Harmonic drive mechanism of wave generator

A harmonic drive mechanism of a wave generator, comprising:

• a first bearing set;
• an input shaft;
• a left end cover;
• a second bearing set;
• an output shaft;
• a key;
• a bolt assembly;
• a vibratory hydraulic wave generator assembly;
• a rigid internal gear sleeve;
• and
• a flexible external gear;
• wherein an oil discharge outlet is provided at a bottom of the rigid internal gear sleeve;
• the left end cover covers an opening of the rigid internal gear sleeve, and is fixed to the rigid internal gear sleeve by a fastener;
• the input shaft which is rotatable is provided on the left end cover through the first bearing set;
• a part of the input shaft and the flexible external gear are located in the rigid internal gear sleeve;
• the output shaft which is rotatable is provided on the rigid internal gear sleeve through the second bearing set;
• an end of the output shaft is connected to the flexible external gear via the key;
• the vibratory hydraulic wave generator assembly comprises a casing, a vibrating plate, a backing plate and a check valve which are located in the flexible external gear;
• and the casing and the flexible external gear are in clearance fit and are relatively movable;
• a central oil hole is provided at an axis of the input shaft;
• a radial hole is provided at an end of the input shaft;
• the check valve is provided in the radial hole;
• the central oil hole communicates with an inlet of the check valve;
• the backing plate is fixed at the end of the input shaft, and the vibrating plate is fixed on the backing plate;
• the casing is fixedly connected to the end of the input shaft via the bolt assembly;
• the vibrating plate and the backing plate are located in a cavity of the casing;
• a gap is provided between the vibrating plate and an inner wall of the casing;
• a center hole of the vibrating plate communicates with an outlet of the check valve via a center hole of the backing plate, and further communicates with the cavity of the casing;
• when energized, the vibrating plate vibrates at a high frequency in a thickness direction;
• the casing is provided with a radial hole through which the cavity communicates with an exterior of the casing;
• and the flexible external gear meshes with the rigid internal gear sleeve.