Rubber bearing
The rubber bearing or the silent bushing is the combination of the metallic bushing of a pivot bearing with a rubber element that encompasses the bearing bushing . The rubber is in turn surrounded by a metallic sleeve with which the bearing z. B. is attached to a machine frame. The rubber sleeve is vulcanized onto the inner and outer metal sleeves .
In addition to damping the transmission of sound and vibrations , this joint (theoretical degree of freedom f = 1) is used in particular in automotive engineering , e.g. B. in wheel suspensions , used as an inexpensive replacement for ball joints (f = 3). The elastically possible tilting of the bearing bush by a small " cardanic angle " is sufficient there for the two additional degrees of freedom required. The cardanic angles reach values of up to ± 5 °, the axial elastic mobility , which is also used, is up to ± 3 mm.
In the automotive industry was for the storage of dead beam axles the design of the track corrective rubber bearing developed. Here the bearing bushing and rubber sleeve are conical over part of the circumference , which means that the wheel on the outside of the curve is "moved into toe- in" (twist beam axle rotated around the vertical axis when cornering ).
A silent block is also a connecting element with a cushioning intermediate layer made of rubber, but which does not contain a pivot bearing.
Individual evidence
- ↑ Definition of the terms "cardanic deformation", "cardanic angle" in automobile construction: cf. Wolfgang Matschinsky: Wheel guides for road vehicles , 2007, p. 118
- ↑ Bernd Heißing Metin Ersoy, Stefan Gies: Chassis Handbook , 2013, p 356, (sections "rubber bearing" p 356-361 and "sleeve bearing" pp 489-491).
- ↑ Bernd Heißing Metin Ersoy, Stefan Gies: Chassis Handbook , pages 359, 360 u. 435.