In order to improve the load-bearing capacity and service life of low-speed, heavy-duty, large modulus, multi tooth number and large gear, medium hard tooth surface super large displacement is often used in design. The so-called super large modification gear refers to the gear whose modification coefficient exceeds the conventional...
American Standard ANSI / agma2001 is adopted to calculate the required contact strength, and the calculation formula is as follows: Because the contact stress of the gear under the load spectrum is calculated, SH = 1 and Zn = 1 are selected. According to the standard S-N curve, the...
In the design of American standard gears, steel, Grade2, hrc58-64 (AGMA), case carbonized steel and case hardened gear materials similar to 20mncr5 are also selected. In the American Standard, the contact stress σ hlim = 1551n · mm – 2 is required for the test gear of this material....
1.Calculate the S-N curve of gear The required contact strength is calculated according to ISO / TS 6336-2. Since it is a life calculation, the safety factor shmin = 1 and the life factor ZnT = 1 are taken to obtain the S-N curve in Fig. 1 2.Calculation of...
Put the two standard S-N curves together, the abscissa is the number of stress cycles, the ordinate is the contact stress of gear, and the comparison curve is shown in the figure. According to the S-N curve comparison results of the two standards, the international standard ISO / TS...
In the calculation of the two standards, the calculation service factors of the two factors are involved. In the international standard, Ka is used, and in the American Standard, Ko is used. Because the life under the load spectrum is calculated, Ka = 1 and Ko = 1 can...
20mncr5 hardenability alloy steel, which is commonly used in Europe and China, is selected as the material for tractor gearbox gear design. This material has good hardenability, and can ensure the core hardness and effective hardening depth of the gear after carburizing and quenching. In the international standard ISO...