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MotoGP transmissions

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The latest transmission development in the top flight of motorcycle racing, MotoGP, has been the appearance of seamless shift technology. Already commonplace in Formula One, seamless shifting provides a number of benefits to the rider and, more important, helps reduce lap times. Honda is currently the only team on the grid to admit to using a system, and it certainly made an impact on its debut at the Sepang pre-season tests in 2011. Honda Racing's Shuhei Nakamoto said at the time,...

Le Mans transmission

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Le Mans places abnormal demands on almost every component in a racecar, with the suspension and engine taking a relentless pounding on every lap of the 13.629 km circuit. Also subject to the same war of attrition is the gearbox and driveline. In the past, gearboxes were a regular source of problems for competitors, either thanks to simple fatigue failures of parts, or driver fatigue leading to missed gearshifts. In recent years, transmission problems have become far less commonplace; this...

WRC rally transmissions

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With the exception of off-road racers competing in events such as the Dakar Rally, it is unlikely that any type of competition vehicle is required to deal with as varied a range of conditions as a WRC rally car. Ten years or so ago, WRC cars were far removed from any other type of current rally machinery, but with introduction of new rules in 2006 and Super 2000-based regulations in 2011, the complexity of the designs manufacturers can employ has been greatly reduced. In relation to...

Carbon-carbon composites in clutches

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It is common to see composite materials in a range of applications in motorsport. Typically glass- and carbon fibre composites reinforced within a polyester or epoxy matrix not only lend themselves to the manufacture of complex shapes but also allow engineers to incorporate both isotropic and anisotropic mechanical properties into a single structure. As with all composite materials, the constituents' properties and the positioning of both the reinforcement and matrix material will...

DLC in transmission components

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In order to reduce stress and improve mechanical performance for any highly loaded powertrain component, surface finish is of the utmost performance; a superior surface improves fatigue resistance by removing potential stress raisers and the possibility of crack propagation. For geartrain components this is especially important, requiring high surface hardness to maintain impact strength and resist bending loads on the gear teeth, even though most of the gear material itself must exhibit...
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