SunUs Spirit of innovation and R&D like sun running keeps moving forwards day after day.

The company began with Tungli Gear Works. The company founder set up its own brand, SunUs, until 2000, and recalled that he went back and forth at home and abroad in his early days to expand the business. Different time zones let his watch read late at night while the scene outside of the plane was still daytime, which made him deeply impressed. To deliver brand orientation and spirit, SunUs brand logo was born. The design was inspired by the planets continuing running around stars from ancient times as the Sun is always shining on us — passing a mission of sustainable operation.

About Us Planetary Reducer

More than 60 years of extensive experience in gear manufacturing

Our company possesses outstanding design capabilities and has over 60 years of experience in gear manufacturing and more than 20 years of expertise in planetary gear reducers. We are committed to ensuring quality and customer satisfaction. We provide customers with high-quality, low-backlash, and long-life planetary gear reducers specifically designed for servo motors.

ISO 27001
Taiwan Excellence Award
Taiwan Excellence Award
ISO 9001
ISO 9001

Professional service

Design and manufacture of planetary gear reducers, reduction drives, and precision transmission parts and so forth.

Design and manufacture reducers entrusted by our clients.

Manufacture high-precision ground racks and pinions, worm wheels and worm screws.

DMU mechanical anti-backlash reducer
关于我们 台湾精品奖

Company history

About Us Gear

Dedicating to gear manufacture and development, SunUs has more than 60 years of experience in gears, worm gears and worm wheels.


SunUs was founded in Xitun Dist., Taichung City


Introduced universal PG series


Introduced hollow-shaft HG series


Introduced huge-torque UM series


Introduced HP series


Introduced W-axle backlash-free WG series


Introduced shorter-shaft DG series


Introduced economic AG series


Introduced mechanical backlash-free DMU series


Introduced right-angle planetary gear reducers


Produced high-precision slewing bearings


Choosing SunUs: Unlocking the Future of the Machine Tool Industry

SunUs boasts renowned machine tools and an experienced machining team, offering excellent and consistently high-quality products. Excess capacity ensures our ability to meet diverse customer needs. Renowned for our superior quality, we continually enhance our knowledge and technology to maintain an industry-leading position. Partner with us, and you will receive the best transmission solutions.

About us Factory

Technical prowess and unparalleled quality

Our pride lies in our CNC machining equipment, representing excellence, our technical prowess, and our commitment to delivering high-quality products. Our highly experienced technical team utilizes these tools to ensure that every product meets the highest standards. This is reflected not only in the precision of our products but also in our exceptional quality and service.

About Us Company Machine

Quality First: The Craftsmanship of Planetary Gearbox

An experienced technical team is responsible for assembling various components into high-quality planetary gearboxes. Each assembly step undergoes meticulous inspection and rigorous testing to ensure exceptional and reliable product performance. We, with a keen eye for details, are committed to providing the most outstanding products. This commitment is embedded in our work culture, making us a leader in the industry.

about us assembly