DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

Economy and environment in focus: DIWA automatic transmissions for buses

    Accelerate, shift, brake, shift. City bus operators face numerous challenges on the road each day. As a bus manufacturer or operator, rely on Voith’s globally successful DIWA automatic transmissions. With DIWA, you can benefit from intelligent shifting and reduced downtime, maintenance costs and fuel usage.

    Today, over 400,000 city and intercity buses worldwide use a DIWA automatic transmission. Millions of passengers enjoy a more comfortable ride with less noise. At speeds that require other transmissions to shift two to three times, Voith offers you the benefit of stepless accelerating and braking.

    Contact our experts Brochure DIWA NXT

    Your benefits

    • Lower fuel consumption
    • Reduced air and noise pollution 
    • Maximum comfort for passengers
    • Low maintenance costs
    • Lower installation effort
    • Global market leader in CNG buses
    • Meets the needs of demanding BRT systems worldwide


    The right transmission.
    At the right time.


    DIWA NXT is the consistent response to the growing demand for environmentally friendly drive solutions. Thanks to its hybrid system, the automatic transmission closes the gap to alternative drive systems and achieves fuel savings of up to 16%. DIWA NXT offers fleet operators and drivers a wide range of options in a solution that is efficient, comfortable and quiet.

    DIWA NXT: Automatic transmission for all bus operation


      DIWA NXT is the next generation transmission for city and regional busses and coaches. It is optimized in terms of efficiency with a 2nd overdrive, a separate retarder and an optional Central Recuperation Unit (CRU) based on 48V technology to keep fuel consumption as low as possible.

      The DIWA NXT is a mild hybrid system with various advantages. It is highly integrated into the flywheel housing of the engine and works with a specifically developed inverter, which is located on the top of the transmission to avoid line losses. A specifically designed battery and cooling system including an optimized DC/DC converter is available. The 48V mild hybrid system is developed specifically for buses and carries out various functions like stop-start, coasting, recuperation during braking procedures or even boosting-support. The new DIWA NXT is one of Voiths answers on the increasing demand for efficient and green driveline technologies and helps to bridge the gap between Diesel and alternative drivetrain technologies.

      • World-premiere: performance of differential converter and retarder can now be independently optimized
      • Recuperates braking energy based on a highly-integrated 48V mild-hybrid system
      • Reduces fuel consumption by up to 16%
      • Reduces air and noise pollution
      • Seamless hardware-software integration from one provider: Voith Digital Ventures

      savings through the transmission up to
      reduction in fuel consumption up to
      savings through the hybrid system up to

      Demo bus takes to the road on scheduled service

        Success Story DIWA NXT

        Our solution to increasing demand for new drive concepts: With its mild hybrid system, the latest generation of our DIWA automatic transmission is closing the gap between diesel-only systems and other alternative drive technologies.

        And demand for these kinds of solutions above and beyond the pure internal combustion engine is steadily increasing. The reason for this is that to make further progress in reducing CO2, bus operators need to restructure their fleets substantially in the next few years.


        Multi-week testing phase at OK.go

        As far as emissions are concerned, the existing engine concepts have largely reached their limits. At OK.go, a regional bus company whose services are an important component of the public transport system in the Ostalbkreis district on the outskirts of Stuttgart, the decision-making process for the switch is also already well underway. The multi-week testing phase of our demo bus, a combination of Iveco Crossway and our DIWA NXT, is an important part of this journey towards more sustainability.

        Dominik Jakob, Managing Director of OK.go
        For economic reasons too, it makes sense to store the energy produced during braking and decelerating. The electrical energy can then be used for pulling off and to supply the vehicle electrical system. This reduces fuel consumption as a result.
        Dominik Jakob, Managing Director of OK.go
        The DIWA NXT gives the vehicle a lot of power when starting, and the gear shifting is very responsive at all times. I’ve used about ten percent less diesel than normal, even though the air conditioning was running at the highest setting during this hot weather.
        Dietmar Vogt, bus driver at OK.go
        Dietmar Vogt, bus driver at OK.go
        The DIWA NXT gives the vehicle a lot of power when starting, and the gear shifting is very responsive at all times. I’ve used about ten percent less diesel than normal, even though the air conditioning was running at the highest setting during this hot weather.
        Dietmar Vogt, bus driver at OK.go

        Find out more about the multi-week testing phase at OK.go

        Download the success story now

        DIWA.6 automatic transmission

          Two modern red double-decker buses at a bus stop

          Whatever your requirements as a bus manufacturer or operator, with Voith you’ll find a suitable DIWA automatic transmission that lowers your fuel consumption and decreases your carbon footprint.

          Destination: 100% economical – DIWA.6

          The DIWA.6 automatic transmission is the global standard for economically advantageous and sustainable city and intercity buses.
          Together, intelligent acceleration management and need-based reduction of operating pressure reduce fuel consumption.
          As a bus manufacturer or city bus operator, you profit from a dramatic increase in the transmission’s efficiency.

          DIWA.6 Animation

          Your benefits at a glance

          • Optimized fuel-efficiency
          • Lower air and noise pollution
          • Maximum passenger comfort and safety
          • Tried and true stop-start technology
          • Lower maintenance and installation costs
          • High degree of reliability and availability


          Stop-start technology for DIWA.6

          Better for the environment:
          Our stop-start technology for your DIWA.6 transmission

          City buses spend up to 40% of their operating time in idle mode. Tried and tested worldwide, Voith’s stop-start technology uses this downtime to greatly reduce fuel consumption and emissions. Do your part to combat climate change while making public transportation more attractive.

          • Proven in operation in more than 1,500 buses
          • Reduces fuel consumption by up to 12 %
          • Reduces air and noise pollution
          • Greater riding comfort for drivers, passengers, pedestrians and residents
          • Software for easy updates

          Functional principle DIWA automatic transmission

          Voith automatic transmission for buses - Comparison scheme of the DIWA functional principle
          Specially developed for public transit buses, these transmissions are a must-have for economical operation: Reduced complexity and less installation effort for the manufacturer, lower fuel consumption and rock-bottom maintenance and service costs for the operator. And not only today - but for the entire service life of the bus.
          Learn more about how it works in our detailed videos

          Our Service - Part of Your Business

            Why use Voith Service?
            Why use Voith Service?

            • Everything from a single source: development, design, production – and service!
            • Decades of product experience as an original equipment manufacturer and service provider
            • Fast and smooth cooperation and best service thanks to a worldwide network of service locations
            • Long-term partnership and planning security are guaranteed due to longstanding corporate stability

            To our entire service portfolio Voith Turbo Webshop

            Questions? We are here to help.

              Contact our experts

              International DIWA references

                Worldwide, bus operators large and small value the fuel savings made possible by Voith’s innovative DIWA transmissions. These transmissions have the ability to flexibly adapt to a range of infrastructure and topography specifications, which makes them usable in almost any market. This is especially true in emerging markets such as Africa, where the demand for public transportation is continually rising.

                Current distribution of the 160,000 DIWA transmissions used worldwide
                A world map shows the distribution of currently 150,000 DIWA automatic transmissions used across the globe

                DIWA in bus rapid transit systems (BRT)

                  Two red BRT buses driving in separate lanes in Bogotá
                  TransMilenio, Bogotá, Columbia
                  – Market share Voith: 84 %

                  Since TransMilenio’s launch, driving times have dropped by 32% and emissions by 40%. The TransMilenio BRT system transports around 2 million passengers each day, making it one of the most efficient BRT systems worldwide. Today TransMilenio is considered a benchmark for many cities worldwide looking to introduce a BRT system.

                  Voith is a CNG-powered bus leader

                    Bus at a natural gas station

                    Environmentally-friendly operations in North America

                    When phase two of the GHG regulations went into effect with the aim of reducing greenhouse gases in North American cities, there was a clear uptick in demand for climate-friendly CNG systems. Today, over 400 DIWA.6 transmissions are used in CNG engines throughout North America – a number that keeps on growing.
                    A row of modern new buses

                    Establishing a modern transportation system in Baku, Azerbaijan

                    For the first European games in Baku in 2015, 300 new buses to transport fans were equipped with Voith’s DIWA.5 and DIWA.6 automatic transmissions. This marked the start of the city’s modern public transportation system.

                    Further quality power train products from Voith

                      Drivetrain Excellence - Voith Electrical Drive System for buses
                      Drivetrain Excellence - Voith Electrical Drive System for buses

                      The perfect drive system for changing intra-urban mobility: As an established system supplier with many years of experience and a partner to the bus industry, we have combined our comprehensive know-how in the fields of drive systems and E-mobility. Voith has developed a pioneering electrical drive system for local public transit. The Voith Electrical Drive System (VEDS). 

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