Abstract: A vibration damping device including: first and second mounting members; a main rubber elastic body elastically connecting the two members; and a bracket member fit into the first mounting member. A projecting part projects outward from a circumference of the first mounting member, and includes a locking groove whose inner surface is covered by a rubber coating layer and has a locking part on its side wall inner surface. An engaging projection projecting from the bracket member is fit into the locking groove, and a projection tip surface of the engaging projection is abutted on a bottom wall inner surface of the locking groove. A side surface of the engaging projection is locked to the locking part so as to constitute a positioning member that positions the first mounting member and the bracket member to each other.

Abstract: A vibration damping device including: first and second mounting members; a main rubber elastic body elastically connecting the two members; and a bracket member fit into the first mounting member. A projecting part projects outward from a circumference of the first mounting member, and includes a locking groove whose inner surface is covered by a rubber coating layer and has a locking part on its side wall inner surface. An engaging projection projecting from the bracket member is fit into the locking groove, and a projection tip surface of the engaging projection is abutted on a bottom wall inner surface of the locking groove. A side surface of the engaging projection is locked to the locking part so as to constitute a positioning member that positions the first mounting member and the bracket member to each other.

Abstract: A post-formation filling type fluid filled vibration damping device wherein a first communication groove, which interconnects a plurality of through holes, is formed in a partition member that separates a pressure receiving chamber and an equilibrium chamber, the groove being formed in a surface of the partition member that opposes a flexible membrane. In addition, a second communication groove, which connects an orifice passage and at least one of the plurality of through holes, is formed in the surface of the partition member that opposes the flexible membrane.

Abstract: A post-formation filling type fluid filled vibration damping device wherein a first communication groove, which interconnects a plurality of through holes, is formed in a partition member that separates a pressure receiving chamber and an equilibrium chamber, the groove being formed in a surface of the partition member that opposes a flexible membrane. In addition, a second communication groove, which connects an orifice passage and at least one of the plurality of through holes, is formed in the surface of the partition member that opposes the flexible membrane.

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: 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 stopper structure including: a rigid abutting member extending in its longitudinal direction with a rectangular cross sectional shape; and a rubber stopper having a base portion of tubular cross sectional shape and secured press-fit onto the rigid abutting member without being adhesive thereto, two peripheral projections formed on laterally opposite sides of a first abutting plane of the base portion and extending in the longitudinal direction, and a central projection formed on an intermediate area interposed between the peripheral projections of the first abutting plane of the base portion. The peripheral projections are situated above laterally opposite edges of a first abutting plane of the rigid abutting member, and have a width dimension extending inside and outside the laterally opposite edges. The central projection projects outward from the first abutting plane of the base portion with the same height as the peripheral projections.

Abstract: There is provided a vibration damping device including; a pair of rubber arm portions connecting an inner fitting and an outer fitting to each other in the horizontal direction; and a rubber leg portion connecting in the vertical direction; the paired rubber arm portions are formed so that the thickness thereof decreases gradually from the inner fitting side toward the outer fitting side, and the rubber leg portion is formed so that each of both side surfaces is formed by an inwardly depressed curved surface, and is formed into a curved broaden shape toward the outer fitting side. Thereby, a spring constant in the horizontal direction is increased advantageously while a spring constant in the vertical direction kept large, and the durability of the rubber elastic body can be increased effectively.

Abstract: A cylindrical vibration damping apparatus having an elastic body connecting an inner shaft and an outer cylinder member, and a pair of rubber stop plates disposed at axial ends of the inner shaft member. Each rubber stop plate has a mount hole that fits about the outside of the inner shaft member. Pairs of mating projections and mating recesses are provided to an interface between an inner circumferential surface of the mount hole of the each rubber stop plate and an outer circumferential surface of the corresponding axial end of the inner shaft member at three or more different intervals in a circumferential direction so that the pair of rubber stop plates are installed onto the axial ends of the inner shaft member with correct identification of a front and back and a circumferential position about the inner shaft member. A method of manufacturing the same is also disclosed.

Abstract: A stopper structure including: a rigid abutting member extending in its longitudinal direction with a rectangular cross sectional shape; and a rubber stopper having a base portion of tubular cross sectional shape and secured press-fit onto the rigid abutting member without being adhesive thereto, two peripheral projections formed on laterally opposite sides of a first abutting plane of the base portion and extending in the longitudinal direction, and a central projection formed on an intermediate area interposed between the peripheral projections of the first abutting plane of the base portion. The peripheral projections are situated above laterally opposite edges of a first abutting plane of the rigid abutting member, and have a width dimension extending inside and outside the laterally opposite edges. The central projection projects outward from the first abutting plane of the base portion with the same height as the peripheral projections.

Abstract: There is provided a vibration damping device including; a pair of rubber arm portions connecting an inner fitting and an outer fitting to each other in the horizontal direction; and a rubber leg portion connecting in the vertical direction; the paired rubber arm portions are formed so that the thickness thereof decreases gradually from the inner fitting side toward the outer fitting side, and the rubber leg portion is formed so that each of both side surfaces is formed by an inwardly depressed curved surface, and is formed into a curved broaden shape toward the outer fitting side. Thereby, a spring constant in the horizontal direction is increased advantageously while a spring constant in the vertical direction kept large, and the durability of the rubber elastic body can be increased effectively.

Abstract: A fluid-filled vibration-damping mount of suspension type, wherein a lower open-end of a second mounting member is fluid-tightly closed by a first mounting member and a tapered elastic body interposed therebetween. An upper open-end portion of the cylindrical portion is closed by a flexible layer for forming a fluid chamber between the elastic body and the flexible layer, which is divided by a partition member into a pressure-receiving chamber defined by the elastic body and an equilibrium chamber defined by the flexible layer, which are mutually communicated through an orifice passage. A pair of elastic restricting projections bonded to the partition member at respective circumferential positions with a circumferential length smaller than a half of a circumference of the partition member, project toward a circumferential region defined between the elastic body and the second mount member, for narrowing the region.

Abstract: A fluid-filled vibration-damping device including: a first mounting member; a second mounting member; an elastic body elastically connecting the first and second mounting members and defining a fluid-sealing area filled with a non-compressible fluid; and a gas-retaining hole open to the fluid-sealing area through an opening thereof, and capable of retaining a predetermined volume of gas therein with the opening thereof facing vertically upward within the non-compressible fluid. A method of manufacturing the fluid-filled vibration-damping device is also disclosed.

Abstract: A cylindrical vibration damping apparatus having an elastic body connecting an inner shaft and an outer cylinder member, and a pair of rubber stop plates disposed at axial ends of the inner shaft member. Each rubber stop plate has a mount hole that fits about the outside of the inner shaft member. Pairs of mating projections and mating recesses are provided to an interface between an inner circumferential surface of the mount hole of the each rubber stop plate and an outer circumferential surface of the corresponding axial end of the inner shaft member at three or more different intervals in a circumferential direction so that the pair of rubber stop plates are installed onto the axial ends of the inner shaft member with correct identification of a front and back and a circumferential position about the inner shaft member. A method of manufacturing the same is also disclosed.

Abstract: A stopper structure including: a rigid abutting member extending in its longitudinal direction with a rectangular cross sectional shape; and a rubber stopper having a base portion of tubular cross sectional shape and secured press-fit onto the rigid abutting member without being adhesive thereto, two peripheral projections formed on laterally opposite sides of a first abutting plane of the base portion and extending in the longitudinal direction, and a central projection formed on an intermediate area interposed between the peripheral projections of the first abutting plane of the base portion. The peripheral projections are situated above laterally opposite corners of a first abutting plane of the rigid abutting member, and have a width dimension extending inside and outside the corners. The central projection projects outward from the first abutting plane of the base portion with a height smaller than that of the peripheral projections.

Abstract: A fluid-filled elastic mount of suspension type, wherein a lower open-end of a cylindrical portion of a second mounting member is fluid-tightly closed by a first mounting member and a tapered elastic body interposed therebetween, extending from the lower open-end into the cylindrical portion. An upper open-end portion of the cylindrical portion is closed by a flexible layer for forming a fluid-filled chamber between the elastic body and the flexible layer and being divided by a partition member into a pressure-receiving chamber defined by the elastic body and an equilibrium chamber defined by the flexible layer, which are held in communication by an orifice passage An elastic restricting projection is bonded to the partition member to protrude and be located in an intermediate portion between the radially opposite elastic body and the cylindrical portion, for restricting an annular region of the intermediate portion.

Abstract: A fluid-filled vibration-damping mount of suspension type, wherein a lower open-end of a second mounting member is fluid-tightly closed by a first mounting member and a tapered elastic body interposed therebetween. An upper open-end portion of the cylindrical portion is closed by a flexible layer for forming a fluid chamber between the elastic body and the flexible layer, which is divided by a partition member into a pressure-receiving chamber defined by the elastic body and an equilibrium chamber defined by the flexible layer, which are mutually communicated through an orifice passage. A pair of elastic restricting projections bonded to the partition member at respective circumferential positions with a circumferential length smaller than a half of a circumference of the partition member, project toward a circumferential region defined between the elastic body and the second mount member, for narrowing the region.

Abstract: A vibration isolator includes a first metallic mounting member; a metallic body member disposed away from the first metallic mounting member in the vibration input direction; an elastic body portion elastically connecting the first metallic mounting member and the metallic body member; and a second metallic mounting member. The metallic body member includes a flange portion protruding radially outward from a part of its end facing the first metallic mounting member and a first protrusion protruding radially outward from the remaining part of the end to a greater extent than does the flange portion. The opposite end of the metallic body member is plugged with a seal member to thereby form a liquid chamber within the metallic body member. The second metallic mounting member is fixedly press-fitted onto the metallic body member and includes a second protrusion. The first and second protrusions are superposed to thereby form a stopper portion. The stopper portion is covered and held by a stopper covering portion.

Abstract: A fluid-filled vibration-damping device including: a first mounting member; a second mounting member; an elastic body elastically connecting the first and second mounting members and defining a fluid-sealing area filled with a non-compressible fluid; and a gas-retaining hole open to the fluid-sealing area through an opening thereof, and capable of retaining a predetermined volume of gas therein with the opening thereof facing vertically upward within the non-compressible fluid. A method of manufacturing the fluid-filled vibration-damping device is also disclosed.

Abstract: A vibration isolator includes a first metallic mounting member; a metallic body member disposed away from the first metallic mounting member in the vibration input direction; an elastic body portion elastically connecting the first metallic mounting member and the metallic body member; and a second metallic mounting member. The metallic body member includes a flange portion protruding radially outward from a part of its end facing the first metallic mounting member and a first protrusion protruding radially outward from the remaining part of the end to a greater extent than does the flange portion. The opposite end of the metallic body member is plugged with a seal member to thereby form a liquid chamber within the metallic body member. The second metallic mounting member is fixedly press-fitted onto the metallic body member and includes a second protrusion. The first and second protrusions are superposed to thereby form a stopper portion. The stopper portion is covered and held by a stopper covering portion.