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Oerlikon Graziano to show H-RAM modular hybrid rear axle for P3 and P4 applications

Leading gear and drive solutions provider Oerlikon Graziano, together with Vocis, will show its latest hybrid and electric technologies at the forthcoming CTI Symposium 2018 in Berlin. Heading the product line-up will be H-RAM, the company’s hybrid rear axle module, which will also be detailed in a technical presentation.

H-RAM is a compact and highly integrated design that can be configured as a P3 motor arrangement or a stand-alone P4 electric axle. It combines the propshaft input from a conventional powertrain with an electric motor connected through a two-speed planetary drive and incorporates the final drive and differential which may be open, or featuring a mechanical or electronically controlled LSD.

In the P3 arrangement, tests by Oerlikon Graziano have shown efficiency gains of up to 8% compared to a P2 architecture, when running the WLTP cycle in EV mode.

The compact size of H-RAM enables OEMs to package a complete hybrid system within the subframe of the rear axle without modification of the standard ICE powertrain, a considerable advantage for vehicle platforms that are shared between hybrid and non-hybrid models.

The P3 configuration with planetary gearing enables efficient running in pure EV mode and the capability of very strong e-Boost at low speeds in a high gear, enhancing the performance feel of the vehicle.

The descriptive technical presentation traces the evolution of H-RAM, based on experience from OGeco, the company’s electrified high performance DHT solution, then explains the technical details and specification of the unit, including performance data, and outlines current development status.

The first application of the unit is in a high-performance vehicle with peak wheel torque of 12,000 N·m in hybrid mode and a potential maximum speed in E-mode of more than 300 km/h (186 mph).

In addition to H-RAM and OGeco, Oerlikon Drive Systems will display its EMR3 single-speed transmission for battery electric vehicles, its 4SED 4-Speed, twin-motor, electric drive and modular transmissions for 48V and high voltage hybrid applications.



Twelve THOUSAND Newton-meters at 300 km/hr?!  What are they driving with this thing, high-speed rail cars?

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How about an electric Lamborghini Terzo Millennio.

CTO Maurizio Reggiani told Automotive News that said a Lamborghini EV should exceed a 186-mph top speed and provide enough juice for three full laps of the Nürburgring.

Oerlikon Graziano transaxles are standard in the cars produced by Aston Martin, Ferrari, Lamborghini, Maserati, McLaren, Audi and some of the most recently announced new cars.

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An earlier GCC post on 12-05-14 and an SAE article ( discuss the OGeco unit in more detail. Not much yet on the H-RAM (hybrid rear axle module).
Looks like this tech could expand hybrid and plugin tech to a wide variety of vehicles including high performance vehicles(the SAE article describes converting the Mercedes 435-kW (583-hp) V8 SLS AMG to hybrid) or large trucks/SUV.

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