Eagle Industry Co., Ltd.

Railway Technical Research Institute

Shinji Nishida

Koichi Mori

Kenji Saito

Masatoshi Itadani

Takeshi Hosoe

Yuta Negishi

Hideki Kawai

Yuki Arai

Masafumi Ogata

Yoshihisa Takano

Keisuke Yoshizawa

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

A check valve () that opens and closes by causing a valve element () to come into contact with and separate from a valve seat () and thereby controls a flow of fluid that flows in through an inlet () and flows out through an outlet (), having a guide portion () that has a fluid guide surface provided at a downside thereof, wherein the valve seat () has a first valve seat and a second valve seat, and the valve element () has a first valve portion () that is to be seated on the first valve seat, a second valve portion () that is to be seated on the second valve seat, and a pressure receiving surface () that extends between the first valve portion () and the second valve portion () in such a manner that a distance between the pressure receiving surface () and the first valve seat gradually reduces.

Check valve

A check valve () that opens and closes by causing a valve element () to come into contact with and separate from a valve seat () and thereby controls a flow of fluid that flows in through an inlet () and flows out through an outlet (). The check valve () has: the inlet () provided at a downside thereof; the outlet () provided at an upside thereof; the valve seat () formed to surround the inlet (); the valve element () configured to be able to come into contact with and separate from the valve seat () vertically; and a guide portion () that has a fluid guide surface () horizontally guiding a fluid flowing in through the inlet (), and a valve element guide surface () provided on a side surface thereof, the valve element guide surface () vertically guiding the valve element.

The present disclosure provides a processing method for preparing at least one sliding part of a pair of sliding parts, and includes a processing step of forming a shallow groove within a range of depth from 0.05 &#x3bc;m to 5 &#x3bc;m on a sealing face of the sliding part by irradiating an ultrashort pulse laser to a part of the sealing face where a positive pressure generation groove and a negative pressure generation groove are formed and removing part of a surface of the sealing face, wherein an energy fluence of the ultrashort pulse laser used in the processing step is 0.5 J/(cm&#xb7;pulse) to 7 J/(cm&#xb7;pulse).

Sliding parts and processing method of sliding parts

A space-saving liquid supply system includes increased cooling efficiency. A first pump chamber Pis formed by an outside of a bellowsin a second vesseland the first pump chamber Pis provided with a first intake portfor taking the liquid in the first vesselinto the first pump chamber Pand a first delivery portfor delivering the taken-in liquid L from inside the first pump chamber Pinto a supply passage K. A second pump chamber Pis formed by a sealed space in the bellowsand the second pump chamber Pis provided with a second intake portfor taking the liquid L in the first vesselinto the second pump chamber Pand a second delivery portfor delivering the taken-in liquid from inside the second pump chamber Pinto the supply passage K

Growing community of inventors

Tokyo, Japan

Shinji Nishida