Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
Star gear pinion
This component is made of 20CrMnMo alloy steel and serves as the core driving element of the first-stage planetary gear set in an RV reducer. It meshes with the planet gears to transmit power and provide initial speed reduction, exhibiting high strength, excellent wear resistance, and superior impact resistance, making it well-suited for precision drive applications in industrial robots and automated equipment.
- Product Description
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1. Basic Information and Positioning
- Associated Device The RV50C series precision harmonic reducers are compact, high-rigidity gearboxes commonly used in industrial robot joints and small-scale automation equipment.
- Component Role : As a reducer The driving gear (sun gear) of the first-stage planetary gear set It is directly connected to the input shaft, driving the planetary gears to revolve around the internal ring gear, thereby achieving power splitting and preliminary speed reduction, and serving as the primary power‑source component of the entire transmission train.
- Model Association “50C” is a gearbox model designation, corresponding to the 50‑size unit in the RV‑C series. This series emphasizes compact, lightweight design and is well suited for medium‑ and small‑load applications.
2. Material and Process Characteristics
- Materials ：20CrMnMo High-strength carburizing alloy steel is the preferred material for gears operating under heavy-load, high-impact conditions.
- Heat treatment process: carburizing and quenching followed by low-temperature tempering; the tooth surface hardness can reach HRC58-62 Its core exhibits excellent toughness, while also offering high wear resistance, superior contact fatigue strength, and outstanding impact resistance, making it well-suited to meet the demanding operational requirements of gear reducers subjected to heavy loads and frequent start–stop cycles.
- Manufacturing Advantages: High-precision gear profiles can be achieved through hobbing and grinding processes, resulting in exceptionally smooth tooth surfaces, smooth meshing, and low noise. This approach effectively controls transmission backlash, ensuring the precision and stability of the reducer.
3. Structural Features
- External structure : A cylindrical gear component with an involute external tooth on one end (meshing with the planetary gear) and a shaft–bore configuration on the other end (for connection to the input shaft or motor shaft to transmit torque), representing a typical integrated shaft‑gear design.
- Tooth Design : The teeth are evenly distributed, and their surfaces are precision‑machined to meet the multi‑tooth meshing requirements of planetary gear drives, enabling uniform power distribution, reducing the load on individual teeth, and enhancing overall load capacity and fatigue life.
- Overall process : The integrally forged shaft‑gear structure reduces assembly steps, eliminates clearance issues associated with key connections, and enhances transmission stiffness and torque‑transmission efficiency, making it a typical design for the sun gear of RV reducers.
4. Performance and Application Value
- Core Advantages The high-strength properties of 20CrMnMo material enable this gear to withstand the impact loads and high cyclic stresses typical of gearboxes, while its precision‑machined tooth profile ensures low backlash, meeting the stringent requirements of industrial robots for positioning accuracy and repeatability.
- Compatible Scenarios : In applications such as industrial robot joints, CNC machine tool rotary tables, automated production lines, and servo drive systems—where high transmission accuracy, rigidity, and reliability are critical—RV reducers serve as the key core components enabling high reduction ratios and precision motion control.
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