The principle of a planetary roller screw is similar to that of a planetary reducer. From a high-speed power source like a motor or engine to the working end of the device, there must be a process of deceleration and torque amplification—this is what the transmission mechanism achieves.
Small rollers revolve and rotate around the main screw, just like planetary bodies orbiting in space.
Planetary Roller Screws are widely used in industrial automation, CNC machine tools, aerospace, and automotive manufacturing.
In the upstream supply chain, screw shafts are typically made from alloy structural steel, while nuts and rollers are made from high-carbon chromium bearing steel. Key components include the screw shaft and the nut.
Internationally, planetary roller screws mainly use alloy structural steel, with nuts and rollers made of fully hardened 100Cr6 bearing steel, costing over 5,000 RMB per ton.
In China, martensitic stainless steel and austenitic stainless steel are the main materials, with prices exceeding 10,000 RMB per ton.
Key features of planetary roller screws include high transmission efficiency, precise positioning, strong load capacity, and long service life, making them indispensable in modern mechanical transmissions.