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 Geared motor

Details
Inventors: Seidou, Yoshio;
Assignee:
Primary Examiner: Budd; Mark O.
Assistant Examiner:
Attorney, Agent or Firm: Lyon & Lyon

A geared motor employing a brushless induction motor in nested arrangement, either concentrically inwardly or concentrically outwardly, with a gear reduction device employing two gear wheels, one with interior teeth and one with exterior teeth, said teeth being meshed together. The difference in the number of teeth is small relative to the total number of teeth of each gear wheel. One of the two gear wheels moves in an eccentric path, is free to rotate relative to the rotor but is driven thereby. The other gear is fixed relative to the housing. An output accommodating the eccentric movement of the free gear derives reduced rotational speed and torque from the system.

DETAILED DESCRIPTION The present invention is directed to a geared motor to effect motor driven speed reduction in a compact and efficient manner.
In a first separate aspect of the present invention, a motor is concentrically arranged with a gear reduction device.
The rotor includes an eccentric cylindrical surface to drive a speed reduction mechanism including a gear having two gear wheels, one being a ring gear with internal teeth and the other having external teeth and being located within the ring gear.
The two gear wheels have different numbers of teeth.
In a further separate aspect of the present invention, the aforementioned geared motor has all of the eccentric surface, the ring gear having the interior teeth and the gear wheel nested with the stator and rotor of the motor so as to provide a thin profile.
In yet another separate aspect of the present invention, the gearing may be inwardly concentric or outwardly concentric in a nested arrangement with the motor.
Accordingly, it is an object of the present invention to provide an improved motor driven speed reduction mechanism.
Other and further objects and advantages will appear hereinafter.


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