Cross roller slewing bearing is often used in large rotary devices such as bucket wheel excavators, heavy transport machinery, port machinery, mining machinery, and construction engineering machinery, playing an important role in engineering machinery. Below, we will detail the functions of cross roller slewing bearings.
The structure is compact, lightweight, precisely manufactured, with small assembly clearance, and requires high installation accuracy. The rollers are arranged in a 1:1 cross pattern and can simultaneously bear axial force, overturning moment, and large radial force.
The standard type of cross roller slewing bearing is divided into two parts of the outer or inner ring. After the rollers and retainers are installed, they are fixed together. When installing, the ideal load state can be achieved by adjusting the connecting bolts and fixing flanges, making the installation process very simple.
Because the rollers are arranged perpendicular to each other on the V-shaped grooved rolling surface at 90° through the spacer retainer, the cross roller slewing bearing can bear loads in all directions, such as large radial loads, axial loads, and moment loads.
The size of the inner and outer rings of the cross roller slewing bearing is minimized, especially the ultra-thin structure, which has high rigidity and is therefore most suitable for industrial robot joints or rotating parts, machining center rotary tables, mechanical arm rotating parts, precision rotary worktables, medical equipment, measuring instruments, IC manufacturing devices, and other widely used applications.
Based on the basic type of cross roller slewing bearing, many cross roller slewing bearings with structural differences have been derived to meet different requirements. From a broad perspective, they can be divided into basic type cross roller slewing bearing, high rigidity cross roller slewing bearing, and ultra-thin cross roller slewing bearing. From an external structure perspective, there are inner ring segmented, outer ring segmented, and inner and outer ring integrated. From an internal structure perspective; there are full-roller type, metal window-type retainer type, and nylon or metal insulator block-type. According to the connection method, there are bolt connection type, rivet connection type, spring disc type, and so on, with a wide variety of types.
Firstly, the structure of cross roller slewing bearing is much simpler. With a row of cylindrical rollers arranged in a single roller path in a cross pattern, considerable axial and radial carrying capacity and overturning moment can be obtained. In addition, the cross roller slewing bearing will not cause one side of the rollers to contact or lock. Moreover, because the standard type cross roller slewing bearing has a segmented structure of the inner and outer rings, the clearance can be adjusted, and even under applied preload, high-precision rotational motion can be achieved.