Speed reducer

Abstract

This invention discloses a speed reducer. The speed reducer includes an eccentric structure, an output wheel structure, and a fixed wheel structure. The eccentric structure includes a cycloidal wheel, which includes a first gear and a second gear connected to the first gear. The first gear has a greater number of teeth than the second gear. The output wheel structure includes a third gear sleeved around the second gear, and the third gear has a greater number of teeth than the second gear. The fixed wheel structure includes a fourth gear sleeved around the first gear, and the fourth gear has a greater number of teeth than the first gear.

Claims

1. A speed reducer, comprising: An eccentric structure includes a cycloidal wheel, the cycloidal wheel including a first gear and a second gear connected to the first gear, the number of teeth of the first gear being greater than the number of teeth of the second gear; an output wheel structure including a third gear sleeved around the second gear, the number of teeth of the third gear being greater than the number of teeth of the second gear; and a fixed wheel structure including a fourth gear sleeved around the first gear, the number of teeth of the fourth gear being greater than the number of teeth of the first gear.

2. The speed reducer as claimed in claim 1, wherein the cycloidal wheel has a first outer peripheral surface and a second outer peripheral surface, the outer edge of the first gear is the first outer peripheral surface, and the outer edge of the second gear is the second outer peripheral surface.

3. The speed reducer as claimed in claim 1, wherein the output wheel structure has a first inner circumferential surface, and the inner edge of the third gear is the first inner circumferential surface.

4. The speed reducer as claimed in claim 1, wherein the fixed wheel structure has a second inner circumferential surface, and the inner edge of the fourth gear is the second inner circumferential surface.

5. The speed reducer as claimed in claim 1, wherein the number of teeth of the third gear is less than or equal to the number of teeth of the first gear; and the number of teeth of the fourth gear is greater than the number of teeth of the third gear.

6. The speed reducer as claimed in claim 1, adapted for use with a motor including a rotor; wherein, The eccentric structure further includes an eccentric body, which is connected to the cycloidal wheel and the rotor respectively.

7. The speed reducer as claimed in claim 6, wherein the cycloidal wheel is fitted onto the side of the eccentric body adjacent to the output wheel structure.

8. The speed reducer as claimed in claim 6, wherein the eccentric body has two shafts in different positions.

9. The speed reducer as claimed in claim 1, adapted for use with a motor including a rotor; wherein, When the rotor drives the eccentric structure to rotate, in one cross-sectional direction, the first gear rotates and oscillates between the third gear and the fourth gear, and the second gear rotates and oscillates inside the third gear.

10. The speed reducer as claimed in claim 1, wherein when the eccentric structure rotates, a portion of the first gear engages the fourth gear, while a portion of the second gear engages the third gear.

11. The speed reducer as claimed in claim 1, adapted for use with a motor including a rotor; wherein, The output wheel structure is sleeved around an output shaft, and the rotor rotates in the same direction as the third gear and the output shaft.

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