Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural drive ratios other than unity
Reexamination Certificate
2005-08-09
2005-08-09
Lewis, Tisha (Department: 3681)
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Plural drive ratios other than unity
C475S214000, C475S215000, C475S218000, C475S219000, C475S284000, C475S302000, C475S343000, C475S329000, C475S330000
Reexamination Certificate
active
06926635
ABSTRACT:
A multi-speed transmission with an input shaft (1) and an output shaft (2) with two spur gear speeds (ST1, ST2) that are connected tightly on the input side with the input shaft (1) and generate two output rotational speeds (n1, n2), with a main gearset that is connected with the output shaft (2) and is constructed as a two webbed four shaft transmission with two coupled, shiftable planetary gearsets (RS1, RS2) to which the output rotational speeds (n1, n2) of the spur gear speeds (ST1, ST2) are transferable through several shifting elements (A to E) through their selective closing to the clutch of at least six forward gears and can be shifted without group shifting. A total of six shifting elements (A to F) are provided. The output rotational speed (n1) of the first spur gear speed (ST1) is transferable through the sixth shifting element (F) to the second shaft of the main gearset, and at least eight forward gears and maximally two reverse gears are shiftable.
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Davis & Bujold P.L.L.C.
Lewis Tisha
ZF Friedrichshafen AG
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