Tapered roller bearings adopt tapered rollers as rolling elements with tapered raceway structures, capable of bearing relatively large radial loads and unidirectional axial loads simultaneously. They are usually assembled in pairs in opposite directions to withstand bidirectional axial force. Force transmission is realized through line contact between rollers and raceways with outstanding load capacity. They are widely applied on transmission positions subject to complex alternating loads, including various vehicle gearboxes, axles, construction machinery transmission mechanisms, reducers, metallurgical equipment and mine conveying devices. Compared with cylindrical roller bearings, tapered roller bearings can bear both radial and axial loads. Different from angular contact ball bearings, the roller structure delivers stronger heavy-load and impact resistance. However, higher friction resistance leads to relatively lower limiting rotating speed, making them more suitable for medium-low speed heavy-load transmission conditions. Engineering vehicles and mining equipment operate continuously in bumpy and dusty environments. Transmission systems sustain superposed composite loads of radial force and axial force. Alternating impact loads are generated constantly during start-up, shutdown and steering. Ordinary bearings are prone to fatigue damage. Conventional tapered roller bearings available on the market generally have defects including insufficient precision of roller profile machining, poor dimensional consistency between large and small ends and surface defects on raceways. Uneven preload occurs after paired assembly. Long-term continuous load operation easily causes excessive temperature rise, increasing noise and early spalling failure of raceways. NMT Tapered Roller Bearings feature complete product series with multiple taper angle specifications. Stamped steel cages and solid cages are optional, together with abundant clearance models. Sizes cover small-medium specifications and large standard dimensions, fully satisfying supporting demands of commercial vehicles, construction machinery and heavy-duty reducers.

With continuous development of construction machinery and commercial vehicle industries, vehicle transmission systems and heavy machinery gearboxes endure complex composite loads and frequent impact loads all year round. The industry sets higher requirements on bearing load capacity, impact resistance and service life. Most transmission boxes have compact installation space. Bearings sustain alternating composite radial and axial loads during operation, imposing strict requirements on roller machining precision and geometric shape of raceways. Frictional heat generates during equipment operation. Excessive internal friction loss of bearings causes continuous temperature rise, rapidly accelerating aging of lubricating grease and shortening maintenance intervals of transmission components. A large number of ordinary tapered roller bearings adopt loose roller grouping control with wide dimensional dispersion, leading to uneven stress after paired assembly. Insufficient impact toughness of cages easily triggers wear and deformation under vibration and dusty conditions and causes sudden bearing damage. Equipment manufacturers are in urgent demand of high-quality tapered roller bearings with high load capacity, excellent shock resistance, stable operation and long service life. Optimized with revised roller crowning profile design to effectively relieve edge stress concentration of rollers and improve stress distribution in contact zones, NMT Tapered Roller Bearings adopt strict high-precision roller screening and grouping procedures to guarantee highly unified dimensions of all rolling elements. Upgraded ultra-precision grinding of inner and outer tapered raceways improves surface finish and geometric accuracy of raceways and reduces operating friction, providing stable and reliable supporting solutions under composite loads for all kinds of vehicles and heavy industrial machinery.

NMT Tapered Roller Bearings consist of inner ring, outer ring, tapered rollers and cages. The unique tapered structure enables bearings to bear radial loads and unidirectional axial loads simultaneously. Two sets of bearings installed oppositely can undertake bidirectional axial loads. Multiple taper angles are optional: models with small taper angles focus on radial load capacity, while versions with large taper angles feature stronger axial load performance. Stamped steel cages are light in weight and adapt to conventional transmission conditions; solid cages deliver high structural strength, outstanding shock and vibration resistance, suitable for harsh operating environments such as construction vehicles. Precisely sorted rollers cooperate with ultra-fine ground tapered raceways to effectively restrain heavy-load vibration and delay fatigue damage. All rollers complete precision grouping and screening before assembly to strictly control dimensional errors and guarantee balanced force of paired bearings under load. The products are extensively matched on heavy truck gearboxes, drive axles, loaders, excavator transmission assemblies, industrial reducers, mine conveying equipment, metallurgical transmission mechanisms and other devices.

Inner rings, outer rings and tapered rollers are manufactured from high-purity bearing chromium alloy steel. Multiple forging processes refine internal grain structure. Precise constant-temperature quenching and tempering guarantee qualified hardness on working surfaces of raceways and rollers while the matrix retains reasonable toughness to resist fatigue spalling induced by long-term alternating composite loads and impact loads. Multiple ultra-precision grinding procedures are carried out on inner and outer tapered raceways to reduce surface roughness and cut frictional heat during operation. All finished bearings pass dimensional precision inspection, roller grouping screening, clearance verification, long-time heavy-load temperature rise durability test and vibration grade detection. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Various taper angles and clearance specifications are optional with standard industry outer dimensions and excellent interchangeability for convenient maintenance and replacement of transmission spare parts for construction machinery and vehicles.

Core Product Advantages

Line contact structure of tapered rollers bears large radial loads and unidirectional axial loads simultaneously; paired installation realizes bidirectional axial load bearing;

Multiple taper angle specifications support flexible selection according to the ratio of radial and axial loads to balance load performance;

Two cage options including stamped steel cage and solid cage adapt to ordinary transmission and harsh conditions with strong impact and vibration respectively;

Optimized roller crowning relieves edge stress concentration and effectively avoids local wear and pitting corrosion under heavy-load operation;

High-precision graded rollers feature narrow dimensional deviation, realizing uniform load distribution after paired assembly and greatly extending anti-fatigue service life;

Ultra-precision grinding applied on tapered raceways achieves excellent surface finish, lowers frictional resistance and restrains temperature rise during long-term operation;

Premium bearing alloy steel combined with mature heat treatment delivers great wear resistance, impact resistance and anti-spalling performance to extend service cycles of transmission components;

Standardized outer dimensions with strong versatility for convenient replacement of spare parts for all types of construction machinery, commercial vehicle axles and gearboxes.

Typical Application Scenarios

Drive axles and gearboxes of heavy trucks, light trucks and passenger buses; transmission assemblies of loaders, excavators, road rollers and other construction machinery; large and medium-sized gear reducers and planetary reduction devices; transmission mechanisms of mine belt conveyors and crushing equipment; auxiliary transmission assemblies of metallurgical rolling mills; gearboxes and walking mechanisms of large agricultural machinery; supporting transmission positions of large hoisting equipment and lifting machinery.

Quality Assurance

Raw materials of NMT Tapered Roller Bearings receive sampling inspection on hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner rings and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision grinding of tapered raceways. All tapered rollers are graded and grouped according to high precision standards to guarantee balanced load distribution of bearings under heavy-load operation. Impact durability and wear resistance tests are conducted on formed cages. All finished goods pass visual inspection, clearance screening, geometric precision detection and long-time heavy-load vibration & temperature rise durability test. Special models dedicated for vehicles and construction machinery receive additional alternating impact simulation tests. Non-conforming products are separated independently. Every tapered roller bearing features stable load capacity, strong impact resistance and low operating noise, effectively lowering failure and shutdown risks of transmission systems for construction equipment and commercial vehicles.

Product Range

Tapered roller bearings with multiple taper angle specifications; stamped steel cages and solid cages optional; multiple clearance ranges; covering small-medium to large industrial standard sizes. Model selection depends on the ratio of radial and axial loads, impact intensity, rotating speed and service environment.

Brand Strength

NMT focuses on R&D and manufacturing of tapered roller bearings. Targeting operating characteristics including composite loads, frequent impact and continuous vibration for engineering vehicles and heavy-duty reducers, NMT continuously optimizes roller crowning design, tapered raceway grinding technology and cage structural strength standards. The bearings solve industry pain points such as heavy-load stress concentration, impact wear and fatigue failure after long-term operation, help manufacturers of construction machinery and auto parts improve overall stability of transmission systems and extend maintenance intervals of components.