Eight speed transmission with planetary and layshaft gearing

Details Eight speed transmission with planetary and layshaft gearing Eight speed transmission with planetary and layshaft gearing

2008-01-07

2010-12-28

Le, David D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Sun braked

C475S330000, C475S302000

Reexamination Certificate

active

07857726

ABSTRACT:
A transmission is provided that utilizes three planetary gear sets and three layshaft gear sets, as well as four rotating-type clutches and one brake that are engagable in different combinations to provide eight forward speed ratios between an input member and an output member of the transmission. By combining features of a layshaft transmission with those of a planetary transmission, the low spin losses and packaging convenience typical of a layshaft transmission are available while still achieving the high torque capacity typical of a planetary transmission.

REFERENCES:
patent: 7695391 (2010-04-01), Phillips et al.
patent: 2009/0054197 (2009-02-01), Wittkopp et al.
patent: 2009/0082160 (2009-03-01), Phillips et al.
patent: 2009/0082164 (2009-03-01), Wittkopp et al.
patent: 2009/0082165 (2009-03-01), Phillips et al.
patent: 2009/0082166 (2009-03-01), Wittkopp et al.
patent: 2009/0082167 (2009-03-01), Wittkopp et al.
Prof. Dr.-Ing. Peter Tenberge, Multi-Line Automat paper, presented at CTi Symposium Automotive Transmissions, Southfield, Michigan, Jun. 2007.
Prof. Dr.-Ing Peter Tenberge, Multi-Line Automat slide presentation, presented at CTi Symposium Automotive Transmissions, Southfield, Michigan Jun. 2007.

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