Barrel roller bearing, are suitable for high speeds and heavy loads. These rollers have two rows of rollers in a common curved slope in the outer ring, and two slopes in their inner ring make an angle with respect to the bearing axis. The bearing is self-regulating, so it is not sensitive to shaft asymmetry, and in addition to bearing radial loads, it also bears axial loads on both sides.
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Barrel roller bearing
The rolls of this product are long, convex and symmetrical in number, which gives these characteristics an extremely high tolerance of these types of bearings against forces. Their inner hole is produced in two types of cylindrical and conical with a slope of 1:30 (positive k30) and a slope of 1:12 (positive k).
Barrel roller bearing designs
In those characterized by the CC, C, and EC suffixes, the balls are symmetrical, the inner ring has no edges, and there is a socket window for each row of balls. The Guide Ring is centered on the inner ring. The EC types have greater load-bearing strength with reinforced balls.
The special payment of the rollers and shafts in the CC type has resulted in a significant reduction in friction. It should be noted that the guide ring is a means of better guiding the rollers in their forward movement and rotation.
Designs identified by the suffixes CAC, ECAC, CA, ECA are used in larger series. The rollers are symmetrical and have an edge inner ring. The guide ring is centered on the inner ring and the window is moulded integrally and made of steel or bronze.
The ECAC type, CAC has higher paid levels than the CC and the two types of ECAC, ECA have reinforced sleeves with higher load bearing capacity.
In the type designated by the suffix E, the bolts are symmetrical, the edgeless inner ring and the centered guide ring are located near the outer ring. The number of bearing windows is also two, this type of design also has all the characteristics of the CC type, and the design of the bearing window stands in the way that it has allowed the placement of larger or more number of bolts, as a result of which the bearing load bearing strength has increased.
Placing the guide ring close to the outer ring allows for better synchronization between the ring and the coils.
Most series of this type of bearing have a groove and three holes in the outer ring for psychological action. This feature is characterized by the suffix W33 (in the E design the suffix W33 is not bound).
Barrel rolling bearings with a symbol bowl are also produced. The symbol bowl is in two pieces, one piece is attached to the upper ring and the other part to the lower ring. In rolling bearings with a symbol bowl, there is a possibility of a deviation of up to 0.5o in the lower ring compared to the upper ring.
The presence of a bowl also reduces the operating temperature range between 30°C and +150°C. In this case, the bearing has a grease.
For vibration points, there are special roller bearings that are derived from the CC design.
The sawdust window in them is hardened to the surface and has good resistance to wear, the guide ring is focused on the slope of the outer ring and has a specific fork. VA405, JA, A15 are different types of design in the applications discussed.
To prevent corrosion from scratches, the holes inside some of them are produced with a PTFE teflon coating (back of this series is VA406).
The operating temperature range of the barrel roller bearings is set to +200 c.
They are designed to withstand axial loads as well. This value depends on the amount of friction between the bush and the shaft if the bearing is mounted on the bush, and is derived from this relationship:
Fap=3Bd
Maximum permissible axial load, Fap=N
Rolling bearing width, B=mm
Inner diameter of roller bearing, d=mm
