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LYC cylindrical roller bearing features
Source: Bearing network time: 2013-04-10
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According to the following assumed conditions; able to account for the satisfactory and accurate response of the axial load type Fmax-maximum axial load; KN
C0- fundamental static load rating; KN
Fr - practice radial bearing load; KN
n - speed; r/min
d(D)- bearing inner (outer) diameter; L
K1 - coefficient; 1.5 when the oil is smooth; 0. 5 when the grease is smooth
K2 - coefficient; 1.5 when the oil is smooth; 0.15 when the grease is smooth
The above formula is based on the temperature difference between the bearing operating temperature and the ambient temperature of 60 ° C; the viscosity ratio is greater than or equal to 2 conditions.
The requirement is that the cylindrical roller bearing not specifically drawn by the roller end face and the rib is not suitable for the above formula.
In order to prevent cracking of the rib; the effect is fixed on the bearing or accidental axial load Fa; LYC technical department does not claim to be greater than the following values:
Scale 2 series bearing; Fa < 0. 0045D1. 5 (D is the bearing outer diameter L) KN
Other scale series bearings; Fa < 0. 0023 D1. 7 (D is the bearing outer diameter L) KN
The axial load Fa for short or accidental effects; does not claim to be greater than the following values:
Fa=0.007 D1. 7 (D is the bearing outer diameter L) KN
When a single row cylindrical roller bearing receives a large axial load; the rib should receive a uniform load and reach a certain rotation accuracy; the size and axial runout of the shoulder must be satisfied with the necessary requirements. The accuracy of the beating can be seen in the general content of some "bearing applications". The diameter of the shoulder of the block (hole) (see Figure 1); the LYC technical department on the side without the rib on the inner ring claims that the height is half of the height of the rib; To prevent the rib from receiving the cyclic stress; the side of the inner ring with the rib; the diameter of the shoulder can use the following formula to calculate the diameter of the shoulder:
Da = 0. 5 (d1+F)
Where da - shoulder diameter; L
D1 - inner ring rim diameter; L
F - inner ring raceway diameter; L
When the axial point error of the inner ring and the outer ring exceeds 1'; the condition of receiving the load on the rib will cause a big change. The safety factor in the above reference value can not be applied. When this situation occurs; LYC technical department for consultation.
In order to ensure that the cylindrical roller bearing receives axial load; especially when accepting large axial load, it can still work normally; LYC technical department prompts to pay attention to the following points:
1) The radial clearance of the bearing should be controlled within the required range; and should be small and should not be large.
2) Select a smoothing agent containing extreme pressure additives.
Minimum load in order to ensure the bearing to achieve outstanding working conditions; single row cylindrical roller bearings are the same as other ball bearings and roller bearings; it is necessary to apply a certain minimum load; especially for high speed, high acceleration; or frequent changes in the load direction Under the conditions of operation; due to; these conditions; the inertia of the roller and the cage and the conflict in the smoothing agent will have an adverse effect on the rolling and rotation accuracy of the bearing; there can be between the roller and the raceway Sliding movement that is harmful to the bearing.
The minimum load Fmin required for a single row cylindrical roller bearing can be budgeted using the following formula:
Where n - operating speed; r / min
Limit speed of nr-(0. 8~0. 9); r/min
Dm - bearing uniform diameter dm = 0.5 (d + D), mm
Kr - minimum load factor; its value is shown in the table below.
Size series Kr 10 2, 3, 4 22 23
100 150 200 250
In the case of low temperature conditions or high viscosity of the smoothing agent; can require a greater minimum load. Under normal conditions; the bearing support itself and the load accepted by the bearing; now exceeds the minimum required load. If the minimum load is not reached; it is necessary to apply the rated radial load for this type of bearing; to meet the minimum load requirement.
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