NMT Ltd.
Corporate Communications Department
NMT Four-Point Contact Ball Bearings Precision Support Bearings For Swing Heavy-Load Slewing Mechanisms
During operation of rotary platforms and rotating working mechanisms, radial force, forward and reverse axial thrust as well as overturning moments frequently exist simultaneously. Conventional matched bearing sets require complicated assembly and occupy extra internal space, hindering lightweight design of complete machines. Many rotary mechanisms mainly operate with low-speed reciprocating swing and intermittent rotation, featuring frequent start-stop and varying loads. Bearings with inadequate load structure easily suffer partial raceway wear, resulting in rotary stagnation and increased clearance, which damages equipment positioning accuracy. Malfunction of rotary components on lifting and automatic rotating equipment leads to production suspension and potential safety risks. The market demands four-point contact ball bearings with compact structure that can bear complex moment loads with single unit.
Japan NMT optimizes the arc raceway design of four-point contact ball bearings to realize four-point bearing contact of balls. A single bearing undertakes multi-directional combined loads and overturning moments, simplifying mechanical assembly and reducing the usage of multiple bearing sets. Precisely ground balls and raceways lower friction loss caused by reciprocating swing and restrain local pitting induced by long-term alternating loads. The highly integrated structure features compact radial and axial dimensions to facilitate miniaturized layout of machinery.
Various sealing assemblies are optional to prevent dust and foreign matter from invading raceway contact surfaces. Compatible with long-life grease lubrication for low-speed long-time intermittent operation. Dimensions conform to universal industrial standards for convenient renovation and replacement of new and old rotary equipment.
Core Product Advantages
Integrated complex load bearing: Four-point contact structure enables single bearing to withstand radial, bidirectional axial loads and overturning moments.
Simplified mechanical assembly: No need for multiple matched bearing sets, reducing component quantity and optimizing overall structure.
Adaptable to low-speed swing: Suitable for reciprocating swing and intermittent rotation to endure alternating loads from frequent start and stop.
Compact space-saving structure: Integrated design cuts required installation space compared with matched bearing solutions.
Anti-pitting and wear-resistant raceways: Precisely ground raceways distribute alternating stress and slow surface damage caused by long-term swing.
Flexible sealing options: Dust-proof sealing structures are available to fit dusty, outdoor and various working environments.
Application Scenarios
Rotary worktables and numerical control indexing devices of automatic equipment; small rotary mechanisms of construction machinery; rotary seats of light lifting machinery; rotary joints of industrial robots; rotating brackets for solar tracking systems; rotary station modules of packaging machinery.
Precision Quality Assurance
NMT four-point contact ball bearings are produced according to manufacturing standards of precision rotary bearings with full-process quality control. Strict impurity inspection is conducted for raw materials. Inner and outer raceways as well as balls receive high-precision grinding. All finished products pass moment load tests, reciprocating swing durability tests and clearance accuracy inspections. Complete specifications and favorable interchangeability support stable bulk supply for automation and construction machinery manufacturers.
Product Range
General four-point contact ball bearings and precision adjustable clearance types; open and dust-sealed versions available. Professional selection suggestions based on rotary moment and operating rotating speed are provided.
Brand Strength
Japan NMT devotes to research and production of precision bearings for rotary motion, solving industry challenges including complicated bearing assembly of rotating mechanisms, easy wear under multi-directional loads and insufficient service life under swing conditions. With raceway profile simulation optimization and ultra-precision processing technology, NMT continuously improves products and supplies rotary support bearing solutions for automation equipment, construction machinery and intelligent equipment industries.