NTN - Precision Rolling Bearings

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NTN Main Spindle Bearings !7 Grease-lubricated sealed standard angular contact ball bearings 79LLB and 70LLB, 5S-79LLB and 5S-70LLB types The 79LLB and 70LLB types are grease-lubricated, eco-friendly bearings that can achieve stable high-speed operation with limited temperature rise. They can allow, longer service life and preservation of healthy working environment for rotating tools with shaft diameters less than 50 mm. Features 1. Internal design is optimized for high-speed operation and limited temperature rise. 2. Longer grease life due to adoption of special grease and non-contact seals for grease retention. 3. Contact angles of 15˚ and 25˚ are available. 4. The standard types meet special precision P42 requirements (dimensional precision JIS P4 and running accuracy JIS P2). 5. Seals of different colors are used for front (black) and back (orange) sides. Bearing configuration can be easily identified by color. 6. Available with either steel or ceramic balls. Bearing specifications Back Front Fig. 9.33 79LLB and 70LLB types Simplified main spindle configuration Due to the optimized internal structure, the 79LLB and 70LLB types can reliably run at a higher speed with grease lubrication. The grease lubricating system is virtually free from oil mist emission, and contributes to a simpler main spindle structure, reduction in environmental impact and decrease in cost. (Fig. 9.34) Air-oil lubrication Grease lubrication Simplifies the main spindle structure, and reduces the initial and operation costs. Fig. 9.34 Modification of lubrication system (air-oil lubrication to grease lubrication) Easier handling with 79LLB and 70LLB types The 79LLB and 70LLB types are prefilled with grease. They can be readily used after only wiping away rust preventive oil. Seals of different colors are used for the front and back sides of the bearing. Black seals are used for the front sides and orange seals are used for the back sides, so configurations are readily identified by colors. (Table 9.21) Table 9.21 Bearing Combinations and Seal Colors DB set (back faces in combination) DF set (front faces in combination) Orange seal Orange seal Black seal Black seal 78
NTN Main Spindle Bearings Permissible speed range dmn value 10 6 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 70 LLB 25˚ 15˚ 79 LLB 25˚ 15˚ 5S-70 LLB 25˚ 15˚ 5S-79 LLB 25˚ 15˚ Notes) Permissible speed of each bearing (dmn value) varies depending on the specifications of the machine on which the bearing is used (motor drive system, cooling system, and construction around the bearing). Consider the optimal choice referring to the above guideline (for two-row arrangement) and contact NTN Engineering for technical assistance. High-speed test Optimization of the internal design promotes stable operation of dmn value 1.110 6 . (Figs.9.35 and 9.36) Temperature rise of outer ring ˚C 35 30 25 20 15 10 5 0 7006CDw/o jacket cooling 7006CDw/ jacket cooling 7006ADw/o jacket cooling 7006ADw/ jacket cooling 0 5000 10000 15000 20000 25000 Speedmin -1 Tested bearing Shaft speed Pre-load after assembled 7006CDLLBDBP42 7006ADLLBDBP42 (3055132 rows) 025000 min -1 180 N5S-7006CDLLB 250 N5S-7006ADLLB 0 0.25 0.5 0.75 1.0 dmn value 10 6 Fig. 9.35 High-speed test results (7006CD, contact angle 15˚) (7006AD, contact angle 25˚) Temperature rise of outer ring ˚C 35 30 25 20 15 10 5 0 5S-7006CDw/o jacket cooling 5S-7006CDw/ jacket cooling 5S-7006ADw/o jacket cooling 5S-7006ADw/ jacket cooling 0 5000 10000 15000 20000 25000 Speedmin -1 0 0.5 1.0 dmn value 10 6 Test conditions Tested bearing Shaft speed Pre-load after assembled 5S-7006CDLLBDBP42 5S-7006ADLLBDBP42 (3055132 rows) 025000 min -1 180 N5S-7006CDLLB 250 N5S-7006ADLLB Fig. 9.36 High-speed test results (5S-7006CD, contact angle 15˚) (5S-7006AD, contact angle 25˚) 79
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R Precision Rolling Bearings %
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1. Classification of Precision Roll
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Precision Rolling Bearings Page TEC
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Technical Data Bearing type Cross s
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Technical Data 2. Bearing Selection
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Technical Data 2 Bearing accuracy B
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Technical Data N.R.R.O. (Non-Repeti
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Technical Data 3 Bearings and rigid
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Technical Data Gyratory sliding Ev
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Technical Data Abutment height and
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Technical Data where, L m : Total l
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Technical Data NTNs new bearing lif
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Technical Data Table 3.3 Minimum sa
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Technical Data Bearing arrangement
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Technical Data 3 Adjustable preload
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Page 49 and 50: Technical Data 7805C7834CT17928CT1B
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Page 53 and 54: Technical Data Life under high temp
Page 55 and 56: Technical Data Grease-lubricated s
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NTN Main Spindle Bearings 3 Bearing
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NTN Main Spindle Bearings Perpendic
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Main Spindle Bearings !5 Dimension
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NTN Main Spindle Bearings 2 Standar
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NTN Main Spindle Bearings 5 Accurac
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NTN Main Spindle Bearings 7 Shaft a
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NTN Main Spindle Bearings 3 Accurac
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Main Spindle Bearings Sa Sb r1a Dyn
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NTN Ball Screw Support Bearings Bal
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NTN Ball Screw Support Bearings Eas
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NTN Ball Screw Support Bearings (4)
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NTN Ball Screw Support Bearings 5 B
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NTN Ball Screw Support Bearings Fac
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NTN Ball Screw Support Bearings 7 S
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NTN Ball Screw Support Bearings !0
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Ball Screw Support Bearings When on
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Ball Screw Support Bearings When on
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Ball Screw Support Bearings Part nu
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Ball Screw Support Bearings B B 2B
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NTN Products 5 Radial internal clea
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NTN Products (Reference) Standard c
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NTN Products 4. High precision air
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301 Appendix Table 1: Boundary dime
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Appendix Table 2: Comparison of SI,
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Appendix h4 h5 h6 h7 h8 h9 h10 h11
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Appendix H7 H8 H9 H10 H11 H13 J6 Js
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Appendix Table 8: Viscosity convers
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311 Appendix 1/64 1/32 3/64 1/16 5/
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NTN - Precision Rolling Bearings

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