JP2009168193A - Epicycle reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a mechanism horizontally and vertically moving an external gear, in an epicycle reduction gear including an eccentric shaft provided on an input rotating shaft, the external gear provided through a bearing outside of the eccentric shaft and an internal gear inscribed in the external gear. <P>SOLUTION: A primary reduction gear mechanism 31 is provided with: a sun gear 13 fixed to an electric motor 12; a fixed gear 14 formed in a housing 11; an epicyclic gear 15 revolving and rotating by being engaged with the sun gear 13 and fixed gear 14: and an epicyclic gear 24 revolving and rotating by being engaged with the internal gear 22 of an intermediate shaft 23 rotatably supported by a bearing portion 19. A secondary reduction gear mechanism 32 is provided with: an internal gear 28 formed on an output portion 30 rotatably supported by a bearing portion 20; and an external gear 29 vertically and horizontally moved by being engaged with a rotation preventing guide plate 33 rotatably supported by a bearing 27 and movably mounted on a side plate 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reduction gear, and more particularly to an improvement of a planetary gear reduction gear.

Conventionally, this type of planetary gear speed reducer has two or more external gears with different eccentric directions in order to stop the rotation of the external gear and move it in the left-right direction and the up-down direction, and an internal gear on the output side. By providing several rollers, the output unit is decelerated through the inner roller (see, for example, Patent Document 1).
JP 63-214541 A

However, the planetary gear speed reducer disclosed in Patent Document 1 includes at least two external gears with different eccentric directions provided on the input rotation shaft, and several inner roller holes that transmit rotation to the output side, and An inner roller is required. If the accuracy of the inner roller is not uniform, the load may concentrate on some rollers and torque transmission may not be stable, and the complexity of the mechanism increases and the cost increases.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a planetary gear reducer in which torque transmission is stable, the mechanism is simplified, and the cost is reduced.

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that an input side sun gear, a first planetary gear meshing with the sun gear, and the first planetary gear rotate freely. And a carrier that revolves around the sun gear, a fixed internal gear that meshes with the first planetary gear, a second planetary gear that is integral with the first planetary gear, and the second An eccentric shaft provided on an internal gear meshing with the planetary gear, an external gear provided via a bearing outside the eccentric shaft, and an internal gear inscribed in the external gear. In the planetary gear speed reducer, a rotation prevention guide plate is provided on one side surface of the external gear.
According to the present invention, the structure can be simplified, the assembly can be facilitated, and the cost can be reduced.
According to a second aspect of the present invention, the anti-rotation guide plate allows the external gear to move in the vertical direction and the horizontal direction with respect to the housing between the external gear and the housing, and cannot rotate in the rotational direction. Since it is provided in at least two places on the external gear side surface as
Stop the rotation of the external gear, and the torque is transmitted to the internal gear by movement in the vertical and horizontal directions, and the internal gear rotates while decelerating. Therefore, stable transmission can be performed.

  The present invention can simplify the structure, can be easily assembled, and can reduce the cost. Further, the rotation of the external gear is stopped, and the torque is transmitted to the internal gear by movement in the vertical and horizontal directions. The internal gear rotates while decelerating, and an output portion or a speed reduction portion is provided in the internal gear portion. Therefore, stable transmission can be performed.

A planetary gear speed reducer according to the present invention will be described in detail below with reference to the accompanying drawings by giving preferred embodiments.
FIG. 1 is a cross-sectional view of a principal part showing a schematic structure of a planetary gear speed reducer 10 according to an embodiment of the present invention, and FIG. 2 is a side view of FIG.
1 and 2, an electric motor 12 is attached to a side wall surface of a housing 11, and a sun gear 13 is fixed to a drive shaft 12 a of the electric motor 12. As shown in FIG. 8, the sun gear 13 meshes with a fixed gear 14 formed on the housing 11 and meshes with a plurality of, for example, three planetary gears (first planetary gears) 15 that revolve and rotate. The planetary gear 15 is rotatably supported by a carrier 16.

A plurality of, for example, two bearing portions 19 and 20 having two bearings 18 are fitted in the opening hole 17 of the housing 11 through the side plates 21 in the axial direction. An intermediate shaft 23 that forms an internal gear 22 is fitted on the inner peripheral surface of the bearing portion 19. As shown in FIG. 9, the internal gear 22 is formed in the large diameter portion of the intermediate shaft 23 and meshes with a plurality of, for example, three planetary gears (first planetary gears) 24. Since the planetary gear 24 is integrated with the planetary gear 15 and is rotatably supported by the carrier 25, the planetary gear 24 revolves and rotates with respect to the internal gear 22.
The shaft portion 26 of the intermediate shaft 23 is provided with an external gear 29 in contact with or meshing with the internal gear 28 via a bearing 27 outside the eccentric portion. The internal gear 28 is connected to an output portion 30 that is fitted on the inner peripheral surface of the bearing portion 20.

As shown in FIG. 1, a sun gear 13, a fixed gear 14, a planetary gear 15, an internal gear 22 and a planetary gear 24 constitute a primary-side speed reduction mechanism 31. These gears may all be standard gears or modules. It may be changed or a reduction gear may be used to increase the reduction gear ratio. Further, the secondary gear reduction mechanism 32 is constituted by the internal gear 28 and the external gear 29, and the internal gear 28 and the external gear 29 are formed as shift gears so as to have a single-tooth difference gear relationship. Thus, the transition coefficient X6 of the internal gear 28 is set to 1.0, and the transition coefficient X7 of the external gear 29 is set to 0.
Furthermore, the primary side reduction mechanism 31 can reduce the rotation speed of the output unit 30 of the secondary side reduction mechanism 32 by considerably increasing the reduction ratio with respect to the secondary side reduction mechanism 32.
For example, if the number of teeth of the sun gear 13, the planetary gear 15, the fixed gear 14, the planetary gear 24, and the internal gear 22 constituting the primary reduction mechanism 31 is Z1, Z2, Z3, Z4, and Z5, the primary reduction The reduction ratio G31 of the mechanism 31 is as follows.
G31 = (1 + Z3 / Z1) / (1-Z3 / Z2 × Z4 / Z5)
The numbers of teeth of Z1 to Z5 are respectively Z1 = 18, Z2 = 45, Z3 = 108, Z4 = 44,
If Z5 = 107, the reduction ratio G31 = 535 of the primary side reduction mechanism 31 is obtained.
On the other hand, if the number of teeth of the external gear 29 and the internal gear 28 constituting the secondary reduction mechanism 32 is Z6 and Z7, the reduction ratio G32 of the secondary reduction mechanism 32 can be expressed as Z6 / (Z7-Z6). The
If the number of teeth of Z6 and Z7 is Z6 = 100 and Z7 = 101, respectively,
Reduction ratio G32 = 100.

A pair of anti-rotation guide plates 33 for preventing the rotation of the external gear 29 in the diametrical direction are provided in contact with the inner surface of the side plate 21 and the external gear 29 (the left inner surface in FIG. 1). As shown in FIG. 3, the two plates 33 a and 33 b that are substantially orthogonal to each other are integrally formed in a shape. As shown in FIGS. 4 and 5, the rotation preventing guide plate 33 is slidably fitted into a groove 34 provided in the inner surface 21a of the side plate 21 and the plate 33b is inserted as shown in FIGS. Are slidably fitted into a groove 35 provided on one side of the external gear 29.
Therefore, the shaft portion 26 rotates and the eccentric portion of the shaft portion 26 does not rotate the external gear 29 via the bearing 27, and the rotation prevention guide plate 33 is brought into contact with the side plate 21 by the plate 33a. It slides up and down along the groove 21a of 21.

  When the shaft portion 26 rotates and the eccentric portion moves the external gear 29 in the left-right direction in FIG. 2 via the bearing 27, the rotation prevention guide plate 33 is brought into contact with the external gear 29 by the plate 33b. It slides left and right along the groove 35 of the toothed gear 29. Due to this interaction, the external gear 29 moves in the vertical and horizontal directions without rotating, transmits a force to the internal gear 28 inscribed therein, and is decelerated from the output unit 30 to be output. In this case, since the rotation prevention guide plate 33 is disposed in the secondary side reduction mechanism 32, the movement can be extremely reduced. Thereby, noise and vibration generation of the rotation prevention guide plate 33 can be prevented.

  In the present invention, by providing at least two anti-rotation guide plates in the secondary reduction mechanism, torque can be easily transmitted from the external gear to the internal gear, and the structure becomes simple. Furthermore, by combining the primary side reduction mechanism and the secondary side reduction mechanism, a high speed reduction ratio can be achieved, and the movement of the anti-rotation guide plate is reduced, thereby preventing the occurrence of noise and vibration of the anti-rotation guide plate. it can.

1 is a schematic longitudinal sectional view of a planetary gear speed reducer according to an embodiment of the present invention. It is a side view of the planetary gear speed reducer of FIG. It is a schematic perspective view of the rotation prevention guide plate of FIG. It is a substantially longitudinal cross-sectional view of the side plate of FIG. FIG. 5 is a right side view of FIG. 4. FIG. 2 is a schematic longitudinal sectional view of the external gear in FIG. 1. FIG. 7 is a left side view of FIG. 6. It is a copying figure which shows meshing | engagement of the gearwheel in the VIII-VIII line of FIG. It is a copying figure which shows meshing | engagement of the gear in the IX-IX line of FIG. It is a copying figure which shows meshing | engagement of the gearwheel in the XX line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Planetary gear reducer 11 Housing 12 Electric motor 13 Sun gear 14 Fixed gear 15, 24 Planetary gear 16, 25 Carrier 18 Bearing 19, 20 Bearing part 21 Side plate 22, 28 Internal gear 23 Intermediate shaft 29 External gear 30 Output part 31, 32 Deceleration mechanism 33 Anti-rotation guide plate 34, 35 Groove

Claims (2)

  An input-side sun gear, a first planetary gear meshing with the sun gear, a carrier capable of freely rotating the first planetary gear and revolving around the sun gear, and the first planetary gear A fixed internal gear that meshes with the first planetary gear, a second planetary gear that is integral with the first planetary gear, an eccentric shaft that is provided on the internal gear that meshes with the second planetary gear, and the eccentric gear. An anti-rotation guide plate is provided on one side of the external gear in a planetary gear reducer comprising an external gear provided via a bearing outside the shaft and an internal gear inscribed in the external gear. A planetary gear reducer characterized by that.   2. The planetary gear reducer according to claim 1, wherein the rotation prevention guide plate allows the external gear to move in the vertical direction and the horizontal direction with respect to the housing between the external gear and the housing. At least two planetary gear reducers are provided on the side surface of the external gear so as not to rotate.

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