1. The structure and working principle of NMT thrust bearings

Thrust bearings, also known as stop-back bearings, are mechanical components specifically designed to bear axial loads. Unlike deep groove ball bearings and angular contact ball bearings, which mainly bear radial loads, the core design of thrust bearings lies in bearing the thrust along the axis direction. Their basic structure consists of an inner ring (the ring that mates with the shaft), an outer ring (the ring that mates with the bearing housing), rolling elements (steel balls or rollers), and a cage.

 

NMT thrust bearings are mainly divided into two categories: thrust ball bearings and thrust roller bearings.

 

Thrust ball bearings are a type of split bearings. The inner ring and outer ring can be separated from the cage, the steel balls, and the components. This split structure makes installation, disassembly, and maintenance extremely convenient. Thrust ball bearings are further classified based on the direction of load bearing: single-direction thrust ball bearings can withstand axial loads in one direction, and double-direction thrust ball bearings can withstand axial loads in both directions. Thrust ball bearings are suitable for applications with medium and low speeds and axial loads as the main load. NMT thrust ball bearings use high-purity bearing steel, with the steel balls undergoing strict grading and selection, and the raceways being processed with ultra-precision grinding to ensure smooth operation and low noise.

 

Thrust roller bearings also have a split structure and are used to bear axial loads as well as combined axial and radial loads. However, the radial load should not exceed 55% of the axial load. Compared to thrust ball bearings, thrust roller bearings have rolling elements and raceways in line contact, which results in higher bearing capacity and greater rigidity. They are suitable for heavy-duty and low-speed conditions. NMT thrust roller bearings cover types such as thrust cylindrical roller bearings, thrust conical roller bearings, and thrust self-aligning roller bearings.

 

NMT thrust bearings use vacuum degassed high-carbon chromium bearing steel. After special heat treatment by "Ottaplay," the surface hardness reaches HRC62-64, with an anti-fatigue limit that is 38% higher than that of ordinary products, and the rated life is more than 2 times higher than industry standards. The wide temperature range lubricating grease maintains stable lubrication performance within the range of -45°C to 155°C, with the maintenance period reaching up to 30,000 hours.

 

2. Core performance advantages of NMT thrust bearings

First, they are specifically designed for axial load bearing. The raceway geometry structure of NMT thrust bearings has been optimized to ensure uniform contact stress distribution when the rolling elements bear axial loads. Thrust roller bearings, with their line contact structure, have a higher bearing capacity than thrust ball bearings of the same size, especially suitable for heavy-duty scenarios.

 

Second, flexible selection of single-direction or double-direction. NMT offers single-direction thrust bearings (capable of bearing axial loads in one direction) and double-direction thrust bearings (capable of bearing axial loads in both directions). Users can choose flexibly based on the axial load direction characteristics in the equipment.

 

Third, the split structure facilitates installation and maintenance. The inner ring and outer ring of NMT thrust bearings can be separated from the cage, the steel balls, and the components, allowing for separate assembly of the inner ring and outer ring during installation, significantly reducing assembly difficulty. During maintenance and replacement, there is no need to disassemble the entire shaft system, significantly shortening equipment downtime.

 

Fourth, excellent fatigue resistance and long service life. NMT uses vacuum degassed high-carbon chromium bearing steel, with a surface hardness of HRC62-64 after special heat treatment. The high-purity steel reduces non-metallic inclusions to an extremely low level, eliminating the potential for fatigue cracks to form from the source. The rated life is more than 2 times higher than industry standards.

 

Fifth, stable operation in a wide temperature range. NMT thrust bearings are filled with long-lasting low-volatile lubricating grease, maintaining stable lubrication performance within the wide temperature range of -45°C to 155°C. The high-purity bearing steel and special heat-stabilizing treatment ensure that the bearings maintain dimensional stability in temperature variations, with the maintenance period reaching up to 30,000 hours.

 

Sixth, diverse types cover all scenarios. The NMT thrust bearing product line covers various types such as thrust ball bearings (unidirectional/bidirectional), thrust cylindrical roller bearings, thrust conical roller bearings, and thrust self-aligning roller bearings, suitable for a wide range of working conditions from light-load high-speed to heavy-load low-speed.

 

3 Main industrial application scenarios of NMT thrust bearings

3.1 Machine tool spindles and precision equipment

 

In machine tool spindles, thrust bearings bear the huge axial thrust generated during tool cutting. NMT thrust angular contact ball bearings, with high precision and axial rigidity, ensure the stable processing accuracy of the spindle during heavy-load cutting. In precision grinding machines, CNC lathes, and other equipment, the low-vibration and high-rigidity characteristics of NMT thrust bearings guarantee the surface quality of the workpiece.

 

3.2 Industrial robot joints

 

In robot joints, the handling of axial forces is often the most demanding aspect for bearings. NMT thrust cylindrical roller bearings effectively withstand axial combined loads in robot shoulders, waists, and wrists. NMT upgrades the cage of the thrust cylindrical roller bearings from traditional metal material to reinforced engineering plastics, not only reducing operating noise but also reducing the risk of damage in case of accidental jamming.

 

3.3 Construction machinery and mining equipment

 

Construction machinery and mining equipment are subjected to huge axial impact loads. NMT thrust self-aligning roller bearings have an automatic self-aligning function, capable of compensating for installation errors and shaft deflection deformations, and are widely used in excavator rotation mechanisms, crane swivel supports, tower cranes, etc. Thrust cylindrical roller bearings are mainly used in heavy-load scenarios such as oil drilling rigs, iron and steel manufacturing machinery, etc.

 

3.4 Power generation equipment and ships

 

In water turbines, vertical motors, etc., thrust self-aligning roller bearings bear huge axial loads, ensuring the axial positioning accuracy of the rotor during high-speed rotation. Ship propeller shafts also extensively use thrust bearings, bearing the huge axial thrust generated by the propeller during propulsion.

 

3.5 Automobiles and new energy

 

In automotive gearboxes, steering mechanisms, etc., thrust bearings bear the axial loads generated during gear shifting and steering. In the drive systems of new energy vehicles, NMT thrust bearings, with high reliability and long lifespan, provide a guarantee for the axial positioning of the electric drive system.

 

3.6 Aerospace and defense

 

In aerospace engines, satellite attitude control systems, etc., which have extremely high requirements for reliability and accuracy, NMT thrust bearings, with their wide temperature range adaptability, high reliability, and long lifespan, become an important choice for key transmission components.

 

4 Selection, installation, and daily operation guidelines

4.1 Key points for structural selection

 

Load direction selection: single-direction axial load selects single-direction thrust bearings; bidirectional axial load selects bidirectional thrust bearings.

 

Type selection: for medium and low-speed light-load scenarios, select thrust ball bearings; for heavy-load low-speed scenarios, select thrust roller bearings; for compensation of installation errors, select thrust self-aligning roller bearings.

 

Accuracy grade selection: for general transmission, select standard accuracy; for precision scenarios such as machine tool spindles, select P5/P4 grade.

 

Sealing form selection: open type is suitable for circulating oil lubrication; sealed type is pre-filled with lubricating grease, suitable for maintenance-free scenarios.

 

4.2 Installation precautions

 

Thrust bearings are of a separated structure. During installation, it is necessary to distinguish between the shaft ring and the seat ring. The inner diameter of the shaft ring is usually machined and is relatively small. During installation, the shaft ring should be installed onto the shaft first, then the seat ring should be installed onto the bearing housing, and finally the rolling elements and cage components should be installed. When installing, use special tools to evenly transfer the force to the rings, and strictly prohibit directly striking the rolling elements or cage. For bidirectional thrust bearings, ensure that the shaft rings and seat rings of both directions are correctly matched during installation.

 

4.3 Lubrication management suggestions

 

Sealed bearings with pre-filled lubricating grease generally do not require mid-term replenishment of lubricating oil or grease. Open-type thrust bearings need to be replenished with lubricating oil or grease according to the maintenance cycle. The high-speed operation scenarios require strict control of the amount of grease filling - excessive filling will intensify the stirring and heating. For environments that are humid or corrosive, it is recommended to use lubricants that are resistant to hydrolysis and rust prevention. Thrust bearings must be subjected to a preload of approximately 1% of the axial rated static load as a pre-load.

 

4.4 Daily Inspection Items

 

Regularly monitor the operating noise and bearing temperature - if the working temperature rise exceeds 45℃, the machine should be shut down for inspection. Persistent sharp abnormal sounds usually indicate insufficient lubrication or the intrusion of foreign objects. Check the damage of the sealing components to prevent the continuous invasion of water and dust, which could cause the raceways to rust or pitting. The high-precision manufacturing and strict quality control of NMT thrust bearings ensure that they can achieve a long service life of over tens of thousands of hours under normal usage conditions.

 

5 The Import Substitution Value and Supply Chain Advantage of NMT Thrust Bearings

 

High-end equipment manufacturers such as machine tool spindles, industrial robots, and construction machinery have a continuous and rigid demand for high-precision thrust bearings. For a long time, the high-precision thrust bearing market has been dominated by overseas brands, with problems such as long supply cycles, high unit prices, and slow response times for supporting services.

 

NMT thrust bearings strictly follow international precision manufacturing standards for production. Their core indicators such as axial bearing capacity, rotational accuracy, and fatigue life can rival those of leading imported brands, meeting the dual needs of new machine batch assembly and maintenance spare parts.

 

The dimensions are strictly in accordance with international standards, and they can be fully interchangeable with existing imported bearings without any additional processing or structural modifications. General models have a large inventory of spare parts available, which can meet emergency repairs and batch purchases, effectively reducing the pressure on enterprises' spare parts inventory. The simplified distribution channels and localized technical support significantly reduce procurement costs and communication costs, optimizing the overall budget for mechanical equipment manufacturing.

 

High-quality NMT thrust bearings provide precise axial support for key transmission parts such as machine tool spindles, robot joints, and construction machinery, ensuring the long-term stable operation of equipment under heavy load and high-precision conditions.

 

NMT supports temperature-adaptive substrate selection, thermal-stable structure optimization, wide temperature range lubrication customization, and special structural non-standard customization. Main size specifications have a ready-to-use inventory, and installation dimensions follow industry standards, allowing for direct replacement of imported similar products.