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Operational characteristics of internally geared positive displacement screw machines

Read, M. G. ORCID: 0000-0002-7753-2457, Stosic, N. & Smith, I. K. ORCID: 0000-0003-1524-9880 (2017). Operational characteristics of internally geared positive displacement screw machines. In: ASME 2017 International Mechanical Engineering Congress and Exposition. doi: 10.1115/IMECE2017-70228


Cylindrical helical gearing profiles can allow an externally lobed inner gear to rotate inside an internally lobed outer gear while maintaining continuous lines of contact between the gears. A series of separate working chambers are formed between the rotors, and this paper investigates the use of ported end plates to control the period during which fluid is allowed to enter or leave these working chambers. A simple method of defining the rotor profiles is considered, allowing the geometry of such internally geared screw machines to be characterised. The performance of the machine is then investigated for particular applications. The key considerations in this preliminary study are the effect of geometry on the forces and torques that act on both the inner and outer rotors. The results suggest that low rotor contact forces are possible, which is necessary to ensure high efficiency and low wear in practical machines.

Publication Type: Conference or Workshop Item (Paper)
Additional Information: ASME © 2017.
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments: School of Science & Technology > Engineering
[thumbnail of IMECE_2017_draft.pdf]
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