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CN-113958664-B - Speed reducing mechanism and driving device

CN113958664BCN 113958664 BCN113958664 BCN 113958664BCN-113958664-B

Abstract

The invention provides a speed reducing mechanism and a driving device. The speed reduction mechanism according to an embodiment of the present invention includes a two-stage planetary gear mechanism, a1 st planetary gear carrier that restricts the falling of a2 nd planetary gear of the 2 nd planetary gear mechanism from a2 nd support shaft portion, and an annular 2 nd thrust plate that is provided between the 1 st planetary gear carrier and the 2 nd planetary gear and into which the 2 nd support shaft portion is inserted. The thickness of the 2 nd thrust plate is larger than the interval between the top end surface of the 2 nd support shaft portion and the 1 st planetary carrier.

Inventors

  • Lin Daijie

Assignees

  • 纳博特斯克有限公司

Dates

Publication Date
20260512
Application Date
20210716
Priority Date
20200720

Claims (8)

  1. 1. A speed reducing mechanism, wherein, The speed reducing mechanism includes: A planetary gear mechanism having a sun gear, a planetary gear meshed with the sun gear, and a planetary gear carrier provided with a support shaft portion for rotatably supporting the planetary gear in a protruding manner; a restricting portion that restricts the falling off of the planetary gear from the support shaft portion, and An annular thrust plate provided between the planetary gear and the regulating portion, and having a distal end surface of the support shaft portion on the regulating portion side inserted therein, The maximum thickness of the portion of the thrust plate having the maximum thickness is larger than the interval between the tip end surface of the support shaft portion on the side of the regulating portion and the regulating portion, The thrust plate protrudes toward the restricting portion side from the tip end of the support shaft portion.
  2. 2. The reduction mechanism according to claim 1, wherein, The planetary gear has an insertion hole into which the support shaft portion is inserted, and a recess portion formed on an inner peripheral side of the planetary gear at one end surface on the restriction portion side so as to communicate with the insertion hole, The thrust plate is disposed in the recess, The recess has an inner side surface that restricts displacement of the thrust plate in the radial direction.
  3. 3. The reduction mechanism according to claim 2, wherein, The speed reducing mechanism has a bearing fitted to an outer peripheral surface of the support shaft portion and fitted to an inner peripheral surface of the insertion hole of the planetary gear for rotatably supporting the planetary gear with respect to the support shaft portion, The thrust plate is disposed at a position overlapping the bearing over the entire circumference of the thrust plate in the axial direction of the support shaft.
  4. 4. The reduction mechanism according to any one of claim 1 to 3, wherein, The thrust plate has a fluid passage formed so as to penetrate in the axial direction of the support shaft portion, and is capable of passing a fluid therethrough.
  5. 5. The reduction mechanism according to any one of claim 1 to 3, wherein, The planetary gear mechanism has a plurality of the planetary gears and the support shaft portion respectively, The plurality of planetary gears are each provided with the thrust plate.
  6. 6. The reduction mechanism according to any one of claim 1 to 3, wherein, A plurality of the planetary gear mechanisms are arranged along the axial direction of the supporting shaft part, The restriction portion is the planetary carrier that is disposed between the planetary gear of one of the planetary gear mechanisms and the planetary gear of the other of the planetary gear mechanisms that are adjacent to each other in the axial direction.
  7. 7. A speed reducing mechanism, wherein, The speed reducing mechanism includes: a plurality of planetary gear mechanisms, and A thrust plate provided between the two planetary gear mechanisms, The planetary gear mechanism includes: A sun gear; a planetary gear meshed with the sun gear, and revolved around the sun gear due to rotation of the sun gear; a carrier provided with a support shaft portion for rotatably supporting the planetary gear in a protruding manner, the carrier being rotatable about a central axis of the sun gear, and A bearing fitted to an outer peripheral surface of the support shaft portion for rotatably supporting the planetary gear to the support shaft portion, The plurality of planetary gear mechanisms are arranged along an axial direction of the support shaft portion, and the planetary gear of one of the planetary gear mechanisms adjacent to each other in the axial direction is arranged in an adjacent arrangement with the planetary gear carrier of the other planetary gear mechanism, The thrust plate is formed in a ring shape inserted into a distal end surface of the support shaft portion of one of the planetary gear mechanisms on the side of the carrier of the other planetary gear mechanism, is disposed between the planetary gear of the one planetary gear mechanism and the carrier of the other planetary gear mechanism, is disposed at a position overlapping the bearing over the entire circumference of the thrust plate in the axial direction of the support shaft portion, The maximum thickness of the portion of the thrust plate having the largest thickness is larger than the interval between the top end face of the support shaft portion of the one of the planetary gear mechanisms and the carrier of the other of the planetary gear mechanisms, The thrust plate protrudes toward the carrier side of one of the planetary gear mechanisms than the tip end of the support shaft portion of the other planetary gear mechanism.
  8. 8. A driving device, wherein, The driving device is provided with: speed reducing mechanism, and A drive source that transmits a drive force to the reduction mechanism, The speed reduction mechanism includes: The planetary gear mechanism comprises a sun gear, a planetary gear meshed with the sun gear and revolving around the sun gear due to rotation of the sun gear, and a planetary gear carrier provided with a support shaft part for supporting the planetary gear in a freely rotatable manner in a protruding manner, wherein the planetary gear carrier is freely rotatable around a central axis of the sun gear; a restricting portion that restricts the falling off of the planetary gear from the support shaft portion, and An annular thrust plate provided between the planetary gear and the regulating portion, and having a distal end surface of the support shaft portion on the regulating portion side inserted therein, The maximum thickness of the portion of the thrust plate having the maximum thickness is larger than the interval between the tip end surface of the support shaft portion on the side of the regulating portion and the regulating portion, The thrust plate protrudes toward the restricting portion side from the tip end of the support shaft portion.

Description

Speed reducing mechanism and driving device Technical Field The present invention relates to a reduction mechanism and a driving device. Background Generally, a multistage planetary gear mechanism is used as a reduction mechanism. Each stage of the multistage planetary gear mechanism includes a sun gear integrally provided with a rotation shaft on an input side, a planetary gear meshed with the sun gear, and a planetary carrier rotatably supporting the planetary gear and integrally provided with the rotation shaft on an output side. The planetary gear is rotatably supported by a support shaft provided on the planetary carrier. Various techniques for restricting the falling-off of a planetary gear with respect to a support shaft portion in order to prevent the planetary gear of any stage from coming into contact with a carrier of another stage adjacent to the planetary gear are disclosed. For example, a technique is disclosed in which a thrust plate (thrust ring) is fixed to an end surface of a support shaft portion by a bolt, and the thrust plate (thrust ring) is formed in a ring shape so as to traverse the support shaft portion and the end surface of a planetary gear (for example, refer to patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 9-269036 Disclosure of Invention Problems to be solved by the invention However, in the above-described conventional technique, since it is necessary to form an internal thread for fastening a bolt in the support shaft portion or a hole for passing a bolt in the thrust plate, there is a possibility that the structure becomes complicated. The invention provides a reduction mechanism and a driving device capable of simplifying the structure even if a thrust plate for preventing undesired contact of components is provided. Solution for solving the problem (1) The speed reduction mechanism according to one aspect of the present invention includes a planetary gear mechanism having a sun gear, a planetary gear engaged with the sun gear, and a planetary carrier provided with a support shaft portion for rotatably supporting the planetary gear in a protruding manner, a regulating portion for regulating the falling-off of the planetary gear from the support shaft portion, and an annular thrust plate provided between the planetary gear and the regulating portion and having the support shaft portion inserted therein, wherein a maximum thickness of a portion of the thrust plate having a maximum thickness is larger than a distance between a tip end surface of the support shaft portion on a side of the regulating portion and the regulating portion. With this configuration, the thrust plate can be used to restrict the falling of the planetary gear from the support shaft portion without fixing the thrust plate to the support shaft portion. Therefore, the structure of the reduction mechanism can be simplified. The maximum thickness of the thrust plate is larger than the interval between the restriction portion and the distal end surface of the support shaft portion on the restriction portion side, and therefore, the planetary gear, the support shaft portion, and the restriction portion can be prevented from being in direct contact. (2) The planetary gear may have an insertion hole into which the support shaft portion is inserted, and a recess portion formed on an inner peripheral side of the planetary gear so as to communicate with the insertion hole on one end surface on the side of the restriction portion, wherein the thrust plate is disposed in the recess portion, and the recess portion has an inner side surface that restricts displacement of the thrust plate in a radial direction. (3) The reduction mechanism may have a bearing fitted to an outer peripheral surface of the support shaft portion and fitted to an inner peripheral surface of the insertion hole of the planetary gear, the reduction mechanism may rotatably support the planetary gear with respect to the support shaft portion, and the thrust plate may be disposed at a position overlapping the bearing over an entire circumference of the thrust plate in an axial direction of the support shaft portion. (4) The thrust plate may have a fluid passage formed so as to penetrate in the axial direction of the support shaft portion, and the fluid passage may be configured to allow fluid to pass therethrough. (5) The planetary gear mechanism may have a plurality of the planetary gears and the support shaft portion, and the thrust plate may be provided for each of the plurality of the planetary gears. (6) The plurality of planetary gear mechanisms may be arranged along an axial direction of the support shaft portion, and the restriction portion may be the planetary carrier arranged between the planetary gear of one of the planetary gear mechanisms and the planetary gear of the other planetary gear mechanism, which are adjacent to each other in the axial direction. (7) The reduction mec