Reliability Design And Finite Element Analysis Of Strength For Zero-tooth-difference Gear Mechanism

Electrical Submersible Progressing Cavity Pump (ESPCP) technology has been the research focal spot with its increasing application in the field of oil extraction industry, which attracts more attention on the research and amelioration of ESPCP.The system is formed by six primary parts:protector, frequency converter, PCP, coupling, gear reducer and down-hole electrical motor. The zero-tooth-difference internal gear mechanism of the coupling is one of the most important components in ESPCP system, which determines lifespan of the whole system. The involute zero-tooth-difference internal gear mechanism is used in the trust-offset gear coupling to achieve the planet deflexion movement of output shaft relative to input shaft in this paper.The paper first analyzed the tooth profile engaging process of the internal gear coupler with zero-tooth-difference and determined the starting points and the ending contact ones. Then indicated the unreasonable points of verifying the strength of gear teeth with the traditional scales, and the other reasonable equations are therefore provided.Secondly, the paper analyzed the part of work that the zero-tooth-difference internal gear mechanism did and the reason for short life in ESPCP system, and introduced the theories and the knowledge of finite element software. After analyzing the structure, dynamics and finite element statics of the mechanism at 120℃by use of ANSYS software, the distribute of stress-strain and the distortion content of structure can be obtained.The powerful theories and abundant data is provided for modification of the mechanism in ESPCP system in the future.