Patent ID: 7291947

Claim:
An electric rotating machine comprising: a bearing device in which a rotating shaft having a rotor is rotatably supported inside a frame which contains an electric rotating machine main body; a cooling medium circulating system to circulate a cooling medium within the frame to cool the electric rotating machine main body; an oil deflector which is disposed on an outer circumferential surface of the rotating shaft which is on at least one of the inner side and the outer side of the frame of the bearing device and which prevents a lubricant supplied to the bearing device from flowing inside the frame or from flowing outside the frame; a sealing device which is disposed to form a cavity inside the frame and between the bearing device and the oil deflector at the inner side of the frame, and which supplies a sealing medium to the outer circumferential surface side of the rotating shaft to prevent the cooling medium from leaking to the outer side of the frame; and a contact brush seal which is arranged to contact the outer circumferential surface of the rotating shaft, and which prevents contact between (i) the cooling medium and a medium within the seal cavity, (ii) the cooling medium and the sealing medium, (III) the medium within the seal cavity and the seal medium, (iv) the sealing medium and a lubricating medium inside the bearing device, (v) the sealing medium, the lubricating medium inside the bearing device and the outside air, (vi) the sealing medium and the outside air, and (vii) the lubricating medium inside the bearing device and the outside air.