Multi-stage automatic gearbox

Details Multi-stage automatic gearbox Multi-stage automatic gearbox

2005-08-08

2009-12-08

Ho, Ha D. (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

07628723

ABSTRACT:
A multi-speed automatic transmission comprises a drive input shaft (AN), a drive output shaft (AB), a double planetary transfer gearset (VS), a main gearset (HS) made as a coupled planetary gearset with at least three non-coupled input elements and one output element, and six shift elements (A to F), which, when engaged in pairs, enable at least eight forward gears to be engaged. An input element of the transfer gearset (VS) is connected with the drive input shaft (AN). An output element of the transfer gearset (VS) rotates at a speed slower than the input speed of the drive input shaft (AN). An element of the transfer gearset (VS) is fixed on a transmission housing (GG). The first input element of the main gearset (HS) can be connected via a second shift element (B) to the output element of the transfer gearset (VS), can be fixed by a third shift element (C), and can be connected with the drive input shaft (AN) by a sixth shift element (F). The second input element of the main gearset (HS) can be connected via a first shift element (A) to the output element of the transfer gearset (VS). The third input element of the main gearset (HS) can be fixed by a fourth shift element (D) and can be connected by a fifth shift element (E) to the drive input shaft (AN). The output element of the main gearset (HS) is connected to the drive output shaft (AR). The sixth shift element (F) is arranged axially between the transfer and main gearsets (VS, HS). A servomechanism (210) of the second shift element (B) is arranged mainly on the side of the transfer gearset (VS) facing away from the main gearset.

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