Seven speed transmissions with all positive rotation components in forward speeds
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United States of America Patent
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-
Dec 25, 2007
Grant Date -
Mar 29, 2007
app pub date -
Sep 23, 2005
filing date -
Sep 23, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Seven speed transmissions are provided that include four planetary gear sets having six torque-transmitting mechanisms with various fixed interconnections to provide seven forward speed ratios and three reverse speed ratios. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another of the planetary gear members. The six torque-transmitting mechanisms are operated in combinations of two. All components rotating during forward speeds rotate in the same direction. Reduced component speeds and improved ratios are achieved.
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