The hinge parts of hydraulic cylinders on construction machinery, automatic swing turnover tooling and suspension connection positions of special vehicles work under long-term reciprocating swing and small-angle deflection conditions. The supporting pivot needs to bear heavy radial impact loads and allow angular compensation of components. Ordinary steel-on-steel spherical plain bearings have a high friction coefficient during operation and require regular grease replenishment. Routine maintenance is difficult to carry out for field equipment or internally sealed equipment. Traditional bushing structures lack flexible swing performance and are prone to jamming and abrasion under angular displacement. Industries including construction machinery and automated equipment are in urgent demand for self-lubricating spherical plain bearings that do not require continuous oil supply and adapt to swing working conditions.

Outdoor construction equipment and sealed automatic modules operate in complex environments with alternating dust, water vapor and mud. Once the lubrication of pivot bearings fails, seizure, rust and enlarged internal gaps caused by wear will occur quickly, leading to equipment shaking and decreased control precision. Many hydraulic actuators have limited internal space, making it impossible to arrange oil lubrication pipelines. Frequent shutdown maintenance will greatly reduce construction and production efficiency. Conventional bearings can hardly balance load capacity, swing freedom and long-term maintenance-free performance. High-quality self-lubricating spherical plain bearings are urgently needed by all kinds of hydraulic equipment and heavy swing mechanisms to ensure long-term stable operation.

NMT Self-Lubricating Spherical Plain Bearings consist of an inner spherical ring and an outer spherical ring. The matching spherical surfaces can realize multi-angle relative swing with self-aligning capability to compensate assembly errors and angular displacement during operation. The inner spherical surface is attached with high-performance solid lubricating composite material, which continuously releases lubricant during operation. It maintains a low friction coefficient under long-term reciprocating swing and realizes maintenance-free operation without regular grease refilling. The bearings feature sufficient load capacity to sustain continuous radial loads and short-term impact loads, suitable for heavy-load hinge points such as cylinder joints and suspension pivots. Surface anti-corrosion treatment is optional to resist erosion from water vapor and weak corrosive media. Overall dimensions follow universal industrial standards for convenient replacement during renovation of new and old construction machinery and automatic equipment, adapting to working conditions such as low-speed reciprocating swing and intermittent deflection.

The inner and outer substrates are made of high-strength alloy steel, formed by precision forging to optimize the metallographic structure of spherical stress areas and improve impact resistance and fatigue resistance of substrates. Spherical mating surfaces go through precision machining and grinding to achieve high spherical contour accuracy and ensure smooth swing without jamming. The solid lubricating layer adopts high wear-resistant composite material, tightly bonded with the substrate and hardly peeling off to deliver sustained lubrication effect. Anti-corrosion plating features excellent adhesion, effectively isolating mud and humid air to retard rusting. All products pass dimensional verification and swing running-in tests to control initial clearances and avoid abnormal wear after assembly.

The bearings cover a complete series of specifications with excellent interchangeability. Widely applied in hydraulic cylinder hinge points of excavators and loaders, suspension pivots of special vehicles, automatic turnover tooling, connecting rod mechanisms of agricultural machinery, swing connection assemblies of mining conveying equipment and hinge positions of water conservancy opening and closing machinery, meeting long-term maintenance-free demands of all kinds of heavy-load swing hinge pivots.

Core Product Advantages

Spherical matching structure with self-aligning function, effectively compensating assembly deviation and operational angular displacement to prevent motion jamming;

Built-in solid lubricant providing continuous lubrication during operation, realizing maintenance-free performance without regular grease refilling, ideal for installation locations without continuous oil supply;

Outstanding load capacity to withstand continuous static loads and instantaneous impact loads, suitable for heavy-load hinge points of construction machinery;

Optional anti-corrosion surface treatment resisting erosion from water vapor and mud, adapting to harsh outdoor and humid working environments;

Stable friction coefficient under low-speed swing, smooth reciprocating deflection operation, resistant to seizure and scratch after long service time;

Compact structure with simple installation mode, directly serving as hinge pivots and simplifying structural design of equipment connecting rods;

Wide working condition adaptability, supporting multiple motion modes including intermittent swing, small-range reciprocating rotation and low-frequency deflection;

Standard overall dimensions compatible with mounting structures of mainstream equipment, requiring no large-scale frame modification during equipment upgrading.

Typical Application Scenarios

Hydraulic cylinder hinge pivots of excavators, loaders and bulldozers; connecting rods of agricultural machinery and swing mechanisms of harvesting equipment; suspension connection points of special engineering vehicles and sanitation vehicles; automatic production line turnover tooling and reciprocating swing actuator modules; hinge assemblies of mining conveying equipment and screening machinery; connecting rod pivots of water conservancy gate opening and closing equipment; swing connection mechanisms of heavy-duty logistics lifting equipment.

Quality Assurance

NMT Self-Lubricating Spherical Plain Bearings adopt high-strength bearing alloy steel raw materials. Incoming materials complete composition inspection and metallographic sampling to strictly control internal impurity content. Blanks of inner and outer rings are formed by precision die forging to optimize metal flow distribution of spherical load-bearing areas and enhance impact resistance. Multiple stages of stress relief treatment are carried out after rough machining to eliminate internal stress generated by forging and cutting processing and prevent deformation under long-term load operation. Precision grinding is applied on spherical friction surfaces to strictly control sphericity and surface finish and guarantee smooth swing movement.

The solid lubricating composite layer is thermally pressed and tightly combined with the substrate to avoid risks of delamination and peeling. All semi-finished products pass visual flaw detection and dimensional inspection one by one to remove defective workpieces. Components go through cleaning and drying before assembly. Finished products complete swing durability tests, salt spray anti-corrosion simulation tests and load performance tests. All unqualified products are eliminated thoroughly to guarantee stable performance of bulk goods and provide long-term maintenance-free support solutions for heavy-load swing hinge mechanisms.

Product Range

Open self-lubricating spherical plain bearings, closed dust-proof self-lubricating spherical plain bearings. Versions with ordinary treatment or anti-corrosion coating are optional. Selection depends on load magnitude, swing angle and service environment.

Brand Strength

NMT devotes itself to R&D and manufacturing of spherical plain bearings. Targeting industry pain points such as difficult maintenance, rusting and scratching of hydraulic hinges on construction machinery and automatic swing mechanisms, NMT continuously optimizes spherical surface processing technology and solid lubrication formulas. The bearings effectively solve common failures including difficult lubrication, excessive abrasion and rapid clearance expansion of pivot bearings on field equipment, extend maintenance cycles of construction machinery, reduce shutdown maintenance frequency of automatic production lines and lower comprehensive equipment operation costs.