The research on the load carrying capacity of the point-line meshing gear is similar to that of the involute gear, mainly including three aspects of the tooth surface contact strength, the tooth root bending strength, and the gear bonding strength. However, because its meshing principle is different from that of the involute gear, its load carrying capacity analysis method is different from that of the involute gear. The following will analyze the current situation of the research on the strength checking and calculation method of the point-line meshing gear, as detailed below.
In terms of contact strength of tooth surface, the point-line meshing gear is superior to the involute gear, which is mainly determined by the meshing characteristics of the two types of gears. Domestic scholars have studied the contact strength checking method of the point-line meshing gear. According to the characteristics of the point-line meshing gear transmission, Huang Hai and others have carried out the analysis and calculation of the maximum contact stress position in the process of the point-line meshing gear transmission, The calculation formula of maximum contact stress is deduced by using Hertz theory, which provides theoretical basis for checking the contact strength of this type of gear. At the same time, referring to the calculation method of contact static strength of involute cylindrical gear, the calculation method of contact static strength of point-line meshing gear is proposed, which provides theoretical basis for checking the contact strength of point-line meshing gear and checking the instantaneous overload strength.
In terms of tooth root bending strength, the point-line meshing gear is also superior to the involute gear. Luo Qihan and others developed the ANSYS finite element software for the second time, made a finite element analysis process for accurately calculating the tooth root bending strength, and used this process to accurately calculate the bending strength of the involute gear and the point-line meshing gear with the same parameters, It is concluded that the bending strength of point-line meshing gear is 11.7% higher than that of involute gear. In order to further improve the design efficiency of the point-line meshing gear, Huang Hai and others established the optimization mathematical model with the maximum safety factor of the actual bending fatigue strength of the point-line meshing gear as the optimization objective, and carried out the parameter optimization design research by using the multiplier method. The research results have certain help to improve the design efficiency.
In terms of gear bonding strength, Huang Hai and others have carried out research on the calculation methods of hot and cold bonding of point-line meshing gears, in which the hot bonding of gears is carried out by the integral temperature method, and the cold bonding is carried out by the method of oil film thickness ratio. Relevant calculation formulas are derived, and the calculation method of bonding strength safety coefficient is given, which provides help for the evaluation of the bonding strength of point-line meshing gears.
To sum up, the current theoretical research framework for the strength verification of point-line meshing gears has been basically established, and a certain degree of research has been carried out in the aspects of contact strength, bending strength, and bonding strength. Although its research results can basically evaluate the reliability of point-line meshing gears, it lacks sufficient test data support, so it is necessary to increase the research efforts in the reliability test verification of bearing capacity, and verify the data through tests, Further improve the strength checking theory of point-line meshing gear.