High-pressure gear pump with intermediate-pressure bearing lubrication

Abstract

The invention discloses a high-pressure gear pump with intermediate-pressure bearing lubrication, which relates to hydraulic machinery. The gear pump is of a two-slice type structure, which is a single-linkage or multi-linkage gear pump comprising a driving gear, a driven gear, two floating side plates and two W-shaped sealing rings, wherein the driving gear and the driven gear are respectively installed on a pump body and a pump cover through sliding bearings, two symmetrical annular slots are made on the inner side surfaces of the floating side plates and are gradually shallow grooves or gradually narrow grooves, one ends of the grooves are communicated with a high-pressure zone, and medium pressure in the grooves is transitioned to an intermediate-pressure zone step by step from a high-pressure zone. The intermediate-pressure zone is communicated with the lubricating surfaces of the sliding bearings through an intermediate-pressure oil delivery slot so that the high-pressure gear pump has sufficient oil supply and good lubricating effect. Flowing intermediate-pressure oil rapidly radiates temperature rise of the surfaces of the bearings so that the problem of abnormal bearing abrasion caused by temperature rise is effectively solved, the service life of the bearings is prolonged, and therefore, the gear pump can possibly work under a high pressure for a long term.

Description

Technical field [0001] The invention relates to a hydraulic machine, in particular to a high pressure gear pump with a sub-high pressure lubricating oil groove on a floating side plate. Background technique [0002] High-pressure gear pumps required for construction machinery, lifting and transportation machinery, etc., require rated pressure to reach 23MPa, and actual operating pressure to exceed 25MPa. Due to the high outlet pressure of the gear pump and the large pressure difference between the inlet and outlet of the pump body, the sliding bearing supporting the gear shaft is subjected to huge radial pressure. As a result, the temperature of the sliding bearing rises and wears quickly when the gear pump works for a long time. Service life. How to improve the lubrication effect of the bearing and reduce the temperature of the bearing has become a key issue in improving the service life of the gear pump. Summary of the invention [0003] In order to solve the above technical p...

AI Technical Summary

Problems solved by technology

Due to the high outlet pressure of the gear pump and the large pressure difference between the inlet and outlet of the pump body, the sliding bearing supporting the gear shaft bears a huge radial pressure, which causes the temperature of the sliding bearing to rise and wear quickly when the gear pump works for a long time, reducing the wear of the bearing. service life

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