Adjustable transmission
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United States of America Patent
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-
Aug 15, 1989
Grant Date -
N/A
app pub date -
Feb 26, 1988
filing date -
Mar 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In known combinations of a planetary gear transmission with a continuously variable friction drive transmission, unsatisfactory accuracy in operation and excessive overall dimensions are found to be disadvantageous. The transmission according to the invention comprises a planetary gear transmission (11) operatively connected to a continuously variable friction drive transmission (12) with spherical rolling members (19). The transmission according to the invention is finely or infinitesimally adjustable over a wide range of positive or negative transmission ratios and particularly suitable for employ in a closed control system.
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