Active fluid mounting

An active fluid mounting for controlling dynamic vibration between a vibrating member and a structure, comprising:

• (a) a passive mounting having and inner member for attachment to one of said vibrating member and said structure, said inner member including a hollow therein, an outer member for attachment to another of said vibrating member and said structure, and a first flexible element for interconnecting said inner and outer members,
• (b) an active fluid element which is detachable from said passive mounting and received within said hollow, and which does not derive any volume stiffness from said first flexible element, said cartridge-like active fluid element interconnected between said inner member and said outer member of said passive mounting, said active fluid element further comprising;
• (i) a first housing for interconnection to said inner member,
• (ii) a second housing for interconnection to said outer member,
• (iii) a second flexible element for flexibly suspending said first housing relative to said second housing,
• (iv) first and second fluid chambers within said active fluid element each having a volume stiffness,
• (v) a fluid contained in said first and second fluid chambers;
• (vi) a piston interacting with said first and second fluid chambers to cause pressure variations producing active dynamic forces which act between said inner and outer members of said passive mounting, and
• (vii) means for driving said piston which include a coil and magnet assembly having a wound coil and a permanent magnet, which is capable of actively driving said piston upon applying oscillating electrical current to said wound coil.

An active fluid mounting, comprising:

• an inner member,
• an outer member,
• a flexible element flexibly intervened between said inner and outer members,
• an active fluid element directly connected between said inner and said outer members, said active fluid element further comprising:
• a first element mounted to said inner member,
• a second element mounted to said outer member,
• a first fluid chamber including a first volume stiffness,
• a second fluid chamber including a second volume stiffness,
• an intermediate fluid chamber communicating with said first and second fluid chambers by ports,
• a fluid contained in said fluid chambers,
• a moveable piston within said intermediate chamber,
• a spring flexibly suspending said moveable piston,
• a permanent magnet generating a static magnetic field,
• pole piece means directing said static magnetic field towards said movable piston, and
• a coil which when electrically energized with oscillating electrical current creates a dynamically-varying magnetic field which interacts with said static magnetic field to oscillate said moveable piston resultantly pumping said fluid through said ports and into and out of said first and second fluid chambers.

An active fluid mounting, comprising:

• an inner member including a first linkage depending therefrom in a first direction,
• an outer member including a second linkage depending therefrom in a second direction opposed to said first direction,
• a flexible element intervening between said inner and outer members,
• first and second fluid chambers associated with said active fluid mounting,
• a fluid contained within said fluid chambers,
• a motor unit received within a pocket formed in said inner member, said motor unit including;
• a moveable piston which is adapted to pump said fluid to and from said first and second fluid chambers,
• a spring flexibly suspending said moveable piston,
• a permanent magnet generating a static magnetic field,
• pole piece means for directing said static magnetic field towards said piston, and
• a coil, which when energized, causes said moveable piston to oscillate.

An active fluid mounting, comprising:

• an inner member,
• an outer member,
• a flexible element flexibly interconnecting said inner and outer members,
• an active fluid element intervening between said inner and outer members, said active fluid element including;
• a first housing member mounted to said inner member,
• a second housing member mounted to said outer member,
• a first fluid chamber having a first volume stiffness and a first pumping area,
• a second fluid chamber having a second volume stiffness and a second pumping area,
• a fluid passageway interconnecting said first and second fluid chambers,
• a fluid contained in said first and second fluid chambers and said fluid passageway,
• a moveable piston having a third pumping area moveable within said fluid passageway to pump said fluid, said third pumping area being one tenth the size of said first pumping area and said second pumping area or smaller,
• spring means attached to and flexibly suspending said moveable piston relative to said inner member,
• a permanent magnet generating a static magnetic field,
• pole piece means directing said static magnetic field towards said movable piston, and
• a coil which when electrically energized with oscillating electrical current creates a dynamically-varying magnetic field which interacts with said static magnetic field to oscillate said moveable piston resultantly pumping said fluid into and out of said first and second fluid chambers.