Both the gear ratio and the number of gear teeth have the same gear ratio range, and most of the gears have the same number of teeth. When the transmission ratio of the involute less tooth difference transmission is less than 30, the two-tooth difference transmission and the three-tooth difference transmission are used, and the cycloidal pinion transmission uses the two-tooth difference transmission when the transmission ratio is less than 17.
The structure of the whole machine is different except that the gear profile of the gear is different, and other main mechanisms (such as the output mechanism) are the same. This is advantageous for the development of the transmission tolerance and the return tolerance of the cycloidal pinion planetary transmission reducer. (4) Performance of the reducer No matter which gear profile is used, the speed reducer is not only good or bad in terms of performance, but also the tolerance of the cycloidal gear can be referred to the involute gear tolerance. the most important reason.
Principles for the definition of the tolerance of the cycloidal gear and the selection method of the tolerances In the GB100951988 standard, the involute gear tolerance is checked by the index circle diameter and the modulus, and the index circle diameter and modulus are determined according to the fatigue strength formula. Since the involute less tooth difference planetary gear transmission is an internal mesh transmission, the calculation is mainly based on the bending fatigue strength formula. Considering the increase in the degree of coincidence after the gear is loaded, the coincidence coefficient k is added to the formula.
d13kkbkTvz1yfaysad[]F(1) where the index circle diameter (mm) k load factor (the product of the dynamic load coefficient, etc.) of the d1 planetary gear is generally taken as the load unevenness coefficient between the 1315 kb planetary gears, and the 10511k coincidence coefficient is taken. 054075Tv output shaft torque (Nmm) z1 planetary gear number yfa tooth profile coefficient ysa stress correction coefficient d tooth width coefficient, take 0204 [] F allowable bending strength, for 40Cr steel quenching, 435MPa or so cycloidal pinion planetary transmission deceleration The design parameters of the device include the number of teeth of the needle wheel zb, the number of teeth of the cycloidal wheel za, the diameter of the needle wheel Dz, the diameter of the needle tooth dz, the coefficient of the short axis k1, the diameter coefficient of the needle diameter k2 and the like. The contact fatigue strength calculation formula of the needle wheel diameter has the following two [4] Dz13308ETvy1maxB[]2j(2) or Dz231231ETvy2maxB[]2j(3).
Tolerance selection method The steps of tolerance selection are as follows: design the cycloidal pinion planetary transmission reducer, the transmission ratio i and za, Dz, dz, k1 and D1 values; according to the transmission ratio i value and the equivalent involute gear The number of teeth z1 (the parameters in the parameters are all equivalent involute gear parameters); according to the value of y2max selected; the modulus md of the equivalent involute gear is calculated by (7) and adjusted to the standard modulus m; For the indexing circle diameter d1 and the modulus m value of the involute gear, look up the relevant tolerance value table of the involute gear to obtain the corresponding tolerance value of the cycloidal gear.
Conclusions (1) The definition of the precision level of the cycloidal gear can be determined by analogy. The basic accuracy of the cycloidal gear is determined by instrument testing and effect analysis. (2) Develop the Cycloidal Gear Accuracy Project and its tolerances, mainly considering the performance of the gears. Through the comparison of various characteristics of the involute planetary gear reducer and the cycloidal pinion planetary gear reducer, it can be explained that the involute gear tolerance can be borrowed when selecting the cycloid gear tolerance.
Flexible Fuel Tanks,Flexible Water Tank,Bulk Liquid Flexible Tank,Flexible Tank
Tongshuai Vehicle Components Co., Ltd. , http://www.brandflexitank.com