Abstract: A fluid-filled vibration damping device including: a primary liquid chamber which gives rise to pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input; an auxiliary liquid chamber which gives rise to pressure fluctuations relative to the primary liquid chamber at times of vibration input; and an orifice passage that allows flow action of a scaled fluid between the primary liquid chamber and the auxiliary liquid chamber. The sealed fluid contains at least 0.03 volume % of a dissolved gas under atmospheric pressure at room temperature. A low-adhesion energy surface with a water contact angle of at least 90 degrees is provided on an inner surface of the primary liquid chamber.

Abstract: A fluid-filled vibration damping device including an elastic buffer body supported by a partition member and arranged in a housing space such that at least one of wall inner surfaces of the housing space on sides of a pressure-receiving chamber and an equilibrium chamber is covered by the elastic buffer body. Windows are formed to penetrate the elastic buffer body at portions corresponding to communication holes formed in walls of the housing space so that the communication holes are narrowed by the windows of the elastic buffer body, and a ratio (a/l) of an opening area (a) of the windows to a penetration length (l) thereof is made smaller than a ratio (A/L) of an opening area (A) of the communication holes to a penetration length (L) thereof.

Abstract: A fluid-filled vibration damping device including: first and second mounting members elastically connected by a main rubber elastic body; a partition member supported by the second mounting member; a pressure-receiving chamber and an equilibrium chamber disposed on either side of the partition member; a housing space formed within the partition member; a plate-shaped movable member arranged in the housing space with liquid pressures of the pressure-receiving chamber and the equilibrium chamber applied to the respective faces of the movable member; and a rubber buffer arranged on wall inner surfaces of the housing space to be struck by the movable member. The movable member is grasped partially in a thickness direction between the wall inner surfaces of the housing space via the rubber buffer at surfaces facing the wall inner surfaces of the housing space.

Abstract: An excellent liquid-filled vibration damping device is provided, which is capable of effectively suppressing cavitation, which may otherwise cause abnormal noises, without impairing a vibration damping effect. The inventive liquid-filled vibration damping device includes a liquid-filled space partitioned into a primary liquid chamber and a secondary liquid chamber communicating with each other through an orifice, a molded vulcanized rubber member which defines at least a part of the liquid-filled space, and a first retention member and a second retention member retaining the molded vulcanized rubber member. Liquid (P) to be sealingly contained in the liquid-filled space comprises a polar organic solvent as a major component, and not less than 0.2 cm3 of a gas per 1 cm3 of the liquid as measured at an ordinary temperature at an atmospheric pressure is dissolved in the liquid.

Abstract: A fluid-filled vibration damping device including: a primary liquid chamber which gives rise to pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input; an auxiliary liquid chamber which gives rise to pressure fluctuations relative to the primary liquid chamber at times of vibration input; and an orifice passage that allows flow action of a scaled fluid between the primary liquid chamber and the auxiliary liquid chamber. The sealed fluid contains at least 0.03 volume % of a dissolved gas under atmospheric pressure at room temperature. A low-adhesion energy surface with a water contact angle of at least 90 degrees is provided on an inner surface of the primary liquid chamber.

Abstract: A fluid-filled vibration damping device including: first and second mounting members elastically connected by a main rubber elastic body; a partition member supported by the second mounting member; a pressure-receiving chamber and an equilibrium chamber disposed on either side of the partition member; a housing space formed within the partition member; a plate-shaped movable member arranged in the housing space with liquid pressures of the pressure-receiving chamber and the equilibrium chamber applied to the respective faces of the movable member; and a rubber buffer arranged on wall inner surfaces of the housing space to be struck by the movable member. The movable member is grasped partially in a thickness direction between the wall inner surfaces of the housing space via the rubber buffer at surfaces facing the wall inner surfaces of the housing space.

Abstract: A fluid-filled vibration damping device including: a primary fluid chamber which gives rise to internal pressure fluctuations based on deformation of a main rubber elastic body at times of vibration input; an auxiliary fluid chamber which gives rise to pressure differentials relative to the primary fluid chamber at times of vibration input; an orifice passage which permits a non-compressible sealed fluid filling the primary fluid chamber and the auxiliary fluid chamber to flow between the two fluid chambers; and an insoluble powder mixed in the sealed fluid filling the primary fluid chamber which provides a bubble nucleus and accelerates dispersed generation of bubbles when pressure within the primary fluid chamber is decreased.

Abstract: A fluid-filled vibration damping device including an elastic buffer body supported by a partition member and arranged in a housing space such that at least one of wall inner surfaces of the housing space on sides of a pressure-receiving chamber and an equilibrium chamber is covered by the elastic buffer body. Windows are formed to penetrate the elastic buffer body at portions corresponding to communication holes formed in walls of the housing space so that the communication holes are narrowed by the windows of the elastic buffer body, and a ratio (a/l) of an opening area (a) of the windows to a penetration length (l) thereof is made smaller than a ratio (A/L) of an opening area (A) of the communication holes to a penetration length (L) thereof.

Abstract: An electromagnetic actuator wherein an annular supporting member secured to a stator and an oscillator member secured to a movable member are disposed in opposition in an axis-perpendicular direction and are elastically linked by a supporting rubber elastic body disposed therebetween. One axial face of the supporting rubber elastic body is furnished with an inside peripheral recessed portion and an outside peripheral protruding portion while another axial face is furnished with an inside peripheral protruding portion and an outside peripheral recessed portion so as to establish in the supporting rubber elastic body an elastic center axis that curves along a sinuous trajectory of an interconnected peak segment and valley segment situated between opposing faces of the annular supporting member and the oscillator member in the axis-perpendicular direction.

Abstract: A fluid-filled vibration damping device including a hollow buffer body with an inner space. The hollow buffer body is housed in a housing space of a partition member to come in contact with wall inner surfaces of the housing space on sides of a pressure-receiving chamber and an equilibrium chamber, while stores a movable member in the inner space thereof. Liquid pressure of the pressure-receiving chamber is applied to a first face of the movable member by having a first window portion formed in the buffer body communicated with a first communication hole of the housing space while liquid pressure of the equilibrium chamber is applied to a second face of the movable member by having a second window portion formed in the buffer body communicated with a second communication hole of the housing space.

Abstract: A fluid-filled vibration damping device including: a partition member having first and second partition plates overlapping, and a holding area formed between overlapping surfaces of center parts of the two partition plates; and a movable membrane held and arranged in the holding area. A claw-shaped part and a perforation window are formed at respective corresponding positions of outer circumference parts of the two partition plates, and a fixing mechanism is constituted with the claw-shaped part latched in a circumference edge part of the perforation window. A widening area is provided between an outer circumference surface of the movable membrane and an inner circumference surface of the holding area by partially making a large distance therebetween. At least one of the two partition plates has a first air vent hole piercing a part constituting a wall part of the widening area.

Abstract: An excellent liquid-filled vibration damping device is provided, which is capable of effectively suppressing cavitation, which may otherwise cause abnormal noises, without impairing a vibration damping effect. The inventive liquid-filled vibration damping device includes a liquid-filled space partitioned into a primary liquid chamber and a secondary liquid chamber communicating with each other through an orifice, a molded vulcanized rubber member which defines at least a part of the liquid-filled space, and a first retention member and a second retention member retaining the molded vulcanized rubber member. Liquid (P) to be sealingly contained in the liquid-filled space comprises a polar organic solvent as a major component, and not less than 0.2 cm3 of a gas per 1 cm3 of the liquid as measured at an ordinary temperature at an atmospheric pressure is dissolved in the liquid.

Abstract: A fluid-filled vibration damping device including: a partition member having first and second partition plates overlapping, and a holding area formed between overlapping surfaces of center parts of the two partition plates; and a movable membrane held and arranged in the holding area. A claw-shaped part and a perforation window are formed at respective corresponding positions of outer circumference parts of the two partition plates, and a fixing mechanism is constituted with the claw-shaped part latched in a circumference edge part of the perforation window. A widening area is provided between an outer circumference surface of the movable membrane and an inner circumference surface of the holding area by partially making a large distance therebetween. At least one of the two partition plates has a first air vent hole piercing a part constituting a wall part of the widening area.

Abstract: A fluid-filled active vibration damping device including a partition member having a holding space formed therein and a movable membrane installed in the holding space. A filter orifice tuned to a higher frequency than an orifice passage is formed at one wall part of the holding space facing to one surface of the movable membrane, and the holding space is in communication with one of a pressure receiving fluid chamber and an excitation fluid chamber through the filter orifice. An open hole is formed on the other wall part of the holding space facing to the other surface of the movable membrane opposite to the one surface in the thickness direction, and the holding space is in communication with the other of the two fluid chambers through the open hole. A through hole pierces the movable membrane in the thickness direction.

Abstract: An electromagnetic actuator wherein an annular supporting member secured to a stator and an oscillator member secured to a movable member are disposed in opposition in an axis-perpendicular direction and are elastically linked by a supporting rubber elastic body disposed therebetween. One axial face of the supporting rubber elastic body is furnished with an inside peripheral recessed portion and an outside peripheral protruding portion while another axial face is furnished with an inside peripheral protruding portion and an outside peripheral recessed portion so as to establish in the supporting rubber elastic body an elastic center axis: l that curves along a sinuous trajectory of an interconnected peak segment and valley segment situated between opposing faces of the annular supporting member and the oscillator member in the axis-perpendicular direction.

Abstract: A fluid-filled type vibration damping device wherein a second mounting member is secured to a vehicle body; an opening of the second mounting member is closed off to define a pressure-receiving chamber a flexible film is arranged covering an outside of a main rubber elastic body to define an equilibrium chamber; a low-frequency orifice passage and a high-frequency orifice passage connect the pressure-receiving chamber and the equilibrium chamber a first moveable member is disposed on a fluid channel through the high-frequency orifice passage; the first moveable member being supported by a first support member that is linked to the second mounting member via the main rubber elastic body; and a fluid channel through the low-frequency orifice passage is situated away from the placement location of the first moveable member.

Abstract: A vibration damping device having a rubber heat-insulating cover wherein the rubber heat-insulating cover is formed as a separate component from a stopper member and is disposed between the stopper member and a main rubber elastic body connecting a first and second mounting member. The rubber heat-insulating cover is fixed to the stopper member with a center section of the rubber heat-insulating cover juxtaposed from an inner face side against a strike plate portion of the stopper member to be supported by the strike plate portion. With a peripheral wall section of the rubber heat-insulating cover juxtaposed from the inner face side against leg portions of the stopper member to be supported by the leg portions. A cushioning rubber is integrally formed with the center section of the rubber heat-insulating cover supported on the strike plate portion, and projects towards the first mounting member.

Abstract: A vibration damping device having a rubber heat-insulating cover wherein a strike plate portion and a pair of leg portions of a stopper member have detaining slots opening towards an outside, and two side walls of the detaining slot of the strike plate portion has stepped portions of notched shape disposed in its heightwise distal edge section. Center hook portions are formed on an outside face of a center section of the rubber heat-insulating cover, while outside hook portions are formed on an outside face of a peripheral wall portion of the rubber heat-insulating cover. The center hook portions are engaged with the two side walls of the detaining slot, and the outside hook portions are engaged with the two side walls of the detaining slots in the leg portions. Two end faces of the center hook portions are held in abutment against stepped faces at either end of the stepped portions in both side walls of the detaining slot.

Abstract: In an active fluid-filled engine mount, a oscillation member is excited and displaced by an electromagnetic actuator, and thereby pressure in a pressure receiving chamber is actively controlled. A short circuit passage is provided connecting the pressure receiving chamber and an equilibrium chamber. A ratio of a passage cross-sectional area and a passage length of the short circuit passage (a/l) is provided greater than a ratio of a passage cross-sectional area and a passage length of the first orifice passage (A/L) (A/L<a/l). The passage cross-sectional area of the short circuit passage (a) is provided smaller than the passage cross-sectional area of the first orifice passage (A) (a<A).

Abstract: A fluid-filled type vibration damping device wherein a second mounting member is secured to a vehicle body; an opening of the second mounting member is closed off to define a pressure-receiving chamber a flexible film is arranged covering an outside of a main rubber elastic body to define an equilibrium chamber; a low-frequency orifice passage and a high-frequency orifice passage connect the pressure-receiving chamber and the equilibrium chamber a first moveable member is disposed on a fluid channel through the high-frequency orifice passage; the first moveable member being supported by a first support member that is linked to the second mounting member via the main rubber elastic body; and a fluid channel through the low-frequency orifice passage is situated away from the placement location of the first moveable member.