Hydraulic plunger pump variable displacement control structure and its control method

摘要

A hydraulic plunger pump variable control structure (100) and a control method for the same are provided. The hydraulic plunger pump variable control structure (100) includes a valve body (1), a main valve core (2) and a main valve sleeve (3). The main valve core (2) has a first end provided with a spring loaded assembly (4), and a second end provided with a pilot valve core (6), the spring loaded assembly being configured to provide a reverse preloading force. The main valve sleeve (3) is connected with a feedback rod (5) that is connected with a variable piston pump. A valve sleeve (7) is disposed outside the main valve core (2). The pilot valve core (6) is pushed by hydraulic oil to overcome the preloading force of the spring loaded assembly (4), thereby driving the main valve core (2) to move; the moved main valve core (2) produces relative displacement with respect to the valve sleeve (7), controls the hydraulic oil to flow into the variable piston pump, and during the movement of the variable piston pump, drives the main valve sleeve (3) along an opposite direction of a movement direction of the main valve core (2).