Gear transmission error outside the normal path of contact due to corner and top contact

• Published in: Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Vol. 213; no. 4; pp. 389 - 400
• Main Authors: Munro, R. G., Morrish, L, Palmer, D
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.01.1999; Mechanical Engineering Publications; SAGE PUBLICATIONS, INC
• Subjects: Applied sciences; Drives; Exact sciences and technology; Gears; Mechanical engineering. Machine design; corner contact; transmission error; path of contact; top contact; gear; Helical tooth; Spur gear; Modeling; Transmission error
• ISSN: 0954-4062; 2041-2983
• DOI: 10.1243/0954406991522347

Abstract This paper is devoted to a phenomenon known as corner contact, or contact outside the normal path of contact, which can occur in spur and helical gear transmission systems under certain conditions. In this case, a change in position of the driven gear with respect to its theoretical position takes place, thus inducing a transmission error referred to here as the transmission error outside the normal path of contact (TEo.p.c). The paper deals with spur gears only, but the results are directly applicable to helical gears. It systematizes previous knowledge on this subject, suggests some further developments of the theory and introduces the novel phenomenon of top contact. The theoretical results are compared with experimental measurements using a single flank tester and a back-to-back dynamic test rig for spur and helical gears, and they are in good agreement. Convenient approximate equations for calculation of TEo.p.c suggested here are important for analysis of experimental data collected in the form of Harris maps. This will make possible the calculation of tooth stiffness values needed for use in theoretical models for spur and helical gear transmission systems.