case having the cable introduction hole, it is easy to secure the work space.
[Brief description of the drawings]
1A is a cross-sectional view showing an embodiment of a waterproof cable terminal portion according to the present invention, and FIG. 1B is a front view showing a positional relationship between the cable terminal portion of FIG. 1A and a hole of a waterproof case. .
FIG. 2 is a perspective view illustrating a method of attaching the cable terminal portion of FIG. 1A to a waterproof case.
FIG. 3 is a cross-sectional view showing a conventional waterproof cable terminal portion.
4 is a perspective view showing a method of attaching the cable terminal portion of FIG. 3 to a waterproof case.
[Explanation of symbols]
10: Cable
12: Conductor
14: Insulator
16: Shield layer
18: Jacket
20: Waterproof parts
22: Terminal
24: Waterproof packing
26: Tube
28: Seal ring
30: Plug part
32: Fixed part
44: Waterproof case
46: Cable introduction hole
48: Female screw hole
50: Mating terminal

Claims (1)

In the waterproof type cable terminal portion in which the waterproof part (20) is attached to the outer periphery of the end of the cable (18) and the terminal (22) is attached to the conductor exposed at the end of the cable (18).
The waterproof part (20) has a substantially circular cross section that closes the cable introduction hole of the waterproof case containing the cylindrical part (26) attached to the outer periphery of the jacket of the cable (18) via the waterproof packing and the counterpart terminal . The plug portion (30), the seal ring (28) on the outer periphery of the plug portion (30) pressed against the inner peripheral surface of the cable introduction hole, and the fixing portion (32) to the waterproof case are integrally provided. And is rotatable about the cable (18) and slidable in the cable axial direction.
The terminal (22) is bent into an L shape so that the bolt hole (22a) faces the same direction as the cable axis at a position away from the cable axis,
The plug part (30) of the waterproof part (20) is formed so that the shortest distance (Q) from the cable axis to the outer peripheral surface is smaller than the distance (P) from the cable axis to the bolt hole (22a) of the terminal. Eccentric with respect to (18),
Thus when viewed from the cable axial direction, while a bolt hole (22a) is that defines the circumferential position of the waterproof components to exit to the outside (20) the outer periphery of the plug portion (30) of the pin (22) The bolt hole (22a) of the terminal (22) is screwed to the counterpart terminal .
A waterproof cable terminal.

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