PNEUMATIC GRINDING TOOL Russian patent published in 1998 - IPC

FIELD: mechanical engineering. SUBSTANCE: tool body houses nozzle apparatus, microturbine made as shaft mounted in gas bearings and at least one disc with profiled blades positioned on shaft. Tool body also includes two-sided thrust gas bearing, pivots of which are represented by working wheel disc, and starting valve. Nozzle is provided with profiled blades. Their peripheral end-faces are tapered, and they adjoin internal surface of body with formation of channels narrowing in direction of microturbine disc. Profile of every disc blade in central part is determined by circle arcs coupled to circle arcs on input and output edges with straight lines. Dimensions of elements of microturbine and gas bearings are correlated in definite order. EFFECT: higher efficiency, higher torque on turbine output shaft, extended zone of shaft stable operation. 5 dwg