Technical Systems with Ring Slides in Bearings
It is usual to space bearings equally around the ring*1. When calculating the life, the load should be resolved into the direct load components LA and LR and the moment load component M, as shown in the diagram opposite.
System Load Capacities
Capcities are shown for both 'dry' and 'lubricated' conditions - this refers to the bearing and slide 'V' contact, since all bearings are lubricated internally for life.
Values are based on shock-free duty.
Bearing Part
Numbers
Used with Ring
Slides ...J13... R12 ...J18...
R20 REV RIV
...J25...
R25 RES RIS
...J34...
R44 REM RIM
...J54...
R76 REL RIL
Number
of equally spaced
bearings
3 4
67 83
Each additional 1 10 3 4
135
Each additional 1 21 3 4
Each additional 1 48 3 4
N N Nm N N Nm N N Nm 38 16 x Øc*4 45 19 x Øc*4 6 2 x Øc*4 76 32 x Øc*4
180 102 43 x Øc*4 220 120 52 x Øc*4 30 9 x Øc*4
43
165 90 39 x Øc*4 13 4 x Øc*4
300 170 72 x Øc*4 370 200 87 x Øc*4 30 9 x Øc*4
375 170 90 x Øc*4 465 200 108 x Øc*4 50 18 x Øc*4
90
960 510 230 x Øc*4 1190 600 278 x Øc*4 230 150 48 x Øc*4
Each additional 1 96 3 4
600 340 140 x Øc*4 2400 1200 570 x Øc*4 740 400 170 x Øc*4 2950 1400 690 x Øc*4 60 19 x Øc*4
570 350 120 x Øc*4
Not Available Not Available Not Available
570 510 135 x Øc*4 700 600 165 x Øc*4 135 150 28 x Øc*4 1200 1280 285 x Øc*4 1480 1500 340 x Øc*4 285 375 60 x Øc*4 2700 2550 640 x Øc*4 3340 3000 780 x Øc*4 640 750 135 x Øc*4
Each additional 1 210 130 44 x Øc*4 The LR load capacities for systems using floating bearings
1350 765 320 x Øc*4 5400 2740 1290 x Øc*4 7500 4250 1800 x Øc*4 1670 900 390 x Øc*4 6650 3200 1560 x Øc*4 9300 5000 2170 x Øc*4 1290 800 270 x Øc*4
1800 1250 375 x Øc*4 36 are the same as is shown above for DR bearings. The LA & M load capacities for systems using floating bearings are zero (they are free to float in these directions).
To determine the life of this system, first obtain a value for the load factor LF by entering the values for LA, LR and M in respect of the proposed duty into equation [2] below, together with the maximum load capacities from the table above.
[2] LF = LA LA(max) + LR LR(max) + M M(max) The life is then determined using equations [3] or [4] on on the next page.
Notes: 1.
In some applications where the bearings rotate with the load, it may be beneficial to distribute the bearings unequally around the ring. Contact Bishop-Wisecarver for application advice.
2. SPEED OF OPERATION. Hepco ring slides, segments and track systems are rated for speeds of 1m/s without lubrication or 5m/s when lubricated, but take care to allow for intertial loads. Greater speeds may be tolerated at reduced loads. Contact Bishop-Wisecarver for details.
3. SHORT STROKE OPERATION. If the stroke length is less than five times the bearing outside diameter, then calculate the life as if the stroke is five times the bearing outside diameter.
4. Øc is ring slide contact diameter in meters (the diameter of the circle through the mid position of the contact points between the bearings and the ring).
Øc Øc 1 or 0.8 for stainless steel
Track system 40-41
Dry System (Twin and DR Type Bearings)
LA(max) LR(max) M(max)
Lubricated System (Twin Type Bearings)
LA(max) LR(max) M(max)
Lubricated System (DR Type Bearings)
LA(max) LR(max) M(max)
Bearings 34-36
LA M
LR
Ring slides 26-33
FCC carriage 38-39
BCP carriage 47
55
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