Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Brake or clutch on surface of helically coiled member
Patent
1995-02-16
1996-11-12
Ta, Khoi Q.
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
Brake or clutch on surface of helically coiled member
192 4892, F16D 4312, F16H 510
Patent
active
055734723
ABSTRACT:
A down shift mechanism for incorporation in a device such as an assembly tool includes a wrap spring which locks and releases a planetary gear speed reduction assembly to provide shifts between two drive ratios in response to torque throughput. The wrap spring is received upon a drive drum within a cylindrical housing. The ends of the wrap spring are engaged by a pair of relatively rotationally adjustable and fixable spring engaging lugs which adjust the preload of the wrap spring and thus the torque level at which the spring unwraps and lifts off the drive drum and at which the shift occurs. The wrap spring housing is coupled to the ring gear of the planetary gear assembly. When the torque applied to the wrap spring exceeds the preload, the spring unwraps, unlocking the ring gear and planetary gear assembly and downshifting to the speed reduction determined by the planetary gear assembly. An alternate embodiment of the downshift mechanism is also presented.
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