







Introduction to Cycloid Pin Gear Reducer
The cycloid pin gear reducer, fully known as cycloid pin gear speed reducer, is a novel transmission device that applies the principle of planetary transmission and uses cycloid pin gear meshing. It is widely used in industrial fields.
Structural Composition
The entire transmission device is divided into three parts: input, deceleration, and output.
- The input shaft is equipped with a double eccentric sleeve offset by 180°, on which a roller bearing forms an H mechanism.
- The central holes of the two cycloid gears serve as the raceways for the arm bearings on the eccentric sleeve. The cycloid gears mesh with the circularly arranged pin teeth on the pin gear, forming an internal meshing reduction mechanism with a tooth difference of one (in reducers with small speed ratios, pin teeth are equipped with pin gear sleeves to reduce friction).
Working Principle
When the input shaft rotates once with the eccentric sleeve, the cycloid gear undergoes a planar motion of both revolution and rotation due to the characteristics of its tooth profile curve and the limitation of the pin teeth.
- For each full rotation of the input shaft, the eccentric sleeve rotates once, and the cycloid gear rotates backward by one tooth, achieving deceleration.
- The low-speed rotational motion of the cycloid gear is then transmitted to the output shaft via the W output mechanism through pins, resulting in a lower output speed.
Performance Characteristics
- High Speed Ratio and Efficiency: Single-stage transmission can achieve a speed ratio of 1:87 with an efficiency of over 90%. Larger speed ratios are possible in multi-stage transmissions.
- Compact Structure and Small Size: The use of planetary transmission principles aligns the input and output shafts on the same axis, minimizing the machine's dimensions.
- Smooth Operation and Low Noise: The large number of meshing teeth, high overlap coefficient, and balanced mechanism limit vibration and noise to a minimum.
- Reliable and Long Service Life: Main components are made of high-carbon chromium steel, quenched to obtain high strength (HRC58-62), with part of the transmission contact using rolling friction for durability.
Common Models
Common models include:
- B Series: e.g., BW foot-mounted horizontal double-shaft cycloid pin gear reducers, BL flange-mounted vertical double-shaft cycloid pin gear reducers.
- X Series: e.g., XW foot-mounted horizontal double-shaft cycloid pin gear reducers, XL flange-mounted vertical double-shaft cycloid pin gear reducers.
- Other series: 8000 series, F8000 series, Z series, 9000 series, and Taiwan Transcyko 600 series.
Application Fields
Widely used in industries such as petroleum, environmental protection, chemical engineering, cement, conveying, textiles, pharmaceuticals, food, printing, lifting, mining, metallurgy, construction, and power generation as driving or deceleration devices. It also applies to emerging fields like industrial robots and new energy equipment manufacturing. For example, in the wrist joint of a six-axis collaborative robot, the precise transmission of an RV reducer (an advanced form of cycloid pin gear reducer) achieves a positioning accuracy of ±0.01mm and a repeat positioning error of no more than 0.005mm.