Durability increase of gear pumps in agricultural machinery
Tehnologìčnij Audit ta Rezervi Virobnictva
The purpose. To detect effect which originates during optimization of parameters of toothing of gear pump (GP). Methods. Theoretical-experimental methods of probe. On the basis of the developed mathematical model of process of feed of GP the design procedure is offered of optimum parameters of toothing, where parameter of optimization is the coefficient of use of volume of wreaths of sprockets. Results. During adaptation (to production conditions) of the construction of experimental pump with
... imental pump with the augmented specific working volume they determined an opportunity of decreasing width of a cone at saving working volume of pump matching standard norms. It made it possible to reduce load on bearings of pump which primarily were responsible for reliability of the pump. New dependence is offered for account of load on bearings of pump, which in many aspects is determined by coefficient of overlapping of toothing. During designing the gear pump with optimum parameters and adaptation its operation parameters to standard norms they found synergetic effect, namely: decrease of overall dimensions and mass of the designed pump. Conclusions. The developed design procedure of parameters of toothing of rocking node of gear pump made it possible to design construction of GP with augmented specific working volume and feed. Thus coefficient of use of volume of wreaths of sprockets of the experimental pump grew up to 0,3323, that on 11% was more than at serial pump, and working volume of pump reached 36,33 cm3, that on 14,6% was more than at serial pump. It stipulated synergetic effect which was implemented in lowering overall dimensions and mass of the designed pump. On the basis of the developed mathematical model of the feeding process of a gear pump, the method for calculating toothing parameters with optimal parameters was suggested. As an optimization parameter, it was proposed to use the operation coefficient of the volume of gear rims. The objective of the study was to identify the effect that takes place in the process of optimizing toothing parameters of the gear pump. In the process of adapting the design of the experimental pump with increased specific working volume to the production conditions, it was possible to reduce the width of the gear having the same working volume of the pump. This working volume corresponds to the standard values. This allowed reducing the load on the pump bearings, which are mainly responsible for the reliability of the pump. At the same time, a new correspondence was suggested for the calculation of the load on the bearings of the pump, which in many ways, as it turned out, is determined by the coefficient of overlapping of the toothing. In the process of designing a gear pump with optimal parameters and adapting its operational parameters to the standard values, a synergistic effect was found which was expressed in reducing the overall dimensions and the weight of the designed pump by an amount significantly more significant than expected. The method of calculating toothing parameters of the pumping unit has been developed, which allowed designing the gear pump with the increased specific working volume and feed. At the same time, the operation coefficient of the gear rims of the experimental pump increased to the value of 0.3323, which is 11% more than that of a production pump. The working volume of the pump reached 36.33 cm 3 , which is 14.6% more than in the production pump This allowed appearing a synergistic effect, which is realized in reducing the overall dimensions and the weight of the designed pump at the value significantly more significant than expected. gear pump, hydraulic oil, toothing, pump working volume, specific working volume of a pump, synergistic effect Problem statement.