What is the difference between cross cylindrical roller slewing rings and crossed cylindrical roller bearings?

What is cross cylindrical roller slewing ring

Cross cylindrical roller slewing ring is a kind of slewing bearing device, composed of two seat rings, using a cylindrical roller structure arranged in a cross arrangement, the rollers are separated and positioned by isolation blocks, which can bear axial force, radial force and overturning moment at the same time, has a high bearing capacity and slewing accuracy, and is often used in hoisting machinery, construction machinery, port machinery and some equipment and machinery that require high-precision and high-load slewing movement, so as to realize the stable connection and flexible rotation between the relative slewing moving parts.

Features of cross cylindrical roller slewing rings

High load-bearing capacity: The cylindrical roller structure with cross arrangement is adopted, and the rollers are in linear contact with the raceway, which can withstand greater axial force, radial force and overturning moment than the point-contact structure, which can meet the needs of heavy equipment and high-load conditions.

High precision: the precise arrangement of the rollers and the positioning of the isolation block make the slewing ring maintain a high rotation accuracy during operation, effectively reduce the shaking and deviation during operation, and can meet some equipment with high requirements for motion accuracy, such as precision machine tools, radar antenna bases, etc.

Compact structure: The structural design of this slewing ring is more compact, occupies less space, and has more advantages in the space layout of the equipment, which is conducive to the miniaturization and lightweight design of the equipment, especially suitable for occasions with limited space but high bearing capacity.

Easy installation: its structural form makes the installation process relatively simple, generally only need to connect the two seat rings with the fixed parts and rotating parts of the equipment respectively through bolts, which can effectively shorten the assembly time of the equipment and improve the production efficiency.

High rigidity: Due to the reasonable arrangement of the rollers and the design of the seat ring, the whole has high rigidity, and the deformation is small when bearing the load, which can ensure the stability of the equipment during operation and prolong the service life of the equipment.

Good interchangeability: The standardized design and manufacture make the cross cylindrical roller slewing ring have good interchangeability, when a component is damaged, it is easy to replace the corresponding part, reducing the maintenance cost and downtime of the equipment.

Wear resistance: The selection of high-quality materials and advanced heat treatment technology makes the roller and raceway surface have high hardness and wear resistance, which can maintain good performance in long-term operation and reduce the impact of wear.

Strong adaptability: It can adapt to different working environments and working conditions, whether it is in high temperature, low temperature, humid or dusty and other harsh environments, as long as appropriate protective measures are taken, it can work reliably and has strong environmental adaptability.

What is the difference between cross cylindrical roller slewing rings and crossed cylindrical roller bearings?

Cross cylindrical roller slewing rings and crossed cylindrical roller bearings have the following differences:

Structural features

Cross cylindrical roller slewing rings: usually consisting of two seat rings, the cylindrical rollers between the seat rings are arranged in a 1:1 cross arrangement, and the rollers are generally separated by isolation blocks. It comes with mounting holes, internal or external gears, lubricating oil holes, and seals, among others.

Cross-cylindrical roller bearings: The rollers between the inner and outer rings are arranged perpendicular to each other at 90°, and the rollers are fitted with spacer holders or isolation blocks. Some types of crossed cylindrical roller bearing inner and outer rings are split structures, and the clearance can be adjusted.

carrying capacity

Cross cylindrical roller slewing bearing: mainly used to bear comprehensive load, can bear large axial force, radial force and overturning moment at the same time, suitable for heavy load conditions.

Crossed cylindrical roller bearings: can withstand loads in all directions, such as radial, axial and moment loads, but in general, their load carrying capacity may be slightly lower than that of cross cylindrical roller slewing rings of the same size, but it is enough to meet the load requirements of many high-precision equipment.

Application scenarios

Cross cylindrical roller slewing rings: widely used in construction machinery, such as cranes, excavators, loaders, etc.; port machinery such as port cranes, gantry cranes, etc.; converters, electric furnaces, etc. in metallurgical machinery; There are also wind turbine nacelle slewing parts in wind power generation, etc.

Crossed cylindrical roller bearings: commonly used in the joints or rotating parts of industrial robots, rotary tables of machining centers, rotating parts of manipulators, precision rotary tables, medical instruments, measuring instruments, IC manufacturing equipment, etc.

Precision and rigidity

Cross cylindrical roller slewing bearing: the manufacturing accuracy is high, the assembly clearance is small, and a certain rotation accuracy can be guaranteed, but compared with the crossed cylindrical roller bearing, it is slightly inferior in accuracy and rigidity, but it can meet the slewing accuracy requirements of most heavy equipment.

Crossed cylindrical roller bearings: with excellent rotational accuracy, due to the cross arrangement of the rollers and the special structural design, it has high rigidity in both the radial and axial directions, and can maintain high precision at high speed rotation.

Dimensions and installation

Cross cylindrical roller slewing ring: the size is usually large, the structure is relatively complex, the installation foundation and accuracy requirements are high, and the parameters such as horizontality, verticality and concentricity of the seat ring need to be strictly controlled.

Crossed cylindrical roller bearings: the size of the inner and outer rings is miniaturized, especially the ultra-thin structure is more common, the installation space requirement is small, the installation operation is relatively simplified, the outer ring or the inner ring that is divided into two parts, after the roller and the retainer are installed, they are fixed together, and the installation is more convenient.

Cross cylindrical roller slewing ring supplier

As a well-known supplier of slewing bearings with 30 years’ experience, LTZC bearings is committed to providing slewing bearings with high quality and low price. The specific price needs to be comprehensively evaluated according to the size, load, material and accuracy requirements of the bearings. Please contact us if necessary.