30x47x11 Flat Thrust Ball Bearing 51106 For Transmission Systems

51106 Thrust Ball Bearing: 30mm ID, 47mm OD, 11mm Thick For Transmission Systems

The 51106 flat thrust bearing, a significant component within the thrust ball bearing series, is pivotal in offering axial support across a wide array of mechanical applications. Its meticulous design in dimensions and robust performance attributes underpin the stable and efficient operation of diverse machinery.

1. Basic Dimensions

1. Inner Diameter (d): 30mm. Engineered with precision, this inner diameter is tailored to interface seamlessly with a variety of standard shafts. This ensures a snug fit, enabling the efficient transfer of axial forces and safeguarding against any potential shaft misalignment or displacement, which is fundamental for the reliable operation of mechanical assemblies.

2. Outer Diameter (D): 47mm. Complementing the inner diameter, the 47mm outer diameter is optimized to create an ideal space for the rolling elements and cage assembly. It not only provides ample room for these components to function smoothly but also adheres to the space - saving requirements of modern, compact machinery designs, making it suitable for applications where space is at a premium.

3. Thickness (T): 11mm. The 11mm thickness strikes a balance between load - bearing capacity and rotational agility. When subjected to axial loads, the bearing rings are fortified with sufficient strength to resist deformation, ensuring structural integrity. Simultaneously, this thickness minimizes frictional resistance during the movement of the rolling elements, curbing heat generation and enhancing the overall operational efficiency of the machinery over extended periods.

2. Structural Features

The 51106 flat thrust bearing adopts a separable construction, comprising a shaft washer, a housing washer, and a steel ball - cage assembly. The shaft washer, which has an interference fit with the shaft, rotates in tandem with the shaft. In contrast, the housing washer, with a transition fit to the equipment housing or support base, remains stationary. This separable design streamlines the installation and disassembly processes of individual components. It simplifies equipment assembly, reduces maintenance complexity, and curtails both maintenance costs and equipment downtime. It is important to note that the 51106 flat thrust bearing is designed to handle unidirectional axial loads only and is not suitable for withstanding radial loads. In practical applications, it is often paired with radial - supporting components such as deep - groove ball bearings to establish a comprehensive shafting support system.

3. Core Materials

1. Bearing Rings: Predominantly, high - carbon chromium bearing steels like SAE - 52100 or GCr15 are utilized. After undergoing quenching and tempering treatments, these steels achieve a hardness range of HRC 60 - 64. This imparts exceptional wear resistance, fatigue resistance, and impact toughness, allowing the bearing rings to endure the high contact stresses induced by continuous axial loading over long service life cycles. In more demanding environments, such as those with corrosive elements, stainless - steel materials are selected to enhance the bearing's corrosion resistance capabilities.

2. Rolling Elements: Typically, bearing steel balls of the same material as the bearing rings are employed. Their surfaces are precision - ground to achieve micron - level roundness tolerances. This high - precision finish significantly reduces friction losses during contact with the bearing rings, ensuring smooth and stable rotational motion. For extreme operating conditions, such as high - temperature or high - speed applications, ceramic rolling elements, like silicon nitride ceramics, can be substituted. These ceramic alternatives offer advantages such as high hardness, low friction coefficients, excellent high - temperature resistance, and corrosion resistance, thereby further optimizing the bearing's performance under harsh conditions.

3. Cages: In standard models, nylon materials, such as PA66, are commonly used for cages. Nylon cages are lightweight, possess low friction coefficients, and exhibit good self - lubricating properties. These characteristics enable them to precisely guide the uniform distribution of steel balls, preventing collisions between rolling elements and ensuring the stable operation of the bearing. In high - speed or high - temperature scenarios, stamped steel or brass cages are preferred. These materials enhance the cage's structural stability and heat resistance, ensuring reliable performance in challenging environments.

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

1. Rated Load: The basic dynamic load rating (C) for the 51106 flat thrust bearing typically ranges from approximately 22.8 - 23.5 kN, while the basic static load rating (C₀) falls in the range of 41.5 - 43.0 kN. These ratings enable the bearing to effectively meet the axial load demands of a wide range of small - to - medium - sized equipment, such as certain types of conveyor systems and small - scale hoisting machinery.

2. Speed Performance: Under grease lubrication, the limiting speed of the 51106 bearing is around 4000 - 4300 r/min. With oil lubrication, this can be elevated to 6000 - 6500 r/min. In actual operation, factors such as the lubrication method and the magnitude of the applied load must be carefully considered when determining the operating speed. This is crucial to avoid over - speeding the bearing, which can lead to excessive heat generation and subsequent damage.

3. Applicable Temperature: In normal operating conditions, the 51106 flat thrust bearing can function within a temperature range of - 40°C to 120°C. By employing high - temperature grease and specialized materials, this temperature range can be extended to over 150°C, enabling the bearing to adapt to the operating requirements of equipment in both normal and elevated - temperature environments.

5. Lubrication Requirements

1. Grease Lubrication: Grease lubrication is well - suited for applications with relatively low rotational speeds (≤4000 r/min) and where frequent oil replenishment is inconvenient. Lithium - based grease, such as Grade EP2, is recommended, with a filling volume of 1/3 - 1/2 of the bearing's internal space. Grease lubrication serves multiple functions, including dust prevention, sealing, and friction reduction, thereby extending the bearing's service life in such conditions.

2. Oil Lubrication: For high - speed applications (＞4000 r/min) or those with high - load requirements, oil lubrication is the preferred choice. ISO VG32 or VG46 extreme - pressure industrial gear oils are typically recommended, and lubrication can be achieved through either oil bath or oil injection methods. Oil lubrication effectively dissipates the heat generated during operation, significantly enhancing the bearing's heat dissipation efficiency and ensuring stable operation under demanding working conditions.

6. Typical Application Fields

Given its dimensional and performance characteristics, the 51106 flat thrust bearing finds extensive use in several industries:

1. Small and Medium - Sized Machinery: It is commonly employed in the axial positioning and load - transfer mechanisms of equipment such as small - scale printing presses, where it ensures precise movement and reliable load - bearing during operation. In addition, it is used in the lifting mechanisms of some small - sized medical examination tables, providing stable axial support for smooth height adjustments.

2. Transmission Systems: The 51106 bearing plays a vital role in the axial support of certain types of gearbox output shafts, helping to maintain the stability of the transmission system and ensuring efficient power transfer. It is also used in the axial limiting mechanisms of some types of positive - displacement pumps, such as vane pumps, ensuring the proper alignment and operation of the pump's rotors.

3. Light Industry and Agricultural Machinery: In the textile industry, it is utilized in the roller shaft supports of some knitting machines, adapting to the light - load and medium - low - speed operation characteristics of these machines. In agricultural applications, it can be found in the hydraulic systems of small - scale tractors, providing reliable axial support for the proper functioning of hydraulic cylinders and valves, contributing to the stable operation of agricultural machinery.

In summary, with its precise dimensions of 30mm inner diameter, 47mm outer diameter, and 11mm thickness, combined with a separable structure, high - quality wear - resistant materials, and reliable load - bearing performance, the 51106 flat thrust bearing stands as an optimal choice for a wide range of small - to - medium - sized machinery that demands high - precision axial support and compact space utilization. It provides a dependable axial support solution for the long - term, stable operation of equipment.