Precision Sun Gear
The sun gear serves as the core driving component of a planetary gear system. It transmits torque and meshes with the planetary gears, determining the overall transmission efficiency and load-bearing capacity of the entire drivetrain.
Enstark is one of the most reliable manufacturers and suppliers of precision sun gears in China. With abundant experience, we warmly welcome you to wholesale advanced precision sun gears made in China from our factory. Good service and quality products are available.
How the Precision Sun Gear Works
A sun gear is the central gear in a planetary gear system. It is named this way because the planet gears revolve around it like planets around the sun.
The most important function of a sun gear is power input and torque transmission. It meshes with the surrounding planet gears to transmit power to the entire transmission system, achieving speed reduction, torque increase, and direction change. The performance of the sun gear directly determines the efficiency, noise, and service life of the gearbox.
Key Specifications
Why Machine Builders Specify It
Six reasons our precision sun gears perform reliably in demanding drivetrains.
High Torque Capacity
High torque transmission capacity, suitable for heavy-duty working conditions.
High Transmission Efficiency
High transmission efficiency, up to 96% or more.
Low Noise, Low Vibration
Low noise and low vibration for stable operation.
Compact Structure
Compact structure that saves installation space.
Wear Resistance
Strong wear resistance and a long service life.
Custom Design
Custom size, tooth shape, and connection structure supported.
Sun Gear Specifications
Precision Sun Gear Technical Data
Precision Sun Gear Specifications
Enstark supports precision gear manufacturing in various materials. Along with stainless steel gears, carbon steel gears, and other metal gears, we also manufacture plastic gears, commonly custom PTFE + carbon fiber gears and custom nylon gears. The gear accuracy we can achieve is ISO/DIN/GB Level 5.
| Design Parameter | Module & Teeth Specification | Custom Machining Capability |
|---|---|---|
| Specifications | Module range: 0.1 to 5.0, with a customizable number of teeth. | Outer diameter, inner bore, keyway, length, and flange structure can be customized per drawings. Shaft-integrated finished parts are available for diverse assembly requirements. |
| Precision Grade | The precision of our sun gear can reach ISO Grade 5, with small backlash and stable transmission. | It is suitable for high-precision transmission equipment such as industrial robots, precision reducers, and medical machinery. |
| Design Considerations | Design factors include module, number of teeth, pressure angle, helix angle, face width, precision grade, and material. | Bending strength and contact strength must be calculated based on actual load to prevent failure. Lubrication, heat dissipation, and assembly accuracy are also key performance factors. |
Six mounting orientations
The same frame can be bolted base-down, wall mounted or inverted, and the motor can sit above, behind or in line. Quote the code with your order so the unit ships with the oil level and breather set for that orientation.
Base down, output up
Standard dial-table orientation.
Base down, output side
Right-angle output for wheel drives.
Wall mount, output horizontal
Saves floor space on narrow frames.
Inverted, output down
Overhead carrier and gantry work.
Motor top-mounted
Gearmotor stacked over the housing.
Motor rear-mounted
In-line drive for shallow installations.
Production Process
Every sun gear goes through four controlled stages, from material selection to final inspection.
Production Process
Material Selection
We use high-quality alloy steel for our sun gears, including 20CrMnTi, 20CrNiMo, 42CrMo, and custom materials according to customer needs. These materials have excellent toughness, high hardness, and strong wear resistance, providing reliable support for the long-term operation of the sun gear.
Processing Technology
Our sun gear production uses precision hobbing, shaving, grinding, and gear honing technology. The tooth surface is finely processed to ensure good contact and low noise during meshing. At the same time, strict coaxiality and runout control are carried out to avoid assembly deviation.
Heat Treatment
Our sun gears undergo carburizing and quenching, quenching and tempering, or high-frequency induction hardening, depending on the application. The surface hardness can reach HRC58–62, with a deep hardened layer and strong bending and contact fatigue strength, effectively reducing the risk of tooth breakage and wear.
Quality Inspection
Full dimensional inspection, hardness testing, metallographic analysis, and dynamic balance testing are performed on every sun gear. Complete inspection reports are provided to ensure compliance with design and application standards.
Industries That Use Precision Sun Gears
Our precision sun gears are used in high-precision transmission equipment such as industrial robots, precision reducers, and medical machinery, where small backlash and stable transmission are essential. As the core driving part of a planetary gearbox, the sun gear directly determines the efficiency, noise, and service life of the whole drivetrain. We have supplied customized high-precision gears to robot arm manufacturers in Canada, Germany, and other countries.
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Frequently Asked Questions.
Everything you need to know about precision sun gears: function, materials, customization, and precision.
