Scanned from RADM Smith’s scrapbook of his trip aboard the dirigible Graf Zeppelin over the Arctic in 1931. Photo via USCG.mil
[contextly_sidebar id=”MhI7lwjN4axzYF31JodkPBp13Okmt2wh”]100 years ago, when “aeroplanes” were an interesting new invention, the age of the Zeppelin was taking off from Friedrichshafen, a quaint village along the shores of Lake Constance in southern Germany.
In that day and age, the term shipyard had to be qualified as Friedrichshafen was home to an airship-yard, with hangars large enough to fully enclose a hydrogen-filled Zeppelin 128-meters in length.
These “ships” were high technology for the day, requiring innovations in lightweight, yet strong construction and bespoke engines and transmissions. With few suppliers available to support this new industry, airship pioneer Ferdinand von Zeppelin founded Luftschiffbau Zeppelin GmbH, from which a number of companies spawned. This included engine manufacturer Luftfahrzeug-Motorenbau GmbH in 1908 and gear manufacturer Zahnradfabrik in 1915. These two companies were led by Wilhelm and Karl Maybach and Max Maag, respectively, and later evolved to become MTU (Motoren- und Turbinen-Union) and ZF Group.
MTU is perhaps a more familiar name for those in the maritime and offshore industry as it reflects the brand name of the power system aboard thousands of ships worldwide, however attached to nearly every MTU engine is a gear box made by ZF.
In fact, attached to tens of thousands of ship engines, car engines, wind turbines, trains and countless other industrial applications worldwide are gearboxes by ZF. Upon a visit to their headquarters last week in Friedrichshafen I found out the company employs over 71,000 people worldwide with over 18.4 billion euros in sales last year. In May, the company acquired US-based TRW Automotive adding bringing roughly 60,000 new employees and 12 billion euros in additional turnover under the ZF brand.
Surprisingly, Wilfried Meichle, Key Account Manager Sales within ZF’s Marine Propulsion Systems group notes that their marine sector business provides only about one percent of the turnover within ZF Group. This includes their portfolio of azimuth and tunnel thrusters, transmissions, fixed pitch propellers and electronic control systems.
In North America, ZF holds the top market share of azimuth thrusters, however these are primarily targeted for tugs, pushboats and hybrid power applications of up to 5,000 horsepower notes Meichle. The offshore support sector is largely above those horsepower ratings.
Worldwide, 19,800 ships operate with ZF transmissions coupled to any number of different engines including MTU (now Rolls-Royce), Caterpillar, Doosan, Wartsila, MAN and others.
Here’s an inside look at where some of those transmissions and gears are built:
Above, raw materials come in from the foundry and are subsequently machined into whatever gear configuration is required by the client, however the process does not end there.
Next, the gears needs to be quenched in an oil bath and CO2-filled atmosphere in order to increase the hardness of the material to roughly 62 Rockwell.
Once the material is hardened, further tweaking is needed to ensure each gear is perfect. ZF notes that only microns of material is taken off the face of each gear at this stage, but it makes the critical difference between a noisy transmission and one that functions silently and effortlessly.
Materials such as the shafts pictured below are only hardened to around 40 Rockwell.
A milled and polished shaft is precisely gauged to ensure it is exactly the right size.
After assembly, the transmissions are tested thoroughly to ensure minimal vibration and noise. In the facility pictured below, the entire room is isolated on an air cushion from the rest of the building to ensure any vibration or noise as a result of the test is due to the transmission itself and not the surrounding environment.
Completed transmissions await shipment to the client (below)
Standing in front of a ZF ToughGear marine transmission are: (L) Wolfgang Biermeier, Manager, Marketing & Communications, (C) Wilfried Meichle, Key Account Manager, (R) Dominic Roth, Head of Sales, Marine Propulsion Systems
From ZF’s first beginnings 100 years ago building planetary gear systems for air ships, to today’s ultra modern transmissions for high horsepower applications, the company’s distintive trademark has found itself on millions of transmissions around the world. The ZF brand is unique in many respects to others in this industry in that it has managed to keep its footing throughout the challenges of the past century and a devastating world war to perfect what it originally set out to do.
By Ellen Francis (Reuters) – Interpol has issued red notices for the captain and owner of the ship that carried the chemicals which devastated Beirut in an explosion in August, killing 200...
By Chen Aizhu (Reuters) – China has issued 5 million tonnes of clean marine fuel export quotas in the first release for 2021, to five companies including a private refiner,...
By Andrea Shalal (Reuters) – The United States is urging European allies and private companies to halt work that could help build the Nord Stream 2 natural gas pipeline and...
December 23, 2020
Total Views: 823
Sign Up Now for gCaptain Daily
Just enter your email and get hot news every morning
We use cookies on our website to give you the most relevant experience. By clicking “Accept”, you consent to the use of ALL the cookies.
This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.