A Reliability Evaluation Method for the Gear Pair of High Pressure Internal Gear Pump

Abstract

The invention discloses a method for evaluating the reliability of a gear pair of a high-pressure internal meshing gear pump. Firstly, multiple failure modes of the gear pair of high-pressure internal gear pump are defined, and the reliability function function of each failure mode is established; secondly, the failure probability of each failure mode is calculated by using the saddle point approximation method based on high-order moments; The importance measurement model of each failure mode of the gear pair of the meshing gear pump; finally, the multi-objective multi-constraint reliability optimization model of the multi-performance indicators of the gear pair of the high-pressure internal meshing gear pump is established. The present invention not only considers the impact of multiple failure modes of the high-pressure internal gear pump gear pair on the reliability of the system, but also considers multiple performance indicators that the high-pressure internal gear pump needs to meet at the same time, so that the gear pair obtained by the method While meeting the reliability requirements, the working performance of the high-pressure internal gear pump is improved.

Description

technical field [0001] The invention relates to the technical field of internal meshing gear pumps, in particular to a reliability evaluation method for gear pairs of high-pressure internal meshing gear pumps. Background technique [0002] Due to the characteristics of simple and compact structure, small flow and pressure pulsation, high power-to-weight ratio, and low noise, internal gear pumps have been widely used in industrial fields such as walking machinery and combined machine tools. Due to the small high-pressure chamber and perfect sealing structure, the internal gear pump has high volumetric efficiency and total efficiency, and there is no trapped oil in the external gear pump. Compared with vane pumps and plunger pumps, internal gear pumps also have the characteristics of small flow pulsation, stable operation, and low noise. They can replace vane pumps and plunger pumps for hydraulic systems that require high control accuracy. However, the advancement of industri...

AI Technical Summary

Problems solved by technology

During long-term operation, the performance of the gear pair of the high-pressure internal gear pump will be rapidly degraded, resulting in unstable quality of the gear pair of the internal gear pump, high early failure rate, and poor reliability.

At present, although domestic enterprises have the production capacity of high-pressure internal gear pumps, there is still a big gap between domestic high-pressure internal gear pumps and foreign products in terms of volumetric efficiency, noise, reliability and service life.

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