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Cycloidal pinwheel reducer 03

An offset double-eccentric sleeve, rotated by 180°, is mounted on the input shaft. Two roller bearings are installed on this eccentric sleeve, forming an H‑type mechanism. The central holes of the two cycloidal gears serve as raceways for the swivel‑arm bearings of the eccentric sleeve, while a set of needle gears arranged in a ring on the cycloidal gears meshes with these sleeves, thereby constituting a low‑tooth‑difference internal‑meshing reduction mechanism.

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Pipe fittings / Valves / Vessel-mounted accessories

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Product Description

1. Product Overview
The planetary cycloidal pinwheel reducer’s entire transmission system can be divided into three sections: the input section, the reduction section, and the output section. An eccentric sleeve with a 180° phase shift is mounted on the input shaft, and two roller bearings are installed on this sleeve, forming an H‑type mechanism. The central holes of the two cycloidal gears serve as raceways for the swing-arm bearings on the eccentric sleeve, while the cycloidal gears mesh with a set of needle gears arranged in a ring on the needle gear wheel, thereby constituting a small‑tooth‑difference internal‑meshing reduction mechanism. (To reduce friction, in reducers with low speed ratios, the needle teeth are fitted with needle‑tooth sleeves.)
When the input shaft drives the eccentric sleeve to rotate through one full revolution, the cycloidal gear’s motion—due to the characteristic profile of its toothed cam and the constraint imposed by the needle teeth of the needle gear—becomes a planar motion involving both orbital and rotational components. As the input shaft completes one revolution in the forward direction, the eccentric sleeve also rotates one full turn, while the cycloidal gear turns in the opposite direction by one tooth pitch, thereby achieving speed reduction. Subsequently, via the W output mechanism, the low-speed rotational motion of the cycloidal gear is transmitted to the output shaft through a pin shaft, yielding a reduced output rotational speed.

2. Product Features
1. High speed ratio and high efficiency
A single-stage transmission can achieve a reduction ratio of 1:87 with an efficiency exceeding 90%; using a multi-stage design yields an even higher reduction ratio.

2. Compact structure and small size
Thanks to the use of planetary gear principles, the input and output shafts share the same axis, resulting in a compact structure and small footprint.

3. Smooth operation with low noise
The cycloidal pin gear features a large number of meshing teeth, a high overlap ratio, and a mechanism that ensures smooth operation, thereby minimizing vibration and noise.

4. Reliable and long-lasting use
Because the key components are manufactured using bearing steel, they exhibit excellent mechanical properties; coupled with rolling friction, they deliver long-lasting durability and a extended service life.

5. It features strong overload capacity, excellent shock resistance, and a small moment of inertia, making it suitable for applications involving frequent starts and reversible operation.