Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission...
Patent
1999-06-14
2000-04-04
Estremsky, Sherry L.
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
475216, F16H 3702
Patent
active
060454776
ABSTRACT:
A powertrain has an engine, a multi-range continuously variable transmission (CVT) and a final drive mechanism. The CVT has a continuously variable unit (CVU) and a planetary gear set. A plurality of friction devices that are selectively connectable to establish three forward ranges and one reverse range wherein the CVU is effective to provide infinitely variable ratios between the engine and the final drive mechanism. One friction device is engaged during a geared neutral condition, a first forward range and a reverse range. The neutral condition is established by setting the CVU at a predetermined ratio. The reverse range is operated by changing the CVU ratio toward a maximum underdrive ratio from the neutral condition and the first forward range is operated by changing the CVU ratio toward a maximum overdrive ratio. The second and third forward ranges are established by synchronously interchanging friction devices.
REFERENCES:
patent: 5564998 (1996-10-01), Fellows
patent: 5888160 (1999-03-01), Miyata et al.
patent: 5931760 (1999-08-01), Beim et al.
Ellis Dean L.
Estremsky Sherry L.
General Motors Corporation
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