Vehicle Front Horn Layout Using a Bumper Through-Hole
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Solution Overview
Problem
Conventional vehicle front portion structures with horns disposed directly under the bumper reinforcement are prone to sound pressure drops and horn failures due to road surface interference or foreign matter entry.
Innovation Solution
A vehicle front portion structure featuring a bumper reinforcement with an absorber having a notch portion forming a through hole, a lower grille at the bumper cover, and a horn supported at the upper wall of the bumper reinforcement, where the horn's resonance portion faces the through hole, thereby transmitting sound effectively and protecting the horn from interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the horn is disposed directly under the bumper reinforcement to ensure sound pressure performance, then sound pressure drop is suppressed, but the horn becomes vulnerable to road surface interference and foreign matter entry
Solution Approach 1:
The horn is repositioned from a horizontal arrangement (directly under the bumper reinforcement) to a vertical arrangement (above the bumper reinforcement with resonance portion facing downward through the through-hole). This dimensional change allows the horn to maintain sound pressure performance while elevating it above harmful road surface conditions and foreign matter.
2Reliability
If the horn is disposed directly under the bumper reinforcement, then sound pressure performance is improved, but sound transmission efficiency deteriorates due to interference from the bumper reinforcement structure
Solution Approach 1:
A through-hole is created in the bumper reinforcement to extract the sound transmission path from the obstructed environment (under the bumper reinforcement) to a clear path (through the bumper reinforcement). This allows sound to transmit efficiently without being blocked or absorbed by the bumper reinforcement structure.
Solution Approach 2:
The sound transmission path is changed from a horizontal path under the bumper reinforcement to a vertical path through the bumper reinforcement. This dimensional change eliminates interference from the bumper reinforcement structure while maintaining sound pressure performance.
3Object-affected harmful factors
If the horn is positioned above the bumper reinforcement through the through-hole, then protection from road surface interference is achieved, but sound pressure performance may deteriorate
Solution Approach 1:
The through-hole in the bumper reinforcement acts as an intermediary structure that connects the horn's resonance portion (above the bumper) with the external environment (below the bumper). This intermediary allows sound to transmit efficiently while the bumper reinforcement itself provides protection from road surface interference and foreign matter.
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 configuration effectively suppresses sound pressure drops and prevents horn failures by ensuring sound transmission through the through-hole and positioning the horn above potential interference points.
Implementation Method 1
a horn which is supported at an upper wall of the bumper reinforcement (26U), and which is disposed such that a resonance portion (42) faces the through hole H from an upper side
Data Source
AI summary
A vehicle front portion structure includes: a bumper reinforcement that extends substantially in a vehicle width direction at a front portion of a vehicle; an absorber that is provided at a vehicle front side of the bumper reinforcement, and that includes a notch portion forming, together with a front wall of the bumper reinforcement, a through hole that penetrates in a vehicle vertical direction; a lower grille that is provided at a bumper cover at a vehicle lower side of the absorber, as seen in front view; and a horn that is supported at an upper wall of the bumper reinforcement, and that is disposed such that a resonance portion faces the through hole from a vehicle upper side.