4-MODE POWERSPLIT TRANSMISSION BASED ON CONTINUOUSLY VARIABLE PLANETARY TECHNOLOGY
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United States of America Patent
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Issued Date -
Jun 1, 2017
app pub date -
Jun 26, 2015
filing date -
Jun 27, 2014
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Abstract
A variable transmission includes a powerpath layout based on multi-mode operation. The various modes are a combination of direct drive or power recirculation. An Infinitely Variable Planetary mode is present, allowing powered neutral feature. In all the modes, the Continuously Variable Planetary is speeded up with a single gear ratio, with the objective of reducing the Continuously Variable Planetary size by running it at high revolutions per minute. This configuration is based on a four mode solution, each mode being selected by closing a clutch/brake and releasing the others. A “common sun” compound planetary is the central part of the configuration together with the Continuously Variable Planetary. The configuration incorporates two forward modes consisting of a powersplit high-speed and direct drive mid-speed, a reverse direct drive mode and a powersplit infinitely variable planetary mode for low positive and reverse speeds as well as a powered neutral mode.
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