JP3265214B2 - Coaxial cable fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable fixing structure for fixing a coaxial cable with a simple structure and for reliably grounding its outer conductor.

[0002]

2. Description of the Related Art A fixing and connecting structure of a coaxial cable in a conventional antenna device or the like will be briefly described. First,
The antenna device has an antenna element protruding from an antenna housing, and a base end of the antenna element is electrically connected to an amplifier, a matching device, or the like provided in the housing. Then, the exposed central conductor of the coaxial cable is electrically connected to the amplifier or the matching device by soldering or the like. Also, the exposed outer conductor of the coaxial cable is appropriately assembled, fixed to a base member made of a conductive material of the antenna housing by screws or soldering, and electrically connected. Further, the coaxial cable is fixed to the base member by being pressed by a fixing band or the like.

[0003]

In the above-described conventional coaxial cable fixing and connecting structure, since the coaxial cable is fixed to the base member by a fixing band or the like, the fixing operation is complicated. In addition, if a large tensile force acts on the coaxial cable, the coaxial cable easily shifts with respect to the fixing band, and ultimately a tensile force acts on the point where the outer conductor or the center conductor is connected, thereby interrupting the electrical connection. There is a possibility that it will be done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages of the conventional structure, and provides a coaxial cable fixing structure which is simple in structure and can be securely connected and fixed. With the goal.

[0005]

In order to achieve the above object, a fixing structure for a coaxial cable according to the present invention comprises inserting a coaxial cable with an outer conductor exposed to a fixing pipe made of a conductive material, and fixing the same. The outer pipe is crimped to clamp the outer conductor and fixed to the coaxial cable, and the fixing pipe is fixed to a base member made of a conductive material and electrically connected.

[0006] In the intermediate portion of the fixing pipe, a step portion having a thin tip side is formed, and a hole having a diameter through which the tip portion of the fixing pipe can be inserted but the step portion cannot pass is formed in the base member. With the distal end of the fixing pipe inserted into the hole, the distal end is expanded by caulking, and the expanded pipe and the step portion are configured to clamp and fix the fixing pipe and the base member. Is also good.

Further, the step portion may be formed by forming an enlarged portion having a constant thickness and an arc-shaped cross section at an intermediate portion of the fixing pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of one embodiment of the coaxial cable fixing structure of the present invention. FIG. 2 is a front view in which a fixing pipe is fixed to the coaxial cable by caulking. FIG. 3 shows a fixing pipe,
(A) is a front view and (b) is a plan view. FIG.
Shows a fixing spacer, (a) is a front view,
(B) is a plan view. FIG. 5 is a longitudinal sectional view of an antenna device using the coaxial cable fixing structure of the present invention.

First, with reference to FIG. 5, an example of an antenna apparatus using the coaxial cable fixing structure of the present invention will be described. An antenna cover 12 made of a flexible insulating resin is covered on an antenna element 10 made of a helical coil or the like. At the base end of the antenna element 10, a mounting bracket 14 made of a conductive material is provided, and a male screw is protruded in the axial direction. The antenna housing 16 is
It comprises an upper insulating resin case 18 and a lower base member 20 made of a conductive material. A nut member 18a made of a conductive material is integrally provided on the insulating resin case 18 by insert molding. The element 10 is fixed. Then, an amplifier 22 or a matching device is disposed in the antenna housing 16,
It is appropriately electrically connected to the nut member 18a. From the base member 20, mounting screws 24 made of a conductive material,
24 is protruded, is fixed to a vehicle body or the like with a rubber sheet 26 interposed, and is electrically connected to ground. Further, the power cable 28 and the coaxial cable 30 are introduced into the antenna housing 16 through the base member 20 and the rubber sheet 26. The power cable 28 is connected to a power supply terminal of the amplifier 22 or the like, the center conductor 30b of the coaxial cable 30 is connected to the amplification output terminal of the amplifier 22 or the like, and the outer conductor is electrically connected to the base member 20 and grounded. .

Next, a fixing structure of a coaxial cable according to the present invention will be described with reference to FIGS. A substantially cylindrical fixing spacer 32 made of an elastic insulating resin is inserted into the coaxial cable 30. Then, the coating of the coaxial cable 30 on the distal end side from the fixing spacer 32 is removed, and the outer conductor 3
The outer conductor 30a is exposed, and the outer conductor 30a is folded back to the side opposite to the distal end side and attached to the outer periphery of the fixing spacer 32. Further, a fixed thickness fixing pipe 34 made of a conductive material is inserted into the distal end side of the coaxial cable 30, and is fitted to the folded outer conductor 30a. Then, the fixing pipe 34 is caulked at a position facing the exposed outer conductor 30a, and the fixing pipe 34 is fixed to the outer conductor 30a.
a and is fixed to the coaxial cable 30 via the fixing spacer 32. The fixing pipe 34
An enlarged portion 34a having a constant thickness and an arc-shaped cross section is formed at a portion not facing the external conductor 30a at an intermediate portion of the above, and a step portion is formed. This state is shown in FIG.

Further, the fixing pipe 34 shown in FIG. 2 facing the outer conductor 30 a is inserted into the base member 20. The base member 20 is provided with a hole 20a having a diameter that allows the insertion of the enlarged portion 34a of the fixing pipe 34 but does not allow passage of the extended portion 34a, but allows insertion of the distal end. Therefore, the distal end side of the fixing pipe 34 is inserted into the hole 20a of the base member 20 until the insertion is restricted by the expanding portion 34a, and in this state, the distal end of the fixing pipe 34 is expanded by caulking. Then, the expanded end portion and the expanded portion 34a are clamped, and the fixing pipe 34 is fixed to the base member 20 and is electrically connected. Center conductor 30b of coaxial cable 30
Is exposed at an appropriate length and connected to the amplifier 22 as appropriate.

In such a configuration, the coaxial cable 30
Even if a large tensile force is applied to the base member 20 via the fixing pipe 34, the force is applied to the portion where the center conductor and the outer conductor are soldered or the like as in a conventional structure of this type. Does not join. Also, the coaxial cable 30
The outer conductor 30a is formed by the fixing pipe 34 and the base member 2
0 and the mounting screws 24, 24 are sequentially connected to the vehicle body reliably and grounded.

Although the fixing spacer 32 is made of an elastic resin in the above embodiment, it may be made of a non-elastic metal material. Further, the coaxial cable 30 may be fixed by caulking the fixing pipe 34,
The fixing spacer 32 may not be used. Furthermore, as long as the fixing pipe 34 can be fixed to the base member 20 with a simple structure and is electrically connected, it is not limited to caulking as in the above embodiment. For example,
A screw is engraved at the end of the fixing pipe 34 so that the base member 2
It may be screwed to the screw provided at 0. Further, the fixing pipe 34 may be fixed to the base member 20 by screwing or welding.

[0014]

As described above, since the coaxial cable fixing structure of the present invention is constituted, the following special effects can be obtained.

In the fixing structure for a coaxial cable according to the first aspect of the present invention, the fixing pipe is caulked and pressed against the outer conductor of the coaxial cable and fixed thereto, and the fixing pipe is fixed to the base member. The fixing of the coaxial cable to the base member and the electrical connection of its outer conductor can be reliably achieved by a simple structure.

In the fixing structure of the coaxial cable according to the second aspect, the tip of the fixing pipe is expanded by caulking, so that the fixing pipe can be easily fixed to the base member.

Further, in the fixing structure of the coaxial cable according to the third aspect, the base member is fixed so as to sandwich the base member by the expanded end formed by caulking the fixing pipe and the intermediate portion. However, due to the slight elasticity of the enormous portion having an arc-shaped cross section having a constant thickness, no play or the like is caused, and the fixing pipe can be securely and integrally fixed to the base member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a fixing structure of a coaxial cable of the present invention.

FIG. 2 is a front view in which a fixing pipe is fixed to the coaxial cable by caulking.

FIG. 3 shows a fixing pipe, (a) is a front view,
(B) is a plan view.

4A and 4B show a fixing spacer, wherein FIG. 4A is a front view and FIG. 4B is a plan view.

FIG. 5 is a longitudinal sectional view of an antenna device using the coaxial cable fixing structure of the present invention.

[Explanation of symbols]

 Reference Signs List 20 base member 20a hole 30 coaxial cable 30a outer conductor 32 fixing spacer 34 fixing pipe 34a enlarged part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01R 24/14 H01R 13/73

Claims (3)

(57) [Claims] 1. A coaxial cable having an exposed outer conductor is inserted into a fixing pipe made of a conductive material, and the fixing pipe is caulked to press-clamp the outer conductor and fix the outer conductor to the coaxial cable. A fixing structure for a coaxial cable, wherein the connecting pipe is fixed to a base member made of a conductive material and is electrically connected. 2. The fixing structure for a coaxial cable according to claim 1, wherein a step portion having a thin end portion is formed in an intermediate portion of the fixing pipe, and a tip portion of the fixing pipe can be inserted into the base member. The part is formed by drilling a hole having a diameter that cannot pass, and the tip is caulked and expanded in a state where the tip of the fixing pipe is inserted into the hole. A structure for fixing a coaxial cable, wherein the base member is held and fixed. 3. The fixing structure for a coaxial cable according to claim 2, wherein the step portion is formed by forming an enlarged portion having a constant thickness and an arc-shaped cross section at an intermediate portion of the fixing pipe. The fixed structure of the coaxial cable.