| 摘要 |
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. |
