Hydrostatic split-type multi-speed power transmission
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United States of America Patent
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Jul 14, 1992
Grant Date -
N/A
app pub date -
Jul 8, 1991
filing date -
Jul 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.
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