Patent ID: 6044721
Filing Date: 2000-04-04
Classification: F16H,Y10T

Abstract:
A compound vehicular transmission system (10) comprising:a compound splitter-type mechanical transmission (16) having an input shaft and an output shaft, said transmission having a shift-lever-shifted, non-synchronized main transmission section (16B) connected in series with a splitter-type auxiliary section, said main transmission section defining a plurality of selectable ratios engageable by non-synchronized, non-blocked jaw clutches comprising first and second arrays of interengageable clutch teeth, said first and second arrays interengageable clutch teeth having a pitch diameter of at least 2.5 inches and defining a backlash exceeding 0.020 inches, said auxiliary transmission section (16E) interposed between said main transmission section (16A) and said output shaft (20);a splitter actuator (46) for selectively causing said splitter section to be shifted into a selected one of a first splitter ratio (low), a second splitter ratio (high), or a splitter-neutral (N) position, anda controller (48, 36) for receiving input signals (68) and processing same according to logic rules to issue command output signals (70) to system actuators including said splitter section actuator (44), said logic rules including rules for sensing a shift into a main transmission section ratio and into main transmission section neutral and effective, upon sensing a shift into main transmisison section neutral, to cause said splitter to be shifted into the splitter-neutral position.