Bumper Cross Member Layout for Offset Tow Bushing Mounting
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Solution Overview
Problem
Existing motor vehicle bumper assemblies face limitations in the flexible positioning of towing devices, which can lead to vehicle-specific restrictions and challenges in accessibility and stability during towing operations.
Innovation Solution
A motor vehicle bumper assembly design featuring a U-shaped or hat-shaped cross member with a tow bushing attached to a bracket composed of L-profiles, allowing for lateral offset positioning of the tow bushing outside the crash box, and a striking plate to compensate for bending loads, ensuring stable and accessible integration with the cross member and crash boxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tow bushing is integrated into the crash box, then the towing device is stable and structurally integrated, but the positioning flexibility is restricted and accessibility is reduced
Solution Approach 1:
The towing device is segmented into separate components: the bracket is attached to the cross member while the tow bushing is integrated into the bracket. This segmentation allows the bracket to be positioned flexibly on the cross member without being constrained by the crash box structure, while maintaining stable integration through the bracket-cross member connection.
Solution Approach 2:
The bracket serves as an intermediary component between the cross member and the tow bushing. This intermediary structure enables flexible positioning of the towing device on the cross member while providing stable mounting for the tow bushing, thus resolving the contradiction between positioning flexibility and integration stability.
2Area of stationary object
If the tow bushing is positioned close to the crash box, then space is utilized efficiently, but welding accessibility and joining processes are hindered
Solution Approach 1:
The bracket is designed with adjustable positioning capabilities on the cross member, allowing dynamic optimization of the tow bushing position. This enables finding an optimal balance between space utilization (positioning close to crash box when needed) and welding accessibility (positioning away from crash box when joining is required).
Solution Approach 2:
The bracket extends in multiple spatial dimensions from the cross member, allowing the tow bushing to be positioned in three-dimensional space. This enables efficient space utilization by positioning the tow bushing close to the crash box in one dimension while maintaining welding accessibility in other dimensions.
3Strength
If the cross member has a closed profile, then structural strength is improved, but accessibility for joining processes and component integration is reduced
Solution Approach 1:
The cross member profile is segmented to be open rather than closed, creating accessible channels and surfaces. This segmentation provides multiple accessible areas on the cross member surface where the bracket can be attached, maintaining structural strength while enabling easy access for welding and joining processes.
Solution Approach 2:
The open profile design creates multiple accessible surfaces that serve as alternative attachment locations for the bracket. These accessible surfaces act as copies or alternatives to the limited access points in a closed profile, providing multiple options for joining while maintaining structural integrity.
Data Source
AI summary
A bumper assembly for a motor vehicle has a cross member and crash boxes. The cross member has a front side open profile with a rear wall and an upper leg and a lower leg. Furthermore, a tow bushing is provided. The tow bushing is able to be arranged above the upper leg or below the lower leg and is able to be arranged laterally offset next to a crash box.