JP2603685Y2 - Screw jack for parabolic antenna - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw jack for a parabolic antenna used for driving a satellite communication antenna.

[0002]

2. Description of the Related Art A geostationary satellite for communication constantly changes its position slightly. Therefore, the parabolic antenna of the earth station using the satellite always moves slightly in order to track the geostationary satellite. On the other hand, a parabolic antenna needs to be stored at the zenith, such as during a typhoon, so a screw jack is required to have sufficient stroke and speed at the same time. Conventionally, this type of screw jack
One large screw jack is used for both large stroke movement and small fluctuation.

[0003]

[Problems to be Solved by the Invention] In the above-described conventional screw jack for a parabolic antenna, since a large screw jack also moves delicate fluctuations, only a part of the screw shaft is worn out, and the step is reduced. There is a drawback that the life is significantly shortened, such as sticking.

[0004]

Means for Solving the Problems The present invention Parabo La antenna <br/> Na of the screw jack is Parabo installed in a variable angle
In a screw jack for a parabolic antenna for changing the angle of the antenna, a rotary shaft rotatably supporting a first support point at a bottom of the reflector of the parabolic antenna and a second support point for driving the bottom of the reflector are provided. Clevis and one end of the clevis
The jack body is connected via trunnion bearings.
And large screw jack which is supported on the mount portion of the parabolic antenna, supported on the large screw jacks
Erare, telescopic shaft has a small jack for connecting a torque arm linked to an eccentric shaft of the trunnion bearing unit, by rotating the eccentric shaft by stretching the telescopic shaft of the small jack, the jack cylinder The trunnion bearing
The large screw jack
Certain end as configuration for infinitesimal traveling.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a structural diagram of an entire parabolic antenna apparatus to which a large screw jack according to an embodiment of the present invention is applied, and FIG. 2 is an enlarged view of a trunnion bearing portion of the large screw jack shown in a portion A of FIG. FIG. 3 is a BB transverse sectional view of the shaft portion shown in the embodiment of FIG.

The embodiment of FIG. 1 has a reflector portion 10 of an antenna, a mount tower 8, and a rotation axis 8A for elevation of the antenna. In addition, the reflector unit 10
Large size with one end rotatably attached to the clevis part 7
The screw jack 1 is fixed to the mount tower 8
To the yoke part 9 via the trunnion bearing part 4
2 are installed.

Next, the structure and operation of a small screw jack incorporated in a large screw jack, which is a main part of this embodiment, will be described with reference to FIGS. The jack body 2 of the large screw jack 1 is supported by a trunnion bearing 4 via an eccentric shaft 3 of an eccentric shaft mechanism. here
As the trunnion bearing portion 4, the longitudinal length of the jack body 2 is used.
The shaft holes 2a provided on both sides in the center in the direction support the shaft rotatably.
Well-known ones are used, and in this embodiment, the shaft and
Thus, the eccentric shaft 3 is used. This eccentric shaft 3 is shown in FIG.
A shaft portion 3a that rotates about the axis X1,
The shaft portion 3a is provided integrally with the shaft portion 3a and about the axis X2.
And a roll portion 3b which is eccentric with respect to the shaft portion 3a by e.
The shaft hole 2a of the jack body 2 has this roll portion 3b
I support it. Further, the trunnion bearing 4 is fixed to the yoke 9 by mounting bolts 11. Of the eccentric shaft 3
Shaft portion 3a, Shin small jack 6 via the torque arm 5
The pin is connected to the contraction shaft . Body 6A of small jack 6
Are supported by a large jack 1.

In the state shown in FIG. 2, when the small jack 6 is expanded and contracted , the torque arm 5 swings, and the eccentric shaft 3 connected to the torque arm 5 performs eccentric rotation. That is, eccentricity
When the shaft portion 3a of the shaft 3 rotates around the axis X1, the low
The eccentric part 3b rotates eccentrically. Thus, the lobe of the eccentric shaft 3
The portion 3b rotates eccentrically inside the shaft hole 2a of the jack body 2.
And the jack body 2 is a trunnion bearing by the eccentricity e.
It is slightly displaced relative to the portion 4 in the longitudinal direction of the large jack .
Thereby, one of the large jacks connected to the clevis portion 7 is
End is moved in the same way as in the case of large jack itself was fine drive
Move.

According to this structure, since the function of the large jack is not impaired, it is possible to sufficiently cope with the case where the large jack for moving the antenna to the zenith at a high speed, such as a typhoon, has a long stroke. In this embodiment, the case where this structure is used for the trunnion bearing portion has been described. However, the same function can be obtained by using the same structure for the large jack tip clevis portion 7.

[0010]

[Effects of the Invention] As described above, the present invention incorporates a small jack into a large screw jack,
Since it is no longer necessary to operate the large jack for the fine drive, only a part of the large jack screw portion is not significantly worn.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a parabolic antenna device including an embodiment of the present invention.

FIG. 2 is a configuration diagram of a large screw jack as a main part of the present embodiment.

FIG. 3 is a sectional view taken along line BB of the embodiment of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 large screw jack 2 jack body 3 eccentric shaft 4 trunnion bearing part 5 torque arm 6 small jack 6A body part 7 clevis part 8 mount tower 8A rotating shaft 9 yoke part 10 reflector part 11 mounting bolt

Continuation of front page (56) References JP-A-62-1302 (JP, A) JP-A-57-155806 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 3 / 04 B66F 11/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A screw jack dish for changing the angle of Parabo La Antenna mounted on a variable angle, a rotation shaft that rotatably supports the first support point of the reflector bottom portion of the parabolic antenna, the reflector bottom portion A clevis part provided at a second support point for driving the clevis part, and one end is attached to the clevis part,
Through the trunnion bearing, the
Large screw jack supported on the port part, and supported by the large screw jack , the telescopic shaft is
The torque arm connected to the eccentric shaft of the trunnion bearing
A small jack for connecting the jack body to the trunnion by extending and retracting a telescopic shaft of the small jack to rotate the eccentric shaft.
A screw jack for a parabolic antenna, wherein the screw jack is slightly displaced with respect to a bearing to slightly move one end of the large screw jack.