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■Advantage of greasing (oiling) As described below, periodical greasing (or oiling) will improve the performance of self-lubricating bearings : ●Reduction of co-efficient of friction and wear amount ●Increase of allowable PV value ●Improved reliability and safety ●Discharge of wear particles and improvement of foreign particle tolerance. ●Rust-proof of the mating shaft ●Cooling effect Lubricating oil : industrial lubricating oil ISO VG22 to 46 [kinematic viscosity 22 to 46 s+ / 40℃] Grease : Litheum based multi-purpose grease (with consistency of NLG 2 to 0) ※If operating temperature goes beyond 150℃, the grease which uses polyurea or bentonite as a thickner could be specified. ■Oil hole and oil groove design Configuration of oil holes and oil grooves of the bearings should be designed as below: ●An oil hole and an oil groove should be at the same location avoiding the point of maximum load. ●An oil groove in an axis direction should be 70 to 80 % of the bearing length and all edges should be chamfered. ●If lubricant is supplied from the housing, circumferential groove on the outer diameter should be designed in order to avoid inadequate lubrication from clogged oil hole caused by shifting of the oil hole from the housing oil path. Bearing I.D. 30 or less 30 to 50 50 to 80 80 to 120 120 to 180 180 to 250 250 to 315 315 to 400 400 to 500 Number of groove 1 to 2 3 3 4 4 5 6 8 8 H 1.2 1.8 2.5 3.5 5.0 6.0 7.0 8.0 8.0 r 1.5 2.0 3.0 3.5 4.0 5.0 6.0 7.0 8.0 R 1.5 2.0 3.0 3.5 4.0 5.0 6.0 7.0 8.0 (Unit : mm) Examples of typical dimensions of oil grooves: Oil groove Oil hole Circumferential groove H R r Oil hole and oil groove Cross sectional configuraton of oil groove 340 Selection Guide Product Information Plastic Bearing Multi-layer Bearing Metallic Bearing Air Bearings Technical Slide Shifter Information Corporate Profi le Technical Information