THEORETICAL AND PRACTICAL ASPECTS OF THE WEAR OF VANE PUMPS .A. ADAPTATION OF A MODEL FOR PREDICTIVE WEAR CALCULATION

The aim of this investigation is the development of a mathematical too l for predicting the wear behaviour of vane pumps used in the standard method for indicating the wear characteristics of hydraulic fluids ac cording to ASTM D 2882/DIN 51 389. The derivation of the corresponding mathematical algorithm is based on the description of the combined ab rasive and adhesive wear phenomena occurring on the ring and vanes of the pump by the shear energy hypothesis, in connection with stochastic modelling of the contacting rough surfaces as two-dimensional isotrop ic random fields. Starting from a comprehensive analysis of the decisi ve ring-vane tribe contact, which supplies essential input data for th e wear calculation, the computational method is adapted to the concret e geometrical, motional and loading conditions of the tribe system van e pump and extended by inclusion of partial elastohydrodynamic lubrica tion in the mathematical model. For comparison of the calculated wear behaviour with experimental results, a test series on a rig described in Part B was carried out. A mineral oil-based lubricant without any a dditives was used to exclude the influence of additives which cannot b e described in the mathematical model. A good qualitative corresponden ce between calculation and experiment regarding the temporal wear prog ress and the amount of calculated wear mass was achieved.