Elastomeric/hydraulic vibration isolator with adjustable damping

摘要

A bush type mounting device includes an outer sleeve; an intermediate sleeve, radially inward from said outer sleeve defining an annular space; an inner portion radially inward from said intermediate sleeve; a spring material bonded to an outer surface of the inner metal and to an inner surface of said intermediate sleeve diametrically located to provide said device with a main fluid chamber and at least two additional fluid chambers, each containing a fluid and said main chamber being fluidly connected to the first fluid chamber and said first chamber is fluidly connected to the second fluid chamber; an inertial damping channel molded in the annular space connecting the main and said second fluid chamber; and a coupling/decoupling means to alternately couple and at least partially decouple the vibration damping action of the fluid flow through the damping channel, where the coupling/decoupling means includes a flexible extensible elastomeric diaphragm sealingly attached to the intermediate sleeve to create an air chamber, the diaphragm being deflectable into the first fluid chamber a distance relative to the pressure differential between the fluid pressure in the main fluid chamber and the air pressure in the air chamber, one surface of the diaphragm facing the fluid chamber and the opposite surface thereof defining said air chamber, the intermediate sleeve having a port extending through the wall thereof and to permit the flow of air in and out of the air chamber, and a means to control the flow of air through the port in and out of the air chamber to effect pressure changes within the cavity and thereby change the amount of deflection of the diaphragm.