Abstract: An antivibration device capable of attaining damping performance in a comparatively broad frequency band range is provided. In the antivibration device, between an inner cylinder and an outer cylinder, formed are a first liquid chamber, a second liquid chamber, and a third liquid chamber. There are provided a first orifice passage that makes the first liquid chamber and the second liquid chamber communicate with each other, and a second orifice passage that makes one of the first liquid chamber and the second liquid chamber and the third liquid chamber communicate with each other.

Abstract: A liquid-sealed vibration prevention device is provided with a main rubber-elastic body for elastically connecting an inner cylinder with an intermediate sleeve, an outer cylinder for sheathing the intermediate sleeve, and a seal rubber layer positioned on the inner-circumferential surface of the outer cylinder. The intermediate sleeve has an upper ring part, and the upper end face of the upper ring part is provided with an inclined projection part which extends diagonally upward toward the inner cylinder. Moreover, a pair of rotation-stop rubbers that holds the inclined projection part in the circumferential direction of the intermediate sleeve is provided on the inner side of an annular recess of the outer cylinder and on the upper part side of the seal rubber layer.

Abstract: Provided is an anti-vibration device which is provided between a vibration-side bracket attached to a vibration member and a non-vibration-side bracket attached to a non-vibration member, the anti-vibration device including: a first attachment member attached to the vibration-side bracket; a second attachment member attached to the non-vibration-side bracket; and an insulator provided between the first attachment member and the second attachment member, wherein the first attachment member includes a stopper portion which faces an engagement portion formed on the non-vibration-side bracket, and the insulator includes a cover portion which covers at least a surface of the stopper portion facing the engagement portion.

Abstract: A mount apparatus that achieves both space saving and weight saving and is excellent in fatigue strength, is provided. The mount apparatus comprises a pair of attachment parts to be attached to a car body, a vibration receiving part, fixed to the attachment parts, for receiving input vibrations from a vibration source through an elastic material, and a dropout prevention plate supporting the vibration receiving part, the attachment parts and the vibration receiving part being made of resin, wherein the dropout prevention plate is arranged so as to cover an outer surface of the vibration receiving part at a predetermined interval from the outer surface of the vibration receiving part, wherein both ends of the dropout prevention plate is fixed through the pair of attachment parts to the car body.

Abstract: The present invention provides a vibration-damping device having an inner cylinder, an outer cylinder arranged at a distance on an outer diameter side of the inner cylinder, a rubber elastic body interposed between the inner cylinder and the outer cylinder for elastically coupling the inner cylinder and the outer cylinder, and an intermediate plate embedded in the rubber elastic body. A plurality of cutout parts positioned on both end sides in the axial direction of the outer cylinder for joining an inner side rubber elastic body and an outer side rubber elastic body are formed in the intermediate plate. At least one of the cutout parts is arranged to overlap on an area that is sandwiched between two parallel imaginary planes that are adjacent to the outer peripheral surface of the inner cylinder.

Abstract: A bush (20) includes a base material (45) that is disposed at a vehicle body (12), an inter ring (48) that is integrally disposed at the base material (45), and a surface layer (51) that is disposed inside the inter ring (48). The inter ring (48) is arranged along an opening (47) in such a manner as to surround the opening (47). The surface layer (51) includes an insertion hole (52) and is integrally formed from a self-adhesive elastic material into a thin wall shape. A stabilized rod (14) is inserted into the insertion hole (52).

Abstract: A pair of fluid chambers in which incompressible fluid is sealed and a pair of orifice-forming members that allows one fluid chamber to communicate with the other fluid chamber are arranged between an inner cylinder and an outer cylinder. The orifice-forming member has a longitudinal groove that communicates with respective fluid chambers, an orifice channel, and a liquid storage section that allows the longitudinal groove to communicate with the orifice channel. The liquid storage section is formed wider and deeper than the orifice channel.

Abstract: The present invention provides a vibration-damping device having an inner cylinder, an outer cylinder arranged at a distance on an outer diameter side of the inner cylinder, a rubber elastic body interposed between the inner cylinder and the outer cylinder for elastically coupling the inner cylinder and the outer cylinder, and an intermediate plate embedded in the rubber elastic body. A plurality of cutout parts positioned on both end sides in the axial direction of the outer cylinder for joining an inner side rubber elastic body and an outer side rubber elastic body are formed in the intermediate plate. At least one of the cutout parts is arranged to overlap on an area that is sandwiched between two parallel imaginary planes that are adjacent to the outer peripheral surface of the inner cylinder.

Abstract: Antivibration rubber device provided between a vibration source and a vehicle body is provided with: a first mounting member (11) which is mounted to the vibration source side; an elastic member (13) which is in close contact with a surface of the first mounting member (11) and has a step formed at the end part on the vibration source side; and a second mounting member (12) which is integrally connected to the vehicle body side, thereby suppressing occurrence of a crack in the elastic member of the antivibration rubber device and improving durability enabling long-term use.

Abstract: A vibration-insulating rubber composition includes: a rubber component (A) that is composed of an isoprene-based rubber; a rubber component (B) that is composed of a butadiene-based rubber; carbon black that is present mainly in the rubber component (B); and silica that is present mainly in the rubber component (A). The rubber composition exhibits improved durability without suffering from deterioration of vibration-insulation characteristics.

Abstract: A liquid-filled engine mount is disclosed which includes a rubbery elastic member interposed between an engine and a vehicle body, a diaphragm positioned in opposed relation to the rubbery elastic member. The engine mount defines a liquid chamber therein. The liquid chamber holds an actuating liquid therein. The liquid chamber has a partition wall disposed therein. The partition wall separates the liquid chamber into primary and secondary chambers. The primary chamber is provided on a side of the elastic member while the secondary chamber is provided on a side of the diaphragm. The partition wall has first and second orifices extending therethrough. The first orifice communicates with both the primary chamber and the secondary chamber. The second orifice communicates with the primary chamber. The first and second orifices provide different resistances to the liquid flowing therethrough.

Abstract: A rubber composition comprising 100 parts by weight of an ethylenically unsaturated nitrile-conjugated diene high-saturation copolymer rubber containing 20 weight % or less of conjugated diene units, and 1-100 parts by weight of an unsaturated carboxylic acid metal salt having the general formula: ##STR1## wherein R and R' represent aliphatic or aromatic hydrocarbon groups or a hydrogen atom, which may be the same or different from each other, Me represents a metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ti, Cr, Mo, Mn, Fe, Co, Ni, Cu, Ag, Zn, Cd, Hg, Al, Sn, Pb and Sb, and n is an integer of 2-4.