JP2020200913A - Support part structure of transmission gear, speed reducer, and rotary device - Google Patents

Abstract

To provide a support part structure of a transmission gear which can inhibit generation of noise when power is transmitted, and to provide a speed reducer and a rotary device.SOLUTION: A support part structure of a transmission gear comprises a transmission gear 40, a support block, bearings 42A, 42B, and a displacement restriction part. The transmission gear 40 includes: a shaft part 40a which may rotate around an axis; a first gear part 40b which is formed at the shaft part 40a and engages with an input gear 33; and a second gear part 40c which is formed at a position spaced apart from the first gear part 40b of the shaft part 40a in an axial direction and engages with an output gear. The support block supports the transmission gear 40. The bearings 42A, 42B enable the support block to rotatably support the transmission gear 40. The displacement restriction part restricts axial displacement of the transmission gear 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transmission gear support structure, a speed reducer, and a rotating device.

In rotating equipment such as industrial robots and machine tools, a speed reducer is used to reduce the rotation of the rotation drive source (see, for example, Patent Document 1).

The speed reducer used here includes a main deceleration unit that decelerates the rotation on the input side and transmits it to the output side, and a gear mechanism on the front stage side that decelerates the rotation of the rotation drive source and transmits it to the main deceleration unit. ing.

The gear mechanism on the front stage side includes an input gear to which the rotation of the rotation drive source is input, an output gear for transmitting the rotation to the main reduction unit, and a transmission gear for transmitting the rotation of the input gear to the output gear. ..
When the input gear and the output gear are arranged in parallel in the reduction gear, the first gear part that meshes with the input gear and the second gear part that meshes with the output gear are integrated into two positions separated in the axial direction of the shaft part. Transmission gears formed in may be used. In this case, the shaft portion of the transmission gear is supported by a bearing such as a deep ball bearing on a support block such as a speed reducer case.

Japanese Unexamined Patent Publication No. 2004-293640

However, in the above-mentioned transmission gear support portion structure, there may be rotational torque input / output portions (first gear portion and second gear portion) at two positions separated from each other in the axial direction of the transmission gear shaft portion, and the power is supplied. Forces in various directions are applied to the shaft of the transmission gear during transmission, and the transmission gear may be slightly displaced in the axial direction. If the transmission gear is displaced in the axial direction during power transmission, noise may be generated at the meshing portion with the input gear or the output gear.

The present invention provides a transmission gear support structure, a speed reducer, and a rotating device capable of suppressing the generation of noise during power transmission.

The transmission gear support portion structure according to one aspect of the present invention includes a shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and the first gear portion of the shaft portion. A transmission gear having a second gear portion that is formed at a position axially separated from the portion and meshes with the output gear, a support block that supports the transmission gear, and a bearing that rotatably supports the transmission gear on the support block. A displacement regulating unit that regulates the axial displacement of the transmission gear is provided.

With the above configuration, the axial displacement of the transmission gear during power transmission is regulated by the displacement regulating unit. As a result, the generation of noise due to the axial displacement of the transmission gear is suppressed.

The shaft portion, the first gear portion, and the second gear portion may be integrally formed.
In this case, the dimensional accuracy of the transmission gear is improved, and the complicated assembly process of parts can be reduced.

The displacement regulating portion may be composed of an intervening member interposed between the axial end surface of the outer ring of the bearing and the support block.
In this case, the preload applied to the outer ring of the bearing can be adjusted by setting the thickness of the interposition member.

The bearing may be composed of an angular bearing.
In this case, by setting the thickness of the interposing member, preload in the axial direction and the radial direction can be applied to the bearing. Therefore, by adopting this configuration, it is possible to regulate the displacement in the axial direction and the radial direction of the transmission gear and further suppress the fluttering of the transmission gear during power transmission.

The inner ring of the bearing may be integrally formed with the shaft portion of the transmission gear.
In this case, the bearing assembly error can be reduced as compared with the case where the internal teeth are formed separately from the shaft portion of the transmission gear and the internal teeth are assembled to the shaft portion. As a result, the transmission gear can be assembled more accurately by the support block.

The bearings may be arranged on one end side and the other end side of the shaft portion in the axial direction.
In this case, the transmission gear can be supported more stably with respect to the support block.

The transmission gear support portion structure according to one aspect of the present invention includes a shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and the first gear portion of the shaft portion. A transmission gear having a second gear portion that is formed at a position separated from the portion in the axial direction and meshes with the output gear, a support block that supports the transmission gear, and the transmission gear on one end side of the shaft portion in the axial direction. A pair of gears that rotatably support the support block on the other end side, each of which is composed of an angular gear, is between the axial end face of the outer ring of one of the bearings and the support block. Is provided with a displacement regulating unit that regulates the axial displacement of the transmission gear.

The speed reducer according to one aspect of the present invention includes a shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with an input gear, and the first gear portion and the axial direction of the shaft portion. A transmission gear having a second gear portion that is formed at a position separated from the output gear and meshes with the output gear, a support block that supports the transmission gear, a bearing that rotatably supports the transmission gear on the support block, and the transmission gear. It is equipped with a displacement control unit that regulates the axial displacement of the gear.

The rotating device according to one aspect of the present invention includes a speed reducer to which power is input from a rotary drive source and a rotated body connected to an output portion of the speed reducer, and the speed reducer is provided with a rotation around the axis. A rotatable shaft portion, a first gear portion formed on the shaft portion and meshing with the input gear, and a second gear portion formed on the shaft portion at a position axially separated from the first gear portion and meshing with the output gear. A transmission gear having a portion, a plurality of bearings for rotatably supporting the shaft portion of the transmission gear to a non-rotating fixed block of the speed reducer and the rotating body, and one of the rotating body and the bearing. A displacement regulating unit, which is interposed between the two and regulates the axial displacement of the transmission gear, is provided.
In this case, with a simple configuration in which the shaft portion of the transmission gear is sandwiched between the fixed block of the reduction gear and the rotating body, the transmission gear is regulated to be displaced in the axial direction, and the fixed block of the reduction gear and the rotating body It can be rotatably supported.

Since the above-mentioned transmission gear support portion structure can regulate the axial displacement of the transmission gear by the displacement regulating portion, it is possible to suppress the generation of noise due to the axial displacement of the transmission gear.

A partial cross-sectional front view of the rotating device of the embodiment. An enlarged cross-sectional view of a part of the rotating device of the embodiment. FIG. 3 is an enlarged view of part III of FIG. 1 of the rotating device of the embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial cross-sectional front view of the rotating device 1 of the present embodiment, and FIG. 2 is an enlarged cross-sectional view of a part of the rotating device 1 (a part of the speed reducer 10).
The rotating device 1 is, for example, a rotating moving device used in a manufacturing line of a factory or the like. The rotating device 1 includes a rotational drive source such as an electric motor (not shown), a speed reducer 10 that reduces the rotation of the rotary drive source, and a rotating body 11 such as a turntable that is rotated by the rotation decelerated by the speed reducer 10. And have.

The speed reducer 10 includes a base block 12 whose lower end is fixed on the installation surface of the equipment used, a first carrier block 13A and a second carrier block 13B integrally fixed to the base block 12, and a first carrier block 13A. A substantially cylindrical outer cylinder 17 rotatably supported on the outer peripheral side of the second carrier block 13B via a bearing 14, and a plurality of rotatably supported outer cylinders 13A and the second carrier block 13B. A crankshaft 18 and a first swivel gear 19A and a second swivel gear 19B that swivel together with two eccentric portions 18a and 18b of each crankshaft 18 are provided.

The first carrier block 13A has a perforated disc-shaped substrate portion 13Aa and a plurality of support columns (not shown) extending from the end surface of the substrate portion 13Aa toward the second carrier block 13B. The second carrier block 13B is formed in the shape of a perforated disk having substantially the same outer diameter as the substrate portion 13Aa of the first carrier block 13A. In the first carrier block 13A, a plurality of strut portions are overlapped on the end surface of the second carrier block 13B, and the strut portions are integrally connected to the second carrier block 13B by bolting. The second carrier block 13B is stacked on the base block 12 and fastened and fixed to the base block 12 by bolts 15. An axial gap is secured between the substrate portion 13Aa of the first carrier block 13A and the second carrier block 13B. A first swivel gear 19A and a second swivel gear 19B are arranged in this gap.
The first swivel gear 19A and the second swivel gear 19B are formed with escape holes (not shown) through which each strut portion of the first carrier block 13A penetrates. The relief hole is formed to have a sufficiently large inner diameter with respect to the strut portion so that each strut portion does not interfere with the swivel operation of the first swivel gear 19A and the second swivel gear 19B.

The outer cylinder 17 is arranged so as to straddle the outer peripheral surface of the substrate portion 13Aa of the first carrier block 13A and the outer peripheral surface of the second carrier block 13B. Both ends of the outer cylinder 17 in the axial direction are rotatably supported by the substrate portion 13Aa of the first carrier block 13A and the second carrier block 13B via bearings 14. Further, as shown in FIG. 2, the output of the speed reducer 10 is output on the inner peripheral surface of the central region of the outer cylinder 17 in the axial direction (the region facing the outer peripheral surfaces of the first swivel gear 19A and the second swivel gear 19B). A plurality of pin grooves 16 extending in parallel with the rotation center axis c1 on the side are formed. The plurality of pin grooves 16 are formed on the inner peripheral surface of the outer cylinder 17 at equal intervals in the circumferential direction. A columnar internal tooth pin 20 is rotatably housed in each pin groove 16.

The first swivel gear 19A and the second swivel gear 19B are formed to have an outer diameter slightly smaller than the inner diameter of the outer cylinder 17. External teeth 19Aa and 19Ba that are in mesh with a plurality of internal tooth pins 20 arranged in the pin grooves 16 of the outer cylinder 17 are formed on the outer peripheral surfaces of the first swivel gear 19A and the second swivel gear 19B. ing. The number of external teeth 19Aa and 19Ba of the first swivel gear 19A and the second swivel gear 19B is set to be slightly smaller (for example, one less) than the number of internal tooth pins 20 (the number of pin grooves 16). ing.

The plurality of crankshafts 18 are arranged on the same circumference centered on the rotation center axis c1 of the first carrier block 13A and the second carrier block 13B. Each crankshaft 18 is rotatably supported by a first carrier block 13A and a second carrier block 13B via a bearing 22. The eccentric portions 18a and 18b of each crankshaft 18 penetrate the first swing gear 19A and the second swing gear, respectively. The eccentric portions 18a and 18b are rotatably engaged with the support holes 21 formed in the first swing gear 19A and the second swing gear 19B via the eccentric bearing 23. The two eccentric portions 18a and 18b of each crankshaft 18 are eccentric so that their phases are 180 ° out of phase with each other around the axis of the crankshaft 18.

When a plurality of crankshafts 18 receive an external force and rotate in one direction, the eccentric portions 18a and 18b of the crankshafts 18 turn in the same direction with a predetermined radius, and accordingly, the first turning gear 19A and the second turning gear 19B Turns in the same direction with the same turning radius. At this time, the outer teeth 19Aa and 19Ba of the first swivel gear 19A and the second swivel gear 19B come into contact with the plurality of internal tooth pins 20 arranged in the pin grooves 16 of the outer cylinder 17 so as to mesh with each other.
In the speed reducer 10 of the present embodiment, the number of external teeth 19Aa and 19Ba of the first swivel gear 19A and the second swivel gear 19B is slightly smaller than the number of internal tooth pins 20 (the number of pin grooves 16). Since it is set, the outer cylinder 17 is pushed around in the same direction as the turning direction by a predetermined pitch while the first turning gear 19A and the second turning gear 19B make one turn. As a result, the rotation of the crankshaft 18 is greatly decelerated and output as the rotation of the outer cylinder 17. In the present embodiment, the 18 eccentric portions 18a and 18b of each crankshaft are eccentric so as to deviate from each other by 180 ° around the axis, so that the turning phases of the first turning gear 19A and the second turning gear 19B are different. It will be shifted by 180 °.

The rotating body 11 that rotates in response to the rotation of the speed reducer 10 is integrally connected to the outer cylinder 17 of the speed reducer 10 by bolting or the like. Therefore, the rotated body 11 rotates integrally with the outer cylinder 17 of the speed reducer 10. In the present embodiment, the rotated body 11 rotates substantially horizontally on the upper side of the speed reducer 10.

A cylindrical tubular portion 27 is projected upward at a substantially central portion of the base block 12. The tubular portion 27 penetrates the inner peripheral portions of the second carrier block 13B, the second swivel gear 19B, the first swivel gear 19A, and the first carrier block 13A in a non-contact state. An electric wiring or the like for supplying electric power to the rotary drive source is inserted inside the tubular portion 27.

Further, the upper portion of each crankshaft 18 penetrates the first carrier block 13A upward. A crankshaft gear 31 (output gear) for transmitting the power of the rotational drive source to each crankshaft 18 is integrally attached to the end of each crankshaft 18 protruding upward from the first carrier block 13A. ..

Further, above the peripheral edge of the outer cylinder 17, an input gear 33 connected to the output shaft of the rotary drive source is arranged. The input gear 33 is arranged above the crankshaft gear 31 so that the rotation center axis c2 faces in the vertical direction. A transmission gear 40 for transmitting the rotation of the input gear 33 to each crankshaft gear 31 (output gear) is arranged on the upper portion of the first carrier block 13A. The transmission gear 40 is arranged coaxially with the rotation center axis c1 of the output unit of the speed reducer 10.

The transmission gear 40 includes a cylindrical shaft portion 40a that can rotate around the axis, a first gear portion 40b that projects radially outward from the outer peripheral surface of the shaft portion 40a near the upper part, and a shaft portion 40a near the lower part. It has a second gear portion 40c formed on the outer peripheral surface (at a position separated from the first gear portion 40b in the axial direction). In the case of the present embodiment, the shaft portion 40a, the first gear portion 40b, and the second gear portion 40c are integrally formed. The outer diameter of the second gear portion 40c is smaller than that of the first gear portion 40b, and the number of teeth is set to be smaller than that of the first gear portion 40b. The shaft portion 40a is arranged outside the tubular portion 27 that projects upward from the central position of the first carrier block 13A. The shaft portion 40a is in a non-contact state with respect to the cylinder portion 27. The upper end portion of the shaft portion 40a is rotatably supported by the edge portion of the through hole 41 formed in the center of the lower end of the rotating body 11 via the bearing 42A. Further, the lower end portion of the shaft portion 40a is rotatably supported by the edge portion of the through hole 43 formed in the upper center of the first carrier block 13A via the bearing 42B.
In the present embodiment, the first carrier block 13A of the speed reducer 10 and the rotating body 11 form a support block that supports the transmission gear 40. Further, the first carrier block 13A constitutes a fixed block in which the speed reducer 10 does not rotate.

FIG. 3 is an enlarged view of Part III of FIG.
The bearings 42A and 42B that support the transmission gear 40 include an inner ring 42i integrated with the shaft portion 40a of the transmission gear 40, an outer ring 42o locked to the rotating body 11 and the first carrier block 13A, and the inner ring 42i and the outer ring. It includes a rolling element 42r that rolls between 42o. Each of the bearings 42A and 42B is composed of angular contact ball bearings. However, each of the bearings 42A and 42B can adopt a bearing structure of another form such as an angular roller bearing. In each of the bearings 42A and 42B, the straight line connecting the contact point between the outer ring 42o and the rolling element 42r (ball) and the contact point between the inner ring 42i and the rolling element 42r (ball) has a contact angle, and acts on the transmission gear 40 in the radial direction. And the load in the axial direction. The two bearings 42A and 42B receive the axial load in the opposite directions.
The inner ring 42i of each of the bearings 42A and 42B is integrally formed on the outer periphery of both end portions of the shaft portion 40a of the transmission gear 40. However, the inner ring 42i of each of the bearings 42A and 42B can be formed separately from the shaft portion 40a of the transmission gear 40, and can be fitted and fixed to the outer periphery of the end portion of the shaft portion 40a of the transmission gear 40 later.

A stepped annular groove 44 is formed at the upper end of the through hole 43 of the first carrier block 13A. The outer ring 42o of the bearing 42B on the lower side is fitted into the annular groove 44. At this time, the axial end surface of the outer ring 42o comes into contact with the flat lower wall 44a of the fitting groove 44.

Further, an annular groove 45 is formed in a stepped shape at the lower end of the through hole 41 of the rotating body 11. The annular groove 45 is fitted to the outer ring 42o of the bearing 42A on the upper side of the transmission gear 40 when the rotating body 11 is assembled to the speed reducer 10 by bolting or the like. At this time, a shim 46 having a predetermined thickness, which is an interposing member, is interposed between the axial end surface of the outer ring 42o and the flat upper wall 45a of the annular groove 45. When the rotating body 11 is assembled to the speed reducer 10, the shim 46 presses the outer ring 42o of the bearing 42A on the upper side inward in the axial direction (lower in the drawing). The load acting on the outer ring 42o of the upper bearing 42A from the shim 46 is also transmitted to the lower bearing 42B through the shaft portion 40a of the transmission gear 40 which also serves as the inner ring 42i of the upper and lower bearings 42A and 42B. Since the upper and lower bearings 42A and 42B of the present embodiment are angular contact ball bearings (angular bearings), preload in the axial direction and the radial direction is applied by pressing the outer ring 42o by the shim 46.
In this embodiment, the shim 46 constitutes a displacement regulating unit that regulates the axial displacement of the transmission gear 40.

As described above, in the rotating device 1 of the present embodiment, the transmission gear 40 that transmits rotation from the input gear 33 to the output gear (crankshaft gear 31) presses the displacement regulating portion (outer ring 42o of the bearing 42A in the axial direction). The axial displacement is regulated by the shim 46). Therefore, in the support structure of the transmission gear 40 adopted in the present embodiment, the transmission gear 40 is displaced in the axial direction when the speed reducer 10 is operated, and the transmission gear 40 is located between the transmission gear 40 and the input gear 33 or the transmission gear 40. It is possible to suppress a problem of generating noise between the output gear and the output gear (crankshaft gear 31).

Further, in the support portion structure of the transmission gear 40 adopted in the present embodiment, the shaft portion 40a, the first gear portion 40b, and the second gear portion 40c are integrally formed. Therefore, when this configuration is adopted, the dimensional accuracy of the transmission gear 40 is improved, and complicated parts assembling steps can be reduced.

Further, in the support portion structure of the transmission gear 40 adopted in the present embodiment, the displacement regulating portion is interposed between the axial end surface of the outer ring 42o of the bearing 42A and the support block (rotated body 11). It is composed of a bearing member (sim 46). Therefore, the preload applied to the outer rings 42o of the bearings 42A and 42B can be adjusted by appropriately setting the thickness of the shim 46, which is an interposition member. Therefore, the displacement of the transmission gear 40 in the axial direction can be reduced, and the generation of noise can be further suppressed.

In particular, in the support portion structure of the transmission gear 40 adopted in the present embodiment, since the bearings 42A and 42B holding the transmission gear 40 are composed of angular bearings, one of the bearings 42A is provided with a shim 46 which is an interposition member. By applying an axial load to the outer ring 42o, it is possible to appropriately apply a preload in the axial direction and the radial direction to the bearings 42A and 42B. Therefore, when the configuration of the present embodiment is adopted, the displacement in the axial direction and the radial direction of the transmission gear 40 can be more reliably regulated, and the fluttering of the transmission gear 40 at the time of power transmission can be further suppressed.

Further, in the support portion structure of the transmission gear 40 adopted in the present embodiment, the inner rings 42i of the bearings 42A and 42B are integrally formed with the shaft portion 40a of the transmission gear 40. Therefore, the assembly error of the bearings 42A and 42B is compared with the case where the inner ring 42i of the bearings 42A and 42B is formed separately from the transmission gear 40 and is later fitted and fixed to the shaft portion 40a of the transmission gear 40. Can be made smaller. Therefore, the transmission gear 40 can be more accurately assembled to the rotating body 11 which is the support block and the first carrier block 13A of the speed reducer 10.

Further, in the support portion structure of the transmission gear 40 adopted in the present embodiment, since the bearings 42A and 42B are arranged on one end side and the other end side in the axial direction of the shaft portion 40a of the transmission gear 40, the transmission gear 40 Can be stably supported by the support blocks (rotated body 11, first carrier block 13A).

In particular, in the present embodiment, since angular bearings are used as bearings 42A and 42B for holding one end side and the other end side of the shaft portion 40a of the transmission gear 40 in the axial direction, the shaft portion of the transmission gear 40 Axial and radial displacements can be reliably suppressed at both ends of 40a. Therefore, when this configuration is adopted, the transmission gear 40 can be supported more stably by the support block (rotated body 11, first carrier block 13A).

Further, in the rotating device 1 of the present embodiment, the shaft portion 40a of the transmission gear 40 is attached to the first carrier block 13A, which is a fixed block on the speed reducer 10 side, and the rotating body 11 attached to the outer cylinder 17 of the speed reducer 10. It is supported via bearings 42B and 42A, and a shim 46, which is a displacement regulating portion, is interposed between the upper wall 45a of the annular groove 45 of the rotated body 11 and the outer ring 42o of one bearing 42A. Therefore, when this configuration is adopted, the transmission gear 40 is provided by a simple configuration in which the shaft portion 40a of the transmission gear 40 is sandwiched between the fixed block (first carrier block 13A) of the speed reducer 10 and the rotating body 11. , The rotating device 1 can be rotatably supported in a state where the axial displacement is regulated.
Further, in the rotating device 1 of the present embodiment, when the rotating body 11 is attached to the speed reducer 10, the thickness of the shim 46 interposed between the rotating body 11 and the outer ring 42o of the bearing 42A is appropriately changed. , Transmission gear 40 rattling adjustment can be easily performed.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof.
For example, in the above embodiment, angular bearings are used as bearings 42A and 42B for supporting the transmission gear 40 on the support blocks (rotated body 11, first carrier block 13A), but the transmission gear 40 is supported by the support block. It is also possible to adopt other types of bearings such as deep ball bearings as the bearings to be supported by the bearings. Also in this case, it is desirable that the inner ring of the bearing is integrally formed with the shaft portion of the transmission gear, and the outer ring is given a preload in the axial direction by a shim or the like.

Further, in the above embodiment, the carriers (first carrier block 13A and second carrier block 13B) are fixed and the outer cylinder 17 is configured to rotate as an output rotating body, but conversely, the outer cylinder 17 is fixed. The carriers (first carrier block 13A and second carrier block 13B) may be configured to rotate as an output rotating body.

1 ... Rotating equipment, 10 ... Reducer, 11 ... Rotated body (support block), 13A ... First carrier block (support block, fixed block), 31 ... Crankshaft gear (output gear), 33 ... Input gear, 40 ... Transmission gear, 40a ... Shaft, 40b ... First gear, 40c ... Second gear, 42A, 42B ... Bearing, 42i ... Inner ring, 42o ... Outer ring, 42r ... Rolling element, 46 ... Sim (intermediate member)

Claims (9)

A shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and a shaft portion that is formed at a position axially separated from the first gear portion of the shaft portion and meshes with the output gear. A transmission gear with a second gear and
A support block that supports the transmission gear and
A bearing that rotatably supports the transmission gear on the support block,
A support portion structure of a transmission gear including a displacement regulation portion that regulates an axial displacement of the transmission gear. A support portion structure for a transmission gear in which the shaft portion, the first gear portion, and the second gear portion are integrally formed. The support portion structure for a transmission gear according to claim 1 or 2, wherein the displacement regulating portion is composed of an intervening member interposed between an axial end surface of the outer ring of the bearing and the support block. The support structure for a transmission gear according to claim 3, wherein the bearing is composed of an angular bearing. The support structure for a transmission gear according to claim 3 or 4, wherein the inner ring of the bearing is integrally formed with the shaft portion of the transmission gear. The support structure for a transmission gear according to any one of claims 1 to 5, wherein the bearing is arranged on one end side and the other end side in the axial direction of the shaft portion. A shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and a shaft portion that is formed at a position axially separated from the first gear portion and meshes with the output gear. A transmission gear with a second gear and
A support block that supports the transmission gear and
A pair of bearings that rotatably support the transmission gear on the support block on one end side and the other end side in the axial direction of the shaft portion are provided.
Each of the bearings is composed of angular bearings.
A support gear structure in which a displacement regulating portion that regulates the axial displacement of the transmission gear is arranged between the axial end surface of the outer ring of the bearing and the support block. A shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and a shaft portion that is formed at a position axially separated from the first gear portion of the shaft portion and meshes with the output gear. A transmission gear with a second gear and
A support block that supports the transmission gear and
A bearing that rotatably supports the transmission gear on the support block,
A speed reducer including a displacement regulating unit that regulates the axial displacement of the transmission gear. A reducer that receives power from a rotary drive source,
A rotating body connected to the output unit of the speed reducer is provided.
The speed reducer
A shaft portion that can rotate around the axis, a first gear portion that is formed on the shaft portion and meshes with the input gear, and a shaft portion that is formed at a position axially separated from the first gear portion of the shaft portion and meshes with the output gear. A transmission gear with a second gear and
A plurality of bearings that rotatably support the shaft portion of the transmission gear to the non-rotating fixed block of the speed reducer and the rotating body.
A rotating device including a displacement regulating unit interposed between the rotating body and one of the bearings to regulate the axial displacement of the transmission gear.

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