Six-speed powertrain and hydraulic control system for...

Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Plural elements selectively braked

Reexamination Certificate

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Details

C475S119000, C475S120000, C475S127000, C475S133000, C475S281000, C477S122000, C477S127000

Reexamination Certificate

active

06840885

ABSTRACT:
The powertrain of a six-speed powertrain and a hydraulic control system includes a main shift section of first and second single pinion planetary gearsets, in which a first planet carrier is fixedly connected to a second ring gear. The powertrain also includes a first ring gear fixedly connected to a second planet carrier, and a first sun gear. The second planet carrier, and a second sun gear are variably connected to an input shaft through first, second, and third clutches, respectively. A connecting member connecting the first ring gear and the second planet carrier is variably connected to a housing through a first brake and a first one-way clutch. The second sun gear being variably connected to the housing by a second brake. The powertrain also includes a secondary shift section realized through a third single pinion planetary gearset, in which a third sun gear is connected to a third planet carrier via a fourth clutch, and is also connected to the housing through a third brake and a second one-way clutch.

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