Gear transmission plays a very important role in modern industry. It has the characteristics of high efficiency, compact structure and high transmission accuracy, so it is widely used in the field of mechanical transmission. Straight gear, helical gear and herringbone gear are the most common gear drives. Due to structural reasons, the above cylindrical gears have certain disadvantages, such as the limited bearing capacity of involute straight gear, the axial force of helical gear and the complex processing of herringbone gear.
In recent years, some scholars at home and abroad have also studied circular tooth profile cylindrical gears. Wang Hong and others have used ANSYS to carry out dynamic analysis of gears; Ma Tengqiu studied the distribution of impact contact stress at different positions of gears; ZHANG XG et al. studied the contact line of cylindrical gears with circular tooth profile, and the contact stress and bending stress of gears. CHEN Y C et al. deduced the mathematical model of the tooth surface and studied its transmission error, etc. The research results show that the gear has the advantages of large coincidence, good contact lubrication, no axial force, low noise, good meshing performance, high efficiency, etc. Compared with spur gear transmission, it has poor stability, easy to produce impact, vibration and noise problems, and helical gear has axial force, herringbone gear processing is complicated, etc, This gear can be used instead in most applications.
(1) Through the analysis of the machining principle and tooth surface equation of the circular tooth profile cylindrical gear pair, the accurate model of the circular tooth profile cylindrical gear is obtained by using the modeling software SolidWorks and the analysis software Matlab, which provides the relevant basis for the subsequent analysis.
(2) In theory, the contact stress of the gear tooth surface decreases with the increase of the tooth width coefficient, but the greater the better Φ When a is greater than 0.6, the volume of air in the tooth slot will change greatly, and the air will be pressed out quickly during the meshing process, resulting in increased noise. Moreover, with the increase of the tooth width, the load distribution along the tooth width will be more uneven, which is easy to cause the phenomenon of partial load and stress concentration, and the actual bearing capacity of the gear wheel will be reduced.
(3) In the circular arc tooth line cylindrical gear pair with modulus m=4, number of teeth z1=20, z2=30, the bearing capacity of the gear is the best when the tooth line radius of the gear is 1.5b ≤ R ≤ 2.5b. Under the condition that other relevant parameters of the gear remain unchanged, with the increase of the tooth line radius, the overall contact stress shows a trend of decreasing first and then increasing. Finally, when the tooth line radius of the gear increases to infinity, the result is similar to that of the spur gear. The conclusion of the study provides a theoretical basis for the future engineering application and design of circular tooth profile cylindrical gears.
In order to solve the structural defects of the cylindrical gear mentioned above, ZHY Gear analyzed a new type of gear transmission – circular tooth line cylindrical gear. The main feature of circular tooth profile cylindrical gear is that its tooth profile is a space curve. The tooth profile of circular tooth profile cylindrical gear can be either involute or Novikov arc curve. Through analysis, it is concluded that the gear, as a basic mechanical part in the field of mechanical transmission, has a very broad application prospect.