WO2019181965A1

WO2019181965A1 - Reduction gear and method for manufacturing reduction gear series

Info

Publication number: WO2019181965A1
Application number: PCT/JP2019/011548
Authority: WO
Inventors: 国弘原口
Original assignee: 株式会社ニッセイ
Priority date: 2018-03-22
Filing date: 2019-03-19
Publication date: 2019-09-26
Also published as: JP2019167967A

Abstract

[Problem] To obtain a reducer and a method for manufacturing a reducer series with which the increase in the number of components can be minimized and the size in an axial direction can be reduced. [Solution] A method for manufacturing a reduction gear series configured including: an orthogonal-shaft reduction gear 100 having a first reducer 1 that has a hollow input shaft 14a, a second reducer 2 composed of a bevel gear 41 provided to the input shaft 14a and a bevel pinion 42 that meshes with the bevel gear 41 and rotates about an axis O3 orthogonal to an axis O1 of the input shaft 14a, a casing 3 that houses the second reducer 2, and a tubular member 4 that is secured to the casing 3 and that coaxially passes through the input shaft 14a and the bevel gear 41; and a parallel-shaft reduction gear configured using members having the same shapes as an internally toothed gear 11, an externally toothed gear 10, and a carrier 13 used in the first reducer 1; said manufacturing method characterized in that the parallel-shaft reduction gear is configured using an input shaft of which the shape of an eccentric part is the same as that of the input shaft 14a used in the orthogonal-shaft reduction gear 100, and which has greater axial length than the input shaft 14a.

Description

Reducer and method of manufacturing reducer series

The present invention relates to a reduction gear capable of reducing the axial size of the device and a method of manufacturing the reduction gear series.

Conventionally, Patent Document 1 discloses an eccentric peristaltic power transmission device having a hollow input shaft. The rotation input to the input shaft is decelerated by the power transmission device and transmitted from the first flange to the counterpart machine. Further, the lubricant inside the apparatus is sealed by four oil seals (173A to 173D).

Further, Patent Document 2 discloses an orthogonal shaft type power transmission device incorporating a second reduction gear which is an eccentric rocking planetary gear reduction gear. The second reduction gear device includes an input shaft having a hollow portion. A bevel gear is fixed to the input shaft. The cylindrical member penetrates the inside of the input shaft, and the inside of the apparatus is sealed by an oil seal (88) provided between the cylindrical member and the second member connected to the carrier.

International Publication No. 2006/085536 JP 2013-199981 A

According to the drawing of Patent Document 2, it is considered that a speed reducer similar to the speed reducer disclosed in Patent Document 1 is incorporated. That is, the speed reducer disclosed in Patent Document 1 corresponds to the second speed reducer 18 in Patent Document 2, and according to FIG. 1 of Patent Document 2, the oil seals 173A and 173B of FIG. , 173D, the oil seal is removed.

However, according to the invention of Patent Document 2, in order to seal between the input shaft 34 and the cylindrical member 82, the second member 22 is added to the output side of the second carrier 56, and the second member 22 and the cylinder are added. An oil seal 88 is provided between the cylindrical member 82. In other words, the speed reducer disclosed in Patent Document 1 can directly connect the counterpart machine to the first flange (carrier), but a speed reducer similar to the speed reducer can be used in the apparatus disclosed in Patent Document 2. When assembled, the second member 22 must be added. For this reason, there is a problem that the number of parts increases and the size of the apparatus in the axial direction increases.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reduction gear and a reduction gear series manufacturing method capable of reducing the number of parts and reducing the size of the device in the axial direction. And

In order to achieve this object, a reduction gear according to claim 1 is a reduction gear connected to the case, a reduction gear having a hollow input shaft, and an output portion. An input gear fixed to one end of the input shaft, a cylindrical member having one end fixed to the casing, and coaxially passing through the input shaft and the input gear, the output portion, and the cylindrical member And a seal member disposed between the other end of the first and second ends.

Further, the speed reducer according to claim 2 is the speed reducer according to claim 1, wherein the speed reduction portion is further packaged by an internal gear and an eccentric portion provided on the input shaft, and the internal gear. An eccentric peristaltic reduction gear having an external gear that is inscribed in mesh with the gear and a carrier member that pivotally supports the input shaft and outputs the revolving motion of the external gear, wherein the carrier member is the output portion. It is also characterized by serving.

Moreover, the speed reducer according to claim 3 is the speed reducer according to

claim

1 or 2, and further, the output portion is more than the other end of the cylindrical member in the rotation axis direction of the input shaft. It is characterized by protruding.

Moreover, the reduction gear of Claim 4 is a reduction gear of any one of Claim 1 to 3, Comprising: Furthermore, the internal diameter of the spigot of the said output part and the outer diameter of the said sealing member are equal It is characterized by this.

A reduction gear series manufacturing method according to claim 5 is the reduction gear according to claim 1, wherein the input gear is a bevel gear and a first gear used for the first reduction gear. A method of manufacturing a speed reducer series including a gear, an external gear, and a second speed reducer configured using a member having the same shape as the carrier member, the step of manufacturing the first speed reducer; And a step of manufacturing the second speed reducer using a second input shaft having the same eccentric shape as the input shaft used in the first speed reducer and having a long axial length. It is.

In addition, the manufacturing method of the reduction gear series according to claim 6 is the manufacturing method of the reduction gear series according to claim 5, and further, the second reduction device includes a carrier member and a second input shaft. A second seal member is provided between the second seal members, and an arrangement position of the second seal member corresponds to an arrangement position of the seal member in the first reduction gear.

According to the reduction gear of the first aspect, since the seal member is disposed between the output portion and the cylindrical member, it is not necessary to add a dedicated output member or the like in order to dispose the seal member. For this reason, the number of parts can be reduced. Moreover, since a dedicated output member or the like is not required, the size of the reduction gear in the axial direction can be reduced.

Further, according to the speed reducer according to claim 2, since the carrier member also serves as the output portion, the seal member can be directly arranged on the carrier member. For this reason, the number of parts can be reduced. Moreover, since a dedicated output member or the like is not required, the size of the reduction gear in the axial direction can be reduced.

Further, according to the speed reducer according to claim 3, since the output portion protrudes from the cylindrical member, when the speed reducer is connected to the counterpart device, the counterpart device and the cylindrical member are unlikely to interfere with each other. Connection work with the counterpart device becomes easy.

Further, according to the speed reducer according to claim 4, since the inner diameter of the inlay and the outer diameter of the seal member are equal, the arrangement portion of the inlay and the seal member can be formed by the same processing. For this reason, the processing cost of an output part can be held down.

Further, according to the method of manufacturing the speed reducer series according to claim 5, the size in the axial direction can be reduced while the parts are shared by the first speed reducer and the second speed reducer. Moreover, a reduction gear series having the same output (in-lay) shape can be provided.

Moreover, according to the manufacturing method of the reduction gear series according to claim 6, the oil seal position can be made the same between the first reduction gear and the second reduction gear. For this reason, the reducer series of the shape of the same output part can be provided.

It is a center longitudinal cross-sectional view of the orthogonal axis | shaft speed reducer which is an example of embodiment of this invention. It is a center longitudinal section of a parallel axis reduction gear which is an example of an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a central longitudinal cross-sectional view of an orthogonal axis reduction gear 100 that is an example of an embodiment of a reduction gear according to the present invention.

The orthogonal shaft speed reducer 100 includes a first speed reduction portion 1, a second speed reduction portion 2, a housing 3, and a tubular member 4. The first speed reduction unit 1 is connected to the housing 3, and the second speed reduction unit 2 is built in the housing 3. The cylindrical member 4 has one end fixed to the housing 3 and the other end arranged coaxially through the center of the first speed reduction unit 1.

The first reduction gear unit 1 is an eccentric peristaltic type reduction unit in which the external gear 10 rotates eccentrically while meshing with the internal gear 11. The first reduction gear unit 1 includes a casing 12, a carrier 13, an external gear 10, and an input shaft 14a. The casing 12 has a cylindrical middle case 15 in which the internal gear 11 is integrally provided on the inner peripheral surface, and a cylindrical shape disposed on one end surface (the output side, the left side in FIG. 1) of the middle case 15 in the axial direction. The outer case 16 includes an inner case 15 and the outer case 16, which are connected to the other one in the axial direction (input) of the inner case 15 by a plurality of

bolts

17, 17. 1 and the right side of FIG. The outer case 16 also serves as an outer ring of the cross roller bearing 18.

The carrier 13 includes a first carrier member 13a and a second carrier member 13b. The first carrier member 13 a is rotatably supported on the inner side of the outer case 16 via a cross roller bearing 18. The first carrier member 13 a also serves as an inner ring of the cross roller bearing 18. On one end face in the axial direction of the first carrier member 13a, an output portion 19 for transmitting power to the counterpart device is formed. A plurality of bolt holes (not shown) are formed in the output unit 19 and are connected to the counterpart device using the bolt holes. In addition, a circular inlay portion 20 is formed inside the output portion 19 for use in alignment with the counterpart device.

Inside the casing 12, a hollow cylindrical input shaft 14a is coaxial with the axis of the internal gear 11 via two

ball bearings

21 and 21, and is connected to the first carrier member 13a and the second carrier member 13b. It is pivotally supported so that it can rotate. In the input shaft 14a, between the

ball bearings

21 and 21, a pair of

eccentric portions

22 and 22 having an outer diameter and an eccentricity δ1 that are equal to each other and whose eccentric directions are 180 degrees different from each other are formed adjacent to each other. . Each

eccentric part

22, 22 is provided with a needle bearing 24 composed of a plurality of

rollers

23, 23... Having a circular cross section disposed over the entire circumference, and external teeth are provided via the needle bearing 24.

Gears

10 and 10 are externally rotatably mounted. A plurality of bolt holes are formed in the end surface of the input shaft 14a on the input side in the axial direction. The end face position on the output side in the axial direction of the input shaft 14a is substantially the same position as the end face position on the output side of the ball bearing 21 on the output side.

Two

external gears

10, 10 having the same shape are arranged on the other axial direction of the first carrier member 13 a, and the two

external gears

10, 10 are formed by the first carrier member 13 a and the second carrier member 13 b. 10 is sandwiched. The external gears 10, 10 have a slightly smaller number of teeth than the number of teeth of the internal gear 11 and are inscribed in the eccentric gear 11 at an eccentric position. In the

external gears

10, 10, a plurality of circular pin holes 25 are formed at equal intervals in the circumferential direction on a concentric circle centered on an axis O2 offset by an eccentric amount δ1 from the axis O1 of the input shaft 14a. The pin holes 25 are loosely inserted with pins 26 laid on the concentric circle centering on the axis O1 of the input shaft 14a in parallel with the axis. Both ends of the pin 26 are press-fitted into holes provided in the first carrier member 13a and the second carrier member 13b, and the first carrier member 13a and the second carrier member 13b can be integrally rotated by the pin 26. . A cylindrical metal 27 is integrally mounted on the loose insertion portion of the external gear 10 on the outer periphery of the pin 26.

An oil seal 28 is disposed outside the cross roller bearing 18 between the outer case 16 and the first carrier member 13a. In addition, an oil seal 29 a is disposed outside the ball bearing 21 between the first carrier member 13 a and the tubular member 4. A portion of the first carrier member 13 a where the oil seal 29 a is disposed is formed to have the same diameter as the spigot portion 20. The internal space of the orthogonal shaft reduction gear 100 is sealed by the oil seal 28 and the oil seal 29a.

The second reduction part 2 is an orthogonal axis type reduction part, and includes a bevel gear 41 and a bevel pinion 42 that meshes with the bevel gear 41 and rotates about an axis O3 orthogonal to the axis O1 of the input shaft 14a. Built in. The bevel gear 41 is connected to the input side end of the input shaft 14 a of the first reduction gear 1. The bevel gear 41 is fixed to a bolt hole provided at the end of the input shaft 14a by a plurality of

bolts

43, 43,... And can be rotated integrally with the input shaft 14a about the axis O1 of the input shaft 14a. . The bevel pinion 42 includes a connecting portion 44 that can be connected to a motor (not shown) on the side opposite to the teeth meshing with the bevel gear 41, and is rotatably supported inside the housing 3 via a ball bearing 45.

The cylindrical member 4 is a cylindrical member formed of, for example, an aluminum alloy, and includes a fixed portion 51 fixed to the housing 3, a main body portion 52 that coaxially penetrates the first reduction gear 1 and the bevel gear 41. , And an intermediate portion 53a connecting between the fixed portion 51 and the main body portion 52. The cylindrical member 4 is fixed to the housing 3 only on the fixed portion 51 side, and the main body portion 52 side is only supported by the lip of the oil seal 29a and is not pivotally supported. That is, it is fixed to the housing 3 in a so-called cantilever state.

The fixing portion 51 of the cylindrical member 4 includes a circular flange portion 54 and an inlay portion 55, and the inlay portion 55 is fitted to the inner periphery of the opening provided in the housing 3, and a plurality of flange portions 54 are provided. Are fixed to the housing 3 by

bolts

56, 56. In the fixing portion 51 of the tubular member 4, the axial length D5 of the spigot portion 55 is longer than the length D6 of the surface perpendicular to the axial direction of the flange portion 54. The inlay portion 55 is provided with a groove 57 over the entire circumference, and an O-ring 58 is disposed in the groove 57. An O-ring 58 seals between the opening of the housing 3 and the spigot 55 of the tubular member 4.

A main body 52 is formed on the opposite side of the cylindrical member 4 from the fixed portion 51. The front end 59 of the main body 52 reaches the inside of the first carrier member 13a, and the lip of the oil seal 29a contacts the outer periphery of the front end 59. The main body 52 of the tubular member 4 is not provided with a bearing or the like that supports the input shaft 14a or the bevel gear 41, and is disposed with a slight gap A from the inner peripheral surface of the input shaft 14a. An inner diameter D <b> 3 larger than the inner diameter D <b> 1 of the main body 52 is formed in the intermediate portion 53 a of the tubular member 4. Further, in the main body 52 of the cylindrical member 4, in a range B overlapping with the input shaft 14 a and the bevel gear 41 when viewed from the direction orthogonal to the axis O 1 of the input shaft 14 a, a step, a groove, etc. This is a cylindrical shape that is not provided with the shape.

The distal end portion 59 of the cylindrical member 4 does not protrude beyond the end surface of the output portion 19 of the first carrier member 13a in the direction of the axis O1 of the input shaft 14a.

In the orthogonal shaft speed reducer 100 configured as described above, when the bevel pinion 42 is rotated by a motor (not shown), the bevel gear 41 meshing with the bevel pinion 42 is rotated, and the input shaft 14a connected to the bevel gear 41 is rotated. As the input shaft 14a rotates, the

eccentric portions

22 and 22 eccentrically move symmetrically, and eccentrically and rotate while the

external gears

10 and 10 are inscribed in the internal gear 11. For this reason, each pin hole 25 also moves eccentrically and rotates. However, since each pin hole 25 is formed to have a larger diameter than the pin 26 including the metal 27, each pin 26 is in a state in which it is inscribed in the pin hole 25. The eccentric component is relatively moved to absorb the eccentric component, and only the rotation component is extracted from each pin 26. Therefore, the first carrier member 13a and the second carrier member 13b rotate synchronously via the pin 26, and the rotation is transmitted from the output unit 19 to the counterpart device. At this time, the grease filled in the housing 3 is sealed by the oil seal 28 and the oil seal 29a.

Next, the parallel shaft speed reducer 200 will be described with reference to FIG. The parallel shaft reducer 200 corresponds to the first reduction unit 1 in the orthogonal shaft reducer 100 described above.

In the parallel shaft speed reducer 200, a disk-shaped case cover 31 is disposed on the other axial side of the middle case 15 (input side, right side in FIG. 2). The middle case 15, the outer case 16, and the case cover 31 are integrally coupled by a plurality of

bolts

17, 17,... That pass through the middle case 15 from the case cover 31 side and are screwed to the outer case 16. .

Inside the casing 12, a hollow cylindrical input shaft 14b is coaxial with the axis of the internal gear 11 via two

ball bearings

21 and 21, and is connected to the first carrier member 13a and the second carrier member 13b. It is pivotally supported so that it can rotate. In the input shaft 14b, between the

ball bearings

21 and 21, a pair of

eccentric portions

eccentric part

22, 22 is provided with a needle bearing 24 composed of a plurality of

rollers

Gears

10 and 10 are externally rotatably mounted. A plurality of bolt holes are formed on the end surface of the input shaft 14b on the input side in the axial direction. The front end of the input shaft 14b on the output side in the axial direction protrudes beyond the end face on the output side of the ball bearing 21 on the output side.

An oil seal 29b is disposed outside the ball bearing 21 between the first carrier member 13a and the tip of the input shaft 14b. A portion of the first carrier member 13 a where the oil seal 29 b is disposed is formed to have the same diameter as the spigot portion 20. The internal space of the parallel shaft speed reducer 200 is sealed by the oil seal 28 and the oil seal 29b. An oil seal 32 is disposed between the inner peripheral surface of the case cover 31 and the outer peripheral surface of the input shaft 14 b, and the internal space of the parallel shaft speed reducer 200 is sealed by the oil seal 32.

The bolt holes provided at the input side end of the input shaft 14b are connected to input side members such as various gears, pulleys, or motors depending on applications.

The arrangement position of the oil seal 29a in the orthogonal axis reduction gear 100 and the arrangement position of the oil seal 29b in the parallel axis reduction gear 200 correspond to each other. That is, the position of the oil seal 29a with respect to the first carrier member 13a in the orthogonal shaft reducer 100 and the position of the oil seal 29b with respect to the first carrier member 13a in the parallel shaft reducer 200 are the same. The oil seal 29a and the oil seal 29b have the same outer diameter and different inner diameters.

The shape of the tip portion of the input shaft 14b, the shape of the oil seal 29b, the shape of the case cover 31, the configuration of the parallel shaft speed reducer 200 excluding the oil seal 32, and the operation of the parallel shaft speed reducer 200 are described above. Since it is the same as that of the structure and operation | movement of the 1st reduction part 1 in the orthogonal shaft reduction gear 100, detailed description is abbreviate | omitted.

As described above, according to the orthogonal shaft speed reducer 100 of the above-described form, the oil seal 29a is disposed between the output portion 19 and the tip portion 59 of the cylindrical member 4, and therefore, a dedicated extra for arranging the oil seal. It is not necessary to arrange an output member or the like. For this reason, the magnitude | size of the axial direction of the orthogonal shaft reduction gear 100 can be made small.

Moreover, since the output part 19 is formed in the 1st carrier member 13a, the carrier and the output part 19 are united, and it is necessary to arrange an extra output member etc. for exclusive use in order to arrange an oil seal. Absent. For this reason, the number of parts of the orthogonal shaft reduction gear 100 can be reduced. Further, the size of the orthogonal shaft reduction gear 100 in the axial direction can be reduced.

Moreover, since the output part 19 protrudes from the front-end | tip part 59 of the cylindrical member 4, when connecting the other party apparatus and the output part 19, the other party apparatus and the cylindrical member 4 do not interfere easily, and the other party side The connection work with the apparatus becomes easy.

Also, since the inner diameter of the spigot portion 20 of the output portion 19 is equal to the outer diameter of the oil seal 29a, the spigot portion 20 and the housing portion of the oil seal 29a can be formed by the same processing. For this reason, the structure of the 1st carrier member 13a becomes simple, and processing cost can be held down.

According to the speed reducer series including the orthogonal shaft speed reducer 100 and the parallel axis speed reducer 200 according to the present embodiment, the internal gear 11, the external gear 10, and the carrier 13 can be shared. Costs can be reduced by sharing parts.

Also, since the position of the oil seal is the same in the orthogonal shaft speed reducer 100 that is the first speed reducer and the parallel axis speed reducer 200 that is the second speed reducer, the shape of the output portion is the same. For this reason, the reducer series of the shape of the same output part can be provided.

As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, A various change is possible. Below, the example of the change which can be added to the said embodiment is demonstrated.

For example, in the orthogonal shaft speed reducer 100 according to the present embodiment, the bevel gear is arranged at one end of the input shaft 14a, but it may be a spur gear instead of the bevel gear. Further, for example, in the orthogonal shaft reducer 100, the middle case 15 and the housing 3 are integrally coupled, but are connected to the housing 3, but the parallel shaft reducer is interposed between the middle case 15 and the housing 3. You may couple | bond through the case cover 31 used for 200. FIG.

[Correspondence between Configurations of Present Invention and Embodiment]
The orthogonal axis reduction device 100 of the present embodiment is an example of a first reduction device of the present invention. The parallel-axis speed reducer 200 of this embodiment is an example of the 2nd speed reducer of this invention. The oil seal 29a of this embodiment is an example of the seal member of the present invention. The oil seal 29b of this embodiment is an example of the second seal member of the present invention. The bevel gear 41 of this embodiment is an example of the input gear of the present invention. The tip portion 59 of the present embodiment is an example of the other end of the present invention.

DESCRIPTION OF SYMBOLS 100 Orthogonal axis reduction gear 200 Parallel axis reduction gear 1 1st reduction part 2 2nd reduction part 3 Housing | casing 4 Cylindrical member 10 External gear 11 Internal gear 13

Carrier

14a, 14b Input shaft 19 Output part 20

Inlay part

28, 29a, 29b Oil seal 41 Bevel gear 42 Bevel pinion 51 Fixed part 52 Body part 53a Intermediate part 54 Flange part 55 Slot part 57 Groove 59 Tip part O1 Input shaft axis O3 Second axis A Clearance B Range overlapping input shaft D1 Body part Inner diameter D2 Outer diameter of main body D3 Inner diameter of intermediate part D5 Length of spigot part D6 Length of flange part

Claims

A housing,
A speed reduction portion connected to the housing, the speed reduction portion having a hollow input shaft and an output portion; an input gear fixed to one end of the input shaft;
A cylindrical member having one end fixed to the housing and disposed coaxially through the input shaft and the input gear;
A speed reducer, comprising: a seal member disposed between the output portion and the other end of the cylindrical member.
The speed reducer includes an internal gear, an external gear that is externally fitted on an eccentric portion provided on the input shaft and meshes with the internal gear, and a revolution of the external gear that supports the input shaft. An eccentric peristaltic reduction unit having a carrier member for outputting motion;
The speed reducer according to claim 1, wherein the carrier member also serves as the output unit.
The speed reducer according to claim 1 or 2, wherein the output portion protrudes from the other end of the cylindrical member in a rotation axis direction of the input shaft.
The speed reducer according to any one of claims 1 to 3, wherein the inner diameter of the spigot of the output portion is equal to the outer diameter of the seal member.
The speed reducer according to claim 1, wherein the input gear is a bevel gear;
A method of manufacturing a reduction gear series including an internal gear, an external gear, and a second reduction gear configured using a member having the same shape as the carrier member, the first reduction gear comprising:
Producing a first speed reducer;
A step of manufacturing a second speed reducer using a second input shaft having the same shape as the input shaft used in the first speed reducer and having a long axial length;
A method of manufacturing a speed reducer series, characterized in that
The second speed reducer includes a second seal member disposed between the carrier member and a second input shaft,
The method for manufacturing a reduction gear series according to claim 5, wherein the arrangement position of the second seal member corresponds to the arrangement position of the seal member in the first reduction gear.