Abstract
Gerotor pump is a special kind of internal rotary pump, which contains a trochoid profile (commonly called as cycloid). Generation of trochoid is normally realized by external rolling method, namely a circle rotating on a fixed circle without slipping. This paper proposes derivative process of the trochoid profile by means of internal rolling method, which is that internal surface of a circle contacts with a fixed circle and rotates around it without slipping. Moreover the instantaneous flow rate can be obtained by numerically calculating the change ratio of area between the inner and outer rotors in the outlet region of the gerotor pump, which avoids to complicatedly derivative process.
Highlights
Gerotor oil pump belongs to a kind of internal gear pump, which is a positive displacement pump
Gerotor oil pump mainly consists of an inner rotor, an outer rotor, housing in which inlet and outlet ports are machined
This paper focuses on generation of trochoid profile by another proposed way, and analyzes basic parameters of the trochoid profile
Summary
Gerotor oil pump belongs to a kind of internal gear pump, which is a positive displacement pump. Compared with an external or internal gear pump, it keeps advantages of less components, simple structure, compact size, low noise, and low ripple of flow rate. It is widely used in applications of lubricating system of on-road or off-road engines [1]. Input torque is to drive the inner rotor, and the outer rotor rotates with it since they contact each other at less several points of their geometrical profiles. For Gerotor oil pump, the inner and outer rotors have a special type of conjugate profiles which always ensure contact of the inner and outer rotors. This paper focuses on generation of trochoid profile by another proposed way, and analyzes basic parameters of the trochoid profile
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