A planetary ring gear, also known as an internal ring gear, is a key component in planetary gear systems, featuring teeth cut on the inner surface of a cylindrical ring. It meshes with multiple planet gears that orbit a central sun gear, enabling compact, high-torque power transmission with excellent efficiency. Typically designed with an involute tooth profile, it ensures smooth operation and uniform load distribution, while its large diameter and internal orientation allow for high gear reduction ratios within a confined space. This makes it widely used in applications like automotive transmissions, industrial machinery, and aerospace systems.
Specification
| Model Number | M3,M4,M5,M8,M12 and etc. |
| Material | Brass, C45 steel, Stainless steel, Copper, POM, Aluminum, Alloy, and so on |
| Surface treatment | Zinc-plated, Nickel plated, Passivation, Oxidation, Anodization, |
| Geomet, Dacromet, Black Oxide, Phosphatizing, Powder Coating, and Electrophoresis | |
| Standard | ISO, DIN, ANSI, JIS, BS, and Non-standard. |
| Precision | DIN6,DIN7,DIN8,DIN9. |
| Teeth treatment | Hardened, Milled, or Ground |
| Tolerance | 0.001mm-0.01mm-0.1mm |
| Finish | shot/sandblast, heat treatment, annealing, tempering, polishing, anodizing, zinc-plated |
| Items packing | Plastic bag+Cartons Or Wooden Packing |
| Payment terms | T/T, L/C |
| Production lead time | 20 business days for sample,25 days for the bulk |
| Samples | Sample price range from $2 to $100. |
| sample express request paid by clients | |
| Application | 1. Automatic controlling machine |
| 2. Semi-conductor industry | |
| 3. General industry machinery | |
| 4. Medical equipment | |
| 5. Solar energy equipment | |
| 6. Machine tool | |
| 7. Parking system | |
| 8. High-speed rail and aviation transportation equipment, etc. |
Features of Planetary Ring Gear
A planetary ring gear is characterized by its internal tooth configuration, cut on the inner surface of a cylindrical ring, which distinguishes it from external gears. It typically employs an involute tooth profile, ensuring smooth and efficient meshing with planet gears that rotate around a central sun gear. This design facilitates a constant velocity ratio and excellent load distribution, contributing to reliable power transmission in compact setups.
The gear’s large diameter and internal orientation enable high gear reduction ratios, making it a vital component in planetary gear systems where space is limited and high torque is required. Its ability to rotate in the same direction as the planet gears enhances system simplicity, while the concave tooth shape can improve contact strength and durability. These features make it ideal for demanding applications such as automotive transmissions and heavy machinery.
Manufacturing a planetary ring gear often involves gear shaping due to its internal geometry, requiring precision to avoid interference issues like involute or trochoid interference with mating gears. A profile shift is commonly applied to strengthen teeth and prevent meshing problems, ensuring robustness. Its versatility and efficiency have made it a cornerstone in industries like aerospace, robotics, and industrial automation.
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