Axial piston variable pump with four oil ports and low-noise parallel distribution structure

Abstract

The invention discloses an axial piston variable pump with four oil ports and low-noise parallel distribution structure. The pump comprises a shell, a front cover, a rear cover, a main shaft, a swash plate cradle, a set plate, a cylinder block, a valve plate, pistons, sliding shoes, a bearing, a variable control mechanism, etc. The cylinder block of the pump is provided with ten piston holes divided into two groups, and each group includes five piston holes located on different reference circles respectively; the pistons are fit to the piston holes of the cylinder block; the center of the cylinder block is provided with a spline hole, and the main shaft penetrates through the cylinder block, and is fit to the spline hole; a friction pair is formed by the distribution end surface of the cylinder block and the valve plate, and another friction pair is formed by the sliding shoes of the pistons in the piston holes of the cylinder block and the swash plate cradle; the upper distribution plane of the rear cover is in static connection with the corresponding end surface of the valve plate; the valve plate adopts a window structure of inner and outer ring distribution, and oil absorption and discharge distribution windows are of parallel double-ring structures which are symmetrical by taking the connecting line passing a top dead center and a bottom dead center as an axis; the rear cover is provided with four oil ports which are independent respectively; and the piston pump has different working modes through combining the four oil ports.

Description

technical field [0001] The invention relates to the axial plunger variable pump technology, in particular to a low-noise parallel flow distribution structure four-port axial plunger variable pump. Background technique [0002] Electro-hydraulic control technology is divided into two categories: valve control and pump control. The biggest disadvantage of the valve control technology widely used at present is that there is a large throttling loss and low energy efficiency. Low energy efficiency not only increases the installed power of the system, but also causes the system to generate heat. The additional cooling device further increases the installed power and cost of the system, and heat is also one of the main reasons for the failure of the hydraulic system. Most of the valve control systems use an open circuit, and the amount of oil used is large, which will cause environmental pollution problems when disposing of waste oil. The use of direct pump control technology and...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the existing axial piston pump cannot be used in both open and closed circuits due to its inability to rotate in both directions, and the working noise is relatively large, the present invention provides a low-noise parallel flow distribution structure with four oil ports Axial piston variable displacement pump

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