JPH05272596A - Planetary gear type transmission device - Google Patents

Abstract

PURPOSE:To improve durability by integrally forming a transmission disk, a sun pinion, and planetary shafts with metal members, integrally forming another transmission disk, an output shaft, and planetary shafts with metal members, and incorporating the final reduction stage coupled with planetary pinions to the planetary shafts into an inner gear. CONSTITUTION:A sun pinion 2 is arranged on a transmission disk 1, a ring-like recess 6 is formed on the outer periphery of its bottom section, multiple planetary shafts 3 are arranged on the other face of the transmission disk 1, and a ring-like projection 5 connecting them is formed. The transmission disk 1, sun pinion 2, and planetary shafts 3 are integrally formed with metal members. Planetary pinions 8 are coupled with planetary shafts 11 to form a reduction stage B, an output shaft 10 is arranged on a transmission disk 9, the planetary shafts 11 are arranged on the other face of the transmission disk 9, and a ring- like projection connecting them is formed. The transmission disk 9, output shaft 10, and planetary shafts 11 are integrally formed with metal members. The final reduction stage A coupled with planetary pinions 12 to the planetary shafts 11 is incorporated into an inner gear 13. The abrasion of teeth is prevented, and the outflow of grease is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear type transmission device.

[0002]

2. Description of the Related Art In recent years, planetary gear type transmission devices, such as high torque general-purpose types, are used for auto blinds, auto shutters, robots, machine tools, etc., and compact types are used for carrying floppy discs and ticket vending machines. It is well known that it is widely used in various industrial fields such as door locks, ink adjustment for printing machines, etc.

The structure of a conventional general planetary gear type transmission device will be described with reference to FIG. A sun pinion 31 is arranged in the center of one surface of the conductive disk 30, and a plurality of, for example, three planetary shafts 32 made of metal members are press-fitted and fixed to the peripheral portion of the other surface at equal intervals. .. Three planet pinions 33 are fitted on the planet shaft, and the planet pinions 33 mesh with an input pinion 34 fixed to a drive shaft of a motor or the like to form one deceleration stage.

Next, an output shaft 36 to which an overload is applied is fixed to the center of one surface of the other conductive disk 35 by a knurl 37, and a plurality of output shafts 36 are equidistantly formed on the peripheral edge of the other surface, for example, Three
A planetary shaft 38 made of individual metal members is press-fitted and fixed. Three planet pinions 39 are fitted to the planet shaft 37, and the planet pinions 39 mesh with the sun pinion 31 to form a final reduction stage.

Further, the deceleration stage and the final deceleration stage are respectively incorporated in the inner gear 40, mesh with each other, and revolve around the sun pinion while rotating in the inner gear. The input on the stage side can be taken out to the final deceleration stage side as a desired output.

However, in the planetary gear type transmission device described above, the accuracy of the individual parts and the fixing means required for the respective constituent parts are long-time continuous or intermittent load operation, and loosening of the fixing part or the like causes slippage. In some cases, it is difficult to maintain the desired torque accuracy, the number of processing steps for the metal member described above is required, and there are problems such as a decrease in reliability and an increase in manufacturing cost.

Therefore, as conventional techniques for improving these problems, specific examples are disclosed in JP-A-55-163352 and JP-A-2-130685 previously filed by the present applicant.

First, the prior art disclosed in Japanese Patent Application Laid-Open No. 55-163352 is a planetary gear type transmission device mainly made of plastic, which aims at further reduction of manufacturing cost with light weight and low noise. There is a statement that it is.

The outline of the prior art disclosed in Japanese Utility Model Laid-Open No. 130685/1990 will now be described with reference to FIG. 7. The structure of the transmission device is the planetary gear type transmission device described with reference to FIG. Same as the above, but the transmission disk 50, the output shaft 51 and the three planetary shafts 52 are integrally molded with a ceramic material, and the planetary pinion 53 is fitted to the planetary shaft 52 to form the final reduction stage. ing. In addition, another conductive disk 54,
The sun pinion 55 and the three planet shafts 56 are also integrally formed of a ceramic material, and the planet pinion 57 is attached to the planet shaft 56.
To form one deceleration stage. Both the deceleration stage and the final deceleration stage are incorporated in the inner gear 58 and mesh with each other, and the input on the deceleration stage side is taken out to the final deceleration stage side as a desired output. There is a description that the desired functional precision is maintained over a long period of use and the manufacturing cost is reduced by integrally molding the main parts with a ceramic material to improve the processing precision.

[0010]

However, each of these prior arts has the following problems. In the prior art disclosed in Japanese Patent Laid-Open No. 55-163352 mentioned above, the main parts are made of plastic. Plastic material is a material that is distorted due to aging and temperature changes due to the operating environment.In addition, due to the accuracy of parts required for the parts that make up the transmission device and the fixing means, it can be used for long-term continuous or intermittent load operation. Physical and mechanical conditions to withstand, namely heat resistance,
There are problems such as difficulty in satisfying rigidity and tensile strength.

Further, in the prior art disclosed in the above-mentioned Japanese Utility Model Publication No. 2-130685, the transmission disk, the sun pinion and the planetary shaft which form the reduction gear stage are integrally formed of a ceramic material as shown in FIG. However, since the material of the planetary pinion of the final deceleration stage with which the sun pinion made of the above-mentioned ceramic material meshes is a brass material, the teeth of the planetary pinion will be worn or chipped during long-term load operation, causing a problem of reliability. was there. Grease is injected into the vicinity of the center of the planetary disk side of the conduction disk in the reduction gear stage and the final reduction gear stage, but the grease injected during long-term operation will flow out to the outside and maintain lubricity for a long time. However, there was a problem with durability. Furthermore, the planetary pinion of the final reduction stage that meshes with the sun pinion increases resistance because the plane part of the planetary pinion is in full contact with the plane of the conduction disc of the reduction stage that is integral with the sun pinion during operation. There was also the problem of reduced efficiency. In addition, when the sun pinion and the planetary pinion are meshed with each other, if the tooth profile of the sun pinion is not formed into a normal tooth profile up to the root of the tooth, there are many problems such that the meshing of the two is not performed normally. ..

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a planetary gear type transmission device having improved durability and low manufacturing cost.

[0013]

In order to achieve the above object, the structure of the planetary gear type transmission device according to the present invention is such that a sun pinion is arranged at the center of one surface of a conduction disk, and the sun pinion is arranged. A ring-shaped concave portion is formed on the outer periphery of the bottom portion of the conductive disk, a plurality of planetary shafts are provided on the peripheral edge of the other surface of the conductive disk, and a ring-shaped convex portion that connects the roots of the plurality of planetary shafts. The transmission disc, the sun pinion, and the planetary shaft are integrally formed by a metal member, and the planetary pinion is fitted to each of the plurality of planetary shafts. An output shaft is arranged at the center of one surface of the conductive disk, and a plurality of planet shafts are arranged at equal intervals on the peripheral portion of the other surface of the conductive disk. A ring-shaped convex portion that connects the roots is formed, and the conductive disc, the output shaft, and the planetary shaft are made of metal. A final deceleration stage formed by forming a body and fitting a planetary pinion to each of the plurality of planetary shafts with the planetary pinion of the final deceleration stage meshing with the sun pinion of the deceleration stage. By incorporating a gear stage and the reduction gear stage in the inner gear, the respective planetary pinions are mounted on the sun pinion, and
It is characterized in that it is installed in the inner gear and revolves around the sun pinion while rotating.

[0014]

Therefore, in the planetary gear type transmission device obtained by the present invention, during long-term operation, the teeth of the planetary pinion are prevented from being worn, the grease does not flow out near the center of the planetary shaft, and the resistance of the planetary pinion is small. , The planetary pinion fitted to the planetary shaft meshes with the sun pinion and also meshes with the inner gear to rotate around the sun pinion, revolving around the sun pinion and efficiently transmitting the input from the drive shaft for a longer period of time with higher accuracy. ..

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of a planetary gear type transmission device according to an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of FIG. 1, FIG. 3 is a plan view of an integrally molded product of a final reduction stage of FIG. 1, and FIG. Is a perspective view of the integrally molded product of the reduction gear stage of FIG. 1, and FIG. 5 is a partial sectional view of the vicinity of the sun pinion of FIG.

First, referring to FIGS. 1 to 5, the conductive disk 1, the sun pinion 2 and the three planetary shafts 3 are integrally formed by a metal member having a suitable hardness, such as pure iron. Mold. At that time, as shown in FIG. 3, if a so-called rice ball-shaped blind hole 4 in which a part of an arc is evenly connected by a straight line is formed on the shaft portion of the sun pinion, it is released from the molding die at the time of molding. However, the vacuum state can be eliminated, and the integrally molded product can be easily removed.

Further, as shown in FIG. 4, during integral molding,
By forming a thin ring-shaped convex portion 5 connecting the planetary shafts 3 at the base of the three planetary shafts 3, the grease injected near the center of the three planetary shafts flows out to the outside even during operation. And maintain lubricity for a long period of time. The ring-shaped convex portion is similarly formed in the final deceleration stage A described later.

Next, as shown in FIG. 5, at the time of integral molding, a ring-shaped recess 6-shaped groove is formed in the bottom of the sun pinion 2 and the bottom is formed into an R-shape 7. Helps prevent cracks during release from the mold, and the groove shape is a conductive disc 1
The contact area of the planetary pinion of the final deceleration stage A, which will be described later, can be reduced to reduce the resistance, and the groove shape can ensure a normal tooth profile up to the bottom of the sun pinion 2. Each of the integrally formed planetary shafts 3 has a planetary pinion 8
Are fitted to form the reduction gear B.

As described above, the number of integrally formed planetary shafts in this embodiment is three, but by forming the other three planetary shafts evenly at the positions where the radii of the centers of the conductive disks are different, It is possible to obtain outputs of different specifications with one integral molded product having a total of six planetary shafts in one set of three.

Further, as shown in FIG. 1, the output shaft 10 is formed in the center of one surface of the conductive disk 9 and the planetary shaft 11 is formed in the other surface thereof integrally with the above-mentioned metal member, for example, pure iron. To do.
It is the same that the roots of the three planetary shafts 11 are continuously formed by ring-shaped projections during molding. The planetary shafts 11 are fitted with planetary pinions 12 to form a final reduction stage A. In this embodiment, the metal member is integrally molded with pure iron, but the material is not limited to this, and the means for integrally molding is generally a metal injection molding method or the like.

As described above, the planetary gear type transmission device is completed by incorporating the reduction gear B and the final reduction gear A in the inner gear 13. Reference numeral 14 is an input pinion, 15 is a motor, 16 is a spacer, and 17 is an upper lid.

Therefore, the feature of this embodiment is that
As described above, the conduction disc and the sun pinion or the output shaft and the planetary shaft are integrally molded with pure iron or the like having an appropriate hardness to improve the processing accuracy, and at the same time, the planetary pinion teeth that mesh with the sun pinion are worn or chipped. Also, the ring-shaped convex part connecting the roots of the planetary shafts prevents the outflow of grease, and the ring-shaped concave part of the roots of the solar pinion reduces the contact resistance of the planetary pinion and the normal solar pinion. Secure the tooth profile to the root. Furthermore, the rice ball-shaped blind hole in the shaft of the sun pinion and the R shape of the bottom of the sun pinion are:
Good mold release conditions are used.

[0023]

As described above, according to the present invention,
Wear of the teeth of the planetary pinion, which is formed by integrally molding the main member with a metal member having a suitable hardness, for example, pure iron or the like,
By reducing chipping, the desired torque and accuracy are maintained even during long-term load operation, and the lubrication is maintained for a long time to improve durability by preventing grease from flowing out, and the contact area of the gear The reduction improves the rotation efficiency, and the securement of the bottom of the tooth profile maintains the meshing properly, and the reliability is improved. On the other hand, the manufacturing cost and management cost are reduced, and the quality is stable and the price is low. It is possible to provide a planetary gear type transmission device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a planetary gear type transmission device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a plan view of an integrally molded product of the final reduction gear stage of FIG.

FIG. 4 is a perspective view of an integrally molded product of the reduction gear stage of FIG.

5 is a partial cross-sectional view near the sun pinion of FIG.

FIG. 6 is a sectional view showing the structure of a conventional general planetary gear type transmission device.

FIG. 7 is a cross-sectional view showing the structure of a planetary gear type transmission device in which conventional main parts are integrally molded of a ceramic material.

[Explanation of symbols]

 1 Conduction Disc 2 Sun Pinion 3 Planetary Axis 5 Convex 6 Concave 8 Planetary Pinion 9 Conductive Disc 10 Output Axis 11 Planetary Axis 12 Planetary Pinion 13 Inner Gear

Claims (1)

[Claims] 1. A solar pinion is arranged in the center of one surface of the conductive disc, and a ring-shaped recess is formed on the outer periphery of the bottom of the solar pinion, and a peripheral portion of the other surface of the conductive disc is formed. A plurality of planetary shafts are arranged at equal intervals, and a ring-shaped convex portion that connects the roots of the plurality of planetary shafts is formed. The conductive disk, the sun pinion, and the planetary shaft are integrally formed of a metal member. , At least one reduction stage having a planetary pinion fitted to each of the plurality of planetary shafts, and an output shaft disposed at the center of one surface of the other conductive disk. A plurality of planetary shafts are arranged at equal intervals on the peripheral portion of the other surface of the plate, and formed into a ring-shaped convex portion that connects the roots of the plurality of planetary shafts,
The transmission disc, the output shaft, and the planetary shaft are integrally formed of a metal member, and a final reduction stage in which a planetary pinion is fitted to each of the plurality of planetary shafts is provided. By incorporating the final deceleration stage and the deceleration stage in the inner gear in a state of meshing with the sun pinion of the deceleration stage, each of the planetary pinions is exteriorly mounted on the sun pinion and is internally mounted on the inner gear. A planetary gear type transmission device, which revolves around the sun pinion while rotating.