Wire Harness Routing Apparatus for Large-Angle Seat Rotation
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Solution Overview
Problem
Existing wire harness routing apparatuses face challenges in accommodating excess wire length when the seat rotation angle exceeds 180 degrees, leading to potential interference with other components due to increased wire harness length and limited accommodation capacity.
Innovation Solution
The apparatus includes a case with a circular accommodation portion on the rotational axis and a bulging second accommodation portion, allowing the excess wire length to be absorbed without hindering seat rotation, with the circular portion conforming to the rotational path and the bulging portion extending outward, enabling smooth wire routing and reduced case size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the rotation absorption case is increased to accommodate excess wire harness length for large rotation angles, then the wire harness can be accommodated, but the case will interfere with other members when the seat is rotated
Solution Approach 1:
The accommodation space is divided into two distinct portions: a first accommodation portion that rotates with the seat and a second accommodation portion that remains stationary. This segmentation allows the wire harness to be distributed across both rotating and non-rotating spaces, eliminating the need for a single large rotating case that would interfere with other members.
Solution Approach 2:
The solution transitions from a single-dimensional rotating accommodation space to a two-dimensional system involving both rotating and non-rotating spaces. The wire harness routing spans across the rotational boundary, utilizing space in both the rotating first accommodation portion and the stationary second accommodation portion, effectively adding a spatial dimension to the accommodation strategy.
2Adaptability or versatility
If the rotation angle of the seat is increased to 180 degrees or more, then the seat rotation range is improved, but the excess length of the wire harness increases and cannot be accommodated
Solution Approach 1:
The wire harness accommodation is segmented into two portions: the first accommodation portion that rotates with the seat and the second accommodation portion that remains stationary. This segmentation allows the system to handle large rotation angles by distributing the wire harness across both rotating and non-rotating spaces, preventing excessive wire length from becoming a constraint.
Solution Approach 2:
The base-side fixing portion acts as an intermediary element that connects the rotating first accommodation portion with the stationary second accommodation portion. It anchors the wire harness at the base while allowing the wire to be routed through both rotating and stationary spaces, enabling large seat rotation angles without excessive wire length accumulation.
3Ease of operation
If the first accommodation portion is positioned on the inner side of the rotational path, then wire harness movement is smoother, but the case structure becomes more complex
Solution Approach 1:
The case is segmented into two functional portions with distinct positions: the first accommodation portion positioned on the inner side of the rotational path for smooth wire movement, and the second accommodation portion positioned outside the rotational path for stationary anchoring. This segmentation allows each portion to be optimized for its specific function while together forming a complete accommodation system.
Solution Approach 2:
The solution utilizes spatial positioning in different dimensions relative to the rotational path. The first accommodation portion is positioned inside the rotational path where the wire harness naturally moves, while the second accommodation portion is positioned outside the rotational path. This dimensional arrangement simplifies the overall structure by leveraging the natural rotation geometry rather than adding complex mechanical components.
Data Source
AI summary
A wire harness routing apparatus includes: a wire harness arranged between a base portion provided in a vehicle and a seat that is provided so as to be able to rotate with respect to the base portion; a case that can rotate together with the seat while accommodating the wire harness; and a base-side fixing portion that fixes, to the base portion, an end portion of the wire harness pulled out toward the base portion from the case, and that can rotate relative to the case accompanying rotation of the seat. The case includes a first accommodation portion that is arranged inside of a range of a rotational path on which the base-side fixing portion rotates relative to the case, and a second accommodation portion that is provided bulging from a portion that is different from the range of the rotational path on which the base-side fixing portion rotates.