A Flender gearbox is a high-quality industrial gear unit manufactured by Flender GmbH, a German company with over 120 years of history and a globally recognized leader in mechanical and electrical drive technology.-1-38

Founded in 1899 in Düsseldorf, Germany, Flender began by making wood pulleys before growing into one of the world’s foremost suppliers of gear solutions.-38 Since 2005, Flender has been part of the Siemens Group, operating as an independent subsidiary.-38-1 While Siemens acquired Flender in 2005, the company underwent a significant transformation in 2017 when the Siemens Mechanical Drives unit was rebranded and began operating in the market as Flender GmbH, a Siemens Company-38. Today, Flender has over 50 locations worldwide, employs more than 8,000 people, and generates annual revenue in the billions of euros, solidifying its status as a truly global market player.-1–

Product Portfolio: More Than Just Gearboxes

While Flender is best known for its gearboxes, its product range extends far beyond. Flender offers a comprehensive portfolio that includes:

• Industrial Gear Units: From standard helical and bevel-helical gear units to highly specialized planetary gearboxes like the PLANUREX series, which can handle nominal torques up to an astonishing 2,600,000 Nm.-1– Other notable series include the SIP planetary gear unit, which offers a high power density and a torque range from 10,000 Nm to 80,000 Nm.-47

• Couplings: Flender possesses the world’s largest portfolio of industrial couplings. This includes flexible, highly flexible, torsionally rigid, and hydrodynamic couplings, as well as solutions for rail applications.–-1 These couplings are essential for connecting shafts while compensating for misalignments and vibrations, with a torque range spanning from as low as 0.5 Nm up to 10,000,000 Nm.–

• Winergy Wind Energy Components: Under its Winergy brand, Flender is a dominant force in renewable energy. Winergy designs and manufactures complete drive trains for wind turbines, including gearboxes, generators, main shafts, and couplings.– Since delivering its first gearbox for wind turbines in 1981, Winergy has supplied over 175 GW of gearbox capacity and installed more than 15,000 gearboxes globally.–

• Digital and Lifecycle Services: Flender offers a full suite of services, including spare parts, repairs, retrofits, and condition monitoring. It is also a pioneer in digital solutions with its AIQ condition monitoring system and remote expert services.–

The FLENDER ONE Platform: A New Era of Efficiency

One of Flender’s most significant recent innovations is the FLENDER ONE platform. Launched in 2022, it represents a paradigm shift in how industrial gearboxes are specified and delivered.-33-28 Flender ONE solves the traditional trade-off between customization and mass production, offering fully customizable gearboxes with the speed and cost-effectiveness of standard catalog products.-28

The platform is built on three core pillars:

1. Individually: FLENDER ONE gearboxes are tailored precisely to customer specifications. Customers can configure their gearbox in minutes using an online tool by entering just three parameters: application, power requirement, and speed.-33-28 With over a million possible configurations, the platform covers more than a hundred applications, including pumps, conveyors, cranes, agitators, and mixers.-33-28

2. Efficient: FLENDER ONE gearboxes are designed for operational excellence. The platform reduces planning time by approximately 25% and cuts power loss by an average of 20% compared to previous models, leading to significant energy savings.-33 The optimized Metaperform® gearing also contributes to a 30% higher thermal capacity.–

3. Smart: Every FLENDER ONE gearbox comes factory-equipped with the AIQ Core sensor, an integrated intelligence system that monitors speed, temperature, and vibrations around the clock.-33 The system can detect the slightest irregularities, evaluate component conditions, and even assist with the correct alignment of the drive train, enabling predictive maintenance and minimizing unplanned downtime.-33

Applications Across Key Industries

Flender gearboxes are the workhorses that power heavy industry around the world. Their robustness, reliability, and efficiency make them indispensable in sectors such as:

• Wind Energy: As the market leader in wind turbine drive systems (with over 50% global market share), Flender is at the forefront of the renewable energy transition.-63

• Mining and Cement: Flender gear units are used in crushers, mills, apron feeders, and extensive conveyor systems under the harshest operating conditions.-47

• Steel and Metals: From rolling mills to material handling, Flender gearboxes provide the high torque and durability required for demanding metal production processes.-47

• Marine: Flender supplies specialized gearboxes and marine drives for ship propulsion and other naval applications.–

• Oil & Gas, Power Generation, and Water Treatment: Flender’s broad product portfolio serves these critical infrastructure sectors, driving pumps, compressors, blowers, fans, and aerators.-33

Conclusion

A Flender gearbox is more than just a mechanical component; it is a sophisticated and highly engineered drive solution built on over a century of German engineering excellence. From the heavy-duty workhorses of the PLANUREX series to the highly efficient and smart FLENDER ONE platform and the renewable energy leadership of Winergy, Flender provides the power, precision, and intelligence that modern industry relies on.