Axial plunger type variable capacity pump

Abstract

The invention relates to an axial plunger-type variable pump which comprises a swash plate, a slipper, a plunger, a plunger cylinder body and a fuel distributor. A forward tipping part and a backward bending part of the swash plate are respectively connected with a push rod of a push action cylinder; the inner cavities of two push action cylinders are respectively communicated with two output ports of an unsteady valve; the unsteady valve is controlled by a controller; the controller comprises a first comparator, an amplifier and a threshold command source; and the amplifier is connected with a second comparator. The invention has the advantages that the accurate change of delivery capacity of the variable pump can be perceived; the angle of the swash plate is rapidly controlled; and the energy consumption is low, and the efficiency is high.

Description

technical field [0001] The invention relates to a variable displacement pump, in particular to an axial plunger type variable displacement pump. Background technique [0002] Axial piston variable displacement pumps are widely used in various hydraulic systems due to their small size, light weight, high power density, and easy control. [0003] The traditional axial piston variable displacement pump consists of a variable displacement pump with an inclined swash plate and a variable adjustment mechanism. The adjustment mechanism includes a proportional pressure valve, a proportional flow valve and a return spring installed on the swash plate. When the variable displacement pump When the pressure at the oil discharge port is lower than the pressure threshold, the proportional pressure valve and proportional flow valve output pressure and flow to the system according to the set value, resulting in an increase in pressure difference and flow difference, pushing the swash plate ...

AI Technical Summary

Problems solved by technology

However, due to the small force of the return spring, the righting speed of the swash plate is slow; the actual pressure of the oil discharge port is reduced through the natural oil discharge of the oil discharge valve, and the response time of the proportional pressure valve and the proportional flow valve is long, and there is a lag period , and digital control cannot be realized, resulting in the disadvantages of the traditional axial piston variable pump, such as inability to accurately sense the displacement change of the variable pump, slow return speed, large energy consumption, and low efficiency.

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