Planetary Gear Shaft

Understanding the Planetary Gear Shaft

The planetary gear shaft, often called the sun shaft, is the central gear in a planetary gear set. It meshes with multiple surrounding planet gears, which are in turn housed within an outer ring gear. This compact arrangement allows for high torque density and efficient power transfer. Our planetary gear shafts are manufactured from the highest grade alloys, undergo specialized heat treatment (such as carburizing or nitriding), and are precision ground to achieve the exact tooth profile, surface hardness, and micro-geometry required for smooth, quiet, and powerful operation.

Technical Features & Manufacturing Quality:

• Premium Material Selection: Fabricated from case-hardening steels like 20MnCr5, 4140, or 9310, chosen for their excellent core toughness and wear-resistant surface properties.

• Advanced Heat Treatment: Precisely controlled carburizing, hardening, and tempering processes achieve optimal surface hardness (60-64 HRC) while maintaining a ductile core to prevent fracture under high-stress conditions.

• Ultra-Precision Machining: State-of-the-art CNC grinding and honing ensure exact tooth geometry, superior surface finish (Ra < 0.8μm), and strict adherence to AGMA and DIN quality standards for minimal noise and vibration.

• Full Dimensional Compliance: Every shaft is certified to match OEM blueprints for spline dimensions, lengths, diameters, and concentricity, guaranteeing a perfect fit and reliable performance.

Key Industries and Applications:

Our planetary gear shafts are integral components in systems requiring high reduction ratios and torque in a compact space:

• Automotive: Automatic transmissions, hybrid vehicle drivetrains, and torque converter assemblies.

• Industrial Machinery: High-performance gearboxes for robotics, wind turbines, mining equipment, and heavy-duty construction machinery.

• Aerospace: Flight control systems, helicopter transmissions, and engine accessories.

• Agriculture: Final drives in tractors, combines, and other agricultural equipment.

Common Indicators for Replacement:

• Increased noise levels (whining, grinding) from the gearbox during operation.

• Vibration felt through the machine or vehicle.

• Difficulty shifting gears or noticeable loss of power transmission efficiency.

• Metal debris present in the gearbox oil (indicating advanced wear or pitting on the gear teeth).

Why Partner With Us for Your Planetary Gear Shaft Needs?

• Technical Collaboration: Our engineering team can provide support for material selection, design review, and custom manufacturing to meet your specific performance criteria.

• Stringent Quality Assurance: We provide full traceability and certification (including material certs and hardness reports) to ensure compliance with your most rigorous standards.

• Global Supply Chain: We support OEMs and MRO operations worldwide with reliable, just-in-time delivery to minimize production or repair downtime.

• Cost-Effective Solutions: We offer alternatives that provide the durability and performance of genuine parts at a more competitive total cost of ownership.