dr valve structure for a4vso pump

Abstract

The invention discloses a novel DR valve structure for an A4VSO pump. The novel DR valve structure comprises a valve body, a tail nut assembly, a main valve core, a pressure regulating assembly and a smaller valve core, wherein the valve body is provided with a valve core cavity, a first duct, a second duct, a pressure relief duct, a first communicating opening, a second communicating opening and a communicating duct, the end face, corresponding to the tail nut assembly, of the main valve core is axially provided with a valve core hole, the small valve core is slidingly arranged in the valve core hole, and a side face of the main valve core is radially provided with a communicating hole communicated with the valve core hole in a way of corresponding to the first communicating opening. The novel DR valve structure can greatly reduce the wear phenomena of the main valve core due to stress and friction, effectively prolongs the service life of the main valve core, and can meet the high pressure stability requirement.

Description

technical field [0001] The invention belongs to the technical field of A4VSO axial plunger pump structure, and in particular relates to an improvement of a DR valve structure for an A4VSO pump. Background technique [0002] Such as figure 1 As shown, the DR valve of the existing A4VSO axial piston pump mainly includes a valve body 1, a tail nut assembly 2, a main valve core 3 and a pressure regulating assembly, wherein the valve body 1 is provided with a valve core cavity 11 for installing the main valve core , The first channel 12 communicating with one end of the spool cavity and for installing the tail nut assembly, the second channel 13 communicating with the other end of the spool cavity and for installing the pressure regulating assembly, and the pressure relief channel 14 communicating with the other end of the spool cavity A first communication port 15 communicating with the spool cavity and communicating with the pressure oil port of the oil pump and the small end ...

AI Technical Summary

Problems solved by technology

Ideally, the direction of the spring force F1 is absolutely opposite to that of F2, but in actual use, since the spring is not a true cylinder, there are errors in its verticality and parallelism, and the spring is also compressed when it is compressed. Deformation errors will occur. Even with spring guide pads, the angle between F1 and F2 is not an absolute 180 degrees, but between 170 degrees and 180 degrees.

If the included angle is 175 degrees, a force of about 87N will be generated to radially push the valve core. If the material of the valve core is poor, the valve core will be squeezed against the hole wall of the valve body under the radial force of 87N. Friction, which accelerates wear and reduces service life, but also causes problems with pressure fluctuations

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