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Every day we hear how energy costs are increasing due to diminishing energy resources. Globally, countries are looking to find new energy sources or attempting to decrease their energy consumption. Even in everyday consumer life we see many new products being developed to help with this problem, such as led lighting, electric vehicles and even smart plugs and bulbs.

With regards to the industrial gearbox industry, there are also new products being developed to assist with energy saving. Historically, worm gearboxes have been installed in many different types of applications because of their compact design and low purchase cost. However, despite these initial advantages, this product has a major disadvantage which is their low efficiency. High friction between the worm and worm gear increases energy losses and decreases efficiency. With increasing ratio between the worm and worm gear, efficiency decreases even further. At high ratios, because of low efficiency, half of the motor power can be lost. The cost of this loss can be very high, especially with 24 hour running applications.

Yilmaz UK European production facility, Yilmaz Redüktör, started serial production of high efficiency small bevel-helical K-Series gearboxes in 2013. The K-Series gearboxes have all the advantages of a worm gearbox such as compact body and low purchase cost. This ensures the K-series gearboxes are considered as a genuine replacement option for worm gearboxes. They are Monobloc design, 2 and 3 stage gearboxes which can have high ratios in their compact body. All K-Series gears are cut using profile grinding machines. This ensures the production of high quality, high efficiency, and low noise gearboxes.


  • High efficiency (%92-96)
  • Low working temperatures
  • Compact body
  • Low purchase costs
  • Wide ratio range (2-3 stages)
  • Rigid body (GG25 material)
  • Low noise


  • Direct coupled motor connections
  • B5/B14 IEC motor flanges
  • Connection flanges for servo-motors
  • Output shaft options with shrink disk
  • Output shaft options with spline
  • Output flanges and connections with torque-arm

Performance Comparison

 K-SeriesWorm Gearbox
Motor Power [kW]0,751,1
Gearbox TypeKR203-80M/4CEV80.00
Output Speed [rpm]2223
Output Torque [Nm]303274
Gearbox Efficiency93,0%63,0%
Motor Efficiency79,6%81,4%
Annual Working4.000 Hours4.000 Hours
Price [pence/kWh]1616
Consumption [kWh]3.769 (Annual)3.769 (Annual)
Total Electricity Cost£603£865
Annual Savings£262
Saving Ratio30%


As shown in the above example, only a 0.75kW motor is required for the small K-Series gearbox to produce the same output torque as a 1.1kW motor being used with a Worm gearbox. If the application runs 4000 hours annually, there would be an estimated saving of £262 (per gearbox) using the K-Series gearbox. The payback period on a K-Series gearbox investment is therefore relatively short, especially if the annual working hours are higher than 4000 hours or if several gearboxes are installed. Furthermore, K-Series gearboxes have a higher nominal torque value when compared to the same size, similar ratio worm gearbox which means the service life will be much longer.

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