Motor spindle

A motor spindle for driving a machining tool, comprising a sleeve-shaped stator extending along a stator axis, which stator has a first magnet system, a first coupling receptacle and a second coupling receptacle, and further comprising a rotor, which has a rotor shaft extending along a rotor axis, a second magnet system, a first coupling part and a second coupling part, wherein the first coupling part is mounted to the first coupling receptacle and is connected with the rotor shaft so as to be rotatable about the rotor axis by means of a first rolling bearing serving as an axial fixed bearing, and wherein the second coupling part is mounted to the second coupling receptacle and is connected with the rotor shaft so as to be rotatable about the rotor axis by means of a second rolling bearing serving as an axial loose bearing, wherein the second rolling bearing comprises an inner ring mounted on the rotor shaft and an outer ring arranged coaxially to the inner ring and mounted on the second coupling part, which outer ring defines with the inner ring an annular bearing gap in which a plurality of rolling elements are accommodated, the second coupling part being accommodated on the rotor shaft so as to be axially movable parallel to the rotor axis between a locked position and a release position along a movement path, wherein a minimum distance between a first axial surface of the inner ring and the second coupling part and a minimum distance between a second axial surface of the inner ring, which faces away from the first axial surface, and the second coupling part are always greater than zero for the entire movement path, and

• wherein at least one latch recess is formed on an outer surface of the second coupling part, and wherein the second coupling receptacle is provided on an inner circumferential surface with a plurality of latches, the latches being adjustable between a release position and a locking position and wherein the latches are in positive engagement with the at least one latch recess in the locking position.

A motor spindle for driving a machining tool, comprising a sleeve-shaped stator extending along a stator axis, which stator has a first magnet system, a first coupling receptacle and a second coupling receptacle, and further comprising a rotor, which has a rotor shaft extending along a rotor axis, a second magnet system, a first coupling part and a second coupling part, wherein the first coupling part is mounted to the first coupling receptacle and is connected with the rotor shaft so as to be rotatable about the rotor axis by means of a first rolling bearing serving as an axial fixed bearing, and wherein the second coupling part is mounted to the second coupling receptacle and is connected with the rotor shaft so as to be rotatable about the rotor axis by means of a second rolling bearing serving as an axial loose bearing, wherein the second rolling bearing comprises an inner ring mounted on the rotor shaft and an outer ring arranged coaxially to the inner ring and mounted on the second coupling part, which outer ring defines with the inner ring an annular bearing gap in which a plurality of rolling elements are accommodated, the second coupling part being accommodated on the rotor shaft so as to be axially movable parallel to the rotor axis between a locked position and a release position along a movement path, wherein a minimum distance between a first axial surface of the inner ring and the second coupling part and a minimum distance between a second axial surface of the inner ring, which faces away from the first axial surface, and the second coupling part are always greater than zero for the entire movement path, and

• wherein the second coupling receptacle has a latch guide which is displaceable in a relatively movable manner along the stator axis and is provided with guide recesses in which a plurality of latches are received in a movable manner transversely with respect to the stator axis, wherein the latch guide is movably mounted on a guide sleeve which is provided with a control surface which serves for a movement control of the latches in such a way that a relative movement of the latch guide relative to the guide sleeve causes a displacement of the latches in the radial direction.