Speed reducer

Patent metadata

Field	Value
Publication number	US-12359711-B2
Application number	US-202418958230-A
Country	US
Kind code	B2
Filing date	Nov 25, 2024
Priority date	Nov 7, 2018
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.

First claim

What is claimed is:

1. A speed reducer, comprising:
a transmission shaft having a first end and a second end;
an eccentric wheel eccentrically fixed on the second end of the transmission shaft, wherein the eccentric wheel is driven by the transmission shaft to eccentrically rotate relative to an axle center of the transmission shaft;
a first wheel assembly comprising a first wheel disc and at least one first roller, wherein the first wheel disc is disposed between the first end and the second end of the transmission shaft and comprises a first annular body, wherein the first annular body is extended from the first wheel disc in a direction away from the first end of the transmission shaft, the first annular body has an inner wall, and the at least one first roller is disposed on the inner wall;
a rotating wheel comprising a main body and an axle hole, wherein the eccentric wheel is disposed within the axle hole, the rotating wheel is rotated with the eccentric wheel, and the main body comprises an outer ring structure and a concave structure, wherein the outer ring structure is disposed on an outer periphery of the main body and comprises at least one first tooth, the at least one first tooth is in contact with the corresponding first roller, and at least one second roller is disposed within the concave structure; and
a second wheel assembly comprising a second wheel disc and at least one second tooth, wherein the second wheel disc comprises a second annular body, and the second annular body is extended from the second wheel disc in a direction toward the first end of the transmission shaft, wherein the at least one second tooth is disposed on an outer periphery of the second annular body, and each of the at least one second tooth is in contact with the corresponding second roller;
wherein when the at least one second roller and the corresponding second tooth are pushed against each other to result in rotation of the second wheel assembly, the first wheel assembly is not rotated, or wherein when the at least one first roller and the corresponding first tooth are pushed against each other to result in rotation of the first wheel assembly, the second wheel assembly is not rotated;
wherein the number of the at least one first roller is one greater than the number of the at least one first tooth, and the number of the at least one second tooth is one greater than the number of the at least one second roller.

2. The speed reducer according to claim 1 , wherein when the first wheel assembly is not rotated but the second wheel assembly is rotated, a reduction ratio of the speed reducer is equal to (M×N)/{M×N−(M+1)×(N−1)}, wherein M is the number of the at least one first tooth, N is the number of the at least one second tooth, and M and N are integers greater than 1, wherein the second wheel assembly is a power output end.

3. The speed reducer according to claim 1 , wherein when the first wheel assembly is rotated but the second wheel assembly is not rotated, a reduction ratio of the speed reducer is equal to {(M+1)×(N−1)}/{(M+1)×(N−1)−(M×N)}, wherein M is the number of the at least one first tooth, N is the number of the at least one second tooth, and M and N are integers greater than 1, wherein the first wheel assembly is a power output end.

4. A speed reducer, comprising:
a transmission shaft having a first end and a second end;
an eccentric wheel eccentrically fixed on the second end of the transmission shaft, wherein the eccentric wheel is driven by the transmission shaft to eccentrically rotate relative to an axle center of the transmission shaft;
a first wheel assembly comprising a first wheel disc and at least one first roller, wherein the first wheel disc is disposed between the first end and the second end of the transmission shaft and comprises a first annular body, wherein the first annular body is extended from the first wheel disc in a direction away from the first end of the transmission shaft, the first annular body has an inner wall, and the at least one first roller is disposed on the inner wall;
a rotating wheel comprising a main body and an axle hole, wherein the eccentric wheel is disposed within the axle hole, the rotating wheel is rotated with the eccentric wheel, and the main body comprises an outer ring structure and a concave structure, wherein the outer ring structure is disposed on an outer periphery of the main body and comprises at least one first tooth, the at least one first tooth is in contact with the corresponding first roller, and at least one second roller is disposed within the concave structure; and
a second wheel assembly comprising a second wheel disc and at least one second tooth, wherein the second wheel disc comprises a second annular body, and the second annular body is extended from the second wheel disc in a direction toward the first end of the transmission shaft, wherein the at least one second tooth is disposed on an outer periphery of the second annular body, and each of the at least one second tooth is in contact with the corresponding second roller;
wherein when the at least one second roller and the corresponding second tooth are pushed against each other to result in rotation of the second wheel assembly, the first wheel assembly is not rotated,
wherein the number of the at least one first roller is one greater than the number of the at least one first tooth, and the number of the at least one second tooth is one greater than the number of the at least one second roller.

5. The speed reducer according to claim 4 , wherein when the first wheel assembly is not rotated but the second wheel assembly is rotated, a reduction ratio of the speed reducer is equal to (M×N)/{M×N−(M+1)×(N−1)}, wherein M is the number of the at least one first tooth, N is the number of the at least one second tooth, and M and N are integers greater than 1, wherein the second wheel assembly is a power output end.

6. A speed reducer, comprising:
a transmission shaft having a first end and a second end;
an eccentric wheel eccentrically fixed on the second end of the transmission shaft, wherein the eccentric wheel is driven by the transmission shaft to eccentrically rotate relative to an axle center of the transmission shaft;
a first wheel assembly comprising a first wheel disc and at least one first roller, wherein the first wheel disc is disposed between the first end and the second end of the transmission shaft and comprises a first annular body, wherein the first annular body is extended from the first wheel disc in a direction away from the first end of the transmission shaft, the first annular body has an inner wall, and the at least one first roller is disposed on the inner wall;
a rotating wheel comprising a main body and an axle hole, wherein the eccentric wheel is disposed within the axle hole, the rotating wheel is rotated with the eccentric wheel, and the main body comprises an outer ring structure and a concave structure, wherein the outer ring structure is disposed on an outer periphery of the main body and comprises at least one first tooth, the at least one first tooth is in contact with the corresponding first roller, and at least one second roller is disposed within the concave structure; and
a second wheel assembly comprising a second wheel disc and at least one second tooth, wherein the second wheel disc comprises a second annular body, and the second annular body is extended from the second wheel disc in a direction toward the first end of the transmission shaft, wherein the at least one second tooth is disposed on an outer periphery of the second annular body, and each of the at least one second tooth is in contact with the corresponding second roller;
wherein when the at least one first roller and the corresponding first tooth are pushed against each other

Assignees

• Delta Electronics Inc

Inventors

• Chung Chi-Wen
• Chu en-yi
• Lin Hung-Wei
• Tsao Ming-Li

Classifications

• F16H21/18

  Crank gearings; Eccentric gearings · CPC title

• F16H2057/02073

  Reduction gearboxes for industry · CPC title

• H02K7/075

  using crankshafts or eccentrics · CPC title

• F16H2049/003

  Features of the flexsplines therefor · CPC title

• H02K15/165

  Balancing the rotors · CPC title