Electric-motor arrangement for a dental handpiece
View Patent ↗An electric-motor arrangement for a medical, in particular dental, handpiece that has a motor housing and a rotor which is arranged in the motor housing so that it can be rotated about an axis via a first bearing and a second bearing. A stator is arranged around the rotor in relation to the axis. The first bearing is received in a first bearing flange, and the second bearing is received in a second bearing flange. Both bearing flanges are composed of metal and adjoin the motor housing directly by way of their circumferential faces. As a result, running noise and vibrations can be reduced. Moreover, premature wear and/or failure can be prevented.
1. Electric-motor arrangement for a medical handpiece, comprising:
a motor housing,
a rotor arranged in the motor housing so that it can be rotated about an axis via a bearing, the bearing being gripped in a bearing flange,
a stator arranged around the rotor in relation to the axis,
a coupling pin arranged around the axis,
a first medium-line section for guiding a medium, the first medium-line section extending radially outside the rotor in relation to the axis,
a second medium-line section for further guiding the medium, the second medium-line section extending in the coupling pin and being arranged radially closer to the axis than the first medium-line section, and
a medium-diverter for a connection that guides medium between the first medium-line section and the second medium-line section, wherein the medium-diverter is formed in the bearing flange.
2. Electric-motor arrangement of claim 1 , further comprising a sealing seat for sealing between the first medium-line section and the medium-diverter or between the medium-diverter and the second medium-line section, the sealing seat being formed in at least one of the bearing flange, the stator, or the coupling pin.
3. Electric-motor arrangement of claim 2 , wherein an O-ring is arranged in the sealing seat.
4. Electric-motor arrangement of claim 1 , wherein the first medium-line section is integrated into the stator.
5. Electric-motor arrangement of claim 1 , comprising a flat seal that bears against the bearing flange for sealing between the first medium-line section and the medium-diverter or between the medium-diverter and the second medium-line section.
6. Electric-motor arrangement of claim 1 , wherein the bearing flange has a radial hole that defines a part of the medium-diverter.
7. Electric-motor arrangement of claim 6 , wherein a hose element made from elastic material is arranged in the radial hole.
8. Electric-motor arrangement of claim 7 , further comprising a pin element protruding into the hose element and sealing the hose element radially to outside with respect to the medium.
9. Electric-motor arrangement of claim 1 , comprising a lip valve arranged in the medium-diverter.
10. Electric-motor arrangement of claim 1 , wherein the bearing flange is an integral constituent part of the motor housing.
11. Electric-motor arrangement of claim 1 , wherein the medical handpiece is a dental handpiece.