JP2020008062A - Magical planetary gear reduction mechanism - Google Patents

Abstract

To provide a magical planetary gear reduction mechanism in which the number of components is reduced to realize weight saving, compactness and low cost.SOLUTION: A magical planetary gear reduction mechanism 100 comprises: a stationary external gear 10; a movable external gear 20 having the same axis and the same diameter as the stationary external gear 10 and having the number of teeth smaller than the stationary external gear by 1; a single planetary gear 30 meshing with the stationary external gear 10 and the movable external gear 20; one or more double planetary gears 40 in which two gears 41, 42 having a phase difference are overlapped such that one of the gears meshes with the stationary external gear 10 and the other meshes with the movable external gear 20; a carrier 5 connecting the single planetary gear 30 and the double planetary gear 40; an input shaft 1 connected to the carrier 5; and an output shaft 2 connected to the movable external gear 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mysterious planetary gear reduction mechanism.

  Conventionally, a reduction mechanism using a planetary gear has been known. The planetary gear has a structure in which a plurality of planetary gears orbit around a sun gear while rotating. There are various types of planetary gears, and the reduction ratio obtained by the type differs.

  Further, a reduction mechanism using a mysterious planetary gear is known. The mysterious planetary gear uses a shift gear as two gears attached to one shaft and having different numbers of teeth, so as to mesh with a common gear and obtain a high reduction ratio.

  Further, Patent Document 1 discloses a first planetary gear that meshes with a fixed internal gear, while a fixed internal gear and a movable internal gear are arranged coaxially with a tooth number difference of 1 as a reduction gear of a mysterious planetary gear mechanism, An invention relating to a reduction gear in which a plurality of coupling gears in which a first planetary gear and a second planetary gear meshing with a movable internal gear with the same number of teeth are coaxially fixed is arranged.

JP 2005-16695 A

  The reduction gear transmission described in Patent Document 1 is designed to obtain a high reduction ratio by setting the difference in the number of teeth between the fixed internal gear and the movable internal gear of the mysterious planetary gear mechanism to one. However, since the fixed internal gear and the movable internal gear are “internal gears”, a plurality of coupling gears including the first planetary gears and the second planetary gears are arranged inside, and mesh with the plurality of coupling gears. The sun gear had to be located in the center. For this reason, the number of parts is increased, and there is room for improvement in terms of weight, mounting space, cost, and the like.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a mysterious planetary gear reduction mechanism that reduces the number of parts and realizes light weight, compactness, and low cost.

  In order to solve the above-mentioned problems, a mysterious planetary gear reduction mechanism of the present invention includes a fixed external gear, a movable external gear having the same diameter as the fixed external gear and having one less tooth, the fixed external gear and the movable external gear. One or more double planetary gears in which one is meshed with the fixed external gear and the other is meshed with the movable external gear, and the single planetary gear; And a carrier connecting the double planetary gear and the double planetary gear, an input shaft connected to the carrier, and an output shaft connected to the movable external gear.

  Preferably, the number of the double planetary gears is one.

  Since the mysterious planetary gear reduction mechanism of the present invention includes the fixed external gear and the movable external gear having the same diameter as the fixed external gear and the same number of teeth as one, a high reduction ratio can be obtained. One or more double planets in which a single planetary gear meshing with a fixed external gear and a movable external gear and two gears having a phase difference are overlapped so that one meshes with the fixed external gear and the other meshes with the movable external gear. Since the gear and the carrier that connects the single planetary gear and the double planetary gear are provided, the input from the input shaft connected to the carrier is reduced from the output shaft connected to the movable external gear. You can extract the output.

  In addition, since the fixed external gear and the movable external gear are external gears, the single planetary gear and the double planetary gear are arranged outside and connected by the carrier, so that the sun gear becomes unnecessary, the number of parts is reduced, and the weight and weight are reduced. Compact and low cost can be realized.

  When there is only one double planetary gear, the number of components can be significantly reduced by adopting a minimum configuration of one single planetary gear and one double planetary gear. Furthermore, it is possible to balance the single planetary gear and the double planetary gear and suppress vibration.

  As described above, according to the present invention, it is possible to provide a mysterious planetary gear reduction mechanism in which the number of parts is reduced, and which is lightweight, compact, and low in cost.

It is the (A) top view and the (B) front view which show the mysterious planetary gear reduction mechanism concerning the embodiment of the present invention. FIG. 1A is a sectional view taken along line aa, FIG. 1B is a sectional view taken along line bb, and FIG.

  Next, a mysterious planetary gear reduction mechanism according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a (A) plan view and (B) front view showing a mysterious planetary gear reduction mechanism 100 according to the present embodiment, and FIG. FIG. 2 is a cross-sectional view taken along line bb, and FIG. The mysterious planetary gear reduction mechanism 100 can be built in, for example, an electric or engine-type winch.

  The mysterious planetary gear reduction mechanism 100 mainly includes a fixed external gear 10, a movable external gear 20, a single planetary gear 30, a double planetary gear 40, a carrier 5, an input shaft 1 and an output shaft 2.

  The fixed external gear 10 is an external gear fixed inside a main body case such as a winch so as not to rotate during operation of the mysterious planetary gear reduction mechanism 100. In the present embodiment, the number of teeth of the fixed external gear 10 is 51.

  The movable external gear 20 is an external gear that has the same diameter as the fixed external gear 10, has the same number of teeth as that of the fixed external gear 10, and is rotated during the operation of the mysterious planetary gear reduction mechanism 100, and is connected to the output shaft 2. In the present embodiment, the number of teeth of the movable external gear 20 is 50.

  The single planetary gear 30 is an external gear that meshes with the fixed external gear 10 and the movable external gear 20, and has a thickness equal to the thickness of the fixed external gear 10 and the movable external gear 20. During the operation of the mysterious planetary gear reduction mechanism 100, it rotates around the fixed external gear 10 and the movable external gear 20 while rotating around the rotating shaft 3 of the carrier 5. In the present embodiment, the number of teeth of the single planetary gear 30 is 28.

  The double planetary gear 40 is formed by stacking two gears 41 and 42 having a phase difference. Of the two gears, one gear 41 functions as a planetary gear for a fixed external gear that meshes with the fixed external gear 10, and the other gear 42 functions as a planetary gear for a movable external gear that meshes with the movable external gear 20. . Therefore, the gear 41 and the gear 42 are overlapped so as to have a phase difference on the circumference of 1/2 tooth. During the operation of the mysterious planetary gear reduction mechanism 100, it rotates around the fixed external gear 10 and the movable external gear 20 while rotating around the rotation shaft 4 of the carrier 5. In the present embodiment, the number of teeth of each of the gears 41 and 42 of the double planetary gear 40 is 28.

  The carrier 5 is a long member, and the single planetary gear 30 and the double planetary gear 40 are rotatably held by the rotating shafts 3 and 4 at both ends of the carrier 5 so that the single planetary gear 30 and the double planetary gear 40 are rotatable. Are linked. In addition, a central portion of the carrier 5 is connected to the input shaft 1. The single planetary gear 30 and the double planetary gear 40 are arranged at opposing positions around the fixed external gear 10 and the movable external gear 20 by the carrier 5.

  Next, the operation of the mysterious planetary gear reduction mechanism 100 will be described. In the stationary state, the fixed external gear 10 and the movable external gear 20 have a phase difference of 0 at the left ends in FIGS. 1 and 2. At the left end, the single planetary gear 30 meshes with the fixed external gear 10 and the movable external gear 20. The fixed external gear 10 and the movable external gear 20 have a phase difference of に お い て at the right ends in FIGS. At the right end, the gear 41 of the double planetary gear 40 meshes with the fixed external gear 10, and the gear 42 of the double planetary gear 40 meshes with the movable external gear 20.

  When electric or engine power is input from the input shaft 1, the carrier 5 rotates about the input shaft 1. Then, the single planetary gear 30 and the double planetary gear 40 rotatably attached to both ends of the carrier 5 rotate around the fixed external gear 10 and the movable external gear 20 while rotating around the rotation shafts 3 and 4. . At this time, the position of the single planetary gear 30 is always in a state of meshing with the portion of the fixed external gear 10 and the movable external gear 20 which are arranged one above the other and have a phase difference of zero. On the other hand, the position of the double planetary gear 40 always meshes with the portion of the fixed external gear 10 and the movable external gear 20 which are arranged one on top of the other and has a phase difference of 位相. Then, with the rotation of the single planetary gear 30 and the double planetary gear 40, the decelerated power is taken out from the output shaft 2 to which the movable external gear 20 rotates slowly while the fixed external gear 10 does not move.

The reduction ratio of the mysterious planetary gear reduction mechanism 100 is expressed by the following equation.
1− (number of teeth of movable external gear / number of teeth of fixed external gear) = 1− (50/51) = 1/51
Note that the number of teeth of the single planetary gear 30 and the number of teeth of the double planetary gear 40 do not affect the reduction ratio, and may be set to a number of teeth that allows smooth engagement with the fixed external gear 10 and the movable external gear 20.

  Since the mysterious planetary gear reduction mechanism 100 according to the present embodiment includes the fixed external gear 10 and the movable external gear 20 having the same diameter as the fixed external gear 10 and the same number of teeth as the fixed external gear 10, a high reduction ratio is obtained. be able to. In addition, the single planetary gear 30 meshing with the fixed external gear 10 and the movable external gear 20 and the two gears 41 and 42 having a phase difference are overlapped so that one meshes with the fixed external gear 10 and the other meshes with the movable external gear 20. And the carrier 5 that connects the single planetary gear 30 and the double planetary gear 40 to each other, so that an input from the input shaft 1 connected to the carrier 5 is provided. In addition, a reduced output can be taken out from the output shaft 2 connected to the movable external gear 20.

In addition, since the fixed external gear 10 and the movable external gear 20 are external gears, the single planetary gear 30 and the double planetary gear 40 are arranged outside and connected by the carrier 5, so that the sun gear becomes unnecessary, and the number of parts is reduced. It is possible to realize light weight, compact size and low cost.
Since there is no meshing part with the sun gear, the durability is excellent.

  Also, since there is one double planetary gear 40, the number of parts can be significantly reduced by using a minimum configuration of one single planetary gear 30 and one double planetary gear 40. Further, the single planetary gear 30 and the double planetary gear 40 are balanced to suppress the vibration.

  As described above, the mysterious planetary gear reduction mechanism 100 according to the present embodiment has a reduced number of parts and is lightweight, compact, and low in cost.

  Although the mysterious planetary gear reduction mechanism according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various other modifications are possible.

  For example, in the above embodiment, the number of double planetary gears is one, but may be two or more. In that case, the phase difference between the two gears constituting the double planetary gear needs to be adjusted to the phase difference between the corresponding fixed external gear and movable external gear according to the position of each of the double planetary gears. is there. In addition, it is preferable that a plurality of planetary gears including the single planetary gear are evenly arranged around the fixed external gear and the movable external gear to achieve a balance.

  In addition, the number of teeth of the fixed external gear and the number of teeth of the movable external gear may be one as long as the difference in the number of teeth is one, and can be configured according to a required reduction ratio.

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Rotating shaft 4 Rotating shaft 5 Carrier 10 Fixed external gear 20 Movable external gear 30 Single planetary gear 40 Double planetary gear 41 Planetary gear for fixed external gear 42 Planetary gear for movable external gear 100 Mysterious planet Gear reduction mechanism

Claims (2)

  A fixed external gear, a movable external gear having the same diameter as the fixed external gear and having the same number of teeth as one, a single planetary gear meshing with the fixed external gear and the movable external gear, and two gears having a phase difference. One or more double planetary gears, one of which meshes with the fixed external gear and the other meshes with the movable external gear, a carrier connecting the single planetary gear and the double planetary gear, and a connection to the carrier. A mysterious planetary gear reduction mechanism having an input shaft connected to the movable external gear and an output shaft connected to the movable external gear.   The mysterious planetary gear reduction mechanism according to claim 1, wherein the number of the double planetary gears is one.

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