Super Long-life Needle Roller - Roller Bearings
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Life, stress cycles 99.9 99 95 90 50 10 5 1 10 6 10 7 10 8 Percent failed, % Conventional Roller Super Long-life Roller Super Long-life Needle Roller Development Objectives General Description and Product Features (Structure and Operating Principles) Features of the NSK-developed Roller Ref: TI-A/E/0005 TECHNICAL INSIGHT · A publication of NSK Europe · www.nskeurope.com Efficiency improvement of transmission › Compact, lightweight › Oil friction loss reduction › Improved durability › Sustains a lubrication film 10 mm 10 mm I. The topmost surface is specially treated, thereby increasing surface hardness II. Oil sump is formed on the surface layer, thereby enhancing the oil film retention performance between the two surfaces in contact Standard High hardness Conventional Roller Super Long-life Roller External View Surface Hardness Enlarged Shape of Surface Layer Life Endurance Test Result of a Needle Roller Test Conditions Bearing tested: Thrust needle roller bearing Load condition: Standard Lubrication: Low-viscosity oil Lubrication condition: Lean lubrication Wear Endurance Test Result of a Planetary Shaft Test Conditions Bearing tested: Planetary needle roller bearing Load condition: Heavy load Lubrication: Low-viscosity oil Lubrication condition: Lean lubrication Shaft: Special heat treatment (SUJ2) Planetary Shaft (after test) Suppress wear of the shaft (counterpart component) Life endurance performance was improved by more than double Use of Conventional Roller Use of Super Long-life Roller Generation of step wear No wear 10 µm 2 mm
Transcript of Super Long-life Needle Roller - Roller Bearings
Life, stress cycles
99.9999590
50
10
5
1106 107 108
Perc
ent f
aile
d, %
Conventional Roller
Super Long-life Roller
Super Long-life Needle RollerDevelopment Objectives
General Description and Product Features (Structure and Operating Principles)
Features of the NSK-developed Roller
Ref: TI-A/E/0005TECHNICAL INSIGHT · A publication of NSK Europe · www.nskeurope.com
Efficiency improvement of transmission
› Compact, lightweight› Oil friction loss reduction
› Improved durability› Sustains a lubrication film
10 mm
10 mm
I. The topmost surface is specially treated, thereby increasing surface hardness
II. Oil sump is formed on the surface layer, thereby enhancing the oil film retention performance between the two surfaces in contact
Standard
High hardness
Conventional Roller
Super Long-life Roller
External View Surface Hardness Enlarged Shape of Surface Layer
Life Endurance Test Result of a Needle Roller
Test ConditionsBearing tested: Thrust needle roller bearingLoad condition: StandardLubrication: Low-viscosity oilLubrication condition: Lean lubrication
Wear Endurance Test Result of a Planetary Shaft
Test ConditionsBearing tested: Planetary needle roller bearingLoad condition: Heavy loadLubrication: Low-viscosity oilLubrication condition: Lean lubricationShaft: Special heat treatment (SUJ2)
Planetary Shaft (after test)
Suppress wear of the shaft (counterpart component)Life endurance performance was improved by more than double
Use of Conventional Roller
Use of Super Long-life Roller
Generation of step wear
No wear 10 µm2 mm
