Reliability evaluation method for gear pair of high-pressure internal gear pump

Abstract

The invention discloses a reliability evaluation method for a gear pair of a high-pressure internal gear pump. The method comprises the following steps: firstly, defining multiple failure forms of a high-pressure internal gear pump gear pair, and establishing a reliability performance function of each failure form; secondly, calculating the failure probability of each failure form by adopting a saddle point approximation method based on a high-order moment; secondly, constructing an importance measurement model of each failure form of the gear pair of the high-pressure internal gear pump; andfinally, establishing a multi-objective multi-constraint reliability optimization model of multiple performance indexes of the gear pair of the high-pressure internal gear pump. According to the method, the influence of various failure modes of the gear pair of the high-pressure internal gear pump on the reliability of the system is considered, and a plurality of performance indexes required to besimultaneously met by the high-pressure internal gear pump are also considered, so that the working performance of the high-pressure internal gear pump is improved while the gear pair obtained by themethod meets the reliability requirement.

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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