JP3616804B2 - Roller with built-in motor with reduction gear, and reduction gear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor built-in roller with a speed reducer, and a speed reducer that can be used for a motor built-in roller and other driving devices.
[0002]
[Prior art]
Conventionally, a motor built-in roller in which a gear motor (geared motor unit) is built in a roller body is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-79358. As a speed reducer built in the conventional motor built-in roller, a planetary gear train including a sun gear and a plurality of planetary gears has been adopted.
[0003]
[Problems to be solved by the invention]
In order to incorporate the planetary gear train, a predetermined diameter is required, and there is a limit to the reduction in diameter, and it is difficult to construct a motor-integrated roller with a small diameter.
[0004]
As a reduction gear that can be built in a small-diameter space and that can obtain a high reduction ratio, for example, swash plate gear type reduction gears disclosed in JP-A-6-241286 and JP-A-7-248047 are known. It has been. In these conventional swash plate gear type reduction gears, an inclined disk having a support surface that is inclined with respect to the input shaft is provided integrally with the input shaft, and the input side gear (swash plate gear) is supported on the support surface of the inclined disk. The input side gear is configured to swing with the rotation of the inclined disk.
[0005]
However, in such a conventional configuration, the part shape is complicated, and the support surface that supports the input side gear is an inclined surface, and the processing accuracy of the inclined surface greatly affects the functional surface. Further, when a larger reduction ratio is required, it is necessary to provide a plurality of reduction gears, and a large built-in space is required.
[0006]
SUMMARY OF THE INVENTION Accordingly, the present invention provides a speed reducer that can achieve a large reduction ratio while achieving a small diameter and a small size, can easily process parts, and can reduce costs, and a roller with a built-in motor having the speed reducer. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means.
[0008]
That is, according to the present invention, a motor and a speed reducer are incorporated in a roller body that is rotatably supported with respect to a fixed shaft, and the rotational force of the motor is decelerated by the speed reducer and transmitted to the roller body, so that the roller body is fixed. In the motor built-in roller that is driven to rotate with respect to the shaft, the speed reducer is disposed so as to be opposed to the disk-shaped input member that is rotationally driven by the rotational force of the motor in the axial direction and is prevented from rotating. An input side gear and an output side gear that is axially opposed to the input side gear and coupled to the roller body, and the input side gear and the output side gear have a predetermined difference in the number of teeth. A plurality of balls having different diameters are disposed between the input member and the input side gear, the plurality of balls being in rolling contact with both the input member and the input side gear, Win the ball As a result, the input side gear is inclined with respect to the output side gear, and these gears are meshed in part in the circumferential direction, and the input side gear swings according to the circumferential movement of a plurality of balls as the input member rotates. The meshing portion of the input side gear and the output side gear is shifted in the circumferential direction.
[0009]
According to the roller with a built-in motor of the present invention, a so-called swash plate gear type reduction gear is used to achieve a high reduction ratio and downsizing, while the input side gear functioning as a swash plate gear swings a large and small ball. Therefore, the surface facing the input side gear of the input member (the swash plate facing surface) can be a plane orthogonal to the axial direction, and a plurality of large and small balls can be brought into rolling contact with the facing surface. Since it is good, it becomes easy to manufacture and process parts, and cost can be reduced. In particular, if a plurality of balls are brought into rolling contact with the input member, a reduction ratio of 1/2 can be obtained when converting the rotational force of the input member into the swinging force of the input side gear, and even in a small-diameter space. It is possible to obtain a large reduction ratio without providing a plurality of speed reducers.
[0010]
In the motor built-in roller with a reduction gear according to the present invention, the motor, the input member, the input side gear, and the output side gear are arranged in series in the axial direction in the cylindrical housing to constitute a gear motor. The output shaft projecting outward from the axial end of the cylindrical housing is linked and connected, the gear motor is built in the roller body, and the output shaft is linked and connected to the roller body. Can do.
[0011]
According to such a configuration, a production line for a predetermined gear motor that incorporates the swing gear type reduction gear having the above-described novel structure is provided, and the gear motor produced by the line is incorporated into a roller body having a desired diameter. Since the built-in roller can be manufactured and the gear motor can be shared among the plurality of built-in motors having a plurality of diameters, it is possible to facilitate parts management and reduce costs.
[0012]
Further, the motor built-in roller with a reduction gear according to the present invention may further include a retainer that holds the mutual positional relationship of the plurality of balls, so that even if the plurality of balls are not held by the input member. It is possible to prevent the positional relationship between the plurality of balls from deviating. The retainer can be rotatable relative to the input member and the input side gear. That is, the retainer may be pivotally supported on the input member, the gear motor housing, or the like, or may not have the retainer support shaft. Further, if the plurality of balls are brought into rolling contact with both the input member and the input side gear, the moving speed in the circumferential direction of the plurality of balls with respect to the rotational speed of the input member is halved, and at this portion, ½ A reduction ratio can be obtained, and it is possible to obtain a reduction ratio that is about twice as large as that of a conventional swash plate gear type reduction gear.
[0013]
The present invention also includes a disk-shaped input member that is rotationally driven by the rotational force of a drive source, an input side gear that is disposed to face the input member in the axial direction and is prevented from rotating, and the input side An output-side gear disposed opposite to the gear in the axial direction, the input-side gear and the output-side gear have a predetermined tooth number difference, and the input member and the input-side gear have a plurality of different diameters. The balls are in rolling contact with both the input member and the input side gear, and the input side gear is in contact with the plurality of balls so that the input side gear is in contact with the output side gear. These gears are inclined and meshed in part in the circumferential direction, and the input side gears oscillate according to the circumferential movement of the plurality of balls as the input member rotates, and the input side gear and the output side gear mesh. Also characterized by the part moving in the circumferential direction It is.
[0014]
The speed reducer according to the present invention includes a retainer that maintains a mutual positional relationship between a plurality of balls, the retainer is rotatable relative to the input member and the input side gear, and the plurality of balls are connected to the input member and the input. It is possible to make rolling contact with both side gears.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
1 to 5 show a roller with a built-in motor 1 and its components according to an embodiment of the present invention. The roller with a built-in motor 1 has a roller body 2 and a motor 3 and a speed reducer 4 that are cylindrical. A gear motor 6 (also referred to as a geared motor unit) incorporated in the housing 5 is incorporated, and has a double cylinder structure composed of the roller body 2 and the cylindrical housing 5.
[0017]
As shown in FIG. 2, the roller body 2 is a cylindrical member, and fixed shafts 7 and 8 protrude from both ends. The fixed shafts 7 and 8 both communicate with the inside and outside of the roller body 2, and support the roller body 2 with respect to the fixed shafts 7 and 8 via bearings 10 and 11, respectively. The gear motor 6 is fixed to one fixed shaft 7. This fixing structure can be made as appropriate, but preferably the vibration generated in the gear motor 6 by fixing the end of the housing 5 to the fixed shaft 7 via a buffer member made of rubber or resin. It is preferable that noise and noise are not transmitted to the fixed shaft 7.
[0018]
The housing 5 of the gear motor 6 is a cylindrical body having an outer diameter that does not contact the inner peripheral surface of the roller body 2. The housing 5 is inserted into the roller body 2 in a suspended manner, and a motor 3 and a speed reducer 4 are unitized and housed therein as shown in FIG.
[0019]
The motor 3 can be of any appropriate configuration, for example, it can be mainly composed of a stator and a rotor as well as a known motor built-in roller, preferably a brushless DC motor. The motor 3 includes an output shaft 12 that protrudes in the axial direction from the end of the housing 5, and the output shaft 12 is connected to the rotor of the motor 3, and the rotational force of the motor 3 is transmitted.
[0020]
As shown in FIG. 1, the speed reducer 4 includes a disk-shaped input plate 13, an input side gear 14 that is disposed so as to face the input plate 13 in the axial direction and functions as a swash plate gear, and the input side An output side gear 15 that is disposed opposite to the gear 14 in the axial direction, and a plurality of balls 16 a and 16 b interposed between the input plate 13 and the input side gear 14 are provided.
[0021]
The input plate 13 is integrally provided with a disk portion 13a and a boss portion 13b. The boss portion 13b is rotatably supported with respect to the housing 5 via a bearing 17, and the output shaft 12 of the motor 3 is connected to the boss portion 13b. The rotational force of the motor 3 is transmitted to the input plate 13 via the output shaft 12. The surface of the input plate 13 facing the input side gear 14, that is, the outer surface of the disk portion 13 a is formed in a planar shape orthogonal to the axis of the output shaft 12.
[0022]
In addition, you may form a recessed part and a convex part in the contact part of the some ball | bowl 16a, 16b. That is, when the balls 16a and 16b are in rolling contact with the input plate 13 as in the illustrated example, a concave groove extending along the track may be formed on the surface of the input plate 13 facing the input side gear 14. In addition, when the balls 16a and 16b are rotatably held on the input plate 13, a spherical concave portion can be formed in the holding portion.
[0023]
The input side gear 14 (swash plate gear) has substantially the same diameter as the disk portion 13a of the input plate 13, and moves in the housing 5 in the axial direction or swings about a predetermined position on the shaft center as a swing center. Is allowed, but rotation is prevented. In the illustrated example, as shown in FIG. 1 and FIG. 5, a protrusion 18 projecting radially inward is provided at a predetermined circumferential position on the inner peripheral surface of the housing 5, while the outer peripheral portion of the input side gear 14 is A guide groove 19 extending in the axial direction is provided at a position corresponding to the protrusion 18, and the protrusion 18 is engaged with the guide groove 19. In the illustrated example, the protrusion 18 and the guide groove 19 are provided at four locations in the circumferential direction, respectively. It is also possible to provide a protrusion on the input side gear 14 and a guide groove on the housing 5 side. In addition, the input-side gear 14 can be swingably held by an appropriate structure.
[0024]
Between the input plate 13 and the input side gear 14, one large-diameter ball 16a and two small-diameter balls 16b are arranged. The plurality of balls 16a and 16b are rotatably held by a disk-shaped retainer 20, and the mutual positional relationship between the balls is held. Each ball 16a, 16b protrudes from both the front surface and the back surface of the retainer 20, and the balls 16a, 16b are in rolling contact with the opposing surfaces of the input plate 13 and the input side gear 14, but the retainer 20 is in contact with them. I'm not going to do that. The retainer 20 is rotatable relative to the input plate 13, the input side gear 14, and the housing 5. In the illustrated example, the retainer 20 is held by the balls 16a and 16b. However, a support shaft that rotatably holds the retainer 20 may be provided on the input plate 13. An appropriate support member may be provided between the retainer 20 and the retainer 20.
[0025]
With this configuration, the input side gear 14 swings so that the inclination direction changes in the circumferential direction as the input plate 13 rotates, while the input side gear 14 rotates due to the engagement between the protrusion 18 and the guide groove 19. Is blocked. The retainer 20 rotates in synchronization with the circumferential movement of the balls 16a and 16b. Since the balls 16a and 16b are in rolling contact with both the input plate 13 and the input side gear 14, when the input plate 13 makes one rotation, the balls 16a and 16b roll in the circumferential direction by 1/2 rotation. It becomes possible to obtain a reduction ratio of ½ in stages.
[0026]
The material of the balls 16a and 16b can be appropriate, and may be, for example, metal, hard resin, hard rubber, or the like. Further, the balls 16a and 16b are not limited to perfect spheres, and the cross-sectional shape in the other direction may be a flat shape as long as it is a perfect circle in the rolling direction (that is, the circumferential direction). Further, the surface of the input plate 13 and / or the input side gear 14 where the balls 16a and 16b are contacted can be subjected to appropriate surface processing or surface treatment for increasing the frictional resistance, for example, a rubber sheet is pasted. Is possible.
[0027]
The output side gear 15 has substantially the same diameter as the input side gear 14 and is disposed concentrically with the input plate 13, and is disposed opposite to the input side gear 14 in the axial direction on the side opposite to the input plate 13. ing. On the outer peripheral portions of the input side gear 14 and the output side gear 15, tooth portions 14 a and 15 a that mesh with each other are provided to face each other. The shape of the tooth portions 14a and 15a can be an appropriate shape such as a trochoidal curve. As shown in FIG. 4, the input side gear 14 is swingably supported by the output side gear 15 via a swing support ball 21 disposed at the center of the shaft. Further, the provision of the ball 21 prevents the input side gear 14 and the output side gear 15 from meshing over the entire circumference, and a part of the circumferential direction of the input side gear 14 is on the output side. When meshing with the gear 15, as shown in the figure, the tooth portions 14a, 15a of both gears are completely separated from each other on the opposite side of the meshing portion.
[0028]
The input side gear 14 is inclined with respect to the output side gear 15 by being in contact with and supported by a plurality of large and small balls 16a and 16b, and these gears mesh with each other in a part in the circumferential direction. Therefore, when the input plate 13 is rotated by the rotational force of the motor 3, the plurality of balls 16a and 16b move in the circumferential direction at half the speed as described above, and the input side gear 14 supported by the balls in accordance with this movement. Oscillates so that the meshing portion of the input side gear 14 and the output side gear 15 shifts in the circumferential direction.
[0029]
The input side gear 14 and the output side gear 15 have a predetermined difference in the number of teeth. The difference in the number of teeth may be 1 or 2 or more. Further, the number of teeth of the input side gear 14 may be larger or smaller than the number of teeth of the output side gear 15. By providing such a difference in the number of teeth, when the input side gear 14 swings one turn while shifting the meshing portion with the output side gear 15 in the circumferential direction, the rotation of the input side gear 14 is prevented. Therefore, the output side gear 15 rotates by the difference in the number of teeth. When viewed from the output shaft 12 of the motor 3, when the output shaft 12 rotates twice, the input side gear 14 swings by one cycle, and the output side gear 15 rotates by the difference in the number of teeth.
[0030]
In order to ensure meshing of the gears 14 and 15 in a part of the circumferential direction and rolling contact of the balls 16a and 16b with the input plate 13 and the input side gear 14, the output side gear 15 is changed to the input side gear 14. In addition, biasing means 22 for biasing in the axial direction toward the input plate 13 is provided. The urging means 22 is composed of a ring-shaped spring plate having a corrugated cross section provided on the back side of the output side gear 15 (the side opposite to the input side gear 14). A cylindrical cap 23 is attached to the end of the housing 5, and the urging means 22 is disposed between the cap 23 and the output side gear 15.
[0031]
An output shaft 24 is concentrically connected to the output side gear 15 by spline coupling. The output shaft 24 protrudes outward in the axial direction from the cap 23 at the end of the housing 5 and is rotatably supported by the cap 23 via a bearing 25.
[0032]
A cylindrical connecting member 26 is fixed to the output shaft 24 as shown in FIG. 2, and the connecting member 26 is fixed to the roller body 2 by fixing means such as a fixing pin 27. The roller body 2 is driven to rotate in conjunction with the output side gear 15.
[0033]
According to the speed reducer 4 according to the present embodiment, when the rotational force of the motor 3 that is a driving source is converted into the swinging force of the input side gear 14, the speed is reduced to 1/2, and the swinging force of the input side gear 14 is reduced. Is converted to the rotational force of the output side gear 15, a reduction ratio of (the number of teeth of both gears / the number of teeth of the input side gear) is obtained, so that compared with the conventional swash plate gear type reduction mechanism The reduction ratio can be doubled, and this large reduction ratio is obtained with a simple configuration and a small number of parts. Therefore, the cost can be reduced, and a small-diameter geared motor unit with a large reduction ratio can be obtained. It can be easily configured.
[0034]
The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, each of the gears 14 and 15 can be constituted by a bevel gear. Further, the number of balls 16a and 16b may be appropriate, and it is possible to use two large diameter balls and one small diameter ball.
[0035]
【The invention's effect】
According to the present invention, since the input side gear is functioned as a swash plate gear by supporting the input side gear on the input member via large and small balls, it is not necessary to subject the input member to inclined surface processing. It is possible to facilitate the processing of each component. Furthermore, by bringing the large and small balls into rolling contact with the input member, it is possible to obtain a reduction ratio of 1/2 when the input side gear is swung, and it is easy to achieve a large reduction ratio while reducing the diameter and size. Can be obtained.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of a gear motor incorporating a speed reducer according to an embodiment of the present invention.
FIG. 2 is an overall cross-sectional view of a motor built-in roller incorporating the gear motor.
FIG. 3 is a simplified enlarged perspective view of a plurality of balls and a retainer.
FIG. 4 is an enlarged cross-sectional view of an input side gear and an output side gear.
5 is a view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor built-in roller 2 Roller body 3 Motor 4 Reduction gear 5 Gear motor housing 6 Gear motor 7 Fixed shaft 8 Fixed shaft 13 Input member 14 Input side gear 15 Output side gear 16a Large diameter ball 16b Small diameter ball

Claims (5)

A motor and a speed reducer are incorporated in a roller main body that is rotatably supported with respect to the fixed shaft. The rotational force of the motor is decelerated by the speed reducer and transmitted to the roller main body, and the roller main body is driven to rotate with respect to the fixed shaft. In the motor built-in roller, the speed reducer includes a disk-shaped input member that is rotationally driven by the rotational force of the motor, and an input side gear that is disposed to face the input member in the axial direction and is prevented from rotating. And an output side gear disposed axially opposed to the input side gear and coupled to the roller body, the input side gear and the output side gear having a predetermined number of teeth difference, and an input member A plurality of balls having different diameters are arranged between the input side gears, and the plurality of balls are in rolling contact with both the input member and the input side gear, and the input side gear is in contact with the plurality of balls. Enter in The gears are inclined with respect to the output side gears, and these gears are meshed in part in the circumferential direction, and the input side gears oscillate according to the circumferential movement of a plurality of balls as the input member rotates, and the input side gears A motor-equipped roller with a reduction gear, wherein a meshing portion between a gear and an output side gear moves in a circumferential direction. The roller with a built-in motor according to claim 1, wherein the motor, the input member, the input side gear, and the output side gear are arranged in series in the axial direction in the cylindrical housing to constitute a gear motor. The side gear is linked to an output shaft that projects outward from the axial end of the cylindrical housing, the gear motor is built in the roller body, and the output shaft is linked to the roller body. A motor built-in roller with a reduction gear. The roller with a built-in motor with a reduction gear according to claim 1 or 2, further comprising a retainer for maintaining a mutual positional relationship between a plurality of balls. A disk-shaped input member that is rotationally driven by the rotational force of the drive source, an input side gear that is disposed opposite to the input member in the axial direction and is prevented from rotating, and an axial direction relative to the input side gear The input side gear and the output side gear have a predetermined number of teeth difference, and a plurality of balls having different diameters are arranged between the input member and the input side gear, The plurality of balls are in rolling contact with both the input member and the input side gear, and the input side gear is in contact with the plurality of balls so that the input side gear is inclined with respect to the output side gear. Engaged in part in the circumferential direction, the input side gear swings according to the circumferential movement of multiple balls as the input member rotates, and the meshed part of the input side gear and output side gear shifts in the circumferential direction A speed reducer characterized by In the speed reducer according to claim 4, comprising a retainer for holding a plurality of mutual positional relationship of the ball, the retainer reduction gear, characterized in that Ru rotatable relative der relative to the input member and the input side gear .

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