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The tribological design model is established by the tooth surface contact fatigue strength condition and the lubrication design check formula, and the tribological design model can be obtained. Lubrication conditions: A0154(G0n1)017(cosA)1126(tanAc)1113(uiui1)1113(7dT1ZE2)0113(Ec)-0103d11391E51482[K]R2a1 R2a2(2)(2) Strength condition [1]RHmax=FPL
Example design A pair of spur gear transmissions in a special machine tool headstock. Known: power P1 = 6kW, transmission ratio i = 3, gear asymmetric installation, two shifts, life 3 years, equivalent elastic modulus 1 Ec = 213@1011Pa, environmental viscosity G0 = 107575Pas, pressure-bonding index A = 212 @10-8m2/N, tooth width coefficient Wd=110, pinion material is 45Cr, quenching and tempering treatment, average hardness is HB260; large gear is 45 steel, quenching and tempering treatment, average hardness is HB240. Power machine is stable, working machine There is a medium impact. Level 6 accuracy.
The change of d1 with n1 when the film thickness ratio is K=1 and K=2. 1, 2, and 3 are curves obtained by strength design, lubrication design, and tribology design. The calculation result of the lubrication formula satisfies the strength requirement at low speed, and the strength requirement is not satisfied after n1>1475r/min. The tribological design formula calculates the results to meet both the lubrication requirements and the strength requirements. The safety factor of low and medium speed is large, and the high speed calculation result is slightly larger than the strength result. As K increases the lubrication size, the tribological design formula also increases. The safety factor is larger than when K=1.
Conclusion By comparing the results of the three design methods under various conditions, the following conclusions are drawn: (1) The strength design method does not consider the lubrication requirements, and the results are generally much smaller than the lubrication requirements and less affected by the accuracy level. The tribological design formula calculates the results to meet both the strength requirements and the lubrication requirements.
(2) The design formula of the wiping design is more suitable for the 56th grade and higher precision, and is greatly affected by the precision. The accuracy can be greatly reduced. With 7 levels of accuracy, light loads are suitable for all lubrication conditions. Medium and heavy loads are only available for 1
(4) Problems: This model is not safe at high speed and needs further revision. Not suitable for gear drives up to 8 levels of accuracy.
Discussion on the presupposition of spur gear type gear loss