Offset Swinging Member for Wire Harness Routing
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Solution Overview
Problem
Conventional power feeding structures for sliding structures, such as automobile doors, experience high friction resistance and wear due to the rigidity of the wire harness, leading to decreased operability and durability, with the wire harness bending abnormally and potentially interfering with passengers during door operation.
Innovation Solution
A power feeding structure where the wire harness is routed with a swinging member having a harness holding portion and a turning shaft or bearing offset in the radial direction, allowing the harness to bend smoothly by applying a compression force that reduces friction and wear, enabling smooth door operation and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the corrugated tube of the wire harness has high rigidity to maintain structural stability, then the wire harness can maintain its shape and protect internal wires, but the pressing load applied to the shaft of the swinging member causes great friction resistance during door opening/closing
Solution Approach 1:
The patent introduces a swinging member as an intermediary component between the wire harness and the door structure. This swinging member includes a shaft that rotates during door operation, allowing the wire harness to change its routing dynamically. The swinging member acts as a mediator that absorbs the mechanical stress caused by the rigid corrugated tube, converting the pressing load into rotational motion of the shaft rather than direct friction against fixed bearings.
Solution Approach 2:
The patent transitions from a static wire harness routing to a dynamic system where the swinging member can rotate during door operation. The shaft of the swinging member rotates to different positions depending on the door opening angle, allowing the wire harness to adapt its configuration dynamically. This dynamic adjustment reduces the pressing load on the shaft by distributing the mechanical stress throughout the range of motion rather than concentrating it at fixed points.
2Stability of the object's composition
If the shaft of the swinging member and bearing are rubbed against each other in circumferential direction due to pressing load, then the structural connection is maintained, but great friction resistance is generated causing deterioration of door operability
Solution Approach 1:
The patent changes the operational parameters of the shaft-bearing interface by introducing rotational freedom. Instead of the shaft rotating within a fixed bearing position, the entire swinging member with its shaft rotates to different angular positions during door operation. This parameter change transforms the friction problem from a static circumferential rubbing at fixed points to a dynamic rotation where the contact points change throughout the range of motion, reducing cumulative friction and wear.
3Device complexity
If the wire harness is routed straight from sliding door to vehicle body, then the routing is simple and space is saved, but the wire harness bends abnormally and may interfere with passengers during door operation
Solution Approach 1:
The patent implements a dynamic wire harness routing system using the swinging member. As the door opens and closes, the swinging member rotates to different positions, causing the wire harness to naturally form curved paths rather than straight lines. This dynamic routing adapts to the door position, ensuring the wire harness clears the passenger area during operation while maintaining a relatively simple overall structure compared to fixed multi-path routing.
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
The solution reduces friction and wear, allowing for easier door operation with reduced motor size and cost, enhanced wire harness durability, and prevents the wire harness from projecting into the passenger area, improving safety and visual quality.
Implementation Method 1
the shaft of the swinging member and each bearing of the fixing member engaged with each of the shafts are rubbed against each other in a circumferential direction, causing great friction resistance
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An object of the present invention is to smoothly turn a swinging member such as a sliding structure-side swinging member even if a pressing load in an axial direction of a wire harness acts midway through opening/closing operation of the sliding structure. To achieve the above object, a wire harness (2) is routed in a harness supporting member (17) on a side of a fixing structure (19) from a swinging member (1, 1') at a sliding structure (16) side, the swinging member (1, 1') includes a harness holding portion (4) in a lateral direction for holding one end (3a) of the wire harness (2), and a turning shaft (5) or a turning bearing in a vertical direction which is offset from the harness holding portion (4) in a radial direction of the harness holding portion (4), the shaft (5) or the bearing is located closer to one of the sliding structure (16) and the fixing structure (19) than the harness holding portion (4) when the sliding structure (16) is fully opened, and the harness holding portion (4) is located closer to the one of the sliding structure (16) and the fixing structure (19) than the shaft (5) or the bearing when the sliding structure (16) is fully closed.