| 摘要 |
FIELD: drill equipment. SUBSTANCE: lower portion of the shaft is reinforced with a sleeve fitted snugly to the shaft up to the shoulder and additionally jammed from above by rotor nut together with turbine rotors and other parts. The sleeve prevents shaft end projected from nipple (screwed in the case) from bends and breaks. EFFECT: as this takes place diameter of shaft workpiece and metal wasting to chips decreases. 1 dwg |
