Vibration isolator with two pairs of fluid chambers with diagonal fluid communication

An elasto-hydraulic vibration isolator comprising:

• a frame;
• a core movable in an axial direction relative to the frame;
• means defining at least two sets of variable volume fluid-filled chambers between said core and said frame, at least two of said chambers being on a first side of said core and at least two of said chambers being on a second side of said core, said second side being opposite of said first side in said axial direction, and each said set including at least one chamber on each of said first and second sides;
• fluid track means directly communicating chambers on the first side with chambers on the second side to place the chambers of each set in direct communication with one another and to isolate the sets from direct communication with one another;
• an expansion chamber;
• and
• a flow restrictor made of a porous material having multiple openings so as to be permeable to a fluid contained within said two sets of variable volume fluid-filled chambers, said flow restrictor selectively providing communication between at least one of said variable volume fluid-filled chambers and said expansion chamber.

An elasto-hydraulic vibration isolator, comprising:

• a core;
• a frame;
• means defining a first fluid-filled variable volume chamber between said core and said frame, said chamber bearing loads exerted between said core and said frame;
• means defining a second fluid-filled variable volume chamber;
• fluid track means connecting said first and second chambers;
• means defining an expansion chamber, said means including a flexible diaphragm dividing said expansion chamber into a gas filled subchamber and a fluid filled subchamber;
• and
• a flow restrictor made of a porous material having multiple openings so as to be permeable to a fluid contained within said variable volume chambers, said flow restrictor providing communication between at least one of said variable volume fluid filled chambers and said fluid filled subchamber for a relatively slower rate of pressure change and snubbing said communication for a relatively higher rate of pressure change.

An elasto-hydraulic vibration isolator, comprising:

• a core;
• a frame;
• first and second sets of chambers, said sets not being in direct communication with one another and each said set including at least one fluid-filled variable volume chamber between said core and said frame on a first side of said core and at least one other fluid-filled chamber between said core and said frame on a second side of said core, said second side being opposite from said first side, and both said chambers of each said set bearing load exerted between said core and said frame;
• and
• fluid track means connecting the chambers of each set.

An elasto-hydraulic vibration isolator, comprising:

• a core;
• a frame;
• an elastomeric body defining a fluid-filled variable volume chamber between said core and said frame, said chamber bearing loads exerted between said core and said frame;
• and
• a tubular ring shaped member reinforcing said body and positioned coaxially with said chamber so as to increase the hoop strength of said body, said member having an axial dimension and a radial dimension, said axial dimension being greater than said radial dimension.