JP4767979B2 - Eccentric rocking speed reducer - Google Patents

Description

The present invention relates to an eccentric oscillating speed reducer that decelerates and outputs motor rotation.

  A motor in which a speed reducer is combined is known from, for example, Patent Document 1 below, and a cross-sectional view of the main part of the motor and the speed reducer is shown in FIG. The reduction gear 54 decelerates and transmits the rotation of the input rotation shaft 52 of the motor 51 through the gears 56, 57, 58, and 59 to rotate the output shaft 57. The motor 51 is attached to the speed reducer 54 by connecting the case 51 a of the motor 51 and the bracket 55 of the speed reducer 51 via the partition plate 53. The partition plate 53 has an attachment spigot portion 53a with a step on the motor side, and similarly has a mounting spigot portion 53b with a step on the reduction gear side, and the motor 51 and the reduction gear 54 with the attachment spigot portions 53a and 53b. And the motor 51 and the speed reducer 54 are positioned.

However, since there are steps in the attachment spigot portions 53a and 53b, this portion cannot be polished, and the attachment spigot portions 53a and 53b cannot be processed with high accuracy. Since the motor 51 and the speed reducer 54 are connected and positioned by the mounting spigot portions 53a and 53b of the partition plate 53, the mounting spigot portions 53a and 53b have insufficient accuracy such as parallelism and squareness, and therefore rotation accuracy. In addition, it could not be applied to an indexing device that requires high accuracy in terms of surface accuracy.
Japanese Utility Model Publication No. 1-135259

An object of the present invention is to provide an eccentric oscillating speed reducer.

The eccentric oscillating speed reducer according to the present invention includes an internal gear 25 provided on the inner peripheral portion of the fixed portion 20, external gears 23 and 24 meshing with the internal gear 25, and external gears via bearings. A plurality of crankshafts 22 that are supported so as to be capable of revolving with respect to the central axis of the internal gear 25, and are rotatably coupled to the fixed portion 20 via rolling bearings 29 and 30. An output shaft 15 that is rotatably supported through a bearing, and a central portion in a direction orthogonal to the rotation center line P direction of the output shaft 15 and a rotation center line P direction with reference to one end face 15b of the output shaft 15 In the eccentric oscillating speed reducer having an end portion 41 protruding to the end and supported by the output shaft 15, the cylindrical member 40 is fixed to the output shaft 15 at one end side thereof. end 41 is the output shaft of the one end It characterized in that it is the inner peripheral section rotating center line P direction single engagement portion engaging enters the 16b of the mating member which is connected to 5.

According to this eccentric oscillating speed reducer, the end portion 41 of the cylindrical member 40 protruding from the one end surface 15 b of the output shaft 15 is the inner periphery of the counterpart member such as the table 16 connected to the output shaft 15. Since it is a single engagement portion in the direction of the rotation center line P that engages with the portion 16b, when the counterpart member is attached to the output shaft 15 and connected, positioning such as centering with the counterpart member is easy. Become. Moreover, it is preferable that the engaging part of the edge part 41 has a level | step difference, and in this case, an engaging part enters into the inner peripheral part 16b of the other party member at a level | step difference, and is engaged.

Mating member are connected is attached to the output shaft Rutoki, it becomes easy to position the centering etc. to the opposing member, yet can be performed with high accuracy.

According to the present invention, positioning such as centering with the counterpart member connected to the output shaft of the speed reducer is facilitated.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a front view of a reduction gear with a motor according to the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is the direction along line III-III in FIG. FIG. 4 is a rear view of the speed reducer with a motor shown in FIG. 1.

  As shown in the figure, the speed reducer with motor of the present embodiment is provided between the motor 11, the eccentric rocking type speed reducer 12 that decelerates the rotation of the motor 11, and the motor 11 and the speed reducer 12. A partition member 13 and a support 14 that supports the speed reducer 12 are provided.

  An input gear 17 for inputting the rotation of the motor 11 to the speed reducer 12 is provided between the speed reducer 12 and the partition member 13. The input gear 17 is rotatably supported at both ends by the output shaft 15 of the speed reducer 12 and the partition member 13 via a first bearing 18 and a second bearing 19, respectively. The motor 11 is fixed to the opposite side of the speed reducer 12 of the partition member 13, and the gear 11 b fixed to the rotating shaft 11 a meshes with the input gear 17 to rotate the input gear 17.

  The eccentric oscillating speed reducer 12 is provided on the gear 21 that meshes with the input gear 17 and rotates by the rotation of the motor 11, the fixed portion 20 that is fixed to the support 14, and the inner peripheral portion of the fixed portion 20. An internal gear 25 composed of a plurality of pins (internal teeth), and an external gear that has external teeth with a different number of teeth from the internal gear 25 at a predetermined pitch corresponding to the internal gear 25 and meshes with the internal gear 25. Rolls with respect to the stationary gears 23 and 24, a plurality of crankshafts 22 that support the external gears 23 and 24 eccentrically with respect to the central axis of the internal gear 25 via bearings and capable of revolving. An output shaft 15 is rotatably coupled via bearings 29 and 30 and rotatably supports both ends of the crankshaft 22 via bearings. Such an eccentric oscillating speed reducer is known as a high precision speed reducer.

The output shaft 15 rotates about the rotation center line P , and a table 16 is connected to the output shaft 15. As shown in FIG. 3, a proximity sensor 34 is disposed on the support 14, and the origin of the reduction gear can be set by detecting a detection piece 33 provided on the table 16. Further, as shown in FIG. 1, a plurality of T-shaped grooves 16a into which T-shaped groove nuts are inserted are formed on the outer surface of the table 16.

When at least one of the plurality of crankshafts 22 is rotated by the rotational force of the motor 11 being transmitted through the gear 21 and the input gear 17 mounted on the shaft end portion, the external gears 23 and 24 are rotated. While revolving, the gear engages with the internal gear 25 having, for example, one tooth number larger than the number of teeth of the external gears 23 and 24. The external gears 23 and 24 rotate corresponding to the difference in the number of teeth per revolution (1), whereby the output shaft 15 is centered on the rotation center line P corresponding to the rotation of the external gears 23 and 24. And the deceleration output can be taken out, and the table 16 can be rotated.

  As shown in FIGS. 2 and 3, the fixed portion 20 of the speed reducer 12 is provided with a high-accuracy flat surface 20 a that is flattened by polishing or the like. Further, the partition member 13 has both end surfaces 13a and 13b formed into a highly accurate flat surface by planar processing such as polishing, and the one end surface 13a is finished in a parallel plane with the other end surface 13b of the flat surface as a reference surface. Yes.

Moreover, the support body 14 has a ring-shaped frame 14b fitted to the outer periphery of the fixed portion 20 of the speed reducer 12, and an attachment portion 14c attached to a base (not shown). The surface 14a of the ring-shaped frame 14b constitutes a high-precision plane 14a by planar processing such as polishing, and the support surface 14d of the mounting portion 14c is formed at right angles to the plane 14a of the ring-shaped frame 14b. Further, the mounting portion 14c is provided with a key groove 14e on the support surface 14d as a parallel determining means extending in a direction parallel to the rotation center line P of the output shaft 15 of the speed reducer 12, and the speed reducer 12 is parallel to the rotation center line P. The position is restricted to.

  As described above, the support 14 and the fixing portion 20 of the speed reducer 12 are not a single member but are separate members, so that the support body depends on the counterpart base to which the speed reducer with the motor is attached. It is possible to respond by simply changing the shape, dimensions, etc., and it is convenient because of its versatility.

  The flat surface 14a of the support 14 and the flat surface 20a of the fixed portion 20 constitute the same plane. The partition member 13 is fixed to the fixing portion 20 by a plurality of bolts 31 at the fixing portion 20 so that the one end surface 13a that has been flattened comes into contact with and closely contacts the flat surface 14a of the support 14 and the flat surface 20a of the fixing portion 20. Fixed and attached. Further, the motor 11 is attached to the other end surface 13 b of the partition member 13, and the central portion thereof is sealed with a seal portion 32.

In addition, a through-hole 13c into which a first bearing 18 for rotatably supporting one end of the input gear 17 is provided in the central portion of the partition member 13. A central hole 15a for inserting a second bearing 19 that rotatably supports the other end of the input gear 17 is provided at the center of the output shaft 15 of the speed reducer 12. The through-hole 13c is machined at a right angle by cutting with respect to the other end surface 13b that has been machined, and the center hole 15a is cut coaxially with the holding portion of the bearing 29 at a right angle to the plane of the output shaft 15 .

  When the first and second bearings 18 and 19 at both ends of the input gear 17 are disposed in the through hole 13c of the partition member 13 and the central hole 15a of the output shaft 15 of the speed reducer 12, the inner diameters of the through hole 13c and the central hole 15a Since the surface is machined with high accuracy, the centers of the partition member 13 and the speed reducer 12 can be made to coincide with each other, and the partition member 13 and the speed reducer 12 can be accurately positioned without providing a mounting spigot portion as in the prior art. be able to. Furthermore, the matching accuracy can be increased by reducing the fitting tolerance width of the outer diameter and the hole diameter of the bearing.

In the through hole 13c and the central hole 15a to which the first and second bearings 18 and 19 are attached, the inner surface parallel to the rotation center line P only needs to be accurate, and the surface in the direction orthogonal to the rotation center line P is sufficient. Therefore, it is not necessary to process the step with high accuracy, and the inner diameter surfaces of the through hole 13c and the central hole 15a can be easily processed by simple cutting.

  As described above, the partition member 13 is attached to the fixed portion 20 with its one end surface 13 a subjected to planar processing being in close contact with the flat surface 20 a of the fixed portion 20 of the speed reducer 12 and the flat surface 14 a of the frame 14 b of the support 14. These surfaces 13a, 20a, and 14a are all high-precision planes, and the partition member 13 and the speed reducer 12 can be connected to the first and the first without the stepped portion of the attachment spigot portion as in the prior art. Since the second bearings 18 and 19 can be positioned with high accuracy, they can be coupled with high accuracy on the same surface. Therefore, when the rotation of the motor 11 is decelerated from the output shaft 15 via the input gear 17, the external gears 23 and 24, the internal gear 25, and the like as described above, the rotation of the motor 11 is highly accurate. Therefore, the rotation accuracy and the rotation surface accuracy of the output shaft 15 are high. Further, since the surfaces 13a, 20a, and 14a are flat surfaces, there is no need for a costly grinding process by an expensive grinder for level difference processing, and high precision can be easily achieved by simple grinding / polishing. It can be processed into a flat surface, and the processing cost does not increase.

  The speed reducer with motor according to the present embodiment is attached to a milling machine as a base, for example, with a support surface 14d of the support 14, and used to configure an indexing device attached to the milling machine with the table 16 as an indexing base, for example. However, in this case, since the table 16 rotates with high precision in the same manner as the output shaft 15, the indexing accuracy in the indexing device can be improved.

Further, since the speed reducer 12 can be regulated in a direction parallel to the rotation center line P of the output shaft 15 by the keyway 14e as a parallel determining means provided in the mounting portion 14c of the support body 14, the speed reducer with a motor is supported. The support surface 14d of the body 14 can be attached to, for example, a milling machine with high accuracy, and the centering adjustment with the center of the table 16 can be performed with high accuracy.

  As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, the speed reducer with a motor according to the present embodiment can be attached to a milling machine and the table 16 can be used as an index table, but is not limited thereto, and may be provided in other devices. .

It is a front view of the reduction gear with a motor of this embodiment. It is sectional drawing which cut | disconnected in the II-II line direction of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. It is a rear view of the reduction gear with a motor of FIG. It is longitudinal direction sectional drawing of the conventional reduction gear with a motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Motor 12 Reduction gear 13 Partition member 13a One end surface 13b of partition member The other end surface of partition member 14 Support body 14a Plane 14d Support surface 14e Key groove (parallel determination means)
DESCRIPTION OF SYMBOLS 15 Output shaft 17 Input gear 18 1st bearing 19 2nd bearing 20 Fixed part of reduction gear 12 20a Plane of fixed part
P output shaft rotation center line

Claims (2)

An internal gear provided on the inner peripheral part of the fixed part;
An external gear meshing with the internal gear;
A plurality of crankshafts that support the external gear via a bearing so as to be capable of revolving with respect to a central axis of the internal gear;
An output shaft that is rotatably coupled to the fixed portion via a rolling bearing, and that rotatably supports both ends of the crankshaft via the bearing;
The output shaft is located at the center of the output shaft in a direction orthogonal to the rotation center line direction, and has an end protruding in the rotation center line direction with reference to one end surface of the output shaft, and is supported by the output shaft. An eccentric oscillating speed reducer comprising a cylindrical member,
The cylindrical member is fixed to the output shaft at one end side , and the end portion on the one end side enters and engages with the inner peripheral portion of the mating member connected to the output shaft. An eccentric oscillating speed reducer characterized by being an engaging portion.   The eccentric oscillating speed reducer according to claim 1, wherein the engaging portion of the end portion has a step.

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