Durable Double Row Self Aligning Ball Bearing 1217 High Radial Load

1217 Self-aligning Ball Bearing: High Radial Load, Aligning & Durable for Machinery

I. Product Overview

The 1217 self - aligning ball bearing is a high - precision mechanical component designed to meet the operational demands of diverse machinery in complex and harsh conditions. As a key member of the self - aligning ball bearing series, it has specific dimensional parameters: an inner diameter (d) of 85mm, an outer diameter (D) of 150mm, and a width (B) of 28mm. These dimensions make it versatile for a wide range of applications where significant radial loads need to be managed effectively, and shaft misalignment issues may affect the stable operation of machinery.

II. Structural Design

2.1 Rolling Elements

The 1217 bearing is equipped with two rows of precisely manufactured spherical balls. These balls are made from high - quality bearing steel, such as GCr15, which is known for its excellent hardness and superior wear - resistance. The production process follows strict quality control standards, ensuring each ball has a smooth surface and accurate dimensional precision. The spherical shape of the balls creates a larger contact area with the raceways compared to some other bearing types. This larger contact area helps distribute the load evenly across the bearing components, reducing the risk of local stress concentrations that could lead to premature wear and failure.

2.2 Raceways

The inner ring of the 1217 bearing features a double - row raceway design, while the outer ring has a spherical raceway. The spherical outer - ring raceway is the core of the bearing's self - aligning function. It allows the inner ring and balls to adjust their positions relative to the outer ring, effectively compensating for misalignment between the shaft and the housing. Both the inner and outer ring raceways undergo advanced heat - treatment processes to achieve a high surface hardness, generally in the HRC58 - 64 range. This high hardness gives the bearing excellent wear - resistance and fatigue - resistance, enabling it to withstand various operating conditions and extend its service life significantly.

2.3 Cage

A high - strength steel cage is used to separate and guide the balls in the 1217 bearing. The cage is precisely designed with pockets that hold the balls securely, preventing them from colliding during high - speed rotation. This ensures smooth and stable rolling of the balls, contributing to the overall reliability and efficiency of the bearing. In some advanced designs, the cage may be coated with special materials or undergo additional heat - treatment to further enhance its strength, wear - resistance, and ability to operate in harsh environments, such as high - temperature, high - contamination, or corrosive settings.

III. Performance Characteristics

3.1 Radial Load - Carrying Capacity

The 1217 self - aligning ball bearing is primarily designed to bear substantial radial loads. Its double - row ball configuration, combined with the large contact area between the balls and raceways, allows it to withstand significant radial forces. Although the exact basic rated dynamic load rating (Cr) varies by manufacturer and specific product specifications, it is generally suitable for applications involving medium - to - heavy radial loads. This makes it a popular choice in various machinery, including motors, conveyors, industrial gearboxes, and manufacturing equipment, where reliable radial load support is crucial for smooth and efficient operation.

3.2 Limited Axial Load - Carrying Ability

While the 1217 bearing is mainly intended for radial loads, it can handle a small amount of axial load in either direction. However, subjecting it to large or pure axial loads can cause uneven loading on the balls, accelerating wear and reducing the bearing's lifespan. The rib structure on the inner and outer rings, along with the ball arrangement, enables the bearing to resist a limited degree of axial thrust. This limited axial load - carrying capacity is useful in applications with minor axial forces in addition to dominant radial loads, providing flexibility in handling complex load situations.

3.3 Exceptional Self - Aligning Capability

The most notable feature of the 1217 bearing is its excellent self - aligning property. The spherical outer - ring raceway allows the bearing to automatically adapt to misalignment between the shaft and the housing within a certain angle. Under normal operating conditions, it can tolerate a misalignment angle of approximately 2° - 4°. This self - aligning ability is vital in applications where shaft deflection or misalignment is likely, such as long - shaft machinery, equipment with flexible couplings, or situations with imperfect component installation. By compensating for misalignment, the 1217 bearing reduces stress concentrations in the bearing and connected components, preventing premature failure and improving the overall reliability and durability of the machinery.

3.4 High - Speed Rotation Adaptability

The 1217 self - aligning ball bearing is designed to operate smoothly and efficiently at relatively high speeds. The optimized design of its rolling elements, raceways, and cage, along with proper lubrication, results in low friction and reduced vibration during high - speed rotation. High - quality materials and precise manufacturing ensure the bearing maintains its performance under demanding high - speed conditions. However, like all bearings, its limiting speed is affected by factors such as lubrication type, operating temperature, and load magnitude and nature. In high - speed applications, these factors must be carefully considered to ensure optimal performance and longevity.

IV. Application Fields

4.1 Industrial Machinery

In the industrial sector, the 1217 bearing is widely used in various machinery. In large - scale industrial motors, it provides reliable support for the rotor, effectively managing radial loads during operation. In conveyor systems, it enables smooth conveyor - belt movement by accommodating misalignment caused by uneven installation, thermal expansion, or mechanical vibrations. In industrial gearboxes, it facilitates efficient power transmission while withstanding complex loads from meshing gears. Its self - aligning feature is particularly valuable in industrial applications with common shaft misalignment, improving machinery reliability and efficiency and reducing downtime and maintenance costs.

4.2 Agricultural Machinery

Agricultural machinery often operates in harsh environments with significant vibrations and potential misalignment due to uneven terrain. The 1217 self - aligning ball bearing is well - suited for such applications. For example, in tractors, it can be used in axle support systems to handle heavy loads and misalignment from movement over rough ground. In agricultural equipment like combine harvesters, it supports rotating parts, ensuring smooth operation even with vibrations and shocks during harvesting. Its self - aligning ability minimizes wear and maintenance, making it ideal for agricultural machinery where reliability and durability are essential for maximizing productivity.

4.3 Textile Machinery

Textile machinery requires bearings that operate precisely and smoothly at relatively high speeds. The 1217 bearing is commonly used in spinning frames and looms. In spinning frames, it supports rotating spindles, handling radial loads and compensating for misalignment from high - speed rotation and mechanical vibrations. In looms, it ensures smooth operation of shuttle - moving mechanisms and other rotating parts. Its self - aligning property is crucial for maintaining the accuracy and efficiency of textile machinery, as even minor misalignments can significantly affect textile quality.

4.4 Woodworking Machinery

Woodworking machinery, such as sawmills and wood lathes, often experiences substantial radial loads and vibrations during operation. The 1217 self - aligning ball bearing is well - adapted to these applications. In sawmills, it can be used in saw blade support systems, handling heavy radial forces during cutting and adapting to misalignment from machinery vibrations. In wood lathes, it supports rotating workpieces, enabling smooth and accurate turning operations. Its self - aligning ability prevents premature wear and damage to the bearing and machinery, ensuring long - term reliable operation in the demanding woodworking environment where precision and durability are essential for high - quality wood products.

V. Dimensions and Specification Parameters

VI. Maintenance Points

6.1 Lubrication Management

Proper lubrication is essential for the optimal performance and extended service life of the 1217 bearing. The choice of lubricant depends on operating conditions such as temperature, speed, and load. For general applications, high - quality lithium - based grease is suitable. In high - temperature environments (above 120°C) or under heavy loads, synthetic greases or oil - based lubricants may be more appropriate. The lubricant should be applied in the right amount, usually filling about one - third to one - half of the bearing's internal space. Regular lubrication intervals are determined by operating conditions; in normal conditions, it may be needed every few months, but more frequently in demanding environments. The lubricant should be replenished or replaced promptly to maintain its properties and prevent premature wear.

6.2 Regular Inspection

Regular inspection of the 1217 bearing is necessary to detect early signs of wear, damage, or misalignment. Periodic visual inspections check for cracks, corrosion, or abnormal wear on bearing surfaces. Vibration and temperature monitoring can also detect changes in operating conditions; increased vibration or temperature may indicate issues like improper lubrication, excessive load, or misalignment. If abnormalities are found, the bearing should be thoroughly inspected, possibly by disassembly, and necessary repairs or replacements should be done promptly to prevent further damage.

6.3 Installation Precautions

During installation, a clean working environment is crucial to prevent dust, debris, and contaminants from entering the bearing. Specialized tools should be used to avoid damaging the bearing. The bearing should be installed correctly on the shaft and in the housing with the proper fit. For a cylindrical - bore bearing like the 1217, an interference fit between the inner ring and shaft prevents slippage, with the interference carefully controlled. A clearance fit for the outer ring in the housing allows for self - aligning. Proper alignment with the shaft and housing ensures optimal performance; misalignment during installation can cause uneven loading and premature failure.

6.4 Storage Considerations

When not in use, the 1217 bearing should be stored in a clean, dry, well - ventilated area, protected from moisture, corrosive gases, and extreme temperatures. It should be kept in its original packaging or wrapped in anti - rust paper to prevent rust. Storing horizontally avoids uneven stress on rolling elements and raceways. Regular checks during storage ensure the bearing remains in good condition; if rust or damage is found, appropriate measures like cleaning, re - lubricating, or replacing should be taken before use.