Method and apparatus for predicting the life of a rolling bearing, rolling bearing selection apparatus using the life prediction apparatus, and storage medium
First Claim
1. A method of using a computer to predict a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable,wherein, when a dynamic equivalent load is P, a load index is p, a viscosity ratio of a lubricant is κ
- , a contamination degree coefficient is ac, a fatigue limit load is Pu, and a life correction coefficient is aNSK, causing the computer to calculate a correction rating life LA of the rolling bearing at a certain reliability coefficient a1 by the following relations;
LA=a1·
aNSK·
(C/P)P
aNSK∝
f[F(κ
), {(P−
Pu)/C}·
1/ac];
wherein a function F(κ
) of the viscosity ratio κ
is set as a lubrication parameter aL, andwherein the life correction coefficient aNSK is calculated on the basis of the lubrication parameter aL and a load parameter {(P−
Pu)/C}·
1/ac.
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Accused Products
Abstract
A dynamic equivalent load P is calculated from data information of a rolling bearing. Next, a reliability coefficient a1 is determined, a lubrication parameter aL corresponding to a used lubricant is calculated, and a contamination degree coefficient ac is determined in consideration of a material coefficient. A fatigue limit load Pu is calculated on the basis of the data information. Thereafter, a load parameter {(P−Pu)/C}·1/ac is calculated. On the basis of the lubrication parameter aL and the load parameter {(P−Pu)/C}·1/ac, a life correction coefficient aNSK is calculated with reference to a life correction coefficient calculation map. The bearing life LA is calculated by LA=a1·aNSK·(C/P)p.
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Citations
27 Claims
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1. A method of using a computer to predict a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable,
wherein, when a dynamic equivalent load is P, a load index is p, a viscosity ratio of a lubricant is κ - , a contamination degree coefficient is ac, a fatigue limit load is Pu, and a life correction coefficient is aNSK, causing the computer to calculate a correction rating life LA of the rolling bearing at a certain reliability coefficient a1 by the following relations;
LA=a1·
aNSK·
(C/P)P
aNSK∝
f[F(κ
), {(P−
Pu)/C}·
1/ac];wherein a function F(κ
) of the viscosity ratio κ
is set as a lubrication parameter aL, andwherein the life correction coefficient aNSK is calculated on the basis of the lubrication parameter aL and a load parameter {(P−
Pu)/C}·
1/ac. - View Dependent Claims (2)
- , a contamination degree coefficient is ac, a fatigue limit load is Pu, and a life correction coefficient is aNSK, causing the computer to calculate a correction rating life LA of the rolling bearing at a certain reliability coefficient a1 by the following relations;
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3. An apparatus for predicting a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable, comprising:
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a data information inputting means for inputting data information including the basic dynamic load rating C and the basic static load rating C0 of said rolling bearing; a dynamic equivalent load calculating means for calculating a dynamic equivalent load on the basis of the data information input by said data information inputting means; a reliability setting means for setting a reliability coefficient; a lubrication parameter calculating means for calculating a lubrication parameter on the basis of the inputting data information; a contamination degree setting means for setting a contamination degree; a fatigue limit load calculating means for calculating a fatigue limit load; a load parameter determining means for determining a load parameter on the basis of the basic dynamic load, the dynamic equivalent load, the fatigue limit load, and the contamination degree coefficient; a life correction coefficient setting means for setting a life correction coefficient on the basis of the lubrication parameter and the load parameter, and a bearing life calculating means for calculating the life of the bearing on the basis of the reliability coefficient the life correction coefficient the basic dynamic load rating;
the dynamic equivalent load, and a load index. - View Dependent Claims (4, 5, 6, 7, 8, 9, 17, 18, 19, 20, 21, 22, 23, 24)
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10. An apparatus for predicting a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable, comprising:
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a data information inputting means for inputting data information including the basic dynamic load rating C and the basic static load rating C0 of said rolling bearing; a dynamic equivalent load calculating means for calculating a dynamic equivalent load on the basis of the data information input by said data information inputting means; a reliability setting means for setting a reliability coefficient; a lubrication parameter calculating means for calculating a lubrication parameter on the basis of the inputting data information; a contamination degree setting means for setting a contamination degree; a fatigue limit load calculating means for calculating a fatigue limit load; a load parameter determining means for determining a load parameter on the basis of the basic dynamic load, the dynamic equivalent load, the fatigue limit load, and the contamination degree coefficient; a life correction coefficient setting means for setting a life correction coefficient on the basis of the lubrication parameter and the load parameter; a bearing life calculating means for calculating the life of the bearing on the basis of the reliability coefficient the life correction coefficient the basic dynamic load rating, the dynamic equivalent load, and a load index; and a recalculation judging means for judging whether, when a calculation result of said bearing life calculating means fails to coincide with a desired life, a recalculation for making the calculation result coincident with the desired life is required or not. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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25. A computer-readable storage medium storing a life prediction computer program product embodied thereon for predicting a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable,
said computer program product comprising code that when executed, causes a computer to perform the following: -
inputting data information including the basic dynamic load rating C and the basic static load rating C0 of said rolling bearing; calculating a dynamic equivalent load on the basis of the data information which is input in said data information inputting step; setting a reliability coefficient; calculating a lubrication parameter on the basis of the data information; setting a contamination degree; calculating a fatigue limit load; determining a load parameter on the basis of the basic dynamic load, the dynamic equivalent load, the fatigue limit load, and the contamination degree; setting a life correction coefficient on the basis of the lubrication parameter and the load parameter; and calculating the life of the bearing on the basis of the reliability coefficient the life correction coefficient the basic dynamic load rating, the dynamic equivalent load, and a load index.
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26. A computer-readable storage medium storing a life prediction computer program product embodied thereon for predicting a life of a rolling bearing having a specification which a basic dynamic load rating C and a basic static load rating C0 are calculable,
said computer program product comprising code that, when executed, causes a computer to perform the following: -
inputting data information including the basic dynamic load rating C and the basic static load rating C0 of said rolling bearing; calculating a dynamic equivalent load on the basis of the data information which is input in said data information inputting step; setting are liability coefficient; calculating a lubrication parameter on the basis of the data information; setting a contamination degree; calculating a fatigue limit load; determining a load parameter on the basis of the basic dynamic load, the dynamic equivalent load, the fatigue limit load, and the contamination degree; setting a life correction coefficient on the basis of the lubrication parameter and the load parameter; calculating the life of the bearing on the basis of the reliability coefficient, the life correction coefficient, the basic dynamic load rating, the dynamic equivalent load, and a load index; and judging whether, when a calculation result of said bearing life fails to coincide with a desired life, a recalculation for making the calculation result coincident with the desired life is required or not. - View Dependent Claims (27)
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Specification