CN-121993553-A - Eccentric swing type gear device

Abstract

The invention provides an eccentric swing gear device which is beneficial to inhibiting the roller from tilting when the roller is arranged. The eccentric oscillating gear device is provided with a crankshaft (14) having an eccentric portion (12), an oscillating gear (16) capable of oscillating through the eccentric portion (12), and an eccentric bearing (20) disposed between the eccentric portion (12) and the oscillating gear (16), wherein the eccentric bearing (20) is provided with a roller group (52) composed of a plurality of rollers (50) and is not provided with a retainer for retaining the relative positions of the plurality of rollers (50), wherein the crankshaft (14) is provided with a support portion (60) capable of restricting the axial movement of the corresponding roller group (52), wherein the support portion (60) corresponds to the eccentric portion (12), wherein the eccentric portion (12) is disposed at a position overlapping the roller group (52) corresponding to the support portion (60) in the radial direction of the crankshaft (14), and wherein the outer diameter dimension (L60) from the central axis (L12) of the eccentric portion (12) corresponding to the support portion (60) to the outer circumferential end of the support portion (60) becomes larger than the radius (R) of the roller group (52) corresponding to the support portion (60) in the maximum eccentric direction (Da).

Inventors

• Strong time of plain boiled water
• Yamanaka Tanimurakunikoro

Assignees

• 住友重机械工业株式会社

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241108

Claims (6)

1. 1. An eccentric oscillating gear device is provided with: A crankshaft having an eccentric portion; a swing gear swingably provided through the eccentric portion, and An eccentric bearing disposed between the eccentric portion and the swing gear, The eccentric bearing is provided with a roller group composed of a plurality of rollers, and is not provided with a retainer for retaining the relative positions of the plurality of rollers, The crankshaft is provided with a support part capable of limiting the axial movement of the corresponding roller group, The support portion corresponds to the eccentric portion, the eccentric portion is disposed at a position overlapping the roller group corresponding to the support portion in a radial direction of the crankshaft, An outer diameter dimension from a central axis of the eccentric portion corresponding to the supporting portion to an outer peripheral end of the supporting portion is larger than a circumscribed circle radius of the roller group corresponding to the supporting portion in a maximum eccentric direction of the eccentric portion.
2. 2. The eccentric oscillating type gear device according to claim 1, wherein, The support portion includes an eccentric side region which is a half-circle region located on the maximum eccentric direction side of the eccentric portion with respect to the center axis of the corresponding eccentric portion, The outer diameter dimension of the support portion is larger than a circumscribed circle radius of the roller group corresponding to the support portion in the eccentric side region.
3. 3. The eccentric oscillating type gear device according to claim 2, wherein, The support portion has an anti-decentering side region located at a half-circumference region on the anti-maximum decentering direction side of the eccentric portion with respect to a central axis of the corresponding eccentric portion, The outer diameter dimension of the support portion is larger than a circumscribed circle radius of the roller group corresponding to the support portion in the anti-eccentric side region.
4. 4. The eccentric oscillating type gear device according to claim 1, wherein, The support part comprises a 1 st support part and a2 nd support part, the 2 nd support part faces to the opposite side of the 1 st support part in the axial direction, The roller group includes a1 st roller group limited in axial movement by the 1 st bearing portion and a2 nd roller group limited in axial movement by the 2 nd bearing portion, The eccentric part comprises a1 st eccentric part corresponding to the 1 st supporting part and a2 nd eccentric part corresponding to the 2 nd supporting part, The outer diameter dimension from the central axis of the 1 st eccentric portion to the outer peripheral end of the 1 st supporting portion is larger than the radius of the circumscribed circle of the 1 st roller group in the maximum eccentric direction of the 1 st eccentric portion, An outer diameter dimension from a central axis of the 2 nd eccentric portion to an outer peripheral end of the 2 nd supporting portion is larger than a radius of a circumscribed circle of the 2 nd roller group in a maximum eccentric direction of the 2 nd eccentric portion.
5. 5. The eccentric oscillating type gear device according to claim 1, wherein, The swing gear is disposed opposite to the support portion in the axial direction and is disposed with a gap therebetween.
6. 6. The eccentric oscillating type gear device according to claim 5, wherein, The support part comprises a 1 st support part and a2 nd support part, the 2 nd support part faces to the opposite side of the 1 st support part in the axial direction, The oscillating gear comprises a 1 st oscillating gear axially opposite to the 1 st supporting part and a 2 nd oscillating gear axially opposite to the 2 nd supporting part, The 1 st swing gear is disposed with a gap with respect to the 1 st support portion, The 2 nd swing gear is disposed with a gap with respect to the 2 nd support portion.

Description

Eccentric swing type gear device The present application claims priority based on japanese patent application No. 2024-195973 filed on 11/08 of 2024. The entire contents of this japanese application are incorporated by reference into the present specification. Technical Field The present disclosure relates to an eccentric oscillating gear device. Background Patent document 1 discloses an eccentric oscillating gear device provided with a crankshaft having an eccentric portion, an oscillating gear oscillatable by the eccentric portion, and an eccentric bearing disposed between the eccentric portion and the oscillating gear. The crankshaft includes a support portion capable of restricting axial movement of the eccentric bearing. In the gear device of patent document 1, an outer diameter dimension (described later) from a central axis of the eccentric portion to an outer peripheral end of the supporting portion is smaller than a radius of a circumscribed circle of a plurality of rolling elements used in the eccentric bearing in a maximum eccentric direction of the eccentric portion. Patent document 1 Japanese patent application laid-open No. 2018-119649 As the eccentric bearing, a bearing having a plurality of rollers and not having a cage for holding the relative positions of the plurality of rollers may be used. In this case, when assembling the gear device, it is necessary to dispose a plurality of rollers one by one between the eccentric portion of the crankshaft and the swing gear. The present inventors have realized that with the configuration of patent document 1, there is a problem that the rollers are liable to fall down when performing such a roller arrangement operation. If the rollers are tilted during the placement work of the rollers, it is necessary to take out the tilted rollers and then to reconfigure the rollers, which leads to an increase in work man-hours. Disclosure of Invention Accordingly, an object of the present disclosure is to provide an eccentric oscillating gear device that is advantageous in suppressing tilting of rollers when performing arrangement work of the rollers. The eccentric oscillating gear device includes a crankshaft having an eccentric portion, an oscillating gear oscillatable by the eccentric portion, and an eccentric bearing disposed between the eccentric portion and the oscillating gear. The eccentric bearing is provided with a roller group composed of a plurality of rollers, and is not provided with a retainer for retaining the relative positions of the plurality of rollers. The crankshaft includes a support portion that is capable of restricting axial movement of the corresponding roller group, the support portion corresponding to the eccentric portion, the eccentric portion being disposed at a position overlapping the roller group corresponding to the support portion in a radial direction of the crankshaft, an outer diameter dimension from a central axis of the eccentric portion corresponding to the support portion to an outer peripheral end of the support portion being larger than a circumscribed circle radius of the roller group corresponding to the support portion in a maximum eccentric direction of the eccentric portion. Effects of the invention According to the eccentric oscillating gear device of the present disclosure, it is advantageous to suppress tilting of the rollers when performing arrangement work of the rollers. Drawings Fig. 1 is a side cross-sectional view showing a gear device of an embodiment. Fig. 2 is an enlarged view of the gear arrangement of fig. 1. Fig. 3 (a) is a cross-sectional view showing a part of the section A-A and the 1 st support portion in fig. 2, and fig. 3 (B) is a cross-sectional view showing a part of the section B-B and the 2 nd support portion in fig. 2. Fig. 4 is an explanatory diagram showing a roller arrangement operation using the gear device according to the embodiment. Fig. 5 (a) is a side cross-sectional view showing a main part of the gear device according to the reference embodiment, and fig. 5 (B) is a cross-sectional view showing a part of the C-C section of fig. 5 (a) and the 1 st support portion. Fig. 6 (a) is an explanatory view showing the inclination of the rollers when the gear device of the reference system is used, and fig. 6 (B) is an explanatory view showing the inclination of the rollers when the eccentric portion and the bearing hole are observed from the arrow V direction in fig. 6 (a). In the figure, 10-eccentric oscillating gear device, 12-eccentric part, 12A-1 st eccentric part, 12B-2 nd eccentric part, 14-crankshaft, 16-oscillating gear, 16A-1 st oscillating gear, 16B-2 nd oscillating gear, 20-eccentric bearing, 50-roller, 52-roller group, 52A-1 st roller group, 52B-2 nd roller group, 60-supporting part, 60A-1 st supporting part, 60B-2 nd supporting part, 64-eccentric side region, 66-inverse eccentric side region, 72-gap. Detailed Description Hereinafter, embodiments of an eccentric oscillating