The Effect on Driveline, Transmission, and Engine 640626

This is a study of driveline torque associated with re-tarders when used as a means of controlling vehicle downhill speed. Using two commercially available retarders for field testing, the working principle and driving method for each is briefly explained. Data compiled from field tests is summarized in chart form providing a direct comparison between ascending driveline torque and the torque imposed on the driveline when descending the same hill, using a hydraulic driveline retarder, an engine retarder, or service brakes. The resulting comparison provides the basic guide for the design and evaluation of present components used in conjunction with retarders.


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