1. Basic Information and Positioning

• Compatible Scenarios : Planetary gear reducers for ships and cruise vessels (for propulsion systems, deck machinery, etc.), designed for power transmission in marine environments.
• Component Role The core driven component of a planetary gearbox—the internal gear ring or sun gear ring—meshes with the planet gears to achieve speed reduction, torque multiplication, and power transmission. It is a critical part in marine propulsion systems, directly influencing the gearbox’s transmission efficiency, load-carrying capacity, and operational reliability.
• Design Positioning : Specifically designed for heavy-load operating conditions on ships, it must withstand high torque, cyclic loads, and impact while meeting stringent requirements for corrosion resistance and reliability in marine environments.

2. Material and Process Characteristics

• Materials ： 20CrMnTi low-carbon alloy carburizing steel , is a classic material for heavy-duty gear components.

3. Structural Features

• Overall structure : The annular internal gear ring features an internal ring densely populated with evenly spaced involute internal teeth, while the external ring is equipped with a flange mounting surface and bolt holes, representing a typical internal gear ring configuration for planetary gear reducers.
• Tooth Design The inner ring features an involute internal gear profile that meshes with the planetary gears, enabling speed reduction, torque multiplication, and power transmission. Its gear parameters are directly matched to the reducer’s gear ratio and load-carrying capacity, ensuring reliable high-torque transmission.
• Installation Structure The outer flange features multiple evenly spaced bolt holes for secure attachment to the reducer housing. The flange surface is precision‑machined to ensure coaxial alignment with the housing, thereby minimizing vibration and axial movement during high‑speed operation. The outer ring may be blackened or coated to enhance corrosion resistance, making it suitable for marine environments.

4. Performance and Application Value

• Core Advantages : The 20CrMnTi material and carburizing‑quenching process enable this gear ring to withstand the high torque, cyclic loads, and impact forces of marine gearboxes, while resisting wear, pitting, and fracture. Precision‑machined tooth profiles and mounting surfaces ensure low noise and high‑efficiency operation, enhancing the reliability and stability of the ship’s propulsion system.
• Compatible Scenarios : Planetary gear reducers for ship and cruise‑ship propulsion systems, deck machinery gearboxes, and hoisting equipment gearboxes are critical core components that ensure the stable operation of a vessel’s main and auxiliary drive systems.