How to calculate linear ball bushing life (and how it differs from other life calculations)

The standard线性滚珠轴承的生活计算被广泛称为：

L = bearing life (m)

C = rated dynamic load (N)

F = applied dynamic load (N)

但是线性球衬套通常会经历一般轴承寿命方程中未考虑的操作条件。为了解决这些不利条件，线性球衬套的寿命计算包括许多校正因素，以相应地调整轴承寿命。

Here, we’ll look at each of these correction factors and explain how and when to use them.

负载方向

The first correction factor (K_θ) accounts for the orientation of the load relative to the ball tracks, or circuits, in the linear bushing. When a load is applied to a linear bushing assembly, the orientation of the bushing on the shaft and the direction of loading determine whether the load is carried by just one ball track or shared between two or more tracks.

To account for this variability, manufacturers offer charts or polar graphs that provide load correction factors depending on the orientation of the load relative to the orientation of the ball tracks.

Unlike other correction factors, the load correction factor can be greater than 1.0 in some cases, meaning that a specific load-bushing orientation provides a dynamic load capacity that is higher than the published value.

轴硬度

在最近的一篇文章中，我们研究了轴硬度可以影响线性衬套组件的寿命。制造商通常建议与线性球衬套一起使用的轴的硬度为58至60 hrc。如果轴硬度低于建议，则轴硬度因子（K_S) must be applied to de-rate the bearing’s dynamic load capacity, and in turn, the bearing’s expected life.

温度

非常高的工作温度会影响组成衬套的组件的完整性（例如密封板和负载板），并且还可以减少轴硬度。温度校正因子（K_T) takes into account this degradation in material and typically comes into play for operating temperatures above 100° C.

Short stroke

当线性球衬套的笔触非常短 - 根据制造商和轴承类型，衬套长度的1.5至3倍时，该应用通常被认为是“短程”应用程序。在这种情况下，轴可能会遇到加速的磨损和过早故障，因为轴的一小部分必须不断承受载荷球造成的力和压力。短程因素（K_C）考虑到这一点，并相应地降低了轴承寿命。

生活因素

The bearing life equation determines the expected life of linear ball bushing for a given dynamic load capacity and applied dynamic load. But in some cases, the desired bearing life and the applied load are known, and the parameter to be calculated is the required dynamic load capacity of the bushing that will provide the specified bearing life under the given load. In this case, the required dynamic load capacity (C_R) is calculated as follows:

但是请回想一下，线性球衬套的轴承寿命基于100,000 m（或200万英寸的英寸产品）。如果所需的轴承寿命大于100,000 m（或200万英寸），则必须将施加的负载除以生命因素（K_L）为了说明寿命更长的寿命。

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如果您要处理度量线性球衬套，请不要忘记检查轴承的额定值50,000 m还是100,000 m，并应用适当的轴承correction factor在具有不同寿命等级的轴承之间进行比较时。

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Filed Under:线性运动Tips

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