Kyb Corporation

Kayaba Industry Company, Ltd.

Kazuhisa Nakamura

Keiji Saito

Takashi Teraoka

A piston of a magnetorheological fluid shock absorber is provided with a piston core having a small diameter portion mounted on an end portion of the piston rod, an enlarged diameter portion formed continuously in an axial direction with a diameter larger than the small diameter portion and forming a stepped portion, and a large diameter portion formed continuously in the axial direction with a diameter larger than the enlarged diameter portion and having a coil; a ring body surrounding the outer periphery of the piston core and forming a flow passage of the magnetorheological fluid between itself and the large diameter portion; a plate formed annularly and arranged on the outer periphery of the small diameter portion and mounted on one end of the ring body; and a stopper mounted on the small diameter portion and sandwiching the plate between the stopper and the stepped portion.

Magnetorheological fluid shock absorber

A magnetorheological fluid damper using magnetorheological fluid, whose viscosity changes according to an intensity of a magnetizing field, as working fluid includes a cylinder in which magnetorheological fluid is sealed, a piston which is slidably arranged in the cylinder, a first fluid chamber and a second fluid chamber which are partitioned by the piston, a main flow passage which is open on opposite end surfaces of the piston and allows communication between the first and second fluid chambers, an electromagnetic coil which generates a magnetizing field to be applied to the magnetorheological fluid flowing in the main flow passage, a bypass flow passage which is formed at a position less affected by the magnetizing field generated by the electromagnetic coil than the main flow passage, and a bypass branching portion which branches the bypass flow passage from the main flow passage.

Magnetorheological fluid damper

A magnetorheological fluid shock absorber includes a piston slidably arranged in a cylinder in which magnetorheological fluid is sealed. The piston includes a piston core which is attached to an end part of a piston rod and on the outer periphery of which a coil is provided, a flux ring which surrounds the outer periphery of the piston core and forms a flow passage for the magnetorheological fluid between the piston core and the flux ring, a first plate which is arranged on the outer periphery of the piston rod and specifies the position of one end of the flux ring in an axial direction with respect to the piston core, a second plate which is arranged on the inner periphery of the other end of the flux ring, and a first snap ring which is fitted to the inner periphery of the flux ring and fixes the second plate.

Growing community of inventors

Kanagawa, Japan

Kazuhisa Nakamura