The right solution for engine downspeeding

The right solution for engine downspeeding

Engine downspeeding is growing in popularity among fleets looking to squeeze more miles out of every gallon of fuel. By reducing the RPM of the engine, especially at highway cruising speeds, downspeeding allows the engine to cruise in its sweet spot, decreasing friction and increasing fuel efficiency. Current technology allows downsped engines to deliver a fuel savings of nearly $2,200 per truck every year.

An engine running at lower RPMs requires faster axle ratios to maintain the same vehicle speed and performance in all driving conditions, which generates significantly higher torque stresses in the drivetrain. Torque loads in the driveline increase by 57% when the engine’s RPM at cruise speed is reduced from 1,450 RPM for the typical engine to 1,125 RPM for a downsped engine.

Dana Holding Corp. recommends a tandem axle incorporating numerous innovations to improve performance in a high-torque environment, including:

  • More capable primary gear, achieved through wider face gearing with longer tooth length for lower contact and bend stress; and rigid ring gear mounting that eliminates joint loosening;
  • More capable input shaft and pinion splines;
  • More capable input and pinion bearings; and
  • Faster ratios to match intended operating speeds.

The other piece of this solution is a driveshaft and inter-axle shaft engineered to maximize the efficiency and durability of the tandem axle with:

  • A larger U-joint cross engineered for high strength;
  • Larger bearings with greater capacity; and
  • A high-density package to fit within the existing design envelope.

The trend toward engine downspeeding is gaining momentum and the key to ensuring the greatest return on your investment is a durable, reliable driveline solution.

You May Also Like

Peterbilt delivers Model 520EVs to Waste Connections of New York

Peterbilt says the Model 520EV can fully charge within 3 hours, and handle 1,100 trash bins on a single charge.

Peterbilt-Model-520EVs-Delivered-to-Waste-Connections-of-New-York

Peterbilt delivered two Model 520EVs to Waste Connections of New York, Inc., a solid waste and recycling services provider based in New York City. The vehicles, which the company said will be used for residential trash collection in the Bronx, are part of the company's efforts to lower carbon emissions.

Trucking through the heat: Why battery performance matters more than ever

Extreme temperatures can hurt battery performance and pose safety risks. Dragonfly says the answer lies in different battery chemistry.

Dragonfly-Battle-born-battery-APU-installed-driver
Navigating fluid options to raise efficiency and reduce downtime

ICE technology is changing, and Valvoline and Cummins say oil plays an important role in your fleet’s efficiency and uptime.

Valvoline-Cummins-oil-ICE-changes-webinar
FTR’s Shippers Conditions Index rises to 3.0 in April

The company predicts some rating deterioration in the months ahead, but doesn’t expect the SCI to dip into the negatives.

FTR-April-24-Shippers-Condition-Index
Volvo electric trucks pass milestone with more than 80,000,000 km driven

Compared to diesel-powered trucks, Volvo said its electric trucks have reduced CO2 emissions by 68,000 tons since 2019.

Volvo-electric-trucks-80000-km-driven
Other Posts
ZF adds PowerLine transmission course to [pro]Academy Training program

ZF says that the new course is designed to provide technicians with a deeper understanding of the PowerLine transmission.

Class 8 truck preliminary orders fall in June

While down both m/m and y/y, FTR said order levels are in line with historical averages and seasonal expectations.

FTR-June-24-Prelim-Class-8-orders
Scania BEV trucks begin transporting goods for IKEA in Portugal

Scania said beginning an EV rollout in Portugal is challenging, as its EV infrastructure is still developing.

Scania-KLOG-IKEA-Portugal
Accelera, Daimler Truck N.A., PACCAR battery plant breaks ground

Construction is underway for the $2-3B plant, which will employ over 2,000 people. LFP Battery cell production is slated for 2027.

Amplify-Battry-plant-groundbreaking-daimler-paccar-accelera-1