Bumper Absorber Notch Layout for Stable Pressure Tube Sensitivity
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Solution Overview
Problem
Maintaining consistent deformation sensitivity of the pressure tube in energy-absorbing components of bumper assemblies is difficult due to varying internal stresses, particularly at curved sections, making precise calibration of air pressure thresholds for automatic hood activation challenging.
Innovation Solution
The energy-absorbing component features notches arranged alternately on both sides of the pressure tube within the retention channel, along with concave retention portions and a shock beam, to maintain deformation sensitivity and constrain the pressure tube, ensuring consistent deformation sensitivity and easy manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure tube is retained in a curved section of the retention channel, then the pressure tube can be constrained and retained, but the deformation sensitivity is reduced due to higher internal stresses
Solution Approach 1:
The retention channel wall is provided with notches at specific locations (curved sections and areas adjacent to hard points) to locally modify the structural properties. These notches create localized stress concentration points that reduce the overall internal stress on the pressure tube, thereby maintaining deformation sensitivity while preserving the constraint function of the curved sections.
Solution Approach 2:
The retention channel wall is segmented by introducing notches that divide the continuous wall structure into separate sections. This segmentation allows the wall to provide constraint force through the notched structure while reducing the cumulative internal stress that would otherwise accumulate along the entire curved section, thus maintaining pressure tube sensitivity.
2Measurement precision
If the retention channel wall is weakened by notches, then the internal stresses of the pressure tube are released, but the constraint force may be reduced
Solution Approach 1:
The notches are strategically positioned at curved sections and areas adjacent to hard points rather than uniformly distributed. This localized placement ensures that constraint force is maintained in critical areas while releasing internal stresses only where necessary to preserve deformation sensitivity.
Solution Approach 2:
The notches act as intermediary elements that mediate between the constraint function and stress reduction requirements. They provide a controlled way to reduce internal stresses while the overall retention channel structure maintains the necessary constraint force through its geometric configuration and the strategic placement of notches.
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 solution ensures consistent deformation sensitivity along the pressure tube's length, facilitating precise calibration of air pressure thresholds for automatic hood activation, while maintaining a simple structure and low economic cost.
Implementation Method 1
the bumper is deformed, at least in the impact zone. This deformation also causes the energy-absorbing component and its pressure tube to deform. The air pressure in the pressure tube changes as a result of this deformation, and this change is detected by the pressure sensor
Implementation Method 2
by providing the plurality of notches arranged alternately on both sides of the pressure tube on the wall of the curved section of the retention channel, it is not only possible to achieve a weakening of the energy absorption component at these locations and to release the internal stresses of the pressure tube
Data Source
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Figure 6~7
AI summary
The present invention relates to an energy-absorption component for a bumper assembly, to a bumper assembly and to a vehicle. The energy-absorption component (2) is configured to be arranged behind a bumper body (1) of the bumper assembly and provided with a retention channel (21) designed to retain a flexible pressure tube (3), so as to deform the pressure tube (3) in the event of an impact on the bumper body (1). The retention channel (21) comprises an intermediate section (211) extending in the transverse direction of the energy-absorption component (2) and a curved section (212) extending from one end of the intermediate section (211), a wall of the curved section (212) being provided with a plurality of notches configured to be arranged alternately on the two sides of the pressure tube (3) in the direction of extent of the retention channel (21).