SKF 6206-2Z/VA208 bearing

The relationship between modal displacement and modal strain and the degree of cracks in the outer ring is analyzed separately, and the sensitivity of modal displacement and modal strain to crack damage is compared. Because there must be a corresponding strain mode corresponding to each displacement mode, they are two manifestations of the same energy balance state and their proportions are the same. Here, the sensitivity of modal displacement and modal strain to crack damage is compared by comparing the maximum modal displacement and the maximum modal strain. When the crack depth is less than 4.5mm, the displacement mode increases with the degree of damage, but the change is small; the modal displacement begins to decrease; the modal displacements of other orders do not change much with the increase of the crack depth; the modal displacements of each order After the fracture, they all increased significantly. When the structure is damaged, the displacement mode changes greatly when the crack position is at the mode node position.

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For bearings deployed in the agriculture sector there is no shortage of potential hazards, including moisture, soil dust, corrosive fertilisers and very high shock loads (such as those generated by stone chipping). However, the robust bearing design and highly effective sealing of NSK Agri Disc Hubs makes them a proven choice in extreme operating conditions. Manufactured in Germany, these innovative units are a popular choice for common farming implements such as short disc harrows, seed drills and flail mowers.Extremely harsh working conditions, along with high-pressure washing routines, place a raft of demands on the bearings and seals found in equipment for the agriculture industry. A low-quality bearing will not be sufficiently robust in its design or performance levels to provide the uptime necessary for reliable and productive operation. Instead, frequent downtime and costly failures will be the likely result.

NSK’s solution to this challenge is the Agri Disc Hub, a cost-effective, self-lubricating bearing unit that delivers a number of major benefits to users of farming implements. High-performance Agri Disc Hubs feature double-row angular-contact ball bearings that can support high axial and radial loads, while the meticulously devised configuration locates the bearings within a sturdy housing that connects directly (and simply) to the implement via an integrated flange.

Importantly, NSK can offer fast, Europe-wide availability of Agri Disc Hubs as manufacturing takes place in Germany. The Munderkingen facility can boast almost 70 years of high-quality production output.
Alongside high-performance bearing technology, Agri Disc hubs are equipped with a highly effective sealing system for robust protection against extreme condition applications. This comprehensive system is a combination of labyrinth and contact seal designs, which serves to prevent both the ingress of contaminants and the escape of grease. ‘Greased for life’ Agri Disc Hub bearings provide users with maintenance-free operation.

The innovative design of the bearings and sealing system significantly increases service life. Even under extreme stress, Agri Disc Hub bearings – and thus the implement which they serve – grant a service life that is several times beyond that of other commercially available solutions, while their modularity means they can be adapted very quickly to individual user requirements. In such instances, flexible manufacturing at the Munderkingen plant ensures rapid deliveries at competitive costs, even more so for custom requests.

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　　Whether the NSK bearing is installed correctly will directly affect the accuracy, life and performance of the bearing during use.

　　(1) When cleaning a large number of NSK bearings, first use hot machine oil at a temperature of 90～100℃ to melt the encapsulating oil. At the same time, use a seamless and chip-free tool to dig out all the old oil, and then blanch it for a few minutes. Then rinse with kerosene to remove the engine oil, and finally clean it again with gasoline. After cleaning, wear film gloves and place the NSK bearing on a clean cloth or paper on the workbench to dry.
　　(2) Before the NSK bearing is installed, you should use appropriate measuring tools to check the machining quality of the shaft, seat hole and related parts (such as dimensional accuracy, shape accuracy, surface roughness, etc.) according to the technical requirements on the design drawings.
　　(3) Open the NSK bearing package before installation, immerse it in the above-mentioned gasoline and other liquids and rotate it gently by hand to ensure that the cage, rolling elements and the sealing oil on the surface of the raceway are thoroughly cleaned.
　　(4) The assembly surface should be cleaned with clean gasoline, kerosene, toluene or xylene and other solutions, and dried with a clean cloth, and then coated with a thin layer of lubricating oil, which will make the installation and operation more convenient.
　　(5) Note that NSK bearings with seals cannot be cleaned by this method, and the inside of the seal should be kept intact and cannot be cleaned.
　　(6) If there are bumps, burrs, rust spots or solid particles (such as abrasive debris, sand, mud) on the assembly surface of the shaft and the bearing seat hole, it will not only make the installation of the NSK bearing difficult and make the installation position incorrect, but also If solid particles fall into the NSK bearing, it will have a grinding effect. When the NSK bearing rotates, it will scratch or scratch the working surface of the NSK bearing. Therefore, it must be carefully checked before installation. If the above defects are found, they should be corrected. . For example, use an oil file to remove burrs, raised bumps, and rust spots, and polish with a fine emery cloth. Another example is to clean solid particles and dirt.

FAG QJ226N2 bearing

Content Applicable Bearing Type

Fixed-end bearing: used to locate and fix the bearing axially. Select bearings that can bear radial and axial loads at the same time. In order to withstand the bidirectional axial load, it is necessary to consider the corresponding strength according to the size of the axial load during installation. Deep groove ball bearing combined angular contact ball bearing, double row angular contact ball bearing, self-aligning ball bearing, cylindrical with rib, roller bearing (NUP type, NH type), double row roller

Spherical roller bearings

Free end bearing: used to avoid the expansion and contraction of the shaft caused by temperature changes during operation, and to adjust the axial position of the bearing. It is advisable to choose a bearing that only bears radial load and the inner ring and outer ring can be separated. When using non-separable bearings, a clearance fit is generally adopted between the outer ring and the housing, so that the shaft can be extended and retracted together with the bearing for axial avoidance. Used to avoid the temperature during operation.

The expansion and contraction of the shaft caused by the change and the adjustment of the axial position of the bearing. It is advisable to select a bearing that only bears radial load and the inner ring and outer ring can be separated. When using non-separable bearings, a clearance fit is generally adopted between the outer ring and the housing, so that the shaft can be extended and retracted together with the bearing for axial avoidance. When the fixed end and the free end are not distinguished, when the bearing spacing is small and the influence of shaft expansion and contraction is not large, it will be able to two angular contact ball bearings or tapered roller bearings that can bear axial load are configured on the front or back.

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Question 1:How to choose grease?

Lubrication has a very important effect on the operation and life of INA bearings. Here is a brief introduction to the general principles of grease selection. Lubricating grease is made of base oil, thickener and additives. The performance of different types and different types of lubricating grease of the same type is very different. The allowable rotation limit is different. Please pay attention when choosing. The performance of the grease is mainly determined by the base oil. Generally, low viscosity base oil is suitable for low temperature and high speed, and high viscosity is suitable for high temperature and high load. Thickener is also related to lubricating performance. The water resistance of the thickener determines the water resistance of the grease. In principle, greases of different brands cannot be mixed, and even greases of the same thickener can have bad effects on each other due to different additives.

Question 2:Must the bearings be cleaned before installation? 　

The bearing surface is coated with anti-rust oil, you must carefully clean with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature lubricating grease before installation and use. The effect of cleanliness on rolling bearing life and vibration noise is very large. But we have to remind you in particular that the fully enclosed bearings do not need to be cleaned and refueled.

Question 3:How to install and disassemble?

Do not directly hammer the INA bearing end face and non-stressed surface during installation. Use a pressure block, sleeve or other installation tools (tooling) to make the bearing evenly stressed, and do not install it through the driving force of the rolling element. If the installation surface is coated with lubricating oil, the installation will be smoother. If the interference is large, the bearing should be placed in mineral oil and heated to 80~90℃ as soon as possible. The oil temperature should be strictly controlled not to exceed 100℃ to prevent the tempering effect from reducing the hardness and affecting the size recovery. When it is difficult to disassemble, it is recommended that you use the disassembly tool to pull out and carefully spray hot oil on the inner ring. The heat will expand the inner ring of the rolling bearing, making it easier to fall off.