Research On Methods Of Prolonging Life For Face-gear With Morphology Under Oil-lack Lubrication Conditions

Face-gear is one part of the core component of the drive system of armed helicopter. It is easy to make drive system failure, which can cause crash tragedy, when the armed helicopter was attack and lost lubricating oil. So, if the service life of face-gear can be improved on conditions of loss of lubricating oil, as well as the living space of the helicopter in battlefield. In the process of the losing of lubricating oil, the temperature on face-gear tooth surface will constantly rise, concomitantly, bonding and over-wearing were happened. In traditional friction theory, surface treatment to improve hardness, reducing surface roughness, improving the performance of lubricating oil are general methods to enhance anti scuffing and wear resistance. While, the limitations of these methods are strong, the effect is not ideal. Surface texturing method is put forward to enhancing anti-scuffing and wear resistance in the paper. The main contents are as follows.The equation of face-gear tooth surface is derived according to the principle of face-gear shaping by a pinion cutter. Then, the minimum diameter and the maximum diameter of the face gear are determined On condition that without undercut and sharpening in the shaping process. Finally, The 3D solid modeling of face-gear with tooth micro morphologies is built using Matlab and Pro/E.With the use of ANSYS,we concluded that the influence of diameter, spacing and depth of concave units of tooth surface on stress and elastic deformation on tooth surface contact. Similarly, with combining the equation of oil thickness, the influence of diameter, spacing and depth of concave units of tooth surface on the oil thickness of EHL in face-gear transmission was obtained. Compared with the smooth face-gear, the face gear with concave micromorphology has better oil thickness. Connectivity is an important index to measure the flowing and storage of lubricating oil on tooth surface. The influence of diameter and spacing of concave units on tooth-surface concave connectivity was got using mathematical morphology, that the connectivity come better with the increase of diameter and reduction of spacing.With the use of YD9550 type gear contact detection machine, the influence of surface dimple morphology on transmission error and noise of face-gear drive was detected. Compared with the smooth face-gear, the existence of Concave appearance can increase face-gear transmission error slightly, but reduce transmission noise greatly. The performance that the pinion’s rotating speed can be adjusted and the torque on face gear can be increased on the YD9550 type gear contact detection machine, which can be used to verify that concave appearance on tooth surface can reduce friction temperature rise and tooth wear in face-gear drive.