Damped powertrain and lighter chassis

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Damped powertrain and lighter chassis

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Seals for power unit applications that also dampen vibrations and a new material for aircraft landing gear – Trelleborg has exciting news for the transport industry.

Seals from Trelleborg Sealing Solutions in the D-Seal design are primarily used in trucks and construction vehicles, which in addition to high tightness also require effective damping to prevent damage to engines and transmissions.

(Image: Trelleborg Sealing Solutions)

Two are better than one – true to this motto, Trelleborg Sealing Solutions has further developed its D-Seal design to make seals in vehicles more efficient: “The main applications for D-Seal are engines and transmissions. Unlike O-rings and traditional static seals, D-Seal not only provides a tight seal, but also dampens vibrations to prevent damage,” says Peter Astrom, Product Manager at Trelleborg Sealing Solutions. “Especially on the road to e-mobility, it is important for Trelleborg to also make the current internal combustion engines cleaner. The improved D-Seal design optimizes powertrain efficiency and helps reduce CO2 emissions.”

Dual purpose design

The D-Seal design with the dual function of elastic sealing and damping is specially designed for the automotive, truck and transportation industries. According to Trelleborg, the D-Seal profile can not only reduce CO2-Reduce emissions, but also extend engine service intervals.

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Typical of D-Seal is the flexible double hump on the top, which not only prevents misalignment during installation, but also improves damping properties. Thanks to sharp sealing edges in the corners, the D-Seal profile also prevents the formation of disruptive cavitation in liquids, emphasizes the sealing specialist.

Customized profile

As an alternative to O-rings, X-rings, square rings and other oval seals, Trelleborg Sealing Solutions offers two main D-Seal profiles: an optimized double-D seal and an updated single-D seal. The robust designs each have a tailored profile that effectively absorbs vibrations while maintaining strength and stiffness. D-Seal profiles are available in a wide range of industrial grade materials and can be manufactured to have specific properties such as temperature, pressure or media resistance.

In order to reliably detect foreign objects, IDG-Dichtungstechnik has developed Manoy Detect, a sealing material to which metal-detectable additives are added.  (Image: IDG-Dichtungstechnik GmbH)

In addition, they can be colored to facilitate identification and camera recognition within automated assembly processes. Additional assembly coatings can also be added to D-Seal design gaskets to reduce assembly forces and eliminate lubrication during installation.

The design has no shape or parting line on the sealing surface, eliminating the risk of joint failure or potential leakage.

“Unlike O-rings, D-Seal design seals are easy to install and do not twist in the groove during installation. This makes them perfect for use in automated production,” says Peter Astrom. “The design has no shape or parting line on the sealing surface, eliminating the risk of joint failure or potential leakage.”

Lightweight landing gear for low maintenance aircraft

In addition to the optimized D-Seal design, Trelleborg Sealing Solutions has recently presented a new composite material for the aircraft industry: Orkot C620, as it is called, is designed specifically to enable the construction of particularly light and at the same time extremely strong and therefore long-lasting landing gear. According to Trelleborg, the composite material improves the aircraft’s energy efficiency, which also requires less maintenance. Last but not least, this increases sustainability, the company emphasizes.

Experimental setup of a small laboratory scale fuel cell as used for research purposes.  (Image: Frenzelit GmbH)

Particularly durable – and light at the same time. The new material combines these two properties and is therefore recommended as an alternative to metal in the construction of special sliding bearings in the chassis area. The components can thus be designed smaller and lighter; take-off weight is reduced, which saves fuel.

Reduces friction and wear

Orkot C620 is a composite material that combines glass fibers with a low-friction TX Orkot base. Trelleborg Sealing Solutions guarantees the material high durability without delamination. The properties of the different layers increase load capacity and strength while reducing friction and wear. This enables longer maintenance intervals.

In addition to these properties, the new material is characterized by a low coefficient of friction and at the same time withstands high loads, explains Trelleborg in a press release. This minimizes the stick-slip behavior. This creates less dynamic and static friction, enabling safer high-load movements and ensuring smooth operation of the landing gear during takeoff and landing.

The impact strength of 200 KJ/m² predetermines Orkot C620 for applications with extreme loads. The material has a bending strength of 320 megapascals, giving it versatility and durability. In addition, it remains flexible and elastic enough to return to its original shape and dampen vibrations.

minimize weight

Torben Andersen, Director Aerospace Segment at Trelleborg Sealing Solutions, says: “The aviation industry is in constant development. A long-term trend is the use of new, sustainable materials and solutions that reduce weight without compromising performance or durability. While the Orkot C620 is suitable for a variety of aircraft components, it is specifically designed to meet the needs of landing gear. This is where the material can play to its full strengths.”

When it comes to seals, it is not only the material that is decisive: the shapes, geometries and material combinations of the seals must also be precisely adapted depending on the specification.  (Creams)

Brian Bowen, Engineering Specialist Dynamic Seals, adds: “The high stress and low weight of the composite makes it possible to replace standard metal components in the landing gear, thereby reducing weight. This will enable aircraft manufacturers to produce lighter and more fuel efficient aircraft.” The components can ultimately be made smaller, which also saves space. Surrounding parts can also be made smaller due to a lower moving mass, further reducing the aircraft’s weight.”

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