Copyright KOYO 1997The contents of this catalogue are the copyright of KOYO andmay not be reproduced unless permission is granted.Cares have been taken in every aspect to ensure the correctnessof the data contained in this catalogue but no liability can be accepted for any mistakes or omissions. >

1.Structures and types2.Internal clearance 3.Bearing numbers 4.Handling of bearings > Deep groove ball bearings d 3 200 mm Angular contact ball bearings d 10 ֖ 200 mm Self-aligning ball bearings d 10 100 mm Cylindrical roller bearings d 20 ֖ 200 mm Tapered roller bearings d 15 200 mm Spherical roller bearings d 25 ֖ 300 mm Thrust ball bearings d 10 200 mm Spherical thrust roller bearings d 60 ֖ 300 mm Ball bearing units d 10 140 mm Locknuts and lockwashers >

Standard ball and roller bearings a Ball bearing units Locknuts a Lockwashers >

BallCylindrical roller ( L > 1) w ≤ 3 D > w ) Long cylindrical roller(3 D > 1) w < L > w <10 D > w , D > w >5 mm) Needle roller(3 D > 1) w < L > w <10 D > w , D > w ≤ 5 mm) Tapered roller (tapered trapezoid)Convex roller (barrel shape) > D > w :roller diameter(mm)Note 1) > CupRollerConeCage Outer ringBallInner ringCage Deep groove ball bearingTapered roller bearing Thrust ball bearing Shaft washerBallHousing washer Cage α = 0˚ α α = 90˚ Note) In thrust bearings inner and outer rings and also called"shaft washer" and "housing washer" respectively; in tapered roller bearings, the respective forms...

29200 29300 29400 This type of bearing, comprising barrel-shapedconvex rollers arranged at an angle with the axis, is self-aligning due to spherical housing washer raceway;therefore, shaft inclination can be com- pensated for to a certain degree. Great axial load resistance is provided.This type can accommodate a small amount of radial load as well as heavy axial load. Normally, oil lubrication is employed.[ Recommended cage ]Copper alloy machined cage[ Main applications ]Hydroelectric generators, vertical motors, propeller shafts for ships, screw down speed reducers, jib cranes, coal mills,...

2) Inspection of shafts and housings > Clean up the shaft and housing to checkwhether it has flaws or burrs as a result of machining.Be very careful to completely remove lap-ping agents (SiC, Al > Since rolling bearings are more preciselymade than other machine parts, careful handling is absolutely necessary. 1) Keep bearings and the operating environ-ment clean.2) Handle carefully.Bearings can be cracked and brinelled easily by strong impact if handled roughly.3) Handle using the proper tools. 4) Keep bearings well protected from rust.Do not handle bearings in high humidity. Operators should...

Mounting methods Descriptions > q Locknut w Hydraulic nut (a) Mounting on tapered shafts > q Locknut w Hydraulic nut(b) Mounting by use of an adapter Special spanner > q Locknut w Hydraulic nut(c) Mounting by use of a withdrawal sleeve (d) Measuring clearances Locating bearing by use of a clamp >

Inner ring dismounting methods Descriptions > Fixtures Removal jaws > (a) Dismounting byuse of a press (b) Dismounting by useof special tools(c) Dismounting by useof special tools (d) Dismounting usinginduction heater >

Inner ring dismounting methods Descriptions > (a) Dismounting by useof a wedge (b) Dismounting by useof oil pressure (e) Dismounting by useof locknuts(f) Dismounting by useof bolts(g) Dismounting by useof hydraulic nuts (c) Dismounting by useof clamps(d) Dismounting by useof hydraulic nuts > Outer ring dismounting methods Description > (a) Notches for dismounting(b) Bolt holes and boltsfor dismounting >

4-6-1 Cleaning Periodic and thorough maintenance andinspection are indispensable to drawing full performance from bearings and lengthening their useful life.Besides, prevention of accidents and downtime by early detection of failures through maintenance and inspection greatly con- tributes to the enhancement of productivity and profitability. Before dismounting a bearing for inspec-tion, record the physical condition of the bearing, including taking photographs.Cleaning should be done after checkingthe amount of remaining lubricant and col- lecting lubricant as a sample for examina- tion.? A...

OpentypeShieldedtypeSealedtype Bore diameter 10 200 mm > With snap ring grooveWith locating snap ring Bore diameter 10 ֖ 130 mm > ( with fillin g slot ) Bore diameter 15 ֖ 75 mm >

Contact angle

BB > 1 1 rrr r > 1 rr ָDdr D踸dr With machined cageWith pressed cage Boundary dimensions Basic load ratings (kN) Limiting speeds (Refer.) 290462.11.1217268֖2 3002 800290462.11.1194241֖1 7002 3003405541.5273353֖1 5002 0004007852411548֖1 3001 800 3605841.5292384֖1 4001 9004208052432602֖1 2001 70010.810.818.845.5 22.452.0 (mm) With machined cageWith pressed cage (min > 1 ) Bearing > 1) Mass > 0r (kg) 190200 70387038B7238B7338B 7240B7340B Note1) B, C or no indication after the bearing number indicates nominal contact angle of 40֋, 15ڋ and 30ڋ respectively.Remark) Standard cage types used for the above...

Cylindrical roller bearings Cylindrical roller bearings feature high radial loadcapacity because the rollers and raceway are in linear contact.These bearings are suitable for applications that involve heavy radial and impact loading.They are also appropriate for high-speed applicationsin that they can be machined very accurately due to their structure.Having a separable inner ring or outer ring, thesebearings can be mounted and dismounted easily. > Bore diameter 20 200 mm Cylindrical roller bearings > NUNNJNFNUP ? The NU and N types exhibit their best performancewhen used as free side bearings...

Bearing seriesPressed cageMachined cage NU 101005 ֖ 1092NU, NJ, NUP, NF 2204 220204 ֖ 264NU, NJ, NUP 222204 22202204 ֖ 2252NU, NJ, NUP, NF 3304 320304 ֖ 348NU, NJ, NUP 232304 23202304 ֖ 2340NU, NJ, NUP, NF 4406 420406 ֖ 430 >

Cylindrical boreTapered bore > StructureRollerConvex asymmetrical rollerCageCopper alloy prong typemachined cage *(excl.240 and 241 series)Inner ring (with or without rib)With center ribCharacteristicsSuperior to RH and RHA typesin high-speed performance.With ribs on both sides (to prevent rollers from falling) *(excl.240 and 241 series) R, RR type* RH, RHR type RHA type Convex symmetrical rollerPressed steel cage Without center rib (guide ring)The load rating capacity is larger than that of R type.(There aresome exceptional cases due to different interior specifications.)Without ribs on both...