Fluid filled type vibration damping device

A fluid filled type vibration damping device comprising:

• a first mounting member and a second mounting member linked by a main rubber elastic body;
• a pressure receiving chamber whose wall is partially defined by the main rubber elastic body;
• and
• an equilibrium chamber whose wall is partially defined by a flexible film, the pressure receiving chamber and the equilibrium chamber being filled with a non-compressible fluid, and the pressure receiving chamber and the equilibrium chamber communicating with each other through an orifice passage, wherein
• a partition member that partitions the pressure receiving chamber and the equilibrium chamber is provided with a communication aperture that connects the pressure receiving chamber and the equilibrium chamber,
• an obstructing rubber elastic plate is superposed against the communication aperture from a pressure receiving chamber side so as to obstruct the communication aperture, and is arranged such that pressure of the pressure receiving chamber acts upon a first face of the obstructing rubber elastic plate while pressure of the equilibrium chamber acts on another face thereof through the communication aperture,
• a plurality of contact retaining portions that are held in contact against the partition member are arranged circumferentially on an outer peripheral edge of the obstructing rubber elastic plate,
• an elastic deformation zone is arranged circumferentially between the contact retaining portions adjacently situated on the obstructing rubber elastic plate, so as to undergo elastic deformation on a basis of pressure differential between the pressure receiving chamber and the equilibrium chamber to be spaced away from the partition member to cause the communication aperture to open up,
• a non-linearizing member is provided to endow non-linear elastic characteristics on the elastic deformation zone of the obstructing rubber elastic plate such that the elastic characteristics become more rigid in a non-linear manner in association with increase in an amount of elastic deformation of the elastic deformation zone,
• an excess pressure avoiding mechanism is provided in which the obstructing rubber elastic plate is adapted to undergo elastic deformation on the basis of pressure differential between the pressure receiving chamber and the equilibrium chamber so that the outer peripheral edge of the obstructing rubber elastic plate is separated from the partition member so as to cause the communication aperture to open up,
• an obstructed space is formed so as to extend between superposed surfaces between the partition member and the obstructing rubber elastic plate, and
• the communication aperture is connected with an outer peripheral portion of the obstructed space so that the pressure of the equilibrium chamber adapted to act on the obstructing rubber elastic plate through the communication aperture acts thereon via the obstructed space.

A fluid filled type vibration damping device comprising:

• a first mounting member and a second mounting member linked by a main rubber elastic body;
• a pressure receiving chamber whose wall is partially defined by the main rubber elastic body;
• and
• an equilibrium chamber whose wall is partially defined by a flexible film, the pressure receiving chamber and the equilibrium chamber being filled with a non-compressible fluid, and the pressure receiving chamber and the equilibrium chamber communicating with each other through an orifice passage, wherein
• a partition member that partitions the pressure receiving chamber and the equilibrium chamber is provided with a communication aperture that connects the pressure receiving chamber and the equilibrium chamber,
• an obstructing rubber elastic plate is superposed against the communication aperture from a pressure receiving chamber side so as to obstruct the communication aperture, and is arranged such that pressure of the pressure receiving chamber acts upon a first face of the obstructing rubber elastic plate while pressure of the equilibrium chamber acts on another face thereof through the communication aperture,
• a plurality of contact retaining portions that are held in contact against the partition member are arranged circumferentially on an outer peripheral edge of the obstructing rubber elastic plate,
• an elastic deformation zone is arranged circumferentially between the contact retaining portions adjacently situated on the obstructing rubber elastic plate, so as to undergo elastic deformation on a basis of pressure differential between the pressure receiving chamber and the equilibrium chamber to be spaced away from the partition member to cause the communication aperture to open up,
• a non-linearizing member is provided to endow non-linear elastic characteristics on the elastic deformation zone of the obstructing rubber elastic plate such that the elastic characteristics become more rigid in a non-linear manner in association with increase in an amount of elastic deformation of the elastic deformation zone,
• the contact retaining portions, which are held in contact against the partition member on the obstructing rubber elastic plate, include a center mounting portion located in a center section of the obstructing rubber elastic plate and a plurality of spoke-shaped retaining portions that extend radially from the center mounting portion towards an outer peripheral side,
• a zone situated circumferentially between the spoke-shaped retaining portions that are adjacently situated in a circumferential direction on the obstructing rubber elastic plate defines the elastic deformation zone adapted to undergo elastic deformation on the basis of pressure differential between the pressure receiving chamber and the equilibrium chamber such that the elastic deformation zone undergoes elastic deformation in a direction of separation from the partition member so as to cause the communication aperture to become an open state via an outer peripheral edge of the elastic deformation zone, and
• the elastic deformation zone is provided with an elastic deformation limiting member in a center section thereof that is spaced away from both the spoke-shaped retaining portions located on circumferentially opposite sides thereof and the outer peripheral edge thereof such that the elastic deformation limiting member is adapted to limit an amount of displacement of the elastic deformation zone in the direction of separation from the partition member.

A fluid filled type vibration damping device comprising:

• a first mounting member and a second mounting member linked by a main rubber elastic body;
• a pressure receiving chamber whose wall is partially defined by the main rubber elastic body;
• and
• an equilibrium chamber whose wall is partially defined by a flexible film, the pressure receiving chamber and the equilibrium chamber being filled with a non-compressible fluid, and the pressure receiving chamber and the equilibrium chamber communicating with each other through an orifice passage, wherein
• a partition member that partitions the pressure receiving chamber and the equilibrium chamber is provided with a communication aperture that connects the pressure receiving chamber and the equilibrium chamber,
• an obstructing rubber elastic plate is superposed against the communication aperture from a pressure receiving chamber side so as to obstruct the communication aperture, and is arranged such that pressure of the pressure receiving chamber acts upon a first face of the obstructing rubber elastic plate while pressure of the equilibrium chamber acts on another face thereof through the communication aperture,
• a plurality of contact retaining portions that are held in contact against the partition member are arranged circumferentially on an outer peripheral edge of the obstructing rubber elastic plate,
• an elastic deformation zone is arranged circumferentially between the contact retaining portions adjacently situated on the obstructing rubber elastic plate, so as to undergo elastic deformation on a basis of pressure differential between the pressure receiving chamber and the equilibrium chamber to be spaced away from the partition member to cause the communication aperture to open up,
• a non-linearizing member is provided to endow non-linear elastic characteristics on the elastic deformation zone of the obstructing rubber elastic plate such that the elastic characteristics become more rigid in a non-linear manner in association with increase in an amount of elastic deformation of the elastic deformation zone,
• an annular seal rib is integrally formed with an outside peripheral section of the obstructing rubber elastic plate so as to project from an opposed face thereof against the partition member and extend continuously about an entire circumference in a circumferential direction, and
• in a superposed state of the obstructing rubber elastic plate against the partition member, the seal rib is positioned in abutment with the partition member.