Four-port port plate for torque balance and shock mitigation

Abstract

The invention discloses a valve plate with four flow allocation windows and capable of balancing torque and easing impact. The valve plate is applicable to asymmetric axial plunger piston pumps. One oil absorbing window and three oil discharging windows are formed in a round plate, and under the circumstance of not changing a pump body structure, the generated instantaneous pressure impact can beeased when a plunger piston cavity is communicated with damping grooves formed in the front ends of the oil discharging windows; it is avoided that an imbalanced one-way torque effect is generated ona variable oblique plate by a plunger piston slipping boot assembly, and therefore the variable performance of an asymmetric axial plunger piston pump is improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pumps, and in particular relates to a four-distribution window distribution plate capable of balancing torque and alleviating impact. Background technique [0002] The hydraulic system (pump control system for short) in which the hydraulic pump directly controls the hydraulic actuator has the advantages of simple structure, small size and high efficiency, and has been popularized and applied in the fields of industrial equipment, walking machinery, and aerospace. The asymmetric axial piston pump is a new type of axial piston pump specially proposed to solve the unbalanced flow between the two chambers of the single piston rod hydraulic cylinder in the pump control system. [0003] The invention patent "Closed Electro-hydraulic Control System" (Patent No.: 200610012476.2) discloses a 3-port axial plunger pump, on which three oil suction and discharge distribution windows arranged in series or in ...

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Problems solved by technology

[0004] The above distribution plate structures are specially designed for asymmetric axial piston pumps, but because the transition area between the two independent oil suction and discharge distribution windows in series is located in the area where the plunger descends faster, it will produce a relatively fast flow rate. Large pressure shock, and will cause the resultant force point of the plunger shoe assembly on the swash plate of the axial piston pump to always be on one side of the swash plate shaft (such as figure 2 shown), and the resultant moment of the plunger shoe assembly on the swash plate of the axial piston pump is a one-way moment (such as image 3 As shown), the swash plate is in a static state; while for the parallel oil suction and discharge distribution window structure, since the area of ​​the oil suction and discharge port of the axial piston pump distribution plate is greatly reduced, there are problems such as poor oil suction and discharge; The type valve plate requires the plunger cylinder to be provided with two parallel plunger holes. This design makes the structure of the pump body more complicated and increases the size of the axial plunger pump.

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