Reliability and Random Lifetime Models of Planetary Gear Systems

Table 1

Structural parameters and material parameters.

Parameters	Value	Unit
Pressure angle	20	Degree
Helix angle	0	Degree
Tooth thickness	3	Mm
Density of gears	7.810^3	kg/m^3
Number of teeth of sum gear	36
Number of teeth of planet gear	36
Number of planet gears	3
Modulus	2	mm
Angular velocity of sun gear	60	Degree/second
Elastic modulus	210^5	MPa
Length of a time interval	1	H
m	3
C	10^8	MPa^2
Mean value of total resistance torque	30
Standard deviation of total resistance torque	1.5
Mean value of initial strength of a planet gear	300	MPa
Standard deviation of initial strength of a planet gear	30	MPa
Mean value of initial strength of sun gear	250	MPa
Standard deviation of initial strength of sun gear	30	MPa
Mean value of initial strength of ring gear	250	MPa
Standard deviation of initial strength of ring gear	30	MPa