Two new 4 X 4 drivetrain systems have been developed for highway tractors that are used to pull multiple trailer combinations. The first one is a 4 X 2 that automatically becomes a 4 X 4 when conditions exist that require 4 X 4 operation. The second one is a full-time 4 X 4 that proportions the drive torque 36% to the front axle and 64% to the rear axle.A unique front driving steering axle has also been developed that permits a 4 X 4 system to be installed in a standard 4 X 2 truck. There is no need to relocate any major components to make space available for a front driving steering axle.
4 x 4 Highway Tractor Concepts
Sae Technical Papers
National Commercial Vehicle Engineering and Operations Meeting ; 1972
1972-02-01
Conference paper
English
Engineering Index Backfile | 1954
Large-traction highway-railway dual-purpose tractor and railway tractor train method
European Patent Office | 2023
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