Components for the wind industry

Liebherr is the only manufacturer worldwide that is not only able to supply individual components as large diameter bearings, slewing drives, electric motors and hydraulic cylinders, but able to supply hydraulic and electromechanical pitch systems and electromechanical yaw systems for wind turbines.

An important element of the cooperation with customers from all over the wold is the applied application-specific engineering necessary for adapting and matching the individual components to each other. Liebherr works together with virtually all well-known turbine manufacturers and to date has supplied components for more than 15,000 wind turbines. The product portfolio covers components for 800 kW installations up to solutions for multi-megawatt turbines for offshore wind farms.

Pitch systems

Liebherr produces well-engineered mechanical systems for rotor blade adjustment. Electric pitch systems are based on one or more mechanical gear units with electric motor, which drive a geared large diameter bearing.

Hydraulic pitch systems are based on one or more hydraulic cylinders and a large diameter bearing without gears to adjust the rotor blade position. In either case, the precise positioning of the rotor blades results in maximum energy yield.

In pitch systems, the following components from the Liebherr portfolio can be applied:

Three-row roller bearings for higher load capacity and more cost efficiency

Wind turbines are growing steadily in an effort to attain higher energy yields. The options of adapting existing designs to the growing dimensions and more demanding load profiles has however limits - particularly in regard to rotor blade bearings. Therefore, in addition to the current single-row and double-row four-point bearings, Liebherr now also offers three-row roller bearings for pitch systems. This highly increases the potential in terms of dimensioning and load capacity.

Three-row roller bearings for pitch systems (PDF, 2.1 MB)

Yaw systems

Depending on the specific system design, up to twelve or more high-performance planetary gearboxes drive a large diameter bearing and ensure precises as well as reliable wind direction tracking. Liebherr configures the entire yaw system, including the necessary electric motors, precisely to the needs of the customers. This guarantees a high level of system availability.

The following components from the Liebherr portfolio are ideally suited for use with yaw systems:

Yaw module concept study

In the course of the last 20 years, variety of parts and complexity have steadily increased within the wind industry. With this study, Liebherr wants to show new ways to achieve more flexible yaw system. The result is a module which integrates all functions of the yaw system in a ready-to-install unit.

The current concept offers a wide range of advantages. It can be easily scaled in terms of size and capacity and adapted to the different turbine platforms. Additionally, the use of standard components across all platforms hold great cost savings potential. Further, the implementation of the yaw system as a ready-to-install module makes it possible to simplify processes for the turbine manufacturer along the entire value chain.

Yaw module concept study (PDF, 3.7 MB)

Competences

Based on a continuous quality management and the use of cutting-edge technologies, components by Liebherr meet the highest demands regarding quality and performance.

Product and system expertise

The right design and analysis of a component is decisive for its reliability and service life. For multi-megawatt wind turbines a design using Finite Element Methods (FEM) is essential, as the sensitivity to strain increases the larger the system gets. In addition, defined approval processes for new and further developments ensure optimal product configuration and thus high reliability.

High vertical integration

In order to ensure consistent high quality and reliability, all manufacturing processes must be optimally aligned. Hence why Liebherr improves all production processes on an ongoing basis and continually invests in cutting-edge production facilities.

Quality-oriented

Reliable components with a consistently high quality are particularly important for wind turbines in order to avoid long production downtimes and high logistics costs. To ensure that the quality standards achieved in the construction using Finite Element Methods (FEM) and Failure Mode Effects Analysis (FMEA) are also maintained in subsequent processes, all company processes are designed to maintain quality.

  • Quality testing of large diameter bearings
    Large diameter bearings with a diameter of up to 6,000mm are measured and tested in a fully air-conditioning measuring laboratory.

    Quality testing of large diameter bearings

    Large diameter bearings with a diameter of up to 6,000mm are measured and tested in a fully air-conditioning measuring laboratory.

  • Wide range of large diameter bearings
    Large diameter bearings from Liebherr are available in different designs and a diameter range from 400 mm to 6,000 mm. Larger sizes are possible in a segmented design.

    Wide range of large diameter bearings

    Large diameter bearings from Liebherr are available in different designs and a diameter range from 400 mm to 6,000 mm. Larger sizes are possible in a segmented design.

  • Large diameter bearings for wind turbines
    Liebherr produces large diameter bearings for the adjustment of rotor blades and yaws in wind turbines. They can be designed as single-row or two-row four point bearings with external or internal gearing.

    Large diameter bearings for wind turbines

    Liebherr produces large diameter bearings for the adjustment of rotor blades and yaws in wind turbines. They can be designed as single-row or two-row four point bearings with external or internal gearing.

  • Slewing drives for wind turbines
    Slewing drives from Liebherr for the adjustment of rotor blades and yaws in wind turbines are characterized by reliability and precise positioning.

    Slewing drives for wind turbines

    Slewing drives from Liebherr for the adjustment of rotor blades and yaws in wind turbines are characterized by reliability and precise positioning.

  • Large diameter bearings for pitch adjustment
    Installation of large diameter bearings for pitch adjustment at a customer's factory.

    Large diameter bearings for pitch adjustment

    Installation of large diameter bearings for pitch adjustment at a customer's factory.

  • Stress tests in real conditions
    Stresses throughout the entire service life of the gearbox are simulated in test runs.

    Stress tests in real conditions

    Stresses throughout the entire service life of the gearbox are simulated in test runs.

Integrated lubrication supply for gearboxes in blade and yaw adjustment

Liebherr components for the wind industry

Liebherr is the world's only manufacturer who can supply not only individual components, but also the entire system used for electromechanical and hydraulic rotor blade adjustment as well as yaw adjustment in wind turbines.

Call up video

Liebherr is the world's only manufacturer who can supply not only individual components, but also the entire system used for electromechanical and hydraulic rotor blade adjustment as well as yaw adjustment in wind turbines.

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