Bearing bush for a rotating shaft, bearing shield, electric motor and method for manufacturing a damping element
Various teachings herein may be used to make a bearing bush for a rotating shaft, wherein a wall of the bearing bush has a wall thickness which amounts to less than 10% of the diameter of the bearing bush. In the axial direction, the bearing bush is made from a plurality of layers connected with a material bond. Each layer has a layer thickness between 10 μm and 200 μm and the wall has closed cavities which are filled with a powder.
1. A bearing bush for a rotating shaft, the bearing bush comprising:
a plurality of layers stacked along a longitudinal axis of the bearing bush, wherein each layer has a thickness along the longitudinal axis between 10 μm and 200 μm;
wherein the individual layers are connected to adjacent layers with a material bond, forming a wall with a wall thickness less than 10% of a diameter of the bearing bush measured transverse to the longitudinal axis; and
the wall includes closed cavities filled with a powder.
2. The bearing bush as claimed in claim 1 , wherein the cavities have a maximum cross-section less than 5 mm 2 .
3. The bearing bush as claimed in claim 1 , wherein the cavities have a maximum cross-section less than 3 mm 2 .
4. The bearing bush as claimed in claim 1 , wherein the cavities have a powder fill level of at least 60%.
5. The bearing bush as claimed in claim 1 , wherein the cavities have a powder fill level of at least 80%.
6. The bearing bush as claimed in claim 1 , wherein the individual layers comprise a metal alloy.
7. The bearing bush as claimed in claim 1 , wherein the individual layers comprise an iron alloy.
8. The bearing bush as claimed in claim 1 , wherein the powder in the cavities comprises a first material with a higher melting temperature than a second material of the individual layers.
9. The bearing bush as claimed in claim 8 , the first material has a higher density than the second material.
10. An electric motor comprising:
a rotor;
a stator; and
a bearing shield with a bearing brush comprising:
a plurality of layers stacked along a longitudinal axis of the bearing brush, wherein each layer has a thickness along the longitudinal axis between 10 μm and 200 μm;
wherein the individual layers are connected to adjacent layers with a material bond, forming a wall with a wall thickness less than 10% of a diameter of the bearing bush measured transverse to the longitudinal axis; and
the wall includes closed cavities filled with a powder.