The bushing includes an outer cylinder, an inner cylinder, and an elastic body therebetween. The outer cylinder has a central recess portion formed in a curved shape. The inner cylinder has a central convex portion being formed in a curved shape. A distance between a vertex of the central recess portion and the vertex of the central convex portion is smaller than a distance between a point other than the vertex of the central recess portion and a point at which a straight line extending from the point other than the vertex of the central recess portion to an intersection point of the perpendicular line and the axis of the inner cylinder intersects the central convex portion.

A bogie for a railway vehicle 1 includes an elastic element 20 that is arranged between a vehicle body 7 and a bogie frame 3 of a railway vehicle and elastically supports both, and the elastic element 20 is configured in such a manner that a spring constant for displacement in the longitudinal direction in the traveling direction of the vehicle body 7 is smaller than that for displacement in the vertical direction or the left-and-right direction in the traveling direction.

A variable stiffness bushing includes: inner and outer tubular members; an elastic member connecting these tubular members. At least one pair of circumferentially separated liquid chambers is defined in the elastic member such that first axial ends and second axial ends of the liquid chambers are defined by first and second end walls of the elastic member, respectively. The liquid chambers of each pair communicate with each other by a corresponding communication passage including a circumferential passage provided in one of the tubular members, which includes a coil wound coaxially therewith and a yoke provided with at least one gap constituting the circumferential passage. A magnetic fluid fills the liquid chambers and the communication passage(s). The first and second end walls are configured such that when the tubular members are axially displaced relative to each other, a difference is created between volumes of the liquid chambers of each pair.

The bushing includes an outer cylinder, an inner cylinder, and an elastic body therebetween. The outer cylinder has a central recess portion recessed from the inner peripheral surface in the radial direction at the central portion in the axial direction, and the thickness of both end portions is thicker than the thickness of the central portion. The central recess portion is formed in a curved shape or having a curved and a straight shape. The inner cylinder has a central convex portion swelling from the outer peripheral surface in the radial direction at a position corresponding to the central recess portion. The maximum outer diameter of the central convex portion is larger than the minimum inner diameter of the inner peripheral surface of the outer cylinder.

An elastic mount for absorbing static and dynamic loads includes an inner part, an outer part, and at least one elastomer mount that elastically connects the parts. The elastomer mount transfers from a first position to a second position when absorbing a static load acting in the direction of a longitudinal axis of the mount, and may have a first elastomer body, second elastomer body, and an intermediate element arranged between the two elastomer bodies. The intermediate element may have a first connection surface aligned with the longitudinal axis such that in the second position the first elastomer body is soft in shear in the Z-direction, and rigid in the X-direction and/or the Y-direction; and a second connection surface aligned with the longitudinal axis such that in the second position the second elastomer body is soft in shear in the X-direction and/or in the Y-direction and rigid in the Z-direction.

An object of the present invention is to provide a vibration-damping device which enhances the durability of a rubber elastic body; and inhibits the occurrence of voids in an outer cylinder. The vibration-damping device includes: an inner cylinder; a resin-made outer cylinder arranged outside the inner cylinder in a radial direction of the outer cylinder; and a rubber elastic body connecting the inner cylinder and the outer cylinder.

A shaft bearing for supporting a shaft of a motor vehicle includes an inner sleeve, an outer body surrounding the inner sleeve while forming a gap, and an elastomer body elastically connecting the inner sleeve and the outer body. The inner sleeve may have a first rolling surface facing towards the elastomer body and against which a first rolling section of the elastomer body abuts. The outer body may have a second rolling surface facing towards the elastomer body and against which a second rolling section of the elastomer body abuts. The two rolling sections may be connected to each other via a fold having a free length. During movement of the inner sleeve relative to the elastomer body and/or the outer body relative to the inner sleeve, the rolling sections may roll the same distance on the rolling surfaces, so that the free length of the fold remains unchanged.

The present invention is a vibration damping device (1, 2) that includes an external member (11, 21) attached to one of a vibration-generating portion and a vibration-receiving portion; a tubular member (40) attached to the other of the vibration-generating portion and the vibration-receiving portion; and an elastic body (30) which connects the external member (11, 21) and the tubular member (40). The external member (11, 21) includes a frame-like member (11, 21) having a rectangular shape when viewed from the top. In the elastic body (30), a long-side portion (32a) forming a long side of a rectangular shape when viewed from the top adheres to an inner circumferential surface of the long-side portion (12a, 12b) of the frame-like member (11, 21), and a short-side portion (32b) forming a short side of the rectangular shape when viewed from the top comes into contact with the external member (11, 21) in a long-side direction (X) in which the long-side portion (12a, 12b) extends when viewed from the top, in a non-adhering state.

An elastic mount for absorbing static and dynamic loads includes an inner part, an outer part, and at least one elastomer mount that elastically connects the parts. The elastomer mount transfers from a first position to a second position when absorbing a static load acting in the direction of a longitudinal axis of the mount, and may have a first elastomer body, second elastomer body, and an intermediate element arranged between the two elastomer bodies. The intermediate element may have a first connection surface aligned with the longitudinal axis such that in the second position the first elastomer body is soft in shear in the Z-direction, and rigid in the X-direction and/or the Y-direction; and a second connection surface aligned with the longitudinal axis such that in the second position the second elastomer body is soft in shear in the X-direction and/or in the Y-direction and rigid in the Z-direction.

A variable stiffness bushing includes: inner and outer tubular members; an elastic member connecting these tubular members. At least one pair of circumferentially separated liquid chambers is defined in the elastic member such that first axial ends and second axial ends of the liquid chambers are defined by first and second end walls of the elastic member, respectively. The liquid chambers of each pair communicate with each other by a corresponding communication passage including a circumferential passage provided in one of the tubular members, which includes a coil wound coaxially therewith and a yoke provided with at least one gap constituting the circumferential passage. A magnetic fluid fills the liquid chambers and the communication passage(s). The first and second end walls are configured such that when the tubular members are axially displaced relative to each other, a difference is created between volumes of the liquid chambers of each pair.