Hydropneumatic Tensioning Device with Nested Piston for Compact Overload Management
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Solution Overview
Problem
Existing tensioning devices for applying force to components like press-down or deflection rollers have a significant construction length and lack reliability, particularly in overload conditions, as they do not efficiently manage changes in tensioning force without increasing length.
Innovation Solution
A hydropneumatic tensioning device with a piston and piston rod configuration, where the piston is guided within the piston rod and cylinder housing, utilizing a gas pressure spring and hydraulic medium to apply tensioning force, ensuring minimal construction length and enhanced reliability by allowing the piston to project beyond the piston rod during maximum extension, thus providing a controlled overload path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional tensioning device with cylinder housing and piston rod is used, then the device can apply tensioning force to the component, but the construction length becomes significant and reduces compactness
Solution Approach 1:
The piston rod is nested within the piston, and the piston is nested within the cylinder housing. The piston rod can be inserted into the piston, allowing both components to occupy the same spatial envelope, thereby minimizing the overall construction length while maintaining the ability to apply tensioning force through the nested structure
Solution Approach 2:
The invention utilizes the radial dimension by allowing the piston rod to project radially outward from the piston in a controlled manner. This enables the tensioning device to achieve its functional length in a different dimensional orientation, reducing the axial construction length while maintaining operational capability
2Length of moving object
If the piston rod is constrained within the cylinder housing, then the device maintains compact dimensions, but reliability decreases during overload conditions
Solution Approach 1:
The piston rod is designed with dynamic projection capability, allowing it to extend radially outward from the piston when overload occurs. This dynamic behavior enables the device to maintain compact dimensions during normal operation while automatically providing an overload protection path when required, enhancing reliability without sacrificing compactness
Solution Approach 2:
The piston rod is pre-configured with the capability to project outward from the piston, creating a predetermined overload path before overload actually occurs. This preliminary preparation ensures that when overload happens, the device can immediately redirect forces through the projection path, preventing damage while maintaining compact dimensions during normal operation
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 device maintains a minimal construction length while ensuring high functional reliability by managing tensioning force effectively, preventing length changes until overload, and allowing for adjustable overload paths through controlled piston and piston rod movement.
Implementation Method 1
a gas pressure spring applied to it. The spring force FY generated by the gas pressure spring is at least as great, in this connection, as the tensioning force FX
Implementation Method 2
the distance between piston rod and piston is adjustable, particularly by way of a hydraulic medium
Data Source
AI summary
A tensioning device for applying a tensioning force to a component has a cylinder housing having a hydraulic medium filled axial cylinder, a piston rod guided in the cylinder recess telescoping in a longitudinal axis direction, and displaceable back and forth, projecting out of the cylinder housing at one end, a piston guided in an axial piston rod recess, and displaceable, back and forth, by a limited amount, in the longitudinal axis direction, from a moved-in position to a moved-out position, and a spring element connected with the piston driving the piston in an outward piston movement direction parallel to the longitudinal axis. Force is applied to the piston by the spring element and by the hydraulic medium, so that inward movement of the piston rod into the cylinder housing (8), in the inward piston rod movement direction (77), brings about inward movement of the piston into the piston rod.