Transmission specialist Oerlikon Graziano is showcasing its range of hybrid and electric transmission systems, including the OGeco torque infill unit that integrates a 6-speed automated manual with a 120 kW electric motor through a 2-speed epicyclic transmission, as well as a new 2-speed automated manual drive system, at the the 2014 CTI Symposium and Transmission Expo in Berlin next week.
The OGeco unit provides torque infill, electric boost, regeneration, electric drive and engine cranking. A prototype unit has been installed in a Mercedes-Benz SLS AMG by Oerlikon Graziano and its UK partner, Vocis. The packaging is so effective that the OGeco with integrated electric motor fits into the same space as the 7-speed DCT normally fitted to the car.
|The OGeco unit is designed to provide torque infill form an electric motor during gear changes. Click to enlarge.|
Currently suitable for front-engined and mid-engined cars with either four-wheel drive or rear-wheel drive, the OGeco concept is sufficiently flexible to be adapted to transverse transaxles in the future, the company said.
Oerlikon Graziano will also be showcasing three electric transmission systems, developed by the company in response to the increasing demands for more efficient energy use and emissions reduction.
The 2SED (2-speed electric drive) is a dual-speed seamless-shifting transaxle that can be coupled with a transverse electric motor, for front or rear full electric axle application. Maximum power is from 70 to 110 kW, maximum torque from 250 to 300 N·m, and maximum speed is from 8000 to 12000 rpm.
The gearbox features a double stage reduction, with a first total reduction ratio of 1:10.1 to 1:11.36 and thesecond total reduction ratio of 1:4.46 to 1:5.51.
The 4SED is a dual-motor, 4-speed, lightweight transmission that features increased efficiency and seamlessly smooth shifting. A compact, scalable design makes it suitable for a wide range of vehicle types, including electric passenger or commercial vehicles or high-performance, four-wheel drive hybrids.
Oerlikon has developed several versions of the 4SED, one a high-performance RWD unit in which each motor delivers 125 kW, with a maximum speed of 10000 rpm and maximum torque of 240 N·m, for a combined 480 N·m. Gear ratios are: I=2.483; II=1.659; III=1.178; IV=0.894; FDR=4.000.
Oerlikon also has prototyped 4SED units equipped with dual 25 kW or 35 kW motors for front or rear wheel drive, with maximum torque of 64 N·m and 75 N·m each, respectively. Gear ratios on these units are I=4.130; II=2.806; III=2.026; IV=1.408; FDR=4.913.
RWD 4SED. Click to enlarge. FWD, RWD 4SED. Click to enlarge.
A new, 2-Speed Automated Manual Transmission was developed as part of an EU-supported €5.3-million research project called AVTR (Optimal Electrical Powertrain via Adaptable Voltage and Transmission Ratio), which runs through next April. AVTR addresses the development of a complete electrical powertrain optimized as a whole of systems, and targeting vehicles weighing less than 1,000 kg (2,200 lbs).
The main target of AVTR is to design and prototype an innovative compact axle integrating e-motor, inverter, gearbox, and corner (wheel, suspensions and braking system), and to test it on a 4WD micro eV. Click to enlarge.
Used singularly, the new AMT offers EVs the advantages of multispeed transmissions and if applied to two independent axles it makes the vehicle AWD while at the same time allowing seamless shifting.