CYCLOID SPEED REDUCER

• US 20200132166A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 05/03/2017
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chung, Chi-Wen, Chu, En-Yi, Lin, Hung-Wei, Tsao, Ming-Li, Tsai, Ching-Hsiung
• Granted Patent: US 11,168,763 B2
• Time in Patent Office: Days
• CPC Class Codes: F16H 1/32 in which the central axis of the gearing lies inside the periphery of an orbital gear
• CPC Class Codes: F16H 2001/325 comprising a carrier with pins guiding at least one orbital gear with circular holes
• CPC Class Codes: F16H 55/34 Non-adjustable friction discs

Abstract

A two-stage cycloid speed reducer comprises two rotating disc assemblies. Each rotating disc assembly comprises two cycloid discs. In other words, the cycloid speed reducer has four cycloid discs to be in contact with the corresponding rollers. Consequently, the load withstood by each cycloid disc is reduced. Since the cycloid speed reducer has stronger structural strength, the cycloid speed reducer can be applied to the high-load circumstance. Moreover, an eccentric assembly of the eccentric device includes a plurality of eccentric cylinders. The eccentric cylinders are disposed within the axle holes of the corresponding cycloid discs. Due to the eccentric cylinders, the eccentric direction of two cycloid discs is opposite to the eccentric direction of the other two cycloid discs. Consequently, it is not necessary to install an additional weight compensation device in the cycloid speed reducer to compensate the dynamic equilibrium. Moreover, the cycloid speed reducer can be assembled easily.

Claims

1. A cycloid speed reducer, comprising:

an eccentric device comprising a rotating shaft and an eccentric assembly, wherein the rotating shaft is rotatable and the eccentric assembly is eccentrically fixed on the rotating shaft and arranged between a first end and a second end of the rotating shaft, wherein the eccentric assembly is driven by the rotating shaft to eccentrically rotate relative to an axle center of the rotating shaft;

a first roller assembly comprising a first wheel disc and a plurality of first rollers, wherein the first rollers are disposed on the first wheel disc;

a second roller assembly comprising a second wheel disc and a plurality of second rollers, wherein the second rollers are disposed on the second wheel disc;

a first rotating disc assembly disposed on the eccentric assembly and rotated with the eccentric assembly, and comprising two cycloid discs arranged adjacent to each other, wherein each of the two cycloid discs of the first rotating disc assembly comprises at least one outer tooth and at least one perforation, and the at least one outer tooth is in contact with the corresponding first roller of the first rollers;

a second rotating disc assembly disposed on the eccentric assembly and rotated with the eccentric assembly, and comprising two cycloid discs arranged adjacent to each other, wherein each of the two cycloid discs of the second rotating disc assembly comprises at least one outer tooth and at least one perforation, and the at least one outer tooth is in contact with the corresponding second roller of the second rollers, wherein the perforations of the first rotating disc assembly and the perforations of the second rotating disc assembly are aligned with each other;

at least one connecting element penetrated through the perforations of the two cycloid discs of the first rotating disc assembly and the perforations of the two cycloid discs of the second rotating disc assembly, wherein the diameters of the portions of the connecting element penetrated through the corresponding perforations are equal to each other,

wherein the diameter of the perforations of one of the two cycloid discs of the first rotating disc assembly and the diameter of the perforations of one of the two cycloid discs of the second rotating disc assembly are equal to the diameter of the connecting element, and the diameter of the perforations of the other of the two cycloid discs of the first rotating disc assembly and the diameter of the perforations of the other of the two cycloid discs of the second rotating disc assembly are greater than the diameter of the connecting element.

2. The cycloid speed reducer according to claim 1, wherein the two cycloid discs of the first rotating disc assembly comprises a first outer cycloid disc and a first inner cycloid disc, the first outer cycloid disc comprises at least one first perforation, and the first inner cycloid disc comprises at least one second perforation, wherein the two cycloid discs of the second rotating disc assembly comprises a second inner cycloid disc and a second outer cycloid disc, the second inner cycloid disc comprises at least one third perforation, and the second outer cycloid disc comprises at least one fourth perforation, wherein the diameter of the second perforation and the diameter of the third perforation are equal to the diameter of the connecting element, and the diameter of the first perforation and the diameter of the fourth perforation are greater than the diameter of the connecting element.

3. The cycloid speed reducer according to claim 1, wherein the two cycloid discs of the first rotating disc assembly comprises a first outer cycloid disc and a first inner cycloid disc, the first outer cycloid disc comprises at least one first perforation, and the first inner cycloid disc comprises at least one second perforation, wherein the two cycloid discs of the second rotating disc assembly comprises a second inner cycloid disc and a second outer cycloid disc, the second inner cycloid disc comprises at least one third perforation, and the second outer cycloid disc comprises at least one fourth perforation, wherein the diameter of the first perforation and the diameter of the fourth perforation are equal to the diameter of the connecting element, and the diameter of the second perforation and the diameter of the third perforation are greater than the diameter of the connecting element.

4. The cycloid speed reducer according to claim 1, wherein the two cycloid discs of the first rotating disc assembly comprises a first outer cycloid disc and a first inner cycloid disc, the first outer cycloid disc comprises at least one first perforation, and the first inner cycloid disc comprises at least one second perforation, wherein the two cycloid discs of the second rotating disc assembly comprises a second inner cycloid disc and a second outer cycloid disc, the second inner cycloid disc comprises at least one third perforation, and the second outer cycloid disc comprises at least one fourth perforation, wherein the diameter of the second perforation and the diameter of the fourth perforation are equal to the diameter of the connecting element, and the diameter of the first perforation and the diameter of the third perforation are greater than the diameter of the connecting element.

5. The cycloid speed reducer according to claim 1, wherein the two cycloid discs of the first rotating disc assembly comprises a first outer cycloid disc and a first inner cycloid disc, the first outer cycloid disc comprises at least one first perforation, and the first inner cycloid disc comprises at least one second perforation, wherein the two cycloid discs of the second rotating disc assembly comprises a second inner cycloid disc and a second outer cycloid disc, the second inner cycloid disc comprises at least one third perforation, and the second outer cycloid disc comprises at least one fourth perforation, wherein the diameter of the first perforation and the diameter of the third perforation are equal to the diameter of the connecting element, and the diameter of the second perforation and the diameter of the fourth perforation are greater than the diameter of the connecting element.

6. The cycloid speed reducer according to claim 1, wherein the diameter of the other of the perforations of the two cycloid discs of the first rotating disc assembly is equal to the sum of the diameter of the connecting element and four times the eccentric amount of the eccentric assembly relative to the axle center of the rotating shaft, wherein the diameter of the other of the perforations of the two cycloid discs of the second rotating disc assembly is equal to the sum of the diameter of the connecting element and four times the eccentric amount of the eccentric assembly relative to the axle center of the rotating shaft.

7. The cycloid speed reducer according to claim 1, wherein the two cycloid discs of the first rotating disc assembly have opposite eccentric directions, and the two cycloid discs of the second rotating disc assembly have opposite eccentric directions.

8. A cycloid speed reducer, comprising:

an eccentric device comprising a rotating shaft and an eccentric assembly, wherein the rotating shaft is rotatable and the eccentric assembly is eccentrically fixed on the rotating shaft and arranged between a first end and a second end of the rotating shaft, wherein the eccentric assembly is driven by the rotating shaft to eccentrically rotate relative to an axle center of the rotating shaft;

a first roller assembly comprising a first wheel disc and a plurality of first rollers, wherein the first rollers are disposed on the first wheel disc;

a second roller assembly comprising a second wheel disc and a plurality of second rollers, wherein the second rollers are disposed on the second wheel disc;

a first rotating disc assembly disposed on the eccentric assembly and rotated with the eccentric assembly, and comprising a first outer cycloid disc and a first inner cycloid disc, wherein the first outer cycloid disc and the first inner cycloid disc are arranged adjacent to each other, the first outer cycloid disc comprises at least one first outer tooth and at least one first perforation, the first inner cycloid disc comprises at least one second outer tooth and at least one second perforation, and the at least one first outer tooth and the at least one second outer tooth are in contact with the corresponding first roller of the first rollers, respectively;

a second rotating disc assembly disposed on the eccentric assembly and rotated with the eccentric assembly, and comprising a second inner cycloid disc and a second outer cycloid disc, wherein the second inner cycloid disc and the second outer cycloid disc are arranged adjacent to each other, the second inner cycloid disc comprises at least one third outer tooth and at least one third perforation, the second outer cycloid disc comprises at least one fourth outer tooth and at least one fourth perforation, and the at least one third outer tooth and the at least one fourth outer tooth are in contact with the corresponding second roller of the second rollers, respectively, wherein the at least one first perforation, the corresponding second perforation, the corresponding third perforation and the corresponding fourth perforation are aligned with each other; and

at least one connecting element penetrated through the at least one first perforation, the corresponding second perforation, the corresponding third perforation and the corresponding fourth perforation, wherein the at least one connecting element is in close contact with inner walls of the at least one first perforation, the corresponding second perforation, the corresponding third perforation and the corresponding fourth perforation,

wherein the diameter of the second perforation and the diameter of the third perforation are equal to each other, the diameter of the first perforation and the diameter of the fourth perforation are equal to each other, and the diameter of the second perforation and the diameter of the third perforation are greater than the diameter of the first perforation and the fourth perforation.

9. The cycloid speed reducer according to claim 8, wherein the connecting element comprises a first segment, a second segment and a third segment sequentially, wherein the first segment is accommodated within the corresponding first perforation, the second segment is accommodated within the corresponding second perforation and the corresponding third perforation, and the third segment is accommodated within the corresponding fourth perforation.

10. The cycloid speed reducer according to claim 9, wherein an eccentric amount is formed between an axle center of the second segment and an axle center of the first segment and the third segment.

11. The cycloid speed reducer according to claim 10, wherein an eccentric amount formed between the first outer cycloid disc and the first inner cycloid disc is equal to an eccentric amount formed between the second inner cycloid disc and the second outer cycloid disc, wherein the eccentric amount formed between the axle center of the second segment and the axle center of the first segment and the third segment is twice the eccentric amount formed between the first outer cycloid disc and the first inner cycloid disc.

12. The cycloid speed reducer according to claim 8, wherein the first outer cycloid disc and the first inner cycloid disc have opposite eccentric directions, and the second outer cycloid disc and the second inner cycloid disc have opposite eccentric directions.