Eagle Industry Co., Ltd.

Railway Technical Research Institute

Yoshihisa Takano

Hidekazu Takahashi

Yuki Arai

Masafumi Ogata

Shinji Nishida

Keisuke Yoshizawa

The shaft seal device includes a seal cover formed in a tubular shaped and provided on an outer periphery of a rotation shaft which is inserted into an axial hole of a housing, a flexible member that connects the seal cover to the housing, an auxiliary seal portion provided on an interior side of the shaft seal device in an axial direction of the seal cover, a magnetic fluid seal portion provided on an exterior side of the shaft seal device from the auxiliary seal portion in the axial direction of the seal cover, and bearings that support a load of the magnetic fluid seal portion.

Shaft seal device

A magnetic fluid sealing structure () for high-speed rotation for sealing a gap (S) between a shaft member () and a housing member () disposed around the shaft member (), which are rotatable, includes: magnetic force generating means () which is fixed to the housing member () and generates a magnetic force; magnetic pole members () disposed on both sides in an axial direction of the magnetic force generating means (); and a magnetic fluid () which is magnetically held between the magnetic pole members () and the shaft member () by the magnetic force of the magnetic force generating means () and seals the gap (S) therebetween, in which the shaft member () has a plurality of different material layers concentrically laminated in a radial direction, and an outermost diameter layer () of the shaft member (), which holds the magnetic fluid (), is made of a magnetic material.

Magnetic fluid sealing structure for high-speed rotation

Growing community of inventors

Tokyo, Japan

Yoshihisa Takano