Special Issue; Products for Industrial Machinery - NTN

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NTN TECHNICAL REVIEW No.742006 Super-Wide Operating Angle (54˚) Fixed CVJ (TUJ) The world’s first fixed CVJ capable of a super-wide operating angle (max. = 54°) Results of a case study that assumes a 4˚ increase in the operating angle with a fixed joint on an ordinary medium-sized FF vehicle Approximately 70 cm (13%) decrease in the minimum turning radius of the vehicle (when the wheelbase is the same as a conventional CVJ) Approximately 40 cm (15%) increase in the wheelbase (when the minimum turning radius is the same as a conventional CVJ) Example of use Sliding constant velocity joint Features ¡Maximum operating angle (max): 54˚ (current UJ: 50˚) ¡Outer ring outside dia.: Same as with UJ ¡Mechanical strength, durability: Equivalent to those with UJ Applications Fixed constant velocity joint ¡Large-sized and medium-sized FF and 4WD vehicles boasting smaller minimum turning radius Front axle -118-
New Products Information Ultra-Low Torque Tapered Roller Bearing Significantly lower running torque (1/2 that of previous tapered roller bearing in the same class), without loss in bearing life and rigidity Features Performance ¡Realization of lower torque: 1/2 that of previous bearing ¡Compact bearing size: 10% or greater reduction of outside bearing diameter (same life and rigidity compared to previous bearing) Engineering challenges and solutions Challenge 1: Realization of lower torque Means for realization: Implementation of optimization in design Adoption of a new cage form with reduced oil stirring resistance Challenge 2: Maintain bearing life comparable to that of the previous bearing Means for realization: Adoption of FA heat treatment When lubricated with clean oil, the new product boasts a bearing life 2.8 times as long as that of the 4T product. Challenge 3: Maintain rigidity comparable to that of the previous bearing Means for realization: Adoption of a high load capacity design The cage is situated near the outer Previous product ring and a maximum possible number of rollers are incorporated. 27.25 27.25 Previous 30309D model 100 Oil flow 90 45 New product Image of oil flow New product Shape of cage pocket Running torque (Nm) Axial displacement (m) 1.2 1 0.8 0.6 0.4 0.2 0 0 Torque measurement result Bearing speed (r/min) Running torque is 1/2 as low as the previous product at a practical speed range of 500–2000 r/min. 40 35 30 25 20 15 10 5 0 500 1000 1500 2000 Bearing rigidity calculation result 0 5 10 15 20 25 30 Axial load (kN) Previous product New product Previous product New product The new product has rigidity nearly equivalent to that of the previous product -119-
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88th Anniversary Special Issue; Pro
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R No.74 TECHNICAL REVIEW Special Is
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NTN TECHNICAL REVIEW No.742006 Pref
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Trends in Recent Machine Tool Techn
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Development of a New Grease Lubrica
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High-Speed Tapered Roller Bearing f
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Minimum Quantity and Cooling Jet Lu
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Minimum Quantity and Cooling Jet Lu
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dmn17010 4 Sealed High-speed Angula
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Development of Aerostatic Bearing S
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Development of Aerostatic Bearing S
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Introduction of New Products for Ma
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Atmospheric Control Method for JIS-
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The Influence of Hydrogen on Tensio
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Technical Trends in Bearings for Of
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Technical Trends in Bearings for Of
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Page 73 and 74: Unit Products for Office Equipment
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Page 79 and 80: Honing Sludge and Electro Furnace D
Page 85 and 86: Ultra-Clean Bearing for Clean Envir
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Page 89 and 90: Development of New RCT Bearing for
Page 95 and 96: High Load Capacity Cylindrical Roll
Page 101 and 102: The Rust Guard Bearings of Highly C
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Page 105 and 106: “SSB” of Sliding Aseismic Isolu
Page 107 and 108: “SSB” of Sliding Aseismic Isolu
Page 109 and 110: Monodrive Two-Way Feeder Flow direc
Page 111 and 112: Monodrive Two-Way Feeder MD20: 17.5
Page 113 and 114: "Hybrid Bearphite" a Sintered Metal
Page 121: New Products Information PTJ High-A
Page 125 and 126: New Products Information Hub Bearin
Page 127 and 128: New Products Information Low-Emissi
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Page 131: NTN TECHNICAL REVIEW No.74 Printed
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