Planetary Reduction Drive is a mechanical transmission system based on a planetary gear mechanism that achieves speed reduction and torque amplification. It is widely used in industrial equipment that requires high precision and high torque output. Planetary Reduction Drive converts high-speed low torque input power into low-speed high torque output power through the meshing motion of planetary gear components, while maintaining the characteristics of compact structure and efficient transmission. Planetary Reduction Drive is a mechanical transmission based on a planetary gear system, mainly used to reduce input speed and increase output torque. Its core features include coaxial input and output, high power density, and multi-stage deceleration capability
Planetary Reduction Drive achieves a perfect combination of high reduction ratio, high torque output, and compact structure through load splitting and coaxial transmission of the planetary gear system, making it the preferred solution in the high-end transmission field. Despite its high design and manufacturing costs, it has irreplaceable advantages in scenarios such as robotics, industrial automation, new energy vehicles, aerospace, and robotics that require strict performance and space requirements.
The operation of Planetary Reduction Drive is based on the compound motion of "rotation+revolution" of planetary gears, and the principle of deceleration and torque increase can be understood through the following process:
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Power transmission path |
Power is transmitted from the input shaft to the sun gear, which rotates to drive the surrounding planetary gears to rotate around its own axis; At the same time, due to the meshing between the planetary gear and the fixed internal gear ring, the reaction force of the internal gear ring pushes the planetary gear to revolve around the sun gear along with the planetary carrier; Ultimately, the orbital motion of the planetary carrier is transmitted to the load through the output shaft. |
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Transmission ratio calculation |
The reduction ratio (the ratio of input speed to output speed) is determined by the number of teeth on the sun gear and inner ring gear. When the inner ring gear is fixed, the sun gear is input, and the planetary carrier is output, the formula is: Reduction ratio=1+(number of inner ring gear teeth/number of sun gear teeth) For example, if the number of teeth on the sun gear is 20 and the number of teeth on the inner ring gear is 80, then the reduction ratio is 1+(80/20)=5, which means that for every 5 revolutions of input speed, the output shaft rotates 1 revolution. |
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Relationship between torque and speed |
According to the law of conservation of energy, ignoring losses, the input power (speed x torque) is approximately equal to the output power. Therefore, during the deceleration process, while the speed decreases, the torque will be proportionally amplified according to the reduction ratio (the actual output torque needs to consider the transmission efficiency, usually a single-stage efficiency of 95% -98%). |
Here In this page, we introduce our PET serial Planetary Gear Reducers, you will see ranges,finished gearboxes,videos of test as follows:
Also You are welcome to watch more projects or visit our video gallery by Youtube: https://www.youtube.com/@tallmanrobotics
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Helical Gear Series:PET |
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Planetary Reduction Drive is an efficient reduction device with planetary gear components as its core, which achieves "reduction and torque increase" through the coordinated motion of the sun gear, planet gear, planet carrier, and internal gear ring. It has the advantages of compact structure, high power density, high efficiency, and smooth operation.
From industrial robots to new energy equipment, from precision instruments to heavy machinery, Planetary Reduction Drive is a key equipment for achieving power conversion and precise control in modern mechanical engineering. Its performance directly affects the efficiency, accuracy, and reliability of the entire mechanical system. With the development of industrial intelligence, the demand for high precision, high reliability, and lightweight of Planetary Reduction Drive will continue to drive their technological innovation.
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