JPH0357096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a small motor that rotates in synchronization with an AC power source and has a rotor part and a gear part housed in the same case.

[Prior art]

Conventionally, small motors that house a rotational direction regulating mechanism and a reduction gear part that regulate reverse rotation of the rotor have the rotational direction regulating mechanism facing the rotor pinion, so the rotational direction is controlled between the metal core with the magnetic poles cut and raised. Since it is not possible to provide a regulating mechanism, for example, cut out a comb-shaped magnetic pole upward from the bottom of the cup-shaped lower case, press fit the cup-shaped upper case into this lower case, and insert it from the bottom of the upper case. Cut and raise the downward comb-shaped magnetic poles and place the coil bobbin in the lower case to form the rotor part.A cover plate is fixed to the upper case by caulking, and the upper case and cover plate are housed in the upper case to regulate the rotation direction. Since the mechanism and gear part were bearings, the thickness became thicker and the gear part had to be configured within the outer diameter of the rotor part, so the arrangement of the gear train was flexible enough to satisfy the optimum conditions for the gear part. There is a drawback that it cannot be done. Furthermore, due to thickness restrictions, the gear cannot have sufficient strength, so it is necessary to use a material with high strength. Furthermore, if the distance between the magnetic poles of the upper case and the magnetic poles of the lower case is set using the coil bobbin, positioning during the press-fitting process becomes troublesome and costs increase, and the motor cannot be assembled automatically.

As another example, the upper body described above may be formed into a disk 21 having magnetic poles as shown in FIG. 6, and a rotor portion and a gear portion may be stacked in one case 22 with the disk 21 in between. , coil bobbin 2 as above
When the spacing between both magnetic poles is set in step 3, the coil bobbin is provided with a convex portion that engages with the disc 21 and the case 22, or an uneven portion is formed on the inner peripheral surface of the winding body of the coil bobbin to insert the magnetic pole. This makes the coil bobbin expensive, and since the disk 21 supports the bearing of the gear part, the disk 21 is press-fitted onto the coil bobbin inside the case 22, making assembly troublesome and difficult to assemble automatically. There is a drawback that the strength of the coil bobbin that holds the plate 21 with the coil bobbin must be strengthened. Furthermore, if the coil bobbin is deformed due to external temperature or heat generated by the motor, the spacing between the magnetic poles changes and the motor characteristics deteriorate.

[Purpose of invention]

In view of the above-mentioned drawbacks, the present invention has a simple structure that allows the thickness of the motor to be reduced, and
The purpose of this project is to propose a small motor that has a gear train configuration with a degree of freedom in the gear section and has sufficient gear strength.

[Structure of the idea]

In the present invention, concave portions for accommodating a rotor portion and a gear portion are formed side by side in one of the two cases, and a core on which a magnetic pole facing the rotor is formed is placed in the concave portion on the rotor portion side. It is positioned and installed so that a space is formed between it and the inner surface of the case, and a pinion rotated by the rotor is disposed within the space, and the rotation of the pinion is transmitted to the gear section via the space. A bobbin having a coil wound thereon is clamped and fixed between the core and the other case.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. As shown in FIGS. 1 to 4, the small motor has two shafts 10 and 11 facing upward on the bottom surface of a rotor side recess 1a of a cup-shaped lower case 1 in which two recesses are connected.
are provided, their lower ends are caulked and fixed, and two shafts 12,
The lower ends of the bearings 13 are fixed by caulking, and the bearings 1
4 is fixed. An intermediate gear 3 in which a rotational direction regulating member 2 is rotatably mounted on a shaft 10 is fitted into a shaft hole 4a of a core 4. Magnet 1 on shaft 11
The rotor 5 to which the rotor 5 is fixed is fitted to the bush 16. The first reduction gear 6 is attached to the shaft 12, and the number one reduction gear 6 is attached to the shaft 13.
A No. 2 reduction gear 17 is fitted into each of the two, and the lower end of the output gear 7 is supported by the bearing 14. A coil bobbin 8 is fitted onto the outer periphery of the magnetic pole 4b of the core 4, and a terminal holding portion 18 protrudes from the lower case 1 to the outside. An upper case 9 is stacked on top of these with the circular protrusion 9a facing the rotor and the flat plate 9b facing the gear, and the upper end of each shaft is fitted into the shaft hole. An output shaft 7a integrated with the output gear 7 is supported by a bearing 19 fixed to the upper case 9, and caulking protrusions 9c of the upper case 9 are fitted into a plurality of square holes 1c drilled around the lower case 1. It is caulked and fixed.

Grease is applied between the rotational direction regulating member 2 and the intermediate gear 3, and the rotational direction regulating member 2 is frictionally coupled using the viscosity of the grease, and the rotational direction regulating member 2 is formed with a pin 2a and a rotational direction regulating protrusion 2b. . pin 2a
faces the arc-shaped notch 4c of the lower core 4 and is prevented from rotating within the range of the notch 4c, and the rotation direction regulating protrusion 2b faces the rotation area of the engagement protrusion 5a of the rotor 5. The intermediate gear 3 is meshed with the pinion 5b of the rotor 5 and the first reduction gear 6. A second reduction gear 17, which meshes with the output gear 7, is meshed with the pinion 6a of the first reduction gear 6.

The lower core 4 has a lower core 4 facing downward.
Three legs 4d, 4e, 4e that regulate the height of the space formed between the magnetic pole 4b and the lower case 1.
is formed and placed on the bottom surface of the lower case 1, and two of the legs 4e, 4e have positioning protrusions 4f that fit into the square holes 1d, 1d of the lower case 1 as shown in FIG.
is formed. Further, the lower core 4 is formed with a guide portion 4g that abuts against the constricted portions 1e, 1e of the lower case 1 and guides the lower core 4 to a positioning position.

A jetty 8a is protruded from the upper and lower inner circumferences of the coil bobbin 8 and is sandwiched between the lower core 4 and the upper case 9, and a thick portion 8b and a groove 8c are formed on the outer periphery of the flange on one side, and a terminal is formed in the groove. 20 is press-fitted, and another jetty 8d is formed on the outer periphery of the other side flange on the side opposite to the thick wall portion 8b, and is brought into contact with the inner surface of the upper case 9.

A plurality of magnetic poles 9d are formed downward around the center of the circular convex portion 9a of the upper case 9.

The operation of the small motor is such that when the excitation coil wound around the coil bobbin 8 is energized and the rotor 5 is rotated clockwise in FIG. When rotated clockwise, the rotational direction regulating protrusion 2b is rotated into the rotational region of the engagement protrusion 5a, and when the two abut, the rotation of the rotor 5 is stopped.

Next, when the rotor 5 is rotated counterclockwise in the next phase of the alternating current supplied to the excitation coil, the rotation direction regulating member 2 is rotated clockwise, and the rotation direction regulating protrusion 2b is turned to the engaging protrusion. Since the rotor 5 does not collide with the rotor 5a, the counterclockwise rotation of the rotor 5 continues.
At this time, the pin 2a of the rotational direction regulating member 2 is brought into contact with one side of the arc-shaped notch 4c, and the rotation thereof is stopped.

When the small motor is configured as described above, the intermediate gear 3, the rotation direction regulating member 2, the lower core 4, the rotor 5, and the coil bobbin 8 are dropped into the rotor side recess 1a of the lower case 1, and the gear side It is only necessary to drop the first reduction gear 6, the second reduction gear 17, and the output gear 7 into the recess 1b, place the upper case 9 on top of them, and fix them by caulking, making assembly of the small motor extremely easy. , automatic assembly is also possible. Furthermore, the entire structure is thinner, and the size of the gear section side recess 1b is not restricted by the outer diameter of the rotor section side recess 1a, and is not restricted by the thickness due to the wheel train configuration that has a degree of freedom to satisfy the optimum conditions of the gear section. This allows the gear to have a shape that provides sufficient strength.

When the lower core 4 is further lowered, the guide part 4g
Since the constricted portion 1e is fitted into the constricted portion 1e, it becomes easy to fit the positioning convex portion 4f into the square hole 1d of the lower case 1 and to fit the shaft 10 into the shaft hole 4a of the lower core 4. It is difficult to fit together because the clearance must be small so that the caulking of the shaft 10 does not loosen due to impact when regulating the rotational direction of the rotor 5, but this drawback is due to the fact that the guide part 4
g and the long constricted portion 1e of the arc portion make it extremely easy to align and attach the lower core 4.

Also, the magnetic pole 4b of the lower core 4 and the magnetic pole 9 of the upper case 9
d is reliable because the interval is set between the lower case 1 and the upper case 9, and because the interval is not set at the coil bobbin 8, there is no need to strengthen the coil bobbin, and even if the coil bobbin 8 is deformed by heat. Since the distance between the magnetic poles 4b and 9d does not change, the characteristics of the motor are improved, the quality is stabilized, and the reliability is improved.

The case forms a constriction part 1e in the lower case 1,
Since the upper case 9 is formed of the circular convex portion 9a and the flat plate 9b, it will not be twisted in the middle.

Furthermore, since the jetty 8a around the inner side of the coil bobbin 8 is held between the lower core 4 and the upper case 9 and is not supported by the entire surface of the flange of the coil bobbin 8, it is easy to prevent rattling, and the upper case 9 is prevented from swelling, making it stable. The lower core 4 is fixed by the three legs 4 and is prevented from vibrating due to electromagnetic vibration.
Since the height is regulated and held by d, 4e, and 4e, no strong load is applied, so the thrust play of the intermediate gear 3 is stabilized. In addition, since the jetty 8d is provided on the outer periphery and a recess is formed on the outside of the flange, even if the flange swells somewhat due to the winding, the flange is easily deformed as the jetty 8d hits the inner surface of the upper case 2. Can be assembled.

In the above description, the rotor side recess 1 of the lower case 1
a and the gear part side recess 1b are formed in a figure 8 shape, but they may be formed in other shapes, such as an ellipse, and the constricted part 1
e may be formed in other shapes such as a truncated cone shape to guide the guide portion 4g to the positioning position.

Furthermore, although the lower case 1 is provided with a square hole 1c and the upper case 9 is provided with a caulking projection 9c, the lower case 1 may be provided with a caulking projection and the upper case 9 may be provided with a square hole.

Further, in the above description, the output shaft 7a was made to protrude toward the one side flat plate 9b of the upper case 9, but the output shaft 7a may be made to protrude toward the lower case 1 side. Further, the gear train may be configured by other combinations of wheel trains. The flat plate side is constructed on the assumption that a micro switch will be provided.

[Effect of idea]

As mentioned above, in the present invention, one of the two cases is formed with a concave portion accommodating a rotor portion and a gear portion side by side, and a core on which a magnetic pole facing the rotor is formed is formed in the concave portion on the rotor portion side. A pinion rotated by the rotor is disposed within the space, and the rotation of the pinion is transmitted to the gear through the space. Since the structure is configured so that the transmission is transmitted to the rotor section, the thickness of the motor can be made thin, and the gear section can be placed in a recessed section separate from the rotor section, allowing for a flexible wheel train configuration. Therefore, it is possible to provide a small motor that has excellent practical effects such as sufficient gear strength.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view of the lower case side of a small motor, Fig. 2 is a sectional side view of the small motor, Fig. 3 is a plan view of the small motor, and Fig. 4 5 is a sectional side view of the main parts of the legs of the lower core and the lower case, and FIG. 6 is a sectional side view of the conventional small motor. 1... Lower case, 1a... Rotor side recess,
1b...Gear part side recess, 4...Lower core, 8...
...Bobbin with coil wound, 9...Top case.

Claims (1)

[Scope of utility model registration request] In one of the two cases, a recess that accommodates a rotor part and a gear part is formed side by side, and in the rotor part side recess, a core formed with a magnetic pole facing the rotor is connected to the inner surface of the one case. A pinion rotated by the rotor is disposed within the space, and the rotation of the pinion is transmitted to the gear portion via the space. , a small motor formed by clamping and fixing a bobbin wound with a coil between the core and the other case.