Vehicle Door Impact Beam Central Sensor Mounting
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Solution Overview
Problem
Existing impact protection beams for vehicle doors with sensors face challenges in reliable sensor fastening and manufacturing costs, as well as risk of sensor triggering due to twisting and cabling-related tensile stress, which can lead to cracking.
Innovation Solution
A U-shaped impact protection beam with a centrally located sensor and cabling holes in the webs, reducing the need for rotational rigidity and minimizing material costs, while ensuring quicker reaction to impacts and reduced cracking risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is fastened to the side flange of the beam, then the sensor can be securely mounted, but the beam is subject to tensile stress which increases the risk of cracking
Solution Approach 1:
The patent introduces an intermediary fastening mechanism through the central flange that mediates between the sensor mounting requirement and the beam structural integrity. The sensor is fastened to the central flange rather than the side flange, and cabling is routed through holes in the webs, distributing stress away from critical load-bearing areas and reducing cracking risk while maintaining secure sensor attachment
2Measurement precision
If the sensor is situated far from the beam's mass centre, then the sensor can be positioned for optimal detection, but the beam twisting during door slamming may cause premature sensor triggering
Solution Approach 1:
The patent positions the sensor at the beam's mass centre (central flange region), creating an equipotential location where the beam experiences minimal twisting and rotational stress during door slamming. This central positioning ensures that the sensor operates from a stable reference point, preventing false triggering while maintaining accurate impact detection capability
3Reliability
If the beam is designed with rotational rigidity to prevent twisting, then false sensor triggering is prevented, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the rotational rigidity requirement from the overall beam design and localizes it only to the central flange region where the sensor is mounted. This selective approach prevents false triggering at the sensor location while avoiding the need to make the entire beam rotationally rigid, thereby reducing manufacturing complexity and cost
4Ease of operation
If the cabling is fastened to the side flange, then the cabling can be securely attached, but the tensile stress on the side flange increases the risk of cracking
Solution Approach 1:
The patent moves the cabling attachment from the lateral dimension (side flange) to the longitudinal dimension by routing cabling through holes in the webs. This dimensional shift relocates the attachment point away from the high-stress side flange area to the web structure, maintaining secure cabling attachment while reducing the risk of cracking in critical load-bearing regions
Data Source
AI summary
A vehicle door has an impact protection beam (12) which bears a sensor (20) for releasing one or more impact cushions. The beam (12) is a hat beam with its concave side facing towards the interior of the vehicle, and a fitting hole (18) in the central flange (12) for fitting the sensor (20) within the beam. One of the hat beam's webs (13) has clip holes for fitting the sensor's cabling along the beam.