JPS6216771Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved reverse rotation prevention device for preventing a rotating electric machine such as an electric motor from reversing.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a frame of a rotating electric machine, for example, an electric motor, 2 is a stator, 3 is a rotor, 4 is a shaft, 5 is a rotating plate fastened to the shaft 4 by a nut 7, and 6 is one of the rotating plates 5. This is a presser plate attached to the main surface 5a, and is made of a flat plate. Reference numeral 8 denotes a fixed plate that also serves as a bracket and is disposed opposite to the other main surface 5b of the rotary plate 5, and the groove 1
It has 2. 9 is a steel ball, 10 is a bearing,
Reference numeral 11 denotes a guide hole formed to penetrate between the pair of main surfaces 5a and 5b of the rotating plate 5, into which the steel ball 9 is fitted. Note that the holding plate 6 is installed to prevent the steel ball 9 from jumping out of the guide hole 11. Further, the groove 12 of the fixed plate 8 is provided at a position facing the guide hole 11 of the rotary plate 5.
Further, the guide hole 11 is not provided perpendicularly between the pair of main surfaces 5a and 5b of the rotary plate 5, but is provided at a slight inclination.

The operation of the conventional reverse rotation prevention device configured as described above will be explained using FIGS. 2 and 3.
FIG. 2 shows a portion of the guide hole 11 in FIG.
- It is a partially enlarged sectional view showing the A cross section. FIG. 3 is a plan view of the rotating plate 5, and in this conventional device, four guide holes 11 are provided. In the figure, the same or corresponding parts as in FIG. 1 are given the same reference numerals.

First, a case will be described in which the electric motor rotates in the normal direction, that is, in the direction of arrow X in FIGS. 2 and 3. When normal rotation starts and the rotational speed increases, the steel balls 9 float up due to centrifugal force and come into contact with the presser plate 6 to stabilize, and this state is maintained as long as the motor is rotating at a predetermined rotational speed or higher. This means that the distance r ₂ between the center of the guide hole 11 on one principal surface 5a of the rotating plate 5 and the center of the rotating plate 5 is greater than the distance r2 between the center of the guide hole 11 on the other principal surface 5b of the rotating plate 5, that is, on the fixed plate 8 side. This occurs because the distance between the center of the rotary plate 5 and the center of the rotary plate ₅ is slightly larger than r1, and the guide hole 11 is formed obliquely with respect to the rotation direction X. Also, steel ball 9
This phenomenon occurs because the guide hole 11 is rotatably fitted into the guide hole 11.

Next, when the electric motor is stopped, when the rotational speed decreases to a predetermined rotational speed or less, the action of centrifugal force disappears, and the steel balls 9 descend along the guide holes 11. Accordingly, the steel ball 9 falls into the groove 12 of the fixed plate 8, and the electric motor stops.

Subsequently, the electric motor is reversed, i.e., as shown in FIGS.
The case of rotation in the direction opposite to the arrow X in the figure will be explained. When the electric motor attempts to reverse rotation, the steel balls 9 are restrained by the wall surface of the guide hole 11 and the groove 12 of the fixed plate 8, preventing the electric motor from rotating and preventing reversal. In this way, reverse rotation in conventional devices was prevented.

By the way, in such a conventional device, when the electric motor is rotated in the forward direction, it is necessary to float the steel balls 9 along the guide hole 11, and in order to easily obtain the action of the centrifugal force that accompanies rotation, the inclination of the guide hole 11 is It was necessary to make the angle considerably larger. For this reason,
When forming the guide hole 11 in the rotary plate 5 by drilling, the drill escapes, resulting in extremely poor workability. As a countermeasure against this, as shown in FIG. 4, before forming the guide hole 11 in the rotating plate 5,
A method has been used in which an auxiliary hole 13, such as a seat, is formed in one main surface 5a of the rotary plate 5, and then a guide hole 11 is formed.

However, in order to increase the inclination angle of the guide hole 11, the auxiliary hole 13 must also be formed large. Therefore, when the electric motor is rotated in the normal direction and the steel ball 9 is raised along the guide hole 11 and stabilized at the presser plate 6 part by centrifugal force, the steel ball 9 moves into the auxiliary hole 11 as shown in FIG. There was a problem in that the steel balls 9 were fixedly held at the end of the motor, and the steel balls 9 did not descend when the electric motor was stopped. As a result, when the electric motor rotates in reverse, the steel balls 9 no longer have the effect of preventing the reverse rotation.

This invention has been made in view of the above points, and aims to provide a reversal prevention device for a rotating electrical machine that can improve the machinability of guide holes in a rotary plate and reliably prevent reversal.

Hereinafter, one embodiment of this invented device will be described based on the drawings.

FIG. 5 is a plan view showing a part of the rotating plate of this embodiment device, FIG. 6 is a partially enlarged cross-sectional view taken along the line B-B in FIG. 5, and FIG. 7 is a presser plate 6 of this embodiment device.
FIG. 8 is a partial sectional view taken along the line CC in FIG. 7. In the figure, parts that are the same or corresponding to those of the conventional apparatus shown in FIGS. 1 to 4 are given the same reference numerals.

In this embodiment, an auxiliary hole 13 for forming the guide hole 11 of the rotary plate 5 is provided on one main surface 5a of the rotary plate 5, and a hemispherical shape is provided at a position corresponding to the auxiliary hole 13 of the holding plate 6. A convex portion 14 is formed.

In the embodiment device configured in this way, the rotary plate 5
Since the auxiliary hole 13 is formed on one main surface 5a, when forming the guide hole 11 with a large inclination angle, there is no escape of the drill, and the guide hole 11 with high precision can be formed with good workability. . Also,
When the electric motor having this embodiment device is operated, the steel balls 9 move against the presser plate 6 during forward rotation in the direction of arrow X.
When it comes into contact with the convex portion 14, it stabilizes and maintains this state. Next, when the electric motor is stopped, the steel balls 9 hit the convex part 14 of the holding plate 6 and do not reach the auxiliary hole 13 of the rotary plate 5, so they are fixedly held in the auxiliary hole 13. It will descend along the guide hole 11 without any trouble. Therefore, when the electric motor is reversed, the steel balls 9 are located in the groove 12 of the fixed plate 8, and the steel balls 9 are restrained by the groove 12 and the wall surface of the guide hole 11, thereby preventing the electric motor from reversing. Become.

In this embodiment, the shape of the convex portion 14 of the presser plate 6 is shown to be hemispherical and formed by extrusion processing, but the device of this invention is not limited to this, and may be of any shape such as a V-shape, or may be formed of a flat plate. It may also be one with protrusions attached to it. In addition, the guide hole 1 of the rotary plate 5
Although four guide holes 11 are shown, the effect can be obtained by providing at least one guide hole 11.

As mentioned above, this device has auxiliary holes for forming guide holes on the rotary plate to improve the machinability of the guide holes, and a convex part is provided at the position corresponding to the guide hole on the holding plate. This eliminates the need for the steel ball to protrude and to be fixedly held in the auxiliary hole, thereby ensuring the rolling of the steel ball in the guide hole and providing a highly reliable anti-reverse function.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the concept of a rotating electric machine, Figure 2 is a partially enlarged cross-sectional view taken along the line A-A in Figure 1, Figure 3 is a plan view of the rotating plate, and Figure 4 is a guide of a conventional device. 5 is a sectional view showing the holes, FIG. 5 is a plan view of the rotary plate showing an embodiment of this invented device, and FIG. 6 is B of FIG. 5.
-B sectional view, FIG. 7 is a plan view of a presser plate of an embodiment of the apparatus, and FIG. 8 is a CC sectional view of FIG. 7. In the figures, the same or corresponding parts are given the same reference numerals. 5... Rotating plate, 5a... One main surface, 5b...
Other main surface, 6...pressing plate, 8...fixing plate, 9...
...Steel ball, 11...Guide hole, 12...Groove, 13...
...Auxiliary hole, 14... Convex portion.

Claims (1)

[Scope of utility model registration request] A rotary plate having at least one guide hole penetrating between a pair of main surfaces and into which a steel ball is rotatably fitted, and an auxiliary hole provided on one main surface side for processing and forming the guide hole; a fixed plate disposed opposite to the other main surface of the rotary plate and having a groove at a position facing the guide hole; a fixed plate installed on one main surface of the rotary plate and having a protrusion at a position corresponding to the auxiliary hole; A rotating electrical machine comprising: a holding plate for the steel balls having a shaped portion, the steel balls being restrained by the grooves of the fixed plate and the wall surfaces of the guide holes of the rotating plate to prevent reversal. Anti-reverse device.