# Research on contact degree and unit contact line load based on helical gear

Helical gear is widely used in high-speed and heavy-duty transmission because of its smooth transmission, strong bearing capacity, low noise, weak impact and vibration. With the helical gear used in high speed and heavy load, the research on contact line load of helical gear is more and more urgent.

At present, many scholars have carried out research on helical gears. Through the research on the contact line length of helical gear, Feng Guanwei obtained the change rule of contact line length. Sun Zhijin et al. Obtained the change diagram of the helical gear’s meshing line by studying the actual engagement of the contact line of the helical gear. Lu Fengxia established the contact analysis model of helical gear, established the solution and load balance equation, and calculated a group of load distribution on the tooth surface.

Although many scholars have carried out the research on the load distribution of helical gear, the research on the unit contact line load of helical gear is still less. Therefore, this paper focuses on the calculation of the contact line length of helical gear, and finally determines the unit contact line load and contact degree of helical gear in actual meshing Contact line length relationship.

① Based on the meshing process of gears, this paper studies the coincidence degree, length of meshing line and unit contact line load at the meshing point of helical gear. The analysis shows that the coincidence degree of helical gear is different from that of spur gear, so it is necessary to consider not only the contact degree of end face, but also the degree of reconnection of shaft surface.

② The total coincidence degree of helical gear is closely related to the contact line length of helical gear: the greater the total coincidence degree of helical gear and the longer the contact line length, the better the bearing performance of helical gear and the more stable transmission.

③ The unit load on the contact line of helical gear is related to the total contact line length of helical gear: under the condition of constant total normal load, the longer the total contact line length is, the smaller the unit line load on the contact line of helical gear is, which improves the bearing capacity of helical gear.

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