Arm Power Supply Device Wire Harness Guidance
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Solution Overview
Problem
Existing arm power supply devices for automobiles face issues with arm deformation, wire harness rattling, unstable trajectory, reduced bending resistance, and assembly challenges due to spring member disassembly and increased device size.
Innovation Solution
The arm power supply device features a first arm with an enclosure portion forming a slit for the wire harness, which increases rigidity and prevents width-direction bending, along with a torsion coil spring engagement to prevent spring member disassembly, and a miniaturized base member design to reduce device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wire harness is wired along the protector base without an enclosure portion, then the device structure is simpler, but the wire harness rattles and the trajectory becomes unstable
Solution Approach 1:
The patent merges the wire harness guidance function into the first arm by forming an enclosure portion with a slit directly on the arm structure. This integration eliminates the need for separate guidance components while ensuring stable wire harness trajectory during door operation.
Solution Approach 2:
The enclosure portion with slit acts as a flexible constraint structure that allows the wire harness to move smoothly in the longitudinal direction while preventing lateral displacement. The slit configuration provides guided movement without rigid confinement.
2Volume of moving object
If the first arm lacks an enclosure portion, then the device size is smaller, but the arm deforms in the width direction when the wire harness is pulled
Solution Approach 1:
The enclosure portion is implemented as a localized structural feature on the first arm rather than a complete covering. This local reinforcement provides the necessary rigidity to prevent width-direction deformation while maintaining the overall compact size of the device.
Solution Approach 2:
The first arm is constructed as a composite structure combining the base arm material with the enclosure portion formed from the same or complementary material. This composite design enhances local stiffness and bending resistance without significantly increasing overall device volume.
3Ease of manufacture
If the spring member is assembled to the shaft of the link arm without engagement prevention, then the assembly process is simpler, but the spring member is easily fallen out
Solution Approach 1:
The engagement prevention structure is integrated into the shaft or spring member itself, allowing the component to self-retain without requiring additional external fastening mechanisms. This design maintains assembly simplicity while ensuring reliable retention during operation.
4Object-affected harmful factors
If a protector cover is used to protect the wire harness, then the wire harness is protected, but the protector and base member increase in size
Solution Approach 1:
The protective function is merged into the first arm structure through the formation of the enclosure portion with slit. This integration provides wire harness protection while eliminating the need for separate protector cover components, thereby reducing overall device size.
Solution Approach 2:
The first arm serves multiple functions: it acts as a structural support, a wire harness guide through the enclosure portion, and a protective enclosure. This multi-functionality eliminates the need for dedicated protective covers while maintaining comprehensive protection.
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 enhances the bending resistance of the wire harness, stabilizes its trajectory, prevents rattling, and improves assembly workability while minimizing the device's size and weight.
Implementation Method 1
a link arm is rotatably and axially supported on a plate protector base vertically disposed in the sliding door, the link arm is urged upward by a torsion coil spring (spring member)
Data Source
AI summary
There is employed an arm power supply device in which a first arm is rotatably and axially supported to a base member having one harness fixing portion, a second arm having the other harness fixing portion is rotatably and axially supported on a rotation tip side of the first arm, the first arm includes an enclosure portion forming a slit through which a wire harness is inserted, and the wire harness passes from the base member to the slit and is wired over the second arm. The enclosure portion includes an inclined wall to guide the wire harness derived in a bent shape from the second arm to be in contact with the inner surface.