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Epitrochoidal gerotor profiles with asymmetric lobes.

Number: 1552

Author(s) : READ M.

Summary

Gerotor pumps operate with two rotors each rotating in the same direction about parallel but offset axes. Commercial applications for these machines include oil pumps, fuel pumps and hydraulic power transmission. It is also possible to use the gerotor configuration to achieve internal compression by specifying appropriate discharge port geometry, and the addition of helical twist to the rotors has been shown to achieve further benefits of reducing porting losses and power transfer between rotors. In either pump or compressor configuration, a motor drives the externally geared inner rotor. This meshes with the internally geared outer rotor to form a number of separate working chambers. These conjugate rotor profiles can be generated by a range of methods. Each rotor profile must have rotational symmetry, with a repeating lobe profile. These lobe profiles generally also have reflective symmetry about a radial line passing through the lobe tip, and the optimisation of this lobe geometry has been shown to be an important factor in machine performance. It is however possible to generate asymmetric lobe profiles for gerotor machines, allowing further optimisation and improved performance. This paper describes how pin-generated epitrochoidal asymmetric lobe profiles can be defined, establishes the geometric constraints, and characterises the influence of geometry on some key performance parameters in order to investigate the potential benefits of asymmetric lobes.

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Pages: 10 p.

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  • Original title: Epitrochoidal gerotor profiles with asymmetric lobes.
  • Record ID : 30030401
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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