Structural Principle of Cycloidal Pinwheel Reducer

The cycloidal pinwheel reducer consists of three main parts: the input section, the reduction section, and the output section.

1. Input Section

The input shaft is connected to a 180-degree offset eccentric sleeve. The eccentric sleeve has two rocking arm roller bearings, forming an H-shaped mechanism. The center holes of the two cycloidal wheels serve as raceways for the rocking arm bearings. And the cycloidal wheels mesh with a set of needle gears arranged in a circular pattern. This forms an internal engagement reduction mechanism with a tooth difference of one tooth. To reduce friction, needle gears in low reduction ratio reducers are often equipped with needle sleeves.

2. Reduction Section

The reduction section is the core part of the cycloidal pinwheel reducer. Consisting of two cycloidal wheels, a pin gear, and a set of needle gears arranged in a ring.

• Cycloidal Wheel and Pin Gear Meshing: The cycloidal wheels have a specially designed tooth profile that allows them to undergo both rotation (orbit) and self-rotation under the constraint of the pin gears. Each tooth of the cycloidal wheel meshes with a needle on the pin gear, reducing speed by one tooth per revolution.
• Internal Engagement Structure: The internal engagement between the cycloidal wheel and the pin gear reduces friction and increases transmission efficiency. In reducers with low reduction ratios, the needle gears are often fitted with needle sleeves to minimize friction.

3. Output Section

The output section transmits the low-speed self-rotation of the cycloidal wheel to the output shaft through a W-type output mechanism.

• Low-Speed Self-Rotation: When the input shaft rotates the eccentric sleeve, it drives the cycloidal wheels. Due to the constraint of the pin gears, the cycloidal wheels perform a combined orbital and self-rotational motion. After a complete revolution, the low-speed motion of the cycloidal wheel is transmitted to the output shaft through the output section, resulting in a reduced output speed.

Operating Process:

1. Input Shaft Rotation: The input shaft drives the eccentric sleeve, and the offset design causes the rocking arm bearings to move the cycloidal wheel.
2. Cycloidal Wheel Movement: The cycloidal wheel performs both orbital and self-rotation. Due to the special tooth profile, it meshes with the needle gears, achieving speed reduction.
3. Low-Speed Output: After completing the rotational cycle, the low-speed self-rotation of the cycloidal wheel is transmitted via the W-type output mechanism to the output shaft, achieving the desired speed reduction.

Advantages of the Structure:

• High Load Capacity: The internal engagement structure and multiple tooth contacts allow the cycloidal pinwheel reducer to handle higher loads effectively.
• High Efficiency: Compared to other types of reducers, the cycloidal pinwheel reducer has high transmission efficiency, making it ideal for high-load and large reduction ratio applications.
• Compact Size: Due to the unique structure of the cycloidal wheels, the reducer has a smaller footprint, making it suitable for space-constrained applications.

Applications:

Cycloidal pinwheel reducers are widely used in industries. Such as metallurgy, mining, textiles, lifting, and environmental protection, particularly in applications that require large reduction ratios and high load capacities.

The design and transmission mechanism of this reducer make it an ideal choice in many high-demand applications.