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On Design ■Bearing configuration Selection and Design of Oiles Bearings ※Influence of the bearing length described here is reference. Length In general, length of the bearings is calculated by the ratio of the bearing length (L) and I.D. (D) of the bearing. (L/D) For geneal use : L/D= 0.5 to 2.0. For high load, high velocity, uneven contact : L/D=0.8 to 1.0. L / D : Small Small Large High Small Large Large L / D : Large Large Small Low Large Small Small Effect of bearing length Oil film formation capability Heat radiation Safety margin for eccentric load Vibration damping Space saving Discharge of particles (Unit : mm) Wall thickness Wall thicknes of the bearings can be made thinner to realize smaller design. ID and wall thickness Oil impregnatd metallic bearing Plugged metallic bearing Plastic bearing (machined ) Plastic bearing( molded) Multi-layer bearing Composite bearing( Hiplast) φ300 20 to 25 20 to 30 20 to 25 (20 to 30) − φ100 7.5 to 12.5 10 to 15 7.5 to 12.5 5 to 10 2.5 φ50 5 to 7.5 7.5 to 10 5 to 7.5 3 to 5 2 to 2.5 φ20 2 to 4 3 to 5 2 to 4 1 to 3 1.5 φ10 2 to 3 3 to 4 2 to 3 1 to 2 1 0.5 Regardless of bearing diameter, wall thickness is 0.5mm Chamfering Both ends of bearings are chamfered to avoid stress concentration. Bearing ID φd Up to φ80 φ80 to φ200 φ200 to φ300 Over φ300 Chamfer size of ID and OD C0.5 C1.0 C1.5 C2.0 (Unit : mm) t=(0.05 to 0.07)d+(2 to 5)mm I.D. Chamfer I.D. Chamfer O.D. Chamfer O.D. Chamfer L I.D. φd I.D. φd φD (I.D.) Wall thickness t OILES 500 The shape of The Chamfering. Placement of a solid lubricant is not plugged to both ends part. Therefore it do chamfering to a position of a plugged solid lubricant to prevent seize by partial metallic contact. C l〜 C 5 1 r Sliding surface 339Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter