WO2020235399A1

WO2020235399A1 - Gear device

Info

Publication number: WO2020235399A1
Application number: PCT/JP2020/019018
Authority: WO
Inventors: 田村　光拡; 山本　章; 真大渡辺; 年昭的場
Original assignee: 住友重機械工業株式会社
Priority date: 2019-05-23
Filing date: 2020-05-12
Publication date: 2020-11-26
Also published as: DE112020002504T5; CN113825930A; JP7450776B2; JP2023053303A; JP7267550B2; JP2020190306A

Abstract

This gear device comprises an externally toothed gear 14 and an internally toothed member 16 provided with an internally toothed gear 24 that meshes with the externally toothed gear 14. The internally toothed member 16 is configured from a resin material and is provided with a reinforcing member 60 that restrains radially outward deformation of the internally toothed gear 24 caused by meshing with the externally toothed gear 14, and the reinforcing member 60 is provided to the outer peripheral portion of the internally toothed member 16, in a portion where radial distance from internal teeth of the internally toothed gear 24 is smallest.

Description

Gear device

The present invention relates to a gear device.

In recent years, the applications of gear devices have diversified, and there are cases where weight reduction is required. As a gear device that meets this demand, Patent Document 1 discloses a gear device in which an internal tooth member having an internal tooth gear is made of a resin-based material.

JP-A-2018-155313

The present inventor examined the technology of Patent Document 1 and obtained the following new recognition. Resin-based materials usually have lower rigidity than metal materials. Therefore, when the internal tooth member made of a resin material is used, the internal tooth gear is more likely to be deformed radially outward due to the meshing with the external tooth gear as compared with the case where the metal material is used. As a result, it may not be possible to ensure normal meshing between the external gear and the internal gear. The technique of Patent Document 1 was not devised from this point of view, and there was room for improvement.

A certain aspect of the present invention is made in view of such a situation, and one of the objects thereof is to provide a gear device capable of ensuring normal meshing of an external gear and an internal gear while reducing the weight. ..

A certain aspect of the present invention for solving the above-mentioned problems is a gear device. The gear device of this embodiment is a gear device including an external gear and an internal tooth member provided with an internal gear that meshes with the external gear, and the internal tooth member is made of a resin-based material. A reinforcing member for restraining the radial outward deformation of the internal gear due to meshing with the external gear is provided, and the reinforcing member is the internal tooth of the internal gear among the outer peripheral portions of the internal gear. It is provided on the outer peripheral portion where the radial distance from is the smallest.

The gear device of another aspect of the present invention is a gear device including an external gear and an internal tooth member provided with an internal gear that meshes with the external gear, and the internal tooth member is made of resin. It is made of a material and includes a reinforcing member that restrains the radial outward deformation of the internal gear due to meshing with the external gear, and the reinforcing member is composed of a member separate from the bearing and the bolt.

According to an aspect of the present invention, it is possible to ensure normal meshing of the external gear and the internal gear while reducing the weight.

It is a side sectional view of the gear device of an embodiment. It is an enlarged view of FIG.

Hereinafter, an example of the embodiment of the present invention will be described. The same components are designated by the same reference numerals, and duplicate description will be omitted. In each drawing, for convenience of explanation, some of the components are appropriately omitted, and the dimensions thereof are appropriately enlarged or reduced. The drawings shall be viewed according to the orientation of the symbols. The structures and shapes referred to in the present specification include not only structures and shapes that exactly match the referred shapes, but also structures and shapes that are deviated by an error such as a dimensional error or a manufacturing error.

Refer to FIG. The gear device 10 of the embodiment mainly includes an input member 12, an external gear 14, an internal tooth member 16, a casing 18, a carrier 20, and an output member 22. The internal tooth member 16 is provided with an internal tooth gear 24 that meshes with the external tooth gear 14. Hereinafter, the direction along the central axis La of the internal gear 24 is simply referred to as "axial direction X", and the circumferential direction and radial direction around the central axis La are simply referred to as "circumferential direction" and "diameter direction".

The gear device 10 of the present embodiment is a flexure meshing type gear device that rotates the external gear 14 by rotating the external gear 14 while flexing and deforming it by a vibrating body 26 described later, and outputs the rotation component thereof. The gear device 10 of the present embodiment is a so-called tubular flexure meshing type gear device using a plurality of internal tooth members 16.

The input member 12 is connected to a drive device (not shown), and rotation is input from the drive device. The drive device is, for example, a motor, a gear motor, an engine, or the like. The drive device is arranged on one side (right side in the drawing) of the axial direction X with respect to the input member 12. Hereinafter, for convenience of explanation, one side of the axial direction X is referred to as an input side, and the other side (left side in the figure) is referred to as an anti-input side.

The input member 12 of this embodiment is composed of a so-called oscillator 26. The vibrating body 26 is a tubular member having a rigidity sufficient to bend and deform the external gear 14 by its own rotation. The exciter 26 includes an intermediate shaft portion 26a at an intermediate portion in the axial direction X. The outer peripheral shape of the cross section of the intermediate shaft portion 26a orthogonal to the axial direction X is elliptical. The term "ellipse" as used herein is not limited to a geometrically exact ellipse, but also includes a substantially ellipse.

The external gear 14 is arranged on the outer peripheral side of the input member 12, and is rotatably supported by the input member 12 via a first bearing 28 arranged between the external gear 14 and the input member 12. The external gear 14 of the present embodiment is a flexible tubular member, and is arranged on the outer peripheral side of the intermediate shaft portion 26a of the oscillator 26.

The internal tooth member 16 is an annular member arranged on the outer peripheral side of the external tooth gear 14, and the internal tooth gear 24 is provided on the inner peripheral portion thereof. The internal tooth gear 24 is composed of a plurality of internal teeth provided on the inner peripheral portion of the internal tooth member 16 over the entire circumference. The internal tooth member 16 of the present embodiment has a rigidity that does not deform following the rotation of the oscillator 26. The internal tooth member 16 of the present embodiment includes a deceleration internal tooth member 16A (first internal tooth member) arranged on the input side and an output internal tooth member 16B (second internal tooth member) arranged on the opposite side. Members) and are included.

The deceleration internal tooth member 16A of the present embodiment is fixed to an external member (not shown). A reduction internal gear 24A (first internal gear) that meshes with the external gear 14 is provided on the inner peripheral portion of the reduction internal tooth member 16A. The reduction internal gear 24A has a number of teeth different from that of the external gear 14, and in the present embodiment, has a larger number of teeth than the external gear 14. As a result, when the exciter 26 makes one rotation, a deviation in the rotation phase corresponding to the difference in the number of teeth between the reduction internal gear 24A and the external gear 14 occurs in the external gear 14, and the rotation of the deviation is outside. It occurs in the tooth gear 14. The reduction internal gear 24A rotates the external gear 14 in conjunction with the rotation of the exciter 26. The external gear 14 rotates at a rotation speed slower than the rotation speed of the oscillator 26 based on a reduction ratio corresponding to the difference in the number of teeth between the reduction internal gear 24A and the external gear 14.

An output internal gear 24B (second internal gear) that meshes with the external gear 14 is provided on the inner peripheral portion of the output internal tooth member 16B. The output internal gear 24B has the same number of teeth as the external gear 14. As a result, when the external gear 14 rotates due to one rotation of the exciter 26, a rotation having the same magnitude as the rotation component is output to the output internal tooth member 16B. When the external gear 14 rotates in conjunction with the rotation of the exciter 26, the output internal gear 24B synchronizes with the rotation component thereof.

The casing 18 is an annular member provided on the outermost peripheral portion of the gear device 10. The casing 18 of the present embodiment is arranged radially outward with respect to the output internal gear 24B. A main bearing 30 is arranged between the casing 18 and the output internal gear 24B. The casing 18 of the present embodiment rotatably supports the output internal gear 24B via the main bearing 30. The casing 18 of the present embodiment is fitted and integrated with the reduction internal gear 24A by using a bolt or the like.

The main bearing 30 includes a rolling element 30a, an inner ring 30b, and an outer ring 30c. The rolling element 30a of the present embodiment is a sphere, but may be a roller or the like. In the present embodiment, the inner ring 30b is made of a member different from the output inner tooth member 16B, and the outer ring 30c is made of a member different from the casing 18. The inner ring 30b may be composed of the output inner tooth member 16B, or the outer ring 30c may be composed of the casing 18.

The carrier 20 of the present embodiment includes an input side carrier 20A arranged on the input side and a non-input side carrier 20B arranged on the non-input side. The input side carrier 20A of the present embodiment is integrated with the reduction internal gear 24A by being connected to the reduction internal gear 24A by using the first bolt B1. The counter-input side carrier 20B of the present embodiment is integrated with the output internal gear 24B by being connected to the output internal gear 24B by using the second bolt B2. A second bearing 32 is arranged between each carrier 20 and the input member 12, and the carrier 20 rotatably supports the input member 12 via the second bearing 32.

The output member 22 is integrated with the driven device by being connected to the driven device, and outputs rotational power to the driven device. The output member 22 of this embodiment is a non-input side carrier 20B.

The operation of the above gear device 10 will be described.

When the rotation is transmitted from the drive device to the input member 12, the rotation is transmitted to the output member 22 via the reduction mechanism composed of the external gear 14 and the internal gear 24. At this time, the rotation of the input member 12 is decelerated by the reduction ratio of the reduction mechanism and then output from the output member 22 to the driven device.

In the present embodiment, following the rotation of the exciter 26 (input member 12), the external gear 14 is elliptical and deformed by the intermediate shaft portion 26a of the exciter 26 via the first bearing 28. .. At this time, the external gear 14 is bent and deformed so as to match the shape of the intermediate shaft portion 26a of the oscillator 26 while changing the meshing position with the internal gear 24 in the circumferential direction. As a result, the external gear 14 with respect to the deceleration internal gear 24A by the amount corresponding to the difference in the number of teeth between the external gear 14 and the deceleration internal gear 24A each time the exciting body 26 rotates once. Relative rotation (rotation). At this time, the output internal gear 24B rotates in synchronization with the rotation component of the external gear 14 without changing the relative meshing position with respect to the external gear 14 before and after one rotation of the input member 12. The rotation of the output internal gear 24B is output from the counter-input side carrier 20B (output member 22) to the driven device.

Refer to Fig. 2. The above internal tooth member 16 is made of a resin-based material. In the present embodiment, both the deceleration internal tooth member 16A and the output internal tooth member 16B are made of a resin-based material. The "resin-based material" here includes, in addition to engineering plastics and the like, fiber-reinforced resins such as carbon fiber-reinforced resin and glass fiber-reinforced resin, that is, composite materials. As a result, the weight of the internal tooth member 16 can be reduced as compared with the case where a metal-based material is used for the internal tooth member 16. The "metal-based material" here includes cast iron, iron-based materials including steel, and aluminum-based materials including aluminum alloys.

The deceleration internal tooth member 16A includes a first annular portion 34, a first protruding portion 36 protruding in the axial direction X from the inner peripheral side end portion of the first annular portion 34, and an inner peripheral side end portion of the first annular portion 34. A second protruding portion 38 protruding from the first protruding portion 36 on the opposite side of the axial direction X is provided. Further, the deceleration internal tooth member 16A includes a third protruding portion 40 protruding in the axial direction X from the outer peripheral side end portion of the first annular portion 34. The reduction gear 24A is provided on the inner peripheral portion of the first annular portion 34 and the first protruding portion 36 and the inner peripheral portion of the base end portion of the second protruding portion 38. The deceleration internal tooth member 16A is provided with an annular recess 42 recessed in the axial direction X between the first protrusion 36 and the third protrusion 40. The first bolt B1 connecting the deceleration internal tooth member 16A and the input side carrier 20A is screwed into the second protruding portion 38.

The output internal tooth member 16B includes a second annular portion 44 in which the output internal gear 24B is provided on the inner peripheral portion, a fourth protruding portion 46 protruding from the second annular portion 44 in the axial direction X, and a second annular portion. A fifth protruding portion 48 protruding from the 44 to the opposite side of the fourth protruding portion 46 in the axial direction X is provided. The second bolt B2 connecting the output internal tooth member 16B and the non-input side carrier 20B is screwed into the fourth protruding portion 46. The fifth protrusion 48 is arranged inside the annular recess 42 of the reduction internal tooth member 16A, and is provided at a position overlapping the first protrusion 36 of the reduction internal tooth member 16A when viewed from the radial direction.

The deceleration internal tooth member 16A includes a first outer peripheral portion 50 formed by the first protruding portion 36, a second outer peripheral portion 52 formed by the second protruding portion 38, a first annular portion 34, and a third protruding portion 40. A third outer peripheral portion 54 is provided. The output internal tooth member 16B has a fourth outer peripheral portion 56 formed by a second annular portion 44, a fourth protruding portion 46, and a base end side portion of the fifth protruding portion 48, and a tip end side portion of the fifth protruding portion 48. A fifth outer peripheral portion 58 is provided. The term "outer peripheral portion" as used herein refers to a portion of the referred internal tooth member 16 formed by a surface facing outward in the radial direction. In the present embodiment, this "plane" is a flat surface extending in the axial direction X, and is provided in a range extending over the entire circumference of the central axis La of the internal tooth member 16.

The radial distances from the internal teeth 64 of the deceleration internal gear 24A of the deceleration internal tooth member 16A to the first outer peripheral portion 50, the second outer peripheral portion 52, and the third outer peripheral portion 54 are referred to as L1, L2, and L3. The radial distances from the internal teeth 66 of the output internal gear 24B of the output internal tooth member 16B to the fourth outer peripheral portion 56 and the fifth outer peripheral portion 58 are referred to as L4 and L5. The "diameter distance" refers to the distance from the tooth bottom of the internal tooth of the referred internal gear 24 to the surface of the referred outer peripheral portion that faces outward in the radial direction. At this time, in the present embodiment, among the plurality of outer

peripheral portions

50, 52, 54 of the deceleration internal tooth member 16A, the radial distance L1 of the first outer peripheral portion 50 is the smallest, and then the diameter of the second outer peripheral portion 52. The directional distance L2 is small, and the radial distance L3 of the third outer peripheral portion 54 is the largest. Further, in the present embodiment, among the plurality of outer

peripheral portions

56, 58 of the output internal gear 24B, the radial distance L4 of the fourth outer peripheral portion 56 is the smallest, and the radial distance L5 of the fifth outer peripheral portion 58 is the largest. growing.

A load toward the outer side in the radial direction is applied to the internal gear 24 by meshing with the external gear 14, and the internal gear 24 tries to be deformed so that the outer diameter is partially increased by the load. The gear device 10 includes a reinforcing member 60 that restrains the radial outward deformation of the internal gear 24 due to meshing with the external gear 14. The reinforcing member 60 of the present embodiment includes a first reinforcing member 60A that restrains the deformation of the reduction internal gear 24A and a second reinforcing member 60B that restrains the deformation of the output internal gear 24B.

The reinforcing member 60 is configured by using a material having a Young's modulus [Pa] larger than that of the resin-based material constituting the internal tooth member 16 in which the reinforcing member 60 is used. In order to realize this, the reinforcing member 60 of the present embodiment is made of a metal-based material. As a result, the deformation of the internal tooth member 16 can be effectively restrained by using the resin-based material constituting the internal tooth member 16. In relation to this effect, the larger the Young's modulus of the reinforcing member 60, the more preferable. The Young's modulus of the reinforcing member 60 is set to be, for example, 10 times or more the Young's modulus of the resin-based material constituting the internal tooth member 16. This is realized by, for example, the internal tooth member 16 being made of engineering plastic and the reinforcing member 60 being made of a metal-based material (for example, an iron-based material).

The first reinforcing member 60A is composed of a member separate from the bearing and the bolt. The "bearing" here is arranged between a plurality of components that can rotate relative to each other used in the gear device 10. In this embodiment, for example, the first bearing 28, the main bearing 30, and the like are applicable. The "bolt" here is used to connect a plurality of components used in the gear device 10. In this embodiment, for example, the first bolt B1 and the second bolt B2 are applicable. The second reinforcing member 60B of the present embodiment is composed of the inner ring 30b of the main bearing 30.

The first reinforcing member 60A has an endless ring shape. The second reinforcing member 60B has an endless ring shape. The term "endless ring shape" as used herein means a shape that is continuous over the entire circumference around the central axis La and has no end in the circumferential direction.

The first reinforcing member 60A is provided on the first outer peripheral portion 50 by being fitted to the first outer peripheral portion 50 of the deceleration internal tooth member 16A. The first reinforcing member 60A is provided on the first outer peripheral portion 50 having the smallest radial distance L1 among the outer

peripheral portions

50, 52, 54 of the deceleration internal tooth member 16A in which the first reinforcing member 60A is used. become. The first reinforcing member 60A is fitted by tightening, intermediate fitting, or the like.

An annular groove portion 62 that is recessed in the axial direction X and extends in the circumferential direction is formed in the first annular portion 34 of the deceleration internal tooth member 16A of the present embodiment, and a part of the first reinforcing member 60A is fitted into the groove portion 62. ..

The second reinforcing member 60B is provided on the fourth outer peripheral portion 56 by being fitted to the fourth outer peripheral portion 56 of the output internal tooth member 16B. The second reinforcing member 60B is provided on the fourth outer peripheral portion 56 having the smallest radial distance L4 among the outer

peripheral portions

56 and 58 of the output internal tooth member 16B in which the second reinforcing member 60B is used. .. The second reinforcing member 60B is fitted by tightening, intermediate fitting, or the like.

The effects of the above gear device 10 will be explained.

According to the gear device 10 of the present embodiment, when the internal gear 24 tries to be deformed radially outward due to meshing with the external gear 14, the deformation can be restrained by the reinforcing member 60. Therefore, even when a resin-based material having a lower rigidity than the metal-based material is used for the internal tooth member 16, normal meshing of the external tooth gear 14 and the internal tooth gear 24 is ensured as compared with the case where the reinforcing member 60 is not provided. it can. Therefore, by using a resin-based material for the internal tooth member 16, it is possible to secure normal meshing between the external tooth gear 14 and the internal tooth gear 24 while reducing the weight.

If the internal gear 24 is deformed radially outward, the larger the torque that acts, the easier it is for ratcheting (tooth skipping) to occur between the internal gear 24 and the external gear 14. In this respect, according to the present embodiment, ratcheting can be suppressed by suppressing the deformation of the internal gear 24 in the radial direction. Therefore, by using a resin-based material for the internal tooth member 16, it is possible to increase the allowable torque of the gear device 10 while reducing the weight.

Further, if the normal meshing of the external gear 14 and the internal gear 24 cannot be ensured, it may cause local wear. In this respect, according to the present embodiment, since the normal meshing of the external gear 14 and the internal gear 24 can be ensured, local wear can be suppressed.

The reinforcing member 60 is provided on the outer

peripheral portions

50 and 56 of the outer peripheral portion of the internal tooth member 16 where the radial distance from the internal tooth of the internal gear 24 is the smallest. This advantage will be explained.

The boundary that separates the reinforcing member 60 and the internal tooth member 16 in the radial direction is called a boundary position, and consider a case where a constant load toward the outer side in the radial direction is applied to the tooth contact position of the internal gear 24 with respect to the external gear 14. In this case, the wider the radial range from the tooth contact position to the boundary position of the internal tooth member 16, the more easily the amount of compression deformation of the internal tooth member 16 in the radial range increases, and the tooth contact position becomes radial. It becomes easy to change to.

In this respect, according to the present embodiment, as compared with the case where the reinforcing member 60 is provided on the outer

peripheral portions

52, 54, 58, which are far from the internal teeth of the internal gear 24 in the radial direction, from the tooth contact position of the internal tooth member 16. The radial range to the boundary position can be narrowed. Along with this, when a load is applied to the tooth contact position of the internal gear 24 with respect to the external gear 14, the amount of compression deformation in the above-mentioned radial range can be reduced, and the external gear 14 and the internal gear 24 can be reduced. More normal meshing can be secured.

The reinforcing member 60 has an endless ring shape. Therefore, as compared with the case where the reinforcing member 60 has an end portion in the circumferential direction, the reinforcing member 60 can be made more rigid, and the reinforcing member 60 can more easily restrain the deformation of the internal tooth member 16.

When the reinforcing member 60 is made of a resin-based material, not only the internal tooth member 16 but also the reinforcing member 60 is affected by sink marks, and it becomes difficult to secure the dimensional accuracy of the reinforcing member 60 and the internal tooth member 16. Due to this, when the reinforcing member 60 is fitted to the outer peripheral portion of the internal tooth member 16, a large gap is likely to occur between the internal tooth member 16 and the reinforcing member 60, and the deformation restraining effect of the reinforcing member 60 is exerted. It becomes stable and difficult to obtain.

In this respect, according to the present embodiment, since the reinforcing member 60 is composed of the metal-based material, it becomes easier to secure the dimensional accuracy of the reinforcing member 60 as compared with the case where the resin-based material is used for the reinforcing member 60. Along with this, when the reinforcing member 60 is fitted to the outer peripheral portion of the internal tooth member 16, a large gap is less likely to occur between the internal tooth member 16 and the reinforcing member 60, and the deformation restraining effect of the reinforcing member 60 is stabilized. It will be easier to obtain.

The reinforcing member 60 includes a first reinforcing member 60A that restrains deformation of the deceleration internal tooth member 16A that rotates the external gear 14. This advantage will be explained.

The output internal gear 24B synchronizes with the rotation component of the external gear 14. Therefore, ideally, the external teeth of the external tooth gear 14, which is the meshing partner of each internal tooth of the output internal gear 24B, are the same regardless of the rotation speed of the exciter 26. On the other hand, the reduction internal gear 24A rotates relative to the external gear 14 due to the rotation of the external gear 14. Therefore, the external teeth of the external gear 14, which is the meshing partner of each internal tooth of the deceleration internal gear 24, change according to the rotation speed of the exciting body 26. Since the dimensions of each external tooth of the external gear 14 change due to the influence of the dimensional error, when the meshing partner of each internal tooth of the internal gear 24 changes according to the rotation speed of the exciter 26, the external tooth gear 14 is subjected to a change. The tooth contact position of each internal tooth may also change. As a result, the reduction internal gear 24A has a problem that local wear is likely to occur on the tooth tip side as compared with the output internal gear 24B. According to this embodiment, even under such a premise, the deformation of the reduction internal gear 24A can be restrained by the first reinforcing member 60A, so that it is effective to suppress local wear on the tooth tip side. It can be planned.

Next, other ingenuity of the speed reducer of this embodiment will be described.

The first reinforcing member 60A is provided at a position overlapping the internal teeth 64 of the reduction internal gear 24A in which the first reinforcing member 60A is used when viewed from the radial direction. In the present embodiment, it is provided at a position overlapping a part of the internal teeth 64 of the reduction internal gear 24A in the axial direction. Specifically, it is provided at a position overlapping the range including the axial central portion 64a of the internal tooth 64. In this embodiment, this range is more than half of the total length La of the internal teeth 64 in the axial direction.

The second reinforcing member 60B is provided at a position overlapping the internal teeth 66 of the output internal gear 24B in which the second reinforcing member 60B is used when viewed from the radial direction. In the present embodiment, it is provided at a position overlapping a part of the internal teeth 66 of the output internal gear 24B in the axial direction. Specifically, it is provided at a position overlapping the range including the axial central portion 66a of the internal tooth 66. In this embodiment, this range is more than half of the total length Lb of the internal teeth 66 in the axial direction.

As a result, when a load is applied radially outward from the tooth contact position of the internal gear 24, the load is applied as compared with the case where the reinforcing member 60 is provided at a position that does not overlap with the internal gear 24 when viewed from the radial direction. The reinforcing member 60 makes it easier to receive firmly. Along with this, the deformation of the internal gear 24 in the radial direction can be effectively restrained by the reinforcing member 60.

From the viewpoint of effectively obtaining such an effect, the reinforcing member 60 is positioned at a position where the reinforcing member 60 overlaps the total axial lengths La and Lb of the internal teeth 66 and 68 of the internal gear 24 in which the reinforcing member 60 is used when viewed from the radial direction. It is preferable to be provided.

A modified example of each component will be explained.

The specific example of the gear device 10 is not particularly limited as long as it includes an external tooth gear 14 and an internal tooth member 16 that mesh with each other. For example, in addition to the flexible mesh gear device, an eccentric swing type gear device, a simple planetary gear device, or the like may be used. The eccentric swing type gear device may be a center crank type in which a crankshaft serving as an input member 12 is arranged on the central axis La of the internal gear 24. In addition to this, a distribution type in which the crankshaft is arranged at a position offset from the central axis La may be used. The flexible meshing type gear device is not limited to the tubular type, and for example, a top hat type, a cup type, or the like may be used.

The output member 22 may be composed of any carrier 20 or the casing 18.

Among the components of the gear device 10, the materials of the components other than the internal tooth member 16 are not particularly limited. For example, the external gear 14 may be made of either a metal-based material or a resin-based material. The same applies to other components.

When a plurality of internal tooth members 16 are used, only one internal tooth member 16 may be used as a resin-based material, and the other internal tooth member 16 may be used as another material. In this case, the gear device 10 may include a reinforcing member 60 that restrains the deformation of the internal tooth member 16 made of a resin material. For example, the gear device 10 includes a first internal tooth member 16A made of a resin material, a second internal tooth member 16B made of a metal material, and a first reinforcing member 60A that restrains deformation of the first internal tooth member 16A. , The second reinforcing member 60B that restrains the deformation of the second internal tooth member 16B may not be provided. In addition to this, the gear device 10 includes a first internal tooth member 16A made of a metal material, a second internal tooth member 16B made of a resin material, and a second reinforcing member 60B that restrains deformation of the second internal tooth member 16B. It is not necessary to provide the first reinforcing member 60A that restrains the deformation of the first internal tooth member 16A.

An example in which the reinforcing member 60 is provided on the outer peripheral portion of the inner tooth member 16 in which the reinforcing member 60 is used, which has the smallest radial distance on the outer side in the radial direction with respect to the inner teeth of the internal tooth member 16. explained. In addition to this, it may be provided on the outer peripheral portion where the radial distance is the smallest on the inner side in the radial direction with respect to the internal teeth of the internal tooth member 16.

When the reinforcing member 60 is composed of a member other than the bearing and the bolt, the reinforcing member 60 may be embedded inside the internal tooth member 16. Further, in this case, the reinforcing member 60 may be provided on the outer peripheral portion of the outer peripheral portion of the internal tooth member 16 in which the reinforcing member 60 is used, whose radial distance is larger than the others. For example, the first reinforcing member 60A may be provided on the second outer peripheral portion 52 or the third outer peripheral portion 54 of the first internal tooth member 16A.

The reinforcing member 60 may have an end shape having an end portion in the circumferential direction. This assumes, for example, a case where the reinforcing member 60 is configured by a C-shaped retaining ring or the like. Further, the reinforcing member 60 may be composed of a plurality of divided bodies in which the ring shape is divided in the circumferential direction.

The reinforcing member 60 is not limited to the metal-based material, and may be made of, for example, a resin-based material. In this case as well, a material having a Young's modulus larger than that of the resin-based material constituting the internal tooth member 16 in which the reinforcing member 60 is used may be used for the reinforcing member 60. In this case, the reinforcing member 60 may use a fiber-reinforced resin composed of a resin-based material common to the internal tooth member 16 as a base and fibers embedded in the base. In this case, the portion where the fiber is embedded becomes the reinforcing member 60. The reinforcing member 60 is not limited to the case where it is composed of a member different from the internal tooth member 16, and may be configured as a part of the same member as the internal tooth member 16.

When the reinforcing member 60 is fitted to the outer peripheral portion of the internal tooth member 16, the groove portion 62 does not have to be formed in the internal tooth member 16.

The reinforcing member 60 may be provided at a position where the reinforcing member 60 does not overlap with the internal teeth of the internal gear 24 in which the reinforcing member 60 is used when viewed from the radial direction.

The embodiments and modifications of the present invention have been described in detail above. The above-described embodiments and modifications are merely specific examples for carrying out the present invention. The contents of the embodiments and modifications do not limit the technical scope of the present invention, and many design changes such as modification, addition, and deletion of components can be made without departing from the idea of the invention. In the above-described embodiment, the contents that can be changed in design are emphasized by adding the description of "the embodiment", but the design change is allowed even in the contents without such notation. Any combination of the above components is also valid as an aspect of the present invention. The hatching attached to the cross section of the drawing does not limit the material of the object to which the hatching is attached.

The present invention relates to a gear device.

10 ... Gear device, 14 ... External tooth gear, 16 ... Internal tooth member, 24 ... Internal tooth gear, 26 ... Propulsion body, 50, 52, 54, 56, 58 ... Outer peripheral part, 60 ... Reinforcing member.

Claims

External gear and
A gear device including an internal tooth member provided with an internal tooth gear that meshes with the external tooth gear.
The internal tooth member is made of a resin-based material.
A reinforcing member for restraining the radial outward deformation of the internal gear due to meshing with the external gear is provided.
The reinforcing member is a gear device provided on the outer peripheral portion of the outer peripheral portion of the internal tooth member, which has the smallest radial distance from the internal teeth of the internal gear.
External gear and
A gear device including an internal tooth member provided with an internal tooth gear that meshes with the external tooth gear.
The internal tooth member is made of a resin-based material.
A reinforcing member for restraining the radial outward deformation of the internal gear due to meshing with the external gear is provided.
The reinforcing member is a gear device composed of a member separate from the bearing and the bolt.
The gear device according to claim 1 or 2, wherein the reinforcing member has an endless ring shape.
The gear device according to any one of claims 1 to 3, wherein the reinforcing member is fitted to the outer peripheral portion of the internal tooth member and is made of a metal-based material.
The gear device according to any one of claims 1 to 4, wherein the reinforcing member is provided at a position overlapping the internal teeth of the internal gear when viewed from the radial direction.
The gear device according to claim 5, wherein the reinforcing member is provided at a position overlapping the overall length of the internal teeth of the internal gear when viewed from the radial direction.
A vibrating body that bends and deforms the external gear is provided.
The internal tooth member
A first internal tooth member provided with a first internal tooth gear that rotates the external tooth gear, and
A second internal tooth member provided with a second internal gear that synchronizes with the rotation component of the external gear is included.
The gear device according to any one of claims 1 to 6, wherein the reinforcing member includes a first reinforcing member that restrains the deformation of the first internal gear in the radial direction.