| 摘要 |
PCT No. PCT/EP83/00067 Sec. 371 Date Oct. 21, 1983 Sec. 102(e) Date Oct. 21, 1983 PCT Filed Mar. 8, 1983 PCT Pub. No. WO83/03119 PCT Pub. Date Sep. 15, 1983.Machine tool having a jet turbine driving a rotatable spindle with a tool holder, said spindle is comprised in a spindle housing, said jet turbine consisting of a disc-shaped turbine rotor being closely enclosed by a turbine housing, said turbine rotor having peripherally arranged discrete recesses, each recess having a concave front actuation wall for the jet and one sidewardly arranged outlet opening which opens in the axial direction of the rotor, said housing having at least one inlet nozzle for the jet directed into the recesses and having at least one outlet opening for the spent jet medium. Known machine tools suffer under strong speed losses when the load increases or varies. This disadvantage results from a constant interference between spent air within the recesses and the working jet. Thus, the energy of the jet cannot be used with good efficiency. According to the present invention the energy of the jet can be used with better efficiency, since the inlet nozzle is directed towards the deepest section of the front concave actuation wall by impacting on this wall and since there is provided a guiding path and an additional expansion space below the jet which in combination produce a pumping effect for quickly disposing the spent jet medium. The expansion space is provided by the concave rear wall and the flat bottom of the recess. The guiding path is defined by the concave side wall together with the flat bottom and the concave rear wall. |
