Hydromechanical steering transmission with improved high range speed performance

摘要

To increase the top speed of a multi-speed range hydromechanical steering transmission for tracklaying vehicles, the displacements of the hydraulic motors (18,24) in the two hydrostatic drive units (12,14) are abruptly destroked from 100% displacement to 80% displacement at the moment the infinitely variable displacements of their respective hydraulic pumps (16,22) achieve zero displacement during acceleration through the highest forward speed range of the transmission (32).