Oiles Corporation

Nissan Motor Company Limited

Okumura Corporation

Masami Mochimaru

Mitsuru Miyazaki

Akio Suzuki

Ikuo Shimoda

Masamitsu Kojima

Takanobu Ide

Sumio Kawaguchi

Susumu Otsuka

Takafumi Fujita

Masaru Iwakura

Kiyoharu Suzuki

Nobuyasu Kawai

Kunio Hayakawa

Masura Iwakura

Kurimoto Kurimoto

Kanemasa Inaba

A damper includes a hollow outer elongated body; a hollow inner elongated body; a liquid viscous body or liquid viscoelastic body disposed in a gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; and first and second attaching structures. Further, a controller may be provided to control an increase or decrease in the internal pressure of the liquid viscous body or the liquid viscoelastic body.

Damper and vibration damping structure using the same

A damper includes a hollow outer elongated body formed of a cylindrical member; a hollow inner elongated body similarly formed of a cylindrical member; a viscous body disposed in a cylindrical gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; rectangular attaching plate members which are respectively secured to a closed-side other end portion, in an axial direction, of the elongated body having one end portion on an open end side and to a closed-side one end portion of the elongated body, respectively; and a holding structure for holding the gap between the inner surface of the elongated body at the one end portion of the elongated body and the outer surface of the elongated body.

A seismic isolation apparatus is structured such that a pair of seismic isolation mechanisms are formed each having a pair of upper and lower clamping members formed in the shape of a rectangular frame, wherein upper and lower roller guide surfaces, in each of which a longitudinal central portion is formed as a concavely arcuate curved surface and portions respectively extending therefrom are formed as convexly arcuate curved surfaces, are formed on the four sides of the upper and lower clamping members, and wherein rollers each having a circular cross section are respectively interposed between the upper and lower roller guide surfaces. The pair of seismic isolation mechanisms are installed by being superposed on top of each other such that the rolling directions of the rollers in the two seismic isolation mechanisms are perpendicular to each other. During the occurrence of an earthquake, the rollers are adapted to roll in contact with the upper and lower roller guide surfaces so as to absorb and dampen seismic waves in the longitudinal and transverse directions of the apparatus.

Seismic isolation apparatus

A passive vibration-damping unit in which movable upper members with a weight mounted thereon are superposed on fixed lower members with roller members interposed therebetween is installed in a highest story of a high-rise building. An active vibration-damping unit for actively causing the movable upper members of the passive vibration-damping unit to move in a shaking manner by means of a servo motor is incorporated in the passive vibration-damping unit. When the vibration of the building has occurred, the weight is allowed to move forcibly in the vibration-damping direction by means of the active vibration-damping unit. When the vibration has reached a limit value of the relative displacement of the active vibration-damping unit or a limit value of the torque of the servo motor, only the operation of the passive vibration-damping unit is continued. When the vibration has subsided to a certain extent, the active vibration-damping unit is operated again.

Method of and apparatus for damping the vibration of a building

A vibration damper for damping roll vibration of a power unit mounted on a vehicle body. The vibration damper is composed of a disc plate fixedly connected to the power unit in a manner that the axis of the disc plate is generally parallel with a roll axis of the power unit. The disc plate is sealingly disposed in a chamber formed in a generally circular casing which is coaxial with the disc plate. A viscous fluid is filled in a space defined between the disc plate and inner surface of the casing. The casing is formed of a plastic which has a higher linear expansion coefficient than a metal forming the disc plate, thereby allowing the space filled with the viscous fluid to expand along with thermal expansion of the viscous fluid.

Vibration damper for power unit

A damper used to damp roll vibration of an automotive power unit includes housing in which a disc is immersed in a highly viscous liquid, and a linkage which has universal joints formed at each end thereof. The linkage induces relative rotation between the housing and the disc. A resilient vibration attenuating arrangement is included in one or both of the universal joints for insulating the vehicle chassis from vibration which tends to be freely transmitted through the damper per se and cause cabin reverberation noise.

Damper unit for automotive power unit or the like

A damper comprises housing in which a disc is immersed in a highly viscous liquid, and a linkage which has universal joints formed at each end thereof. The linkage arrangement ensures the maximum amount of relative rotation between the housing and the disc.

Growing community of inventors

Minato-ku, Japan

Masami Mochimaru