The Loaded Tooth Contact Analysis And Bending Stress And Contact Stress Calculating Method Research Of Face Gear Drive With Spur Involute Pinion

High precision Face-gear is applied in transmission system of aerospace, and its operating life is affected by the contact and bending strength seriously, which decides its design parameters. The stability and noise of face-gear drive, is related to the transmission performances, such as contact ratio, transmission error and distribution factor of load. So these researches are very important to the design of face-gear drive. Geometric modeling, contact characteristics, computation for contact stresses, strength and transmission performances are studied. These works are significant to practical application and design work for face gear.The main contents and achievements of the research works are consist of the follows as below:1. Based on the meshing theory of face-gear drive, the tooth surface equation is deduced, which is solved with a numerical method. The contact trace is got, according to the continuous tangency condition, and its offsets along the tooth width are studied. These results are expressed in a Matlab figure file. Geometric models are constructed by the NURBS surface or virtual manufacturing, then the fitting errors are studied.2. Two methods of computing the contact stresses are given, which are analytic one and finite element analysis. The analytic method is based on "Hertz contact theory", and the principal curvature and its principal direction are known, then the contact stresses and deformations of the meshing points are obtained. The FEA program ABAQUS is used to calculate the contact stresses and contact areas of single tooth for face gear drive, in which the loaded tooth contact simulation are performed.It turns out that:Without regard to edge contact, both of them are reliable, and their relative errors are small than10%. In terms of edge contact, the previous one comes to failure, while the latter shows the stress concentration correctly.3. The muti-tooth FEA model of face-gear is established in ABAQUS, which is used to carry out the loaded tooth meshing simulation. During this process, the contact ratio, transmission error and distribution factor of load are calculated, and the influence of loads upon these transmission performances is studied. The contact and bending stresses are computed, and dangerous positions are found out, when taking account of one meshing cycle for single tooth.4. In terms of point contact between the tooth surfaces, the contact stresses of muti-tooth in contact for face-gear drive are studied, and several factors on it are taken into consideration, then a conclusion that the contact stresses of muti-tooth model are decided by the distribution factor of load, is got. Based on the analytic computation formula and FEA method, a new method for calculating contact strength is proposed.5. An experiment on face-gear drive is taken out, which researches the bending stress of tooth root, and the results are compared with those of simulations for FEM. The rolling check is performed in a machine, and the contact areas of the face-gear drive are checked out, whose results agree with the contact areas of TCA and LTCA.