Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1991-07-08
1992-07-14
Braun, Leslie A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 74, 475218, F16H 4704
Patent
active
051298678
ABSTRACT:
A power transmision with a hydrostatically branched variable-displacement gear (HG), a two-stage epicyclic gear (I, II) and a mechanical 8-speed transmission that can be operated in forward and reverse, and with a control system (ST) that triggers the clutches (VV, VR, V0-V8) of the mechanical gear means such that for starting, the variable-displacement gear (HG) is shifted unbranched to the output shaft (ASW) and the clutches are each shifted in a load-free manner, and only on shifting up to 6th gear via the clutch (K5) of the 5th gear and on downshifting to a selectable 4th gear via the 4th-gear clutch (K4) a synchronization of the intermediate shaft (ZW) is effected. Starting and reversing are done by hydrostatically; the efficiency is high; the mechanical transmission factor is approximately 60; synchronization wear is low; and there are only two synchronizing clutches (K4, K5). In a second specifiable operating mode, the mechanical gear means is controlled in a manner free of synchronization, as a 4-speed transmission with a hydrostatic starting and reversing range.
REFERENCES:
patent: 4754664 (1988-07-01), Dick
patent: 4983149 (1991-01-01), Kita
patent: 5052987 (1991-10-01), Hagin et al.
Fredriksen Nils
Mohr Jan-Hendrik
Braun Leslie A.
Claas OHG
Trousdell William O.
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