JPH05881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radar device that searches for a target object by rotating and tilting an antenna that emits radio waves.

A radar device for the purpose of search performs a search by continuously rotating in a fixed direction around the entire circumference in the turning direction, and driving up and down in a fixed angle range at a fixed speed in the elevation direction.

First, the structure of a conventional radar device will be explained using FIG. In FIG. 1, reference numeral 1 denotes an antenna, which is supported on an elevation axis 3 by a column 2.
A sector gear 4 is attached to the elevation shaft 3. A gear 5 meshes with the sector gear 4 and is rotated by a motor 7 via a gear box 6. Reference numeral 8 denotes a revolving frame, which is attached to the revolving and rotating pedestal section 9 . Reference numeral 10 denotes a swing bearing, which is inserted into the fixed pedestal part 11 and supports the swivel and rotation pedestal part 9. Reference numeral 12 denotes a swing gear, which is attached to the bottom of the swing rotation pedestal 9;
It's meshing with each other. The gear 13 is connected to the motor 15 via a gearbox 14 fixed to the fixed pedestal 11.
Rotated by

Next, the operation will be explained.

First, the elevation and elevation of the antenna 1 is caused by the rotation of the gear 5 via the gear box 6 by the motor 7, which drives the sector gear 4. The sector gear 4 is attached to the elevation shaft 3 and allows the antenna 1 to be elevated via the support 2. Similarly, for turning, the gear 13 is rotated by the motor 15 via the gear box 14, and the turning gear 12 is moved. The swing gear 12 is attached to the swing rotation pedestal 9, and the antenna 1 swings via the swing frame 8.

Since the conventional radar device is constructed as described above, two motors and a gearbox are required to rotate and raise the antenna 1, making the entire device heavy and expensive. Further, the motor 7 is switched between forward and reverse rotation in order to raise and lower the antenna 1, and its control is complicated.

This invention was made to solve these drawbacks, and proposes a lightweight and inexpensive radar device. An embodiment of the present invention shown in FIG. 2 will be described below.

In FIG. 2, 16 is a gear attached to the fixed pedestal 11, and the center of the gear 16 and the rotation bearing 1
The centers of 0 coincide. A pinion gear 17 is attached to the rotating frame 8 via a bearing 30 and meshes with the gear 16. Reference numerals 18 and 19 are bevel gears, which change the rotation of the pinion 17 to be substantially perpendicular to each other. 20 is an electromagnetic clutch, 21
is a brake, which engages the bevel gear 19 and the camshaft 22. Cams 23a and 23b are fixed to the camshaft 22 and rotate together with the camshaft 22. 24 is a lever fixed to the elevation axis 3;
As shown in the figure, it has two arms that are opened in a V-shape. At the tip of the lever 24, two cam followers 25a and 25b are attached to cams 23a and 23b, respectively.
It is installed so that it makes contact with the An antenna 1 is attached to the elevation axis 3 via a support 2.

Next, the operation will be explained. When the motor 15 is energized and rotates, the rotational force is transmitted to the gear 13 via the gear box 14, and the gear 13 starts rotating. Gear 13 is the turning gear 12
The rotational force of the gear 13 is transmitted to the swing gear 12, and the swing gear 12 swings around the swing bearing 10. Since the swing gear 12 is attached to the swing rotation pedestal 9 and the swing rotation pedestal 9 is attached to the swing frame 8, the swing frame 8 turns. Antenna 1 is attached to pillar 2
Since it is mounted on the rotating frame 8 via the elevation axis 3, the rotating frame 8 rotates, and the antenna 1 also rotates.

Similarly, when the swing frame 8 turns, the pinion gear 17 attached to the swing frame 8 via the bearing 30 also turns around the swing bearing 10. The pinion gear 17 is the fixed pedestal part 1
Since the pinion gear 17 is meshed with the gear 16 attached to the gear 16, the pinion gear 17 rotates and revolves around the outer periphery of the gear 16.
It will rotate around 0. When the pinion gear 17 rotates, the bevel gears 18 and 19 rotate, the camshaft 22 rotates via the electromagnetic clutch 20 and the electromagnetic brake 21, and the cam 23 rotates. When the cam 23 rotates, the lever 24 moves to the elevation axis 3.
A rocking rotational movement is performed with the elevation axis 3 as the center.
Along with this, the antenna 1 and support column 2 also have an elevation axis of 3.
Performs a tilting motion in unison with the body. At this time, a cam follower 25 is attached to the tip of the lever 24, and the cam 2
It is in contact with the outer circumferential surface of the camshaft 22 and converts sliding friction into rolling friction, thereby minimizing the required rotational torque of the camshaft 22.

The structure around the camshaft 22 will be explained in more detail with reference to FIGS. 3 and 4. FIG. 3 is a view around the camshaft 22 in FIG. 2, viewed from the right side. cam 23
a and the cam 23b are attached to the camshaft 22. The camshaft 22 is supported by a frame 27 via two bearings 28. An upper cam follower 25a is in contact with the cam 23a, and a lower cam follower 25b is in contact with the cam 23b.
With the rotation of a and 23b, the cam follower 25
a and 25b move up and down, and the lever 24 moves up and down around the up and down axis 3. Further, a limit switch 26b is installed below the cam 23a, and is activated when the large radius portion of the cam 23a comes downward. Further, a limit switch 26a is installed above the cam 23b, and is activated when the large radius portion of the cam 23b comes upward. Further, 29a and 29b are stoppers.

FIG. 4 shows details of the relative positional relationship between the cam 23 and the lever 24. A is the center of the elevation axis, B is the center of the cam shaft, and C and D are the centers of the cam follower. cam 23
The shapes of a and 23b will be explained in detail. Cam 23a
The circular arc EF is a true circular arc having a radius R1 centered on the center B of the cam 23, and the circular arc GH is a true circular arc having a radius R2. Here, R1 is larger than R2, and the robot will move up and down by the difference in radius. arc
FG and EH are curves whose radius is gradually decreased from radius R1 to radius R2. Cam 23b is cam 2
3a is installed at a position rotated clockwise around point B by an angle twice ∠BAC.
In addition, if the cam 23a is in a position where its large arc EF portion touches the cam follower 25a, the line segment
AC and BC are designed to be orthogonal. Similarly, if the cam 23b is in a position such that its large arc IJ portion touches the cam follower 25b, the line segment AD
and BD are designed to be orthogonal.

In the state shown in FIG. 4, the cam follower 25a is connected to the cam 23.
This is a state where the lever 24 is in contact with the large arc EF of a, and the lever 24 is pushed upward by the cam 23a. A stopper 29a is provided to prevent the lever 24 from moving upward any further. This is because the lever 24 is restrained by the cam 23a and the stopper 29a to prevent the antenna 1 from moving when an abnormal external force is applied to the antenna 1. Also, by adjusting the position of the stopper 29a, the cam follower 25a Cam 23a
The amount of play in between can be adjusted. Also, if an abnormal external force is applied to antenna 1, the line segment AC
Since the BCs are orthogonal, the cam follower 25a does not act as a force to rotate the cam 23a just by pushing it, but also serves as a self-locking mechanism.

The operation around the camshaft will be explained in more detail with reference to FIGS. 3 and 4. In the state shown in Figure 4, lever 2
4 is at the upper limit position, the limit switch 26a is activated as shown in FIG. In order to lower the lever 24 and raise the antenna 1 from this state, release the brake 21,
Connect clutch 20. Then the camshaft 22 moves to the fourth position.
Rotating in the direction of the arrow shown in the figure, the cam follower 25b is pushed down along the outer circumferential arc KJ of the cam 23b, and at the same time, the cam follower 25a is also lowered along the outer circumferential arc EH of the cam 23a. The camshaft 22 is approximately
When the cam 23b rotates 180 degrees and the approximate center of the large circular arc IJ comes into contact with the cam follower 25b, the limit switch 26b operates, and the signal disengages the clutch 20, causing the brake 21 to lock the camshaft 22. In this way, the rotation of the lever 24 is completed, and the antenna 1 is raised or lowered. In this case as well, the lever 24 is restrained by the stopper 29b and the cam 23b so that the antenna 1 will not fall any further even if an abnormal external force is applied to the antenna 1. Also, in this state, line segments AD and BD are orthogonal, so
Even if the cam follower 25b pushes the cam 23b due to an external force, the force does not rotate the cam 23b, resulting in a self-locking mechanism.

As described above, according to the present invention, only one motor and gearbox are required to rotate and raise and lower the antenna 1, resulting in a light weight and low cost. Furthermore, the motor can be easily controlled by simply rotating it in a fixed direction for turning. In the illustrated embodiment, the elevation angle position is detected using lever 2.
Although the limit switches 26a and 26b detect only the upper and lower limit points of 4, the elevation angle can be detected at any elevation angle position by attaching a synchronizer or the like to the elevation axis. It goes without saying that it can be done. Further, the present invention is not limited to the illustrated embodiments, and various modifications may be made without departing from the gist of the present invention.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a conventional radar device, Fig. 2 is a diagram showing the entire radar device according to the present invention, and Fig. 3 is a diagram showing a conventional radar device.
The figure is a view of the camshaft part in Fig. 2 viewed from the right side, and shows the relationship between the camshaft, lever, and limit switch in detail. FIG. 4 is a diagram seen from the left side of FIG. 3, and is a diagram for explaining the cam and lever in detail. In the figure, 1 is an antenna, 2 is a support, 3 is an elevation axis, 8 is a rotating frame, 9 is a rotating rotating pedestal,
10 is a swing bearing, 11 is a fixed pedestal, 12 is a swing gear, 13 is a gear, 14 is a gear box, 15 is a motor, 16 is a gear, 17 is a pinion, 18, 1
9 is a bevel gear, 20 is an electromagnetic clutch, 21 is a brake, 22 is a camshaft, 23 is a cam, 24 is a lever, 25 is a cam follower, 26 is a limit switch, 27 is a frame, 28 is a bearing, 29 is a stopper, 30 is a bearing It is. Note that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of Claims] 1. A radar device comprising an antenna and a drive unit that rotates and elevates the antenna, comprising: a fixed pedestal, the antenna is attached to the fixed pedestal, and the antenna is rotatably attached to the fixed pedestal. a rotating frame having a rotating rotating pedestal section; a driving section fixed to the fixed pedestal section for transmitting the driving force to the rotating rotating pedestal section to rotate the rotating frame; A gear provided on the fixed pedestal, a pinion gear that is attached to the rotating frame so as to mesh with the gear and rotates around the gear as the rotating frame rotates; It has orthogonal camshafts, a bevel gear for transmitting the rotation of these two almost orthogonal axes, an electromagnetic clutch attached to the camshaft, a brake, and two true circular arc portions with different radii on the circumference. one cam, which is in contact with the two cams and connected to the elevation shaft, such that when one lever contacts the large circular arc portion of the one cam, the other lever contacts the small circular arc portion of the other cam. A radar device characterized by comprising two levers in a positional relationship.