Tokai Rubber Industries, Ltd.

Koichi Maeda

Hajime Maeno

Rentaro Kato

Koichi Hasegawa

Kazuhiko Kato

Katsuhiro Goto

Kei Okumura

Takahiro Aoi

A fluid filled vibration damping device including: an elastic body elastically connecting a first and a second mounting member and partially defining a pressure receiving chamber filled with a non-compressible fluid and undergoing fluid pressure variation upon application of vibrational load between the first and second mounting members; a flexible diaphragm partially defining an equilibrium chamber filled with the non-compressible fluid and whose volume is variable; and an orifice passage permitting a fluid communication between the pressure-receiving chamber and the equilibrium chamber. The flexible diaphragm is constituted by a rubber elastic layer having an annular thick-walled portion and a central thick-walled portion situated at a substantially central portion of an inner area surrounded by the annular thick-walled portion, while being independent of the annular thick-walled portion.

Fluid filled vibration damping device whose flexible layer having thick walled portion

A fluid filled vibration damping device including: an elastic body elastically connecting a first and a second mounting member and partially defining a pressure receiving chamber filled with a non-compressible fluid; a flexible diaphragm partially defining an equilibrium chamber filled with the non-compressible fluid and connected to the pressure-receiving chamber via an orifice passage. The first mounting member includes an elastic-body-side central member bonded to the elastic body central portion, and a rubber-layer-side central member bonded to the flexible rubber layer central portion, both mutually superposed on and fastened together by a connecting bolt. A fitting recess and projection are formed at an interface between two members, and a mounting projection projecting outward on an opposite side from the interface. The connecting bolt is off-centered from a center of the two members by a give distance.

Fluid filled vibration damping device

A fluid filled vibration damping device includes an elastic body connecting a first and a second mounting member to close one opening of the second mounting member, and a lid member is fixed caulkwise to a shoulder of the second mounting member to close the other opening of the second mounting member, thereby providing a fluid chamber filled with a noncomporessible fluid. A partition member of outside diameter smaller than the inside diameter of the cylindrical caulking portion is formed with engaging projections rising up with a uplift cutout form. The engaging projections is fit into the second mounting member with the partition member superimposed on the shoulder so that the second mounting member is positioned in an axis-perpendicular direction to the second mounting member. Cutout openings left after the engaging projections have been formed are closed by a sealing portion.

A vibration-damping device for damping vibrations of a vibrative member, which includes a damper mass member having a rigid abutting portion, a spring member for elastically connecting the damper mass member to the vibrative member to cooperate with the damper mass member to constitute a second vibration system whose natural frequency is tuned to a frequency band of the vibrations of the vibrative member, and an independent mass member disposed so as to be opposed to the rigid abutting portion in a vibration input direction with a given gap therebetween without being adhesive to the rigid abutting portion. The independent mass member is independently displaceable relative to and brought into abutting contact directly and elastically with said rigid abutting portion in said vibration input direction.

Vibration-damping device

A vibration-damping device includes a housing member and a pillar-shaped mass member housed within an accommodation space of the housing member with a slight spacing therebetween so that the mass member is freely displaceable within the accommodation space to come into impact on the housing member. A rubber buffer and an abutting rubber member integrally formed with each other and fixed to at least one of axial end portions of the mass member such that the rubber buffer covers an outer circumferential surface of the end portion of the mass member, and the abutting rubber member disposed over an end face of the axial end portion of the mass member. A void is formed between the abutting rubber member and the end portion of the mass member so that the abutting rubber member undergoes shear deformation upon an impact of the mass member on the housing member at the abutting rubber member.

Disclosed is a vibration-damping device comprising an abutting member adapted to be fixedly disposed in a vibrative member and an independent mass member disposed relative to the abutting member such that the independent mass member is displaceable relative to the abutting member while being independent of the abutting member without being adhesive to the abutting member. The independent mass member having an abutting surface that comes into abutting contact directly and elastically with an abutting surface of the abutting member, in which at least one of the abutting surfaces of the abutting member and the independent mass member is provided with a flock coating.

Growing community of inventors

Nishikamo-gun, Japan

Koichi Maeda