Vehicle Wire Harness Fixing via Silencer Locking Member
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Solution Overview
Problem
Existing techniques for fixing a wire harness as a separated body to a silencer require insert-molding, which complicates the process and may compromise acoustic insulation due to the formation of holes for locking the fixing member.
Innovation Solution
A wire harness fixing structure that includes a silencer with a bottomed hole and a locking member of higher rigidity, where the fixing member is locked to the silencer using a locking protrusion part, and an insertion part with an insertion regulating part to prevent excess insertion, allowing for stable locking and reduced protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire harness is fixed to a silencer using a fixing member with a hole for locking, then the wire harness can be securely attached, but acoustic insulation is reduced due to the hole formation
Solution Approach 1:
The silencer is divided into two parts: a silencer body part made of acoustic insulating material and a locking member made of rigid material. The locking member contains the hole for the fixing member, separating the acoustic insulation function from the locking function. This allows the hole to be positioned in the locking member rather than the silencer body, minimizing acoustic insulation impact.
Solution Approach 2:
Different parts of the silencer have different material properties: the silencer body part uses soft acoustic insulating material while the locking member uses rigid material with higher structural integrity. This local differentiation allows the locking member to bear the mechanical stress of fixing while the silencer body maintains acoustic insulation performance.
2Reliability
If insert-molding is used to fix the wire harness to the silencer, then the wire harness can be firmly attached, but the manufacturing process becomes complicated
Solution Approach 1:
The fixing structure is segmented into separate components: the silencer, the locking member, and the fixing member (clip). This modular design eliminates the need for complex insert-molding processes while maintaining secure attachment through mechanical locking of the clip into the hole in the locking member.
3Object-affected harmful factors
If a locking member with a bottomed hole is used to fix the wire harness, then acoustic insulation is minimized, but the locking member may get out of position during assembly
Solution Approach 1:
The locking member is pre-integrated with the silencer body part before the wire harness assembly process. The bottomed hole is pre-formed in the locking member at the correct position, ensuring proper alignment and preventing position shifts during subsequent assembly operations.
Solution Approach 2:
The locking member is merged with the silencer body part to form an integrated assembly. This combination ensures the locking member remains in the correct position relative to the silencer while maintaining the acoustic insulation properties of the silencer body.
Data Source
AI summary
A wire harness fixing structure includes; a silencer disposed between a floor mat and a body in a vehicle; a wire harness disposed along a main surface of the silencer; and a fixing member fixing the wire harness to the silencer. A bottomed hole having a bottom is formed in the silencer to be concaved from the main surface in a thickness direction. The fixing member is locked to the bottomed hole, thereby fixing the wire harness to the silencer.