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BHS Power Distribution Gear Units

The BHS power distribution gear unit converts torque in turbo drive trains at trans­mitted powers up to 170 000 kW or at speeds of up to 100 000 rpm. BHS power distribution gear units are especially well-suited for use where other types of gear units exceed their technical limits. They utilize the advantages of parallel shaft and planetary gear units and leverage these advantages to be able to combine high rotational speeds and high powers. Examples of where the need for this capability arises are machine trains with gas turbine-driven turbo compressors.

Even under harsh operating conditions, BHS power distribution gear units exceed 250 000 operational hours. The gear unit efficiency in these high-end applications can reach levels of up to 98 percent.

Beside this Voith offers also other types of turbo gear units.



Voith GmbH & Co. KGaA
Hans-Böckler-Straße 7
87527 Sonthofen, Germany

Tel. +49 8321 802-825

Service Sales
Tel. + 49 8321 802-826

24/7 Emergency Contact
Tel. +49 8321 802-555

Technical data

Power transmission up to 170 MW
Speeds up to 100 000 rpm
Efficiency up to 98%
Gear ratio 1:1 – 11:1
Housing design welded, cast
  • spur
  • double-helical
  • single-helical toothing

Advantages and Benefits

BHS power distribution gear units from Voith

  • are customized to the operator's requirements.
  • offer an excellent price-performance ratio, since they can also be used in speed and power ranges that are beyond those of other types of gear units. This makes expensive direct-drive or redundant machine trains unnecessary, saving investment costs.
  • impress with low maintenance and inspection costs. The gear units are com­posed of a small number of individual components.
  • have a long lifetime, thanks to the power splitting principle. Component diameters are smaller, resulting in reduced centrifugal forces on the rotating parts, such as gears and bearings. This considerably reduces replacement costs.
  • deliver greater efficiency than parallel shaft and planetary gear units at their load limits. Your power needs are reduced, your operating costs drop, and fewer CO2 emissions are released, protecting the environment.
  • have a greater safety margin. The likelihood of a failure or fault is reduced. Operational productivity increases.
  • make compact, low-weight and space-saving drive trains a reality, thanks to Voith's special design and construction practices. This particularly reduces investment costs in places where space is especially expensive, e.g., offshore.

Typical applications

Driving machine:

  • Gas turbine
  • Electrical motor
  • Steam turbine

Driven machine:

  • Compressor (radial)
  • Generator


  • Oil & gas (upstream, midstream, downstream)
  • Petrochemicals
  • Test beds

Technical information

Design and function

A BHS power distribution gear unit consists of a gear set and a housing that is very stiff and resistant to flex. The gear set consists of two central sun pinion shafts and up to three planetary gears. Spindles support the planetary gears on hydrodynamic film bearings. Through the planetary wheels there is a power split, like it is applied at the BHS planetary gear units.

BHS power distribution gear units increase or reduce the input speed. Speed-in­creasing gear units are typically used between gas turbines and compressors, for example, whereas speed-reduction gear units are used between gas turbines and generators. BHS power distribution gear units can be designed in accordance with a wide variety of standards: DIN 3990, ISO 6336, ISO 13691, AGMA 6011, API 613 or the corresponding Voith Standard that exceeds the quality requirements of these standards.