Hollow Drive Gear Reduction Mechanism

A hollow drive gear reduction mechanism comprising:

• a hollow wave generator with a wave generating section formed at one end thereof, the wave generating section being formed with an elliptical recess;
• an annular flexible bearing disposed in the elliptical recess of the wave generator in a manner that an outer surface of the outer ring is abutted against an inner surface of the elliptical recess, and the annular flexible bearing is driven to rotate by the elliptical recess;
• a flexible wheel with an inner toothed section formed at one end thereof, the inner toothed section being provided on an inner surface thereof with a plurality of inner teeth, and the flexible wheel being inserted in the annular flexible bearing and having an outer surface abutted against an inner surface of the inner ring, and the flexible wheel being driven to rotate by the annular flexible bearing;
• and
• a rigid wheel provided on an outer surface with a plurality of outer teeth, and the outer teeth being different in number from the inner teeth of the flexible wheel, the rigid wheel being inserted in the flexible wheel in a manner that a part of the outer teeth are meshed with the inner teeth.