JPH03272348A - Internal contact meshing type planetary gear speed reducer - Google Patents

Abstract

PURPOSE:To improve interchangeability of a part, to reduce generation of vibration and noise, and to match selection of a material with a purpose by a method wherein an internal gear is not formed integrally with a casing and other part but is of independent structure being a different body. CONSTITUTION:In a planetary gear increase and reduction device, rotation of an input shaft 21 produces reduced rotation of an output shaft 22 to take it out. But, it is also possible that the output shaft 22 is fixed and reduced rotation is taken out from an internal tooth gear 27 or otherwise input rotation to the output shaft 22 are increased to take it out from the input shaft 21. The internal gear 27 of plastic is formed in an annular shape and different from a casing 29 on the one side and of independent structure. An arcuate tooth shape 28 making internal contact with and engaged with an external tooth 25 of an external gear 24 is formed in the inner periphery of the internal gear. The internal gear is contained in casings 29 and 30, and a protrusion 27A is engaged with a recessed part 30A of the outer casing 30 and brought into a non-rotatable state. This constitution enables the use of the internal gear and other reduction gear in common.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention consists of an internal gear having a circular arc tooth profile, and an external gear having a trochoidal tooth formation consisting of an ebitrochoid parallel curve, a circular arc tooth profile, etc. In addition, the external gear is rotated by the rotation of an eccentric body fitted to the external gear, and both the inner and outer gears are internally meshed to decelerate (or speed up) the input rotation and output it. Regarding the improvement of the meshing type planetary gear reducer, more specifically, since the internal meshing type planetary gear reducer is made of plastic, it can be made smaller and lighter, and at the same time, the number of parts can be reduced, it is compact, low cost,
It relates to a structure that achieves high productivity.

(Prior Art) Various reduction gears using an internal meshing type planetary tooth* mechanism have been proposed. Among these reducers, the internal gear has a circular arc tooth profile made of a pin or a combination of a pin and a roller, and the external gear has a trochoid tooth profile made of an ebitrochoid parallel curve. The inner pin and inner roller are loosely fitted, and the rotation of the eccentric body fitted to the external gear causes the external gear to oscillate and rotate, causing both the inner and outer gears to engage internally to decelerate the input rotation and output. The internal mesh type planetary gear reducer is famous as the "cyclo reducer" (registered trademark). Since this cyclo-reduction ff1J is capable of transmitting large torque and has a large reduction ratio, it is used as various reduction mechanisms.

On the other hand, the cyclo reducer (hereinafter referred to as an internal meshing type planetary gear reducer) is made smaller and lighter, and at the same time reduces the number of parts. is also publicly known. (Refer to Japanese Utility Model Application Publication No. 63-30648) This plastic internal mesh type planetary gear reducer is relatively flexible because the plastic material is flexible and has good sliding characteristics. This ensures smooth rotation and smooth torque transmission.

For this reason, the plastic internal meshing type planetary gear reduction method has become a very effective product as a reduction rotating part for household electrical appliances, office equipment, vending machines, etc.

An example of the known plastic internal mesh type planetary gear reducer will be explained below with reference to FIGS. 8 and 9.

FIG. 8 is a cross-sectional view showing an example of an internal meshing type planetary gear reducer, and FIG. 9 is a cross-sectional view taken along the line A-Ill in FIG. 8.

In this example, the rotation of the input shaft 1 is taken out as decelerated rotation of the output shaft 2, but it is also possible to fix the output shaft 2 and take out the decelerated rotation from the internal teeth II7. can.

An eccentric body 3 is integrally formed with an input shaft 1 made of plastic. An external gear 4 made of plastic is fitted into the eccentric body 3. This external gear 4 has external teeth 5 having a trochoidal tooth profile integrally formed on its outer periphery. An internal pin 6 is integrally formed with the external gear 4. The inner pin 6 is formed to protrude from the side surface of the external gear 4 toward one side. The internal gear 7 made of plastic has an integral structure with a side wall casing on one side and also serves as the casing.
Moreover, the internal gear 7 is not rotatable in this example. A circular arc tooth profile 8 that internally meshes with the external tooth 5 of the external gear 4 is integrally formed on the internal tooth 1\L7. A disk-shaped flange 9 is integrally formed at the end of the output shaft 2 made of plastic 7, and an inner pin hole 10 into which the inner pin 6 is inserted is formed in the flange 9. The input shaft is rotatably supported in a bearing hole 11 formed at the end of the output shaft 2.

To explain the operation of the internally meshing type planetary gear reducer configured as described above, rotation of the input shaft 1 appears as oscillating rotation of the external gear 4 via the eccentric body 3. The oscillating rotation of the external gear 4 becomes a decelerated rotation of the flange 9 via the inner pin 6, and the decelerated rotation of the flange 9 is taken out from the output shaft 2.

(Problems to be Solved by the Invention) The above-mentioned known plastic internal mesh type planetary gear reducer had the following technical problems.

In the conventionally known plastic internal gear planetary gear transmission, the internal gear has an integral structure with the casing on one side. Therefore, when using a progressive reduction ratio, the casing also had to be changed, which caused problems in terms of parts management and parts sharing.

Also, since the internal gear and casing are integrated,
Impacts caused by the meshing due to manufacturing errors are transmitted directly to the casing, reducing the durability of the casing and causing vibration and noise.

Furthermore, since the internal gear is molded integrally with the casing, mold design is limited, and the dimensional accuracy of the product is also not very good.

Furthermore, the material required for the casing is rigidity, whereas the material required for the internal gear is sound deadening, lubricity, etc., so it has been impossible to select a material that suits each purpose.

Therefore, the purpose of the present invention is to improve the commonality of parts by adding a U. to an internally meshing type planetary tooth AM structure made of plastic.
To provide an internally meshing type planetary gear speed reducer which reduces vibration and noise and allows material selection to be tailored to the purpose.

(Means for Solving the Problems) The main feature of the present invention is that the internal gear is not integrated with the casing or other parts, but is a separate independent structure.

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a planetary gear speed increaser/reducer showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line BB in Figure $1.

In this embodiment, the rotation of the input shaft 21 is extracted as decelerated rotation of the output shaft 22. However, it is possible to fix the output shaft 22 and extract the decelerated rotation from the internal gear 27. Alternatively, the rotation input from the output shaft 22 may be accelerated and taken out from the input shaft 21.

The input shaft 21 made of plasti/resi has a disc-shaped eccentric body 2.
3 are integrally formed. The externally toothed wheel 24 made of plastic has a disk shape, and the externally toothed gear 24 is fitted into the eccentric body 23. External teeth 25 having a trochoidal tooth profile are integrally formed on the outer periphery of the external gear 24.

A plurality of internal pins 26 are integrally formed on the external gear 24. The inner pin 26 is formed from the side surface of the external gear 24 so as to protrude from the side of the external gear 24 . Internal gear 27 made of plastic
is ring-shaped and has an independent structure that is separate from the ke 29 on one side, and on its inner periphery there is a circular tooth profile 28 that internally meshes with the external teeth 25 of the external gear 24. are integrally formed. The internal gear 27 is housed in two casings on one side and an outer casing 30 on the other side.

The two casings on one side made of plastic include an annular side wall portion 29A, a cylindrical portion 29B that is integrally formed on the outer periphery of the side wall 1i29A and comes into contact with the internal teeth 1127, and an inner periphery of the side wall portion 29A. It consists of a cylindrical sleeve receiving part 29C integrally formed with. The outer casing 30 is fitted around the outer periphery of the internal gear 27.

A protrusion 27A is partially formed on the side surface of the internal gear 27. The protrusion 27A is fitted into a four part 30A partially formed on the outer casing 30, thereby making it unrotatable. The outer casing 30 includes an annular side wall 30B and a cylindrical portion 30C integrally formed on the outer periphery of the side wall 30B, and the input shaft 21 is pivotally supported through the side wall 30B. A disk-shaped flange 31 is integrally formed on the liJg of the output shaft 22 made of plastic, and the inner pin 26 is inserted through the flange 31, and an inner pin hole 32 is formed therein. Input shaft 21
The end of the input shaft 21 is inserted into a bearing hole 33 formed at the end of the output shaft 22, and the end of the input shaft 21 is rotatably supported by the output shaft 22.

To explain the operation of the internally meshing type planetary gear speed reducer which is an embodiment of the present invention configured as described above, the input shaft 21
The rotation appears as an oscillating rotation of the external gear 24 via the eccentric body 23.

The oscillating rotation of the external gear 24 transmits torque to the inner pin hole 32 of the flange 31 via the inner pin 26, thereby causing the flange 31 to rotate at a reduced speed. The decelerated rotation of the three flanges is then extracted from the output shaft 22.

The third gear is a multi-stage internal meshing type planetary gear reducer of the present invention, and has a disk-shaped eccentric body 42 integrally formed with an input shaft 41 made of plastic 7. First external tooth made of plastic @Hayabusa43. is disc-shaped, and the first external gear 43. is fitted into the eccentric body 42. External teeth 441 having a trophite tooth profile are integrally formed on the outer periphery of the first external gear 43□. First external gear 43. A plurality of inner pins 45 are integrally formed in the. Inner pin 45. The beam height is formed from the side surface of the J's 1 outer S gear 431 to one side. The first internal gear 461 made of plastic is ring-shaped and has the first external gear 43 on its inner periphery! external teeth 44. A circular arc tooth profile 47. are integrally formed. First internal gear 46. A protrusion 431 is partially formed in the outer casing 49, and the protrusion 481 fits into a recess 49A partially formed in the outer casing 49 made of plastic, thereby making it impossible to rotate. A first flange 501 made of plastic is rotatably supported on the input shaft 41, and an inner pin hole 511 and an eccentric body 52 are integrally formed in the flange 501. Said inner pin 45. is an inner pin hole 51. formed in the first flange 50. It is inserted into V・ru.

First flange 50. and the input shaft 4 through the eccentric body 52.
1 is provided. A second external gear 43° made of plastic is fitted into the eccentric body 52. The second
External gear 43. A plurality of inner pins 45 are integrally formed.

Inner pin 45. is the second external gear 43. One side is formed from the side to the other side. The second internal gear 46 □ made of plastic is ring-shaped, and has arcuate tooth shapes 47 . are integrally formed. Second internal gear 4
A protrusion 482 is partially formed on the first internal gear 46□, and the protrusion 43 becomes unrotatable by fitting into the fourth part 49B partially formed on the side surface of the first internal gear 46□. There is. A disc-shaped second flange 502 is integrally formed at the end of the output shaft 53 made of plasti.
An inner pin hole 51° is formed into which the inner pin 45 is inserted. The end of the input shaft 41 is inserted into a bearing hole 54 formed at the end of the output shaft 53, and the end of the input shaft 41 is rotatably supported by the output shaft 53.

The embodiment of the present invention constructed as described above: the multi-stage inscribed @mold planetary tooth table deceleration function operates as follows.

The rotation of the input shaft 41 appears as an oscillating rotation of the first external gear 431 using the eccentric body ↓2.

The oscillating rotation of the first external gear 431 is caused by the inner pin 45
1 through the inner pin hole 51. of the first seven rungs 501. 7 run 50) performs deceleration rotation. 1st 7 runs 50. The deceleration rotation causes the eccentric body 52 to swing and rotate the second external gear 432, and the second external gear 43. The oscillating rotation of the inner pin 45. via the second flange 50. Torque is transmitted to the inner pin hole 5], thereby causing the flange 50- of @2 to perform deceleration rotation. This rotation of the second flange 502 is extracted as a decelerated rotation of the output shaft 53.

4 and 5 show another embodiment of the present invention, in which the inner pin 62 integrally formed on the external gear 61 is replaced by an inner pin 64 formed on the outer casing 63.
is inserted into.

The internal gear 65 that meshes with the external gear 61 is ring-shaped and has an independent structure. A protrusion 65A is provided on the side surface of the internal gear 65, and the protrusion 65A is fitted into a recess 67A formed on the outer periphery of a flange 67 formed at the end of the output shaft 66, whereby the internal gear 65 It is attached to the flange 67. A casing 68 on one side is fitted into the outer casing 63, and the casing 68 on one side has a bearing portion 68A that supports the output shaft 33.

In this embodiment, the rotation of the six input shafts is transmitted through the eccentric body 70 as the oscillating rotation of the external gear 61, and the external gear 61 appears as the reduced rotation of the internal gear 65, which is then output. The shaft 66 rotates at a reduced speed integrally with the internal gear 65.

6 and 7 show still another embodiment of the present invention. In this embodiment, external teeth 72 are formed on the outer periphery of a flange integrally formed on an input shaft 71 to form an external gear 73. ,
Internal teeth $77 are attached to a rocking body 76 which is fitted into an eccentric body 75 integrally formed with an input shaft 74 so as to be rotatable. An inner pin 78 is integrally formed with the rocking body 76, and the inner pin 78 is inserted into an inner pin hole formed in the outer casing 79. A protrusion 77A is formed on the side surface of the internal gear 77, and the protrusion 77A is fitted into a recess 76A formed near the outer periphery of the oscillating body 76, thereby fixing the internal gear 77 to the oscillating body 76. A casing 81 on one side is fitted into the outer casing 79, and a cylindrical bearing portion 81A on which an output shaft is supported is formed in the casing 81 on one side.

In this embodiment, the rotation of the input shaft 74 appears as a deceleration rocking rotation of an internal gear 77 provided on a rocking body 76 via an eccentric body 75, and the rocking rotation of the internal gear 77 is Teeth $
73 deceleration rotation. The decelerated rotation of the external gear 73 is then extracted from the output shaft 71.

As explained above, in the present invention, since the internal gear has an independent ring-shaped structure, it is possible to reduce impact and improve product precision. However, the present invention is not limited to the above embodiments. There is nothing like that. For example, when attaching an independent internal gear to a casing or the like, the attachment is not limited to fitting between a protrusion and a recess, and other attachments also include structures.

Furthermore, in each of the above embodiments, the internally meshing type planetary gear reduction gear can also be increased in speed by replacing the input shaft and the output shaft, so the present invention is not limited to continuous transmission.

(Effects of the Invention) The effects of the present invention, which is constructed and operated as described above, are as follows.

In the present invention, the internal gear has an independent structure that is separate from the casing on one side, so when using a progressive reduction ratio, there is no need to replace the casing on the one side, making parts management easier. Not only is this easy, but the internal gear can also be used in common with other reduction gears. Therefore, manufacturing costs can be reduced.

Also, since the internal gear and casing are separate,
Even if an impact occurs due to meshing due to manufacturing errors, this impact is absorbed locally by the internal gear attachment, and is not directly transmitted to the casing. Therefore, the durability of the casing is improved, and vibration and noise are also reduced.

Furthermore, since the internal gear is ring-shaped, there are no restrictions on mold design, and the dimensional accuracy of the product is improved.

Furthermore, the material required for the casing is rigidity, whereas the material required for the internal gear is sound deadening, lubricity, etc., so it is possible to select a material that suits each purpose.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an internally meshing type planetary gear speed reducer showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line BB in FIG. FIG. 3 is a cross-sectional view showing a multi-stage internal mesh type speed reducer according to the present invention. FIG. 4 is a sectional view showing an internally meshing type planetary wheel speed increasing/decelerating rock according to another embodiment of the present invention, and FIG. 5 is a sectional view taken along the line CC in FIG. 4. FIG. 6 is a cross-sectional view showing still another inscribed single-channel speed increaser/decelerator of the present invention, and FIG. 7 is a cross-sectional view taken along line DD in FIG. 6. FIG. 8 is a sectional view showing a conventionally known plastic internal meshing type planetary gear reducer, and FIG. 9 is a cross-sectional view taken along A-A in FIG.
FIG. 1: Input shaft 22: Output shaft 23: Eccentric body 4: External gear 25: External tooth 26: Inner pin 7: Internal tooth $ 28: Casing on one side of arc tooth profile 9 29A: Side wall portion 9B: @-shaped portion 29C: Bearing part 0: Outer casing 30A: Recessed part OB = side wall part 30C: Cylindrical part 1: Flange 32: Inner pin hole 33: Output shaft 1: Input shaft 42: Eccentric body 3 43,: External gear 411: Outside Teeth 5145°: Inner pin 6, 46. : Internal gear 72.47°: Arc tooth profile 4 S, 48, +Protrusion 9: Outer casing 49A: Recess 9B: Recess 50. 50. : Flange 1151°: Inner pin hole 52: Eccentric body 3: Output shaft 54: Bearing hole 61: External gear 2: Inner pin 63: Outer casing 4 Inner pin hole 65: Internal gear 65A: Protrusion 6 Output shaft 67: Flange 67A: Casing on one side of recess 8 68A: Bearing portion 9, input shaft 70: Eccentric body 71:
Output shaft 2 External tooth 73: External gear 74: Input shaft 5 Eccentric body 76: Rocking body 76A: Four parts 7 Internal gear 77
A: Protrusion 78: Inner pin 9 Outer casing 80: Casing on one side of inner pin hole 1 81A: Tsumugi Uke Department sub-agent patent attorney Tsuji Sanbetsu Figure 1 Figure 3 Figure 2Wi Figure 4 Figure C'' Figure 6

Claims (3)

[Claims] (1) In an internally meshing planetary gear speed reducer made of plastic, an input shaft is integrally formed with an eccentric body, an external gear is fitted to the eccentric body, and an external gear is integrally formed with the external gear. a ring-shaped internal gear that meshes with the external gear; an output shaft having a flange formed at the end thereof; and an internal pin hole formed in the flange and into which the internal pin is inserted;
An internally meshing type planetary gear speed increase/deceleration comprising: a casing on one side having a bearing portion that supports the output shaft; and an outer casing into which the casing and the internal gear are fitted. Machine. (2) In an internally meshing planetary gear speed reducer made of plastic, an input shaft with an integrally formed eccentric body, an external gear fitted with the eccentric body, and an external gear integrally formed with the external gear a flange integrally formed at the end of the output shaft; a ring-shaped internal gear held on the outer peripheral side of the flange and meshed with the external gear; and a ring-shaped internal gear supporting the output shaft. An inner casing comprising a casing on one side having a bearing portion, an outer casing fitted with the casing on one side, and an inner pin hole formed in the outer casing into which the inner pin is inserted. Intermeshing type planetary gear speed reducer. (3) In an internally meshing planetary gear speed reducer made of plastic, the input shaft has an integrally formed eccentric body, a rocking body fitted to the eccentric body, and internal teeth attached to the rocking body. a gear; an inner pin integrally formed with the rocking body;
an external gear that is integrally formed at an end of the output shaft and meshes with the internal gear; a casing on one side that has a bearing that supports the output shaft; and an outer casing that fits with the casing on the one side. an internally meshing planetary gear speed reducer, comprising: an inner pin hole formed in the outer casing, into which the inner pin is inserted;