HYDRAULIC DAMPER OF DRILLING TOOL Russian patent published in 1996 - IPC

FIELD: hole drilling. SUBSTANCE: hydraulic damper of drilling tool has housing coupled to shaft to transfer torque, piston placed between housing and shaft and forming spaces above and under piston hydraulically coupled to internal space of shaft and hole space and bushing attached to shaft located above piston. Sleeve connected to shifter is inserted into space above piston and is arranged concentrically on housing. Bushing anchored on shaft is manufactured in the form of truncated cone and faces sleeve with cone surface. Duct communicating internal space of shaft with space above piston is made on side of bushing base. EFFECT: increased efficiency of damping of longitudinal vibrations emerging in drilling tool in process of its rotation in hole. 2 dwg