Planetary transmission, especially dual-clutch planetary...

Details Planetary transmission, especially dual-clutch planetary... Planetary transmission, especially dual-clutch planetary...

2005-03-22

2009-12-29

Lewis, Tisha D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S303000, C074S330000

Reexamination Certificate

active

07637840

ABSTRACT:
A dual clutch planetary transmission (1) having at least four planetary gear sets (P1to P4), at least two frictional shifting elements (K1, K2) for the shifting into different power paths in a power flow, and a plurality of shape-fit, shifting elements (A, B1, B2, D, E1, E2, F) for the attainment of various ratio stages for the power paths. The frictional shifting elements (K1, K2) and the shape-fit, shifting elements (A, B1, B2, D, E1, E2, F) are so positioned between shafts (S1, ST1, HR1, S2, ST2, HR2, S3, ST3, HR3, S4, ST4, HR4) of the planetary gear sets (P1to P4), a housing (2), a transmission input shaft (3) and a transmission output shaft (4) that gear stage change, at least in a lower gear range (1to6), can be accomplished free of interruption in traction. At least one of the frictional shifting elements (K1, K2) is a clutch. Further, the second planetary gear set (P2), the third planetary gear set (P3) and the fourth planetary gear sets (P4) form a 3-carrier-5-shaft transmission apparatus with separate planetary gears (PR2to PR4), via a double planetary gear, without intermediate stages.

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