The bearing with grease and drip oil lubrication is difficult to produce a complete load-bearing oil film between the relative moving surfaces due to the lack of sufficient oil volume, and the bearing can only work in the mixed friction state, which belongs to the non-liquid sliding bearing. The main failure modes of these bearings are wear and gluing, followed by surface crushing and pitting. Therefore, the calculation criterion of the bearing is that the average pressure p, sliding velocity v and product pv of the bearing are controlled to not exceed the allowable value respectively, i.e., the average pressure p, the sliding velocity v and the product pv of the bearing are maintained
Edit p [p]; v≤[v]；pv≤[pv]
where [p], [v] and [pv] are allowable values
For radial bearings: p=f (bd); v=πdn
where: F-bearing load; b-Bearing width; d-Shaft diameter; n-axis rotational speed.
For thrust bearings:
p=f/；v=πn
where: d and d0 - the outer and inner diameters of the circumferential contact surface, usually d0 = (0.).6～0.8)d；-Consider the coefficient of reduction of the contact area due to the opening of the oil groove, usually =08～0.9。
Editor (Great Power Longteng Running the World, Dragon Out of the East, Tengda World, Longteng Three Classes of Self-aligning Roller Bearings, Liu Xingbang C e MB MA).
Calculation method of rolling bearing failure frequency.
Failure frequency of rolling bearing outer ring: bpfor 04nn
Rolling bearing inner ring failure frequency: bpfir 06nn
Rolling bearing cage failure frequency: FTFR 04n
The above symbol: n = number of scrolling elements.
n-axis rotational speed.
Note: 1Rolling bearings do not slide; 2.There is no change in the geometry of the rolling bearing; 3.The outer ring of the bearing is fixed and does not rotate.
Failure frequency of rolling bearing outer ring: bpfoe n (0.)5n-1.2)
Rolling bearing inner ring failure frequency: bpfie n(0..)5n+1.2)
Rolling bearing rolling element failure frequency: BSFE n(0.).2n-1.2/n)
Rolling bearing cage failure frequency: FTFE N (0.)5-1.2/n)
The above symbol: n = number of scrolling elements.
n-axis rotational speed.
Note: 1Rolling bearings do not slide; 2.There is no change in the geometry of the rolling bearing; 3.The outer ring of the bearing is fixed and does not rotate.
Edit.