Tensioning Pin Closure Element for Pressurized Bore Sealing
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Solution Overview
Problem
Existing closure elements for internally pressurized bores are difficult to install and require precise support during installation, often resulting in complex designs with multiple separate components, making them cumbersome and prone to improper installation.
Innovation Solution
A closure element with a pull pin integrated into the locking disc, allowing for easy installation without needing internal support, where the pull pin is clamped and pulled until it reaches a predetermined breaking point to ensure a defined closing force, using a clamping jaw device with a counter-holder for smooth bore closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-piece closure disc is used, then manufacturing is easier, but installation becomes difficult and requires precise support surfaces
Solution Approach 1:
The closure element is divided into two functional parts: a closure disc and a pull pin. The pull pin is inserted through the closure disc and provides a gripping element for installation. This segmentation allows the closure disc to be simple for manufacturing while the pull pin enables easy installation without requiring precise support surfaces in the bore.
2Ease of operation
If multiple separate components are used, then installation ease improves, but device complexity increases
Solution Approach 1:
The pull pin is combined with the closure disc by inserting the pin through the disc and securing it in place. This merging creates a single integrated closure element that maintains the simplicity of a one-piece design while incorporating the installation advantages of multiple components. The pull pin serves dual purposes: as an installation tool and as part of the final closure structure.
3Manufacturing precision
If the locking disc is supported against an inner counter-surface during installation, then installation depth precision improves, but the bore requires additional machining
Solution Approach 1:
The support function is extracted from the bore and transferred to the pull pin itself. The pull pin protrudes from the closure disc and provides a positive stop against the counter-holder during installation, eliminating the need for precise counter-surfaces in the bore. The installation depth is controlled by the length of the pull pin and the position of the counter-holder, not by bore geometry.
4Manufacturing precision
If a pull pin with predetermined breaking point is used, then closing force definition improves, but the pin structure becomes more complex
Solution Approach 1:
A predetermined breaking point is created in the pull pin during manufacturing, before installation. This breaking point is located at a specific position along the pin's length. During installation, when tensile force is applied, the pin breaks at this predetermined point, automatically limiting the closing force to a defined value. The breaking point structure is simple, typically a reduced cross-section or notch, requiring minimal additional 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
Facilitates quick and secure installation of the closure element with a defined closing force, ensuring a smooth bore surface and reducing the complexity of multiple component assemblies.
Implementation Method 1
Due to the tensile loading of the pin, there is also no need to support the locking disk against an internal mating surface of the component. Since the pulling effect is limited by the predetermined breaking point
Implementation Method 2
it is also ensured that the bore is closed with a defined closing force when installed. The installation of the closure element in the bore of the component is carried out according to the invention in such a way that first the closure disk is inserted with the pull pin and this is then pulled off with a clamping jaw gripping it, whereby it presses the closure disk in the pulling direction against an outer counter-holder until it reaches the predetermined breaking point is separated from the closure disc when a certain tensile stress is reached
Data Source
AI summary
The closure element according to the invention is a tensioning pin (1) which can be tensioned and the head part of which forms a closure disc (2) that can be spread apart by the tensioning pin. Said closure disc is pressed, in the installed state, against the inner wall (6) of the bore to be closed. When a specific tensile stress is reached, the tensioning pin (1) is separated from the closure disc (2) at a predetermined breaking point (7) of the tensioning pin. The easy-to-handle tensioning pin facilitates the installation of the closure in the bore in the component. Since the closure disc (2) is pressed against an outer counterholder (9) during the installation process, it can be inserted into a continuously smooth bore. The limitation of the tensile stress effected by way of the predetermined breaking point also ensures that the bore is closed with a defined closing force.