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Reliability analysis of gears with different support methods The calculation of gear reliability is mainly calculated by the distribution function of gear stress and strength. The commonly used calculation methods have exponential distribution, normal distribution, lognormal distribution and Weibull distribution. And reliability distributions such as distribution. Of course, there are many factors affecting the reliability of the gear, and some factors have a great influence on the reliability. Here, only the reliability comparison of several supporting methods is performed, and the accurate calculation of the gear reliability is not performed. Consult the relevant literature if needed. Here, the reliability and reliability of the gear are calculated and analyzed by using the logarithmic normal distribution method. The equation for calculating the contact fatigue strength is uR1=ln(R)HS/R)H)(C2RHS C2RH)12 The equation for calculating the bending fatigue strength reliability is uR2=ln(R)FS/R)F)(C2RFS C2RF) Reliability calculation of 12311 gear contact fatigue strength (1) Calculating the mean value of contact stress and coefficient of variation The contact stress mean value of gear R)H=ZHZ)EZ)EZ)B]12 In the above calculation formula, three kinds of support methods Each parameter is selected as the same value (the life coefficient is selected according to infinite life). Only the tooth-to-load distribution coefficient is selected due to different support modes, and the calculated results are different; KHB=116532, CKHB=0104 of the cantilever; KHB= of the outer end 113521, CKHB=01013; KHB=112426 at both ends, CKHB=01001. Calculated cantilever: R) H=202411MPa, CRH=010479; outer end: R)H=183015MPa, CRH=010440; both ends: R)H= 175418MPa, CRH=010435.
(2) Calculate the contact fatigue limit mean and coefficient of variation Tooth surface contact fatigue limit mean R)HS=R)HlimZ)NZ)LZ)VZ)RZ)WZ)X The coefficient of variation is CRHS=(C2RH C2ZN C2ZL C2ZV C2ZR C2ZW C2ZX) 12 after calculation: R) HS == 234715MPa, CRHS = 0111758.
(3) Calculating the reliability of tooth surface contact fatigue strength The above calculation data is substituted into the equation for contact fatigue strength calculation: uR1=11167783 for cantilever support; uR1=11981358 for outer end support; uR1=21321037 for support at both ends.
Summarize the analysis of the root bending stress and the tooth surface contact stress under different support modes of the locomotive pinion, and the calculation and comparison of the strength reliability. It can be seen that (1) even if the two ends are symmetrically supported, it is impossible to The contact stress of the gear is evenly distributed on the contact line. This is because the torque is transmitted from one end to the other end, and the gear is an elastic body even if the rigidity is high, so the action load cannot be symmetrically distributed on the contact line of the gear; (2) the gear is changed due to the change of the support mode. The reliability will also change accordingly. The improvement in gear reliability helps to improve the reliability of the transmission system.
Most of the locomotives in China use the cantilever support structure type, and the gear meshing state is not very good. Therefore, the gears are often damaged seriously and the service life is relatively short. To develop a more powerful, more torque locomotive, it is necessary to conduct further research on the meshing state of the gear. As described herein, the improvement of the support type of the gear can improve the meshing state of the gear, greatly reduce the stress of the gear, and improve the reliability of the mechanism.
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The variation of the tooth surface contact stress of the three types of support from the inside to the outside is as follows. From the above analysis, it can be seen that under the same load, different support modes have great influence on the strength of the motor pinion, and also determine the meshing state of the pinion.