Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
Planetary gear
This is a planetary gear set for RV reducers, made from 20CrMoH alloy structural steel. It is specifically designed for high-precision transmission applications such as industrial robot joints, offering high load capacity, excellent wear resistance, low backlash, and long service life. As a core component, it enables RV reducers to achieve large reduction ratios and high‑precision motion control.
- Product Description
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1. Basic Information and Positioning
- Compatible Scenarios : Industrial robot joints, automation equipment, precision machine tools, and more are used in RV‑E series harmonic drive reducers.
- Component Role : The core transmission components of an RV reducer, working in conjunction with the cycloidal gear and the crankshaft, achieve speed reduction and torque multiplication while transmitting torque, directly influencing the reducer’s load-carrying capacity, transmission accuracy, and operational reliability.
- Design Positioning : Specifically designed for heavy-load, high-precision applications, it must withstand high torque, cyclic loads, and impact while meeting stringent requirements for low backlash and high efficiency.
2. Material and Process Characteristics
- Materials ： 20CrMoH alloy structural steel , is the preferred material for heavy-duty gears.
- Heat treatment process: Employed Carburizing and quenching + low-temperature tempering Treatment, with a tooth surface hardness that can reach HRC58-63 The core maintains high toughness while exhibiting excellent wear resistance, contact fatigue strength, and impact resistance, making it well-suited to the demanding operating conditions of RV reducers under high torque and cyclic loading.
- Manufacturing process: The gear teeth are machined using high-precision hobbing or shaping combined with grinding, achieving a gear accuracy of 6–7 grades. The internal spline and mounting holes are precision‑machined to ensure tight fit with the crankshaft, effectively minimizing transmission backlash and enhancing both the efficiency and operational stability of the reducer.
3. Structural Features and Functional Analysis
Structural Type Structural features Core Features Standard planetary gear
Disc-shaped external gear design: the outer ring features involute straight teeth, while the inner ring is equipped with a spline bore. It meshes with the central sun gear to achieve speed reduction and torque multiplication; its splined bore mates with the crankshaft to transmit torque. Flanged planetary gear
The outer ring features involute straight teeth, while the inner ring is equipped with a flange and bolt holes. Enhances installation stability, allows direct connection to the cycloidal wheel or other components, and improves transmission rigidity. Planetary gear with locating holes
Outer ring with involute straight teeth; inner ring with locating holes / pin holes. Achieve circumferential positioning to prevent displacement during transmission and ensure transmission accuracy. 4. Performance and Application Value
- Core Advantages ：
- High load-bearing and high wear resistance : Made of 20CrMoH steel and subjected to carburizing and quenching, this material can withstand the high torque output of RV reducers, with tooth surfaces that are resistant to wear and pitting, ensuring a long service life.
- High precision, low backlash : Precision gear machining and mating processes ensure minimal backlash and high positioning accuracy, meeting the stringent precision‑control requirements of industrial robot joints.
- High efficiency, low noise : Involute straight-tooth gears offer smooth meshing; when paired with gear grinding, they achieve reduced tooth surface roughness, high transmission efficiency, and low operating noise.
- Compatible Scenarios : Various industrial robot joints, automated production lines, precision machine tools, medical devices, and more are critical core components that enable RV reducers to deliver high-precision, highly reliable motion transmission.
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