JPH0743609Y2 - Potentiometer mounting structure - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Field of Application The present invention relates to a mounting structure of a potentiometer for detecting displacement of a rotary shaft.

B. Outline of the Invention In the present invention, the potentiometer mounting structure for detecting the displacement of the rotary shaft is provided with a flange on the potentiometer bracket to connect the rotary shaft and the input shaft of the potentiometer. Since the outer circumference of the potentiometer's flange was clamped and fixed by the fixing bracket to the supporting bracket provided in the fixing part near the rotation axis, the clamp fitting was released to remove the clamping force from the input shaft of the potentiometer. Rotate only the potentiometer body with the drive shaft connected,
This is to make it easy to adjust the reference position of the potentiometer.

C. Conventional Technology A conventional potentiometer mounting structure will be described with reference to FIGS. 2 (a) and 2 (b), taking as an example the case where the potentiometer is mounted on an automated guided vehicle. In FIG. 2 (a), an automated guided vehicle 1 is configured by mounting a battery 5 on a frame 2 provided with a rear wheel 3 which is two driven wheels, a drive unit 6 including a front wheel 4a which is a drive wheel, and the like. Has been done.

The drive unit 6 includes a drive unit 4 formed to drive the front wheels 4a by a motor 4b, and a rotary shaft 7 provided on the drive unit 4 on a plate-like fixed unit 8 provided in front of the frame 2 and a bearing 9
The front wheel 4a is steered by rotatably supporting the front wheel 4a via a pulley 13 and 11, and a motor 13 via a belt 12. 14 is a sensor.

In the automatic guided vehicle 1 configured as described above, the upper end of the rotating shaft 7 penetrates the fixing portion 8 and projects upward,
At the upper end of the rotating shaft 7, the traveling direction of the automatic guided vehicle 1, that is,
A potentiometer 15 for detecting the direction of the front wheels 4a is provided.

Next, the mounting structure of the potentiometer 15 will be described with reference to FIG. The upper portion of the rotating shaft 7 is supported by a bearing 9, and the upper end thereof penetrates the fixing portion 8 and projects upward, and the upper end of the rotating member 7 is provided with a potentiometer 15.

The potentiometer 15 includes a support fitting 16 having legs 16a.
The potentiometer 15 is formed in the radial direction of the rotary shaft 7 by fitting the input shaft 15a of the potentiometer 15 into the coupling hole 7a formed in the rotary shaft 7. A set screw (not shown) is screwed into the screw hole 7b so as to be integrally connected to the rotary shaft 7, and the support fitting 16
It is attached by screwing a screw 17 into a screw hole 8a formed in the fixing portion 8 through a hole 16b formed in the leg portion 16a to fix the support fitting 16 to the fixing portion 8.

When the potentiometer 15 is attached, the rotary shaft 7
The so-called zero-point adjustment is performed so that the reference position of (1) and the reference position of the potentiometer 15 coincide with each other. Therefore, in the mounting work, the rotating shaft 7 is set to the reference position with respect to the fixed portion 8, while the input shaft 15a is set to the reference position so that the value of the potentiometer 15 serves as a reference. In this case, the support fitting 16 is fixed after connecting the rotating shaft 7 and the input shaft 15a.

D. Problem to be solved by the invention However, when the input shaft 15a is connected to the rotary shaft 7, the input shaft 15a often moves and the reference position is displaced,
Since the input shaft 15a or the rotary shaft 7 alone cannot be rotated for adjustment because of the structure, the potentiometer 15
Must be removed and the input shaft 15a must be rotated to match the reference position, and the above-mentioned mounting work must be performed again. This is extremely inferior in workability, and the position of the rotating shaft 7 and the potentiometer 15
There was a problem that it was necessary to repeat this work until the value of matched.

Then, this invention aims at providing the attachment structure of the potentiometer which solved such a subject.

E. Means for Solving the Problems The structure of the present invention for achieving the above object is to provide a bracket on a potentiometer with a flange, connect a rotary shaft to an input shaft of the potentiometer, and fix a metal fitting. Thus, the potentiometer is attached by sandwiching and fixing the flange portion to the support fitting provided on the fixed portion near the rotation axis.

F. Action According to the present invention, only the main body of the potentiometer can be rotated relative to the connected input shaft and rotation shaft by releasing the holding of the flange by the fixing bracket. Thus, the adjustment work of the potentiometer can be performed.

G. Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in FIGS. 1 (a) and 1 (b).

Since this embodiment is an improvement of a part of the conventional structure, the same parts are designated by the same reference numerals and the description thereof will be omitted.

A flange is integrally formed on the bracket portion 15b of the potentiometer 15 by fixing a donut plate-shaped flange plate 20 with a screw or the like.

On the other hand, the support metal fitting 16 has an input shaft 15 of the potentiometer 15.
An opening 16d through which a passes is formed, and the support fitting 16 is
At a position where the center of the opening 16d substantially coincides with the axis of the rotating shaft 7, the screw 17 is screwed into the screw hole 8a through the hole 16b, and is fixed to the fixing portion 8.

The input shaft 15a of the potentiometer 15 has an opening 1
It is fitted into a coupling hole 7a formed in the rotary shaft 7 via 6d and is coupled to the rotary shaft 7 by screwing a set screw (not shown) into the screw hole 7b.

In this state, the lower surface of the flange plate 20 integrally fixed to the potentiometer 15 has an opening 16 on the upper surface of the support fitting 16.
d It is in contact with the surroundings.

Then, the potentiometer 15 is configured such that the portion where the outer peripheral portion of the flange plate 20 and the periphery of the opening 16d of the support fitting 16 overlap each other is sandwiched by the fixing fittings 21 and 22 from the outer side in the radial direction of the potentiometer. Fixed to.

That is, the fixing metal fitting 21 is composed of a screw 21a and a plate-shaped nut 21b, and in the portion where the flange plate 20 and the supporting metal fitting 16 overlap, a head having a diameter larger than the screw portion of the screw 21a is provided on the outer periphery of the upper surface of the flange plate 20. By tightening the screw 21a in a state where the plate nut 21b can be engaged with the lower surface of the support metal fitting 16, the flange plate 20 and the support metal fitting 16 are integrated by the head of the screw 21a and the upper surface of the plate nut 21b. It is pinched and fixed.

At this time, the screw portion of the screw 21a is the flange plate 20 and the support fitting 1
It is located on the outside without penetrating 6.

On the other hand, in the fixing metal fitting 22, since the leg portion 16a exists, even if the screw portion of the screw 22a is arranged outside the supporting metal fitting 16, it is screwed into the plate-shaped nut 22b arranged below the supporting metal fitting 16. Since it is impossible to do so, a hole 16c is formed in the support fitting 16, and the screw portion of the screw 22a penetrates the hole 16c,
The flange plate 20 and the support fitting 16 are integrally clamped and fixed by the head of the screw 22a and the upper surface of the plate nut 22b.

In addition, when the fixing metal fittings are arranged only at the positions avoiding the leg portions 16a, it is not necessary to form the holes 16c in the supporting metal fittings 16.

The potentiometer 15 attached to the automatic guided vehicle 1 as described above is adjusted in the reference position (zero-point adjustment) as follows.

First, loosen the screws 21a and 22b.

In this state, since the flange plate 20 provided on the potentiometer 15 is released from being held, only the main body of the potentiometer 15 can be rotated relative to the input shaft 15a and the rotating shaft 7. .

Next, the front wheels 4a of the automated guided vehicle 1 are aligned with the reference position, that is, the rotary shaft 7 connected to the input shaft 15a is aligned with the reference position.

Then, while rotating only the main body of the potentiometer 15 in this state, adjust the value of the potentiometer 15 to the reference value, and then fix the potentiometer 15 by tightening the screws 21a, 22a at that position. And finish the work.

In the present embodiment, the fixing fittings 21 and 22 are composed of the screws 21a and 22a and the plate nuts 21b and 22b.
A female screw may be directly formed on the outer peripheral surface of the flange plate 20 between the heads of the screws 21a and 22a and the support fitting 16.

That is, the invention is not limited to this embodiment as long as it can be fixed to the support fitting 16 by sandwiching the outer periphery of the flange plate 20, and is generally called a clamp device having a sliding jaw, for example, Jikkaku Sho-39- Various clamping devices such as those found in 16608 may be used.

Further, in this embodiment, the fixing metal fittings 21 are provided at two opposite positions to attach the potentiometers 15, and it is preferable to provide a plurality of them at equal intervals in the circumferential direction, but sufficient fixing by sandwiching is possible. If possible, the number and arrangement are not particularly limited.

H. Effect of the Invention As described above, according to the potentiometer mounting structure of the present invention, the potentiometer is mounted on the supporting bracket by sandwiching the outer periphery of the flange of the potentiometer with the fixing bracket. By releasing the holding by the fixing bracket, only the potentiometer main body can be rotated with the input shaft of the potentiometer and the rotary shaft being connected.

That is, the value of the potentiometer can be adjusted by rotating only the potentiometer main body with the input shaft connected to the rotary shaft, so that the connection between the input shaft and the rotary shaft and the potentiometer can be adjusted. Adjustment work such as zero-point adjustment can be easily performed without removing the meter body and repeatedly performing the adjustment work.

[Brief description of drawings]

1 (a) is a drawing showing the mounting structure of the potentiometer of the embodiment, FIG. 1 (b) is a side view of the mounting structure of the potentiometer of the embodiment, and FIG. 2 (a) is an automated guided vehicle. FIG. 2 (b) is a mounting structure diagram of a conventional potentiometer. In the figure, 7 is a rotary shaft, 8 is a fixed part, 9 is a bearing, 15 is a potentiometer, 16 is a support fitting, 20 is a flange plate, 21 and 22 are fixing fittings, 21a and 22a are screws, and 21b and 22b are It is a plate nut.

Claims (1)

[Scope of utility model registration request] 1. A potentiometer mounting structure for detecting displacement of a rotary shaft, wherein a bracket is provided on a bracket of the potentiometer, and a support fitting is fixedly provided on a fixed portion near the rotary shaft. A potentiometer mounting structure, characterized in that an input shaft of the potentiometer is connected to a rotary shaft, and an outer periphery of a flange of the potentiometer is clamped by fixing fittings and fixed to the supporting fittings.