Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-06-25
1992-08-04
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 50, 310 78, 475263, H02K 712, H02K 714, F16D 4320
Patent
active
051361973
ABSTRACT:
A reaction containment drive apparatus for a power tool includes a motor having an outside case free to rotate within the tool casing, and an internal drive shaft. A planetary gear set is an integral portion of the drive. It has three parts, namely, a central sun gear part, a middle planet gear part (the planet gear part having a planet carrier and preferably three planet gears on the planet carrier), and an outside ring gear part coaxial with the sun gear part and the planet carrier. The planet gear part is rotatable between the sun gear part and the ring gear part. One part of the planetary gear set is fixedly connected to the drive shaft and rotatable as a unit therewith; one part of the planetary gear set (for example, the ring gear) is fixedly connected to the outside case of the motor and rotatable as a unit therewith; and the remaining part of the planetary gear set is fixedly connected to the output shaft of the tool and forces the output shaft to rotate as a unit therewith when power is supplied to the motor. The reaction containment drive contains reaction forces within itself and prevents such forces from being transmitted from the output shaft to the tool.
REFERENCES:
patent: 4375047 (1983-02-01), Nelson et al.
patent: 4528470 (1985-07-01), Young et al.
patent: 4614134 (1986-09-01), Bohle
patent: 5027023 (1991-06-01), Koivikko
patent: 5080642 (1992-01-01), Takami
Rebsch D.
Stephan Steven L.
White Douglas E.
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