Tooth contact analysis (TCA) is an advanced technology to simulate and analyze the tooth meshing process of gear pair by computer. It can provide the basic criteria for selecting better design parameters and cutting adjustment parameters for gear design and manufacturing. However, since TCA is based on the assumption that the gear teeth are rigid and there is only one pair of gear teeth in contact at any time, the analysis results are usually only applicable to light load conditions.

Tooth loaded contact analysis (LTCA) is based on breaking the rigid hypothesis and single tooth meshing hypothesis in tooth contact analysis. It can reveal the meshing mechanism of gear pair during loading movement. Because the contact analysis of loaded tooth surface is carried out in dynamic elastic state, and the effects of various deformations are considered. Therefore, tooth loaded contact analysis (LTCA) can accurately reflect the meshing state and loading meshing mechanism in the process of power transmission.

In the meshing contact analysis of gear loaded tooth surface, the meshing at any time during the meshing process of gear under load state shall meet the following conditions:

a. Basic equation of gear transmission

b. Working tooth surface constraints

c. Gear motion coordination condition

d. Force balance condition