Coupling gear for high-pressure gear pump

Abstract

The invention discloses a coupling gear for a high-pressure gear pump, relating to a gear pump. The coupling gear is composed of a gear and two gear shafts, wherein the two gear shafts are located at the two ends of the gear; the gear and the gear shafts are connected; the gear shafts are arranged on a pump body and a front cover of the high-pressure gear pump through DU bearings; the gear shafts are conical; the diameters of the joint parts of the gear shafts and the gear are small; the diameters of the outer ends of the conical gear shafts are large; and gear shaft deflection deformation zones D are formed at the joint parts of the conical gear shafts and the gear. When the gear pump operates, under the propelling of resultant force produced by high-pressure oil, the gear shafts are subjected to deflection deformation in the gear shaft deflection deformation zones D and adapted to the supporting surfaces of inner holes of the bearings. A perfect condition is that the generating lines of the conical gear shafts and the generating lines of the inner holes of the DU bearings are in all contact, so that the load distribution of the DU bearings is uniform, and the service life of the bearings is greatly prolonged.

Description

technical field [0001] The invention relates to a gear pump, in particular to a coupling gear used on a high-pressure gear pump. Background technique [0002] The new products developed by domestic and foreign construction machinery manufacturers require that the warranty period of the supporting hydraulic gear oil pump be extended from the original 1 year to 2 years, and some even require 3 years. At present, the service life of hydraulic gear oil pumps manufactured in China generally cannot meet this requirement. Improving the service life of gear pumps has become an urgent matter for gear pump manufacturers. The most important factor affecting the service life of the gear oil pump is the low service life of the bearing. The reason is that the gear shaft is deflected and deformed under the combined force generated by the high-pressure oil, and the bearing cannot produce corresponding deflection, resulting in gear journal and The bearings cannot be in uniform contact, resu...

AI Technical Summary

Problems solved by technology

At present, the service life of hydraulic gear oil pumps manufactured in China generally cannot meet this requirement. Improving the service life of gear pumps has become an urgent matter for gear pump manufacturers.

The most important factor affecting the service life of the gear oil pump is the low service life of the bearing. The reason is that the gear shaft is deflected and deformed under the combined force generated by the high-pressure oil, and the bearing cannot produce corresponding deflection, resulting in gear journal and The bearing cannot be in uniform contact, causing the load to concentrate on the inner end of the bearing, and there will be local wear, heat, burns or damage to the journal due to seizure and fatigue spalling

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