Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural drive ratios other than unity
Reexamination Certificate
2005-03-01
2005-03-01
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
C475S275000, C475S280000, C475S295000
Reexamination Certificate
active
06860831
ABSTRACT:
The invention relates to a multi-stage reduction gear by which at least seven speeds can be shifted. Apart from the input shaft (1) and the output shaft (2), the gear consists of a non-engageable upstream gear and an engageable downstream gear in the form of a gear with two fixed links and four shafts. The upstream gear consists of a first planetary gear (3) which, next to the input RPM of the input shaft (1), also provides a second RPM which can be shifted alternatively via a downstream gear. The downstream gear consists of two engageable planetary gears (4, 5) which, with of six shift elements (A to F), can generate a minimum of seven forward speeds, whereby two output paths are formed (P, Q). Thereby, series shifts are always avoided for each shift action.
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Davis & Bujold P.L.L.C.
Lewis Tisha
ZF Friedrichshafen AG
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