The Precision Gear Components used in precision transmission systems play an important role in accurate power transmission. The input gear shaft is a key component of the first-stage planetary gear set, transferring motor torque to the internal gears. Made from 20CrMo alloy steel, it combines strength, toughness, and wear resistance for demanding transmission applications. Its integrated shaft-and-gear design supports stable engagement and helps reduce the need for separate connections, making it suitable for industrial robot joints, CNC machine tool rotary tables, and automated equipment.

1. Basic Information and Positioning

• Associated Device : The RV series precision harmonic drive reducers are widely used in applications such as industrial robots, CNC machine tool rotary tables, and servo‑driven equipment.
• Component Role : Reducer The driving input member of the first-stage planetary gear set It is directly connected to the motor’s output shaft, serving as the sun gear that drives the planetary gears, thereby achieving power splitting and preliminary speed reduction, and constituting the power source of the entire transmission chain.
• Model Association : The “24” marked on the left typically indicates the number of gear teeth. Together with the module and pressure angle, this parameter determines the speed ratio and meshing characteristics of a single-stage transmission, making it a critical parameter for matching the corresponding RV reducer model.

2. Material and Process Characteristics

• Materials ：20CrMo Alloy carburizing steel is the classic material for shaft gears operating under medium-load and medium-to-high-speed conditions.

3. Structural Features (with accompanying diagrams)

• Overall structure : Integrated shaft‑gear design, with one end featuring an involute external gear (meshing with the planetary gears, 24 teeth) and the other end serving as a journal/connection section (for coupling to the motor shaft or coupling), thereby minimizing keyway clearance issues and enhancing transmission stiffness and torque‑transmission efficiency.
• Tooth Profile Design Standard involute cylindrical gears feature uniformly distributed tooth profiles and high surface finish, meeting the multi-tooth meshing requirements of planetary gearsets. They enable even power distribution, reduce single-tooth loads, and enhance overall load-carrying capacity and fatigue life.
• Shaft body structure : The stepped shaft design features sections of varying diameters to accommodate bearings, oil seals, and other components, ensuring shaft concentricity and structural stability while meeting the internal installation space and assembly requirements of the reducer.

4. Performance and Application Value

• Core Advantages : The high-strength properties of 20CrMo material enable this gear shaft to withstand the impact loads and high‑cycle stresses typical of gear reducers; its precision‑machined gear profile and journal surfaces ensure low backlash and high transmission accuracy, meeting the stringent requirements of industrial robots for positioning and repeatability.
• Compatible Scenarios : In applications such as industrial robot joints, CNC machine tool rotary tables, automated production lines, and servo‑driven equipment—where high transmission accuracy, rigidity, and reliability are critical—RV reducers serve as the key core components that enable high reduction ratios and low backlash.