INBIURO is technical and sales representative of the bearing and drive manufacturer TECMA. 
We can deliver slew bearing with prameters:

• diameter 144mm up to 3800mm
• design as silgle or double row ball bearing or cross roller bearing
• material C45, 42CrMo4 and even 46CrMo4
• equipped with external or internal teeth or without teeth
• hardened teeth upon request
• anti rust protection
• special seal protection
• preload upon request

SLEWING RING

Types and design

Differently from normal bearings (where the ring is pressed on the shaft of pressed into a whole) the rings of slewing bearings are bolted to machine parts. Depending on the purpose, the outer or inner ring can be made with a gear enabling transmission of power. There are also slewing rings without gear.

The holes made in the rings allow them to be connected to machine components, allowing their relative rotation. The rings can have through holes, blind or threaded holes. The variety of the shapes of the rings and the methods of their mounting allow the wide use and adaptation of the bearing to the application.

Slewing bearings enable to carry of high axial loads and moments. They are widely used in industry as well as in working machines and cranes. The bearings can be equipped with seals that allow to operate in difficult conditions or in dusty environment. Depending on the needs and application, the sealing may have different cross-sections and characteristics. Bearings require periodic lubrication. For this purpose, the rings are equiped with grease nipples.

he bearing rings are made of steel and the raceways are hardened by induction hardening. Rolling elements can be balls or rollers. Balls are used in low and medium load bearings. Ball bearings can be single or double row. The rolling elements in high load bearings are usually rollers. Plastic separators are placed between the rolling elements. For special designs, steel, aluminium or brass cages can be used.

When selecting a bearing, one must take into account all axial and radial loads on the bearing. In addition, the moments acting on the bearing must be also considered. The value of safety factor depends on the application in which the bearing is to be used.

Typical applications

wind turbines

radar

rotating platforms

excavators

forestry machines

harbour lifts

cranes

aerial platforms

chargers and manipulators

Slewing drives

Slewing bearings can be provided as a part of drive modules equipped with gearbox and housing. Such a module can be connected to a motor and used in industrial application or machine. As a drive one can use AC or DC electric motor or hydraulic motor as well.