iglide L250 Made specifically for applications with high rotations Very low coefficients of friction Excellent wear resistance

Transcription

1 Made specifically for applications with high rotations Very low coefficients of friction Excellent wear resistance 299

2 - For high speeds For fast rotating applications Specially made for fast rotating applications Plain bearings for high speed rotation applications, especially for fans and motors. Very low coefficients of friction Excellent wear resistance For rotating applications at high speed If highest service life is required Low load applications If low noise level is required For very low coefficients of friction When high pressure loads occur Q L280 When sustained temperatures above 194 F is a condition V400 When low moisture absorption is required H1 J vailable from stock Detailed information about delivery time online. F max F min. 40 F $ Price breaks online No minimum order. mm Ø 6 to 20 mm more dimensions on request Typical application areas utomotive Electronics industry Mechatronics Test engineering and Optical industry quality assurance 300 Lifetime calculation, configuration and more

3 - Technical Data Material Properties Table General Properties Unit Testing Method Density g/cm Color beige Max. moisture absorption at 73 F / 50% r.h. % weight 0.7 DIN Max. moisture absorption % weight 3.9 Coefficient of friction, dynamic against steel µ pv value, max. (dry) psi x fpm 11,500 Mechanical Properties Modulus of elasticity psi 282,800 DIN Tensile strength at 68 F psi 9,718 DIN Compressive strength psi 6,817 Permissible static surface pressure (68 F) psi 6,527 Shore D-hardness 68 DIN Physical and Thermal Properties Max. long-term application temperature F 194 Max. application temperature, short-term F 356 Min. application temperature F -40 Thermal conductivity W/m x K 0.24 STM C 177 Coefficient of thermal expansion K -1 x DIN Electrical Properties Specific volume resistance Ωcm > DIN IEC 93 Surface resistance Ω > DIN Compressive Strength With increasing temperatures, the compressive strength of plain bearings decreases. The Graph shows this inverse relationship. However, at the long term maximum temperature of +194 F the permissible surface pressure is almost 2,901 psi. Compressive strength, Page 63 Deformation (%) ,176 4,351 6, F 73 F Deformation under load and temperature 145,000 14,500 1,450 Permissible Surface Speeds has been developed especially for high surface speeds with low loads. Besides the physical limit, which is preset by the heating of the bearing, the coefficients of wear are also limited if rapidly high glide paths emerge at high peripheral speeds and the permitted wear limit is thus reached earlier. The maximum speeds are show in the table to the right Surface Speed (fpm) 1.97 Permissible pv values for running dry against a steel shaft, at 68 F ,969 Surface speed, Page 64 pv value, Page 65 Continuous Short Term fpm fpm Rotating Oscillating Linear Maximum surface speeds 3D-CD files, prices and delivery time 301

4 - Technical Data Temperatures plain bearings can be used at temperatures from -40 F up to 194 F. The short-term maximum temperature is 356 F. Note that a mechanical securing of the bearing is recommended from temperatures of 131 F. Higher temperatures can also cause the bearing to lose its pressfit seating and move in the housing. pplication temperatures, Page Temperature ( F) Recommended maximum permissible static surface pressure of as a result of the temperature pplication Temperature Minimum - 40 F Max. long-term +194 F Max. short-term +356 F dditional axial securing +131 F Temperature limits for Friction and Wear The best pairing of bearings is with 304 stainless steel shafts where coefficients of friction of 0.14 are already attained at low loads. Coefficients of friction below 0.1 have already been measured for values below 1,450 psi. Coefficients of friction and surfaces, Page 68 Wear resistance, Page Coefficient of friction (µ) Coefficient of friction (µ) ,450 2,901 4,351 5,802 7,252 8,702 10,150 11,600 Surface Speed (fpm) Coefficients of friction of as a function of the running speed; p = 108 psi Coefficients of friction of as a function of the load, v = 1.96 fpm Coefficient of Friction Dry Grease 0.09 Oil 0.04 Water 0.04 Coefficient of friction of against steel (Shaft finish = 40 rms, 50 HRC) 302 Lifetime calculation, configuration and more

5 - Technical Data Shaft Materials s shown in the graphs, a variety of shafts can be used at low loads and low rotation. The good coefficients of friction are maintained across a wide range of recommended shaft roughness values. With regards to loads greater than 145 psi the shaft material selection becomes more important. Shaft Materials, Page 71 Wear (µm/km) Hard anodized aluminum utomatic screw steel 1050 Steel 1050, hard chromed HR carbon steel 304 Stainless 440B Wear of, rotating applications with different shaft materials, p=108 psi, v=98 fpm Wear (µm/km) Rotating Oscillating Wear with different shaft materials, oscillating and rotating movement p = 290 psi 5076 Wear (µm/km) Steel 304 Stainless HR carbon steel Hard chromed Wear of with different shaft materials in rotational applications 290 Installation Tolerances plain bearings are meant to be oversized before being pressfit. fter proper installation into a recommended housing bore, the inner diameter adjusts to meet our specified tolerances. Please adhere to the catalog specifications for housing bore and recommended shaft sizes. This will help to ensure optimal performance of plain bearings. Tolerance table, Page 75 Testing methods, Page 76 For Inch Size Bearings Length Tolerance (b1) Length (inches) Tolerance (h13) (inches) Length of Chamfer (f) Based on d to / f =.012 d to / to / to / to / to / f =.019 d 1 > f =.031 d 1 > f =.047 d 1 > 1.18 For Metric Size Bearings f 30 Length of chamfer b (0.5 mm) Length 30 Length Tolerance (b1) Length (mm) Tolerance (h13) (mm) Length of Chamfer (f) Based on d1 1 to 3-0 /-140 f = 0.3 d mm > 3 to 6-0 /-180 f = 0.5 d 1 > 6-12 mm > 6 to 10-0 /-220 f = 0.8 d 1 > mm >10 to 18-0 /-270 f = 1.2 d 1 > 30 mm >18 to 30-0 /-330 >30 to 50-0 /-390 >50 to 80-0 /-460 3D-CD files, prices and delivery time 303

6 - Technical Data Chemical Resistance bearings are resistant to diluted alkalis and very weak acids as well as solvents and all types of lubricants. Chemical table, Page 1364 Reduction of inner ø (%) Medium Resistance lcohol + to 0 Hydrocarbon + Greases, oils without additives + Fuels + Weak acids 0 to Strong acids Weak alkaline + Strong alkaline 0 + resistant, 0 conditionally resistant, not resistant Moisture absorption (weight %) Effect of moisture absorption on plain bearings Chemical resistance of ll data given concerns the chemical resistance at room temperature (68 F). For a complete list, see Page 1364 Radiation Resistance Plain bearings made from are radiation resistant up to an intensity of 3 x 10 4 Gy. Higher radiation affects the material and may result in a significant decrease in mechanical properties. UV-Resistance When subjected to UV radiation, plain bearings become discolored. However, hardness, compressive strength and the wear resistance of the material are not effected. Vacuum In vacuum applications, any absorbed moisture content is outgassed. For this reason only dehumidified bearings are suitable for use in a vacuum. Electrical Properties plain bearings are electrically insulating. Specific volume resistance Surface resistance > Ωcm > Ω Electrical properties of 304 Lifetime calculation, configuration and more

7 - Product Range Sleeve bearing - Metric 30 d2 Order key Type Dimensions S M Dimensions according to ISO and special dimensions *Based on steel housing bore f b1 d1 0.5 mm 30 For tolerance values please refer to page 303 material Form S (sleeve) Metric Inner-Ø d1 (mm) Outer-Ø d2 (mm) Length b1 (mm) Part Number d1 d2 b1 I.D. fter Pressfit* Housing Bore Shaft Size h13 Min. Max. Min. Max. Min. Max. SM SM SM SM SM SM D-CD files, prices and delivery time 305

8 R - Product Range Flange bearing - Metric 30 d2 d1 Order key Type Dimensions F M f Dimensions according to ISO and special dimensions *Based on steel housing bore b1 b2 r d3 r = max. 0.5 For tolerance values please refer to page 303 material Form F (flange) Metric Inner-Ø d1 (mm) Outer-Ø d2 (mm) Length b1 (mm) Part Number d1 1) d2 d3 b1 b2 I.D. fter Pressfit* Housing Bore Shaft Size d13 h Min. Max.. Min. Max. Min. Max. FM FM FM FM FM FM Lifetime calculation, configuration and more