Vibroisolating device with a nonlinear force vs. displacement characteristic and a motor vehicle suspension system comprising such vibroisolating device

A motor vehicle suspension system comprising:

• a housing provided with means for connection with a first displaceable object;
• a vibroisolating device disposed with said housing and including a substantially elastomeric core provided with an opening for connection with a second displaceable object;
• said vibroisolating device including at least one Belleville spring at least partially embedded in a volume of said substantially elastomeric core and disposed in surrounding relationship with said opening;
• and
• wherein said at least one Belleville spring is configured to be preloaded while said vibroisolating device is in a vibration equilibrium position so that the stiffness characteristic of the vibroisolating device is symmetrical around the vibration equilibrium position;
• wherein said opening is defined along an axis;
• said elastomeric core presents an outer surface;
• and said outer surface defines at least one cavity axially aligned with said at least one Belleville spring and radially inward of said housing;
• and
• wherein said at least one Belleville spring extends into said at least one cavity.