Machine element or mechanism – Gearing
Patent
1980-10-31
1984-01-17
Murtagh, John E.
Machine element or mechanism
Gearing
74804, 74805, F16H 3300, F16H 128
Patent
active
044258224
ABSTRACT:
One embodiment of a harmonic-drive device insertable, e.g., into a clutch housing having elevated fluid pressures comprises a cup-shaped member with a flexible cylindrical inserted in a casting and rigidly connected thereto, the cup member bearing at its end a pair of substantially cylindrical supports in which a drive shaft is rotatably journaled. The shaft bears a mechanical wave generator which deforms the middle portion of the cup wall into an elliptical cross-section, whereby splines on opposites sides of the cup wall are shifted to mesh with inwardly projecting teeth of a pair of rings, one ring having teeth greater in number than the splines and being attached to a motion-output component rotatably and slidably secured to the cup casing. The supports in the cup are tapered to a minimum diameter at their inner ends substantially equal to the minor axis of the elliptical cross-section. In another embodiment of the device, the wave generator and the supports are formed as an enlargement of the drive shaft provided on a outer surface with ribs or sealing stripes subdividing the surface of the enlargement into a matrix of compartments.
The cross-section of the shaft enlargement varies from circular at the ends to elliptical in the center and the compartments are connected to a hydraulic circuit for being pressurized by a lubricating fluid.
REFERENCES:
patent: 3918326 (1975-11-01), Kida et al.
patent: 3996816 (1976-12-01), Brighton
patent: 4237751 (1980-12-01), Davis
Gear Handbook by D. W. Dudley, 1962, pp. 37-44, published by McGraw Hill Book Co., Inc., New York.
Heinemann Fritz
Marschner Heinz
Marsland George
Dubno Herbert
Murtagh John E.
Ross Karl F.
Rudy Andrew Joseph
Zahnradfabrik Friedrichshafen AG
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