CN211288683U - Mounting structure - Google Patents

Abstract

Provided is a mounting structure having a mounting object, a mounted shaft, and a rotation stop plate. The mounting object has a circular hole in the center. The mounted shaft has a rotation stopper portion having a non-perfect circle shape when viewed in an axial direction on an outer peripheral surface thereof. The rotation stopping plate has a rotation stopping hole of a non-perfect circle shape in the central part. The rotation stopping hole has at least one linear first side portion. The rotation stopper has at least one linear second side portion. The rotation stopper is fixed to the mounting object coaxially with the mounting object, and the mounting object is fitted to the outside of the shaft to be mounted in the radial direction in a state where the phase position of the first side portion and the phase position of the second side portion coincide with each other.

Description

Mounting structure

Technical Field

The utility model relates to an installation structure.

Background

Conventionally, various mounting structures for mounting an object to be mounted on an object to be mounted so as to be incapable of relative rotation have been proposed. Such a mounting structure is disclosed in, for example, japanese patent laid-open No. 2016-1699778.

The motor drive device for a vehicle disclosed in japanese patent application laid-open No. 2016-1699778 has a rotation stop mechanism for preventing relative rotation between a case and a reduction gear case at an opposing portion where the case and the reduction gear case oppose each other. The rotation stopping mechanism includes an engaged portion provided on at least one of the housing and the reduction gear case and an engaging portion engaged with the engaged portion. The engaging portion penetrates one of the housing and the reducer case in the axial direction.

In the detent mechanism described in japanese patent application laid-open No. 2016 and 1699778, since the engaging portion penetrates one of the housing and the gear case in the axial direction, it is difficult to reduce the thickness of the housing and the gear case.

In particular, in recent years, when the object to be mounted is a hollow cylindrical member such as a power input shaft of a speed reducer, for example, there is a demand for passing a large amount of wiring or the like through the hollow portion, and therefore, there is a case where the object to be mounted is required to be thin and have an enlarged inner diameter. However, in this case, it is difficult to apply the rotation stopping mechanism disclosed in japanese patent application laid-open No. 2016-1699778, and a new rotation stopping mechanism technology that can be applied to a thin-walled object to be mounted is desired.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above circumstances, and a potential object of the present invention is to provide an attachment structure and an attachment method that can attach an attachment object to a cylindrical attached shaft so as not to be relatively rotatable and can make the attached shaft thin.

As described above, the means for solving the problem will be described below.

In a first exemplary embodiment of the present invention, there is provided an attachment structure having an attachment object, a cylindrical attached shaft, and a rotation stop plate. The mounting object has a circular hole in the center. The cylindrical mounted shaft has a rotation stopper portion on an outer peripheral surface, the rotation stopper portion having a non-perfect circle shape when viewed in an axial direction. The rotation stopping plate is plate-shaped and has a non-circular rotation stopping hole in the central part. The rotation stopping hole has at least one linear first side portion. The rotation stopper has at least one linear second side portion. The rotation stopper is fixed to the mounting object coaxially with the mounting object, and the mounting object is fitted to the outside of the shaft to be mounted in the radial direction in a state where the phase position of the first side portion and the phase position of the second side portion coincide with each other.

According to a first exemplary embodiment of the present invention, there is provided an installation structure and an installation method that can install an object to be installed on a cylindrical installed shaft so as not to be relatively rotatable, and can reduce the thickness of the installed shaft.

In an exemplary second invention, according to the mounting structure described in the first invention, the rotation stopping hole has a plurality of first edge portions, and the rotation stopping portion has a plurality of second edge portions.

In the third exemplary embodiment of the present invention, the mounting structure according to the second exemplary embodiment is characterized in that the plurality of first side portions are provided at equal intervals in the circumferential direction, and the plurality of second side portions are provided at equal intervals in the circumferential direction.

In the fourth exemplary embodiment of the present invention, the rotation stopping hole is formed in a shape of rotational symmetry, and the rotation stopping portion is formed in a shape of rotational symmetry, according to the mounting structure described in the third exemplary embodiment.

In an exemplary fifth aspect of the present invention, the mounting structure according to any one of the first to fourth aspects is characterized in that at least a part of the first side portion is disposed radially inward of the circular hole of the mounting object when viewed in the axial direction.

In an exemplary sixth invention according to the present invention, the mounting structure according to any one of the first to fourth inventions is characterized in that the mounting object has a concave portion which is recessed in the axial direction at a terminal surface of one side, and the rotation stopping plate is mounted to the mounting object in a state of being fitted into the concave portion.

In the seventh exemplary embodiment of the present invention, the mounting structure described in any one of the first to fourth exemplary embodiments is characterized in that the mounted shaft is a power input shaft of the speed reducer.

In an exemplary eighth invention according to the present invention, the mounting structure according to any one of the first to fourth inventions is characterized in that the mounting object is a gear.

In an exemplary ninth aspect of the present invention, the mounting structure according to any one of the first to fourth aspects is characterized in that the mounting object is fitted into the radial outer side of the mounted shaft by thermal press fitting.

The above and other features, elements, steps, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention when taken in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a longitudinal sectional view showing the overall structure of an internal planetary type reduction gear having a mounting structure according to the present embodiment.

Fig. 2 is a sectional view taken along line II-II in fig. 1, showing the appearance of the engaging portion.

Fig. 3 is an exploded perspective view showing the mounting structure of the present embodiment.

Fig. 4 is a sectional view of the mounting structure as viewed in the axial direction.

Fig. 5 is a diagram illustrating a process of the mounting method of the present embodiment.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a direction parallel to the central axis of the reduction gear is referred to as an "axial direction", a direction perpendicular to the central axis is referred to as a "radial direction", and a direction along an arc centered on the central axis is referred to as a "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction. The "vertical direction" also includes a substantially vertical direction.

< 1. integral Structure of speed reducer

Fig. 1 is a longitudinal sectional view showing a reduction gear 1 having a mounting structure 90 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of the speed reducer 1 viewed from a position II-II in fig. 1.

The reduction gear 1 converts a rotational motion at a first rotational speed (input rotational speed) into a rotational motion at a second rotational speed lower than the first rotational speed by a gear-type reduction mechanism, and further converts the rotational motion at the second rotational speed into a rotational motion at a third rotational speed (output rotational speed) lower than the second rotational speed by an internal planetary reduction mechanism. The speed reducer 1 is applied to, for example, a joint of a small robot such as a service robot that performs work in cooperation with a human. However, the reduction gear having the same structure may be used for other applications such as a large industrial robot, a machine tool, an X-Y table, a material cutting device, a conveyor line, a rotary table, and a roll.

As shown in fig. 1, the reduction gear 1 of the present embodiment mainly includes a first rotating portion 5, a second rotating portion 10, two eccentric portions 20, two external-tooth gears 30, two first bearings 41, a frame 50, a plurality of internal-tooth pins 60, a plurality of carrier pins 70, a third rotating portion 80, and a housing 6.

The first rotating portion 5 is a substantially columnar member extending in the axial direction at a position radially spaced from the central axis C of the second rotating portion 10. A first gear 8 is provided at one axial end of the first rotating portion 5. The first gear 8 has a plurality of external teeth. The first rotating portion 5 is connected to a motor as a driving source directly or via another power transmission mechanism. When the motor is driven, the first rotating portion 5 rotates at a first rotational speed around the axis by power supplied from the motor. That is, in the present embodiment, the first rotating portion 5 serves as an input portion. The first rotating portion 5 is disposed radially inward of the housing 6.

The second rotating portion (mounted shaft) 10 is a cylindrical member extending along the center axis C. The other end of the second rotating portion 10 in the axial direction is disposed radially inward of the housing 6. On the radially inner side of the housing 6, a second gear (object to be mounted) 91 is coaxially mounted on the second rotating portion 10 and fixed to the second rotating portion 10. The number of external teeth of the second gear 91 is larger than that of the external teeth of the first gear 8. The first gear 8 and the second gear 91 mesh with each other, and the second rotating portion 10 rotates around the central axis C at a second rotation speed lower than the first rotation speed. The mounting structure of the second gear 91 to the second rotating portion 10 will be described in detail later.

The eccentric portion 20 rotates together with the second rotating portion 10 at the same rotational speed as the second rotating portion 10. The two eccentric portions 20 are disposed at intervals in the axial direction on the outer peripheral portion of the second rotating portion 10. In the present embodiment, the second rotating portion 10 and the two eccentric portions 20 are formed of a single member. However, the second rotating portion 10 and the two eccentric portions 20 may not be a single component. The two eccentric portions 20 each have a cylindrical outer peripheral surface centered on an eccentric shaft D extending in parallel with the central axis C at a position offset from the central axis C. Therefore, the distance from the center axis C to the outer peripheral surface of the eccentric portion 20 differs depending on the position in the circumferential direction. When the second rotating portion 10 rotates about the central axis C, the positions of the two eccentric portions 20 rotate about the central axis C. At this time, the eccentric shafts D of the eccentric portions 20 also rotate about the central axis C.

In the present embodiment, the position of the eccentric axis D of one eccentric portion 20 and the position of the eccentric axis D of the other eccentric portion 20 are separated from each other by 180 ° with respect to the center axis C. Thus, the center of gravity of the two eccentric portions 20 as a whole is always located on the center axis C. Therefore, the swing of the center of gravity due to the rotation of the eccentric portion 20 can be suppressed.

The two external gears 30 are disposed radially outward of the eccentric portion 20, respectively. The first bearing 41 is interposed between the eccentric portion 20 and the external gear 30. As the first bearing 41, a known bearing such as a roller bearing can be used. The external gear 30 is supported by the first bearing 41 so as to be rotatable about the eccentric shaft D. As shown in fig. 2, a plurality of external teeth 31 are provided on the outer peripheral portion of the external gear 30. Each external tooth 31 protrudes outward in the radial direction. Further, an inter-outer-tooth groove 32 that is recessed radially inward is provided between adjacent outer teeth 31. In the present embodiment, the inter-external-tooth groove 32 has a shape obtained by cutting the outer peripheral surface of the external gear 30 into semicircular shapes at equal intervals when viewed in the axial direction. The external teeth 31 are portions at phase positions that are not cut when viewed in the axial direction. The external teeth 31 and the external inter-tooth grooves 32 are alternately arranged in the circumferential direction around the eccentric shaft D.

As shown in fig. 1 and 2, each of the two external gears 30 has a plurality of (eight in the example of fig. 2) through holes 33. Each through hole 33 penetrates the external gear 30 in the axial direction. The plurality of through holes 33 are arranged at equal intervals in the circumferential direction around the eccentric shaft D.

The frame 50 is a cylindrical member surrounding the radially outer sides of the two external gears 30. The frame 50 is disposed coaxially with the central axis C. As shown in fig. 2, the inner peripheral portion of the frame 50 is provided with a groove portion 51. In the present embodiment, the groove portion 51 is an arc having a center point on a virtual circle centered on the central axis C when viewed in the axial direction. Each groove portion 51 extends in the axial direction in the inner peripheral surface of the frame 50. The groove 51 holds an internal gear pin 60, which will be described later, as an internal gear. The groove portions 51 are provided at equal intervals on the inner peripheral portion of the frame 50 as viewed in the axial direction. The inner portion of the frame 50 is formed with an inter-spline 59 between adjacent groove portions 51. The groove portions 51 and the inner spline portions 59 are alternately arranged in the circumferential direction around the center axis C.

The inner pin 60 is a cylindrical member. The inner gear pin 60 is held on the inner peripheral portion of the frame 50 in a posture parallel to the axial direction. Specifically, the internal gear pin 60 is rotatably held in the groove 51 of the frame 50. Further, the end of the internal gear pin 60 is held by a drop-off prevention member 69 fixed to the frame 50. Thereby, the internal gear pin 60 cannot be disengaged from the groove portion 51. As shown in fig. 2, the internal gear pins 60 held in the groove portions 51 protrude radially inward from the inner peripheral surface of the frame 50.

A part of the plurality of external teeth of the external gear 30 and a part of the plurality of internal-tooth pins 60 held by the frame 50 are engaged with each other. Specifically, the internal gear pin 60 held in a part of the frame 50 is fitted in the external inter-tooth groove 32 of a part of the external gear 30.

When the second rotating unit 10 rotates about the central axis C, the external gear 30 revolves about the central axis C together with the eccentric shaft D. At this time, the external gear 30 revolves while shifting the meshing position of the external teeth 31 of the external gear 30 and the internal teeth (internal gear pins 60) of the frame 50 in the circumferential direction. Here, the number of the internal-tooth pins 60 held by the frame 50 is slightly larger than the number of the external teeth 31 of the external-tooth gear 30. Therefore, the position of the external teeth 31 that mesh with the internal pins 60 at the same position of the frame 50 is shifted by the number-of-teeth difference every revolution of the external gear 30. Thereby, the external gear 30 rotates about the eccentric shaft D at a third rotation speed lower than the second rotation speed in a direction opposite to the rotation direction of the second rotation part 10. Accordingly, the position of the through hole 33 of the external gear 30 also rotates at the third rotational speed. When the reduction gear 1 is operated, the two externally toothed gears 30 perform rotational motions in which the revolution and the rotation are combined.

The plurality of carrier pins 70 are substantially columnar members that penetrate the two external gears 30 and extend in the axial direction. The plurality of carrier pins 70 are arranged in a ring shape around the central axis C. Each carrier pin 70 is inserted into the through holes 33 of the two external gears 30. The bushing 71 is interposed between the outer peripheral surface of the carrier pin 70 and the inner peripheral surface of the through hole 33. As shown in fig. 2, a gap (play) is present between the outer peripheral surface of the liner ring 71 and the annular inner peripheral hole of the through hole 33. Thus, when the two externally-toothed gears 30 rotate at the decelerated third rotation speed, the carrier pins 70 are pressed against the inner peripheral surfaces of the through holes 33 of the externally-toothed gear 30, and thereby also rotate at the third rotation speed around the central axis C.

Returning to fig. 1. The third rotating portion 80 includes an annular front carrier member 81 and an annular rear carrier member 82. The front carrier member 81 is disposed on one side in the axial direction with respect to the two externally toothed gears 30. The second bearing 42 is interposed between the second rotating portion 10 and the front carrier member 81. The third bearing 43 is interposed between the front carrier member 81 and the frame 50. The rear carrier member 82 is disposed on the other axial side of the two externally toothed gears 30. The fourth bearing 44 is interposed between the second rotating portion 10 and the rear carrier member 82. Also, fifth bearing 45 is interposed between rear carrier member 82 and frame 50. The second bearing 42 and the fourth bearing 44 are, for example, ball bearings. Further, the third bearing 43 and the fifth bearing 45 are, for example, angular ball bearings.

One end of each carrier pin 70 in the axial direction is fixed to the front carrier member 81. The other axial end of each carrier pin 70 is fixed to the rear carrier member 82. Therefore, when the plurality of carrier pins 70 rotate around the center axis C at the third rotation speed, the front carrier member 81 and the rear carrier member 82 also rotate around the center axis C at the third rotation speed. Further, as a fixing method for fixing the carrier pin 70 to the front carrier member 81 and the rear carrier member 82, for example, press fitting is used.

The third rotating portion 80 is connected to a member to be driven directly or via another power transmission mechanism. That is, in the present embodiment, the third rotating portion 80 serves as an output portion. With such a configuration, in the reduction gear 1 of the present embodiment, the rotation input to the first rotation portion 5 can be decelerated in two stages by the gear type reduction mechanism and the internal planetary type reduction mechanism, and the decelerated rotation can be obtained from the third rotation portion 80.

In recent years, in the reduction gear having the above-described configuration, there has been a demand for passing a large number of wires, such as wires from the reduction gear and wires from other devices, through a hollow portion of a power input shaft of the reduction gear. Therefore, it is necessary to reduce the thickness of the power input shaft and enlarge the inner diameter of the hollow portion. However, when the power input shaft is made thin, it is difficult to form a spline groove, a key groove, or the like in the outer peripheral portion of the power input shaft, and a new problem arises in that it is difficult to fix an object to be mounted such as a gear to the power input shaft so as not to be relatively rotatable, and a solution is desired.

In this regard, the speed reducer 1 of the present embodiment has a unique mounting structure 90, and the mounting structure 90 is used to realize: even in the second rotating portion (mounted shaft) 10 that is thinned, the second gear (mounting object) 91 is mounted so as not to be able to rotate relative thereto.

< 2. details of mounting structure for mounting object on mounted shaft >

The mounting structure 90 will be described in detail below with reference to fig. 3 and 4. Fig. 3 is an exploded perspective view showing the structure of the mounting structure 90. Fig. 4 is a sectional view of the mounting structure as viewed in the axial direction. The mounting structure 90 includes a second gear 91, a second rotating portion 10, a rotation stop plate 92, and a plurality of fastening members 93.

The second gear 91 is the "mounting object" of the present embodiment. The second gear 91 is annular and has a circular hole 91a in the center (axial center). The second gear 91 is made of metal. The second gear 91 has a recess 91b recessed toward one axial side on the other axial end surface. The recess 91b is provided coaxially with the circular hole 91 a. A plurality of (eight in the example of fig. 3) screw holes 91c are provided at equal intervals in the circumferential direction at a radial middle portion of the recess 91 b. An inner peripheral surface of the screw hole 91c is formed with a female screw corresponding to a male screw formed in a shaft portion of a fastening member 93 described later.

The second rotating unit 10 is a "mounted shaft" in the present embodiment. The second rotating portion 10 has a rotation stopper portion 10a on the outer peripheral surface of the axial middle portion. The rotation stopper portion 10a is non-circular when viewed in the axial direction. More specifically, the rotation stopper portion 10a of the present embodiment has the second side portion 10d in a state where the outer peripheral surface is flattened at 4 phase positions symmetrical by rotating 90 ° around the central axis C in the outer peripheral surface. Each of the second side portions 10d is linear when viewed in the axial direction. Each second side portion 10d is planar and parallel to the central axis C. The adjacent second side portions 10d are arranged perpendicular to each other. That is, the rotation stopper 10a has a shape rotationally symmetrical about the center axis C as a whole. The radial dimension of the second rotating portion 10 is smaller in the region on the other axial side than the rotation stopper portion 10a than in the radial direction of the rotation stopper portion 10 a. More precisely, the outer diameter of the second rotating portion 10 on the other axial side than the rotation stopper portion 10a is shorter than the length between the opposing first side portions 92d, which will be described later.

The rotation stop plate 92 is a plate-like member. The rotation stop plate 92 has a rotation stop hole 92a at the center of the plate surface. The rotation stop hole 92a is non-circular when viewed in the axial direction. More specifically, the rotation stop hole 92a of the present embodiment has a square shape slightly larger than an imaginary square shape formed when the four second side portions 10d are connected to each other. Specifically, the detent hole 92a has four linear first side portions 92d that are symmetrical about the center axis C by 90 °. The end portions of the adjacent first side portions 92d are connected to each other in an arc shape.

The outer peripheral surface of the whirl-stop plate 92 has a circular contour. The circle of the contour of the whirl-stop plate 92 is arranged coaxially with the whirl-stop hole 92 a. The radial dimension of the outer peripheral surface of the whirl-stop plate 92 is slightly smaller than the radial dimension of the recess 91b of the second gear 91. A plurality of (eight in the example of fig. 3) through holes 92c are provided at equal intervals in the circumferential direction at a radial middle portion of the rotation stop plate 92. The through hole 92c is provided corresponding to the screw hole 91c of the second gear 91. The rotation stop plate 92 has a shape rotationally symmetrical about the center axis C as a whole. The thickness of the rotation stop plate 92 in the axial direction is substantially the same as the depth of the recess 91b of the second gear 91 in the axial direction.

The fastening member 93 is a known bolt having a head portion and a shaft portion. That is, the head portion has a cylindrical shape, and a groove into which the tip of a screwdriver tool such as a screwdriver is inserted is formed in the other end surface in the axial direction. The shaft portion having a smaller diameter than the head portion extends in the axial direction from an end surface on one axial side of the head portion. The head portion is disposed coaxially with the shaft portion, and has a male screw formed on an outer peripheral surface of the shaft portion.

< 3. details of the method for attaching an object to be attached to an attached shaft

The mounting structures 90 composed of the above components are mounted to each other by the following mounting method. Fig. 5 is a flowchart showing the procedure of the mounting method.

Specifically, the rotation stopper 10a is formed on the outer peripheral surface of the second rotating portion 10. Specifically, the second side portion 10d is formed by cutting a part of the outer peripheral surface of the second rotating portion 10 (step S1).

Before or after step S1, the rotation preventing plate 92 is fixed coaxially with the second gear 91 (step S2). In the present embodiment, the rotation stop plate 92 is fitted in the recess 91b of the second gear 91. At this time, the screw hole 91c of the second gear 91 and the through hole 92c of the rotation stop plate 92 overlap each other. In this state, the shaft portion of the fastening member 93 is inserted into the through hole 92c and fastened to the screw hole 91 c. When assembled in this way, at least the area near the midpoint of the first edge 92d of the detent plate 92 is located radially inward of the inner circumferential surface of the circular hole 91 a.

After the steps S1 and S2, the second gear 91 with the rotation preventing plate 92 fixed thereto is fitted into the end portion of the second rotating portion 10 on the side where the second side portion 10d is formed in the axial direction from the other side in the axial direction (step S3). At this time, the second gear 91 and the rotation stop plate 92 are fitted into the second rotating portion 10 in a state where the phase position of the first side portion 92d is aligned with the phase position of the second side portion 10d and the circular hole 91a of the second gear 91 is expanded by heating the inner circumference of the circular hole 91 a. In this way, the second rotating portion 10, the second gear 91, and the rotation stop plate 92 are fixed so as not to be relatively rotatable by both the shrink fit and the physical interaction (interference) between the first side portion 92d and the second side portion 10 d.

As described above, in the mounting structure 90 of the present embodiment, the second gear 91 is fitted into the second rotating portion 10 in a state where the rotation preventing plate 92 is fixed to the second gear 91 coaxially and the phase position of the first side portion 92d matches the phase position of the second side portion 10 d. Thus, the physical interaction (interference) between the first side portion 92d and the second side portion 10d can suppress the second gear 91 from rotating in the circumferential direction with respect to the second rotating portion 10. Therefore, the second gear 91 can be attached to the second rotating portion 10 so as not to be relatively rotatable, and it is not necessary to provide the second rotating portion 10 with a conventional key groove or spline groove. As a result, the second rotating portion 10 can be made thin, the inner diameter of the hollow portion of the second rotating portion 10 can be made large, and a large number of wires can be passed through the hollow portion.

In the mounting structure 90 of the present embodiment, the rotation stop hole 92a includes a plurality of first edge portions 92d at equal intervals in the circumferential direction. The rotation stopper 10a has a plurality of second side portions 10d at equal intervals in the circumferential direction. This makes the center of gravity of the rotation preventing plate 92 and the second rotating portion 10 well balanced. Therefore, rattling when the second rotating portion 10 to which the second gear 91 and the rotation stop plate 92 are attached is rotated is suppressed.

The detent hole 92a and the detent portion 10a of the present embodiment are rotationally symmetrical. This facilitates manufacture of the rotation preventing plate 92 and the second rotating portion 10.

In the mounting structure 90 of the present embodiment, at least a portion of the first side portion 92d is disposed radially inward of the circular hole 91a of the second gear 91 when viewed in the axial direction. This enables the first side portion 92d and the second side portion 10d to physically interact with each other.

In the mounting structure 90 of the present embodiment, the second gear 91 has a recess 91b, and the rotation stop plate 92 is fitted into the recess 91 b. This can make the axial dimension of the mounting structure 90 compact.

The second rotating portion 10 to which the shaft is attached according to the present embodiment is a power input shaft of an internal planetary reduction mechanism of the reduction gear 1. This makes it possible to reduce the thickness of the power input shaft of the speed reducer 1, and to allow a large amount of wiring to pass through the inside. As a result, the degree of freedom in arranging the wiring around the speed reducer 1 is increased.

In the mounting structure 90 of the present embodiment, the second gear 91 as the mounting object is a gear (gear). This can suppress the gear from rotating in a slipping manner with respect to the mounted shaft (second rotating unit 10) due to an overload or the like, and can operate the gear with high accuracy.

Further, in the mounting structure 90 of the present embodiment, the second gear 91 is fitted to the radially outer side of the second rotating portion 10 by shrink fitting. Thus, the second gear 91 can be prevented from rotating in the circumferential direction relative to the second rotating portion 10 by multiple times of shrink fitting and interaction between the rotation stop plate 92 and the rotation stop portion 10 a. Therefore, even when an overload is applied, the second gear 91 and the second rotating portion 10 can be rotated at the same rotation speed with high accuracy.

< 4. other modifications

In the above embodiment, the rotation preventing hole 92a has a plurality of first sides 92d, and the rotation preventing portion 10a has a plurality of second sides 10 d. However, the present invention is not limited to this, and instead of this, for example, the detent hole may have only one first side portion, and the detent portion may have only one second side portion. Alternatively, the rotation stop hole may have five or more first side portions, or the rotation stop portion may have 5 or more second side portions.

In the above embodiment, the detent hole 92a and the detent portion 10a have a rotationally symmetrical shape. However, the present invention is not limited to this, and the detent hole or the detent portion may have a non-rotationally symmetrical shape instead of the above.

In the above embodiment, the rotation stop plate 92 is fixed to the second gear 91 by using the fastening member 93, but the present invention is not limited thereto. For example, the rotation preventing plate may be fixed to the mounting object by other methods such as welding.

In the above embodiment, the second rotating portion 10 as the mounted shaft is the power input shaft of the reduction mechanism, but the present invention can be widely applied to other mounted shafts. For example, the present invention can be applied to a case where a gear is attached to a power output shaft of a motor so that the power output shaft is an "attached shaft".

In addition, the respective elements appearing in the above embodiment and the modified examples may be appropriately combined within a range in which no contradiction occurs.

The present application can be applied to, for example, a mounting structure and a mounting method.

Claims (9)

1. An installation structure, comprising:

an object to be mounted having a circular hole in the center;

a cylindrical mounted shaft having a rotation stopper portion on an outer circumferential surface thereof, the rotation stopper portion being non-circular when viewed in an axial direction; and

a plate-shaped rotation stopping plate having a rotation stopping hole of a non-perfect circle shape at a central portion thereof,

it is characterized in that the preparation method is characterized in that,

the rotation stopping hole has at least one linear first edge portion,

the rotation stopper has at least one linear second side portion,

the rotation stopper is fixed to the mounting object coaxially with the mounting object, and the mounting object is fitted to the outer side in the radial direction of the mounted shaft in a state where the phase position of the first side portion and the phase position of the second side portion coincide with each other.

2. The mounting configuration of claim 1,

the rotation stopping hole is provided with a plurality of first edge parts,

the rotation stopper has a plurality of second side portions.

3. The mounting configuration of claim 2,

a plurality of the first side portions are provided at equal intervals in the circumferential direction,

the plurality of second side portions are provided at equal intervals in the circumferential direction.

4. The mounting configuration of claim 3,

the rotation stopping holes are in a rotationally symmetrical shape,

the rotation stopping part is in a rotationally symmetrical shape.

5. The mounting structure according to any one of claims 1 to 4,

at least a part of the first side portion is disposed radially inward of the circular hole of the object to be attached, when viewed in the axial direction.

6. The mounting structure according to any one of claims 1 to 4,

the object to be mounted has a recess recessed in the axial direction on one end surface,

the rotation preventing plate is attached to the attachment object in a state of being fitted into the recess.

7. The mounting structure according to any one of claims 1 to 4,

the mounted shaft is a power input shaft of the speed reducer.

8. The mounting structure according to any one of claims 1 to 4,

the object to be attached is a gear.

9. The mounting structure according to any one of claims 1 to 4,

the mounting object is fitted to the radially outer side of the mounted shaft by shrink fitting.

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