Cylinder-Piston Unit Adjustable Stroke Limiting Mechanism
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Solution Overview
Problem
Existing cylinder-piston units lack a reliable, space-saving, and cost-effective solution for limiting the stroke of the piston rod, particularly in applications requiring precise control and adjustable movement in both directions, such as in machine tools like bending machines.
Innovation Solution
A cylinder-piston unit with a counter-stop part that forms different limit stops in two axially spaced areas, allowing adjustable stroke limitation in both directions, featuring a compact design with rotatable sections and integrated limit stops, and a holder for secure fixation, enabling flexible and reproducible stop settings without additional adaptations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stroke limiter is added to the cylinder-piston unit, then the stroke control reliability is improved, but the device complexity and space requirements increase
Solution Approach 1:
The stop part is integrated into the piston rod structure, and the counter-stop part is integrated into the cylinder head structure. This merging of functions reduces the number of separate components and simplifies the overall device complexity while maintaining reliable stroke control through the coordinated interaction of these integrated elements.
Solution Approach 2:
The counter-stop part is designed to form different limit stops in two axially spaced areas, enabling it to control stroke in both directions (extension and retraction). This multi-functional design allows a single component to perform multiple stroke limitation functions, improving reliability without proportionally increasing device complexity.
2Adaptability or versatility
If a stroke limiter with adjustable stops in both directions is implemented, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The counter-stop part is designed to be rotatable relative to the cylinder, allowing the limit stops to be adjusted to different angular positions. This dynamic adjustment capability enables flexible stroke control in both directions without requiring complex mechanical adjustment mechanisms, as the rotation itself provides the adaptability needed.
Solution Approach 2:
The limit stops are arranged in two axially spaced areas along the longitudinal axis of the cylinder. By utilizing this axial dimension, the system can independently control stroke limitation in both the extension and retraction directions, achieving high adaptability through spatial arrangement rather than through complex mechanical linkages.
3Volume of moving object
If a compact stroke limiter design is used, then the space requirements are reduced, but the adjustment precision may be compromised
Solution Approach 1:
The stop part with stop structures is positioned within the cylindrical space defined by the cylinder, and the counter-stop part with limit stops is integrated into the cylinder head structure. This nested arrangement allows the stroke limitation mechanism to be compact while maintaining precise stop settings through the accurate geometric relationships between the nested components.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with a simpler rotational positioning system. The counter-stop part can be rotated to different angular positions to set the limit stops, providing precise adjustment capability without requiring elaborate mechanical linkages or multiple adjustment components, thus achieving compactness without sacrificing precision.
Data Source
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AI summary
The invention relates to a cylinder-piston unit (1), the piston (4) of which is connected to a piston rod (3) which projects out at an end side of the cylinder (2). Here, the cylinder-piston unit (1) has a variably adjustable stroke limiting device in the form of an abutment mechanism (5) which comprises an abutment piece (6) and a counterpart abutment piece (11), wherein the abutment piece (6) is fastened by way of a first section (7) to a part, which projects out of the cylinder (2), of the piston rod (3) and, in an abutment position, interacts by way of a second section (8), which runs along the outside of the cylinder (2), with the counterpart abutment piece (11), and wherein the counterpart abutment piece (11) is held axially with respect to the cylinder (2), and wherein the counterpart abutment piece (11) is rotatable relative to the abutment piece (6), wherein the abutment piece (6) and counterpart abutment piece (11), as a function of the relative rotational position, form different abutment pairs by means of which the travel of the piston rod (3) can be limited to a varying extent.