Patent ID: 7191806

Claim:
An oil injecting apparatus comprising: a bearing seating having a bearing seating surface formed on a front surface thereof and an oil injection through-passage extending through the bearing seating from the front surface to a back surface thereof: a cover member having an injection tube pass-through hole and a suction/exhaust through-passage; an oil container storing oil to a predetermined level and sealed with the cover member; a suction/exhaust tube having one end connected to the suction/exhaust through-passage and the other end connected to a suction/exhaust device; an injection tube passing through the injection tube pass-through hole of the cover member such that the injection tube is capable of vertical movement while maintaining airtightness, the injection tube having a lower end projecting into the oil container and an upper end secured to a lower end of the oil injection through-passage passage of the bearing seating; a distance changing device which changes a distance between the bearing seating and the oil container from an exhaust position in which the lower end of the injection tube is positioned away from an oil level to an injection position in which the lower end of the injection tube is submerged into oil; and bearing fixing means abutting a one-sided-bag-shaped fluid dynamic pressure bearing into which oil is to be injected, for fixing airtight the one-sided-bag-shaped fluid dynamic pressure bearing onto the bearing seating; wherein the one-sided-bag-shaped fluid dynamic pressure bearing is fixed onto the cover member by the bearing fixing means, an inside of the one-sided-bag-shaped fluid dynamic pressure bearing is brought into a vacuum in the exhaust position by the suction/exhaust device, and then in the injection position, the suction/exhaust tube is released to an atmosphere to inject oil in the oil container into the one-sided-bag-shaped fluid dynamic pressure bearing.