Research On Contact Analysis And Dynamic Characteristics Of Face-gear

Face-gear drive is a new type of gear transmission, due to its simple structure, the possibility of split the torque and light weight; it has show broad application prospects in the helicopter transmission system. This paper according to the characteristics of the face-gear drive, for the purpose to design a high load and long life face-gear, studied the contact mechanics and dynamic characteristics of the face-gear. The main content is as follows:Face gear tooth surface design and geometric modeling. According to the face-gear processing and meshing theory, derived the equations of the face-gear tooth surface and fillet surface, solved the minimum inner radius and maximum outer radius for the face-gear undercutting and pointing of face-gear teeth. Studied the theory of point contact face-gear meshing, and analyzed the generation method of the meshing line. According to the tooth surface equations of the pinion and face-gear, established the geometric models for the pinion and face gear.Face-gear drive loaded tooth contact analysis. According to the face-gear meshing theory, derived the meshing trajectory equations, solved the coordinates of the face-gear meshing point. Calculated the curvature for the pinion and face-gear of the meshing point, Meshing point of contact stress was calculated by the Hertz contact theory, obtained tooth surface contact stress distribution regularity of the face-gear. For the grinding face-gear tooth surface, calculated the contact stress at three different grinding precision levels, obtained surface roughness effect to the contact stress.Face-gear drive dynamic analysis. Established the Finite element analysis model of the face-gear drive, simulated the dynamic characteristics of different pressure angle and number of pinion teeth for the face-gear drive, and obtained the effect of the pressure angle and pinion number to the face-gear meshing performance. Simulated the face-gear drive at different speed, compared the pinion and face-gear vibration characteristics at three speeds, and analyzed the impact of speed to the vibration of the pinion and face-gear.Experimental studies of face-gear drive meshing performance. Manufactured the face-gear for the experiment, tested the transmission error of three different pinion tooth numbers; Carried out the vibration test of the face-gear at three different rotation speeds, obtained the acceleration time-domain diagram and the spectrum of the pinion and face-gear, and verified the theoretical analysis results.