Oil pump variable displacement mechanism adopting hydraulic lead screw and control method of oil pump variable displacement mechanism

Abstract

The invention relates to an oil pump variable displacement mechanism adopting a hydraulic lead screw and a control method of the oil pump variable displacement mechanism. The oil pump variable displacement mechanism mainly comprises a servo motor, a pressing block, a crosshead shoe coupler, a clamping ring, an inner sealing seat, an outer sealing seat, a front end cover, a micro actuator control rod, an oil pump variable displacement push rod and a rear end cover. The two ends of the crosshead shoe coupling are connected with the servo motor and the micro actuator control rod separately, an oil inlet P and an oil return port T are separately formed in the front end cover, an oil inlet P is formed in the rear end cover, and the three oil ports communicate with circumferential and axial oil ports formed in the control rod through internal oil channels. When the servo motor rotates, through a mechanical feedback structure, the angular displacement generated when the servo motor rotates is converted into the axial linear displacement of the oil pump variable displacement push rod, so that the angle of an oil pump swash plate is controlled, and the responsiveness and the control precision of the variable mechanism are improved.

Description

technical field [0001] The invention relates to the technical field of fluid machinery manufacturing, in particular to an oil pump variable mechanism and a control method thereof. Background technique [0002] In the field of fluid transmission, the hydraulic oil pump, as the core power source, has always been the key research object of the professional engineers and technicians. Although some breakthroughs and applications have been made by relying on imitation research and basic material research in some industrial fields that have low requirements on control accuracy and environment, but in some high-end industrial and mobile hydraulic application fields, we still rely on foreign imports. hydraulic pump. Especially for proportional hydraulic pumps with relatively high control accuracy and response, we completely refer to foreign technical solutions and structural forms. [0003] The power control device of the existing proportional hydraulic pump is mainly realized by t...

AI Technical Summary

Problems solved by technology

With the proportional hydraulic pump of this structure, the control pressure oil first passes through the proportional servo valve, and then pushes the variable piston. On the one hand, a relatively large throttling loss occurs. On the other hand, this form of mechanical feedback will eventually affect the proportional hydraulic pump. Responsiveness and control precision

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