F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/167
F16H 61/02 (2006.01) F16H 59/08 (2006.01) F16H 61/688 (2006.01)
Patent
CA 1195860
ABSTRACT OF THE DISCLOSURE Disclosed is an automatic control system for a powershift, preselect transmission (10) includ- ing a plurality of power paths (36, 38) alternately connectable between input (12) and output (20) shafts by first engaging selected ones of synchronizer clutches (42, 74, 84) associated with each of a plurality speed ratio gears (44, 46, 76, 78, 80) in each path and then alternately engaging a powershift clutch (48, 82) associated with each path. The control system includes a hydraulic logic system (118) which may be electronic and a hydraulic and shift valve system which may be electrically control- led should the logic be electronic. The control system preselects ratio gears in a nondriving path and then alternately engages the powershift clutches to switch driving connections from one path to the other. The logic system includes an improved reverse sequence valve (132) and improved shift valves (124, 126, 128). The shift valve system includes the feature of trimmer valves (364, 370, 372, 374) to control the engagement rate of the synchronizer clutches and combination trimmer valves (360, 366) to control the engagement rate of the powershift clutches. The logic system further includes the feature of a reverse sequence valve (132') for preselecting reverse as a function of speed and independent of the shift selector position.
417779
Corporation Eaton
Macrae & Co.
LandOfFree
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