JPH02129435A - Small size turn table using planetary gear type gear motor - Google Patents

Abstract

PURPOSE:To make a turn table thin in the axial direction, and make it possible to perform precise dividing, by providing an internal gear of a planetary gear type speed reducer on the turn table side, and providing an inner pin engaged with an external gear on a motor case side. CONSTITUTION:A turn table 24 is driven with a small size gear motor combined with a small thin type motor 21 and a planetary gear speed reducer. An inner pin 12' is fixed in one body or separated state on the case side of a flat motor 17. An external gear 10 is driven through an eccentric body 9, by driving the flat motor 17. As the inner pin 12' is fixed and the turn table 24 provided with an internal gear 8 is not fixed, circumferential difference due to difference of the number of teeth between the internal gear 8 and the external gear 10 is generated, and the internal gear side rotates at low speed. Thus, the extremely thin turn table in the axial direction can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a small turntable using a planetary gear motor which is compact and has a simple structure.

(Prior art) As a turntable coupling method, there are 1) direct coupling method;
2) internal gear coupling system and 3) internal planetary gear system are known.

Although the direct coupling method (1) is structurally simple, it has the problem that it is difficult to obtain large torque at low speeds.

In the internal gear coupling system 2), as shown in the third riA, a motor shaft 22 and a pinion 23 fixed to the motor shaft 22 are coupled by a motor 21. The pinion 23 meshes with an internal gear 25 provided on the turntable 24.

Thus, the turntable 24 is moved around the center pole 26 fixed to the frame.

This internal gear coupling method is unfavorable in terms of shape because the input shaft and output shaft are largely eccentric.

Next, the internal planetary gear system 3) is based on the principle of the internal planetary gear reducer shown in No. 411, and is made thin and compact as shown in FIG. The internal planetary gear reduction gear will be briefly explained below with reference to FIGS. 4 to 6, and the small gear motor will be explained with reference to FIG.

FIG. 4 shows a conventionally known planetary gear reducer with a large transmission torque, where 1 is an input shaft and 2 is an output shaft, which are located on a common center line. The input shaft 1 is supported by a rolling bearing 4 on a fixed casing 3 and a rolling bearing 6 on a carrier 5 integrated with the output shaft 2, and the output shaft 2 is supported by a rolling bearing 7 on the fixed casing 3. . This casing 3 includes a cover 38 on the input shaft 1 side and a cover 3b on the output shaft 2 side.
and an annular frame 3c between them. In this annular frame 3c, external pins as teeth of the internal gear 81 are held at predetermined positions at a constant pitch.

On the input shaft 1, a pair of eccentric bodies 9a and 9b are arranged at 18
The external gears 10a and 10b are mounted on these eccentric bodies 9a and 9b with a phase difference of 0.00.
1a and llb. This external gear 1
Pin holes 13a, 13b having a diameter twice the sum of the diameter of the carrier pin 12 and the amount of eccentricity of the eccentric bodies 9a, 9b are bored at predetermined positions in the pin holes 13a, 10b. A series of carrier pins 12 are inserted into 13b, which are provided integrally with the carrier 5 and have bushings fitted therein. Therefore, when input shaft 1 is continuously operated, input shaft 1
External gear 10 is rotated by eccentric bodies 9a and 9b as the external gear 10 rotates.
a and 10b perform eccentric rotational motion, but the orbital motion is absorbed by the pin holes 13a and 13b, resulting in the external gear 10a.

Only the rotation of the tob is transmitted to the output shaft 2 via the carrier pin 12.
is extracted as the rotation of

This type of planetary gear reducer has a large transmission torque, so 1
Usually gears, bearings, casings, etc. are all made of metal.

However, in the case of small and light load applications where the transmitted torque is not so large, it is not necessarily made of metal, but can also be used molded from plastic material (Utility Model Opening No. 62-2
(See Publication No. 00J139).

5 and 6 show a thin planetary gear reducer made of synthetic resin disclosed in the above-mentioned publication, and the basic operating principle is the same as the known example shown in FIG. 4.

FIG. 7 shows an example of a small gear motor for turntable coupling using a thin planetary gear reducer made of synthetic resin as shown in FIGS. 5 and 6, and combining this with a flat motor. 16 is a metal motor shaft of a flat motor 17. This motor shaft 16 is also the input shaft of a planetary gear reducer 18 combined with a flat motor 17. Output shaft 2
is supported by a bearing 20 within the boss portion 19 of the casing 3.

The planetary gear reducer 18 includes an eccentric body 9 that is eccentric by e with respect to the axis at the end of an input shaft 16 that also serves as a motor shaft. The eccentric body 9 is fitted into a fitting hole 14 at the center of the external gear 10. The external gear 10 has (n-1) external teeth, and is provided with a fixed casing 3 that rotatably supports the input shaft 16 and the output shaft 2, which will be described later.

The casing 3 is fixed to a flat motor 17, and an internal gear 8 having a number of teeth (n) is formed on its inner peripheral surface.

The external gear 10 is internally meshed with the internal gear 8, and a plurality of pin holes 13 are formed concentrically in the external gear 10, and a carrier pin 12 is loosely fitted into each of the pin holes 13. has been done. The carrier pin 12 is provided integrally with the output shaft 2. The input shaft 16 is rotatably supported by a bearing at the center of the flat motor 17.

As is clear from FIG. 7, the support bearing portion of the output shaft 2 has become very large (L in FIG. 7), and the flat motor 17.
Even if the small planetary gear reducer 18 is combined, if the bearing portion of the output shaft becomes large, it is impossible to reduce the overall thickness of the turntable, which is a problem.

(Problems to be Solved by the Invention) In view of the problems of the prior art, it is an object of the present invention to provide a small turntable that is compact in shape and uses a simple and thin small motor with an internal planetary gear reducer. be.

(According to the invention. Solution to Problem 91) In a turntable whose coupling mechanism is a small gear motor that combines a small thin motor and a planetary gear reducer, the output shaft of the motor is coaxial with the input shaft of the planetary gear reducer, and the input An eccentric body is provided on the shaft, and this eccentric body is fitted into a fitting hole provided in the center of the external gear, and the external gear is internally meshed with the internal gear provided on the turntable, and the external gear An inner pin provided in the motor case portion was loosely fitted into a pin hole formed in the gear.

Further, the turntable and the motor case are loosely fitted by engagement between the circular protrusions and the circular grooves.

(First Example) This will be explained based on FIG. 1. In Figure 1, 16 is the motor shaft;
17 is a small flat motor. An eccentric body 9 is fixed to the left end of the motor shaft 16 which is supported by a bearing 16a, and the eccentric body 9 is fitted into a fitting hole 14 provided at the center of the external gear 10. The external gear 10 is formed with external teeth of a trochoid curve having a number of teeth (n-1), and meshes with the internal gear 8 provided on the turntable 26 . turntable 26
is rotatably supported by a bearing 29 attached to the flat motor 17.

12' is an inner pin corresponding to the carrier pin 12 in FIG. 7, and is fixed to the case side of the flat motor 17 either integrally or separately. The inner pin 12' is located on a circle centered on the motor shaft 16, and is loosely engaged with the pin hole 13 of the external gear 10. The circle in which the inner pins 12' are arranged is the pin hole 1.
3 has the same radius as the arranged circle, and the diameter of the inner pin 12' is .

The pin hole 13 is exactly 2e, which is twice the eccentricity e of the eccentric body 9.
smaller.

If the flat motor 17 is operated with this structure.

The external gear 10 is connected via the eccentric body 9, but the inner pin 1
2' is fixed, and a turntable 26 is provided with an internal gear 8.
is not fixed as in the conventional planetary gear system, so the internal gear side rotates at low speed with a circumferential difference equal to the difference in the number of teeth of the external gear 1o.

As described above, in the present invention, a thin planetary gear reducer is coaxially and directly connected to a small, flat-shaped motor 17.

We were able to obtain a small turntable with an extremely compact structure in the axial direction. As for the material.

The components can be made of synthetic resin material, similar to those found in small planetary gear systems.

In this embodiment, the difference in the number of teeth between the external gear 10 and the internal gear 8 is one, but it may be two or more.

(Second embodiment) This will be explained based on FIG. 2. Turntable 24 in Figure 1
is made rotatable by a bearing 27, whereas in this embodiment,
A circular protrusion 28 is integrally provided on the motor case side of the flat motor 17, and a circular groove 29 is provided on the turntable 24 side corresponding to the circular protrusion 28.

In this way, the circular protrusion 28 always rotates in sliding contact with the circular groove 29, and sliding friction is always generated in this portion. Since the engaging portion has a sliding friction braking function in this way, the stop function of the turntable can be increased and controllability can be improved.

Furthermore, if the motor is a control motor, since there is a brake at the output section, it has high stopping performance and is suitable as a small and simple precision indexing board. If a synthetic resin material is used at least for the uneven sliding contact portion, it is possible to obtain suitable indexing performance due to slipperiness and appropriate tightness.

The small turntable as described above is, for example, a small indexing board or a turntable for a (microwave) oven.

It can be applied as a rotating device for Chinese food, a rotating TV stand, a computer display stand, a rotating ornamental table, a 9-turn clothes storage hanger, a connecting device, or a ceiling-mounted indoor layer.

(Effects) A small motor and a small planetary gear reducer are combined, and the internal gear of the planetary gear reducer is provided on the turntable side, and the inner pin that engages with the external bracket gear is provided on the motor case side. A turntable that is extremely thin in the axial direction can be obtained.

Since the turntable and motor case are in continuous sliding contact with each other through a concave-convex engagement, this part has a braking function.
Since the stopping performance of the turntable is improved, accurate indexing becomes possible. At the same time, smooth rotation is also guaranteed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of a turntable according to the present invention. FIG. 2 is a sectional view of the second embodiment. Figure 3 shows a known internal gear type turntable coupling device'. Figure 4 shows a known planetary gear reducer. Figure 5 shows a thin planetary gear reducer made of a known synthetic resin. FIG. 6 is a sectional view taken along line VI-Vl in FIG. Figure 7 shows an internal planetary gear type turntable coupling device. In the figure: 1 Human power shaft 2 Output shaft 3 Casing 3a Cover 3b Cover 30 Annular frame 4 Bearing
5 carrier 6 bearing 7 bearing 8 internal gear 9a, 9b eccentric body 10.
10a, 10b External gear 11a, llb Bearing 12 Carrier pin 12' Internal pin 13, 13a, 13b
Pin hole 14 Fitting hole 15 Shaft hole motor shaft 16a Bearing (small) flat motor planetary gear reducer 19 Boss portion bearing 21 Motor motor shaft 23 Pinion turntable 25 Internal gear center pole 27 Bearing circular convex line 29 Circular concave groove or more Applicant Sumitomo Heavy Industries, Ltd. Sub-Agent Patent Attorney Rikizutsu Ohashi Figure 1 Figure 2 Figure 4 Figure Figure ■ Figure

Claims (1)

[Claims] 1) In a turntable whose coupling mechanism is a small gear motor that is a combination of a small thin motor and a planetary gear reducer, the output shaft of the motor is coaxial with the input shaft of the planetary gear reducer, and the input shaft is is provided with an eccentric body, the eccentric body is fitted into a fitting hole provided in the center of the external gear, the external gear is internally meshed with the internal gear provided on the turntable, and the external gear A small turntable using a planetary gear type gear motor, characterized in that an inner pin provided in the motor case portion is loosely fitted into a pin hole formed in the gear. 2) A small turntable using a planetary gear type gear motor according to claim 1), wherein the turntable and the motor case are loosely fitted by engagement between a circular protrusion and a circular groove.