Expandable Core for Elastic Bearing Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Calibrating elastomer bodies in elastic and hydraulically damping mounts is challenging due to manufacturing-related tensile stresses and difficulties in achieving precise calibration, especially with thick or irregularly shaped cores, which can lead to damage to seals and increased internal pressure.
Innovation Solution
A core comprising a first and second core part, where the second core part can be expanded to introduce a preload into the elastomeric body, allowing for internal calibration without flaring, enabling the use of thick or irregularly shaped cores and preventing seal damage by distributing calibration strains evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external calibration is performed on hydraulic bearings, then the seals can be damaged or pinched off, but internal calibration requires the bearing to be empty which increases complexity of the process
Solution Approach 1:
The core is divided into two separate parts: a first core part that remains stationary and a second core part that is expandable. This segmentation allows the calibration function to be separated from the structural support function, enabling internal calibration without requiring the bearing to be empty or risking seal damage.
Solution Approach 2:
The first core part is inserted into the second core part, creating a nested structure. The second core part can be expanded within the constraints of the first core part, allowing calibration to occur from the inside without exposing seals to calibration forces.
2Manufacturing precision
If flaring is used to calibrate thick cores, then calibration can be achieved, but the process becomes more difficult and non-uniform wall thickness makes targeted calibration impossible
Solution Approach 1:
The second core part is designed with specific local properties - it is expandable in specific directions while maintaining structural integrity in others. This allows targeted calibration in specific directions without requiring uniform expansion, making it possible to calibrate cores with non-uniform wall thickness precisely.
Solution Approach 2:
The second core part is designed to be dynamically expandable during the calibration process. This dynamic expansion capability allows the core to be calibrated to precise dimensions without requiring complex flaring operations, significantly easing the manufacturing process while maintaining high calibration precision.
3Manufacturing precision
If the bore of the core is widened to increase outside diameter, then calibration can be achieved, but the calibration process damages seals and causes inserts to slip or warp
Solution Approach 1:
Instead of widening the core bore from the outside (which damages seals and inserts), the invention inverts the approach by expanding the second core part from the inside. This internal expansion method achieves the same calibration effect without external forces that could damage seals or cause inserts to slip or warp.
Solution Approach 2:
The second core part acts as an intermediary element between the calibration force and the elastomeric body. It transfers the expansion force uniformly to the elastomer without directly contacting seals or inserts, preventing damage to these components while achieving precise calibration.
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
This method allows for precise calibration of both elastic and hydraulically damping mounts without increasing internal pressure, preventing seal damage and enabling the use of thick or irregularly shaped cores, thereby improving the stability and longevity of the mounts.
Implementation Method 1
The second core part (12) can be expanded and has a receiving opening (13) into which the first core part (11) can be inserted
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a core (10) for calibrating an elastomer body (20) of an elastic bearing or of a hydraulically damping bearing (40), the core having a first core part (11) and a second core part (12), wherein the second core part (12) can be widened, in order for prestressing to be introduced into the elastomer body (20), and has an accommodating opening (13), into which the first core part (11) can be introduced, and wherein the second core part (12) has a closed profile. The invention also relates to an elastic bearing, or to a hydraulically damping bearing (40), comprising the core (10) and to a method for producing the elastic bearing (30) or the hydraulically damping bearing.