Hydromechanical Cylinder Supply Using Screw-Nut Servo Control
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Solution Overview
Problem
Existing hydraulic systems for actuator servo-control, particularly those requiring high forces with controlled displacement speeds of a few microns per second, are complex due to the need for sophisticated control circuits and pumps, which complicates their operation and efficiency.
Innovation Solution
A hydromechanical device comprising double-action hydraulic linear generating cylinders with integral pistons and screw-nut assemblies, driven by an electric motor with variable transmission, supplies pressurized liquid to opposing active chambers of a double-rod receiving cylinder, using solenoid valves for precise control and compensation for compressibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex control circuits and pumps are used for servo-control of hydraulic actuators, then precise control of position and force is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex hydraulic control circuits and pumps with a mechanical screw-nut assembly that converts rotational motion from an electric motor into precise linear displacement of the piston. This mechanical substitution eliminates the need for sophisticated hydraulic control systems while maintaining precise position and force control capabilities.
Solution Approach 2:
The patent uses hydraulic pressure generated by the moving piston within the cylinder to directly control the force applied by the actuator. By integrating the pressure-generating mechanism (piston) with the movement control mechanism (screw-nut assembly), the system achieves precise force control without requiring separate complex hydraulic control circuits.
2Force
If high forces are applied with controlled displacement speeds, then actuator performance is improved, but system complexity increases
Solution Approach 1:
The patent merges the force-generating function (hydraulic pressure) with the movement-control function (screw-nut assembly) into a single integrated mechanism. The piston simultaneously generates hydraulic pressure for force application and, through its linear motion controlled by the screw-nut assembly, controls displacement speed. This consolidation reduces system complexity while maintaining high force output and precise speed control.
Solution Approach 2:
The piston serves multiple functions: it generates hydraulic pressure for force application, controls displacement speed through its motion rate, and enables bidirectional force application (push and pull) through double-acting cylinder design. This multi-functionality reduces the need for separate components, thereby reducing system complexity.
3Adaptability or versatility
If double-action hydraulic cylinders are used for bidirectional force control, then actuator versatility is improved, but device complexity increases
Solution Approach 1:
The patent uses a double-acting hydraulic cylinder where the piston can be pushed in either direction by hydraulic pressure applied to opposite sides of the piston. This inversion of the traditional single-acting design allows bidirectional force control (push and pull) without requiring complex mechanical linkages or additional components, achieving versatility with relatively simple system architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables precise servo-control of position, displacement, and force with reduced complexity, allowing controlled displacements of a few microns and efficient force application, while minimizing system complexity and operational costs.
Implementation Method 1
an assembly for driving the first movement input rod of the first double-action hydraulic linear generating cylinder comprising a mechanical movement transformation assembly, in particular a screw-nut assembly
Implementation Method 2
hydromechanical device for supplying pressurized liquid to each of two opposing active chambers of a double-action hydraulic linear receiving cylinder
Data Source
AI summary
The hydromechanical device (102) for supplying each of two opposing active chambers (vr1ca1, vr1ca2) of a double-acting receiving cylinder (vr1) for servo-controlled operation of at least one first output rod (vr1ts1, vr1ts2) INCLUDES: a first double-acting generating cylinder (vg1) INCLUDING a first movement input rod (vg1te1) which is rigidly connected to a first piston (vg1p1) that delimits two first opposing passive chambers (vg1cp1, vg1cp2), each of which is selectively connected to at least one of THE two opposing active chambers of the receiving cylinder (vr1); and an assembly (110) for driving the first rod (vg1te1) of the first generating cylinder (vg1), INCLUDING a movement-transforming screw-nut assembly (112, 114), one movement output component (114) of which is rigidly connected to the first rod (vg1te1) of the first generating cylinder (vg1) and the other movement input component (112) of which is rotated by a drive motor (m1).