Pump body structure of internal gear pump and assembly process thereof

Abstract

The invention discloses a pump body structure of an internal gear pump and an assembly process thereof. The pump body structure comprises a front bearing cover, a middle shell and a rear bearing cover, the middle shell is arranged between the front bearing cover and the rear bearing cover, a gear and a gear ring which are meshed with each other are arranged in the middle shell, and the gear and the gear ring which are meshed with each other are used for pumping oil; sliding bearings are designed on the front bearing cover and the rear bearing cover and used for supporting the gear; the gear ring is driven by the gear to divide two sides of the gear into an oil pump high-pressure cavity and an oil pump low-pressure cavity; and the oil pump low-pressure cavity is connected with an oil inletof the pump body. An elastic pin is used for replacing a steel wire to limit an oil distribution disc frame, the oil distribution disc frame is prevented from rotating along with the gear, a stop pinstructure is improved, machining and assembling are easy, and the service life of the oil pump is long.

Description

Technical field [0001] The invention belongs to the field of oil pumps, and specifically relates to a pump body structure of an internal gear pump and an assembly process thereof. Background technique [0002] The internal gear pump has the characteristics of low noise, low flow pulsation, and high efficiency. Through the axial and radial clearance compensation design, the efficiency can be further improved, and good low-speed performance can be obtained. It is currently widely used in the servo hydraulic field. The internal gear pump adopts radial clearance compensation design to reduce the leakage of radial clearance, improve volumetric efficiency, and improve low-speed performance. The radial clearance compensation structure is composed of an oil distribution plate frame, an oil distribution plate, a sealing roller, a spring sheet, and a stop pin. [0003] figure 1 Shown is the current limit structure of the radial compensation structure, in which the oil distribution plate fra...

AI Technical Summary

Problems solved by technology

[0005] 1. The arc sections at both ends of the stop pin 4 are difficult to process and the processing cost is high

[0006] 2. When the stopper pin is assembled with the front and rear bearing caps, after the ring gear is assembled, if figure 2 The ring gear shown would partially cover the stop pin mounting holes 2.1 in the bearing cap and axial plate, making it impossible to fit the stop pin

The ring gear cannot be installed on the stop pin side first

Currently as image 3 As shown, it is necessary to assemble the ring gear halfway. When a certain distance is ensured between the ring gear and the axial plate, the assembly of the stopper pin is completed. Assembly is difficult and assembly efficiency is low.

[0007] 3. After the steel wire is assembled, there is elastic deformation, and the assembly is difficult

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