Pitch transfer gear and transmissions
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United States of America Patent
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-
Apr 18, 2006
Grant Date -
Apr 29, 2004
app pub date -
Feb 21, 2002
filing date -
Feb 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pitch transfer gear transmission which enables drive to be transmitted from a gear of having one modulus (42) to a gear having another modulus (46) includes at least two gears (12,16) which have a different number of teeth and which are able to rotate relative to one another, so that the teeth of the two gears (12,16) can form a gear modulus of a first value at one part of the periphery of the gear, and a gear modulus of another value at another part of the periphery of the gear. Continuously variable transmissions are formed by providing an input or output gear (42,46) which has a modulus which varies along the length of the gear. Pitch transfer gear assembly (30) engages with the input or output gear (42,46), and is moveable by a mechanism (59) along the length of the gear changing modulus, so as to set the drive ratio of the transmission.
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