Hydraulic Machine Unit Pressure Control for Variable Working Force
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Solution Overview
Problem
Hydraulic machine units face complexity in operating at varying working forces, often requiring additional drive cylinders or complex counter-pressures to achieve different force levels.
Innovation Solution
Incorporating a pump/piston accumulator system with a proportional pressure-reducing valve that hydraulically connects the piston accumulator to the main cylinder, allowing for selective pressure reduction during work strokes, thereby eliminating the need for additional drive cylinders and enabling flexible force variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional drive cylinders or complex counter-pressures are used to achieve different force levels, then working force variability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by using a proportional pressure-reducing valve to continuously adjust the output pressure of the hydraulic system. This allows the working force to be varied between 40% and 90% of the maximal force by changing the pressure parameter, eliminating the need for multiple discrete drive cylinders or complex counter-pressure mechanisms while maintaining full adaptability of working force levels
2Adaptability or versatility
If additional drive cylinders are added to achieve different working forces, then adaptability is improved, but structural complexity increases
Solution Approach 1:
The proportional pressure-reducing valve serves multiple functions: it regulates working pressure, enables continuous force variation, and replaces the need for multiple specialized drive cylinders. This single component performs what would otherwise require several additional structural elements, thereby achieving force variability without increasing structural complexity
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
This configuration allows for the implementation of multiple working force levels without additional structural measures, achieving force variability between 40% and 90% of the maximal force, and enables infinite force variation within the proportional pressure-reducing valve's range, adapting to diverse customer demands.
Implementation Method 1
a piston accumulator, into which the pump system can discharge a working medium under pressure, by which a high working pressure can be made available in a simple manner at least for the work stroke
Implementation Method 2
the work stroke control valve (50) comprises a proportional pressure-reducing valve (52), by which the working pressure can be reduced in a proportional manner
Data Source
AI summary
A hydraulic machine unit that can be operated with various working forces, in which working medium is selectively delivered, via a pump-piston accumulator system, to a main cylinder and at least one driving cylinder, wherein at least for one working stroke a pump system of the pump-piston accumulator system is used to provide working medium to a piston accumulator of the pump-piston accumulator system, and then at least for the working stroke at least the main cylinder is charged with a working pressure from the piston accumulator, and wherein at least for a return stroke the at least one driving cylinder is charged with a return stroke pressure from the pump-piston accumulator system, can be of structurally simple configuration if, at reduced working forces, the working pressure is reduced with respect to the piston accumulator pressure prevailing in the piston accumulator.