Wear Resistant Flat Thrust Bearing 51110 For Transmission Systems

51110 Thrust Ball Bearing: 50mm ID, 70mm OD, 14mm Thick For Transmission Systems

The 51110 flat thrust bearing occupies a crucial position in the field of mechanical transmission. With its excellent design and reliable performance, it provides stable axial support for numerous pieces of equipment, ensuring their efficient operation.

1. Basic Dimensions

1. Inner Diameter (d): 50mm. Meticulously designed to fit a variety of standard shaft diameters, it forms a tight fit with the shaft, enabling efficient transmission of axial force and preventing shaft system displacement. This serves as a fundamental guarantee for the stable operation of mechanical systems.

2. Outer Diameter (D): 70mm. It forms a reasonable ratio with the inner diameter, providing sufficient installation space for rolling elements and cage assemblies. Meanwhile, it conforms to the trend of compact equipment design, achieving good load-bearing effects within limited space.

3. Thickness (T): 14mm. The thickness design balances load-bearing capacity and operational flexibility. When bearing axial loads, the bearing rings have sufficient strength to resist deformation; during operation, the reasonable thickness reduces friction between rolling elements, minimizes heat generation, and improves the operating efficiency of the equipment.

2. Structural Features

It adopts a separable structure, consisting of a shaft washer (interference-fit with the shaft and rotating with it), a housing washer (transition-fit with the equipment housing or support base and fixed in place), and a steel ball-cage assembly. This structure allows individual installation and disassembly of each component, greatly simplifying the equipment assembly process, facilitating later maintenance, and effectively reducing maintenance costs and downtime. It should be noted that the 51110 flat thrust bearing can only bear unidirectional axial loads and cannot withstand radial loads. In practical applications, it needs to be paired with radial support components (such as deep groove ball bearings) to form a complete shafting support solution.

3. Core Materials

1. Bearing Rings: High-carbon chromium bearing steel, such as SAE-52100 or GCr15, is mostly used. After quenching and tempering, the hardness can reach HRC 60-64, featuring excellent wear resistance, fatigue resistance, and impact toughness. It can withstand contact stress caused by axial loads for a long time, significantly extending the service life of the bearing. In special working conditions (such as strong corrosion environments), stainless steel is adopted to enhance the bearing's corrosion resistance.

2. Rolling Elements: Bearing steel balls of the same material as the bearing rings are usually used. Their surfaces undergo precision grinding, with roundness error controlled at the micron level, effectively reducing friction loss when in contact with the bearing rings and ensuring smooth operation. For extreme working conditions such as high temperature and high speed, ceramic rolling elements (e.g., silicon nitride ceramics) can be selected, which have the advantages of high hardness, low friction, high temperature resistance, and corrosion resistance, further optimizing the bearing's performance.

3. Cages: Conventional models often use nylon materials (e.g., PA66), which are lightweight, have a low friction coefficient, and good self-lubricating properties. They can accurately guide the uniform distribution of steel balls, prevent collision between rolling elements, and ensure stable operation of the bearing. In high-speed or high-temperature environments, stamped steel or brass cages are used to enhance structural stability and high-temperature resistance.

4. Key Performance Parameters (Taking Mainstream Brands as Examples)

1. Rated Load: The basic dynamic load rating (C) is approximately 28.8kN, and the basic static load rating (C₀) is about 75.4kN. It can meet the axial load requirements of various small and medium-sized equipment, such as medium-sized conveyors and small cranes.

2. Speed Performance: The limiting speed is approximately 3100r/min under grease lubrication, and can reach 4800r/min under oil lubrication. In actual use, the speed should be adjusted reasonably according to factors such as lubrication method and load magnitude to prevent overheating damage to the bearing caused by overspeed.

3. Applicable Temperature: Under conventional working conditions, the applicable temperature range is -40℃ to 120℃. With high-temperature grease and special materials, the applicable temperature can be extended to above 150℃, meeting the operation requirements of equipment under different ambient temperatures.

5. Lubrication Requirements

1. Grease Lubrication: Suitable for scenarios with relatively low speed (≤3000r/min) and inconvenient oil replenishment. Lithium-based grease (e.g., Grade EP2) is recommended, with a filling amount of 1/3-1/2 of the bearing's internal space. Grease lubrication not only provides good dustproof and sealing effects but also effectively reduces friction and wear.

2. Oil Lubrication: Applicable to high-speed (>3000r/min) or high-load working conditions. ISO VG32 or VG46 extreme-pressure industrial gear oil is recommended, and lubrication is performed through oil bath or oil injection. Oil lubrication can quickly dissipate heat generated during operation, significantly improving heat dissipation efficiency and ensuring stable operation of the bearing under harsh working conditions.

6. Typical Application Fields

1. Small and Medium-Sized Mechanical Equipment: Such as the paper-feeding shaft support of medium-sized printing machines and the axial positioning of lifting mechanisms in small elevators, undertaking key tasks of axial positioning and load transmission.

2. Transmission Systems: Commonly used in the axial support of reducer output shafts and motor end covers, as well as the axial limit of rotors in some small compressors. It ensures stable operation of the transmission system and efficient power transmission.

3. Light Industry and Agricultural Equipment: Applied in some roller shafts of textile machinery, certain hydraulic system components of small tractors, and main shafts of agricultural product processing equipment. It adapts to the light-load and medium-low speed operation characteristics of the equipment, providing reliable support for stable equipment operation.

With its precise dimensions of 50mm inner diameter, 70mm outer diameter, and 14mm thickness, combined with a separable structure, high-quality wear-resistant materials, and stable load-bearing performance, the 51110 flat thrust bearing has become an ideal choice for many small and medium-sized machinery that require high axial support accuracy and space compactness, providing reliable axial support guarantees for the long-term stable operation of equipment.