NTN - Large Bearings

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Lubrication Table 6.3 Grease varieties and characteristics Grease name Lithium grease Sodium grease (fiber grease) Calcium compound base grease Thickener Li soap Na soap Ca+Na soap Ca+Li soap Base oil Mineral oil Diester oil Silicone oil Mineral oil Mineral oil Dropping point˚C 170 190 170 190 200 250 150 180 150 180 Operating temperature range˚C -30 +130 -50 +130 -50 +160 -20 +130 -20 +120 Mechanical stability Excellent Excellent Excellent Pressure resistance Excellent Water resistance Applications Widest range of applications. Grease used in all types of rolling bearings. Excellent low temperature and wear characteristics. Suitable for small sized and miniature bearings. Suitable for high and low temperatures. Unsuitable for heavy load applications due to low oil film strength. Some emulsification when water is introduced. Excellent characteristics at relatively high temperatures. Excellent pressure resistance and mechanical stability. Suitable for bearings receiving shock loads. Grease name Aluminum grease Non-soap base grease Thickener Thickener AI soap Bentone, silica gel, urea, carbon black, fluorine compounds, etc. Base oil Mineral oil Mineral oil Synthetic oil Dropping point ˚C 70 90 250 or above 250 or above Operating temperature range˚C -10 +80 -10 +130 -50 +200 Mechanical stability Pressure resistance Water resistance Applications Excellent viscosity characteristics. Suitable for bearings subjected to vibrations. Can be used in a wide range of low to high temperatures. Shows excellent heat resistance, cold resistance, chemical resistance, and other characteristics when matched with a suitable base oil and thickener. Grease used in all types of rolling bearings. A-39
Lubrication 6.3.2 Base oil Natural mineral oil or synthetic oils such as diester oil, silicone oil and fluorocarbon oil are used as grease base oils. Table 6.4 Consistency of grease NLGI Consistency No. JIS (ASTM) Worked penetration Applications Mainly, the properties of any grease are determined by the properties of the base oil. Generally, greases with a low viscosity base oil are best suited for low temperatures and high speeds; while greases made from high viscosity base oils are best suited for heavy loads. 6.3.3 Thickening agents Thickening agents are compounded with base oils to maintain the semi-solid state of the grease. Thickening agents consist of two types of bases, metallic soaps and non-soaps. Metallic soap thickeners include: lithium, sodium, calcium, etc. Non-soap base thickeners are divided into two groups; inorganic (silica gel, bentonite, etc.) and organic (polyurea, fluorocarbon, etc.). The various special characteristics of a grease, such as limiting temperature range, mechanical stability, water resistance, etc. depend largely on the type of thickening agent used. For example, a sodium based grease is generally poor in water resistance properties, while greases with bentone, poly-urea and other non-metallic soaps as the thickening agent are generally superior in high temperature properties. 6.3.4 Additives Various additives are added to greases to improve various properties and efficiency. For example, there are anti-oxidants, high-pressure additives (EP additives), rust preventives, and anti-corrosives. For bearings subject to heavy loads and/or shock loads, a grease containing high-pressure additives should be used. For comparatively high operating temperatures or in applications where the grease cannot be replenished for long periods, a grease with an oxidation stabilizer is best to use. 6.3.5 Consistency The consistency of a grease, i.e. the stiffness and liquidity, is expressed by a numerical index. The NLGI values for this index indicate the relative softness of the grease; the larger the number, the stiffer the grease. The consistency of a grease is determined by the amount of thickening agent used and the viscosity of the base oil. For the lubrication of rolling bearings, greases with the NLGI consistency numbers of 1, 2, and 3 are used. General relationships between consistency and application of grease are shown in Table 6.4. 0 1 2 3 4 355385 310340 265295 220250 6.3.6 Mixing of greases When greases of different kinds are mixed together, the consistency of the greases will change (usually softer), the operating temperature range will be lowered, and other changes in characteristics will occur. As a general rule, greases with different bases oil, and greases with different thickener agents should never be mixed. Also, greases of different brands should not be mixed because of the different additives they contain. However, if different greases must be mixed, at least greases with the same base oil and thickening agent should be selected. But even when greases of the same base oil and thickening agent are mixed, the quality of the grease may still change due to the difference in additives. For this reason, changes in consistency and other qualities should be checked before being applied. 6.3.7 Amount of grease The amount of grease used in any given situation will depend on many factors relating to the size and shape of the housing, space limitations, bearing's rotating speed and type of grease used. As a general rule, housings and bearings should be only filled from 30% to 60% of their capacities. Table 6.5 <strong>Bearings</strong> space ratio K Bearing typeRetainer typeK 1 Ball bearings Pressed retainer 61 NU-type cylindrical roller bearings 2 3 N-type cylindrical roller bearings Tapered roller bearings Spherical roller bearings 1 Remove 160 series 2 Remove NU4 series 3 Remove N4 series For centralized greasing use For centralized greasing use For general use and sealed bearing use For general and high temperature use 175205 For special use Pressed retainer Machined retainer Pressed retainer Machined retainer Pressed retainer Pressed retainer Machined retainer 50 36 55 37 46 35 28 A-40
Page 1 and 2: For New Technology Network R corpor
Page 3 and 4: Warranty NTN warrants, to the origi
Page 5 and 6: A-2
Page 7 and 8: A-4
Page 9 and 10: Load Rating and Life n min -1 60,00
Page 11 and 12: Bearing Load Calculation 2. Bearing
Page 13 and 14: A-10A-30
Page 15 and 16: Bearing Tolerances Table 3.3 Tolera
Page 23 and 24: Bearing Tolerances 3.2 Limits and t
Page 25 and 26: Bearing Fits 4. Bearing Fits 4.1 In
Page 27 and 28: Bearing Fits (3) Consideration must
Page 29 and 30: Bearing Fits Table 4.3 Standard fit
Page 31 and 32: Bearing Fits Table 4.6 Fits for inc
Page 33 and 34: Bearing Internal Clearance (1) Redu
Page 35 and 36: Bearing Internal Clearance Table 5.
Page 41: Lubrication 6. Lubrication 6.1 Lubr
Page 45 and 46: Lubrication 6.5 Oil lubrication Oil
Page 47 and 48: Lubrication Table 6.9 Factor K Expe
Page 49 and 50: MEMO A-46
Page 51 and 52: INDEX OF BEARING TABLES Deep Groove
Page 53 and 54: Deep Groove Ball Bearings
Page 55 and 56: Deep Groove Ball Bearings D r B r d
Page 61 and 62: Deep Groove Ball Bearings r D B r d
Page 63 and 64: Angular Contact Ball Bearings
Page 65 and 66: Angular Contact Ball Bearings 1. 2
Page 67 and 68: Angular Contact Ball Bearings Singl
Page 81 and 82: Double Row Angular Contact Ball Bea
Page 83 and 84: Double Row Angular Contact Ball Bea
Page 85 and 86: Cylindrical Roller Bearings
Page 87 and 88: Cylindrical Roller Bearings Table 3
Page 89 and 90: Single Row Cylindrical Roller Beari
Page 91 and 92: Single Row Cylindrical Roller Beari
Page 93 and 94:
Single Row Cylindrical Roller Beari
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Multi-Row Cylindrical Roller Bearin
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4-Row Cylindrical Roller Bearings C
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SL Type Cylindrical Roller Bearings
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Tapered Roller bearings
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Tapered Roller Bearings Table 2 Str
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Tapered Roller Bearings Inch system
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Tapered Roller Bearings Inch system
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Single Row Tapered Roller Bearings
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Double Row Tapered Roller Bearings
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Double Row Steep Slope Tapered Roll
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Four Row Tapered Roller Bearings C2
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Sealed Four Row Tapered Roller Bear
Page 251 and 252:
Spherical Roller bearings
Page 253 and 254:
Spherical Roller Bearings 2. Dimens
Page 255 and 256:
Spherical Roller Bearings B r r D d
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Thrust bearings
Page 277 and 278:
Thrust Bearings 1. 3 Tapered roller
Page 279 and 280:
Thrust Bearings d1 d D1 D r r T da
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Thrust Bearings d1 d D1 D r r T da
Page 283 and 284:
Thrust Roller Bearings r d1 d D D1
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Thrust Roller Bearings r d1 d T r D
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Thrust Roller Bearings r d1 d T r D
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Tapered Roller Thrust Bearings (Sin
Page 291 and 292:
Tapered Roller Thrust Bearings (Sin
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Tapered Roller Thrust Bearings (Dou
Page 295 and 296:
Self-Aligning Thrust Roller Bearing
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Bearings for special applications C
Page 303 and 304:
Split Cylindrical Roller Bearings:
Page 305 and 306:
Double-Fractured Split Cylindrical
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Bearings for Preparing Rolls: Sendz
Page 309 and 310:
Enclosed-Type Tapered Roller Bearin
Page 311 and 312:
Tapered Roller Thrust Bearings: Scr
Page 313 and 314:
Tapered Roller Thrust Bearings: Scr
Page 315 and 316:
Tension Leveler Roll Unit: Cartridg
Page 317 and 318:
Turn Table Bearings: 3-Row Cylindri
Page 319 and 320:
Sealed Spherical Roller Bearings: M
Page 321 and 322:
Spherical Surface Slide Bearings ¡
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Catalog List & Appendix Table
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Catalog List CATALOG TITLES CATALOG
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Appendix Table D-5 Appendix table 1
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Appendix Table Appendix table 2: Co
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Appendix Table h4 h5 h6 h7 h8 h9 h1
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Appendix Table H7 H8 H9 H10 H11 H13
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Appendix Table Appendix table 8: Vi
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D-15 1/64 1/32 3/64 1/16 5/64 3/32
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NTN - Large Bearings

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