JP2019086095A - Deflection engagement type gear device - Google Patents

Abstract

To provide a deflection engagement type gear device having a low moment of inertia.SOLUTION: A deflection engagement type gear device (1) comprises a vibrating body shaft (10) comprising a vibrating body (13), an external gear (21) deflected and deformed by the vibrating body (13), internal gears (22 and 23) engaged with the external gear (21), and a vibrating body bearing (30) arranged between the vibrating body (13) and the external gear (21). An outer peripheral surface of the vibrating body (13) constitutes a rolling surface on which a rolling body (31) of the vibrating body bearing rolls. The vibrating body shaft (10) comprises shaft parts (11 and 12) separated from the vibrating body (13) and connected to the vibrating body (13) in an axial direction. The shaft parts (11 and 12) are constituted of a raw material having lower density than that of the vibrating body (13).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible meshed gear device.

  As before, an external gear that is elastically deformed by an exciter, an internal gear that meshes with the external gear, and an elastic gear bearing that includes an exciter bearing that is disposed between the exciter and the external gear. There is a gear system. Further, in the flexible meshed gear device, the exciter bearing does not have a dedicated inner ring, and the outer peripheral surface of the exciter constitutes a rolling surface on which the rolling element of the exciter bearing rolls. (See FIG. 10 of Patent Document 1).

JP, 2017-106626, A

  In the conventional flexible meshing gear device in which the outer peripheral surface of the exciter constitutes the rolling contact surface of the rolling element, the exciter generally has high hardness and high wear resistance so as to withstand surface pressure and wear from the rolling element. It is composed of a metal having

  However, when the exciter is made of a metal having high hardness and high wear resistance, the weight of the exciter increases, and the problem arises that the moment of inertia of the exciter increases.

  In the flexible meshed gear system, the exciter is mainly rotated at high speed, and in comparison with this, the external gear and the internal gear are rotated at very low speed. Therefore, most of the moment of inertia possessed by the flexible meshing gear system is occupied by the moment of inertia of the exciter, and the increase of the moment of inertia of the vibrator similarly sets the overall moment of inertia of the flexible meshing gear system. increase. For this reason, when the moment of inertia of the exciter increases, the driving force required for the motor that outputs power to the flexible meshed gear device, specifically, the driving force required at the time of starting or acceleration / deceleration of the rotational movement And the problem of preventing an increase in power consumption or high speed driving occurs.

  An object of the present invention is to provide a flexible meshed gear device capable of reducing the moment of inertia of a exciter.

The present invention
Between an exciter shaft having an exciter, an external gear that is bent and deformed by the exciter, an internal gear that meshes with the external gear, and a space between the exciter and the external gear A flexible meshed gear device comprising: a exciter bearing to be disposed;
The outer circumferential surface of the exciter constitutes a rolling surface on which rolling elements of the exciter bearing roll.
The exciter shaft has a shaft portion which is connected to the exciter in an axial direction separately from the exciter.
The shaft portion may be a flexible meshed gear device configured of a material having a density smaller than that of the exciter.

  According to the present invention, it is possible to reduce the moment of inertia of the exciter.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the flexible mesh-type gear apparatus of Embodiment 1 which concerns on this invention. Fig. 2 (A) is a front view of the exciter shaft of the first embodiment as viewed from the axial direction, and Fig. 2 (B) is a cross-sectional view taken along the line A-A of Fig. 2 (A). It is sectional drawing which shows the flexible mesh-type gear apparatus of Embodiment 2 which concerns on this invention. 4 (A) is a front view of the exciter shaft of the second embodiment viewed from the axial direction, FIG. 4 (B) is a cross-sectional view taken along the line B-B of FIG. 4 (A), and FIG. 4 (C) is FIG. It is the CC sectional view taken on the line of (B). It is sectional drawing which shows the flexible mesh-type gear apparatus of Embodiment 3 which concerns on this invention. 6 (A) is a front view of the exciter shaft of the third embodiment viewed from the axial direction, FIG. 6 (B) is a cross-sectional view taken along the line DD of FIG. 6 (A), and FIG. It is the EE sectional view taken on the line of (B). It is sectional drawing which shows the flexible mesh-type gear apparatus of Embodiment 4 which concerns on this invention. Fig. 8 (A) is a front view of the exciter shaft of the third embodiment viewed from the axial direction, Fig. 8 (B) is a cross-sectional view taken along the line F-F of Fig. 8 (A), and Fig. 8 (C) is an exciter. It is the front view which looked at the body axis from the side opposite to the direction of an axis.

  Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a flexible meshing gear device of Embodiment 1 according to the present invention. Fig. 2 (A) is a front view of the exciter shaft of the first embodiment as viewed from the axial direction, and Fig. 2 (B) is a cross-sectional view taken along the line A-A of Fig. 2 (A). Hereinafter, a direction along the rotation axis O1 of the flexible meshed gear device 1 is defined as an axial direction, a direction orthogonal to the rotation axis O1 as a radial direction, and a rotation direction around the rotation axis O1 as a circumferential direction.

  The flexible meshed gear device 1 according to the first embodiment of the present invention includes an exciter shaft 10 having shaft portions 11 and 12 and an exciter 13, an external gear 21 flexed and deformed by the exciter 13, and an outer gear Two internal gears 22 and 23 meshing with the tooth gear 21 and a exciter bearing 30 are provided.

  The exciter bearing 30 is, for example, a roller bearing, and a plurality of rolling elements (for example, rollers) 31 and a cage 33 which holds circumferential intervals and axial positions of the plurality of rolling elements 31, external gear An outer race 32 is interposed between the inner circumferential surface of the inner race 21 and the plurality of rolling elements 31. The exciter bearing 30 is disposed between the outer peripheral surface of the exciter 13 and the inner peripheral surface of the external gear 21, and rotatably supports the exciter 13 relative to the external gear 21. . The plurality of rolling elements 31 are arranged side by side in the circumferential direction in a row, and further, the rows are provided in two rows in the axial direction. In addition, the exciter body bearing may be in another form such as, for example, a ball bearing having a rolling element as a ball.

  The exciter 13 has a non-circular (elliptical or the like) portion of the outer peripheral line of a cross section perpendicular to the rotation axis O1, and this portion rotates relative to the external gear 21 to make the external gear The gear 21 is bent and deformed. The exciter 13 has a hollow structure, and the hollow portion enables weight reduction. In addition, members such as wiring and piping are inserted into the hollow portion. The outer peripheral surface of the exciter 13 doubles as the inner ring of the exciter bearing 30, and constitutes a rolling surface on which the rolling element 31 of the exciter bearing 30 contacts and rolls. The material of the exciter 13 is an iron-based metal (for example, steel such as SUJ 2 or carburized steel), and has a density and surface hardness that can withstand surface pressure and wear from the rolling element 31.

  The shaft portions 11 and 12 are members whose outer peripheral lines in a cross section perpendicular to the rotation axis O1 are circular, and are provided on both sides in the axial direction of the exciter 13 separately from the exciter 13. The shaft portions 11 and 12 have a hollow structure, and the hollow portion can reduce the weight. The inner diameter of the shaft portions 11 and 12 is smaller than the inner diameter of the exciter 13. The shaft portions 11 and 12 are made of a material having a density lower than that of the exciter 13, such as aluminum, aluminum alloy, magnesium alloy, or resin such as FRP (Fiber-Reinforced Plastics). The weight reduction of the axial parts 11 and 12 is achieved by being comprised by the low-density material. The surface hardness of the shaft portions 11 and 12 may be lower than that of the outer peripheral surface of the exciter 13.

  Gears are provided at the end of one shaft 11 (the end opposite to the exciter 13) and the end of the other shaft 12 (the end opposite the exciter 13). A plurality of tap holes 113 and 123 are provided to which the members of the previous stage such as pulleys are connected. The plurality of tap holes 113 and 123 are provided at positions different from the insertion holes 112 and 122 for connection described later in the circumferential direction.

  At the both ends where one shaft 11 and the exciter 13 face each other, inlays 111 and 131 inlay-fit with each other and a plurality of insertion holes 112 and 132 for connection are provided. Similarly, at both ends where the exciter 13 and the other shaft 12 face each other, inlay portions 121 and 131 inlay fitting with each other and a plurality of insertion holes 122 and 132 for connection are provided. . Coupling insertion holes 112, 122, 132 are provided axially from the end. Furthermore, the exciter shaft 10 includes a plurality of connecting bodies 101 that connect the exciter 13 and the shaft portions 11 and 12. The connector 101 is a pin (for example, a spring pin) which is press-fitted and fixed to the insertion holes 112, 122, 132.

  The exciter shaft 10 is configured by axially connecting the shaft portions 11 and 12 and the exciter 13. Here, the connection in the axial direction means a mode in which the members A and B are connected without any overlapping portion when viewed in the radial direction. Alternatively, connection in the axial direction means a mode in which when viewed in the radial direction, portions partially overlap but the entire range in one axial direction of the member A and the member B is connected without overlapping with the other. .

  When assembling the exciter shaft 10, the connector 101 is pressed into the insertion hole 132 of the exciter 13, and one end of the connector 101 is exposed to the outside from the insertion hole 132. And the ends of the shanks 11 and 12 are butted. The exposed portion of the connector body 101 is press-fit into the insertion holes 112 and 122 of the shaft portions 11 and 12, and the inlay portion 131 of the exciter 13 and the inlay portions 111 and 121 of the shaft portions 11 and 12 are inlays. To fit. By the in-row fitting, the exciter 13 and the shafts 11 and 12 are accurately positioned, and the connector 101 connects the exciter 13 and the shafts 11 and 12 with high strength. In addition, a sealing material such as liquid packing is provided on a connection surface between the shaft 11 and the exciter 13 and a connection surface between the shaft 12 and the exciter 13.

  The flexible meshed gear device 1 further includes a first connecting member 41 integrated with the internal gear 22, a second connecting member 42 integrated with the internal gear 23, a casing member 43, and lids 44 and 45. , Main bearing 51 and bearings 52, 53.

  The first connection member 41 is annular, and one internal gear 23 is provided on a part of the inner peripheral surface. The second connection member 42 is annular, and the other internal gear 22 is provided on a part of the inner peripheral surface. The internal gears 22 and 23 have rigidity and mesh with a part of the external gear 21, and the rotational movement is transmitted by changing the meshing point due to the bending deformation of the external gear 21.

  The casing member 43 is connected to the first connection member 41 and covers the outer peripheral portion of the second connection member 42. One lid 44 has an annular form and is connected to the first connection member 41 to cover one of the exciter bearing 30 and the external gear 21 in the axial direction. Further, the cover 44 covers the outer peripheral side of the shaft portion 11 of the exciter shaft 10. The other lid 45 has an annular form and is connected to the second connection member 42 to cover the other of the exciter bearing 30 and the external gear 21 in the axial direction. In addition, the lid 45 covers the outer peripheral side of the shaft portion 12 of the exciter shaft 10.

  The main bearing 51 is disposed between the casing member 43 and the second connection member 42, and rotatably supports the second connection member 42 with respect to the casing member 43. The bearings 52 and 53 are disposed between the lids 44 and 45 and the shafts 11 and 12 of the exciter shaft 10, respectively, and rotatably support the shafts 11 and 12 with respect to the lids 44 and 45. .

<Description of operation>
In the above-described configuration, typically, the exciter shaft 10 is an input shaft, the first connecting member 41 having one internal gear 22 is an output shaft, and the other has an internal gear 23. The connection member 42 is used by being fixed to the external support member of the flexible meshed gear device 1. Furthermore, the number of teeth of one internal gear 22 and the number of teeth of the external gear 21 are set to be the same, and the number of teeth of the other internal gear 23 and the number of teeth of the external gear 21 are set to be different. Ru.

  When rotational motion is input from the outside and the exciter shaft 10 is rotated, the motion of the exciter shaft 10 is transmitted to the external gear 21 through the exciter bearing 30. At this time, since the external gear 21 is partially engaged with the fixed internal gear 23, the external gear 21 does not rotate following the rotation of the exciter shaft 10, and thus the excitation is generated. The body shaft 10 rotates relatively inside the external gear 21. Furthermore, since the external gear 21 is regulated along the outer peripheral surface of the exciter 13, the external gear 21 is bent and deformed as the exciter shaft 10 rotates. The period of this deformation is proportional to the period of rotation of the exciter shaft 10.

  When the external gear 21 is deformed by the rotation of the exciter shaft 10, the large diameter portion of the exciter 13 moves in the rotational direction, whereby the meshing position of the external gear 21 and the internal gear 23 is rotated. Change in the direction. Since there is a difference in the number of teeth of the external gear 21 and the internal gear 23, the meshing teeth of the external gear 21 and the internal gear 23 are shifted each time the meshing position makes one rotation, whereby the outside The tooth gear 21 rotates (rotation). For example, if the number of teeth of the internal gear 23 is 102 and the number of teeth of the external gear 21 is 100, the rotational movement of the exciter shaft 10 is decelerated at a reduction ratio of 100: 2 and transmitted to the external gear 21 Be done.

  On the other hand, since the external gear 21 meshes with the internal gear 22 in the same manner, the rotation position of the external gear 21 and the internal gear 22 also changes in the rotational direction as the exciter shaft 10 rotates. Since the number of teeth of the internal gear 22 and the number of teeth of the external gear 21 are the same, the external gear 21 and the internal gear 22 do not rotate relative to each other, and the rotational movement of the external gear 21 has a reduction ratio It is transmitted to the internal gear 22 at 1: 1. By these, the rotational movement of the exciter shaft 10 is decelerated and output to the first connection member 41 which is an output shaft. The reduction ratio can be changed by setting the number of teeth of the external gear 21 and the internal gears 23, 22. Further, the components used as the input shaft, the components used as the output shaft, and the components fixed to the support member are not limited to the above examples, and the exciter shaft 10, one internal gear 22 and the other It may be arbitrarily changed between the internal gear 23.

  When the flexible meshing gear device 1 rotates, in addition to the input torque according to the load, the friction loss and the resistance according to the grease stirring loss of the flexible meshing gear device 1, and the flexible meshing gear An input torque is required to compensate for the change in inertial energy of the device 1. In the flexible meshed gear device 1, the exciter shaft 10 rotates at a very high speed with respect to the rotation of the external gear 21 or the internal gears 22, 23. Therefore, the ratio of the moment of inertia of the exciter shaft 10 to the total moment of inertia of the flexible meshed gear device 1 is very large (for example, 80% or more). Therefore, when the moment of inertia of the exciter shaft 10 is increased, the total moment of inertia of the flexible meshing gear device 1 is increased at the same ratio, and the rotational motion of the flexible meshing gear device 1 is started or During acceleration and deceleration, a large input torque is required.

  However, in the flexible meshed gear device 1 according to the first embodiment, the exciter shaft 10 is configured such that the exciter 13 and the shaft portions 11 and 12 are axially connected. The exciter 13 is made of a material sufficiently resistant to the surface pressure and friction from the rolling element 31 of the exciter bearing 30, while the shaft portions 11 and 12 are materials having a density lower than that of the exciter 13. Configured As a result, without reducing the durability of the exciter shaft 10, the moment of inertia of the exciter shaft 10 is 1/1, compared with the conventional configuration in which the shaft portion and the exciter shaft are integrated, for example. It can be reduced to about three. Therefore, at the start of rotational movement or during acceleration / deceleration, similar rotational movement can be transmitted with a small input torque as compared with the conventional configuration.

  As described above, according to the flexible meshing gear device 1 of the first embodiment, the inertia moment thereof can be reduced without decreasing the durability of the exciter shaft 10. Therefore, it is possible to reduce the power consumption of the entire system including the flexible meshed gear device 1 and the motor generating the rotational movement or to increase the rotational movement speed while maintaining the durability.

  Further, according to the flexible meshing gear device 1 of the first embodiment, the exciter shaft 10 has the hollow shaft-shaped shaft portions 11 and 12 and the hollow shaft exciter 13. If the shaft portion and the exciter are integrally processed, the axially elongated exciter shaft is provided with a hollow portion that is long in the axial direction, which increases the degree of difficulty in processing and increases the processing cost. On the other hand, in the configuration of the first embodiment, the hollow portions may be separately processed in the shaft portions 11 and 12 and the exciter 13, and the processing difficulty can be reduced. Therefore, the hollow portion can be processed at low processing cost and with high accuracy, and furthermore, the diameter of the hollow portion can be increased. By increasing the diameter of the hollow portion, the moment of inertia of the exciter shaft 10 can be further reduced.

  Also, in general, the rotary shaft may be passed through the hollow portion of the exciter shaft, and both may be fitted and used. In such a case, it is necessary to increase the inner diameter of the hollow portion of the exciter shaft in the axial direction so that the rotation axis passes smoothly through the hollow portion. In the case of a conventional exciter shaft in which the shaft portion and the exciter are integrally processed, such processing is difficult and the processing cost is increased. However, according to the flexible meshing gear device 1 of the first embodiment, by processing the shaft portions 11 and 12 and the exciter 13 separately, the hollow having a large inner diameter in the axial center range as described above The part can be easily formed.

Second Embodiment
FIG. 3 is a cross-sectional view showing a flexible meshing gear device of Embodiment 2 according to the present invention. 4 (A) is a front view of the exciter shaft of the second embodiment viewed from the axial direction, FIG. 4 (B) is a cross-sectional view taken along the line B-B of FIG. 4 (A), and FIG. 4 (C) is FIG. It is the CC sectional view taken on the line of (B).

  The flexible meshed gear device 1A of the second embodiment differs from the first embodiment in the connection structure of the exciter shaft 10A. About the component same as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The exciter shaft 10A of the second embodiment includes an exciter 13A, shaft portions 11A and 12A, and a plurality of connecting bodies 101A that connect these.

  The exciter 13A has a hollow structure, and the outer peripheral line of the cross section perpendicular to the rotation axis O1 has a non-circular (eg, oval) portion, and this portion is disposed inward of the external gear 21. . The outer peripheral surface of the exciter 13 doubles as the inner ring of the exciter bearing 30, and constitutes a rolling surface on which the rolling element 31 contacts and rolls. The material of the exciter 13A is an iron-based metal (for example, steel such as SUJ2), and has a density and surface hardness that can withstand surface pressure and wear from the rolling element 31.

  At both axial end portions of the exciter 13A, small diameter portions W1 and W2 having circular outlines in cross section perpendicular to the axial direction are provided so as to be continuous with the outer peripheral surfaces of the shaft portions 11A and 12A. In the exciter shaft 10A, the small diameter portions W1 and W2 of the exciter 13A and the end portions of the shaft portions 11A and 12A continuous thereto are rotatably supported by bearings 52 and 53.

  The shaft portions 11A and 12A are hollow members having a circular outer peripheral line in a cross section perpendicular to the rotation axis O1, and are provided separately on both sides in the axial direction of the exciter 13A. Be The inner diameter of the shaft portions 11A and 12A is smaller than the inner diameter of the exciter 13A. The shaft portions 11A and 12A are made of, for example, a material having a density lower than that of the vibrator 13A, such as aluminum, an aluminum alloy, a magnesium alloy, or a resin such as FRP. The weight reduction of axial part 11A, 12A is achieved more by being comprised by the material with a low density. The shaft portions 11A and 12A may have lower surface hardness than the outer peripheral surface of the exciter 13A.

  At an end of one shaft 11A (an end opposite to the exciter 13A), there are provided a plurality of tap holes 113A to which members of preceding stages, such as gears and pulleys, are connected. The tap holes 113A are provided at positions different in the circumferential direction from connection through holes 112A and 122A to be described later. Although not shown, a plurality of tap holes are similarly provided at the end of the other shaft 12A (the end opposite to the exciter 13A).

  The exciter 13 and the shaft portions 11A and 12A are provided with a plurality of through holes 132A, 112A and 122A for connection, which penetrate these in the axial direction. The through holes 132A, 112A, 122A are provided at the same position in the circumferential direction. The end face where the exciter 13A and the shaft portion 11A face each other, and the end face where the exciter 13A and the shaft portion 12A face each other are planar. The through holes 112A, 122A, 132A correspond to an example of the insertion hole according to the present invention.

  The connector 101A is a member such as a knock pin that enables highly accurate positioning and high-strength connection.

  The exciter shaft 10A is configured by axially connecting the shaft portions 11A and 12A and the exciter 13A. In assembling the exciter shaft 10A, the connector 101A is press-fit to both ends of the through hole 132A of the exciter 13A, and one end of the connector 101A is exposed to the outside from the through hole 132A. The end and the end of the shank 11A, 12A are butted. Then, the exposed portions of the connector 101A are press-fit into the through holes 112A and 122A of the shaft portions 11A and 12A. Such connection achieves highly accurate positioning and high strength connection.

  As described above, according to the flexible meshing gear device 1A of the second embodiment, as in the first embodiment, the exciter 13A is configured to sufficiently withstand the surface pressure and the friction from the rolling elements 31, and The moment of inertia of the vibrator shaft 10A can be reduced. Therefore, the power consumption of the entire system including the flexible meshing gear device 1A and the motor generating the rotational movement is reduced or the rotational movement speed is increased without reducing the durability of the flexible meshing gear device 1A. be able to.

  Furthermore, according to the flexible meshing gear device 1A of the second embodiment, the exciter shaft 10A is divided in the axial direction. Thus, as in the first embodiment, the hollow portion of the exciter shaft 10A can be provided with high accuracy and low processing cost, and the diameter of the hollow portion is increased to make the moment of inertia of the exciter shaft 10A Can be further reduced. In addition, it is possible to provide a hollow portion having a shape which is difficult to integrally process such that the inner diameter becomes large in the axial center range of the exciter shaft 10A at low processing cost.

  Furthermore, according to the flexible meshing gear device 1A of the second embodiment, since the exciter shaft 10A is divided in the axial direction, it is difficult to process the axial hole in the side wall of the exciter shaft 10A. It can be lowered. Thereby, the location into which the connector 101A is press-fitted can be set as the through holes 112A, 122A, and 132A. Further, the weight of the shaft portions 11A, 12A and the exciter 13A can be further reduced by the portions of the through holes 112A, 122A, 132A not occupied by the connector 101A. Thus, the moment of inertia of the exciter shaft 10A can be further reduced.

(Embodiment 3)
FIG. 5 is a cross-sectional view showing a flexible meshing gear device according to a third embodiment of the present invention. 6 (A) is a front view of the exciter shaft of the third embodiment viewed from the axial direction, FIG. 6 (B) is a cross-sectional view taken along the line DD of FIG. 6 (A), and FIG. It is the EE sectional view taken on the line of (B).

  The flexible meshed gear device 1B of the third embodiment is different from that of the first embodiment in the connection structure of the exciter shaft 10B. About the component same as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The exciter shaft 10B of the third embodiment includes an exciter 13B, shaft portions 11B and 12B, and a plurality of connecting bodies 101B that connect these.

  The exciter 13B has a hollow structure, and the outer peripheral line of the cross section perpendicular to the rotation axis O1 has a non-circular (elliptical or other) portion, and this portion is disposed inward of the external gear 21. . The outer peripheral surface of the exciter 13 doubles as the inner ring of the exciter bearing 30, and constitutes a rolling surface on which the rolling element 31 contacts and rolls. The material of the exciter 13B is an iron-based metal (for example, steel such as SUJ2), and has a density and surface hardness that can withstand surface pressure and wear from the rolling element 31.

  At both end portions in the axial direction of the exciter 13B, small diameter portions W1 and W2 having circular outlines in cross section perpendicular to the axial direction are provided so as to be continuous with the outer peripheral surfaces of the shaft portions 11B and 12B. In the exciter shaft 10B, bearings 52 and 53 rotatably support the small diameter portions W1 and W2 of the exciter 13B and the end portions of the shaft portions 11B and 12B continuous with the small diameter portions W1 and W2.

  The shaft portions 11B and 12B are hollow members having a circular outer peripheral line with a cross section perpendicular to the rotation axis O1, and are provided separately on both sides in the axial direction of the exciter 13B separately from the exciter 13B. Be The inner diameter of the shaft portions 11B and 12B is smaller than the inner diameter of the exciter 13B. The shaft portions 11B and 12B are made of, for example, a material having a density lower than that of the vibrator 13B, such as aluminum, an aluminum alloy, a magnesium alloy, or a resin such as FRP. The weight reduction of axial part 11B, 12B is achieved more by being comprised by the material with a low density. The surface hardness of the shaft portions 11B and 12B may be lower than that of the outer peripheral surface of the exciter 13B.

  A plurality of insertion holes 132B, 112B, 122B for coupling are provided at the end where the exciter 13B and one shaft 11B face each other and at the end where the exciter 13B and the other shaft 12B face each other. It is provided in the direction. The end face where the exciter 13B and the shaft 11B face each other, and the end face where the exciter 13B and the shaft 12B face each other are planar.

  At an end of one shaft 11B (an end opposite to the exciter 13B), there are provided a plurality of tap holes 113B to which members of preceding stages such as gears, pulleys and the like are connected. The tap holes 113B are provided at positions different from the insertion holes 112B and 122B for connection in the circumferential direction. Similarly, a plurality of tap holes 123B are provided at the end of the other shaft 12B (the end opposite to the exciter 13B).

  Furthermore, the through-hole 134 which penetrates in the axial direction and into which another member is not inserted is provided in the side wall part of the exciter 13B. The through hole 134 is provided at a position different from the insertion hole 132B for connection in the circumferential direction, for example, at a position overlapping the tap holes 113B and 123B of the shaft portions 11B and 12B when viewed in the axial direction. By removing the weight by the through holes 134, the weight of the exciter 13B can be reduced. The through hole 134 may be replaced by an axial hole which does not penetrate at one end. The through hole 134 corresponds to an example of the “hole into which another member is not inserted” according to the present invention.

  The connector 101B is a member such as a knock pin that enables highly accurate positioning and high strength connection.

  The exciter shaft 10B is configured by axially connecting the shaft portions 11B and 12B and the exciter 13B. In assembling the exciter shaft 10B, the exciter 13B is inserted with the connector 101B pressed into the insertion hole 132B for connection of the exciter 13B and one end of the connector 101B is exposed to the outside from the insert hole 132B. And the ends of the shanks 11B and 12B are butted. Then, the exposed portion of the connector 101 is press-fit into the connecting holes 112B and 122B for connecting the shaft portions 11B and 12B. Such connection achieves highly accurate positioning and high strength connection.

  As described above, according to the flexible meshing gear device 1B of the third embodiment, as in the first embodiment, the exciter 13B is configured to sufficiently withstand the surface pressure and the friction from the rolling elements 31, and The moment of inertia of the vibrator shaft 10B can be reduced. Therefore, the power consumption of the entire system including the flexible meshing gear device 1B and the motor generating the rotational movement is reduced or the rotational movement speeded up without reducing the durability of the flexible meshing gear device 1B. be able to.

  Furthermore, according to the flexible meshing gear device 1B of the third embodiment, the exciter shaft 10B is divided in the axial direction. Thus, as in the first embodiment, the hollow portion of the exciter shaft 10B can be provided with high accuracy and low processing cost, and the diameter of the hollow portion is increased to make the moment of inertia of the exciter shaft 10B. Can be further reduced. In addition, it is possible to provide a hollow portion having a shape which is difficult to integrally process such that the inner diameter becomes large in the axial center range of the exciter shaft 10B, at low processing cost.

  Furthermore, according to the flexible meshing gear device 1B of the third embodiment, the weight of the exciter 13B is further reduced by thinning the side wall of the exciter 13B by the through hole 134, and the exciter shaft 10B The moment of inertia of can be made smaller. By setting the configuration for thinning as holes instead of grooves, it is possible to suppress a decrease in the rigidity of the exciter 13B.

(Embodiment 4)
FIG. 7 is a cross-sectional view showing a flexible meshing gear device of Embodiment 4 according to the present invention. 8 (A) is a front view of the exciter shaft of the third embodiment viewed from the axial direction, FIG. 8 (B) is a cross-sectional view taken along line F-F of FIG. 8 (A), and FIG. It is the front view which looked at the body axis from the side opposite to the direction of an axis.

  The flexible meshed gear device 1C of the fourth embodiment is different from that of the first embodiment in the connection structure of the exciter shaft 10C. About the component same as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The exciter shaft 10C of the fourth embodiment includes an exciter 13C, shaft portions 11C and 12C, and a plurality of connecting bodies 101C that connect these. The connector 101C corresponds to an example of the first bolt according to the present invention.

  The exciter 13C has a hollow structure, and the outer peripheral line of the cross section perpendicular to the rotation axis O1 has a non-circular (elliptical or other) portion, and this portion is disposed inward of the external gear 21. . The outer peripheral surface of the exciter 13 doubles as the inner ring of the exciter bearing 30, and constitutes a rolling surface on which the rolling element 31 contacts and rolls. The material of the exciter 13C is an iron-based metal (for example, steel such as SUJ2), and has a density and surface hardness that can withstand contact pressure and wear from the rolling element 31.

  The shaft portions 11C and 12C are hollow members having a circular outer peripheral line in a cross section perpendicular to the rotation axis O1 and provided separately on both sides in the axial direction of the exciter 13C. Be The inner diameters of the shaft portions 11C and 12C are smaller than the inner diameter of the exciter 13C. The shaft portions 11C and 12C are made of a material having a density lower than that of the vibrator 13C, such as aluminum, an aluminum alloy, a magnesium alloy, or a resin such as FRP. The weight reduction of the shaft parts 11C and 12C is further achieved by being made of a material having a low density. The surface hardness of the shaft portions 11C and 12C may be lower than that of the outer circumferential surface of the exciter 13C.

  At the end where one shaft portion 11C and the exciter 13C face each other, inlay portions 111C and 131C are provided to be inlay-fitted with each other. Similarly, at the end where the exciter 13C and the other shaft 12C face each other, inlays 121C and 131C are provided to be inlay-fitted with each other.

  Further, the shaft portions 11C and 12C and the exciter 13C are provided with a plurality of through holes 112C, 122C and 132C for connection, which penetrate in the axial direction and into which the connector 101C is inserted. An accommodation hole 115 for accommodating a bolt head is provided at one end (corresponding to a first end according to the present invention) of the connecting through holes 112C, 122C, 132C, and the opposite side of the accommodation hole 115 An internal thread is provided in the range W6. The female screw is provided in the through hole 122C of the shaft 12C. A part of the connecting through-hole 132C of the exciter 13C may be exposed in the hollow portion of the exciter 13C. In the case of the exposed configuration, the connector 101C is exposed to the inside of the exciter 13C through this portion. With such a configuration, it is possible to further reduce the weight of the exciter shaft 10C and to further reduce the moment of inertia of the exciter shaft 10C while maintaining the strength of connection. The through holes 112C, 122C, 132C correspond to an example of the insertion hole according to the present invention.

  In addition, the shaft portions 11C and 12C and the exciter 13C are provided with a plurality of through holes 117, 127 and 137 for lightening. The through holes 117, 127, and 137 are provided at positions different from the through holes 112C, 122C, and 132C for connection in the rotational direction. By setting the configuration for lightening as a through hole instead of the groove, it is possible to suppress a decrease in the rigidity of the exciter shaft 10C by the configuration for lightening. The through holes 117, 127, and 137 correspond to an example of the "hole into which another member is not inserted" according to the present invention.

  The connecting body (bolt) 101C has a length such that it can be screwed halfway into the female screw of the shaft portion 12C.

  The exciter shaft 10C is configured by axially connecting the shaft portions 11C and 12C and the exciter 13C. When assembling the exciter shaft 10C, the exciter 13C and the shaft 11C as well as the exciter 13C and the shaft 12C are butted so that the inlays 111C, 121C, and 131C are inlay-fitted. Then, the connector (bolt) 101C is inserted into the through holes 112C, 122C, 132C, and screwed with the female screw of the through hole 122C. The exciter 13C and the shaft portions 11C and 12C are accurately positioned by in-row fitting, and the exciter 13C and the shaft portions 11C and 12C are connected with high strength by the connector 101C.

  As described above, according to the flexible meshing gear device 1C of the fourth embodiment, as in the first embodiment, while the exciter 13C is configured to sufficiently withstand the surface pressure and the friction from the rolling elements 31, The moment of inertia of the vibrator shaft 10C can be reduced. Therefore, the power consumption of the entire system including the flexible meshing gear device 1C and the motor generating the rotational movement is reduced or the rotational movement speeded up without reducing the durability of the flexible meshing gear device 1C. be able to.

  Furthermore, according to the flexible meshing gear device 1C of the fourth embodiment, the exciter shaft 10C is divided in the axial direction. Thus, as in the first embodiment, the hollow portion of the exciter shaft 10C can be provided with high accuracy and low processing cost, and the diameter of the hollow portion is increased to make the moment of inertia of the exciter shaft 10C Can be further reduced. In addition, it is possible to provide a hollow portion having a shape that is difficult to integrally process such that the inner diameter increases in the axial center range of the exciter shaft 10C, at low processing cost.

  Furthermore, according to the flexible meshing gear device 1 of the fourth embodiment, since the exciter shaft 10C is divided in the axial direction, it is difficult to process the hole in the axial direction through the side wall of the exciter shaft 10C. It can be lowered. This facilitates the formation of the through holes 112C, 122C, 132C through which the connector 101C passes. Further, the formation of the through holes 117, 127, and 137 for lightening can be facilitated, and the moment of inertia of the exciter shaft 10C can be further reduced.

  Furthermore, according to the flexible meshing gear device 1 of the fourth embodiment, in a range from the end (corresponding to the second end according to the present invention) of the through hole 122C on the opposite side of the exciter 13C, The part of the female screw is open. And this part can be utilized as a tap hole to which the member of the front | former stage, such as a gearwheel and a pulley, is connected. FIG. 7 shows an example in which the pulley 61 as a separate member is attached by the second bolt 62 using the through hole 122C.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, the exciter shaft has been described as having a structure in which the shaft portion is connected to both sides of the exciter, but in the case of the exciter shaft, the exciter and one shaft portion are axially connected It may be configured as Further, although the flat type flexible meshing gear device has been described as an example in the above embodiment, the flexible meshing gear device of the present invention is, for example, a cup type, a top hat type, etc. It is applicable to a gear train. Other details described in the embodiment can be appropriately changed without departing from the scope of the invention.

1, 1A, 1B, 1C flexible mesh type gear device 10, 10A, 10B, 10C exciter shaft 11, 11A, 11B, 11C, 12, 12A, 12B, 12C shaft part 13, 13A, 13B, 13C excitation Body 21 external gear 22, 23 internal gear 30 exciter bearing 31 rolling element 52, 53 bearing 61 pulley 62 second bolt 101, 101A, 101B connecting body 101C connecting body (first bolt)
111, 121, 131 Inlay parts 112, 122, 132, 112B, 122B, 132B Insertion holes 112A, 122A, 132A, 112C, 122C, 132C Through holes W6 Ranges where female threads are formed 117, 127, 137, 134 Through holes (A hole where another member is not inserted)

Claims (7)

Between an exciter shaft having an exciter, an external gear that is bent and deformed by the exciter, an internal gear that meshes with the external gear, and a space between the exciter and the external gear A flexible meshed gear device comprising: a exciter bearing to be disposed;
The outer circumferential surface of the exciter constitutes a rolling surface on which rolling elements of the exciter bearing roll.
The exciter shaft has a shaft portion which is connected to the exciter in an axial direction separately from the exciter.
The shaft portion is made of a material having a density smaller than that of the exciter.
Flexible meshing gear unit. The exciter has a surface hardness higher than that of the shaft portion.
The flexible meshed gear device according to claim 1. The exciter and the shaft portion are provided with inlay portions for inlay engagement with each other,
The flexible meshed gear device according to claim 1 or 2. And a connector inserted into an insertion hole provided in both the exciter and the shaft,
The coupling body is exposed to the inside of one of the exciter and the shaft,
The flexible meshed gear device according to any one of claims 1 to 3. The exciter and the shaft have a hollow structure,
The inner diameter of the exciter is larger than the inner diameter of the shaft portion,
The flexible meshed gear device according to any one of claims 1 to 4. A through hole axially passing through the exciter and the shaft;
A female screw provided in at least one of the through hole of the exciter and the through hole of the shaft;
And further
The exciter and the shaft are connected by a first bolt inserted from a first end opposite to the side where the female screw is provided in the exciter and the through hole of the shaft. A separate member is fixed to the exciter shaft by a second bolt inserted from a second end opposite to the first end of the through hole.
The flexible meshed gear device according to any one of claims 1 to 5. At least one of the exciter and the shaft has a hole into which another member is not inserted.
The flexible meshed gear device according to any one of claims 1 to 6.

Images