FLEXIBLOC (fig. 1) – FULLY BONDED
This is a bush made up of 2 concentric tubes between which of elastomer is bonded. Under the effect of external forces or torques, the relative movement of the tubes will cause an elastic deformation of the elastomer. By consulting the service conditions, a bush should be chosen which will remain within its elastic operational limits.
SILENTBLOC (fig. 2) – PRESTRESSED
This is a bush made up of 2 concentric tubes between which a ring of “adhérite®” elastomer is inserted by force. Under the effect of external forces or torques, the relative movement of the tubes will cause an elastic deformation of the elastomer. Above a certain value the adherite will slide in the tubes.
These simple bushes are considered to have lateral stops (fig. 3) when the elastomer protrudes from the external tube in the form of a support surface with various profiles.
The lateral stop only comes into operation when the bush is forced off centre by a radial load.This causes the stop to protrude, thus ensuring an “anti-noise” role at the limit of axial movement.
FLUIDBLOC
This type of bush is intended to offer minimum resistance to torsion. The elastomer is bonded to only one of the armatures, and a suitable permanent lubricant ensures the lubrication between the elastomer and the second armature ensures a very low torsional resistance.
Seal sare provided at each end to prevent the lubricant from coming out and stop impurities from getting in.
Resistance to axial force is provided by a flange in the elastomer which bears against the side of the outer sleeve, the force being transmitted by a lateral washer.
A void bush is designed to have radial stiffness which are very different at 90° to each other.
This type of bush has a thin metallic tube between the internal tube and the external tube.
The object is to have a higher stiffness radially while keeping practically the same stiffness in torsion.
In this bush, the outer sleeve and centre axis are spherical, which enables the bush to resist relatively high radial and axial loads.
