Drive For a Grinding Spindle

Abstract

The invention relates to a grinding-spindle assembly comprising a fixed shaft and a ring motor that has a stator and a rotor, wherein the stator is connected in a fixed fashion to the shaft, the rotor is a hollow shaft and is pivotal on the fixed shaft, and the grinding tool is connected in a rotationally fixed fashion to the rotor, and the ring motor extends through the grinding tool. The fact that the grinding tool is mounted directly on the rotor produces an especially space-saving construction.

1 . A grinding-spindle assembly comprising a rotationally driven grinding tool and a ring motor, wherein
 the ring motor has a stator and a rotor,   the stator is held in at least one bearing block,   the rotor is a hollow shaft and is pivotal,   the grinding tool is connected to the rotor in a rotationally fixed manner,   characterized in that   the rotor extends through the grinding tool.   
   
   
       2 . The grinding-spindle assembly according to  claim 1  wherein the stator has an electrical coil, and the rotor has permanent magnets. 
   
   
       3 . The grinding-spindle assembly according to  claim 2  wherein the permanent magnets are mounted on an inner periphery of the rotor. 
   
   
       4 . The grinding-spindle assembly according to  claim 2  wherein the stator and the permanent magnets are mounted at least partially within a mounting hole of the grinding tool. 
   
   
       5 . The grinding-spindle assembly according to  claim 1  wherein the stator is mounted inside a shaft and is attached in a rotationally fixed manner to this shaft. 
   
   
       6 . The grinding-spindle assembly according to  claim 1  wherein the shaft holds part of the supply means for the ring motor. 
   
   
       7 . The grinding-spindle assembly according to  claim 6  wherein part of the supply means for the ring motor is at least one passage for an electrical line and/or at least one supply passage for coolant. 
   
   
       8 . The grinding-spindle assembly according to  claim 1  wherein the grinding tool is a profile-grinding tool. 
   
   
       9 . The grinding-spindle assembly according to  claim 8  wherein the grinding tool is a tool to machine gear teeth using the gear-generation or partial-gear-generation method. 
   
   
       10 . The grinding-spindle assembly according to  claim 2  wherein the at least one bearing block is guided in a linearly movable fashion on a bed along at least one guide. 
   
   
       11 . The grinding-spindle assembly according to  claim 10  wherein at least two bearing blocks are provided that are guided in movable fashion both jointly as well as relative to each other. 
   
   
       12 . The grinding-spindle assembly according to  claim 10  wherein a motor is provided as the drive for the linear motion. 
   
   
       13 . The grinding-spindle assembly according to  claim 8  wherein the bed is pivotal about an axis. 
   
   
       14 . A grinding-spindle assembly comprising:
 a pair of stationary bearing blocks spaced apart along an axis;   a shaft fixed to and extending axially between the bearing blocks;   a tubular rotor coaxially surrounding the shaft between the bearing blocks;   bearings on the shaft supporting the rotor for rotation about the axis on the shaft;   a stator on the shaft forming with the rotor a ring motor; and   a grinding tool rotationally fixed to the rotor.   
   
   
       15 . The assembly defined in  claim 14  wherein the stator is a coil on the shaft. 
   
   
       16 . The assembly defined in  claim 15  wherein the rotor is provided with at least one permanent magnet juxtaposed with the coil. 
   
   
       17 . The assembly defined in  claim 14  wherein the bearings axially flank the stator and rotor.