JPH0528107U - Grounding structure for vehicle antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] To ensure antenna grounding by the ground plate even when the dimensions of the mounting parts are mismatched when the antenna is mounted or the coating layer of the vehicle body panel is thick. [Structure] A spring washer 16 for matching is interposed between a stopper 6 of an antenna body 3 and an antenna support 4. Also, the axial movement of the antenna main body 3 when the nut 12 is screwed into the antenna main body 3 and closed in the small-diameter cylindrical portion 4a of the antenna support 4 fitted to the antenna main body 3 and the antenna support 4 and the ground. A conversion mechanism 17 that changes the movement of the plate 8 around the axis is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grounding structure for a vehicle antenna, which enables the antenna to be grounded when mounted on the vehicle body.

[0002]

[Prior Art]

 Conventionally, a grounding structure for this type of vehicle antenna is known, for example, from Japanese Utility Model Publication No. 62-8712.

FIG. 5 and FIG. 6 show an example of an antenna mounting mechanism including a grounding structure for a conventional vehicle antenna of this kind. Reference numeral 1 is a telescopic type antenna element, and the antenna element 1 is an insulating element. It is mounted in a pipe-shaped antenna main body 3 through the housing pipe 2 so that it can be stored and extended.

Reference numeral 4 denotes a conductive antenna support for attaching the antenna body 3 to a vehicle body panel 5 of the vehicle. The antenna support 4 includes a small-diameter cylindrical portion 4a fitted to the outer periphery of the antenna body 3 and The large-diameter cylindrical portion 4b has a large-diameter cylindrical portion 4b connected to the upper end of the small-diameter cylindrical portion 4a, and the upper end surface of the large-diameter cylindrical portion 4b is formed obliquely in conformity with the vehicle body panel 5. Further, the antenna support 4 is held on the upper end side of the antenna main body 3 by engaging the lower end surface of the small diameter cylinder portion 4a with the stopper 6 formed on the antenna main body 3, and the small diameter cylindrical portion 4a is also held. The inner surface of is engaged with a support positioning claw 7 formed on the antenna body 3 so as to be relatively prevented from rotating.

Reference numeral 8 denotes a donut disc-shaped earth plate fixed on the upper end surface of the large-diameter cylindrical portion 4b of the antenna support 4. The upper surface of the earth plate 8 is formed by breaking the coating layer of the vehicle body panel 5 and forming a body panel. Is formed with a plurality of protrusions 8a for improving the electrical conduction of the. Further, between the earth plate 8 and the vehicle body panel 5 facing the earth plate 8, a rust preventive rubber 9 for preventing rusting of an electrical contact portion between the vehicle body panel 5 and the projection 8a is interposed.

Reference numeral 10 denotes a cylindrical antenna mounting base that is inserted into the large-diameter cylindrical portion 4 b of the antenna support 4 from the antenna mounting hole 5 a formed in the vehicle body panel 5. The antenna mounting base 10 is an antenna mounting hole. The edge 5a has an inclined flange portion 10a facing from the outside, and the flange portion 10a is provided with a waterproof and dustproof sealing member 11 that is in pressure contact with the vehicle body panel 5, and also the antenna mounting base 10a. A cylindrical step portion 10b that fits around the outer circumference of the antenna is formed at the insertion end portion.

Reference numeral 12 denotes an antenna mounting nut having a head portion 12 a that abuts on an upper opening edge of the antenna mounting base 10 and a cylindrical portion 12 b that is continuously provided to the head portion 12 a and is inserted into the antenna mounting base 10. On the inner wall surface of the cylindrical portion 12b of the nut 12, there is formed a female screw 14 that engages with the male screw 13 formed on the outer periphery of the upper end of the antenna body 3. Reference numeral 15 denotes a resin sealing member that prevents water and dust from entering through the gap between the antenna top 1a of the antenna element 1 and the nut head 12a.

In the conventional antenna mounting mechanism configured as described above, when the nut 12 screwed into the male screw 13 of the antenna body 3 is tightened, the antenna integrated with the antenna body 3 is accompanied by the tightening operation. The antenna mounting base 10 that holds the support 4 and the nut 12 moves relatively in the directions of arrows A and B in FIG. 5, respectively, to reduce the distance between the erected plate 8 and the inclined collar portion 10a of the antenna mounting base 10. Thus, the vehicle body panel 5 is pinched from both inside and outside through the rust preventive rubber 9 and the seal member 11. This fixes the antenna to the vehicle body panel 5.

On the other hand, when the nut 12 is tightened to a state where the antenna can be stably fixed to the vehicle body panel 5, the protrusion 8a of the ground plate 8 penetrates the rustproof rubber 9, and its tip is attached to the vehicle body panel 5. Break the coating layer of to reach the bare metal layer. As a result, electrical connection is established between the ground plate 8 and the vehicle body panel 5, and the antenna body 3 can be grounded to the vehicle body panel 5.

[0010]

[Problems to be solved by the device]

 However, in such a conventional grounding structure for a vehicle antenna, the position of the antenna support 4 with respect to the axial direction of the antenna body 3 is determined by the stopper 6, and the positioning claw 7 also determines the position in the axial direction. Since the structure is fixed, the antenna mounting nut will be misaligned when mounted on the vehicle body due to vertical displacement of the antenna body at the antenna mounting position or variation in height of the antenna support itself. If the ground plate does not come into contact with the vehicle body panel even after tightening, or if the panel coating layer is thick even if it comes into contact, there is a problem that the coating layer cannot be broken and grounding failure occurs. It was

The present invention provides a grounding structure for a vehicle antenna, which can ensure the grounding of the antenna by the ground plate even when the dimensions of the mounting parts are not matched when the antenna is mounted or the coating layer of the vehicle body panel is thick. The purpose is to

[0012]

[Means for Solving the Problems]

 The present invention will be described with reference to FIGS. 1 and 2 which are one embodiment. In the present invention, the antenna is grounded to the vehicle body panel 5 by pressing the earth plate 8 having the protrusion 8a against the vehicle body panel 5 by the antenna mounting mechanism. It is applied to the grounding structure of the antenna for the vehicle. And, the above-mentioned object is to make the elastic mechanism 16 which absorbs the mismatch of the antenna mounting mechanism with respect to the earth plate 8 in the pressing direction and the movement of the antenna mounting mechanism which presses the earth plate 8 in the pressing direction the movement of the earth plate 8 in the rotational direction. Can be achieved by including a conversion mechanism 17 for converting

[0013]

[Action]

 Misalignment due to the dimension of the antenna mounting mechanism in the pressing direction of the earth plate or the like is absorbed by the elastic mechanism 16 and the pressing force of the earth plate 8 against the vehicle body panel 5 is made appropriate. Then, the conversion mechanism 17 converts the movement of the antenna mounting mechanism in the earth plate pressing direction into the movement of the earth plate 8 in the rotational direction, so that the projection 8a of the earth plate 8 scrapes off the coating layer of the vehicle body panel 5. To work. This ensures that the antenna is grounded by the ground plate.

It should be noted that, in the section of means and action for solving the above problems for explaining the configuration of the present invention, the drawings of the embodiments are used for the sake of easy understanding of the present invention. It is not limited to the example.

[0015]

【Example】

 First Embodiment FIGS. 1 and 2 are a sectional view and an exploded perspective view of an antenna mounting mechanism portion showing a first embodiment of the present invention. 1 and 2, the same parts as those of FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted. The parts different from those of FIGS. 5 and 6 will be mainly described.

In the first embodiment, as in FIGS. 5 and 6, the antenna main body 3 for housing the telescopic type antenna element 1, the antenna support 4, the earth plate 8 having the protrusion 8 a, the antenna mounting base 10 and In addition to having the antenna mounting nut 12, the axial washer 16 for adjusting the height dimension of the antenna support 4 and the axial movement of the antenna body 3 that occurs when the nut 12 is screwed into the antenna body 3 and tightened. It is characterized in that a conversion mechanism 17 for converting the movement of the antenna support 4 and the earth plate 8 into the movement around the axis is provided.

The height dimension matching spring washer 16 is interposed between the stopper 6 provided on the antenna body 3 and the lower end surface side of the small diameter tubular portion 4 a of the antenna support 4, and the spring washer 16 allows the antenna support 4 to be supported. By constantly urging the vehicle body panel 5 toward the vehicle body panel 5 side, it is possible to absorb a height dimension mismatch between the vehicle body panel 5 and the stopper 6.

The conversion mechanism 17 for converting the axial movement of the antenna body 3 into the axial movement of the antenna support 4 and the earth plate 8 is provided on the outer periphery of the small diameter tubular portion 4 a of the antenna body 3 on the fitting side. The positioning pin 17a and the lead groove 17b formed on the inner peripheral wall surface of the small-diameter tubular portion 4a and slidably engaged with the pin 17a.

In the antenna mounting mechanism of the present embodiment configured as described above, when the nut 12 screwed into the male screw 13 of the antenna body 3 is tightened, the antenna body 3 moves in the direction of arrow A in FIG. At the same time, the antenna support 4 contacting the stopper 6 via the spring washer 16 also moves in the same direction, and the earth plate 8 fixed on the inclined upper end surface of the antenna support 4 is attached to the vehicle body panel 5 via the rust preventive rubber 9. By pressing from the lower surface side, the tip of the protrusion 8a penetrating the rust preventing rubber 9 is brought into contact with the vehicle body panel 5. Then, when the nut 12 is further tightened, the protrusion 8a of the ground plate 8 pierces the coating layer of the vehicle body panel 5 and the spring washer 16 is compressed. As a result, it is possible to absorb a height dimension mismatch occurring in the antenna support 4 and apply an appropriate pressing force to the vehicle body panel 5.

On the other hand, as the spring washer 16 is compressed, the pin 17a that moves integrally with the antenna body 3 in the direction of arrow A slides on the inclined portion 17b1 of the lead groove 17b. A component force in the direction of arrow C that is perpendicular to is generated. This component force acts on the antenna support 4 and causes the antenna support 4 to rotate around the axis of the antenna body 3 by an amount corresponding to the length of the inclined portion 17b1 together with the arrest plate 8. For this reason, the protrusion 8a of the ground plate 8 scrapes off the coating layer of the vehicle body panel 5, which completes the contact between the bare metal surface of the vehicle body panel 5 and the protrusion 8a, and completes the antenna body. It is possible to secure proper grounding.

As described above, in the first embodiment, since the spring washer is provided between the antenna support and the stopper, the height dimension of the antenna support may be inconsistent or the opposing surface between the vehicle body panel and the antenna support may be formed. Even if there is a shape mismatch between them, it is possible to absorb this and apply an appropriate pressing force to the vehicle body panel and the ground plate. Therefore, the protrusion of the earth plate can be brought into contact with the vehicle body panel, and the earth can be secured to the vehicle body panel. In addition, when tightening the nut for mounting the antenna, a conversion mechanism that converts the axial movement of the antenna main body into the movement around the axis of the antenna support is provided between the antenna main body and the antenna support. Since the membrane layer is scraped off by the protrusion of the earth plate, even if the coating layer of the vehicle body panel is thick, the electrical conduction of the earth plate to the vehicle body panel is ensured and a more complete grounding is secured. be able to.

-Second Embodiment- FIG. 3 is a cross-sectional view of an essential part showing a second embodiment of the present invention. The second embodiment differs from the first embodiment in that the stopper 6A itself provided on the antenna body 3 has a spring function. Also in the second embodiment, the same operational effect as in the first embodiment can be obtained.

—Third Embodiment— FIG. 4 is a cross-sectional view of an essential part showing a third embodiment of the present invention. The third embodiment differs from the first embodiment in that the spring washer is replaced by a donut-shaped elastic member 20 made of rubber or other material between the stopper 6 and the antenna support 4. .. Also in the second embodiment, the same operational effect as in the first embodiment can be obtained.

Although the conversion mechanism 17 is provided between the antenna main body 3 and the antenna support 4 fitted to the antenna main body 3 in the above embodiment, the present invention is not limited to this, and the arrest plate 8 may be directly rotated. May be. Further, the ground plate 8 may be provided with a spring mechanism for dimensional matching, and the antenna mounting mechanism is not limited to the structure shown in the above embodiment.

[0025]

As described above, according to the present invention, the movement of the antenna mounting mechanism for pressing the ground plate is converted by absorbing the inconsistency of the dimension of the antenna mounting mechanism in the pressing direction of the ground plate by the elastic mechanism. Since the mechanism can convert to the movement of the earth plate in the rotating direction, even if there is a mismatch in the size of the antenna mounting mechanism in the direction of pressing the earth plate, or even if the coating layer of the vehicle body panel is thick, The antenna grounding can be ensured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of each part in FIG.

FIG. 3 is a sectional view of an essential part showing a second embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of an antenna mounting mechanism having a conventional antenna grounding structure.

FIG. 6 is an exploded perspective view of each component in FIG.

[Explanation of symbols]

 1 Antenna Element 3 Antenna Main Body 4 Antenna Support 5 Body Panel 6 Stopper 8 Earth Plate 8a Protrusion 10 Antenna Mounting Base 12 Antenna Mounting Nut 16 Spring Washer 17 Conversion Mechanism 17a Pin 17b Lead Groove

Claims (1)

[Scope of utility model registration request] 1. A grounding structure for a vehicle antenna, wherein a ground plate having a protrusion is pressed against a vehicle body panel by an antenna mounting mechanism to ground the antenna to the vehicle body panel, wherein the pressing direction of the antenna mounting mechanism is not aligned with the ground plate. A grounding structure for an antenna for a vehicle, comprising: an elastic mechanism that absorbs; and a conversion mechanism that converts a pressing direction movement of the antenna mounting mechanism that presses the earth plate into a rotation direction movement of the earth plate.