Transient Simulation Of Wear In A Lobe Pump
Using The Wear Processor
Author(s)
Y. J. Chen & N. Huber
Abstract
Lobe pumps represent an intelligent design principle for fluid technology. They
combine competence in design and complex high-precision manufacturing
processes and find their application in the fields of automotive and mobile
hydraulics industry. The chambers for inlet, movement and outlet of the fluid are
formed in a continuous process by rotating gear-shaped parts, which are sealed by
several sliding contacts. The ability to predict wear in such complex systems is
essential for the development and lifetime prediction. Using a dynamic 2D finite
element simulation, the transient contact pressure and slip conditions are obtained
on the surfaces of the three parts of which the pump consists: inner rotor, outer
rotor and housing. For the wear simulation it is necessary to handle simultaneous
wear in multiple contacts and contacting surfaces. It is shown that it is possible to
predict wear in such a system over a large number of rotations with considerable
effect on the geometry of the different components. The simulations allow one to
predict the number of rotations for a given wear coefficient until critical gaps are
formed, which can significantly reduce the performance of the lobe pump.
Furthermore, the wear profiles show that the wear between the outer rotor surface
and the housing reflects the pressure difference in the pump as well as the
symmetry of the rotors. This work shows that it is possible to predict wear and the
changing kinematics of systems, which are based on moving contacts. Problems
of future interest are gears, camshaft follower systems, or injection systems.
Keywords: wear, wear prediction, transient contact, numerical simulation.
Keywords
wear, wear prediction, transient contact, numerical simulation
Related Book
Other papers in this volume
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