Backyard Hot Tub Spa,Inground Spa,6 Person Hot Tub Spa,Whirlpool Bath Tub SpaRelax Co., Ltd. , https://www.sparelaxoutdoorspa.comPreloading Methods for Rolling Bearings
Preloading is an essential technique used in rolling bearings to improve their performance, reduce play, and increase stiffness. It can be categorized into two main types: radial preloading and axial preloading. Each method has its own application scenarios and advantages.
**1. Radial Preloading Method**
Radial preloading is commonly used in tapered bore bearings that are subjected to radial loads. For example, it is often applied to double-row short cylindrical roller bearings. This method involves adjusting the position of the bearing relative to the tapered shaft using nuts or similar devices. By doing so, the inner ring expands slightly, creating a radial negative clearance. This technique is widely used in high-precision applications such as machine tool spindles and jet engines where minimal play and high rigidity are required.
**2. Axial Preloading Method**
Axial preloading is further divided into two types: positioning preloading and constant pressure preloading.
- **Positioning Preloading**: In this method, the preloading force is adjusted by modifying the thickness of bushings or shims. The appropriate preload can be achieved either by measuring the starting friction torque or through precise control. This type of preloading is typically set once during installation and does not require frequent adjustments. However, it is important that the axial orientation of the bearing remains fixed during operation to maintain the desired preload.
- **Constant Pressure Preloading**: This method uses springs, such as spiral or disc springs, to apply a consistent preloading force. The spring's stiffness is much lower than that of the bearing, allowing for some axial movement without significant changes in the preload. As a result, this method is ideal for applications where slight movements are expected due to thermal expansion or load variations.
**Comparison Between Positioning and Constant Pressure Preloading**
- When the preloading amount is consistent, positioning preloading provides better stiffness and has a smaller impact on the bearing's load capacity.
- During operation, positioning preloading may experience changes due to temperature differences, radial expansion, or load displacement. In contrast, constant pressure preloading maintains a nearly constant preload, making it more suitable for dynamic environments.
It is important to note that the choice of preloading method depends on the specific application requirements, including precision, operating conditions, and maintenance considerations.
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Preloading method for rolling bearings
Source: China Bearing Network | Date: October 21, 2013