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DE-102025142128-A1 - Eccentrically Oscillating Gear Device

DE102025142128A1DE 102025142128 A1DE102025142128 A1DE 102025142128A1DE-102025142128-A1

Abstract

An eccentrically oscillating gear device (10) is provided which is advantageous in that it suppresses the tipping of a roller during the operation of arranging rollers (50). An eccentrically oscillating gear device (10) comprises a crankshaft (14) containing eccentric sections (12), oscillating gears (16) capable of oscillating using the eccentric sections (12), and eccentric bearings (20), each of which is arranged between the eccentric section (12) and the oscillating gear (16). The eccentric bearings (20) contain roller assemblies (52) consisting of several rollers (50) and do not include a cage for holding relative positions of the several rollers (50). The crankshaft (14) contains receiving sections (60) capable of limiting axial movement of the corresponding roller assemblies (52). The receiving section (60) corresponds to the eccentric section (12) located at a position that overlaps with the roller assembly (52) corresponding to the receiving section (60) in a radial direction of the crankshaft (14). An outer radius dimension (L60) between a central axis (L12) of the eccentric section (12) corresponding to the receiving section (60) and an outer circumferential end of the receiving section (60) is larger than a circumscribed circular radius (R52) of the roller assembly (52) corresponding to the The receiving section (60) corresponds to a maximum eccentric direction (Da) of the eccentric section (12).

Inventors

  • Kenji Shirouzu
  • Teijiro Yamanaka

Assignees

  • SUMITOMO HEAVY INDUSTRIES, LTD.

Dates

Publication Date
20260513
Application Date
20251015
Priority Date
20241108

Claims (6)

  1. Eccentrically oscillating gear device (10), comprising: a crankshaft (14) containing eccentric sections (12); oscillating gears (16) capable of oscillating using the eccentric sections (12); and eccentric bearings (20), each of which is arranged between the eccentric section (12) and the oscillating gear (16), the eccentric bearings (20) comprising roller assemblies (52) consisting of multiple rollers (50) and not comprising a cage for holding relative positions of the multiple rollers (50), the crankshaft (14) comprising receiving sections (60) capable of limiting axial movement of the corresponding roller assemblies (52), the receiving section (60) corresponding to the eccentric section (12) being arranged at a position overlapping with the roller assembly (52) corresponding to the receiving section (60) in a radial direction of the crankshaft (14), and an outer radius dimension (L60) between a central axis (L12) of the eccentric section (12) corresponding to the receiving section (60) and an outer circumferential end of the receiving section (60) is larger than a circumscribed circular radius (R52) of the roller group (52) corresponding to the receiving section (60) in a maximum eccentric direction (Da) of the eccentric section (12).
  2. Eccentrically oscillating gear device (10) according to Claim 1 , wherein the receiving section (60) includes an eccentric side region (64) which is a semicircular region positioned on one side of the central axis (L12) of the corresponding eccentric section (12) corresponding to the maximum eccentric direction (Da) of the eccentric section (12), and the outer radius dimension (L60) of the receiving section (60) is greater than the circumscribed circular radius (R52) of the roller group (52) corresponding to the receiving section (60) in the eccentric side region (64).
  3. Eccentrically oscillating gear device (10) according to Claim 2 , wherein the receiving section (60) includes a counter-eccentric side region (66) which is a semicircular region positioned on one side of the central axis (L12) of the corresponding eccentric section (12) corresponding to a counter-maximal eccentric direction (Da) of the eccentric section (12), and the outer radius dimension (L60) of the receiving section (60) is larger than the circumscribed circular radius (R52) of the roller group (52) corresponding to the receiving section (60) in the counter-eccentric side region (66).
  4. Eccentrically oscillating gear device (10) according to Claim 1 , wherein the receiving sections (60) comprise a first receiving section (60A) and a second receiving section (60B) facing a side opposite the first receiving section (60A) in an axial direction, the roller groups (52) comprise a first roller group (52A) whose axial movement is limited by the first receiving section (60A), and a second roller group (52B) whose axial movement is limited by the second receiving section (60B), the eccentric sections (12) comprise a first eccentric section (12A) corresponding to the first receiving section (60A), and a second eccentric section (12B) corresponding to the second receiving section (60B), and an outer radius dimension (L60) between a central axis (L12) of the first eccentric section (12A) and an outer circumferential end of the first receiving section (60A) greater than a circumscribed circular radius (R52) of the first roller group (52A) in a maximum eccentric direction (Da) of the first eccentric section (12A), and an outer radius dimension (L60) between a central axis (L12) of the second eccentric section (12B) and an outer circumferential end of the second receiving section (60B) is larger than a circumscribed circular radius (R52) of the second roller group (52B) in a maximum eccentric direction (Da) of the second eccentric section (12B).
  5. Eccentrically oscillating gear device (10) according to Claim 1 , wherein the oscillating gear (16) is directed towards the receiving section (60) in an axial direction and is provided with a gap (72) from the receiving section (60).
  6. Eccentrically oscillating gear device (10) according to Claim 5 , wherein the receiving sections (60) comprise a first receiving section (60A) and a second receiving section (60B) facing a side opposite the first receiving section (60A) in the axial direction, the oscillating gears (16) comprise a first oscillating gear (16A) facing the first receiving section (60A) in the axial direction, and a second oscillating gear (16B) facing the second receiving section (60B) in the axial direction, the first oscillating gear (16A) being provided with a gap (72) from the first receiving section (60A), and the second oscillating gear (16B) being provided with a The gap (72) is provided by the second receiving section (60B).

Description

BACKGROUND OF THE INVENTION Field of invention The present disclosure relates to an eccentrically oscillating gear device. This application claims priority from Japanese patent application no. 2024-195973 , submitted on November 8, 2024, which is incorporated herein in its entirety by reference. Description of the state of the art Japanese Unexamined Patent Publication No. 2018-119649 Disclosing an eccentrically oscillating gear device, comprising a crankshaft containing eccentric sections, oscillating gears capable of oscillating using the eccentric sections, and eccentric bearings, each arranged between the eccentric section and the oscillating gear. The crankshaft includes receiving sections capable of limiting axial movement of the eccentric bearings. In the Japanese unexamined patent publication No. 2018-119649 In the disclosed gear device, an outer radius dimension (to be described later) between a central axis of the eccentric section and an outer circumferential end of the receiving section is set such that it is smaller than a circumscribed circular radius of several rolling elements used for the eccentric bearing in a maximum eccentric direction of the eccentric section. SUMMARY OF THE INVENTION A bearing containing multiple rollers and lacking a cage to maintain the relative positions of those rollers can be used as an eccentric bearing. In this case, individual positioning of the multiple rollers between the eccentric section of the crankshaft and the oscillating gear is required during assembly of the gear assembly. The present inventor has recognized that there is a problem in the fact that the role during the work of arranging the roles in the Japanese unexamined patent publication no. 2018-119649 The revealed structure is likely to tip over. In a case where a roll tips over during the work of arranging the rolls, time and effort are required to retrieve the tipped-over roll and rearrange it, causing an increase in working hours. Therefore, one objective of the present disclosure is to provide an eccentrically oscillating gear device which is advantageous in that it suppresses the tipping of a roller during the operation of arranging rollers. An eccentrically oscillating gear device according to one aspect of the present disclosure comprises a crankshaft containing eccentric sections, oscillating gears capable of oscillating using the eccentric sections, and eccentric bearings, each of which is arranged between the eccentric section and the oscillating gear. The eccentric bearings contain roller assemblies consisting of multiple rollers and do not include a cage for holding relative positions of the multiple rollers. The crankshaft contains receiving sections capable of limiting axial movement of the corresponding roller assemblies. The receiving section corresponds to the eccentric section, which is located at a position that overlaps with the roller assembly corresponding to the receiving section in a radial direction of the crankshaft. An outer radius dimension between a central axis of the eccentric section corresponding to the receiving section and an outer circumferential end of the receiving section is greater than a circumscribed circular radius of the roller assembly corresponding to the receiving section in a maximum eccentric direction of the eccentric section. According to the eccentrically oscillating gear device of the aspect of the present disclosure, it is advantageous to suppress tipping of a roller during work of arranging rollers. BRIEF DESCRIPTION OF THE FIGURES 1 is a lateral cross-sectional view of a gear device according to one embodiment.2 is an enlarged view of the in 1 gear device shown.3A is a cross-sectional view showing part of a cross-section along line AA of 2 and shows an initial reception section, and 3B is a cross-sectional view showing part of a cross-section along line BB from 2 and shows a second reception section.4 is a diagram showing the operation of arranging a roller using the gear device according to the embodiment.5A is a side cross-sectional view showing a main part of a gear device according to a reference design form, and 5B is a cross-sectional view that shows part of a cross-section along line CC of 5A and shows an initial reception section.6A is a diagram showing the inclination of a roller in a case where the gear device is used according to the reference embodiment, and 6B is a diagram showing the tipping of the roller in a case where an eccentric section and a bearing hole are in one direction of an arrow V from 6A It is shown that it can be considered. DETAILED DESCRIPTION OF THE INVENTION An eccentrically oscillating gear device according to an embodiment of the present disclosure is described below. The same or equivalent components are designated by the same reference numerals, and their repeated description is omitted. In each drawing, components are omitted, enlarged, or reduced as necessary for the sake of simplicity. The drawings ar