Nippon Thompson Co., Ltd.

Ichiro Masuda

Osamu Suzuki

Takehiko Hara

A cross roller bearing is disclosed that achieves a long service life by reducing the effects of split surfaces formed in an outer ring in the direction that crosses a V-shaped groove of said outer ring. In addition, a cross roller bearing is disclosed that allows said effects to be reduced at low cost. The above-mentioned advantages are obtained by forming a recess in the outer surface of said outer ring corresponding to said split surfaces to reduce the preliminary pressure applied to rollers at that portion. In addition, the above-mentioned advantages are achieved at low cost by the filling of a filling member and the setting of the angle at which said split surfaces cross said V-shaped groove.

Cross roller bearing

A rolling contact type rotary bearing assembly includes a pair of inner and outer rings and a plurality of rolling members interposed therebetween to provide a relative rotation between the inner and outer rings. An insertion hole is provided in at least one of the inner and outer rings such that the plurality of rolling members may be inserted into the annular path defined between the inner and outer rings. A closure member is also provided to close the insertion hole after insertion of the rolling members into the annular path. The closure member is formed with a lubrication hole so that a lubricant may be provided to the annular path to allow a smooth rolling movement of the rolling members. A lubricant supply hole may also be provided in either of the outer and inner rings in communication with the lubrication hole of the closure member so as to allow to supply a lubricant to the annular path from the exterior.

Lubricatable rotary bearing assembly

A crossed roller bearing assembly includes an outer ring provided with an outer V-shaped guide groove, an inner ring provided with an inner V-shaped guide groove and a plurality of rollers arranged in a guide space defined between the outer and inner V-shaped guide grooves in a rolling contact fashion. An insertion hole is formed in one of the outer and inner rings and the insertion hole preferably has a diameter which is larger than the diameter of the rollers, but smaller than a diagonal length in cross section of the rollers. A plug having a shape which substantially corresponds to the shape of the insertion hole is fitted into the insertion hole after insertion of the rollers. No gap or clearance is defined between the insertion hole and the plug so that the rollers can roll along the guide space smoothly.

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Hyogo, Japan

Ichiro Masuda