JPH025638Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a geared motor used to move various small appliances such as turntables in microwave ovens.

The purpose of this is to provide a geared motor that is equipped with a large heat dissipation plate to provide good heat dissipation during operation, and even with such a geared motor, space can be used effectively. be.

The drawings showing the embodiments of the present application will be described below. Reference numeral 1 designates a motor case, which is composed of a cylindrical peripheral wall plate 2 and side plates 3 and 4 that close both ends of the cylindrical peripheral wall plate 2.
As the material for forming the case 1, a magnetic material such as an iron plate that has good heat conductivity and can pass magnetic flux satisfactorily is used. The peripheral wall plate 2 and the side plate 3 are integrally formed (press molding). Further, the side plate 4 and the peripheral wall plate 2 are formed separately, and a fastening piece 5 provided around the side plate 4 is pressed into contact with the inner surface of an extension of the peripheral wall plate 2 (a gear case 23 to be described later). 2
and the side plate 4 are integrated. Next, 6 is the side plate 3
A center rod 7 is fixed at the center of the motor, and 7 is a rotating shaft rotatably attached to the center rod 6. The portion located inside the motor case 1 is a boss body 8, which protrudes from the side plate 4. The part is pinion 9. Reference numeral 10 indicates a rotor fixed to the boss body 8. In this figure, 8a is a support integral with the boss body 8, and 11 is a known annular permanent magnet attached to the support 8a. 12 is a well-known reverse stop mechanism, and the side plate 3
A locking body 1 is pivotably attached to the pin 14 using a pin 14.
3, and an engaging body 15 integrally formed with the boss body 8. Numerals 17 and 18 are magnetic pole pieces provided around the rotor 10, and a large number of these are formed by cutting and raising the side plates 3 and 4 of the motor case 1, respectively. Reference numeral 19 denotes an annular coil provided around the magnetic pole pieces 17 and 18, and is constructed by winding 21 around a bobbin 20. 22 indicates a lead wire. Next 23
A gear case is formed to extend in a cylindrical shape from one end of the peripheral wall plate 2 (the end on the side from which the rotary shaft 7 projects), and the inside thereof is a space for storing gears. 2
4 indicates a fastening piece provided at the tip thereof. 25 is a lid for closing the tip of the gear case 23, and is made of the same material as the case 1. Reference numeral 26 denotes a fastening piece which is brought into pressure contact with the inner surface of the case 23 to integrate the lid 25 with the case 23. This is in contact with the stopper piece 5, and the side plate 4 and the lid 2
It also functions as a spacer to maintain a constant distance from 5. Reference numeral 27 denotes a fitting piece which fits into a fitting part 28 formed on the case 23 to position the lid 25. Reference numeral 29 denotes an output shaft rotatably attached to the lid 25, and is arranged parallel to the rotating shaft 7. 30
is a gear train, one end of which is connected to the pinion 9 and the other end connected to the output shaft 29, so that the rotational force of the pinion 9 is decelerated and transmitted to the output shaft 29.

In the above configuration, the rotor 10 is rotated as is well known by supplying current to the coil 19 via the lead wire 22. In this case, the reverse stop mechanism 12
This action prevents the rotor 10 from rotating in reverse, causing the rotor 10 to rotate forward. The rotational force of the rotor 10 is transmitted to the output shaft 29 via the pinion 9 and the gear train 30, and from there to an external driven instrument.

Part of the heat generated from the coil 19 during the above operation is transmitted to the peripheral wall plate 2 surrounding the coil 19 and is radiated therefrom, and is further transmitted from the peripheral wall plate 2 to the gear case 23 and is also radiated from there. In the end, heat is radiated through their wide circumferential surfaces. Further, another part of the heat generated by the coil 19 is transmitted to the side plate 3 via the magnetic pole piece 17 and is also radiated therefrom. Furthermore, the other part is magnetic pole piece 1
8. Heat is transmitted to the gear case 23 via the side plate 4 and radiated from there.

As described above, in the present invention, since the rotating shaft 7 of the rotor 10 is connected to the output shaft 29 via a gear, the rotational force of the rotating shaft is transmitted to the output shaft and the rotational force is transmitted from there. Moreover, in the present invention, the heat generated by the coil 19 is transferred to the peripheral wall plate 2 of the motor case located on the peripheral side of the coil 19.
(a member made of a heat transfer material) and radiates the heat to the outside through the plate 2, which is effective in preventing excessive temperature rise within the case.

Furthermore, in the present invention, the peripheral wall plate 2 is greatly extended toward the output shaft 29 to obtain a very large heat dissipation surface, so that the heat dissipation effect described above is further enhanced.

Moreover, even with such a structure in which the peripheral wall plate 2 is extended to one side for heat dissipation, the space surrounded by it can be used as a gear room, and the extended member can be used as a gear case 23. There is an economic effect that can be used as a

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view, FIG. 2 is a bottom view, and FIG. 3 is an exploded perspective view. 1...Motor case, 2...Peripheral wall plate, 3, 4...
...Side plate, 7...Rotating shaft, 10...Rotor, 23...
...Gear case, 29...Output shaft.

Claims (1)

[Scope of utility model registration request] A hollow motor case is made of a heat-conducting magnetic material and is made up of a cylindrical peripheral wall plate and side plates that close both ends of the case.A rotor is rotatably housed in the center of the motor case. The shaft is made to protrude from one side plate to the outside of the case, and around the rotor there are provided stator magnetic pole pieces formed by folding up each side plate of the motor case, and further around which a ring-shaped coil is provided. The output shaft is parallel to the axis of the rotation shaft at a position on the side where the rotation shaft projects from the one side wall, and the output shaft is connected to a gear. In the geared motor, which is connected to the rotating shaft through A portion closest to the periphery of the separately formed side plate is extended in a direction substantially parallel to the rotation axis, and the separately formed side plate and its extension form a storage space for the gear; Furthermore, the geared motor is characterized in that the space is further closed off with a separately formed cover plate.