Automatic UltraShift reaches new speeds

Eaton Roadranger
Continuing the trend in automatic transmissions, Eaton Corp. has recently introduced the Eaton Fuller UltraShift 10-speed, a fully automated heavy-duty truck transmission that provides fully automatic, two pedal operation. A follow-up to the UltraShift 6-speed medium-duty model introduced in 2001, the UltraShift 10-speed is based on the “B” ratio transmission and is offered in four torque capacities from 1,050 to 1,650-pounds-feet. The 10-speed is currently in its “LQR” phase (limited quantity release), with an initial production quantity of 1,000 over the next year and full production in 2004.

Key features include: an automatic start with no clutch pedal that helps to reduce drivetrain abuse; automatic shifting that permits the driver to keep both hands on the steering wheel; computer-controlled shifts, made at ideal engine speeds for improved efficiency and performance; “Skip-shifting” provided as operating and load conditions allow, for optimum performance and fuel efficiency; a patented automated mechanical Eaton Fuller “DM AutoClutch” that uses a time-tested 15.5-inch, two-plate design with industry-standard ceramic facing material; a high capacity inertia brake that speeds automated up-shifts, and serves as a clutch brake; and clutch-less “float shifting” between gears, eliminating hundreds of clutch actuations per day and providing extended clutch life, the company says.

The transmission allows drivers to use the transmission in full automatic mode or with manual intervention, depending on conditions or driver preference. A manual mode holds the current gear and allows driver-selected up-shifts or down-shifts. The low mode feature can be used in any gear to prevent the transmission from up-shifting, and initiates downshifts to optimize engine braking performance. Low mode can also be used to select first gear at a standstill, and will hold in low until drive mode is selected.