Printing Press Spherical Roller Bearing

The spherical Printing Press Spherical Roller Bearings manufactured by KOMEL have two rows of rollers that can withstand relatively large radial loads and are suitable for printer parts that carry heavy loads, such as press roller stands. The outer ring rail is spherical and the inner ring has two rails inclined at a certain angle to the axis of the bearing. This structure provides the carrier with excellent self-alignment performance, allowing it to automatically adapt to shaft deviations or positioning errors caused by various factors during printer operation, thus ensuring normal operation between all components, compensating for errors, and improving integration positioning stability and accuracy.

There are two types of internal holes: cylindrical and conical. The slope of a tapered hole is usually between 1:30 and 1:12. With the adapters or retractable sleeves, the Printing Press Spherical Roller Bearings of the clamping sleeves with tapered internal holes can be easily and quickly mounted on flat shafts or stepped machine shafts, which is convenient for the advantages of disassembling and assembling the clamping unit.

A machined copper cage is usually used and the outer ring is fixed with a fastener adapted to the eccentric loading conditions. Durable Printing Press Spherical Roller Bearings have good wear resistance and strength, which ensures even distribution of rolls and normal operation, as well as extends the life of the bearings. There are also cases where a steel cage is used. After heat treatment and surface hardening, the wear resistance is improved, which can reduce the cost to some extent and at the same time meet the requirements of press operation.

Parameter (Specification)

Suffixes

Internal Design

BC: Bearings with a cast iron cage guided by the rollers, suitable for the main shafts of wind turbines.

CA/CAC: The inner ring has ribs on both sides, with a guide ring guided by the cage, and a machined brass cage.

CC(J)/CJ: The inner ring has no rib, with a guide ring guided by the cage, and two stamped steel cages.

CCJA/EJA: The inner ring has no rib, with a guide ring guided by the outer ring, and two stamped steel cages.

CAF: Similar to the CA type, but with a machined steel cage.

ECA/ECAC: Fork-shaped machined brass cage, the inner ring has ribs on both sides, with a guide ring guided by the inner ring and an enhanced roller set.

External Design (Seals, Snap Grooves, etc.)

-CS, -2CS: One side or both sides are equipped with contact NBR seals.

-CS2, -2CS2: One side or both sides are equipped with contact FKM seals.

-CS5, -2CS5: One side or both sides are equipped with contact HNBR seals.

-RS, -2RS: One side or both sides are equipped with contact NBR seals.

-RS5, -2RS5: One side or both sides are equipped with contact HNBR seals.

K: Tapered bore with a taper of 1:12.

K30: Tapered bore with a taper of 1:30.

Cage Design

F: Machined steel cage, guided by the inner ring.

FA: Machined steel cage, guided by the outer ring.

J: Stamped steel cage, guided by the inner ring.

JA: Stamped steel cage, guided by the outer ring.

MA: Machined brass cage, guided by the outer ring.

Material and Heat Treatment

235220: The inner ring is case-hardened, and the inner bore has a spiral groove.

HA3: The inner ring is case-hardened.

Precision, Clearance, Preload, and Quiet Operation

C08: The rotational accuracy meets the P5 tolerance grade.

C083: C08 + C3.

C084: C08 + C4.

C2: The radial internal clearance is smaller than the normal grade.

C3: The radial internal clearance is larger than the normal grade.

C4: The radial internal clearance is larger than C3.

C5: The radial internal clearance is larger than C4.

P5: The dimensional accuracy and rotational accuracy meet the P5 tolerance grade.

P6: The dimensional and rotational accuracy meet the P6 tolerance grade.

P62: P6 + C2.

Lubrication

GEM9: Filled with 70–100% of SKF LGHB 2 grease.

VT143: Filled with 25–45% of SKF LGEP 2 grease.

VT143C: Filled with 70–100% of SKF LGEP 2 grease.

W64: Solid oil.

W: The outer ring has no lubrication groove and lubrication holes.

W20: The outer ring has three lubrication holes.

W26: The inner ring has six lubrication holes.

W33: The outer ring has a lubrication groove and three lubrication holes.

W33X: The outer ring has a lubrication groove and six lubrication holes.

W77: Inserted W33 lubrication holes.

W513: W26 + W33.

Other Variants

R505: Bearings for railway axle boxes.

VA405: Bearings for vibrating machinery, with a case-hardened stamped steel cage.

VA406: Similar to VA405, but the inner bore of the cylindrical inner ring is coated with PTFE.

VA991: Bearings suitable for high-speed applications.

VE552(E): The outer ring on one side has three equidistant threaded holes for connecting lifting equipment. E indicates that the bearing is equipped with a lifting eye bolt.

VE553(E): Similar to VE552(E), but the outer ring on both sides has threaded holes.

VG114: Case-hardened stamped steel cage.

VQ424: The rotational accuracy is higher than C08.

Application

Printing Cylinder Support: The printing cylinders are the core components of a printing press, including the plate cylinder, blanket cylinder, and impression cylinder, etc. Spherical roller bearings are used to support these cylinders, bearing the relatively large radial loads generated during the high-speed rotation of the cylinders to ensure the precise rotation of the cylinders. During the printing process, the cylinders may experience a certain degree of deflection due to factors such as changes in paper thickness and uneven ink distribution. The self-aligning performance of the spherical roller bearings can automatically compensate for this deflection, maintaining the parallelism between the cylinders, thus ensuring the registration accuracy of printing and avoiding quality problems such as ghosting and blurring.

Paper Feeding Mechanism: The paper feeding mechanism is responsible for accurately conveying the paper to the printing position. Spherical roller bearings are installed in parts such as the paper gripper shaft, bearing the impact force and friction during the paper feeding process. Their good load-carrying capacity and self-aligning performance can ensure the stable movement of the paper grippers, guarantee the accurate transfer of the paper, and improve the efficiency and quality of printing. At the same time, under long-term high-speed operation, the wear resistance and reliability of the bearings can effectively reduce the number of equipment maintenance and downtime.

Ink Delivery and Water Delivery Systems: The ink rollers of the ink delivery system and the water rollers of the water delivery system need to maintain stable rotation and precise contact pressure during operation. Spherical roller bearings are applied to the support parts of these rollers, capable of bearing the weight of the ink rollers and water rollers as well as the loads generated by the pressure of ink and water during their rotation. Through the self-aligning function, the bearings can compensate for the slight deviations that occur during the installation and operation of the rollers, ensuring uniform contact between the ink rollers and water rollers, so that the ink and water can be evenly transferred to the printing plate, thus achieving high-quality printing results.

Transmission System: The transmission system of the printing press includes components such as gears and chains, which are used to transmit power and motion. Spherical roller bearings are installed on the transmission shaft, bearing the torque and radial force during the transmission process. Their self-aligning performance can reduce the additional stress caused by the installation errors or deformation of the transmission components during operation, ensuring the smooth operation of the transmission system and improving the transmission efficiency. In addition, the good sealing performance of the bearings can prevent impurities such as dust and ink from entering, protect the lubrication state inside the bearings, and extend the service life of the bearings.

Paper Delivery Mechanism: The paper delivery mechanism is responsible for neatly collecting the printed papers. Spherical roller bearings are applied to parts such as the paper delivery cylinder, bearing the weight of the paper and the tension during the paper delivery process. Through the self-aligning and load-bearing functions, the bearings can ensure the stable rotation of the paper delivery cylinder, enabling the paper to be smoothly collected and stacked, avoiding problems such as paper wrinkling and skewing, and improving the quality and efficiency of paper delivery.