Abstract: [Problem to be Solved] To provide an antivibration device that can realize low dynamic spring characteristics in a high vibration region while securing a damping force in a low vibration region. [Solution] In the case where a load input in the axial direction of a coupling member is a predetermined value or smaller, the dynamic spring constant of a first bush 10 is set larger than that of a second bush 20, and the loss factor of the second bush 20 is set larger than that of the first bush 10. On the other hand, in the case where the load input in the axial direction of the coupling member 30 exceeds the predetermined value, the dynamic spring constant of the first bush 10 is set smaller than that of the second bush 20.

Abstract: To provide a vibration isolation unit capable of reducing the number of parts, man-hour and material cost, and suppressing the product cost. One side of a stopper rubber member continues to the outer edge of a diaphragm. Accordingly, because they can be vulcanizingly molded simultaneously, the number of parts can be reduced. Also, because the diaphragm is attached to an outer tube member, the stopper rubber member also can be fixed simultaneously, and therefore the man-hour can be reduced. Further, because one side of the stopper rubber member continues to the outer edge of the diaphragm, overlapping of them in an axial view can be avoided, and a rubber material can be used efficiently. Thus, the number of parts, man-hour and material cost can be reduced and the product cost of the overall vibration isolation unit can be suppressed.

Abstract: Provided is a vibration isolation device such that weight reduction can be achieved and it is possible to simplify the structure of a resin molding die for molding the bracket member. Engagement in a direction where the external member (60) slips out of the bracket member (30) occurs in a structure achieved in such a way that a pair of first wall section parts (62) of the external member (60) are installed inside the bracket member (30). As a result, it is possible to curb a situation where, as in the case of conventional vibration damping devices, undercut shapes are formed. Consequently, it is possible to simplify the structure of the resin molding die for molding the bracket member (30). Furthermore, as regards the external member (60), a portion between the leg sections (50), which form a pair, is omitted, and therefore, weight can be reduced correspondingly.

Abstract: [Problem to be Solved] To provide an antivibration device that can realize low dynamic spring characteristics in a high vibration region while securing a damping force in a low vibration region. [Solution] In the case where a load input in the axial direction of a coupling member is a predetermined value or smaller, the dynamic spring constant of a first bush 10 is set larger than that of a second bush 20, and the loss factor of the second bush 20 is set larger than that of the first bush 10. On the other hand, in the case where the load input in the axial direction of the coupling member 30 exceeds the predetermined value, the dynamic spring constant of the first bush 10 is set smaller than that of the second bush 20.

Abstract: Provided is a vibration isolation device such that weight reduction can be achieved and it is possible to simplify the structure of a resin molding die for molding the bracket member. Engagement in a direction where the external member (60) slips out of the bracket member (30) occurs in a structure achieved in such a way that a pair of first wall section parts (62) of the external member (60) are installed inside the bracket member (30). As a result, it is possible to curb a situation where, as in the case of conventional vibration damping devices, undercut shapes are formed. Consequently, it is possible to simplify the structure of the resin molding die for molding the bracket member (30). Furthermore, as regards the external member (60), a portion between the leg sections (50), which form a pair, is omitted, and therefore, weight can be reduced correspondingly.

Abstract: A vibration-proof apparatus which enables the structure of a resin die to be simplified. A vibration-proof apparatus comprising: a coupling member (10) consisting of a resin material and provided with leg part (13) in which thin and thick elastic members (45, 46), which are vulcanized and bonded to short-axis and long-axis attachment bracket members (50, 51), are press-fitted, and also with a main body part (11) which is formed so as to be continuous with the leg parts; a vibration-proof base (40) for connecting an inner cylinder (30) to the main body part (11) of the coupling member (10) and consisting of a rubber-like elastic body.

Abstract: There is provided a hydraulic antivibration device and an assembly capable of obtaining a low dynamic spring characteristic upon input of relatively small amplitude vibrations and reducing sufficiently strange sounds. The low dynamic spring characteristic is obtainable by absorption of hydraulic pressure fluctuations between both liquid chambers due to reciprocating displacement of an elastic partition membrane. First and a second attachment fittings are constituted respectively as body frame side coupling means and as vibration generator or engine side coupling means, whereby part of a vibration transmitting path from partitioning means to the body frame can be formed by a vibration-isolating base.

Abstract: There are provided a hydraulic antivibration device and an assembly incorporated thereby capable of obtaining a low dynamic spring characteristic upon input of relatively small amplitude vibrations and reducing sufficiently strange sounds. The low dynamic spring characteristic is obtainable by absorption of hydraulic pressure fluctuations between both liquid chambers 6A, 6B due to reciprocating displacement of an elastic partition membrane 10. A first and a second attachment fittings 1, 2 are constituted respectively as body frame side coupling means and as vibration generator or engine side coupling means, whereby part of a vibration transmitting path from partitioning means 7 to the body frame BF can be formed by a vibration-isolating base 3.

Abstract: An anti-vibration device is provided, with which it is possible to fix securely a stirring plate and the like member to a mounting end piece of a first fitting even though made of a brittle metal, e.g. aluminum diecast and to enhance the durability of the fixing structure of the stirring plate and the like member to the first fitting. It comprises the first fitting, a second fitting, a vibration isolating base, a diaphragm, a partition body, an orifice, and a stirring plate, wherein the mounting end piece is inserted in a mounting hole of the stirring plate, thereby to receive one plate member of the stirring plate on a receiving surface portion of the mounting end piece, and a projecting portion of the mounding end piece is upset so that a peripheral wall thereof in longitudinal cross-section may be an arc profile and a marginal area of a projecting end surface on the peripheral wall side thereof may be spherical.

Abstract: An anti-vibration device is provided, with which it is possible to fix securely a stirring plate and the like member to a mounting end piece of a first fitting even though made of a brittle metal, e.g. aluminum diecast and to enhance the durability of the fixing structure of the stirring plate and the like member to the first fitting. It comprises the first fitting, a second fitting, a vibration isolating base, a diaphragm, a partition body, an orifice, and a stirring plate, wherein the mounting end piece is inserted in a mounting hole of the stirring plate, thereby to receive one plate member of the stirring plate on a receiving surface portion of the mounting end piece, and a projecting portion of the mounding end piece is upset so that a peripheral wall thereof in longitudinal cross-section may be an arc profile and a marginal area of a projecting end surface on the peripheral wall side thereof may be spherical.

Abstract: To be able to exhibit precise and sufficient vibration damping performance with regard to vibration not only in the low frequency region but also a wide range of high frequencies with less power consumption, an MR fluid pathway 9 for hermetically sealing and holding the MR fluid 8 is formed to be of crankshaft shape in cross section with vertical pathway portions 9A, 9B and horizontal pathway portions 9C, the pathway being between a piston-shaped member 6 and a cylindrical member 7 capable of displacing relative to each other in the direction of elastic deformation of the elastomer 5 due to applied vibration, an electromagnet 10 capable of forming a magnetic field across the horizontal pathway portions 9C of the pathway 9, controlling the amplitude of the magnetic field to thereby change the viscosity of the MR fluid 8, fixed and supported on the piston-shaped member 6.

Abstract: The active vibration-isolating device of the invention is used for preventing vibrations due to ground motions or running of an automobile from being propagated to a platform which is disposed in, for example, a semiconductor device factory or a laser device factory, and on which various kinds of equipment are to be mounted, and also from causing the platform to vibrate. The device has: an air spring which elastically supports a platform; a piston-like member which abuts against and supports the platform; plural piezoelectric actuators which can be externally controlled; a working fluid such as an aqueous solution of ethylene glycol which transmits driving displacements of the piezoelectric actuators to the piston-like member via piston members which are respectively fixed to ends of the piezoelectric actuators in a driving direction x; and a fluid path in which the working fluid is hermetically filled.