Novel floating bush for outer engaging gear pump

Abstract

The invention relates to a novel floating bush for an outer engaging gear pump, and belongs to the technical field of hydraulic elements. The bush is mainly characterized in that the novel floating bush with the transition curve, a gear pump body and a tooth groove are used for forming a closed pre-pressure-rising oil cavity, and the pre-pressure-rising oil cavity communicates with a high-pressurecavity, so that pre hydraulic force gradually increased from the high-pressure cavity to a low-pressure cavity is generated and is used for balancing the circumferential radial hydraulic force of thegear pump, and bearing force of a bearing is improved; a hydraulic oil collection groove, an oil draining hole, an oil returning hole and an oil draining oil returning groove are formed in the novelfloating bush, and collection and self suction of leaked oil of the gear pump are achieved; a dissymmetry rectangular unload groove is used for avoiding vibration and noise, the volume efficiency is improved, an arch balance area and a high-pressure oil leading hole are formed in the other side face of the novel floating bush to introduce oil of the high-pressure cavity into the arch balance area,generation of overturning moment is avoided, and the leakage amount is reduced.

Description

technical field [0001] The invention relates to the technical field of hydraulic components, and specifically designs a novel floating shaft sleeve for an external meshing gear pump. Background technique [0002] In modern hydraulic technology, the gear pump is the pump element with the simple structure, the largest output and the largest usage. Use the change of the volume between the teeth to realize oil suction and oil discharge. The main advantages are simple structure, small size, light weight, high power density and strong adaptability to harsh working conditions; the disadvantages are that the displacement cannot be adjusted, the flow pulsation and noise are large, the volumetric efficiency is low at low speed operation, and serious leakage, etc. . [0003] Gear pumps are divided into two types: external meshing and internal meshing. External meshing gear pumps generally use a pair of identical involute gears, but oil trapping in external meshing gear pumps seriousl...

AI Technical Summary

Problems solved by technology

The main advantages are simple structure, small size, light weight, high power density and strong adaptability to harsh working conditions; the disadvantages are that the displacement cannot be adjusted, the flow pulsation and noise are large, the volumetric efficiency is low at low speed operation, and serious leakage, etc.

[0003] Gear pumps are divided into two types: external meshing and internal meshing. External meshing gear pumps generally use a pair of identical involute gears, but oil trapping in external meshing gear pumps seriously affects the stability of gear transmission and oil supply. continuity, it will cause cavitation, vibration and noise; the leakage of the external gear pump seriously reduces the volumetric efficiency of the gear pump, resulting in waste of oil; the gear pump is subjected to large radial force and high The unbalanced moment caused by the low-pressure oil chamber not only reduces the life of the bearing, but also increases the deformation of the gear pump shaft, resulting in eccentric wear of the gear pump

The existing technology has not proposed comprehensive and effective improvement measures for the many shortcomings of the gear pump. Generally, the axial leakage problem is improved by adding floating bushings or side plates, but it is easy to cause eccentric wear and cannot achieve a good sealing effect. The gear pump bearing bears high radial force, which reduces the bearing capacity of the bearing

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