JPH0223079Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a support structure for a box cover fitted to a box frame of a geared motor.

"Prior Art" A geared motor A shown in FIG. 6 is a conventional example of a geared motor configured so that the rotational output of an AC motor can be obtained via a reduction gear.
It has been known. This geared motor A has a motor main body 3 having a rotor shaft 2 at the bottom of a bottomed cylindrical metal box frame 1, and a disc-shaped field plate 4 on the motor main body 3. Each motor is provided with a reduction gear part 6 having an output shaft 5 through the motor body, and by transmitting the rotational output of the rotor shaft 2 of the motor main body 3 to the output shaft 5 via the reduction gear part 6, a required rotational output can be obtained. This is a possible configuration. Furthermore, the geared motor A
In this case, the motor main body part 3 and the reduction gear part 6 are partitioned by the field plate 4, and a plate-shaped box cover 7 is fitted into the opening 1a of the box frame 1.
The opening 1a is closed. Support holes 8 are formed at designated positions of the field plate 4 and the box cover 7, and the output shaft 5 or the support shaft 9 of each gear of the reduction gear section 6 is inserted into the support hole 8. It has a well-supported configuration.

Here, in the case of the geared motor A, in order to accurately attach the box cover 7 to the opening of the box frame 1 without warping or distortion, it is necessary to attach the box cover 7 to the periphery of the opening of the box frame 1 and the outer periphery of the field plate 4. A fitting concave portion and a fitting convex portion are formed, and the box cover 7 is attached to the box frame 1 by fitting both portions.Furthermore, a supporting convex portion 4a is formed on the outer periphery of the field plate 4, and this supporting convex portion is formed. The lower surface of the box cover 7 is supported by the portion 4a.

By the way, since the field plate 4 has a support convex portion 4a on its outer circumference, conventionally,
As shown in FIG. 7, a required metal plate is punched out so that the supporting protrusion 4a remains.
After that, the supporting convex portion 4a is bent at right angles to the field plate 4 to form a shape that can be inserted into the box frame 1.

``Problems to be Solved by the Invention'' However, when the field plate 4 is manufactured as described above, because the field plate 4 is punched out of the metal plate so as to have the supporting protrusion 4a, the metal plate is wasted. There are more parts,
There was a problem that the material yield deteriorated and the manufacturing cost increased.

``Purpose of the invention'' The present invention has been made in view of the above circumstances, and it is possible to manufacture the field plate included in a geared motor at low cost without wasting materials, and it also has a cooling effect inside the geared motor. The purpose is to provide a support structure that has

``Means for Solving the Problems'' In order to solve the above-mentioned problems, the present invention stores a motor main body and a reduction gear part in a box frame separated by a field plate, and reduces the rotational output of the motor main body. In a geared motor which is configured such that a box cover can be outputted through a reduction gear part and a box cover is fitted into an opening of a box frame, supporting projections and cooling holes are formed by cutting and raising the field plate at a required position. However, the height of this supporting convex portion is set to a value that allows the box cover to be supported when the field plate is attached to the box frame.

``Function'' Because the supporting convex part and the cooling hole can be formed by cutting and raising a part of the field plate, the field plate can be manufactured by punching out a circular plate with the same diameter as the field plate from a metal plate. Waste is reduced, and the cooling holes in the field plate serve as escape paths for the heat generated by the motor body, thereby cooling the motor body.

Embodiment FIG. 1 shows a geared motor B to which an embodiment of the present invention is applied, and FIGS. 2 to 5 show a field plate 23 provided in an embodiment of the present invention.
It shows.

The geared motor B shown in FIG. 1 has substantially the same structure as the conventional geared motor A shown in FIG. 6 except for the field plate 23, which will be described later. That is, in Figure 1, 2
0 is the box frame, 21 is the motor body, 2
2 is a reduction gear part, 23 is a field plate, 2
4 each indicates a box cover. The motor body 21 includes a bobbin 26 around which a coil 25 is wound, a stator cup 27, a rotor shaft 28, a rotor support 29, and a magnet 3.
0, and the reduction gear section 22 has a plurality of support shafts 32 supported in support holes 31 formed in the field plate 23 and the box cover 24.
and an output shaft 33, and gears 34 attached to the support shaft 32 and the output shaft 33, respectively, and by transmitting the rotational output of the rotor shaft 28 to the output shaft 33 via the reduction gear part 22. The output shaft 33 can be rotated.

As shown in FIG. 2, the field plate 23 has a substantially donut shape, and is fitted inside the box frame 20 above the bobbin 26 inserted into the bottom of the box frame 20. At a position sandwiching the center of the field plate 23 and away from the support hole 31, there is a pair of support protrusions formed by cutting and raising a portion slightly inside the peripheral edge of the field plate 23 into a rectangular shape. The supporting protrusions 35 are provided vertically.
Cooling holes 36 are formed in each of the portions cut and raised to form the cooling holes. The support protrusion 35 supports the outer periphery of the bottom surface of the box cover 24 fitted into the opening of the box frame 20.

Next, the operation of this embodiment configured as described above will be explained.

In the geared motor B having the above configuration, the rotor shaft 28 is rotated by energizing the coil 25, and this rotation is transmitted to the output shaft 33 via each gear 34 of the gear reduction section 22. The output shaft 33 is rotated and used.

Here, the supporting convex portion 3 of the field plate 23
5 supports the outer periphery of the bottom surface of the box cover 24, prevents warpage or distortion of the box cover 24, and maintains the mounting accuracy and strength of the box cover 24. Particularly, the support protrusion 35 has an outer circumference (i.e., an outer circumference of the box cover 7) located slightly inside compared to the outermost circumference of the box cover 7 supported by the conventional support protrusion 4a.
4), the supporting effect of the field plate 23 is even more excellent. In addition, the cooling holes 36 formed in the field plate 23 allow the heat generated by the motor body 21 to escape to the reduction gear part 22 to prevent the motor body 21 from overheating and maintain stable operation of the motor body 21. It has the effect of

In addition, the manufacturing of the field plate 23 is as follows:
This is carried out by punching out a disk having support holes 31 etc. from a required metal plate, and by cutting and raising a part of the disk to form the support convex portion 35. Here, in the case of the field plate 4 having the conventional structure, when manufacturing the field plate 4, the support convex portion 4a is
However, when manufacturing the field plate 35 of this embodiment, it is necessary to punch out a metal plate so as to have the same diameter as the field plate 35 to be manufactured. Since the field plate 35 can be manufactured by punching out a circular plate from a metal plate, the wasted portion of the metal plate is reduced, the material yield is improved, and the cost of the field plate 35 can be reduced.

"Effects of the invention" As explained above, the present invention is a field plate provided in a geared motor, in which supporting convex portions and cooling holes are formed by cutting and bending. Field plates can be manufactured by punching out disks of the same diameter from a metal plate. Therefore, if the structure of the present invention is adopted, compared to the field plate of the conventional structure, which requires punching out a metal plate so as to have a supporting protrusion on the outer periphery,
This has the effect of reducing material waste, improving the yield associated with field plate manufacturing, and reducing costs. In addition, the cooling holes formed in the field plate cool the motor body by allowing the heat generated by the motor body, which is installed below the field plate and at the bottom of the box frame, to escape above the field plate. This has the effect of stably operating the motor body.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a sectional view of a geared motor, Figure 2 is a sectional view of a geared motor,
The figure is a plan view of the field plate, Figure 3 is a bottom view of the field plate, Figure 4 is a front view of the field plate, Figure 5 is a sectional view of the field plate, Figure 6 is a sectional view of a conventional geared motor, FIG. 7 is a plan view of a conventional field plate. 20...Box frame, 21...Motor main body, 22...Reduction gear part, 23...Field plate, 24...Box cover, 33...Output shaft, 35...Support protrusion, 36...Cooling hole .

Claims (1)

[Scope of utility model registration request] A motor main body and a reduction gear are housed in a box frame separated by a field plate, and the rotational output of the motor main body can be outputted via the reduction gear, and a box cover is placed in the opening of the box frame. In the geared motor, a supporting protrusion and a cooling hole are formed at a predetermined position of the field plate by cutting and raising a part of the field plate, and the height of the supporting protrusion is equal to the height of the field plate. 1. A support structure for a box cover in a geared motor, characterized in that the support convex portion is set to a value such that the support convex portion comes into contact with the lower surface of the box cover when the box cover is installed in the box frame.