Roller Bearing introduction
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1. The document discusses rolling bearings, including their types, parameters that control bearing manufacturing and selection, bearing part numbering systems from major manufacturers like SKF, and factors that affect bearing life. 2. It defines basic static load rating, basic dynamic load rating, and basic rating life of bearings, and provides a formula to calculate catalog load rating based on desired life, speed, and load. 3. An example problem demonstrates using the rating life formula to determine the catalog load rating from SKF for a given desired life, speed, and
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叩c thnh ph畉n c畛a v嘆ng bi JNS 動畛c lm t畛 c叩c lo畉i v畉t li畛u cao c畉p, 叩p 畛ng nh畛ng ti棚u chu畉n k畛 thu畉t cao nh畉t 畛 mang l畉i hi畛u su畉t t畛i 動u:
Th辿p h畛p kim cao c畉p: V嘆ng ngoi v v嘆ng trong c畛a v嘆ng bi JNS th動畛ng 動畛c lm t畛 th辿p h畛p kim ch畛a hm l動畛ng carbon cao, gi炭p gia tng 畛 c畛ng v kh畉 nng ch畛u l畛c, ch畛ng l畉i c叩c t叩c 畛ng c董 h畛c.
V畉t li畛u ch畛ng n m嘆n: V畛i m畛t s畛 v嘆ng bi 畉c bi畛t s畛 d畛ng trong m担i tr動畛ng 畉m ho畉c c坦 h坦a ch畉t, JNS s畛 d畛ng th辿p kh担ng g畛 ho畉c v畉t li畛u ch畛ng n m嘆n 畛 畉m b畉o v嘆ng bi kh担ng b畛 g畛 s辿t, k辿o di tu畛i th畛 v 畛 tin c畉y.
V畉t li畛u b担i tr董n 畉c bi畛t: V嘆ng bi JNS th動畛ng 動畛c b担i tr董n b畉ng d畉u ho畉c m畛 ch畛u nhi畛t c坦 ch畉t l動畛ng cao, gi炭p gi畉m ma s叩t, ch畛ng mi m嘆n v b畉o v畛 v嘆ng bi trong i畛u ki畛n nhi畛t 畛 cao.
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Roller Bearing introduction
- 1. For Consulting & Engineering Services
- 2. Introduction & Bearing Rating Life of: Instructor: M o h a m e d H a s s a n D a d o u r a
- 3. INTRODUCTION
- 5. Rolling Bearing is a machine element used to reduce friction of rotating or movable parts. It transmit motion through roller element by: 1- Point contact 2- Line contact
- 6. How to read Bearing Part Number of SKF
- 7. The most famous bearing manufacturers around the world are: TIMKN , SKF , NTN , NTJ , NSK , FAG
- 9. Parameters control Bearing Manufacturing and Selection 1- Load 2- Velocity 3- Temperature Loads: Bearing designed to receive: 1- Pure radial load: ( i.e. Ball Roller Bearing ) 2- Pure axial load: ( i.e. Ball Roller Thrust Bearing ) 3- Combined load: ( i.e. Tapered Roller Bearing ) 1 2 3
- 10. Parameters Control Bearing Selection 1- Load 2- Velocity 3- Temperature Velocity: Bearing roller type selected according to: 1- Velocity with light loads: ( i.e. Needle Roller Bearing) 2- Velocity with heavy loads: ( i.e. Spherical Roller Bearing ) To Calculate shaft speed: V (m/s) = (rad/s) r(m) = 2 r (m) n (rpm) / 60 1 2
- 11. Parameters Control Bearing Selection 1- Load 2- Velocity 3- Temperature Temperature: Is a one of criteria control the material selection of bearing material and its geometrical clearance in design, where in high temperature working area lubricant life will be short, also material will be expanded so bearing must have facilities to face this so some special bearing material is produced for furnace conveyors. Temperature defined in part number by letter C0 or CN it take numbers from C1 to C5 which constrain the type of lubricant and working temperature.
- 12. *Table 4 NSK Bearing Designation System.
- 13. Standard radial clearance chart for deep groove ball bearings
- 14. Bearing Radial Clearance Selection According to Application
- 15. Lubrication Contamination Deformation Misalignment Radial load Axial load Speed Temperature Improperly mounting the bearings Main Factors Affecting Bearing Life
- 16. Bearing Load Life at Rated Reliability
- 17. Bearing Basic Loads & Rating Life 1- Basic Static Load: (C0) The Bearing Static Capacity Co, is the radial load which a non-rotating ball bearing will support without damage, and will continue to provide satisfactory performance and life. The static radial load rating is dependent on the maximum contact stress between the balls and either of the two raceways. 2- Basic Dynamic Load: (C10) Defined as the calculated, constant radial load that a group of apparently identical bearings will theoretically endure for a rating life of one million revolutions. A bearing should only be subject to a maximum operating load equal to half its Bearing dynamic capacity. The load that will give a life of 106 revolutions of the inner race. 3- Basic Rating Life): (L10) Rating life is the bearing life calculated for 90% reliability. This is the amount of time that a group of apparently identical bearings will complete or exceed before the formation of a fatigue spall.
- 18. Rating Life Formula: C10 (LR nR 60)1/a = FD (LD nD 60)1/a Note: C10 x L10 = FD x LD , where L = (L x n x 60) where L represent cycles or rev/sec and L10 = 106 cycles according to Standard of Roller bearing fatigue test. 666 a = 3 for ball bearings a = 10/3 for roller bearings LD = desired life ( hours ) nD = desired speed ( rpm ) FD = desired load ( kN )66 LR = rating life ( hours ) nR = rating speed ( rpm ) C10 = Catalog rating ( kN )
- 19. Consider SKF, which rates its bearings for 1 million revolutions. If you desire a life of 5000 h at 1725 rev/min with a load of 1780 N with a reliability of 90 percent, for which catalog rating would you search in SKF catalog? Example1 Solutions: 10 (LR nR 60)1/a = FD (LD nD 60)1/a G i v e n : LD = 5000 hour nD = 1725 rpm FD = 1.78 kN L10 = 106 cycles C10 = ? Take a = 3 ,when type of bearing not mentioned consider it ball bearing. 10 (106)1/3 = 1.78 (5000 x 1725 x 60)1/3 10 = 1.78 x ( 517500000 / 106 )1/3 10 = 14.3 kN
- 20. M. H. Dadoura