An Unloading Independent Variable Radial Piston Pump

Abstract

The invention relates to an unloading type independent variable radial plunger pump. The unloading type independent variable radial plunger pump comprises plunger pumps, an eccentric wheel, a reversing valve cam, reversing valves, a spiral swing cylinder and an oil storage tank, wherein both the eccentric wheel and the reversing valve cam are arranged on the same pump shaft which is connected to a motor, both a first plunger pump and a second plunger pump are connected to the eccentric wheel in a driven mode, both a first reversing valve and a second reversing valve are connected to the reversing valve cam in a driven mode, the first plunger pump is connected to the first reversing valve in an oil-way mode, the second plunger pump is connected to the second reversing valve in an oil-way mode, the first plunger pump is connected to a hydraulic system and the spiral swing cylinder in an oil-way mode through a one-way valve, the second plunger pump is connected to the hydraulic system and the spiral swing cylinder in an oil-way mode through the one-way valve, and a swing cylinder rotating shaft in the spiral swing cylinder is connected to the reversing valve cam. According to the unloading type independent variable radial plunger pump, a cam is adopted to control the reversing valve to unload part of displacement of the working operation of the plunger pumps, and effective oil extraction working operation of the plunger pumps and change of displacement of an oil pump are achieved.

Description

technical field [0001] The invention relates to the hydraulic technical field of mechanical engineering, in particular to an unloading independent variable radial piston pump. Background technique [0002] In the field of hydraulics in mechanical engineering, self-variable hydraulic pumps are required to power hydraulic systems with changing flow requirements. Because the plunger type independent variable hydraulic pump can output the highest pressure, it is widely used in engineering, construction machinery and other equipment, but in the existing plunger type independent variable pump, whether it is axial or radial, the structural There are sliding friction pairs with large forces and large areas such as oil distribution plates and sliding shoes. These sliding friction pairs not only reduce the energy conversion efficiency of the hydraulic pump and increase the heat generated by the pump body, but also limit the dynamic gap seal of the flow distribution mechanism. The fur...

AI Technical Summary

Problems solved by technology

Because the plunger type independent variable hydraulic pump can output the highest pressure, it is widely used in engineering, construction machinery and other equipment, but in the existing plunger type independent variable pump, whether it is axial or radial, the structural There are sliding friction pairs with large forces and large areas such as oil distribution plates and sliding shoes. These sliding friction pairs not only reduce the energy conversion efficiency of the hydraulic pump and increase the heat generated by the pump body, but also limit the dynamic gap seal of the flow distribution mechanism. The further increase in the working pressure of the hydraulic pump also limits the development of the entire hydraulic system in the direction of small and light weight

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