Electrically controlled variable-displacement radial piston motor and control method thereof

By using the dynamic flow distribution regulation and hydrostatic suspension control of the electronically controlled variable radial piston motor, the problems of fluid dynamic response and internal leakage of the radial piston hydraulic motor under extreme working conditions are solved, achieving smooth operation and low loss across the entire speed range.

CN122447249APending Publication Date: 2026-07-24NINGBO OUYI HYDRAULIC CO LTD
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Patent Information

Application Number
CN202610902837.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing radial piston hydraulic motors cannot achieve dynamic compensation of the flow distribution window under extreme operating conditions, resulting in short fluid dynamic response time, causing hydraulic pulsation and cavitation. Furthermore, under low speed and heavy load, they cause oil leakage between high and low pressure chambers, weakening the stability of torque output.

Method used

An electronically controlled variable radial piston motor is used. The spindle speed signal is collected in real time through the feedback module, and the distribution advance angle of the rotating distribution shaft is dynamically adjusted. Combined with hydrostatic suspension control and electro-hydraulic proportional execution module, the adaptive distribution timing and stepless precision adjustment of the displacement are realized.

Benefits of technology

Under high-speed or overspeed conditions, the dynamic adjustment of the flow advance angle suppresses hydraulic pulsation, reduces oil leakage under low-speed heavy load, ensures smooth operation of the motor across the entire speed range, reduces mechanical friction loss, and improves detection accuracy and response speed.

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Abstract

The application discloses an electrically-controlled variable-diameter radial plunger motor and a control method thereof, and relates to the field of hydraulic transmission devices.The technical scheme is characterized in that the motor comprises a shell, a main shaft, a plurality of plunger bodies, a cover, a flow distribution shaft cover, a dynamic flow distribution module, a feedback module and a controller.The rotation speed detection unit of the feedback module is arranged at the end of the main shaft to collect the rotation speed.The dynamic flow distribution module comprises a rotation flow distribution shaft with a circumferential rotation degree of freedom and a flow distribution actuator.The controller instructs the flow distribution actuator to drive the rotation flow distribution shaft to circumferentially deflect based on the rotation speed signal, so that the dynamic adjustment of the flow distribution advance angle is realized.The application increases the flow distribution advance angle to compensate the phase at high speed, suppresses the transient pressure pulsation and cavitation;and reduces the flow distribution advance angle at extremely low speed and heavy load, blocks the oil leakage between the high-pressure cavity and the low-pressure cavity, maintains the smooth torque output, and significantly improves the running stability and efficiency of the motor under variable working conditions.
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