JP2005249205A5 - - Google Patents

Claims (10)

A bearing device comprising a pair of grease-lubricated rolling bearings, a housing externally fitted to the rolling bearing, and a grease replenishing mechanism having a grease replenishing hole for replenishing grease to the bearing space of the rolling bearing. There,
The grease replenishing hole is opened in the inner surface of the outer ring of the rolling bearing, and a grease discharging space is provided on the opposite side of the bearing space of each of the pair of rolling bearings from the side facing the other rolling bearing. The bearing device is characterized in that suppression means for suppressing the movement of the grease from each bearing space toward the bearing space of the other rolling bearing during grease replenishment is provided between the pair of rolling bearings. A bearing device comprising a grease-lubricated rolling bearing, a housing externally fitted to the rolling bearing, and a grease replenishing mechanism having a grease replenishing hole for replenishing grease to a bearing space of the rolling bearing. ,
The grease supply hole is opened in the inner surface of the outer ring of the rolling bearing, and a grease discharging space is provided on both axial sides of the bearing space of the rolling bearing in the housing. 3. The bearing device according to claim 1, wherein the grease replenishing hole is opened at a position shifted from a contact point in the outer ring raceway of the outer ring inner diameter surface. The bearing device according to claim 2, further comprising a spacer that abuts on a raceway of the rolling bearing, wherein the spacer is provided with at least a part of the grease discharge space. The grease discharge space provided on both sides in the axial direction of the bearing space is configured such that one space is narrower than the other space, and more grease is discharged from the one narrow space to the other wider space. The bearing device according to 2 or 4. The bearing device according to claim 1, wherein a seal member is provided on one side in the axial direction of the bearing space, and a large amount of grease is discharged to a grease discharge space opposite to the side on which the seal member is provided. . The bearing device according to claim 1, further comprising a suction passage that communicates with the grease discharge space and sucks the grease periodically, and the grease is sucked from the grease discharge space through the suction passage. The bearing device according to any one of claims 1 to 7, wherein the bearing device is used in a high-speed rotation range exceeding dmN 1.5 million after filling the bearing space with grease and performing a break-in operation. A spindle device in which a spindle for a machine tool spindle is supported by the bearing device according to claim 1. A spindle device in which an AC servo motor spindle is supported by the bearing device according to claim 1.