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Load and stress changes on components during NTN bearing operation
**Load and Stress Changes on Components During NTN Bearing Operation**
Home > Bearing Knowledge > Load and Stress Changes on Components During NTN Bearing Operation
Source: Bearing Network | Time: June 19, 2014
When selecting an NTN bearing, it's crucial to evaluate whether the chosen component meets the required performance standards and whether it represents the best possible solution. This evaluation should be carried out through further inspection or testing. Understanding the load and stress conditions that components experience during operation is essential for accurate analysis and decision-making.
In practice, when the device maintains proper smoothness and sealing, and the operating conditions are normal, most NTN bearings function by allowing the rolling elements to move along the raceway. As a result, contact stress occurs at the surfaces in contact between the rolling elements and the raceway. After a certain number of cycles, this stress can lead to the formation of microscopic cracks beneath the surface. These cracks may propagate as lubricating oil enters the gaps, eventually causing fatigue failure.
Under excessive static or impact loads, plastic deformation pits may appear on the rolling elements or raceway. This issue is commonly seen in bearings operating at very low speeds or with oscillating motion. Poor sealing in NTN bearings, especially in dusty environments, can allow abrasive particles to enter, leading to increased wear. If the interaction between the rolling elements and the raceway is not smooth, and if heat buildup becomes severe, it may cause tempering of the material, resulting in scuffing or adhesive wear. The higher the rotational speed, the more severe this type of wear tends to be.
Other factors such as abnormal equipment operation, improper disassembly, or incorrect installation can also lead to damage to NTN bearing components. It’s important to avoid these issues to ensure the bearing operates smoothly and reliably.
The purpose of conducting a reliability check is to prevent bearing failure and ensure that the NTN bearing performs as expected over its intended service life. Different working conditions can lead to various failure modes. For bearings operating at medium speeds, the primary failure mode is usually fatigue pitting. In such cases, ensuring a satisfactory fatigue life is critical, and the bearing should be checked based on its expected life.
For high-speed bearings, heat generation is a major concern, often leading to excessive wear and burning. In addition to checking the fatigue life, it's also necessary to verify that the bearing does not exceed its maximum allowable speed. Bearings operating at very low speeds or with no rotation may suffer from excessive plastic deformation. To prevent this, a static strength check is required.
To maintain the performance and longevity of NTN bearings, regular maintenance, proper lubrication, and adherence to operating guidelines are essential. Understanding the stresses and loads acting on each component helps engineers make informed decisions and improve system reliability.
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