Nested Hydraulic Cylinder Layout for High-Force Compact Tools
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Solution Overview
Problem
Hydraulic tools, such as concrete crushers and scrap cutters, face limitations in efficiency, maneuverability, and weight due to the use of large and expensive hydraulic adjusting cylinders with limited installation space, which restricts the use of stronger and heavier cylinders.
Innovation Solution
A hydraulic adjusting cylinder with a hollow piston rod and additional cylinder rod, creating three fluid chambers controlled by two valve blocks, allowing for a more compact and lightweight design with longer strokes and higher closing forces, and quicker cycle times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large and expensive hydraulic adjusting cylinders with valve hydraulics are used, then closing forces and cycle times are improved, but weight and dimensions increase
Solution Approach 1:
The patent implements a nested cylinder configuration where a second cylinder is positioned inside the first cylinder. The second cylinder's piston rod serves as the cylinder rod for the first cylinder, creating a compact telescopic structure. This nesting arrangement reduces the overall dimensions and weight of the hydraulic system while maintaining the functionality of multiple cylinder chambers for improved closing forces and cycle times
2Force
If stronger and heavier hydraulic adjusting cylinders are used, then closing forces are improved, but installation space requirements increase
Solution Approach 1:
The nested cylinder design allows the second cylinder to be housed within the first cylinder, significantly reducing the external dimensions and installation space requirements. The telescopic arrangement enables the system to achieve higher closing forces through multiple piston areas while occupying minimal space when retracted
Solution Approach 2:
The patent utilizes the radial dimension by arranging cylinder chambers in a concentric configuration rather than extending linearly. The first and second cylinder chambers are positioned at different radial levels, allowing the system to generate high closing forces without increasing the linear installation footprint
3Force
If hollow piston rod with additional cylinder rod is used, then cylinder volume and closing forces are improved, but structural complexity increases
Solution Approach 1:
The piston rod of the second cylinder serves dual functionality: it acts as the piston rod for the second cylinder while simultaneously serving as the cylinder rod for the first cylinder. This multi-functional design reduces the total number of separate components needed, thereby reducing structural complexity while maintaining the ability to generate high closing forces through the nested chamber configuration
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 solution results in a more efficient and compact hydraulic system with quicker cycle times, higher closing forces, and increased maneuverability, addressing the limitations of traditional hydraulic tools.
Implementation Method 1
pressurized fluid supplied to the first, second and third cylinder chamber, respectively
Implementation Method 2
piston body and cylinder piston body perform alternately outward and inward working cycles on account of pressurized fluid supplied to the first, second and third cylinder chamber
Data Source
AI summary
The invention relates to a hydraulic cylinder, for example for use with a hydraulic tool, which hydraulic tool is provided with a frame and an element which is movable with respect to the frame by means of the hydraulic cylinder.A hydraulic tool which is operated by means of a hydraulic cylinder as described above is known from, for example, European patent no. 0641618. This patent discloses a frame which is coupleable to a jib of an excavator or the like and to which an assembly of two jaws can be coupled. One of the jaws is pivotable with respect to the other jaw by means of a hydraulic adjusting cylinder (a double-acting piston/cylinder combination).