Outer ring damage
In most cases the outer ring remains stationary while the inner ring turns. this gives a clearly defined fixed load zone. Most damage occurs in this load zone. if pitting or other surface damage forms, vibrations occur when the roller element Moves over it that can be measured on the housing components.
在大多数情况下，外圈保持静止，而内圈转动。这就形成了一个明确定义的固定荷载区域，大多数损坏发生在该载荷区。如果形成了点蚀或其他表面损伤，则当滚动元件在其上移动时会发生振动，这种振动可以在壳体部件上测量。
failure mode 故障类型 |
frequency in raw signal spectrum 原始信号频谱中的频率 |
frequency in envelope spectrum 包络谱中的频率 |
comment 解释 |
|---|---|---|---|
outer ring damage 外圈损坏 |
(1 x fa) |
1 x fa, 2 x fa, 3 x fa ... |
with advanced damage, the outer ring frequencies can also be seen in the raw signal spectrum 对于晚期损伤, 在原始信号频谱中也可以看到外圈的频率 |
fa |
... frequency of the outer ring damage ... 外圈损坏的频率 |
Inner ring damage
内圈损坏
Any inner ring damage that occurs travels with the rotating shaft. due to the different rotary speeds of the revolving roller elements and the inner ring, pronounced modulations occur. as a result, inner ring damage frequencies are usually shown with sidebands in the spectrum.
发生的任何内圈损坏都会随旋转轴一起移动。由于转辊元件和内圈的旋转速度不同，会产生明显的调制。因此，内圈损伤频率通常用频谱中的边带表示。
failure mode 故障类型 |
frequency in raw signal spectrum 原始信号频谱中的频率 |
frequency in envelope spectrum 包络谱中的频率 |
comment 解释 |
|---|---|---|---|
inner ring damage 内圈损坏 |
(1 x fi) |
i x fi ± i x fn |
inner ring damage generally appears based on modulation with pronounced sidebands for the speed. 内圈损坏一般是基于速度的调制出现的，有明显的边带。 |
fi |
... frequency of the inner ring damage ... 内圈损坏频率 |
fn |
... nominal speed ... 标称速度 |
calculating damage frequencies
计算损坏频率
details of bearing damage frequencies are normally provided by the manufacturer and can be taken from the data sheets for the bearings.
however, they can also be calculated easily. the following values are necessary for this.
轴承损坏频率的详细信息通常由制造商提供，可以从轴承的数据表中获取。
然而，它们也可以很容易地被计算出来。下列数值是必要的。
n |
speed in rpm 速度，单位：rpm |
|---|---|
nb |
number of roller elements 辊子元件的数量 |
d |
diameter of roller elements 滚动元件的直径 |
βc |
pressure angle 压力角 |
d |
roller ring diameter 辊圈直径
|
formula for calculating the inner ring damage frequency
内圈损坏频率的计算公式
fig.: calculation of the inner ring damage frequency
图: 内圈损坏频率的计算
formula for calculating the outer ring damage frequency
外圈损坏频率的计算公式
fig.: calculation of the outer ring damage frequency
图: 外圈损坏频率的计算
fa |
... outer ring damage frequency ... 外圈损坏频率 |
formula for calculating the roller element damage frequency
滚动元件损坏频率的计算公式
damage impacting the individual pitch line:
影响单个节圆的损坏:
fig.: calculating the damage frequency on one roller element
图: 计算一个滚动元件上的损坏频率
few |
... damage frequency of the individual roller element ... 单个滚动元件的损坏频率 |
damage impacting both pitch lines:
影响两个个节圆的损坏:
fig.: calculating the damage frequency on both roller elements
图: 计算两个滚动元件的损坏频率
fw |
... damage frequency of both roller elements ... 两个滚动元件的损坏频率 |
fig.: frequency of failure indicators on roller bearings
图: 滚动轴承的故障指标的频率
for the meaning of individual characteristic values, see characteristic values and configuration.
各个特征值的含义，见 characteristic values 和 configuration。
fig.: frequency of failure indicators on roller bearings
图: 滚动轴承的故障指标的频率
for the meaning of individual characteristic values, see characteristic values and configuration.
各个特征值的含义，见 characteristic values 和 configuration。