Connecting Element Tensioner Reset Using Spring Preload
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Solution Overview
Problem
Existing screw tensioning devices require high forces to move components relative to each other, especially when the fluid chamber is vented, making it difficult for operators to shift the engagement element into a reset or starting position, which affects operability and operational safety.
Innovation Solution
A device with a reset unit preloads the engagement element relative to the support element, using a connecting ring and disc springs to apply a preload force, facilitating easier positioning of the engagement element into its reset position and reducing the effort required by operators, while ensuring proper alignment and reducing frictional forces from seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seals are provided between movable components to ensure leak-tightness of the fluid chamber, then reliability is improved, but high forces are required to move the engagement element relative to the support element, worsening ease of operation
Solution Approach 1:
A reset unit with a spring element is provided to pre-load the engagement element in the retracted position before hydraulic actuation. This preliminary action ensures that when the piston moves during reset, the engagement element is already biased toward retraction, reducing the force needed to overcome seal friction and move the component back to starting position.
Solution Approach 2:
The spring element in the reset unit acts as a counterforce mechanism that opposes the frictional forces generated by the seals. By providing this counteracting force, the operator's effort to move the engagement element is significantly reduced, especially when venting the fluid chamber during reset operations.
2Ease of operation
If the engagement element is moved relative to the support element during reset, then operability is improved, but high frictional forces from seals increase the required operator effort, worsening ease of operation
Solution Approach 1:
The reset unit applies a preliminary preload force to the engagement element via the spring element, positioning it favorably before the reset operation begins. This reduces the additional force the operator must apply during the actual reset movement, making the operation easier despite the presence of frictional seals.
Solution Approach 2:
The spring element acts as an intermediary mechanism between the hydraulic system and the engagement element. It mediates the force transmission by storing and releasing elastic energy to assist in moving the engagement element through the seals, reducing the direct force requirement from the operator.
3Reliability
If strong seals are used to prevent fluid leakage, then reliability is improved, but the device complexity increases due to additional sealing components
Solution Approach 1:
The piston serves multiple functions: it acts as both the hydraulic actuator for moving the engagement element and as part of the sealing system for the fluid chamber. By integrating these functions, the patent reduces the number of separate sealing components needed while maintaining reliable fluid containment during high-pressure operations.
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 preload force assists in setting the device into its reset state, reducing operator effort and improving operability, while ensuring proper positioning and increasing operational safety by counteracting frictional forces and enhancing the device's usability in applications like steel constructions and engine design.
Implementation Method 1
a reset unit comprising a spring element configured to exert a preload force onto the engagement element
Data Source
Figure 1
Figure 2
AI summary
The present invention refers to a device (10) for tensioning a connecting element (12) fastened to a component (18, 20) to be tightened. The device (10) comprises an engagement element (24) connectable to the connecting element (12), and a support element (40) configured to support the device (10) against the component (20) and to translationally guide the engagement element (24) relative to the component (18, 20). Further, the engagement element (24) is preloaded relative to the support element (40).