Identification Number

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4 Identification umber The identification number of Crossed Roller Bearings consists of a model code,, any supplemental codes and classification symbols as shown below. Supplemental code- (Seal specification) o symbol Open type UU Two sides sealed type For applicable codes, see Table. U One side sealed type UD One side sealed in the opposite direction to counter bored mounting holes on outer ring Example of identification number Example- CRBF A D UU C P Table Seal specification for Crossed Roller Bearing Mode code o symbol UU U UD Example- CRBH A UU C P CRBF A CRBH A Example- CRBC UU C P CRBC CRB Example- A UU C A V Model code Bore of bearing Width of bearing Supplemental code- Supplemental code- Supplemental code- (Internal Clearance) T T clearance C C clearance C C clearance o symbol ormal clearance Model code T C C CRBF A o symbol For applicable codes, see Table. Table Clearance specifications for Crossed Roller Bearing Supplemental code- ification symbol CRBH A CRBC CRB A Model code CRBF A CRBH A CRBC CRB A V Mounting Holed Type High Rigidity Crossed Roller Bearing (With separator) High Rigidity Crossed Roller Bearing (With separator) Standard Crossed Roller Bearing (With cage) Standard Crossed Roller Bearing (Full complement) Slim Type Crossed Roller Bearing (With cage) Slim Type Crossed Roller Bearing (With separator) Slim Type Crossed Roller Bearing (Full complement) ification symbol V o symbol Accuracy class P Accuracy class P Accuracy class P Accuracy class P Accuracy class For applicable symbols, see Table. Bore of bearing Width of bearing Supplemental code- (Mounting holes) Bore of bearing (unit: ) Width of bearing (unit: ) T With female threaded mounting holes on the inner ring o symbol With counter-bored mounting holes on both inner ring and outer ring in the same direction. D With counter-bored mounting holes on both inner ring and outer ring in the opposite direction. Remark: Applicable to High Rigidity Crossed Roller Bearing only. Table Accuracy of Crossed Roller Bearing Model code CRBF A CRBH A CRBC CRB A V o symbol P P P P =.f=.lbs. =.9inch

5 Load Rating and Life Basic dynamic The basic dynamic is defined as a constant radial load both in direction and magnitude under which a group of identical bearings are individually operated and 9% of the bearings in the group can rotate million revolutions free from material damage due to rolling contact fatigue. Life The basic rating life of Crossed Roller Bearings is obtained from the following formula. C L P r where, L Basic rating life, rev. C Basic dynamic, P r Dynamic equivalent radial load, If the number of revolutions per minute is known, the rating life in hours can be obtained from the following formula. L h / L n where, L h Basic rating life in hours, h n umber of revolutions per minute, Life in oscillating motion C rpm When a bearing is used in oscillating motion, the life can be obtained from the following formula. 9 C L c P r / where, L c Basic rating life in oscillating motion, cycle Oscillating angle, degrees (Refer to Fig..) P r Dynamic equivalent radial load, If the number of oscillations per minute n cpm is given, the rating life in hours can be obtained from Formula () by substituting n for n. When the oscillating angle is very small, oil film may not be formed between the rolling elements and the raceways, and fretting corrosion may occur. In this case, please consult. Fig. Oscillating motion Limitations of life formulae The above life formulae are applicable when the mounting and lubrication of bearing are normal and the bearing is used without intrusion of foreign matters under a normal operating condition and not under extreme severe condition. If these conditions are not satisfied, the actual life may decrease rapidly. For example, it is necessary to consider the additional factors, such as deformation of bearing by miss-mounting, large deformation of housing/shaft, large preload and use of unsuitable grease. Furthermore, when the dynamic equivalent radial load exceeds / of the basic dynamic, the life calculation formulae may not be used. Dynamic equivalent radial load The dynamic equivalent radial load of Crossed Roller Bearings can be obtained from the following formula. M P r X F r YF D a pw where, P r Dynamic equivalent radial load, F r Radial load, F a Axial load, M Moment, d D D pw Pitch circle, D pw X Radial load factor (Refer to Table.) Y Axial load factor (Refer to Table.) Fig. Load direction Table Radial load factor and axial load factor Conditions F a. F r M/D pw. F a. F r M/D pw.. X Y Basic static C Basic static is defined as a static load which gives a prescribed contact stress at the center of contact area between rolling elements and raceways on which the maximum load is applied. Static safety factor The static safety factor, f s, of Crossed Roller Bearings can be obtained from the following formula, and general values of this factor are shown in Table. C f s P r where, f s Static safety factor C Basic static, P r Static equivalent radial load (maximum load), Table Static safety factors Operating conditions When high rotational accuracy is required. ormal operation When smooth rotation is not important under normal operation. Rotation without vibration. When bearing rotation is very little or none Static equivalent radial load The static equivalent radial load of Crossed Roller Bearings can be obtained from the following formula. M P r F r.f D a pw where, P r Static equivalent radial load, F r Radial load, F a Axial load, M Moment, D pw Pitch circle, Load factor Actual loads applied to the Crossed Roller Bearing sometimes exceed the theoretically calculated load due to the vibration and shocks caused by machine operation. The life is calculated from the following formula while considering the load factor shown in Table. Ff w F c where, F Load for life calculation, f w Load factor (See Table ) F c Theoretical calculated load, Table Load factor condition Smooth operation free from vibration and/or shocks ormal operation f s. d D D pw f w... Life calculation example Bearing CRBHA Bore d Outside D Basic dynamic C Basic static C W W F r L Calculate the life and the static safety factor under the above conditions. Radial load F r Axial load Moment F a W W MW L d D Pitch circle D pw F a F.. r M/D pw / Therefore X, Y. The theoretically calculated dynamic equivalent radial load P r is M P r X F r YF a D pw And the theoretically calculated static equivalent radial load P r is M P r F r.f a D pw Therefore, the basic rating life L is C L rev. P r 99 And the static safety factor f s considering the load factor is C f s 9. P r 9 / / Operation with shock loads. =.f=.lbs. =.9inch

6 Accuracy Dimensional accuracy and rotational accuracy of Crossed Roller Bearings are shown in Tables and. And those of High Rigidity Type Crossed Roller Bearing are shown in Table and, and Slim Type Crossed Roller Bearing is shown in Table 9. Bearings with special accuracy are also optionally available. Please consult. Table Accuracy of inner ring and accuracy of outer ring width d ominal bore over dmp Single plane mean bore dia. deviation Bs Deviation of a single inner ring width Cs Deviation of a single outer ring width K ia Radial run-out of assembled bearing inner ring incl. high low high low high low high low high low high low S ia Axial run-out of assembled bearing inner ring ote( ): When the values are not indicated in the table, those for the highest class for which they are indicated are applicable. ( ): The values of Cs for High Rigidity Type Crossed Roller Bearings are the same as those of Bs. Remarks: Accuracy in this table does not apply to High Rigidity Mounting Holed Type Crossed roller Bearing and Slim Type Crossed Roller Bearings. unit: m..... Table Accuracy of inner ring and accuracy of outer ring width for High Rigidity Type Crossed Roller Bearing d ominal bore over D ominal out side over. 9 incl. incl. 9 dmp Single plane mean bore dia. deviation Dmp Single plane mean outside dia. deviation and and B s Deviation of a single inner ring width high low high low high low high low high low 9 9 C s Deviation of a single outer ring width() high low high low high low high low high low K ia Radial run-out of assembled bearing inner ring K ea Radial run-out of assembled bearing outer ring Table Accuracy of outer ring for High Rigidity Type Crossed Roller Bearing S ia Axial run-out of assembled bearing inner ring S ea Axial run-out of assembled bearing outer ring unit: m unit: m. Table Accuracy of outer ring D ominal out side over incl. Dmp Single plane mean outside dia. deviation K ea Radial run-out of assembled bearing outer ring S ea Axial run-out of assembled bearing outer ring ote( ): When the values are not indicated in the table, those for the highest class for which they are indicated are applicable. ( ): and are applicable to High Rigidity Type Crossed Roller Bearings. For the Standard Crossed Roller Bearings in class and, values in class is applicable. Remarks: Accuracy in this table does not apply to High Rigidity Mounting Holed Type Crossed roller Bearing and Slim Type Crossed Roller Bearings. unit: m high low high low high low high low =.f=.lbs. =.9inch

7 Clearance Table 9 Accuracy of Slim Type Crossed Roller Bearings d ominal bore 9 9 dmp Single plane mean bore deviation high low Dmp Single plane mean outside deviation high low B s and C s Deviations of a single inner ring width and outer ring width high low K ia and S ia Radial and axial run-out of assembled bearing inner ring unit: m K ea and S ea Radial and axial run-out of assembled bearing outer ring The radial internal clearances of Crossed Roller Bearing are shown in Table.. The radial internal clearances of High Rigidity Crossed Roller Bearing and those of Slim Type Crossed Roller Bearings are shown in Table. and.. Table. Radial internal clearance d ominal bore of bearing over incl. T Radial internal clearances unit: m Remark: This table is not applicable to High Rigidity Mounting Holed Crossed Roller Bearing and Slim Type Crossed Roller Bearings. C C Table. Radial internal clearance for High Rigidity Mounting Holed Crossed Roller bearing d ominal bore of bearing over incl. T Radial internal clearances C unit: m C Table. Radial internal clearance unit: m d ominal bore of bearing T Radial internal clearances C ormal 9 9 =.f=.lbs. =.9inch

8 Fit The standard fits of Crossed Roller Bearings are shown in Table.. Those of Slim Type Crossed Roller Bearings with normal clearance are shown in Table.. For large bearings, fit based on the actual measured of the bearings is recoended, and fit allowance should be chosen as small as possible in accordance with the tolerance class given in Table.. When complex loads and / or shock loads are applied or when high rotational accuracy and rigidity of the bearing are required, it is recoended to use a slight interference fit adjusted to the actual measured for both inner and outer rings. For the interference fit, the radial internal clearance after the fit is decreased by approximately % to 9% of the interference amount. To avoid excessive preload due to fit, it is recoended to use a slight interference fit adjusted to the actual measured for both T and C clearances. Table. Recoended fits for Crossed Roller Bearings under normal load Radial internal clearance C clearance C clearance 9 9 h j Inner ring rotating load Housing bore H H Allowable rotational speed Allowable rotational speeds of Crossed Roller bearings are affected by mounting and operating conditions. The values in general operation are shown in Table. Table d m n values of Crossed Roller bearings Lubricant Grease Oil Type Open type With cage or separator Sealed type Open type Full complement Sealed type ote( ): d m n Value d m n where, d m Mean values of bearing bore and outside s, n umber of rotations per minutes, rpm g g Outer ring rotating load ote( ): It is recoended that a slight interference fit adjusted to the actual measured of the bearing is used. Table. Recoended fits for Slim Type Crossed Roller bearings with normal clearances (Dimensional tolerances of shaft and housing bore) d ominal bore High Inner ring rotational load Housing bore Low High Low High Outer ring rotational load Low Housing bore High J J Housing bore unit: m Low Rotational torque Rotational torque of Crossed Roller Bearings is lower than that of plain bearings and the difference between the static torque and the dynamic (kinetic) torque is small. Therefore, this bearing minimizes power consumption and operating temperature rise of machinery and increases the overall efficiency of the machine. The rotational torque is affected by many factors, and the following formula is used. D pw T P r where, T Rotational torque, Friction coefficient (Approx..) P r Static equivalent radial load, d D D pw Pitch circle, D pw If the radial clearance after mounting is a large minus value, consult. Lubrication These bearings are generally lubricated with grease. In relubrication, grease can be supplied through the clearance between the outer ring and inner ring. In the sealed type bearings, ALVAIA EP grease (SHELL) is prepacked as standard. For the bearings supplied without lubricant, customer is supposed to apply lubricant. Operating without grease or oil will increase the wear of the rolling contact surfaces and cause a short bearing life. When using special grease, carefully examine the grease properties and contents such as base oil viscosity and extreme pressure additives. In this case, please contact. Oil hole For Crossed Roller Bearings, oil holes and oil grooves can be provided by request. When an oil hole is required on the outer ring, attach "OH" before the clearance symbol in the identification number. When an oil hole and oil groove are required on the outer ring, attach " OG" in the same manner. For an oil hole on the inner ring, attach "OH", and for an oil hole and oil groove on the inner ring, attach "OG", in the same manner as well. High Rigidity Type Crossed Roller Bearings have an oil groove and two oil holes on the outer ring as standard. Table shows availability of oil holes for each bearing type. Table Oil holes Bearing type CRBF CRBH CRB CRBC Oil hole code noh nog noh nog ote( ): Only representative types are shown in the table, but this table is applicable to all Crossed Roller Bearings. ( ): CRBH and CRBF are provided with an oil groove and two oil holes on the outer ring. Remark: n denotes the number of oil holes not exceeding. For one oil hole, number is not indicated. When preparing multiple oil holes, please consult. Example Example In case of oil holes in the inner ring CRBC OH C oil holes In inner ring In case of oil hole in the outer ring CRBC OH C oil hole In outer ring Operating temperature range The operating temperature range for Crossed Roller bearings is - C to + C. However, the maximum allowable temperature for those with separator and with seal is + C, and + C when they are in continuous use under such temperature. =.f=.lbs. =.9inch

9 Mounting When the rigidity of the mounting parts is not sufficient, stress concentration will occur at the contact area between the rollers and raceways, and the bearing performance will be deteriorated significantly. Therefore, it is necessary to carefully examine the rigidity of housing and the strength of fixing bolts when a large moment will be applied. The shoulder height s (d a and D a ) that are related to mounting should certainly satisfy the values shown in the dimension tables. When these are incorrect, deformations of inner and outer rings will occur and the bearing performance will be deteriorated remarkably.. For other Crossed Roller Bearings. For Mounting Holed Type High Rigidity Crossed Roller Bearing Fig. Mounting example (Exept High Rigidity type) The inner and outer rings should be securely fixed in the axial direction by using fixing plates, etc. Recoended thickness of the fixing plate is / or more of the bearing width (B). The in axial direction of the housing bore and the fixing plates should be decided to get a secure fixing while considering the actual dimension of bearing width which is zero/minus-tolerance. (See Fig.) Fig. Mounting example - Mounting Holed Type High Rigidity Crossed Roller Bearing Mounting Holed Type High Rigidity Crossed Roller Bearing can be mounted directly to the mounting surface by fixing bolts. (See Fig.) Fig. Mounting example - Mounting Holed Type High Rigidity Crossed Roller Bearing If large number of radial load and/or moment is expected, it is recoended to prepare flange part. (See Fig.) Mounting Holed Type High Rigidity Crossed Roller Bearing has a plug for hole for inserting cylindrical rollers. When mounting the bearings, locate the plug at a position that is not included in the maximum loading zone. The plug location can be found by the pin that is at the side of the outer ring. The depth of housing bore is recoended to be the same to or larger than the bearing width. Separation prevention bolts for the outer ring are provided to prevent separation of the two halves of the outer ring during transportation or mounting. When mounting, they should be loosened slightly. High Rigidity Crossed Roller Bearing has a plug for hole for inserting cylindrical rollers. When mounting the bearings, locate the plug at a position that is not included in the maximum loading zone. The plug location can be found by the pin that is at the side of the outer ring. =.f=.lbs. =.9inch

10 Mounting Holed Type High Rigidity Crossed Roller Bearings Open type with separator Two sides sealed type with separator CRBF AT CRBF ATUU CRBF A CRBF AUU CRBF AD CRBF ADUU Open type Two side seals type Boundary dim. Mounting holes Mounting Inner ring Outer ring d D B r min r min PCD Mounting holes PCD Mounting holes d a D a Basic dynamic C Basic static C CRBF AT CRBF AT CRBF AT CRBF AT CRBF AT CRBF AT UU CRBF AT UU CRBF AT UU CRBF AT UU CRBF AT UU M through -M through -M through -M through -M through -. through. counter bore depth. -. through. counter bore depth. -. through. counter bore depth. -. through counter bore depth. -. through 9. counter bore depth CRBF AT CRBF AT UU. -M through CRBF A CRBF AD CRBF A UU CRBF AD UU through 9. counter bore depth. -. through 9. counter bore depth. ote( ): Minimum allowable single value of chamfer r and r. Remarks. Outer ring has an oil groove and two oil holes.. Open type is supplied without grease. Perform proper lubrication. Grease is pre-packed in tow sides sealed type. =.f=.lbs. =.9inch

11 High Rigidity Crossed Roller Bearings Open type with separator High Rigidity Crossed Roller Bearings Two sides sealed type with separator CRBH A CRBH AUU Boundary dim. d D B Mounting r min d a D a Basic dynamic C Basic static C Boundary dim. d D B Mounting r min d a D a Basic dynamic C Basic static C CRBH A.. 9 CRBH A UU.. 9 CRBH A.. 9 CRBH A UU.. 9 CRBH A.... CRBH A UU.... CRBH A CRBH A UU CRBH A.... CRBH A UU.... CRBH A.... CRBH A UU.... CRBH A.9. 9 CRBH A UU.9. 9 CRBH A. 9. CRBH A UU. 9. CRBH A.. 9 CRBH A UU.. 9 CRBH A.. CRBH A UU.. 9 CRBH 9 A CRBH 9 A UU CRBH A.. 9 CRBH A UU.. 9 CRBH A.. CRBH A UU.. CRBH A. CRBH A UU. CRBH A. 9 9 CRBH A UU. 9 9 CRBH A.9 9 CRBH A UU.9 9 CRBH A. 9 CRBH A UU. 9 CRBH A. 9 9 CRBH A UU. 9 9 CRBH A.9. 9 CRBH A UU.9. 9 ote( ): Minimum allowable single value of chamfer r. Remarks. Outer ring has an oil groove and two oil holes.. Open type is supplied without grease. Perform proper lubrication. ote( ): Minimum allowable single value of chamfer r. Remarks. Outer ring has an oil groove and two oil holes.. Grease is pre-packed. 9 =.f=.lbs. =.9inch

12 Standard Crossed Roller Bearings Standard type (With cage) Standard type (Full complement) CRBC CRB 9 With cage CRBC CRBC CRBC CRBC CRBC CRBC CRBC 9 Full complement CRB CRB CRB CRB CRB CRB CRB Boundary dim. d D B Mounting CRBC Basic dynamic Basic static C C r min d a D a Basic dynamic C CRB Basic static C With cage CRBC CRBC CRBC CRBC CRBC CRBC CRBC CRBC CRBC Full complement CRB CRB CRB CRB CRB CRB CRB CRB CRB Boundary dim. d D B Mounting Basic dynamic r min d a D a 9 C 9 CRBC Basic static C 99 9 Basic dynamic C CRB Basic static C 9 CRBC CRBC CRBC CRBC CRBC CRBC CRBC CRB CRB CRB CRB CRB CRB CRB CRBC CRBC CRBC CRBC CRBC CRBC CRBC CRBC CRB CRB CRB CRB CRB CRB CRB CRB CRBC CRBC CRBC CRB CRB CRB CRBC CRBC CRBC CRB CRB CRB ote( ): Minimum allowable single value of chamfer r. Remarks. Oil hole is not provided.. Grease is not pre-packed. Perform proper lubrication. =.f=.lbs. =.9inch

13 Standard Crossed Roller Bearings Two sides sealed type (With cage) Two sides sealed type (Full complement) CRBC UU CRB UU With cage Full complement CRBC UU CRB UU. Boundary dim. d D B Mounting CRBC UU CRB UU Basic dynamic Basic static Basic dynamic Basic static r min d a D a C C C C. 9 With cage CRBC UU Full complement CRB UU. Boundary dim. d D B r min. Mounting CRBC UU CRB UU Basic dynamic Basic static Basic dynamic Basic static d a D a C C C C CRBC UU CRB UU.. 9 CRBC UU CRB UU CRBC UU CRB UU.9. CRBC UU CRB UU CRBC UU CRBC UU CRBC UU CRBC 9 UU CRBC UU CRB UU CRB UU CRB UU CRB 9 UU CRB UU CRBC UU CRBC UU CRBC UU CRBC UU CRBC UU CRB UU CRB UU CRB UU CRB UU CRB UU CRBC UU CRB UU. ote( ): Minimum allowable single value of chamfer r. Remarks. Oil hole is not provided.. Grease is not pre-packed. Perform proper lubrication. =.f=.lbs. =.9inch

14 Slim Type Crossed Roller Bearings Open type (With cage) Open type (Full complement) Slim Type Crossed Roller Bearings Two sides sealed type (With cage) Two sides sealed type (Full complement) V AUU VUU With cage Full complement V Boundary dim. d D B Mounting V Basic dynamic Basic static Basic dynamic Basic static r min d a D a C C C C With cage A UU Full complement V UU Boundary dim. d D B Mounting A UU V UU Basic dynamic Basic static Basic dynamic Basic static r min d a D a C C C C. 9 9 V 9. A UU V UU 9. V. 9 A UU V UU. 9 V A UU V UU V A UU 9 V UU V A UU V UU. 9 9 V. A UU V UU. V. 9 A UU V UU. 9 V 99. A UU V UU 99. V. A UU V UU. 9 V. A UU V UU. V A UU V UU V A UU V UU V. 99 A UU V UU V A UU 9 V UU V. 9 9 A UU V UU. 9 ote( ): Minimum allowable single value of chamfer r. Remarks. Oil hole is not provided.. Grease is not pre-packed. Perform proper lubrication. ote( ): Minimum allowable single value of chamfer r. Remarks. Oil hole is not provided.. Grease is not pre-packed. Perform proper lubrication. =.f=.lbs. =.9inch

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