>> P.431
JCRBHVCRBFVCRB(C)CRBTCRBTFCRBS1N=0.102kgf=0.2248lbs.1mm=0.03937inch■Allowable rotational speedWhen using a special grease, carefully examine the grease properties and contents such as base oil vis-Allowable rotational speeds of Crossed Roller Bearings cosity and extreme pressure additives. In this case, are affected by mounting and operating conditions. The please contact IKO.values in general operation are shown in Table 14. For the allowable rotational speed for Lightweight Crossed Roller Bearings, see pages J29 to J30.Table 14 dmn values(1)of Crossed Roller BearingsTypeWith cage orwith separatorFull complementLubricantGreaseOilOpen type75 000150 000Sealed type 60 000-Open type50 00075 000Sealed type40 000-Note(1)・dmn value=dm×nwhere, dm : Mean value of bearing bore and outside diameters, mm n : Number of rotations per minute, min-1 ■Rotational torqueRotational torque of IKO Crossed Roller Bearings are lower than that of plain bearings and the difference between the static torque and the dynamic (kinetic) torque is small. Therefore, these bearings minimize power consumption and operating temperature rise of machinery and increase the overall efficiency of machines.The rotational torque is affected by many factors, but the following equations can be used expediently. DpwT =μP0r——— 2 where, T : Rotational torque,N・mmμ P0r : Static equivalent radial load,N: Friction coefficient (Approx. 0.010) Dpw : Pitch circle diameter,mm( ) d+DDpw ≒———— 2In addition, please contact IKO when the negative radi-al clearance is larger after mounting.Remarks he frictional torque is calculated differently for LCRB. Please contact IKO for details.■LubricationThese bearings are generally lubricated with grease. Grease is supplied through the clearance between the inner ring and the outer ring.Prepacked lubrication grease includes Shell Lubricants Japan Table 15 Bearings with prepacked grease○:With prepacked grease ×:Without prepacked greaseSeal specificationModel codeOpen typeSealed type(No symbol)(UU)One sidesealed type(U)CRBHV … ACRBFV … ACRBCCRBCRBT … ACRBTF … ACRBSCRBS … ACRBS … VLCRB××××〇〇×-×〇〇〇〇〇---〇〇---××---××-■Oil HoleFor Crossed Roller Bearings, oil holes and oil grooves can be provided on bearing rings if requested. However, this is not applicable to Super Slim Type Crossed Roller Bearings, Mounting Holed Type Super Slim Crossed Roller Bearings, or Lightweight Crossed Roller Bearings. When an oil hole is required on the outer ring, attach "-OH" before the clearance symbol in the identication number. When an oil hole and an oil groove are required on the outer ring, attach "-OG" at the same place in the identication number. For an oil hole on the inner ring, attach "/OH", and for an oil hole and an oil groove on the inner ring, attach "/OG", at the same place in the identification number. High Rigidity Type Crossed Roller Bearings V and Mounting Holed Type High Rigidity Type Crossed Roller Bearings V have an oil groove and two oil holes on the outer ring as standard. Table 16 shows availability of oil holes for each bearing type.Table 16 Oil holes Bearing typeCRBHV … ACRBFV … ACRBCCRBCRBT … ACRBTF … AOil hole code/nOH/nOG-nOH-nOG〇-〇〇--〇〇〇〇-〇〇-------〇〇--〇〇〇-(1)-(1)〇〇-----K.K. Shell Gadus S2 V125J 2 (S) for Lightweight Crossed Roller CRBSBearings and Shell Gadus S2 V220J 2 (EP) for the other Crossed Roller Bearings.CRBS … ACRBS … VFor bearings without prepacked grease, supply grease or oil for use. Notes(1) CRBHV … A and CRBFV … A are provided with an oil Operating without lubrication will increase the wear on the rolling groove and two oil holes on the outer ring.contact surfaces and greatly affect noise and heat generation, leading to a shorter bearing life. For the sealed type, be careful with pressure when applying grease so that the seals do not come off.Remark n denotes the number of oil holes not exceeding 4. For one oil hole, number is not indicated.When preparing multiple oil holes, please contact IKO.J12
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