Bearings


HepcoMotion PRT2 bearings are available in five sizes to suit the five ring slide sections. Bearings can be used with more than one ring size.


The following bearing formats and fixing methods cater for most design requirements:


Twin Bearing type has the smoothest running quality, is easiest to adjust and offers some compliance to accommodate misalignment. It has two deep groove ball bearings on a single stud, and is the usual choice for many systems.


Double Row Bearing type (DR) incorporates a one-piece outer ring with two ball tracks. It offers more load capacity, life and stiffness, and copes better with debris. Dimensions are identical to the twin bearings type. DR bearings are more demanding of installation tolerances and it is recommended that they are specified with the CHK option*4


.


Nitrile Sealed option (NS) available for both bearing formats, provides better sealing against water or debris than the metal shielded type. A small increase in friction may result.


See 20 for the bearing and lubrication selector.


Through Fixing Type (RSJ/RLJ) C1


C2 A K *6 B1 B C *5 P J *2 & 6 F M M1


Eccentric (DE)*2 L


N*3


Concentric (C)*2 O*1


*5 Short stud (SJ) / Long stud (LJ) Part Number


... J13 ... ... J18 ... ... J25 ... ... J34 ... ... J54 ...


R12 - R20 -


- For use with A B B1*4 C TNMS 12.7 10.1 5.47 5.8 9.5 R25 RD25 RES, RIS TNS REL, RIL S1 TNL


REV, RIV TNV 18 12.4 6.75 7.4 25 16.6 9 9.8


C1 C2


RSJ RLJ RSJ RLJ RSJ RLJ 3


6.7 2.2 2.4


14 3.4 10 2.4 2.5 19 3.8 13 2.2 4.9


R44 RD44 REM, RIM TNM 34 21.3 11.5 13.8 22 6.6 14.8 5.2 5.9 R76 -


54 34.7 19 17.8 30 8.2 20.4 5.7 7.9 Q R*3


1.2 1.5


S T


8 10.5 10 7


9 12


T1 T2 U ±0.1


4 5


8 10


38 50


U1 V W X Y Z


1.5 1.0 6.25 6.6 8.5 3.75 6.75 30 47.5 8 2 3 4 8


54 72


Notes: 1.


11 24.5 M4 14


2.0 9.5 8.5 17.5 6.5 12.5 60 90.5 17 3.0 14.5 16.4 23.5 10.5 18.5 89.5 133 25


20 M3 5.5 8 7


7


32 M5 8.5 10 42 M6 10 14 62 M8 13 20


It is recommended that holes to suit bearing mounting studs should be reamed to tolerance F6 for a sliding fit.


2. Nuts and washers are supplied with both concentric and eccentric RSJ/RLJ type bearings. 3. 'N' is the eccentric offset due to the double eccentric design (2 x N = total stroke). R dimension is both the eccentric offset of the adjusting nut and total stroke at the bearing centerline.


4. Controlled height (CHK) bearings are selected in ±0.010mm bands in respect of the B1 dimension. They are supplied in sets of up to 50 parts as standard, with larger sets on request.


5. For adjusting tool part numbers see table. For adjustment procedure and fixing nut tightening torques see 7. Stainless steel bearings are only available nitrile sealed. 34 58.


6. Fasteners for the through fixing type bearings are black on the concentric version and bright zinc plated on the eccentric version for identification purposes, except stainless steel type.


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