Vibration absorber
A vibration absorber ( 1 ) with radially acting hydraulic damping has a bearing core ( 2 ). A bearing cage ( 4 ) radially surrounding the bearing core ( 2 ) and an elastomer body ( 18 ) resiliently connects the bearing core ( 2 ) and the bearing cage ( 4 ). An outer sleeve ( 24 ) radially surrounds the elastomer body ( 18 ) for connection to an absorber mass ( 40 ). At least two working chambers ( 28 ) to be filled with a damping fluid are formed in the elastomer body ( 18 ). The working chambers ( 28 ) are connected fluidically to one another by means of a dimensionally stable fluid duct ( 26 ).
1. A vibration absorber ( 1 ) with radially acting hydraulically damping, comprising:
a bearing core ( 2 );
a bearing cage ( 4 ) radially surrounding the bearing core ( 2 );
an elastomer body ( 18 ) resiliently connecting the bearing core ( 2 ) and the bearing cage ( 4 ), at least two working chambers ( 28 ) being formed in the elastomer body and being configured to be filled with a damping fluid, the working chambers ( 28 ) being connected fluidically to one another by a dimensionally stable fluid duct ( 26 );
an outer sleeve ( 24 ) radially surrounding the elastomer body ( 18 ) for connection to an absorber mass ( 40 ); and
at least one fluid duct segment support ( 12 ) that supports the fluid duct ( 26 ), wherein
the bearing cage ( 4 ) has two diametrically arranged abutment segment supports ( 14 ), each of which supports an abutment region ( 35 ) of the elastomer body ( 18 ) towards the outer sleeve ( 24 ),
the abutment segment supports ( 14 ) are offset by approximately 90° with respect to the fluid duct segment supports ( 12 ), and
the fluid duct segment support ( 12 ) is offset radially inward relative to the abutment segment supports ( 14 ).
2. The vibration absorber ( 1 ) of claim 1 , wherein the absorber mass ( 40 ) is connected to the outer sleeve ( 24 ).
3. The vibration absorber ( 1 ) of claim 2 , wherein the absorber mass ( 40 ) has an axial mounting bore ( 42 ) that is smaller in diameter than a diameter of the bearing core ( 2 ).
4. The vibration absorber ( 1 ) of claim 2 , wherein the center of gravity (SP) of the vibration absorber ( 1 ) is arranged substantially in the geometric center of the elastomer body ( 18 ).
5. The vibration absorber ( 1 ) of claim 1 , wherein
each of the working chambers ( 28 ) has at least one radial chamber opening ( 32 ),
the two chamber openings ( 32 ) are delimited towards the outside in the radial direction by the outer sleeve ( 24 ),
the fluid duct segment support ( 12 ) is formed on the bearing cage ( 4 ), and
the fluid duct segment support ( 12 ) supports the fluid duct ( 26 ) at least in a radial direction.
6. The vibration absorber ( 1 ) of claim 1 , wherein
each of the two working chambers ( 28 ) has two radial chamber openings ( 32 ) and the vibration absorber ( 1 ) has two of the fluid ducts ( 26 ), the working chambers ( 28 ) being connected fluidically to one another by means of the two fluid ducts ( 26 ),
the bearing cage ( 4 ) has two fluid duct segment supports ( 12 ) each of which supports one of the fluid ducts ( 26 ) at least in a radial direction, and
the fluid ducts ( 26 ) are arranged diametrically.
7. The vibration absorber ( 1 ) of claim 1 , wherein the fluid duct ( 26 ) has a ratio of height to width of approximately 1:20 to approximately 1:5.
8. The vibration absorber ( 1 ) of claim 1 , wherein the fluid duct ( 26 ) extends along an angular range of approximately 20° to approximately 45°.
9. The vibration absorber ( 1 ) of claim 1 , wherein a frequency at which a strongest damping is produced by the damping fluid is over 1.5 times the natural frequency of the absorber.
10. The vibration absorber ( 1 ) of claim 1 , wherein the bearing core ( 2 ) and/or the bearing cage ( 4 ) has a stop projection ( 16 ) that delimits an amount of displacement of the bearing core ( 2 ) and the bearing cage ( 4 ) relative to one another at least in a radial direction.
11. A vibration absorber ( 1 ) with radially acting hydraulically damping, comprising:
a bearing core ( 2 );
a bearing cage ( 4 ) radially surrounding the bearing core ( 2 );
an elastomer body ( 18 ) resiliently connecting the bearing core ( 2 ) and the bearing cage ( 4 ), at least two working chambers ( 28 ) being formed in the elastomer body and being configured to be filled with a damping fluid, the working chambers ( 28 ) being connected fluidically to one another by a dimensionally stable fluid duct ( 26 );
an outer sleeve ( 24 ) radially surrounding the elastomer body ( 18 ) for connection to an absorber mass ( 40 ); and
stop projections ( 16 ) formed on both the bearing core ( 2 ) and the bearing cage ( 4 ), and
the respective stop projections ( 16 ) being offset axially with respect to one another to limit an amount of relative displacement of the bearing core ( 2 ) and the bearing cage ( 4 ) in both axial and radial directions.
12. The vibration absorber ( 1 ) of claim 11 , further comprising at least one fluid duct segment support ( 12 ) that supports the fluid duct.
13. The vibration absorber ( 1 ) of claim 12 , wherein
the bearing cage ( 4 ) has two diametrically arranged abutment segment supports ( 14 ), each of which supports an abutment region ( 35 ) of the elastomer body ( 18 ) towards the outer sleeve ( 24 ),
the abutment segment supports ( 14 ) are offset by approximately 90° with respect to the fluid duct segment supports ( 12 ), and
the fluid duct segment support ( 12 ) is offset radially inward relative to the abutment segment supports ( 14 ).