|Next-generation CVT. Click to enlarge.|
Nissan Motor Co., Ltd., and its affiliate transmission supplier JATCO Ltd. have jointly developed a new generation of compact and lightweight continuously variable transmissions (CVTs).
The next-generation CVT design features an innovative structure combining conventional CVT belt operation with an auxiliary gearbox and a significantly increased gear ratio range. The new CVT is scheduled to appear in compact Nissan vehicles worldwide in the near future.
Major features of the new CVT are:
High transmission ratio for quicker starts and acceleration. The new structure raises the available transmission ratio from current 6.0:1 to 7.3:1, more than 20% higher than other CVTs, for enhanced responsiveness on starting and acceleration. The 7.3:1 ratio is higher than the average conventional 7-speed automatic transmissions used on high-displacement engine-equipped vehicles, making it among the world’s highest ratios for production vehicle use (excluding DCTs and manual transmissions).
Compact and lightweight. This CVT configuration combines a belt-operated CVT with an auxiliary transmission, shortening its overall length by 10% and reducing weight by 13% compared to conventional CVTs in its class.
Drivability. The next-generation CVT features the Adaptive Shift Control (ASC), which improves performance by automatically selecting the best ratio for startup, acceleration and uphill or downhill driving.
Nissan believes the CVT has very good potential as a leading technology for raising the fuel efficiency of internal-combustion engine systems. Nissan first began applying CVT technology in 1991 and has been continuously evolving CVTs, engine-cooperative management and other systems, and expanding their use in Nissan vehicles. The need to improve fuel economy, with the resulting reductions in CO2 emissions motivated us to step up our efforts in the joint development with JATCO of this next-generation CVT.—Shuichi Nishimura, corporate vice president, Nissan Powertrain Engineering Division
JATCO, the world’s leading CVT manufacturer, uniquely offers a full range of CVTs for applications from mini-vehicles up to 3.5-liter V6-equipped cars. The company produces 43% of CVTs made globally.
The revolutionary structure of the next-generation CVT, with its auxiliary transmission, not only raises the transmission ratio, reduces weight and adds fuel efficiency, its compact design also expands its applicability to a broader range of vehicles. We believe it is an excellent choice for automakers seeking to raise the fuel efficiency of their smaller cars.—Yo Usuba, vice president, JATCO
Nissan and JATCO have achieved sales of 1 million CVT-equipped vehicles, as well as introducing 7-speed automatic transmissions to improve fuel efficiency.