ikona pitch drive-090109

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• Ikona technology originates from Russian (Ukrainian) military developments between 1986 and 1991 - purchased by Ikona in 1992

• US Patent # 5,505,668 granted on April 06, 1996, covering the “Ikona tooth-form”

Patented Gear Technology

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The key factor

Ikona Gear tooth form vs. Involute (Traditional) tooth form

Ikona Gear tooth form enables

High Contact Ratio and Zero Backlash


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Resulting Advantages:

High Gear Contact Ratio

• Increased gear strength and surface durability

• Smaller and lighter gears

• Lower noise and vibration levels

• Increased shock resistance

Tooth Difference as Low as 1

• High single-stage speed reduction ratios (450, 260, 200, 80, 60, 30, 20 : 1)

• Reduced number of components, length and weight of the unit.


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Resulting Advantages:

Zero Clearance and Minimal Torsional Backlash

• Lower noise and vibration levels

• Increased gear life

• Accurate positioning and repeatability

Flexible Manufacturing Methods

• Using traditional gear manufacturing and verification processes

• Using variety of materials: steels, nonferrous alloys, cast irons, powder-metallurgy and plastics


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Blade pitching

Gearbox

Yaw drive

Blade Pitching and Yaw Drive•High contact ratios allow gearing to withstand higher loading conditions reducing maintenance concerns

•Has potential to decrease the size and weight of gearing allowing for a more compact design

•Increased response time, and allow for more precise and repeatable positioning of blade and nacelle

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Application-specific Design

- Wind Energy

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Blade pitching

Gearbox

Yaw drive

Main Drive Gearbox•High contact ratios allow gearing to withstand higher loading conditions and reduce vibrations; should lower maintenance

•High gear speed ratios allow for less required gearing; should reduce the size making it easier to install and maintain

•Minimal to zero backlash increases gear life, and lowers noise level

•Ease in manufacturing gearing should help in alleviating supply chain issues

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- Wind Energy

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- Pitch Drive

Pitch Drive• Enclosed and integrated with the

structure

• Incorporates: motor, gear drive, bearings, resolver, manual over-drive, limit switches, hard stops

• No external hardware, cables

• Lubricated

• Similar unit met appropriate Defense Standards (MIL-STD)

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Manual over-drive,covered (opt.)

Resolver (Orientation sensor)

Motor+ primary reduction (opt.)

+ brake

“Blade side”

Base (stationary)


- Pitch Drive

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Maintenance door could be added

Large hole at the center of the drive, could be over 10 inches in

diameter, to provide an opening for routing electrical cables

Lubrication ports(can be extended for direct outside access)


- Pitch Drive

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Rotating components run in sealed lubricated environment

Thin section angular contact ball bearings react thrust loads, overturning moment and gearing loads

Ikona gears enable high final reduction ratio.

2-3 pinion design to optimize bearing loads


- Pitch Drive

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Limit switches(±90° here)

Resolver (Orientation sensor)

Hard Stop(2 positions)

Switch trigger


- Pitch Drive

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- Communication

Satellite Antenna Pedestal (Elevation and Azimuth Drives)

• High positioning accuracy, torsional backlash of the whole system 0.45 mrad at 45 mph winds

• High rigidity, torsional stiffness of the pedestal 11,000,000 in-lb/rad at 45 mph winds

• Total reduction ratio 2,600:1, for each axis. High single stage gear reduction ratio 260:1

• Fully operational up to 65 mph winds and 1/2” of ice, and survives over 75 mph winds

ikona pitch drive-090109

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