Abstract: There is provided is sliding body surface evaluation method and apparatus configured so that a temporal change in a transformed portion at a sliding portion of a sliding body can be observed. The method includes a first step of irradiating, with an electromagnetic wave, a sliding portion of a sliding body sliding on a sliding target body, a second step of detecting light emitted from the sliding portion irradiated with the electromagnetic wave, and a third step of deriving a change in a light emission state of the sliding portion.

Abstract: The seal structure includes a shaft member, a bush having a shaft hole for passing the shaft member, a pressure-receiving member having a facing surface facing an end surface of the bush on one side in the direction of the axis, and an elastic member that presses the bush against the pressure-receiving member from another side in the direction of the axis, in which a first coating layer is formed between an outer peripheral surface of the shaft member and an inner peripheral surface of the shaft hole of the bush, and a second coating layer is formed between the end surface of the bush on one side in the direction of the axis and the facing surface of the pressure-receiving member.

Abstract: There is provided is sliding body surface evaluation method and apparatus configured so that a temporal change in a transformed portion at a sliding portion of a sliding body can be observed. The method includes a first step of irradiating, with an electromagnetic wave, a sliding portion of a sliding body sliding on a sliding target body, a second step of detecting light emitted from the sliding portion irradiated with the electromagnetic wave, and a third step of deriving a change in a light emission state of the sliding portion.

Abstract: A filter device (100) includes an annular filter (110) provided on a shaft (10) and a rotary seal (120) for sealing an annular gap between the filter (110) and a housing (20). The rotary seal (120) includes an annular magnet (140) provided on the filter (110) and a flexible annular sealing member (130) provided on the housing (20). The sealing member (130) is provided on an upstream side of the magnet (140) and includes an annular opposing portion (132) that opposes the magnet (140) in an axial direction, and a magnetic fluid (150) soaked into the opposing portion (132). The opposing portion (132) makes contact with the magnet (140).

Abstract: A filter device (100) includes an annular filter (110) provided on a shaft (10) and a rotary seal (120) for sealing an annular gap between the filter (110) and a housing (20). The rotary seal (120) includes an annular magnet (140) provided on the filter (110) and a flexible annular sealing member (130) provided on the housing (20). The sealing member (130) is provided on an upstream side of the magnet (140) and includes an annular opposing portion (132) that opposes the magnet (140) in an axial direction, and a magnetic fluid (150) soaked into the opposing portion (132). The opposing portion (132) makes contact with the magnet (140).

Abstract: A magnetic fluid seal is provided, capable of producing a stable scaling performance by stably holding magnetic fluid in place between two members, even in cases when the two members become eccentric. The magnetic fluid seal includes: an annular magnetic circuit forming member that is disposed on a housing; an annular member that is disposed on a shaft; and a magnetic fluid that is magnetically held between axially opposing surfaces of the magnetic circuit forming member and the annular member. In addition, the annular member comprises a flexible member that is swayable so that a portion of the annular member that opposes the magnetic circuit forming member follows the magnetic circuit forming member.

Abstract: A magnetic fluid seal is provided, that is capable of producing a stable sealing performance by stably holding the magnetic fluid in place, even in cases when the two members become eccentric. The magnetic fluid seal includes: an annular magnetic circuit forming member 100 that is disposed on a housing 600; an annular member 200 that is disposed on a shaft 500; and a magnetic fluid 300 that is magnetically held between axially opposing surfaces of the magnetic circuit forming member 100 and the annular member 200. In addition, the annular member 200 comprises a flexible member that is swayable so that a portion of the annular member 200 that opposes the magnetic circuit forming member 100 follows the magnetic circuit forming member 100.