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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 essential to ensure that it meets the required performance standards and is the optimal choice for the application. This requires further inspection or verification. Understanding the load and stress conditions on the relevant components during operation is a crucial step in this process.
In practice, when the device operates with proper lubrication and sealing, and under normal working conditions, most NTN bearings experience rolling motion where the rolling elements move along the raceway. As a result, varying contact stresses occur on the surfaces of the interacting parts. After a certain number of cycles, these stresses can lead to the formation of micro-cracks beneath the surface layer. These cracks may develop as the lubricating oil penetrates the gaps. Under excessive static or impact loads, plastic deformation pits can appear on the rolling elements or raceways. This issue typically occurs in bearings operating at very low speeds or with oscillatory motion.
If the NTN bearing has poor sealing and works in dusty environments, abrasive particles can enter and cause wear. Between the rolling elements and the raceway, especially between the rolling elements and the cage, if there is insufficient lubrication, heat buildup can occur. This may lead to tempering of the rolling elements, and even adhesive wear. The higher the rotational speed, the more severe the wear becomes. Additionally, abnormal equipment operation, improper disassembly, or incorrect installation can also damage the bearing components. These issues should be avoided to maintain the bearing’s performance and longevity.
The purpose of the inspection is primarily to prevent bearing failure and ensure the NTN bearing functions properly within its expected service life. Different working conditions lead to different main failure modes. For bearings operating at medium speeds, the primary failure mode is fatigue pitting. To ensure a satisfactory fatigue life, the bearing must be checked according to its calculated fatigue life. For high-speed bearings, due to increased heat generation, frequent wear and burning are common. In addition to checking the fatigue life, it is important to verify that the bearing does not exceed its limit speed. For bearings operating at very low speeds or without rotation, the main failure mode is excessive plastic deformation. In such cases, a static strength check is necessary to avoid overloading.
To ensure the reliability and durability of NTN bearings, regular maintenance, proper lubrication, and correct installation are all critical factors. Understanding the load and stress dynamics during operation helps in making informed decisions about bearing selection and maintenance practices.
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This article is sourced from China Bearing Network.
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